Your browser doesn't support javascript.
Show: 20 | 50 | 100
Results 1 - 20 de 1.792
Braz. j. biol ; 83: e247190, 2023. graf
Article in English | LILACS, VETINDEX | ID: biblio-1345532


Abstract The present study was aimed to evaluate the antioxidant potential and inhibitory effect ofCannabis sativa and Morus nigra against lipid peroxidation in goat brain and liver homogenates. The formation of free radicals, highly reactive oxygen species (ROS) and reactive nitrogen species (RNS) is a normal metabolic process for cellular signaling and countering the antigens. However, they may cause serious damage if they produced at amplified tolls. In addition, metabolic disorders also serve as sources of these reactive species. Although the issue can be addressed through supplements and other phytochemicals. In this study, two plant species were evaluated for their biological potential by employing a spectrum of antioxidant assays. The antioxidant activity was performed by lipid peroxidation assay. The water extract prepared from leaves of Cannabis sativa and Morus nigra showed significant (P<0.05) inhibition as compared to control i.e., 522.6±0.06 and 659.97±0.03 µg/mL against iron-induced lipid peroxidation in goat brain homogenate while the inhibitions were 273.54±0.04 and 309.18±0.05 µg/mL against nitroprusside induced lipid peroxidation of the brain. The iron and nitroprusside induced lipid peroxidation was also significantly inhibited by leaf extracts of Cannabis sativa and Morus nigra in liver homogenates such as 230.63±0.52 and 326.91±0.01 µg/mL (iron-induced) while 300.47±0.07 and 300.47±0.07 µg/mL (nitroprusside induced), respectively. The extracts of Cannabis sativa extract showed promising activity (96.04±0.060%) against DPPH radicals while Morus nigra showed a moderate activity (34.11±0.120%). The results suggest that different accessions ofCannabis sativa and Morus nigra are a potential source of antioxidants and have a therapeutic effect against disease induced by oxidative stress and hence can be used for novel drug discovery and development.

Resumo O presente estudo teve como objetivo avaliar o potencial antioxidante e o efeito inibitório de Cannabis sativa e Morus nigra contra a peroxidação lipídica em homogenatos de cérebro e fígado de cabras. A formação de radicais livres, espécies altamente reativas de oxigênio (ROS) e espécies reativas de nitrogênio (RNS), é um processo metabólico normal para sinalização celular e combate aos antígenos. No entanto, eles podem causar sérios danos se forem produzidos em portagens ampliadas. Além disso, distúrbios metabólicos também servem como fontes dessas espécies reativas, embora o problema possa ser resolvido por meio de suplementos e outros fitoquímicos. Neste estudo, duas espécies de plantas foram avaliadas quanto ao seu potencial biológico, empregando um espectro de ensaios antioxidantes. A atividade antioxidante foi realizada por ensaio de peroxidação lipídica. O extrato de água preparado a partir de folhas de Cannabis sativa e Morus nigra mostrou inibição significativa (P < 0,05) em comparação com o controle, ou seja, 522,6 ± 0,06 e 659,97 ± 0,03 µg / mL contra peroxidação lipídica induzida por ferro em homogenato de cérebro de cabra, enquanto as inibições foram 273,54 ± 0,04 e 309,18 ± 0,05 µg / mL contra a peroxidação lipídica do cérebro induzida por nitroprussiato. A peroxidação lipídica induzida por ferro e nitroprussiato também foi significativamente inibida por extratos de folhas de Cannabis sativa e Morus nigra em homogenatos de fígado, como 230,63 ± 0,52 e 326,91 ± 0,01 µg / mL (induzida por ferro), enquanto 300,47 ± 0,07 e 300,47 ± 0,07 µg / mL (induzida por nitroprussiato), respectivamente. Os extratos do extrato de Cannabis sativa apresentaram atividade promissora (96,04 ± 0,060%) contra os radicais DPPH enquanto Morus nigra apresentou atividade moderada (34,11 ± 0,120%). Os resultados sugerem que diferentes acessos de Cannabis sativa e Morus nigra são uma fonte potencial de antioxidantes e têm efeito terapêutico contra doenças induzidas por estresse oxidativo e, portanto, podem ser usados ​​para a descoberta e desenvolvimento de novos medicamentos.

Animals , Cannabis , Morus , Brain , Goats , Plant Extracts/pharmacology , Lipid Peroxidation , Liver , Antioxidants/metabolism , Antioxidants/pharmacology
Braz. J. Vet. Res. Anim. Sci. (Online) ; 59: e188941, fev. 2022. ilus
Article in English | LILACS, VETINDEX | ID: biblio-1380208


Canine Distemper is a disease caused by Canine morbillivirus (CM), a pantropic virus that can affect the central nervous system (CNS), causing demyelination. However, the pathogenesis of this lesion remains to be clarified. Brain samples of 14 naturally infected dogs by CM were analyzed to evaluate the presence of oxidative stress and demyelination. RT-PCR assay was performed to confirm a diagnosis of canine distemper in the brain, immunohistochemistry anti-CM was used to localize the viral proteins in the tissue, and anti-4-hydroxy-2-nonenal (4-HNE) was a marker of a product of lipid peroxidation. The results showed the presence of viral proteins in the demyelinated area with the presence of 4-HNE. Our results suggest that the CM virus infection causes oxidative stress leading to lipid peroxidation, which causes tissue damage and demyelination. In conclusion, oxidative stress plays a significant role in canine distemper pathogenesis in the CNS.(AU)

A cinomose canina é uma doença causada pelo Morbilivírus canino (CM), um vírus pantrópico que pode afetar o sistema nervoso central (SNC), causando desmielinização. No entanto, a patogênese dessa lesão não está totalmente esclarecida. RT-PCR e imuno-histoquímica foram realizadas para confirmação do diagnóstico de cinomose em amostras de encéfalo de 14 cães naturalmente infectados. Após confirmação, foi realizada uma avaliação do estresse oxidativo por imuno-histoquímica com uso de anti-4-hidroxi-nonenal (4HNE) como marcador de produtos resultantes da peroxidação lipídica. Os resultados sugerem que a infecção pelo CM causa estresse oxidativo no tecido, levando a peroxidação lipídica, a qual causa danos ao tecido, culminando com desmielinização. Conclui-se que o estresse oxidativo tem papel importante na patogênese da cinomose canina no sistema nervoso central.(AU)

Animals , Biomarkers/metabolism , Central Nervous System Infections/veterinary , Distemper/diagnosis , Dogs/virology , Immunohistochemistry/instrumentation , Lipid Peroxidation/drug effects , Demyelinating Diseases/veterinary , Morbillivirus/pathogenicity , Oxidative Stress/physiology , Reverse Transcriptase Polymerase Chain Reaction/instrumentation , Cerebrum/virology
Acta sci., Health sci ; 44: e58558, Jan. 14, 2022.
Article in English | LILACS | ID: biblio-1367771


Cardiovascular disease(CVD) remains the major cause of mortality in the world, typically claiming a third of all deaths. The primary cause of CVD is atherosclerosis. Therefore, timely prevention and therapy of atherosclerosis are able to reduce the risk of the development of its clinical manifestations. Anti-atherosclerotic activity of medicinal plants mainly appears in their multiple effects.This study was carried out to evaluate the hypolipidemic activity of virgin olive oil in experimentally induced hyperlipemic Wistar. A total of 24 rats were randomly allocated to 4 equal groups and treated as follows for 50 days: (1) Normal control (NC); that were fed with a standart diet; (2) High Cholesterol Diet Control (HCD); which received high cholesterol diet for 50 days; (3) Animals receiving high cholesterol diet for 50 days, after this period the animals are fed for eight days by the standard foodand receiving by gavage virgin olive oil (HCD+VOO) and(4) Animals fed for eight days with the standard food and receiving by gavage olive oil (VOO). High Cholesterol Diet containing yolk egg and coconut oil. Results showed that olive oil caused a significant (p < 0.01) reduction in serum levels of Total Cholesterol (TC), Triglycerides (TG), Low­Density Lipoprotein Cholesterol (LDL) and Atherogenic Index Serum (AIS). The results also demonstrated a significant (p < 0.01) increase in High­Density Lipoprotein Cholesterol (HDL). Moreover, virgin olive oil induced a significant reduction in liver lipid content. On the other hand, a High cholesterol diet induced oxidative stress was measured by estimating reduced glutathione level and amount of thiobarbituric acid reactive substances (TBARS) formed as an index of lipid peroxidation in a liver and a heart. Virgin olive oil supplementation attenuated all these variations. Our observations of the study indicate that the virgin olive oil has a significant antihyperlipidemic potential.

Animals , Rats , Oxidative Stress/immunology , Atherosclerosis/diet therapy , Diet, High-Fat/methods , Olive Oil/pharmacology , Triglycerides/pharmacology , Lipid Peroxidation/immunology , Cholesterol/pharmacology , Rats, Wistar/immunology , Diet, Atherogenic/methods , Glutathione/pharmacology , Hypercholesterolemia/immunology , Lipoproteins/immunology
Journal of Integrative Medicine ; (12): 396-401, 2022.
Article in English | WPRIM | ID: wpr-939904


The testis is an immune-privileged organ susceptible to oxidative stress and inflammation, two major factors implicated in male infertility. A reduction in the concentration and activities of testicular function biomarkers has been shown to correlate with impaired hypothalamic-pituitary-testicular axis and oxidative stress. However, the use of natural products to ameliorate these oxidative stress-induced changes may be essential to improving male reproductive function. Quercetin possesses several pharmacological activities that may help to combat cellular reproduction-related assaults, such as altered sperm function and reproductive hormone dysfunction, and dysregulated testicular apoptosis, oxidative stress, and inflammation. Studies have shown that quercetin ameliorates testicular toxicity, largely by inhibiting the generation of reactive oxygen species, with the aid of the two antioxidant pharmacophores present in its ring structure. The radical-scavenging property of quercetin may alter signal transduction of oxidative stress-induced apoptosis, prevent inflammation, and increase sperm quality in relation to the hormonal concentration. In this review, the therapeutic potential of quercetin in mediating male reproductive health is discussed.

Antioxidants/pharmacology , Apoptosis , Humans , Inflammation/drug therapy , Lipid Peroxidation , Male , Oxidative Stress , Quercetin/pharmacology , Semen , Testis
Odovtos (En línea) ; 23(3)dic. 2021.
Article in English | LILACS-Express | LILACS, SaludCR | ID: biblio-1386553


ABSTRACT: Despite the reported effects of smokeless tobacco (ST) on the periodontium and high prevalence of ST use in rural populations and in males studies on this specific topic are limited. The purpose of this cross-sectional investigation was to measure lipid peroxidation (as an end product of oxidative stress) end product i.e. Malondialdehyde (MDA) in saliva of patients with gingivitis, chronic periodontitis and to assess the influence of smokeless tobacco on Salivary Malondialdehyde (S-MDA). Total 30 patients with gingivitis, 30 with chronic periodontitis and 30 Smokeless Tobacco Chewers with Chronic Periodontitis and 30 periodontally healthy subjects were included in the study. Plaque Index (PI), Gingival Index (GI), Probing Pocket Depth (PD), and Clinical Attachment Loss (CAL) were recorded followed by stimulated Saliva sample collection. Salivary MDA Levels were assessed by UV Spectrophotometry. There was a statistically significant increase in the salivary MDA levels in gingivitis, chronic periodontitis and in smokeless tobacco chewers with chronic periodontitis when compared with healthy group. Higher salivary MDA levels in gingivitis group, chronic periodontitis, and smokeless tobacco chewers with chronic periodontitis reflects increasedoxygen radical activity during periodontal inflammation.

RESUMEN: A pesar de los efectos reportados del tabaco sin humo (TS) sobre el periodonto y la alta prevalencia del uso de TS en poblaciones rurales y en hombres, los estudios sobre este tema específico son limitados. El propósito de esta investigación transversal fue medir el producto final de la peroxidación lipídica (como producto final del estrés oxidativo), es decir, malondialdehído (MDA) en la saliva de pacientes con gingivitis, periodontitis crónica y evaluar la influencia del tabaco sin humo en el malondialdehído salival (S-MDA). Se incluyeron en el estudio un total de 30 pacientes con gingivitis, 30 con periodontitis crónica y 30 masticadores de tabaco sin humo con periodontitis crónica y 30 sujetos periodontalmente sanos. Se registraron el índice de placa (PI), el índice gingival (GI), la profundidad de la bolsa de sondeo (PD) y la pérdida de adherencia clínica (CAL), seguidos de la recogida de muestras de saliva estimuladas. Los niveles de MDA en saliva se evaluaron mediante espectrofotometría UV. Hubo un aumento estadísticamente significativo en los niveles de MDA en saliva en gingivitis, periodontitis crónica y en masticadores de tabaco sin humo con periodontitis crónica en comparación con el grupo sano. Los niveles más altos de MDA en saliva en el grupo de gingivitis, periodontitis crónica y masticadores de tabaco sin humo con periodontitis crónica reflejan un aumento de la actividad de los radicales de oxígeno durante la inflamación periodontal.

Humans , Chronic Periodontitis/chemically induced , Tobacco Use , Lipid Peroxidation , Malondialdehyde/analysis
Electron. j. biotechnol ; 52: 13-20, July. 2021. tab, graf, ilus
Article in English | LILACS | ID: biblio-1283173


BACKGROUND: In fish farming, the plant extracts containing antioxidant compounds have been added to the diet for enhancing pathogen resistance. In vitro studies evaluating the antioxidant effect of herbal extracts on fish cell models have focused on ROS production and the respiratory burst mechanism. However, the effects on enzymatic antioxidant defense on salmon leukocytes have not been evaluated. This study aims to evaluate the enzymatic antioxidant defense and ROS-induced cell damage in Salmon Head Kidney-1 (SHK-1) cell line exposed to polyphenol-enriched extract from Sambucus nigra flowers. RESULTS: Firstly, the Total Reactive Antioxidant Power (TRAP) assay of elderflower polyphenol (EP) was evaluated, showing 459 and 489 times more active than gallic acid and butyl hydroxy toluene (BHT), respectively. The toxic effect of EP on salmon cells was not significant at concentrations below 120 mg/ mL and no hemolysis activity was observed between 20 and 400 mg/mL. The treatment of SHK-1 cell line with EP decreased both the lipid peroxidation and protein oxidation induced by H2O2, which could be associated with decreasing oxidative stress in the SHK-1 cells since the GSH/GSSG ratio increased when only EP was added. CONCLUSIONS: These results suggest that plant extracts enriched with polyphenols could improve the enzymatic antioxidant defense of salmon leukocytes and protect the cells against ROS-induced cell damage

Salmon , Plant Extracts/pharmacology , Sambucus nigra/chemistry , Polyphenols/pharmacology , Lipid Peroxidation , Free Radical Scavengers , Reactive Oxygen Species , Aquaculture , Oxidative Stress , Salmo salar , Disease Resistance , Leukocytes , Antioxidants
Motriz (Online) ; 27: e1021021420, 2021. tab
Article in English | LILACS | ID: biblio-1154892


Abstract Aim: The present study aimed to verify the cardiac oxidative stress biomarker responses to high-intensity interval training (HIIT) in rats. Methods: Sixteen male Wistar rats weighing 250 to 300 g were equally divided into two groups (8 animals/group): sedentary control (SC) and trained group (HIIT). The exercise protocol consisted of high-intensity swimming (14% of body weight, 20 s of activity with 10 s of pause performed 14 times) which was performed for 12 consecutive days. Results: The cardiac tissue concentrations of malondialdehyde and carbonylated proteins showed no significant changes; on the other hand, hydroperoxide levels were higher in the HIIT group than in the SC group. The activities of superoxide dismutase, catalase, and glutathione peroxidase enzymes and the levels of reduced glutathione and sulfhydryl remained unchanged. Conclusion: It is possible to conclude that short-term high-intensity interval training induces changes in the cardiac oxidative stress biomarker but with no effect on the antioxidant enzymes.

Animals , Rats , Lipid Peroxidation , Oxidative Stress , High-Intensity Interval Training/methods , Heart Rate , Swimming , Rats, Wistar
Article in Chinese | WPRIM | ID: wpr-942305


OBJECTIVE@#To investigate evodiamine (EVO)-induced hepatotoxicity and the underlying mechanism.@*METHODS@#HepG2 cells were treated with EVO (0.04-25 μmol/L) for different time intervals, and the cell survival rate was examined by cell counting kit-8 (CCK-8) method. After HepG2 cells were treated with EVO (0.2, 1 and 5 μmol/L) for 48 h, the alanine transaminase (ALT), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), alkaline phosphatase (ALP) activities and total bilirubin (TBIL) content of supernatant were detected. A multifunctional microplate reader was used to detect the intracellular superoxide dismutase (SOD) activity and malondialdehyde (MDA) content in HepG2 cells to evaluate the level of cell lipid peroxidation damage. The interactions between EVO and apoptosis, autophagy or ferroptosis-associated proteins were simulated by molecular docking. The HepG2 cells were stained by mitochondrial membrane potential (MMP) fluorescent probe (JC-10) and annexin V-fluorescein isothiocyanate/propidium iodide (Annexin V-FITC/PI), and MMP and apoptosis in HepG2 cells were detected by flow cytometry. The protein expression levels of caspase-9, caspase-3, bile salt export pump (BSEP) and multidrug resistance-associated protein 2 (MRP2) were detected by Western blot.@*RESULTS@#The cell survival rate was significantly reduced after the HepG2 cells were exposed to EVO (0.04-25 μmol/L) in a time- and dose-dependent manner. The half maximal inhibitory concentration (IC50) of the HepG2 cells treated with EVO for 24, 48 and 72 h were 85.3, 6.6 and 4.7 μmol/L, respectively. After exposure to EVO (0.2, 1 and 5 μmol/L) for 48 h, the ALT, AST, LDH, ALP activities and TBIL content in the HepG2 cell culture supernatant, and the MDA content in the cells were increased, and SOD enzyme activity was decreased. Molecular docking results showed that EVO interacted with apoptosis-associated proteins (caspase-9 and caspase-3) better. JC-10 and Annexin V-FITC/PI staining assays demonstrated that EVO could decrease MMP and promote apoptosis in the HepG2 cells. Western blot results indicated that the protein expressions of cleaved caspase-9 and cleaved caspase-3 were upregulated in the HepG2 cell treated with EVO for 48 h. In contrast, the protein expressions of pro-caspase-3, BSEP and MRP2 were downregulated.@*CONCLUSION@#These results suggested that 0.2, 1 and 5 μmol/L EVO had the potential hepatotoxicity, and the possible mechanism involved lipid peroxidation damage, cell apoptosis, and cholestasis.

ATP Binding Cassette Transporter, Subfamily B, Member 11 , Apoptosis , Caspase 3 , Caspase 9 , Cholestasis , Hep G2 Cells/drug effects , Humans , Lipid Peroxidation , Liver/drug effects , Molecular Docking Simulation , Multidrug Resistance-Associated Protein 2 , Quinazolines/toxicity
Electron. j. biotechnol ; 45: 46-52, May 15, 2020. tab, graf, ilus
Article in English | LILACS | ID: biblio-1177424


BACKGROUND: The present study analyzed the synergistic protective effect of ß-alanine and taurine against myocardial ischemia/reperfusion. Myocardial infarct size, lipid peroxidation, and levels of glutathione peroxidase (Gpx), superoxide dismutase (SOD), reduced glutathione (GSH), catalase, tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), reactive oxygen species (ROS), apoptosis, and the mRNA and protein expression of Janus kinase 2 (JAK2) and signal transducer and activator 3 of transcription (STAT3) were determined. The molecular docking was carried out by using AutoDock 4.2.1. RESULTS: Combined treatment with ß-alanine and taurine reduced myocardial infarct size, lipid peroxidation, inflammatory marker, ROS levels, and apoptosis and increased Gpx, SOD activity, GSH, and catalase activity. Furthermore, combined treatment significantly reduced JAK2 and STAT3 mRNA and protein expression compared with the control. The small molecule was docked over the SH2 domain of a STAT3, and binding mode was determined to investigate the inhibitory potential of ß-alanine and taurine. ß-Alanine bound to SH2 domain with ΔG of -7.34 kcal/mol and KI of 1.91 µM. Taurine bound to SH2 domain with ΔG of -7.38 kcal/mol and KI of 1.95 µM. CONCLUSION: Taken together, these results suggest that the combined supplementation of ß-alanine and taurine should be further investigated as an effective therapeutic approach in achieving cardioprotection in myocardial ischemia/reperfusion.

Animals , Male , Rats , Taurine/therapeutic use , Cardiotonic Agents/therapeutic use , Reperfusion Injury/drug therapy , beta-Alanine/therapeutic use , Myocardial Ischemia/drug therapy , Superoxide Dismutase , Immunohistochemistry , Lipid Peroxidation , Reactive Oxygen Species , Rats, Wistar , Reverse Transcriptase Polymerase Chain Reaction , Disease Models, Animal , Janus Kinase 2 , Molecular Docking Simulation , Glutathione Peroxidase , Heart Diseases/drug therapy , Inflammation
Acta cir. bras ; 35(11): e351106, 2020. tab, graf
Article in English | LILACS | ID: biblio-1141941


Abstract Purpose To evaluate renal histological changes by stereology and morphometry and analyze the main markers of oxidative stress in rats undergoing natural aging. Methods Seventy two Wistar rats were divided into six groups of 12 rats each, which were euthanized at 3, 6, 9, 12, 18, and 24 months of age. Right kidney was stereologically and morphometrically analyzed to calculate the volumetric density (Vv[glom]), numerical density (Nv[glom]) and glomerular volume (Vol[glom]). Left kidney was used to determine the levels of nonprotein thiols, lipid peroxidation, and protein carbonylation, as well as the activities of superoxide-dismutase and catalase enzymes. Results Both Vv[glom] and Nv[glom] values showed gradual decreases between groups. Activity of superoxide-dismutase was elevated at 24 months of age, and the levels of nonprotein thiols were higher in older animals. Greater catalase activity and protein carbonylation were observed in animals between 6 and 12 months of age but lessened in older rats. Lipid peroxidation decreased in the older groups. Conclusions Morphometric and stereological analyses revealed a gradual decrease in the volume and density of renal glomeruli during aging, as well as kidney atrophy. These findings related to oxidative stress clarify many changes occurring in kidney tissues during senescence in rats.

Animals , Rats , Catalase/metabolism , Superoxide Dismutase/metabolism , Aging , Lipid Peroxidation , Rats, Wistar , Oxidative Stress , Kidney/metabolism , Kidney Diseases
Rev. Nutr. (Online) ; 33: e190097, 2020. tab, graf
Article in English | LILACS | ID: biblio-1101407


ABSTRACT Objective The purpose of this study is to determine the phenolic and flavonoid contents, and antioxidant activities and neuroprotective effects of powdered coffee sample of a commercial coffee brand originated from Sivas, Turkey. Methods Total phenolic, flavonoid and antioxidant contents, enzymatic and non-enzymatic antioxidative activities based on 2,2-diphenyl-1-picrylhydrazyl free radical scavenging activity, metal chelating potential, reducing power, superoxide dismutase and catalase activity tests and lipid peroxidation inhibition potentials of the ethanolic and aqueous extracts of the coffee sample were assayed using the commonly preferred spectrophotometric methods. Furthermore the extracts' cholinesterase and tyrosinase inhibition potentials were evaluated. Phenolic profiles of the coffee sample were investigated using high performance liquid chromatography. Results Catechin was the most frequently detected phenolic acid. In addition, it was demonstrated that the water extract has a significant impact when compared with standard antioxidants. While the SC50 (sufficient concentration to obtain 50% of a maximum scavenging capacity) value for the scavenging activity of 2,2-diphenyl-1-picrylhydrazyl free radical was calculated as being 0.08mg/mL for water extract, the amount of chelating agents with half Fe2+ ions in the medium was found to be 0.271mg/mL. Additionally, it was shown that 0.1mg/mL concentration of both extracts prevents lipid peroxidation by 8%. Compared with standard drugs, inhibition potentials of cholinesterase and tyrosinase enzymes were considered as moderately acceptable in these samples. Conclusion Besides the extracts' enzymatic antioxidant activity, their inhibition potential on cholinesterase and tyrosinase enzymes - which are important clinical enzymes - reveal that this natural source can be used as a valuable resource in different fields, especially in medicine.

RESUMO Objetivo O objetivo deste estudo é determinar o conteúdo fenólico e flavonoide, bem como as atividades antioxidantes e os efeitos neuroprotetores de uma amostra de café em pó de uma promissora marca comercial proveniente de Sivas, Turquia. Métodos A partir dos métodos espectrofotométricos comumente utilizados, foram analisados os seguintes aspectos da amostra de café: teores de fenólicos totais, flavonoides e antioxidantes; atividades antioxidantes enzimáticas e não enzimáticas, baseadas na atividade de eliminação de radicais livres de 2,2-difenil-1-picrilhidrazila potencial quelante de metais; poder redutor; testes de atividade de superóxido dismutase e catalase; e potenciais de inibição da peroxidação lipídica dos extratos etanólicos e aquosos. Além disso, foram avaliados os potenciais de inibição da colinesterase e da tirosinase dos extratos. Os perfis fenólicos da amostra de café foram investigados por cromatografia líquida de alta eficiência. Resultados Entre os ácidos fenólicos estudados, o mais detectado foi a catequina. Especialmente, foi demonstrado que o extrato de água tem um impacto significativo quando comparado com os antioxidantes padrão. Determinou--se que o valor de SC50 (a concentração suficiente para obter 50% da capacidade máxima de eliminação) da atividade de eliminação do radical 2,2-difenil-1-picrilhidrazilab/para extrato de água era de 0,08mg/mL, enquanto a quantidade de agentes quelantes com metade de Fe2+ íons na média foi encontrada como 0,271mg/mL. Também foi demonstrado que a concentração de 0,1mg/mL de ambos os extratos inibe a peroxidação lipídica em cerca de 8%. Comparado com drogas padrão, os potenciais de inibição das amostras nas enzimas e tirosinase foram aceitáveis como moderados. Conclusão Os resultados mostram que, além de terem atividade antioxidante enzimática, os extratos apresentam potencial de inibição das enzimas colinesterase e tirosinase, que são importantes enzimas clínicas, o que revela que essa fonte natural pode ser usada como um recurso valioso em vários campos, principalmente na medicina.

Cholinesterase Inhibitors , Lipid Peroxidation , Monophenol Monooxygenase , Coffee , Phenolic Compounds , Free Radicals , Antioxidants
Acta Physiologica Sinica ; (6): 566-574, 2020.
Article in Chinese | WPRIM | ID: wpr-878202


Ferroptosis is a newly discovered non-apoptotic form of regulated cell death driven by iron-dependent lipid peroxidation. The present studies have shown that many metabolic processes and homeostasis are affected by ferroptosis. It is related to many lung diseases, including acute lung injury, chronic obstructive pulmonary disease and pulmonary fibrosis, etc. Currently, the research on ferroptosis is still in its infancy. Previous studies have confirmed that ferroptosis is regulated by a variety of genes, and the mechanism is complex, mainly involving iron homeostasis and lipid peroxidation metabolism. This review summarizes some regulation networks of metabolic processes associated with ferroptosis and discusses the roles of ferroptosis in the pathophysiological progression of many lung diseases. We expected to provide new ideas and references for the treatment of these diseases.

Ferroptosis , Humans , Iron , Lipid Peroxidation , Metabolic Networks and Pathways , Pulmonary Disease, Chronic Obstructive
Braz. j. med. biol. res ; 53(6): e9237, 2020. tab, graf
Article in English | LILACS, ColecionaSUS | ID: biblio-1132520


We investigated changes in oxidative biomarkers in brain regions such as brainstem, cerebellum, and cerebral cortex of 3-, 6-, 18-, 24-, and 30-month-old rats. We also assessed the effects of low-intensity exercise on these biomarkers in these regions of 6-, 18-, and 24-month-old rats that started exercise on a treadmill at 3, 15, and 21 months of age, respectively. Radiographic images of the femur were taken for all rats. A total of 25 rats (age: twelve 6-, ten 18-, ten 24-, and three 30-month-old rats) were used. Lipid hydroperoxide levels increased in cerebellum at 18 months. Total antioxidant activity exhibited lowest values in brainstem at 3 months. Superoxide dismutase activity did not exhibit significant changes during aging. Total thiol content exhibited lowest values in brain regions of 24- and 30-month-old rats. Exercise reduced total thiol content in brainstem at 6 months, but no change occurred in other regions and other ages. Femur increased its length and width and cortical thickness with advancing age. No change occurred in medullary width. Radiolucency increased and sclerosis was found in cortical and medullary bone with advancing age. Exercise reduced radiolucency and medullary sclerosis. Therefore, aging differentially changed oxidative biomarkers in different brain regions and radiographic measures of the femur. Low-intensity exercise only ameliorated some radiographic measurements of femur. Since the present study possessed limitations (small number of rats per group), a beneficial effect of regular low-intensity exercise on oxidative markers in brain cannot be ruled out.

Animals , Male , Rats , Physical Conditioning, Animal/physiology , Brain/metabolism , Aging/physiology , Oxidative Stress/physiology , Femur/diagnostic imaging , Lipid Peroxides/analysis , Oxidation-Reduction , Aging/metabolism , Biomarkers/analysis , Lipid Peroxidation , Rats, Wistar , Femur/chemistry
Rev. cuba. obstet. ginecol ; 45(4): e496, oct.-dic. 2019. tab, graf
Article in Spanish | LILACS, CUMED | ID: biblio-1126710


RESUMEN Introducción: La preeclampsia es uno de los síndromes en mujeres embarazadas que afecta al menos 3 - 8 por ciento de todos los embarazos. Objetivo: Desarrollar un modelo predictivo de preeclampsia a partir del estado redox en embarazadas, que clasifique a las mujeres pertenecientes a los grupos de gestantes preeclámpticas y gestantes sanas. Métodos: Se realizó un estudio analítico transversal. Los parámetros bioquímicos y clínicos se evaluaron utilizando el análisis de componentes principales para identificar las variables más influyentes en la aparición de preeclampsia. Los seleccionados como las variables más importantes fueron evaluados por el análisis discriminante lineal de Fisher. Resultados: El análisis de componentes principales determinó la varianza del set de datos, mostrando la relación con los procesos de peroxidación lipídica, metabolismo de proteínas, daño a tejidos y microangiopático, considerados factores en la fisiopatología de la preeclampsia. Las variables más influyentes fueron usadas para modelar una función discriminante capaz de clasificar gestantes sanas y preeclámpticas. El valor de Lambda de Wilks y el alto autovalor asociado a la función discriminante muestran el poder discriminante del modelo. La ecuación obtenida fue validada con el método Leave one out y reveló un excelente poder clasificatorio del mismo. Conclusiones: El modelo predictivo puede ser considerado como apropiado para clasificar los casos de preeclampsia, y muestran a los biomarcadores como buenos candidatos para la clasificación y como potenciales indicadores predictivos de preeclampsia(AU)

ABSTRACT Introduction: Preeclampsia is one of the syndromes in pregnant women that affects at least 3 - 8 percent of all pregnancies. Objective: To develop a predictive model of preeclampsia from the redox state in pregnant women, which allows to classify them in groups of preeclamptic pregnant women and healthy pregnant women. Methods: A cross-sectional analytical study was performed. Biochemical and clinical parameters were evaluated using principal component analysis to identify the most influential variables in the occurrence of preeclampsia. Those selected as the most important variables were evaluated by Fisher's linear discriminant analysis. Results: The main component analysis determined the variance of the data set, showing the relationship with lipid peroxidation processes, protein metabolism, tissue damage and microangiopathy, considered factors in the pathophysiology of preeclampsia. The most influential variables were used to model a discriminant function capable of classifying healthy and preeclamptic pregnant women. Wilks Lambda value and the high eigenvalue associated with the discriminant function show the discriminant power of the model. The equation obtained was validated with the Leave one out method and revealed excellent classifying power. Conclusions: The predictive model can be considered as appropriate to classify pre-eclampsia cases, and to show biomarkers as good candidates for classification and as potential predictive indicators of pre-eclampsia(AU)

Humans , Female , Pregnancy , Pre-Eclampsia/diagnosis , Discriminant Analysis , Lipid Peroxidation , Cross-Sectional Studies
Arq. neuropsiquiatr ; 77(12): 881-887, Dec. 2019. tab, graf
Article in English | LILACS | ID: biblio-1055207


ABSTRACT Induction of long-term potentiation (LTP) increases the storage capacity of synapses in the hippocampal dentate gyrus (DG). Irisin is a myokine generated from FNDC5 (a gene precursor) during exercise. Although intra-cornu ammonis 1 administration of irisin fortifies LTP in mice with Alzheimer's disease, the effects of intra-DG injection of irisin on the LTP in rats remains to be elucidated in vivo. In this study, male Wistar rats were randomly divided into a control group (saline), irisin (0.5, 1, and 1.5 μg/rat), and dimethyl sulfoxide (DMSO). After treatment, the population spike (PS) amplitude and slope of excitatory postsynaptic potentials (EPSP) were measured in the DG of rats in vivo. Moreover, following completion of the experiments, the stimulating and recording sites in the hippocampus were confirmed histologically from brain sections. Furthermore, biochemical assays like malondialdehyde (MDA), total antioxidant capacity (TAC), and total oxidant status (TOS) were evaluated (the antioxidant markers were analyzed in the plasma). Our results suggest that all doses of irisin (0.5, 1, 1.5 μg/rat) caused an increase in the EPSP slope and PS amplitude when compared with the control group. In addition, the results obtained showed that irisin decreased TOS and MDA levels while increasing TAC levels as a marker of lipid peroxidation in plasma. The present report provides direct evidence that irisin affects the activity-dependent synaptic plasticity in the dentate gyrus.

RESUMO A indução de potenciação de longo prazo (LTP) aumenta a capacidade de armazenamento das sinapses no giro denteado (DG) do hipocampo. A irisina é uma miocina gerada a partir do FNDC5 (um precursor genético) durante o exercício. Embora a administração intra-Cornu Ammonis1 de irisina fortaleça a LTP em camundongos com doença de Alzheimer, os efeitos da injeção intra-denteada de irisina sobre a LTP em ratos ainda precisam ser elucidados in vivo. Neste estudo, ratos Wistar machos foram divididos aleatoriamente em um grupo controle (solução salina), irisina (0,5, 1 e 1,5 μg / rato) e dimetilsulfóxido (DMSO). Após o tratamento, a amplitude do pico populacional (PS) e a variação dos potenciais pós-sinápticos excitatórios (EPSP) foram medidos no DG de ratos in vivo. Além disso, após a conclusão das experiências, os locais de estimulação e registro no hipocampo foram confirmados histologicamente a partir de secções do cérebro. Adicionalmente, ensaios bioquímicos como malondialdeído (MDA), capacidade antioxidante total (TAC) e status oxidante total (TOS) foram avaliados (os marcadores antioxidantes foram analisados no plasma). Nossos resultados sugerem que todas as doses de irisina (0,5, 1, 1,5 μg / rato) causaram um aumento na variação da EPSP e na amplitude da PS quando comparadas com o grupo controle. Além disso, os resultados obtidos mostraram que a irisina diminuiu os níveis de TOS e MDA, enquanto aumentou os níveis de TAC como um marcador da peroxidação lipídica no plasma. O presente estudo fornece evidências diretas de que a irisina afeta a plasticidade sináptica dependente de atividade no DG.

Animals , Male , Neuropeptides/administration & dosage , Fibronectins/administration & dosage , Long-Term Potentiation/drug effects , Dentate Gyrus/drug effects , Microinjections/methods , Reference Values , Time Factors , Lipid Peroxidation , Random Allocation , Reproducibility of Results , Rats, Wistar , Brain-Derived Neurotrophic Factor/analysis , Brain-Derived Neurotrophic Factor/drug effects , Excitatory Postsynaptic Potentials/drug effects , Malondialdehyde/blood , Antioxidants/analysis
Arq. bras. cardiol ; 113(5): 905-912, Nov. 2019. tab, graf
Article in English | LILACS | ID: biblio-1055041


Abstract Background: Arterial hypertension is a precursor to the development of heart and renal failure, furthermore is associated with elevated oxidative markers. Environmental enrichment of rodents increases performance in memory tasks, also appears to exert an antioxidant effect in the hippocampus of normotensive rats. Objectives: Evaluate the effect of environmental enrichment on oxidative stress in the ventrolateral medulla, heart, and kidneys of renovascular hypertensive rats. Methods: Forty male Fischer rats (6 weeks old) were divided into four groups: normotensive standard condition (Sham-St), normotensive enriched environment (Sham-EE), hypertensive standard condition (2K1C-St), and hypertensive enriched environment (2K1C-EE). Animals were kept in enriched or standard cages for four weeks after all animals were euthanized. The level of significance was at p < 0.05. Results: 2K1C-St group presented higher mean arterial pressure (mmHg) 147.0 (122.0; 187.0) compared to Sham-St 101.0 (94.0; 109.0) and Sham-EE 106.0 (90.8; 117.8). Ventrolateral medulla from 2K1C-EE had higher superoxide dismutase (SOD) (49.1 ± 7.9 U/mg ptn) and catalase activity (0.8 ± 0.4 U/mg ptn) compared to SOD (24.1 ± 9.8 U/mg ptn) and catalase activity (0.3 ± 0.1 U/mg ptn) in 2K1C-St. 2K1C-EE presented lower lipid oxidation (0.39 ± 0.06 nmol/mg ptn) than 2K1C-St (0.53 ± 0.22 nmol/mg ptn) in ventrolateral medulla. Furthermore, the kidneys of 2K1C-EE (11.9 ± 2.3 U/mg ptn) animals presented higher superoxide-dismutase activity than those of 2K1C-St animals (9.1 ± 2.3 U/mg ptn). Conclusion: Environmental enrichment induced an antioxidant effect in the ventrolateral medulla and kidneys that contributes to reducing oxidative damage among hypertensive rats.

Resumo Fundamento: A hipertensão arterial é um precursor para o desenvolvimento da insuficiência cardíaca e renal e, além disso, está associada com o aumento dos marcadores oxidativos. O enriquecimento ambiental dos roedores melhora o desempenho em tarefas de memória, e também parece ter um efeito antioxidante sobre o hipocampo dos ratos normotensos. Objetivos: Avaliar o efeito do enriquecimento ambiental sobre o estresse oxidativo no bulbo ventrolateral, coração, e rins de ratos com hipertensão renovascular. Métodos: Quarenta ratos machos, tipo Fischer (6 semanas de idade), foram divididos em quatro grupos: normotensos em condições padrão (Sham-CP), normotensos em ambiente enriquecido (Sham-AE), hipertensos em condições padrão (2R1C-CP), e hipertensos em ambiente enriquecido (2R1C-AE). Os animais foram mantidos em gaiolas enriquecidas ou padrão durante quatro semanas e, por fim, todos os animais foram eutanasiados. O nível de significância foi p < 0,05. Resultados: O grupo 2R1C-CP apresentou pressão arterial média maior (mmHg) 147,0 (122,0; 187,0) quando comparado com os grupos Sham-CP 101,0 (94,0; 109,0) e Sham-AE 106,0 (90,8; 117,8). Observou-se maior atividade das enzimas superóxido dismutase (SOD) (49,1 ± 7,9 U/mg ptn) e da catalase (0,8 ± 0,4 U/mg ptn) no bulbo ventrolateral do grupo 2R1C-AE, em relação à atividade da SOD (24,1 ± 9,8 U/mg ptn) e da catalase (0,3 ± 0,1 U/mg ptn) no grupo 2R1C-CP. No grupo 2R1C-AE, a oxidação lipídica no bulbo ventrolateral foi menor (0,39 ± 0,06 nmol/mg ptn) quando comparado com o grupo 2R1C-CP (0,53 ± 0,22 nmol/mg ptn). Ademais, foi observada maior atividade das enzimas superóxido dismutase nos rins dos animais 2R1C-AE (11,9 ± 2,3 U/mg ptn) em relação aos animais 2R1C-CP (9,1 ± 2,3 U/mg ptn). Conclusão: O enriquecimento ambiental provocou efeito antioxidante no bulbo ventrolateral e nos rins, o que contribuiu para a redução do dano oxidante nos ratos hipertensos.

Animals , Male , Medulla Oblongata/metabolism , Oxidative Stress , Environment , Housing, Animal , Hypertension, Renovascular/metabolism , Antioxidants/metabolism , Rats, Inbred F344 , Superoxide Dismutase/metabolism , Medulla Oblongata/enzymology , Lipid Peroxidation , Catalase/metabolism , Protein Carbonylation , Arterial Pressure , Heart Ventricles/enzymology , Hypertension, Renovascular/chemically induced , Kidney/enzymology
Arq. bras. cardiol ; 112(5): 545-552, May 2019. tab, graf
Article in English | LILACS | ID: biblio-1011190


Abstract Background: Obesity can be characterized by low-grade chronic inflammation and is associated with an excesso production of reactive oxygen species, factors that contribute to coronary heart disease and other cardiomyopathies. Objective: To verify the effects of resistance exercise training on oxidative stress and inflammatory parameters on mice with obesity induced by a high-fat diet (HFD). Methods: 24 Swiss mice were divided into 4 groups: standard diet (SD), SD + resistance exercise (SD + RE), diet-induced obesity (DIO), DIO + RE. The animals were fed SD or HFD for 26 weeks and performed resistance exercises in the last 8 weeks of the study. The insulin tolerance test (ITT) and body weight monitoring were performed to assess the clinical parameters. Oxidative stress and inflammation parameters were evaluated in the cardiac tissue. Data were expressed by mean and standard deviation (p < 0.05). Results: The DIO group had a significant increase in reactive oxygen species levels and lipid peroxidation with reduction after exercise. Superoxide dismutase and the glutathione system showed no significant changes in DIO animals, with an increase in SD + RE. Only catalase activity decreased with both diet and exercise influence. There was an increase in tumor necrosis factor-alpha (TNF-α) in the DIO group, characterizing a possible inflammatory condition, with a decrease when exposed to resistance training (DIO+RE). Conclusion: The DIO resulted in a redox imbalance in cardiac tissue, but the RE was able to modulate these parameters, as well as to control the increase in TNF-α levels.

Resumo Fundamento: A obesidade pode ser caracterizada por uma inflamação crônica de baixo grau e está associada à produção excessiva de espécies reativas de oxigênio, fatores que contribuem para doenças coronarianas e outras cardiomiopatias. Objetivo: Verificar os efeitos do treinamento resistido sobre os parâmetros de estresse oxidativo e parâmetro inflamatório em camundongos com obesidade induzida por dieta hiperlipídica (DIO). Métodos: 24 camundongos Swiss foram divididos em 4 grupos: dieta padrão (DP), DP + exercício resistido (DP+ER), obesidade induzida por DIO, DIO + ER. Os animais foram alimentados por 26 semanas com DP ou hiperlipídica realizando treinamento resistido nas 8 semanas finais do estudo. Para avaliar parâmetros clínicos foi realizado o teste de tolerância à insulina (TTI) e monitoramento do peso corporal. No tecido cardíaco foram avaliados parâmetros de estresse oxidativo e inflamação. Dados expressos por média e desvio padrão (p < 0,05). Resultados: O grupo DIO teve um aumento significativo nos níveis espécies reativas e peroxidação lipídica com redução após o exercício. A superóxido dismutase e o sistema glutationa não demonstraram alterações importantes nos animais DIO, com elevação perante DP+ER. Somente a atividade da catalase reduziu tanto com influência da dieta como do exercício. Ocorreu um aumento do fator de necrose tumoral-alfa (TNF-α) no grupo DIO, caracterizando um possível quadro inflamatório, com redução quando expostos ao treino resistido (DIO+ER). Conclusão: A DIO ocasionou um desequilíbrio redox no tecido cardíaco, porém o ER foi capaz de modular estes parâmetros, bem como controlar o aumento do TNF-α.

Animals , Male , Rats , Lipid Peroxidation/physiology , Tumor Necrosis Factor-alpha/analysis , Oxidative Stress/physiology , Resistance Training , Diet, High-Fat/adverse effects , Myocardium/chemistry , Physical Conditioning, Animal , Time Factors , Insulin Resistance , Inflammation/physiopathology
Bol. latinoam. Caribe plantas med. aromát ; 18(3): 336-346, mayo 2019. tab, ilus
Article in English | LILACS | ID: biblio-1008047


The chemical composition of Mangifera indica L. cv. "Kent" leaves was determined by HPLC-ESI-QTOF-MS/MS. Polyphenolic compounds characterized as benzophenone derivatives were the main components found in extracts (1, maclurin 3-C-(2-O-galloyl)-D- glucoside isomer; 2, maclurin 3-C---D-glucoside; 3, iriflophenone 3-C---D-glucoside; 5, maclurin 3-C-(2,3-di-O-galloyl)---D-glucoside; 6, iriflophenone 3-C-(2-O-galloyl)---D-glucoside; 7, methyl-iriflophenone 3-C-(2,6-di-O-galloyl)---D-glucoside) and xanthones (4, mangiferin and 8, 6-O-galloyl-mangiferin). The estrogenic and antioxidant effects of aqueous extracts from Mangifera indica L. cv. "Kent" leaves on ovariectomized rats were determined by uterotrophic assay and malondialdehyde (MDA) levels in erythrocytes, bone, liver, and stomach. We conclude that the polyphenolic compounds from extracts act as exogenous antioxidant agents against oxidative damage in ovariectomized rats.

La composición química de las hojas de Mangifera indica L. cv. "Kent" se determinó por HPLC-ESI-QTOF-MS/MS. Compuestos polifenólicos caracterizados como derivados de benzofenona fueron los componentes principales encontrados en los extractos (1, isómero de la maclurina 3-C-(2-O-galoyil)-D-glucósido; 2, maclurina 3-C-ß-D-glucósido; 3, iriflofenona 3-C-ß-D-glucósido; 5, maclurina 3-C-(2,3-di-O-galloíl)-ß-D-glucósido; 6, iriflofenona 3-C-(2-O-galloil)-ß-D-glucósido; 7, metil-iriflofenona 3-C-(2,6-di-O- galloyl)-ß-D-glucósido) y xantonas (4, mangiferina y 8, 6-O-galoyil-mangiferina). Los efectos estrogénicos y antioxidantes de los extractos acuosos de hojas de Mangifera indica L. cv. "Kent" en ratas ovariectomizadas se determinaron mediante ensayo uterotrófico y la medición de los niveles de malondialdehído (MDA) en eritrocitos, huesos, hígado y estómago. Concluimos que los compuestos polifenólicos de los extractos actúan como agentes antioxidantes exógenos contra el daño oxidativo en ratas ovariectomizadas.

Animals , Female , Rats , Plant Extracts/pharmacology , Plant Extracts/chemistry , Ovariectomy , Mangifera/chemistry , Estrogens/pharmacology , Antioxidants/pharmacology , Stomach/drug effects , Benzophenones/chemistry , Bone and Bones/drug effects , Lipid Peroxidation/drug effects , Chromatography, High Pressure Liquid , Reactive Oxygen Species , Rats, Sprague-Dawley , Plant Leaves/chemistry , Spectrometry, Mass, Electrospray Ionization , Ethanol , Tandem Mass Spectrometry , Liver/drug effects , Malondialdehyde , Antioxidants/chemistry
Arq. neuropsiquiatr ; 77(2): 106-114, Feb. 2019. tab, graf
Article in English | LILACS | ID: biblio-983892


ABSTRACT Ducrosia anethifolia has been recommended as a remedy for neurological disorders. However, the anticonvulsant effects of D. anethifolia essential oil (DAEO) and its major constituent α-pinene have not yet been clarified. Methods: A rat model of pentylenetetrazole (PTZ)-induced convulsions was used. Oxidant and antioxidant parameters were assayed in the temporal lobe. Results: The data showed that DAEO (50, 100 and 200 mg/kg, i.p.) and α-pinene (0.2 and 0.4 mg/kg i.p.) delayed the initiation time, and reduced the duration of myoclonic and tonic-clonic seizures following PTZ injection. The PTZ produced oxidative stress so that malondialdehyde and hydrogen peroxide levels were increased and catalase and peroxidase activity decreased. Pretreatment with DAEO and α-pinene significantly inhibited the above-mentioned enzymatic changes in PTZ-treated animals. Conclusion: The results suggest that α-pinene, at teast in part, was responsible for the induction of the anticonvulsant and antioxidant effects of DAEO in rats.

RESUMO A Ducrosia anethifolia tem sido recomendada como remédio para os distúrbios neurológicos. No entanto, os efeitos anticonvulsivantes do óleo essencial de Ducrosia anethifolia (DAEO) e do seu principal constituinte atfa-pineno (α-pineno) ainda não foram clarificados. Métodos: Foi utilizado um modelo de rato de convulsões induzidas por pentilenotetrazol (PTZ). Os parâmetros oxidante e antioxidante foram ensaiados no lobo temporal do cérebro. Resultados: Os dados mostraram que DAEO (50, 100 e 200 mg / kg, i.p.) e α-pineno (0,2 e 0,4 mg / kg i.p.) retardaram o tempo de iniciação e reduziram a duração das crises mioclônicas e tônico-clônicas após a injeção de PTZ. O PTZ produziu estresse oxidativo, de modo que os níveis de malondialdeído (MDA) e de peróxido de hidrogênio aumentaram e a atividade da catalase e da peroxidase diminuiu. O pré-tratamento com DAEO e α-pineno inibiu significativamente as alterações enzimáticas mencionadas em animais tratados com PTZ. Conclusão: O resultado sugere que α-pineno, peto menos em parte, é responsável peta indução dos efeitos anticonvulsivantes e antioxidantes da DAEO em ratos.

Animals , Male , Seizures/drug therapy , Oils, Volatile/pharmacology , Apiaceae/chemistry , Bicyclic Monoterpenes/pharmacology , Anticonvulsants/pharmacology , Pentylenetetrazole , Seizures/metabolism , Time Factors , Oils, Volatile/chemistry , Lipid Peroxidation/drug effects , Catalase/analysis , Reproducibility of Results , Chromatography, High Pressure Liquid , Treatment Outcome , Rats, Wistar , Peroxidase/analysis , Oxidative Stress/drug effects , Bicyclic Monoterpenes/chemistry , Hydrogen Peroxide/analysis , Malondialdehyde/analysis , Anticonvulsants/chemistry , Antioxidants/analysis , Antioxidants/metabolism
São Paulo; s.n; s.n; 2019. 57 p. graf, tab.
Thesis in Portuguese | LILACS | ID: biblio-997079


O aumento da incidência do câncer de pele está associado à maior exposição à luz solar e a adoção de ações de proteção ao Sol é uma estratégia para minimizar os níveis cumulativos de danos à pele. Os raios ultravioletas (UV), ao alcançarem o tecido cutâneo, podem causar eritema, inflamação, fotoenvelhecimento, formação de rugas e imunossupressão, entre outros, devido à formação de espécies reativas de oxigênio (ERO´s). A formação de ERO´s, como o oxigênio singleto, radical ânion superóxido, peróxido de hidrogênio e radical hidroxil, elevam o risco dos danos foto-oxidativos. O desequilíbrio entre a formação de ERO´s e os mecanismos antioxidantes do organismo desencadeia o estresse oxidativo. Na pele, as ERO´s são as responsáveis pelo dano oxidativo no DNA, proteínas e lipídeos. Identificar e quantificar biomarcadores do estresse oxidativo cutâneo é essencial para a correlação entre os raios UV e seus efeitos. Deve-se isto, em parte, à limitação de métodos para quantificar os parâmetros que são diretamente afetados pela exposição aos raios UV, tais como a peroxidação lipídica. São necessários métodos complementares para avaliação da eficácia de fotoprotetores perante os danos causados por este tipo de estresse. Esta pesquisa projeto compreendeu a avaliação ex vivo da eficácia de filtros solares UVB por meio da quantificação da peroxidação lipídica proveniente do estrato córneo removido por tape stripping. Foram preparados sistemas emulsionados do tipo O/A com os filtros octocrileno, metoxicinamato de octila e salicilato de octila. A caracterização funcional da eficácia fotoprotetora in vitro demonstrou que o filtro octocrileno manteve-se estável, mesmo após exposição solar artificial. Os filtros octocrileno (10% p/p), metoxicinamato de octila (10% p/p) e salicilato de octila (5% p/p) alcançaram, após irradiância, respectivamente, os valores de FPS 5,7 ± 2,1; 4,7 ± 1,5 e 1,0± 0,0. As formulações foram utilizadas na avaliação da eficácia fotoprotetora ex vivo. O método por CLAE, para quantificação da peroxidação lipídica no estrato córneo, possuiu linearidade e demonstrou exatidão e precisão satisfatórias. O estresse pela radiação UV desencadeou a peroxidação lipídica no estrato córneo. Em função do protocolo aplicado, não houve diferenças entre as amostras. A eficácia, com relação à inibição da peroxidação lipídica, foi similar em todas as amostras

The increasing of incidence of skin cancer is associated with greater exposure to sunlight and the adoption of sun protection actions is a strategy to minimize cumulative levels of skin damage. Ultraviolet (UV) rays, when they reach the cutaneous tissue, can cause erythema, inflammation, photoaging, wrinkling and immunosuppression, among other things, due to the formation of reactive oxygen species (ROS). The formation of ROS, such as singlet oxygen, superoxide anion radical, hydrogen peroxide and hydroxyl radical, raise the risk of photooxidative damage. The variation between the formation of ROS and the antioxidant mechanisms of the organism triggers oxidative stress. In the skin, ROS are responsible for oxidative damage in DNA, proteins and lipids. Identifying and quantifying biomarkers of cutaneous oxidative stress is essential for the correlation between UV rays and their effects. This is partially due to the limitation of methods for quantifying parameters that are directly affected by exposure to UV rays, such as lipid peroxidation. Complementary methods are needed to evaluate the effectiveness of photoprotectors because of the damage caused by this type of stress. This research project had the ex vivo evaluation of the efficacy of UVB sunscreens by quantifying the lipid peroxidation from the stratum corneum removed by tape stripping. Emulsified O/A type systems were prepared with the octocrylene, octyl methoxycinnamate and octyl salicylate filters. The functional characterization of photoprotective efficacy in vitro revealed that the octocrylene filter remained stable even after artificial sun exposure. Octocrylene (10% w / w), octyl methoxycinnamate (10% w / w) and octyl salicylate (5% w / w) respectively reached the values of FPS 5.7 ± 2.1; 4.7 ± 1.5 and 1.0 ± 0.0. The formulations were used in the evaluation of ex vivo photoprotective efficacy. The method by HPLC, for quantification of the lipid peroxidation in the stratum corneum, had linearity and demonstrated satisfactory accuracy and precision. UV radiation stress triggered lipid peroxidation in the stratum corneum. Due to the protocol applied, there were no differences between the samples. The efficacy, compared to the inhibition of lipid peroxidation, was similar in all samples

Ultraviolet Rays/adverse effects , Lipid Peroxidation/radiation effects , Sunscreening Agents/analysis , Thiobarbituric Acid Reactive Substances/pharmacokinetics