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1.
Braz. J. Pharm. Sci. (Online) ; 58: e201041, 2022. tab, graf
Artigo em Inglês | LILACS | ID: biblio-1420465

RESUMO

Abstract Curcumin is a plant-derived compound with polypharmacological properties that are hampered by its poor solubility, fast degradation, etc. Wound closure complications that follow tooth extraction are numerous, and relatively frequently additional treatment is needed to prevent unwanted process chronification. The present study aims to compare the effects of free and the nanoliposome-encapsulated curcumin on tooth extraction wound closure. The experiments were performed on Wistar rats where both forms of curcumin were applied topically on a tooth extraction wound for seven days. Changes in tissue oxidative stress (malondialdehyde and oxidized proteins concentrations, and catalase activity) and inflammation (nitric oxide levels and myeloperoxidase activity) related parameters were studied three and seven days following the tooth extraction. Also, the extent of pathohistological changes and osteopontin immunohistochemical expression were studied. The obtained results indicate that both forms of curcumin prevent an increase in oxidative stress and inflammation-related parameters in the studied samples at 3-and 7-day time points. Additionally, we found that curcumin diminished tissue inflammatory response and osteopontin expression, while at the same time it caused faster granulation tissue maturation. The encapsulation of curcumin in nanoliposomes proved to be better in improving the extraction wound healing process than the free curcumin, giving this formulation a potential in the pharmaceutical industry.


Assuntos
Animais , Masculino , Feminino , Ratos , Extração Dentária/classificação , Infecção dos Ferimentos/classificação , Ferimentos e Lesões/tratamento farmacológico , Curcumina/análise , Técnicas de Fechamento de Ferimentos/classificação , Inflamação/tratamento farmacológico , Cicatrização/efeitos dos fármacos , Estresse Oxidativo
2.
Life Sci ; 280: 119704, 2021 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-34111461

RESUMO

AIMS: The present study aimed to evaluate the protective action of thymol towards l-arginine-induced acute pancreatitis (AP) by studying the function of rat peritoneal immune cells. MAIN METHODS: Rat peritoneal exudate cells (PECs), obtained 24 h after the injection of l-arginine (350 mg/100 g of b.w.), were evaluated for mitochondrial activity (MTT assay), adherence capacity (methylene-blue assay), and phagocyte enzyme activity (myeloperoxidase, MPO, assay). The activity of α-amylase and free MPO, as well as the concentration of reactive oxygen species (ROS, i.e. O2-), were determined in the peritoneal exudate fluid. Also, serum α-amylase activity determination and pancreatic tissue pathohistological analysis were performed. KEY FINDING: The administered thymol (50 and 100 mg/kg, per os) caused a significant decrease in the PEC mitochondrial activity and adherence capacity when compared with these functions of PECs isolated from rats with AP. A decrease in cellular MPO activity, as well as in the levels of ROS, α-amylase, and free MPO in peritoneal exudates was found in animals treated with thymol compared to the control animals with AP. Additionally, thymol administration prevented an increase in serum α-amylase activity, accompanied by the decrease in pancreatic tissue damage that follows l-arginine application. SIGNIFICANCE: The present results showed that thymol exerts significant immunomodulatory properties and a potential to silence PEC functions in inflammatory conditions such as the AP induced by l-arginine.


Assuntos
Arginina/efeitos adversos , Imunidade Celular/efeitos dos fármacos , Pancreatite/induzido quimicamente , Pancreatite/tratamento farmacológico , Substâncias Protetoras/uso terapêutico , Timol/uso terapêutico , Animais , Células Cultivadas , Granulócitos/efeitos dos fármacos , Granulócitos/imunologia , Granulócitos/patologia , Masculino , Pâncreas/efeitos dos fármacos , Pâncreas/imunologia , Pâncreas/patologia , Pancreatite/imunologia , Pancreatite/patologia , Cavidade Peritoneal/patologia , Ratos , Ratos Wistar
3.
Can J Physiol Pharmacol ; 99(2): 185-191, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33509026

RESUMO

Doxorubicin is an anticancer agent that is commonly used to treat a number of tumors and is associated with acute and chronic changes of the cardiovascular system. Ellagic acid has strong free radical scavenging capacity, neuroprotective and hepatoprotective effects, and is known to protect against changes occurring due to diabetes, cardiovascular diseases, and cancer. Twenty-four Wistar rats were divided in four groups: control group received saline, doxorubicin group received doxorubicin in a single dose of 20 mg/kg, ellagic acid group received ellagic acid in a dose of 4 mg/kg, and doxorubicin + ellagic acid group received doxorubicin and ellagic acid in same doses as in previous groups. The effect of ellagic acid treatment, alone or in combination with doxorubicin, was studied on isolated heart frequency and strength of the contraction, and on thoracic aorta contractile responses. Application of ellagic acid to rats pre-treated with doxorubicin significantly prevented functional changes occurring in the heart, but not in the thoracic aorta tissue. Ellagic acid statistically significantly (p < 0.001) prevented doxorubicin-induced increase in heart rate, while at the same time increased single contraction force (p < 0.001) and attenuated morphological changes on heart tissue induced by doxorubicin. We can conclude that ellagic acid has potential to prevent doxorubicin-induced changes of the cardiovascular system.


Assuntos
Doxorrubicina/efeitos adversos , Ácido Elágico/farmacologia , Coração/efeitos dos fármacos , Animais , Citoproteção/efeitos dos fármacos , Relação Dose-Resposta a Droga , Masculino , Ratos , Ratos Wistar
4.
Can J Physiol Pharmacol ; 99(1): 110-114, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33449845

RESUMO

Oleuropein (OLE) is the main bioactive ingredient in the leaves of the olive plant Olea europaea L. (Oleaceae), which has proven beneficial due to the antiinflammatory, antiatherogenic, anticancer, antimicrobial, and antiviral effects. This study aimed to investigate the antihypertensive and vasodilator potential of OLE by analyzing its acute effects on spontaneous atrial contractions and vasomotor responses of the isolated thoracic aorta in rats. We showed that the application of OLE induces negative chronotropic and inotropic effects on the heart. OLE also causes mild aortic vasodilation given that the maximal reduction in tension of intact aortic rings precontracted with phenylephrine was approximately 30%. This vasodilation is likely dependent on the nitric oxide released from the endothelium based on the effect obtained on denuded and phenylephrine precontracted aortic rings and responses reordered following vasoconstriction induced by high concentrations of K+ and heparin. Our findings provide a basis for further testing of OLE cardiovascular effects, which may lead to subsequent clinical research for its application in the treatment of hypertension and heart disease.


Assuntos
Anti-Hipertensivos/farmacologia , Endotélio Vascular/efeitos dos fármacos , Átrios do Coração/efeitos dos fármacos , Glucosídeos Iridoides/farmacologia , Vasodilatadores/administração & dosagem , Animais , Anti-Hipertensivos/uso terapêutico , Aorta Torácica/efeitos dos fármacos , Avaliação Pré-Clínica de Medicamentos , Endotélio Vascular/metabolismo , Átrios do Coração/metabolismo , Humanos , Hipertensão/tratamento farmacológico , Glucosídeos Iridoides/uso terapêutico , Masculino , Modelos Animais , Óxido Nítrico/metabolismo , Oleaceae/química , Folhas de Planta/química , Ratos , Vasoconstrição/efeitos dos fármacos , Vasodilatação/efeitos dos fármacos
5.
Chem Biodivers ; 17(6): e2000206, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32302446

RESUMO

In this work, we explored the possible polypharmacological potential of the already established antimicrobials against gastrointestinal pathogens, 4-(alkylamino)-3-nitrocoumarins, as antianxiety agents, using a battery of in vivo experiments. Three chosen coumarin derivatives, differing in the substituent (sec-butylamino, hexadecylamino, or benzylamino) at position 4, at the doses of 25, 50 and 100 mg kg-1 , were evaluated in light/dark, open-field, horizontal wire and diazepam-induced sleep models using male BALB/c mice. Depending on the applied dose, all three tested coumarins displayed a noteworthy anxiolytic-like effect. 4-(sec-Butylamino)-3-nitro-2H-chromen-2-one and 4-(hexadecylamino)-3-nitro-2H-chromen-2-one could be recognized as true anxiolytics in the lowest applied dose, based on three tests, without exerting any sedative effects. Thus, the 3-nitrocoumarin core deserves further chemical diversity exploration in the 'antianxiety' direction.


Assuntos
Ansiolíticos/química , Cumarínicos/química , Animais , Ansiolíticos/farmacologia , Ansiolíticos/uso terapêutico , Ansiedade/tratamento farmacológico , Comportamento Animal/efeitos dos fármacos , Cumarínicos/farmacologia , Cumarínicos/uso terapêutico , Diazepam/farmacologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Sono/efeitos dos fármacos
6.
Can J Physiol Pharmacol ; 98(2): 117-123, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31995714

RESUMO

Since cisplatin-induced nephrotoxicity has very important clinical consequences, the purpose of this study was to determine the potential protective effect of aminoguanidine on the acute kidney injury caused by cisplatin. Experiments were done on 40 Wistar rats divided into four groups. The CIS group received cisplatin in a single dose of 8 mg/kg, while the CISAG group received the same dose of cisplatin and aminoguanidine (100 mg/kg) by intraperitoneal injections. Animals in the AG group received only aminoguanidine (100 mg/kg) and those in the C group received saline. Quantitative evaluation of structural and functional alterations in the kidneys was performed by analysis of biochemical and parameters of oxidative stress and by histological and morphometric analysis of renal sections. Histological sections of kidney showed structural damage of proximal tubules and glomeruli that were induced by cisplatin. Morphometric analysis revealed statistically significant differences in the area of proximal tubules and the size and cellularity of glomeruli between the CIS and CISAG groups. Glomerular basement membrane thickness was increased in the CIS group, while aminoguanidine attenuated these changes in the CISAG group of rats. Our results suggest that aminoguanidine acts protectively and repairs structural and functional damage of kidney by engaging the existent antioxidative potential at the level of renal tissue.


Assuntos
Injúria Renal Aguda/induzido quimicamente , Injúria Renal Aguda/patologia , Cisplatino/efeitos adversos , Guanidinas/farmacologia , Rim/efeitos dos fármacos , Rim/patologia , Injúria Renal Aguda/tratamento farmacológico , Animais , Catalase/metabolismo , Guanidinas/uso terapêutico , Rim/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Masculino , Óxido Nítrico Sintase Tipo II/metabolismo , Ratos , Ratos Wistar
7.
Can J Physiol Pharmacol ; 98(2): 111-116, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31369713

RESUMO

Lycopene is one of the most potent antioxidants among carotenoids due to its ability to quench singlet oxygen and react with free radicals to reduce DNA damage. Methotrexate is widely used in the treatment of several types of cancers and autoimmune diseases. One of the most common side effects of a high-dose of methotrexate is kidney injury. In this study, we evaluated effects of lycopene on the Madin-Darby canine kidney cells (MDCK) treated with methotrexate through the estimation of their mitochondrial and lysosomal functions ((4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide reduction assay and neutral red uptake assay) and changes in cell oxidative status (determination of advanced oxidized proteins concentrations and reduced glutathione levels) and lysosomal enzymes activity (ß-N-acetyl glucosaminidase activity). Results of our study showed that lycopene applied in high concentration caused significant impairment of the MDCK function leading to cell death. Contrarily, in relatively low concentrations lycopene moderately ameliorated methotrexate-induced MDCK cell death estimated by both biochemical and microscopic analyses. It also prevented a significant decline in the MDCK cell lysosomal function estimated by neutral red accumulation ability and activity of the lysosomal enzyme ß-N-acetyl glucosaminidase.


Assuntos
Licopeno/farmacologia , Metotrexato/farmacologia , Animais , Cães , Relação Dose-Resposta a Droga , Lisossomos/efeitos dos fármacos , Lisossomos/enzimologia , Células Madin Darby de Rim Canino , Vermelho Neutro/metabolismo , Estresse Oxidativo/efeitos dos fármacos
8.
Food Chem Toxicol ; 133: 110794, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31473339

RESUMO

Despite being renowned for its volatiles, the data on the toxicity of the essential oil of lemon balm (Melissa officinalis L., Lamiaceae) is rather limited compared to its solvent/water-soluble extractibles. In this study, the aerial parts essential oil of M. officinalis, with over 130 constituents identified herein, 26 of which detected for the first time, was investigated for acute oral toxicity in BALB/c mice. The oil, composed of predominantly monoterpene aldehydes, citronellal (21.2-21.8%), neral (17.8-18.4%), and geranial (22.9-23.5%), which were assayed in parallel with the oil in some tests, induced significant changes in animal behavior, as well as altered biochemical parameters reflecting liver and kidney functions. Different pathological changes in the stomach, duodenum, liver, and kidneys were detected when the oil was administered in doses higher than 1 g kg-1. A depletion in the liver/kidney antioxidant capacities and an increased rate of lipid peroxidation was noted for animals treated with lemon balm oil. The calculated value of the oral LD50 in BALB/c mice (2.57 g kg-1) infers that the essential oil is only moderately toxic.


Assuntos
Melissa/química , Óleos Voláteis/toxicidade , Óleos de Plantas/toxicidade , Administração Oral , Aldeídos/metabolismo , Animais , Artemia/efeitos dos fármacos , Sistema Digestório/efeitos dos fármacos , Sistema Digestório/patologia , Feminino , Glutationa/metabolismo , Rim/efeitos dos fármacos , Rim/patologia , Dose Letal Mediana , Peroxidação de Lipídeos/efeitos dos fármacos , Malondialdeído/metabolismo , Camundongos Endogâmicos BALB C , Óleos Voláteis/administração & dosagem , Óleos Voláteis/análise , Peroxidase/metabolismo , Componentes Aéreos da Planta/química , Óleos de Plantas/administração & dosagem , Óleos de Plantas/análise
9.
Medicina (Kaunas) ; 55(6)2019 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-31238579

RESUMO

Background and objectives: Dysregulation of TGF-ß signaling plays multiple roles in cancer development and progression. In the canonical TGF-ß pathway, TGF-ß regulates the expression of hundreds of target genes via interaction with Smads, signal transducers and transcriptional modulators. We evaluated the association of TGF-ß1, Smad2, and Smad4, the key components of canonical TGFß pathway, with clinicopathologic characteristics of urothelial bladder cancer, and assessed their prognostic value in prediction of patients' outcome. Materials and Methods: Immunohistochemical analysis of TGF-ß1, Smad2, and Smad4 expression was performed on 404 urothelial bladder cancer samples, incorporated in tissue microarrays. Expression status was correlated with clinicopathological and follow-up data. The median follow-up was 61 months. Results: High expression of TGF-ß1, Smad2, and Smad4 was detected in 68.1%, 31.7% and 45.2% of the tumors, respectively. TGF-ß1 overexpression was significantly associated with high tumor grade, and advanced pathologic stage (p < 0.001, respectively). Conversely, high Smad2 and Smad4 expression was linked to low tumor grade (p = 0,003, p = 0.048, respectively), and low tumor stage (p < 0.001, p = 0.003, respectively). Smad2 showed an inverse correlation with variant morphology and divergent differentiation of urothelial tumors (p = 0.014). High TGF-ß1 correlated directly, while Smad2 and Smad4 correlated inversely to cancer-specific death (p = 0.043, p = 0.003, and p = 0.022, respectively). There was a strong relationship between Smad2 and Smad4 expression (p < 0.001). Survival analyses showed that high Smad2 and Smad4 expression was associated with longer overall survival (p = 0.003, p = 0.034, respectively), while in multivariate regression analysis TGF-ß1 manifested as an independent predictor of poor outcome. Conclusions: Unraveling the complex roles and significance of TGF-ß signaling in urothelial bladder cancer might have important implications for therapy of this disease. Assessment of TGF-ß pathway status in patients with urothelial bladder cancer may provide useful prognostic information, and identify patients that could have the most benefit from therapy targeting TGF-ß signaling cascade.


Assuntos
Prognóstico , Fator de Crescimento Transformador beta1/análise , Neoplasias da Bexiga Urinária/sangue , Biomarcadores Tumorais/análise , Biomarcadores Tumorais/sangue , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Valor Preditivo dos Testes , Modelos de Riscos Proporcionais , Sérvia , Proteína Smad2/análise , Proteína Smad2/sangue , Proteína Smad4/análise , Proteína Smad4/sangue , Fator de Crescimento Transformador beta1/sangue
10.
Mol Cell Biochem ; 458(1-2): 185-195, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31004308

RESUMO

In this study, we aimed to evaluate whether the encapsulation of ellagic acid (EA) into nanoliposomes would improve its potential in preventing cyclophosphamide-induced liver damage. Stability and antioxidative potential of free and encapsulated EA were determined. Experimental study conducted in vivo included ten groups of rats treated with cyclophosphamide and ellagic acid in its free and encapsulated form during 5 days. The protective effect of EA in its free and encapsulated form was determined based on serum liver function, liver tissue antioxidative capacities, and oxidative tissue damage parameters. Also, tissue morphological changes following cyclophosphamide administration were studied using standard histopathological and immunohistochemical analyses. The encapsulation of EA significantly prevented its degradation and improved its antioxidant properties in in vitro conditions. In in vivo experiments in both forms of EA were found to prevent rat liver damage induced by cyclophosphamide estimated through the changes in serum liver-damage parameters and tissue antioxidant capacities, as well as based on oxidatively modified lipids and proteins. Also, changes in morphology of liver cells and the expressions of Bcl-2, HIF-1α, and CD15 molecules in livers of animals of different experimental groups are in accordance with the obtained biochemical parameters. Thus, the encapsulation process might be effective in preventing EA from different environmental influences and could significantly increase its hepatoprotective potential. The encapsulation could prevent ellagic acid degradation and might deliver this potent compound to its target tissue in significantly larger quantities than when it is administered in its free form.


Assuntos
Doença Hepática Induzida por Substâncias e Drogas/prevenção & controle , Ciclofosfamida/efeitos adversos , Ácido Elágico/farmacologia , Fígado/metabolismo , Nanopartículas , Animais , Doença Hepática Induzida por Substâncias e Drogas/metabolismo , Doença Hepática Induzida por Substâncias e Drogas/patologia , Ciclofosfamida/farmacologia , Regulação da Expressão Gênica/efeitos dos fármacos , Subunidade alfa do Fator 1 Induzível por Hipóxia/biossíntese , Antígenos CD15/biossíntese , Lipossomos , Fígado/lesões , Fígado/patologia , Proteínas Proto-Oncogênicas c-bcl-2/biossíntese , Ratos , Ratos Wistar
11.
Oxid Med Cell Longev ; 2018: 2627917, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29725494

RESUMO

Methotrexate is an antimetabolic drug with a myriad of serious side effects including nephrotoxicity, which presumably occurs due to oxidative tissue damage. Here, we evaluated the potential protective effect of lycopene, a potent antioxidant carotenoid, given in two different pharmaceutical forms in methotrexate-induced kidney damage in rats. Serum biochemical (urea and creatinine) and tissue oxidative damage markers and histopathological kidney changes were evaluated after systemic administration of both lycopene dissolved in corn oil and lycopene encapsulated in nanoliposomes. Similar to previous studies, single dose of methotrexate induced severe functional and morphological alterations of kidneys with cell desquamation, tubular vacuolation, and focal necrosis, which were followed by serum urea and creatinine increase and disturbances of tissue antioxidant status. Application of both forms of lycopene concomitantly with methotrexate ameliorated changes in serum urea and creatinine and oxidative damage markers and markedly reversed structural changes of kidney tissue. Moreover, animals that received lycopene in nanoliposome-encapsulated form showed higher degree of recovery than those treated with free lycopene form. The findings of this study indicate that treatment with nanoliposome-encapsulated lycopene comparing to lycopene in standard vehicle has an advantage as it more efficiently reduces methotrexate-induced kidney dysfunction.


Assuntos
Carotenoides/metabolismo , Nefropatias/induzido quimicamente , Rim/patologia , Metotrexato/efeitos adversos , Animais , Nefropatias/patologia , Licopeno , Masculino , Ratos , Ratos Wistar
12.
J Dent Sci ; 13(2): 103-108, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30895104

RESUMO

BACKGROUND/PURPOSE: Tooth extraction is often followed by a number of different complications that demand additional treatment. In order to accelerate healing processes and decrease the complication occurrence various agents, growth factors, natural and synthetic antioxidants (e.g coenzyme Q10-CoQ10), are applied. Due to the partially known health-promoting effects of CoQ10 we decided to assess potential of it's encapsulated in nanoliposomes form on wound healing process following tooth extraction. MATERIALS AND METHODS: Effects of free and encapsulated form of CoQ10 on wound healing processes after tooth extraction in rats, 3 and 7 days following surgical procedure, was studied by means of tissue biochemical (myeloperoxidase activity and nitric oxide (NO) concentrations) and pathohistological analysis. RESULTS: The obtained results indicate that the encapsulated form of CoQ10 compared to control and CoQ10 treated animals statistically significantly decreases inflammatory process estimated through myeloperoxidase activity and NO concentrations, as well as based on histopathological analysis 3 and 7 days following surgery. CONCLUSION: The results of this study unequivocally prove that the encapsulation of CoQ10 in nanoliposomes enhances CoQ10 activity by accelerating wound healing process after tooth extraction.

13.
Phytother Res ; 31(1): 115-123, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-27714928

RESUMO

We assessed possible protective effect of bilberry diet in rat model of nephrotoxicity. In vivo and in vitro antioxidant activity and chemical profiling of this functional food was performed. With aid of HPLC-DAD and spectrophotometric method, 15 individual anthocyanins were quantified alongside total tannin, phenylpropanoid, and anthocyanin content. The study was conducted on four groups of rats: control, treated with only gentamicin, treated with only bilberry, and treated with both gentamicin and bilberry. Kidney function was evaluated by tracking urea and creatinine. Morphology of renal tissue and its changes were recorded pathohistologically and quantified morphometrically. Bilberry (100 mg/kg daily) showed strong nephroprotective effect against gentamicin toxicity in rats (as shown through MDA, AOPP, and catalase levels). In conclusion, the demonstrated protective activity of bilberry extract matched well with the assessed in vivo and in vitro antioxidant activity as well as with its polyphenolic content, particularly with high anthocyanin levels. Copyright © 2016 John Wiley & Sons, Ltd.


Assuntos
Antibacterianos/efeitos adversos , Cromatografia Líquida de Alta Pressão/métodos , Gentamicinas/efeitos adversos , Extratos Vegetais/química , Vaccinium myrtillus/química , Animais , Antibacterianos/administração & dosagem , Antioxidantes , Gentamicinas/administração & dosagem , Masculino , Extratos Vegetais/farmacologia , Ratos
14.
Life Sci ; 147: 85-91, 2016 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-26812477

RESUMO

AIMS: One of the most popular beverages worldwide, green tea, was investigated for its potential protective effect in a rat model of gentamicin-induced nephrotoxicity by monitoring functional and morphological changes in kidneys. MAIN METHODS: The study was conducted on four groups of rats: control group (C), treated with only gentamicin (GM), treated with only green tea (GT) and treated with both gentamicin and green tea (GT+GM). Kidney function, oxidant and antioxidant parameters of renal tissue, as well as histopathological studies were assessed. Morphometric analysis was used to quantify these histopathological changes. KEY FINDINGS: Gentamicin caused significant elevations in serum creatinine and urea and oxidative stress parameter (AOPP), while antioxidative enzyme catalase was significantly decreased. Histological sections of kidneys in GM group revealed necrosis of proximal tubules, vacuolation of cytoplasm and massive mononuclear inflammatory infiltrates in interstitium. Coadministration of green tea with gentamicin histologically showed renoprotective effect. Histological results were confirmed and quantified by morphometric analysis. Also in this group we measured ameliorated parameters of renal functions and antioxidative defense. SIGNIFICANCE: Regenerative potential of green tea after renal injury induced by gentamicin could be explained through the decrease of oxidative stress and lipid peroxidation. Green tea is a natural antioxidant, with many health promoting effects, widely available and in accordance to that affordable. Because of the established habits, people largely consume it as a beverage. It could be beneficial in the reduction of oxidative stress and changes caused by it primarily in renal tubules and interstitium.


Assuntos
Antioxidantes/farmacologia , Gentamicinas/toxicidade , Nefropatias/prevenção & controle , Extratos Vegetais/farmacologia , Chá/química , Animais , Antibacterianos/toxicidade , Antioxidantes/isolamento & purificação , Antioxidantes/metabolismo , Catalase/metabolismo , Feminino , Rim/efeitos dos fármacos , Rim/patologia , Nefropatias/induzido quimicamente , Testes de Função Renal , Túbulos Renais/efeitos dos fármacos , Túbulos Renais/patologia , Peroxidação de Lipídeos/efeitos dos fármacos , Masculino , Estresse Oxidativo/efeitos dos fármacos , Ratos , Ratos Wistar
15.
Ren Fail ; 34(5): 622-7, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22417102

RESUMO

Frequent therapeutical use of an aminoglycoside antibiotic gentamicin (GM) is limited by its nephrotoxic effects often characterized by both morphological and functional alterations of kidney leading to acute renal failure. The aim of this study was to examine the effect of dietary calcium supplementation on GM-induced nephrotoxicity in rats. Experiments were performed on 30 adult male Wistar rats divided into three groups of 10 animals each. G-group received GM intraperitoneally at a dose of 100 mg/kg; GCa-group received the same dose of GM concomitantly with 1 g/kg calcium carbonate given orally; and C-group, serving as control, received 1 mL/day of normal saline. All groups were treated during 8 consecutive days. Quantitative evaluation of GM-induced structural and functional changes of kidney was performed by histopathological, morphometrical, and biochemical analyses. Compared with control, G-group of rats were found to have diffusely and unequally thickened glomerular basement membrane with neutrophil cells infiltration. In addition, vacuolization of cytoplasm of proximal tubule cells with coagulation-type necrosis was observed. These GM-induced pathological lesions were significantly reduced in the rats of GCa-group. Morphometric analysis revealed statistically significant differences in the size of glomeruli (area, major and minor axes, perimeter), optical density, and roundness of glomeruli (p < 0.05) between G and GCa groups. Biochemical analysis showed significant elevation in blood urea and serum creatinine concentrations, whereas potassium concentration was lowered in G-group compared with the other groups (p < 0.01). It is concluded that oral supplementation of calcium during treatment with GM resulted in significant reduction of morphological and functional kidney alterations.


Assuntos
Injúria Renal Aguda/tratamento farmacológico , Cálcio/administração & dosagem , Suplementos Nutricionais , Rim/efeitos dos fármacos , Injúria Renal Aguda/induzido quimicamente , Injúria Renal Aguda/patologia , Administração Oral , Animais , Modelos Animais de Doenças , Gentamicinas/toxicidade , Rim/patologia , Masculino , Ratos , Ratos Wistar , Resultado do Tratamento
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