Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 2.857
Filter
1.
Braz. j. biol ; 83: e245330, 2023. tab, graf
Article in English | LILACS, VETINDEX | ID: biblio-1339394

ABSTRACT

Abstract Background The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Aim The study examined the expression of Neuroglobin (Ngb) and Hypoxia-inducible factor-1α (Hif-1α) in adult and young yak brain tissues, and provided researchers with meaningful insight into the anatomy, physiology, and biochemistry of this mammal. Method The study employed immunohistochemistry (IHC), quantitative real-time PCR (qRT-PCR), and Western blot (WB) to obtain the results. Results Ngb and Hif-1α were significantly (P<0.05) expressed in the cerebellar cortex, piriform lobe, medulla, and corpus callosum of the adult yak while in the young yak brain tissues, the protein expressions were significantly found in the white matter of the cerebellum, pineal gland, corpus callosum, and cerebellar cortex. The Ngb and Hif-1α expression showed similarities and differences. This may have resulted from similar animal species, source of nutrition, age factors, brain size, emotional activities, and communication. The findings documented that Ngb and Hif-1α are commonly expressed in various adult and young yak brain tissues. Multiple roles in the brain tissues of the adult and young yaks are involved in the expression and distribution and are proposed to play a significant role in the adaptation of the yak to the high altitude environment. Conclusion This study provides meaningful data to understand the adaptive mechanism to hypoxia and recommended researchers to expand on the adaptive mechanism and brain tissues that are not recorded.


Resumo Contexto O cérebro é um órgão que funciona como o centro do sistema nervoso em todos os animais vertebrados e na maioria dos invertebrados. Objetivo O estudo examinou a expressão de neuroglobina (Ngb) e fator-1α indutível por hipóxia (Hif-1α) em tecidos cerebrais de iaques adultos e jovens e forneceu aos pesquisadores uma visão significativa da anatomia, fisiologia e bioquímica desse mamífero. Método O estudo utilizou imuno-histoquímica (IHC), PCR quantitativo em tempo real (qRT-PCR) e western blot (WB) para a obtenção dos resultados. Resultados Ngb e Hif-1α foram significativamente (P < 0,05) expressos no córtex cerebelar, lobo piriforme, medula e corpo caloso do iaque adulto, enquanto nos tecidos cerebrais do iaque jovem as expressões proteicas foram encontradas significativamente na substância branca do cerebelo, glândula pineal, corpo caloso e córtex cerebelar. A expressão de Ngb e Hif-1α apresentou semelhanças e diferenças. Isso pode ter resultado de espécies animais semelhantes, fonte de nutrição, fatores de idade, tamanho do cérebro, atividades emocionais e comunicação. Os resultados documentaram que o Ngb e o Hif-1α são comumente expressos em vários tecidos cerebrais de iaques adultos e jovens. Múltiplos papéis nos tecidos cerebrais de iaques adultos e jovens estão envolvidos na expressão e distribuição e são propostos para desempenhar um papel significativo na adaptação do iaque ao ambiente de alta altitude. Conclusão Este estudo fornece dados significativos para compreender o mecanismo adaptativo à hipóxia e recomendou que os pesquisadores expandissem o mecanismo adaptativo e os tecidos cerebrais que não foram registrados.


Subject(s)
Animals , Hypoxia-Inducible Factor 1, alpha Subunit/genetics , Hypoxia , Brain , RNA, Messenger , Cattle , Neuroglobin
2.
Rev. ecuat. pediatr ; 23(3): 183-191, 12 de Diciembre del 2022.
Article in Spanish | LILACS | ID: biblio-1411207

ABSTRACT

Introducción: Hasta el 20% de pacientes que acuden a emer-gencias pediátricas presentan alza térmica, al cual tiene efectos fisiológicos sobre la frecuencia cardiaca, respiratoria y presión arterial. El objetivo del presente estudio fue medir la influencia de la temperatura sobre la saturación de oxígeno en niños con fiebre, que viven en Quito (2800 msnm), atendidos en un hospital de segundo nivel. Métodos: El presente estudio observacional-cruzado, se realizó en el Hospital Pablo Arturo Suárez, en el período Julio a diciembre del 2019. Con muestra no probabilística se incluyeron niños con fiebre y se registraron edad, temperatura, frecuencia cardíaca, frecuencia respiratoria, tensión arterial, saturación de oxígeno al ingreso y 1 hora luego del tratamiento antipirético. Se comparan promedios con T de student; la asociación se presenta con el coeficiente de correlación de Spearman (R) y Odds ratio. Resultados: Se incluyeron 196 pacientes. Hubo una disminución de la saturación ante el aumento de la temperatura en niños lactantes menores, lactantes mayores y pre-escolares. Este efecto no ocurre en niños escolares y tampoco en pre-adolescentes o adolescentes. El punto de corte a partir del cual ocurre este evento es 38.35°C con un OR de 3.33 y un OR de 22 cuando la hipertermia ocurre en etapa pre-escolar. El cambio de disminución -1.26±0.03°C, incrementa 1.28 ±0.98% la saturación de oxígeno. Conclusión: La temperatura >38.4°C disminuye la saturación de oxígeno en niños pre-escolares, lactantes menores y mayores.


Introduction: Up to 20% of patients who come to pediatric emergencies have a temperature rise, which has physiological effects on heart rate, respiratory rate, and blood pressure. The objective of this study was to measure the influence of temperature on oxygen saturation in children with fever living in Quito (2800 masl) treated in a second-level hospital. Methods: The present observational-crossover study was carried out at the Pablo Arturo Suárez Hospital from July to December 2019. With a nonprobabilistic sample, children with fever were included; age, temperature, heart rate, respiratory rate, blood pressure, and oxygen saturation were recorded on admission and 1 hour after antipyretic treatment. Means are compared with Student's t test; the association is presented with Spearman's (R) correlation coefficient and odds ratio. Results: A total of 196 patients were included. There was a decrease in saturation with increasing temperature in younger infants, older infants, and preschool children. This effect does not occur in school children or in preadolescents or adoles-cents. The cutoff point from which this event occurs is 38.35°C with an OR of 3.33 and an OR of 22 when hyperthermia occurs in the preschool stage. The decrease of -1.26 ± 0.03°C°C increases oxygen saturation by 1.28 ± 0.98%. Conclusion: Temperature >38.4°C decreases oxygen saturation in preschool children and younger and older infants.


Subject(s)
Humans , Infant, Newborn , Infant , Child, Preschool , Child , Oxygen Level , Fever , Child , Hypoxia
3.
Rev. ecuat. pediatr ; 23(3): 217-224, 12 de Diciembre del 2022.
Article in Spanish | LILACS | ID: biblio-1411252

ABSTRACT

Introducción: La Neumonía Adquirida en la Comunidad (NAC) es considerada un problema de salud pública, afecta especialmente a niños menores de 5 años. Los episodios que requieren hospitalización generan importantes gastos económicos institucionales. El objetivo del presente estudio fue describir los resultados clínicos y el costo directo del tratamiento de la NAC en dos hospitales de referencia de Quito-Ecuador. Métodos: El presente estudio transversal, se realizó en niños >28 días y < 5 años, hospitali-zados en dos instituciones de salud pública en la ciudad de Quito, Ecuador, con NAC. Va-riables fueron: descripciones demográficas, resultado clínico, costo del tratamiento. Se presentan los datos con estadística descriptiva. Resultados: Se analizan 355 casos, 190 hombres (53.5%). Lactantes menores 95 casos (26.8%), lactantes mayores 130 casos (36.6%) y escolares 130 casos (36.6%). Los síntomas principales fueron la hipoxemia 353 casos (99.4%), taquipnea 239 casos (67.3%) y taquicardia 177 casos (49.9%). Con dificultas respiratoria leve 268 casos (75.5%). El tratamiento principalmente fue con analgésicos 345 casos (97.2%), antibióticos 335 casos (94.4%), nebulización con bronco dilatador 207 casos (58.3), líquidos parenterales 203 casos (57.2%) y oxígeno en 107 casos (30.1%). El costo promedio de la atención hospitalaria de una NAC fue de 736.18 ± 320.51 USD. No existió diferencia de costos entre instituciones (P >0.05). Conclusión: El costo sanitario de la atención médica en Ecuador es de aproximadamente 2 salarios mínimos vitales. Los tratamientos están ajustados a las guías de práctica médica vigentes.


Introduction: Community-acquired pneumonia (CAP) is a public health problem mainly affecting children under five. Episodes that require hospitalization generate high institutional financial costs. The objective of this study was to describe the clinical results and the direct cost of CAP treatment in two reference hospitals in Quito-Ecuador. Methods: This cross-sectional study was conducted in children >28 days and <5 years hospitalized in two public health institutions in Quito, Ecuador, with CAP. Variables were demographic descriptions, clinical outcomes, and cost of treatment. The data are presented with descriptive statistics. Results: A total of 355 cases were analyzed, including 190 men (53.5%). Younger infants had 95 cases (26.8%), older infants 130 cases (36.6%), and schoolchildren 130 cases (36.6%). The main symptoms were hypoxemia in 353 cases (99.4%), tachypnea in 239 cases (67.3%), tachycardia in 177 cases (49.9%), and mild respiratory difficulties in 268 cases (75.5%). Treatment was mainly with analgesics in 345 cases (97.2%), antibiotics in 335 cases (94.4%), bronchodilator nebulization in 207 cases (58.3), par-enteral fluids in 203 cases (57.2%), and oxygen in 107 cases (30.1%). The average cost of hospital care for CAP was 736.18 ± 320.51 USD. There was no cost difference between institutions (P >0.05). Conclusion: The health cost of medical care in Ecuador is approximately two times the minimum living wage, and treatments are adjusted to current medical practice guidelines.


Subject(s)
Humans , Infant , Child, Preschool , Pneumonia , Child , Costs and Cost Analysis , Tachypnea , Hypoxia
4.
J. Health Biol. Sci. (Online) ; 10(1): 1-6, 01/jan./2022. ilus
Article in Portuguese | LILACS | ID: biblio-1411452

ABSTRACT

Objetivo: este estudo objetivou conhecer a vivência de fisioterapeutas com pacientes hospitalizados sob oxigenoterapia, bem como identificar os desafios vivenciados durante a sua intervenção. Métodos: trata-se de um estudo quantitativo e transversal, realizado no período de setembro de 2021 a março de 2022, com fisioterapeutas atuantes em hospitais da cidade de Fortaleza-CE. A coleta de dados foi realizada de forma presencial e virtual pela plataforma Google Forms, por meio de um questionário com perguntas objetivas sobre vivência, intervenção e desafios durante assistência ao paciente sob oxigenoterapia. Os dados coletados foram armazenados no Microsoft Excel® 2010 e analisados pelo SPSS® versão 20.0, utilizando-se de estatística descritiva. Resultados: participaram do estudo 101 fisioterapeutas, 76,2% do gênero feminino, e 45,5% dos participantes eram graduados há 5 anos. Destes, 83,2% dos fisioterapeutas afirmaram que SpO2 < 90% é indicativo de oxigenoterapia. A maioria (79,2%) discordou da utilização da máscara de Venturi para pacientes com Covid-19 e apontou a cânula nasal de alto fluxo (39,6%) e a máscara reservatório não reinalante (40,6%) como as mais utilizadas. Entre os desafios enfrentados durante a assistência, a interação com a equipe interdisciplinar (25,70%), o desmame da oxigenoterapia (21,80%) e a indisponibilidade de recursos (20,80%) foram os mais relatados. Conclusão: grande parte dos profissionais atua indicando o oxigênio suplementar em situações em que há SaO2 < 90%, realizando avaliação à beira leito da cânula nasal de alto fluxo por meio do índice ROX e indicando intervenção fisioterapêutica.


Objective: this study aimed to understand the experience of physiotherapists with patients hospitalized under oxygen therapy, as well as to identify the challenges experienced during their intervention. Methods: it was a quantitative and cross-sectional study conducted from September 2021 to March 2022, with physiotherapists working in hospitals in Fortaleza-CE. Data collection was performed in person and virtually through the Google Forms platform, through a questionnaire with objective questions about experience, intervention, and challenges during care to patients under oxygen therapy. The collected data were stored in Microsoft Excel® 2010 and analyzed by SPSS® version 20.0, using descriptive statistics. Results: the study included 101 physical therapists, 76.2% female, and 45.5% of the participants had graduated for five years. Of these, 83.2% of physical therapists stated that SpO2 < 90% is indicative of oxygen therapy. The majority (79.2%) disagreed with the use of the venturi mask for patients with Covid-19 and pointed to the high-flow nasal cannula (39.6%) and the non-reinlantreservoir mask (40.6%) as the most used. Among the challenges faced during care, interaction with the interdisciplinary team (25.70%), weaning from oxygen therapy (21.80%), and unavailability of resources (20.80%) was the most reported. Conclusion: most professionals indicate supplemental oxygen in situations where SaO2 < 90%, perform an evaluation at the bedside of the high-flow nasal cannula from the ROX index and suggest physiotherapeutic intervention.


Subject(s)
Oxygen Inhalation Therapy , Lung Injury , Hospital Care , Physical Therapists , COVID-19 , Hypoxia
5.
Rev. ADM ; 79(4): 224-231, jul.-ago. 2022.
Article in Spanish | LILACS | ID: biblio-1396483

ABSTRACT

La OMS cataloga al cáncer como uno de los principales problemas en el ámbito mundial, los pacientes sometidos a terapia oncológica son más vulnerables a desarrollar complicaciones en los tejidos de la cavidad bucal entre las que tenemos: mucositis, infecciones, osteorradionecrosis. En el manejo endodóntico hay que tomar en consideración que los trata- mientos como yodoterapia, radioterapia y quimioterapia pueden generar efectos sobre el complejo dentinopulpar. El objetivo de este artículo es determinar el estatus del tejido pulpar postratamiento oncológico mediante la revisión sistemática en bases de datos de gran relevancia científica, como PubMed, Scielo, Medigraphic, Science direct. Se concluye que el sistema estomatognático es un receptor importante de estos efectos y secuelas en pacientes con terapia oncológica, el tejido pulpar no está libre de estas secuelas ya que genera daño celular, como la hipovascularidad, hipocelularidad e hipoxia la cual incrementa el riesgo de necrosis de la región (AU)


The WHO lists cancer as one of the main problems worldwide, patients undergoing oncological therapy are more vulnerable to developing complications in the tissues of the oral cavity among which we have: mucositis, infections, osteoradionecrosis. In endodontic management, it should be taken into consideration that treatments such as iodine therapy, radiotherapy, and chemotherapy can generate effects on the dentin-pulp complex. This article aims to determine the status of the pulp tissue after oncologic treatment. Through a systematic review in databases of great scientific relevance, such as PubMed, Scielo, Medigrafhic, Science direct. It is concluded that the stomatognathic system is an important receptor of these effects and sequelae in patients with oncological therapy, the pulp tissue is not free of these sequelae as it generates cellular damage because of the hypo vascularity, hypocellularity, and hypoxia which increases the risk of necrosis of the region (AU)


Subject(s)
Humans , Radiotherapy/adverse effects , Dental Pulp/physiopathology , Dental Pulp Diseases/etiology , Drug-Related Side Effects and Adverse Reactions , Neoplasms/complications , Osteonecrosis , Mucositis , Hypoxia
6.
Prensa méd. argent ; 108(6): 327-331, 20220000. tab
Article in English | LILACS, BINACIS | ID: biblio-1397211

ABSTRACT

La normalización del nivel de LDH en sangre se asocia con una mejor supervivencia en muchos estudios realizados en adultos, en niños y recién nacidos. El estudio tuvo como objetivo estimar la LDH para diferentes grupos de edad de pediatría. Se realizó un estudio observacional en Pediatrics Ward, Hospital General de Abu Ghraib, de enero de 2018 a diciembre de 2019. La muestra de estudio incluyó a 250 niños, su edad osciló entre 1 día y 16 años. Se calcularon los niños de ambos género con estos grupos de edad admitidos en Ward, y se calcularon LDH en sangre. La historia materna, la fiebre, la infección umbilical, la sollozo, la hipoxia, la sepsis y el síndrome de dificultad respiratoria (RDS) se documentaron en consecuencia. LDH medido como siguió: Recién nacido: 160 a 450 unidades por litro (unidades/L) y niño: 60 a 170 unidades/l. Dividimos la muestra a dos grupos, bebés recién nacidos (1 día a 1 año) y CHID (> 1 año a 16 años), y se documentaron las variables de estudio. La correlación de concentración y variables de LDH calculada. Se confirma el valor pronóstico del monitoreo de LDH en suero en serie para predecir la morbilidad y la mortalidad en los niños enfermos. Hay una correlación, aunque muy clara, entre los niveles de LDH en plasma con infección, asfixia y RDS


Normalisation of blood LDH level is associated with improved survival in many studies conducted in adults, in children and neonate. The study aimed to estimate the LDH for different pediatrics age groups. An observational study was conducted at Pediatrics ward, Abu Ghraib General Hospital, from January 2018 to December 2019. Study sample included 250 children; their age ranged from 1 day to 16 years. Children of both gender with these age groups admitted to ward, and blood LDH were calculated. The maternal history, fever, umbilical infection, SOB, hypoxia, sepsis, and respiratory distress syndrome (RDS) were documented accordingly. LDH measured as followed: New born: 160 to 450 units per litre (units/L) and child: 60 to 170 units/L. We divided sample to two-groups, newborn babies (1 day to 1 year) and chid (>1 year to 16 years), and the study variables were documented. The LDH concentration and variables correlation calculated. The prognostic value of serial serum LDH monitoring for predicting morbidity and mortality in sick children is confirmed. There is a correlation, although very clear, between the plasma LDH levels with infection, asphyxia, and RDS


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Respiratory Distress Syndrome, Newborn/prevention & control , Lactate Dehydrogenases , Hypoxia
8.
J. health med. sci. (Print) ; 8(1): 15-20, ene.-mar. 2022. tab
Article in English | LILACS | ID: biblio-1391822

ABSTRACT

The Chilean workforce has over 200,000 people that are intermittently exposed to altitudes over 4000 m. In 2012, the Ministry of Health provided a technical guide for high altitude workers that included a series of actions to mitigate the effects of hypoxia. Previous studies have shown the positive effect of oxygen enrichment at high altitudes. The Atacama Large Millimeter / submillimeter Arrays (ALMA) radiotelescope operate at 5,050 m (Array Operation Site, AOS) and is the only place in the world where Pressure Swing Adsorption (PSA) and Liquid Oxygen technologies have been installed at a large scale. Here we discuss our experience using oxygen supplementation at ALMA, to prevent the malaise and/or risks associated with exposure at 5,050 m. Antenna operators experienced chronic intermittent hypobaric hypoxia (CIHH, shiftwork 8 days HA*6 days rest SL) over 4 years. Studies to define normal O2 saturation values were performed in OSF and AOS by continuous recording during the shift. The outcomes showed no differences between production procedures (PSA or Liquid oxygen) in regulating oxygen availability at AOS facilities. As a result, big-scale installations have difficulties reaching the appropriate oxygen concentration due to leaks in high mobility areas. In addition, the PSA plant requires adequation and maintenance to operate at a very high altitude.


La fuerza laboral chilena cuenta con más de 200.000 personas que están expuestas intermitentemente a altitudes superiores a los 4000 m. En 2012, el Ministerio de Salud entregó una guía técnica para trabajadores de altura que incluía una serie de acciones para mitigar los efectos de la hipoxia. Estudios anteriores han demostrado el efecto positivo del enriquecimiento de oxígeno en altitudes elevadas. El radiotelescopio Atacama Large Millimeter/submillimeter Arrays (ALMA) opera a 5.050 m (Array Operation Site, AOS) y es el único lugar en el mundo donde se han instalado tecnologías de adsorción por cambio de presión (PSA) y oxígeno líquido a gran escala. Aquí discutimos nuestra experiencia usando suplementos de oxígeno en ALMA, para prevenir el malestar y/o los riesgos asociados con la exposición a 5.050 m. Los operadores de antena experimentaron hipoxia hipobárica intermitente crónica (CIHH, trabajo por turnos 8 días HA*6 días descanso SL) durante 4 años. Se realizaron estudios para definir valores normales de saturación de O2 en OSF y AOS mediante registro continuo durante el turno. Los resultados no mostraron diferencias entre los procedimientos de producción (PSA u oxígeno líquido) en la regulación de la disponibilidad de oxígeno en las instalaciones de AOS. Como resultado, las instalaciones a gran escala tienen dificultades para alcanzar la concentración de oxígeno adecuada debido a fugas en áreas de alta movilidad. Además, la planta de PSA requiere de adecuación y mantenimiento para operar a gran altura.


Subject(s)
Humans , Oxygen/administration & dosage , Hypoxia/physiopathology , Blood Pressure/physiology , Models, Molecular , Desert , Absorption , Altitude , Telescopes
9.
Article in Chinese | WPRIM | ID: wpr-941023

ABSTRACT

OBJECTIVE@#To investigate effects of physiological hypoxic conditions on suspension and adherence of embryoid bodies (EBs) during differentiation of human induced pluripotent stem cells (hiPSCs) and explore the underlying mechanisms.@*METHODS@#EBs in suspension culture were divided into normoxic (21% O2) and hypoxic (5% O2) groups, and those in adherent culture were divided into normoxic, hypoxic and hypoxia + HIF-1α inhibitor (echinomycin) groups. After characterization of the pluripotency with immunofluorescence assay, the hiPSCs were digested and suspended under normoxic and hypoxic conditions for 5 days, and the formation and morphological changes of the EBs were observed microscopically; the expressions of the markers genes of the 3 germ layers in the EBs were detected. The EBs were then inoculated into petri dishes for further culture in normoxic and hypoxic conditions for another 2 days, after which the adhesion and peripheral expansion rate of the adherent EBs were observed; the changes in the expressions of HIF-1α, β-catenin and VEGFA were detected in response to hypoxic culture and echinomycin treatment.@*RESULTS@#The EBs cultured in normoxic and hypoxic conditions were all capable of differentiation into the 3 germ layers. The EBs cultured in hypoxic conditions showed reduced apoptotic debris around them with earlier appearance of cystic EBs and more uniform sizes as compared with those in normoxic culture. Hypoxic culture induced more adherent EBs than normoxic culture (P < 0.05) with also a greater outgrowth rate of the adherent EBs (P < 0.05). The EBs in hypoxic culture showed significantly up-regulated mRNA expressions of β-catenin and VEGFA (P < 0.05) and protein expressions of HIF-1 α, β-catenin and VEGFA (P < 0.05), and their protein expresisons levels were significantly lowered after treatment with echinomycin (P < 0.05).@*CONCLUSION@#Hypoxia can promote the formation and maturation of suspended EBs and enhance their adherence and post-adherent proliferation without affecting their pluripotency for differentiation into all the 3 germ layers. Our results provide preliminary evidence that activation of HIF-1α/β-catenin/VEGFA signaling pathway can enhance the differentiation potential of hiPSCs.


Subject(s)
Echinomycin/metabolism , Embryoid Bodies/metabolism , Humans , Hypoxia/metabolism , Induced Pluripotent Stem Cells/metabolism , beta Catenin/metabolism
10.
Journal of Integrative Medicine ; (12): 365-375, 2022.
Article in English | WPRIM | ID: wpr-939894

ABSTRACT

OBJECTIVE@#Qili Qiangxin (QLQX), a compound herbal medicine formula, is used effectively to treat congestive heart failure in China. However, the molecular mechanisms of the cardioprotective effect are still unclear. This study explores the cardioprotective effect and mechanism of QLQX using the hypoxia-reoxygenation (H/R)-induced myocardial injury model.@*METHODS@#The main chemical constituents of QLQX were analyzed using high-performance liquid chromatography-evaporative light-scattering detection. The model of H/R-induced myocardial injury in H9c2 cells was developed to simulate myocardial ischemia-reperfusion injury. Apoptosis, autophagy, and generation of reactive oxygen species (ROS) were measured to assess the protective effect of QLQX. Proteins related to autophagy, apoptosis and signalling pathways were detected using Western blotting.@*RESULTS@#Apoptosis, autophagy and the excessive production of ROS induced by H/R were significantly reduced after treating the H9c2 cells with QLQX. QLQX treatment at concentrations of 50 and 250 μg/mL caused significant reduction in the levels of LC3II and p62 degradation (P < 0.05), and also suppressed the AMPK/mTOR signalling pathway. Furthermore, the AMPK inhibitor Compound C (at 0.5 μmol/L), and QLQX (250 μg/mL) significantly inhibited H/R-induced autophagy and apoptosis (P < 0.01), while AICAR (an AMPK activator, at 0.5 mmol/L) increased cardiomyocyte apoptosis and autophagy and abolished the anti-apoptotic effect of QLQX. Similar phenomena were also observed on the expressions of apoptotic and autophagic proteins, demonstrating that QLQX reduced the apoptosis and autophagy in the H/R-induced injury model via inhibiting the AMPK/mTOR pathway. Moreover, ROS scavenger, N-Acetyl-L-cysteine (NAC, at 2.5 mmol/L), significantly reduced H/R-triggered cell apoptosis and autophagy (P < 0.01). Meanwhile, NAC treatment down-regulated the ratio of phosphorylation of AMPK/AMPK (P < 0.01), which showed a similar effect to QLQX.@*CONCLUSION@#QLQX plays a cardioprotective role by alleviating apoptotic and autophagic cell death through inhibition of the ROS/AMPK/mTOR signalling pathway.


Subject(s)
AMP-Activated Protein Kinases/metabolism , Apoptosis , Autophagic Cell Death , Autophagy , Drugs, Chinese Herbal , Herbal Medicine , Humans , Hypoxia/metabolism , Myocytes, Cardiac/metabolism , Reactive Oxygen Species/metabolism , TOR Serine-Threonine Kinases/metabolism
11.
Article in English | WPRIM | ID: wpr-939770

ABSTRACT

OBJECTIVE@#To detect whether Danlou Tablet (DLT) regulates the hypoxia-induced factor (HIF)-1α-angiopoietin-like 4 (Angptl4) mRNA signaling pathway and explore the role of DLT in treating chronic intermittent hypoxia (CIH)-induced dyslipidemia and arteriosclerosis.@*METHODS@#The mature adipocytes were obtained from 3T3-L1 cell culturation and allocated into 8 groups including control groups (Groups 1 and 5, 0.1 mL of cell culture grade water); DLT groups (Groups 2 and 6, 0.1 mL of 1,000 µg/mL DLT submicron powder solution); dimethyloxalylglycine (DMOG) groups (Groups 3 and 7, DMOG and 0.1 mL of cell culture grade water); DMOG plus DLT groups (Groups 4 and 8, DMOG and 0.1 mL of 1,000 µg/mL DLT submicron powder solution). Groups 1-4 used mature adipocytes and groups 5-8 used HIF-1 α-siRNA lentivirus-transfected mature adipocytes. After 24-h treatment, real-time polymerase chain reaction and Western blot were employed to determine the mRNA and protein expression levels of HIF-1 α and Angptl4. In animal experiments, the CIH model in ApoE-/- mice was established. Sixteen mice were complete randomly divided into 4 groups including sham group, CIH model group [intermittent hypoxia and normal saline (2 mL/time) gavage once a day]; Angptl4 Ab group [intermittent hypoxia and Angptl4 antibody (30 mg/kg) intraperitoneally injected every week]; DLT group [intermittent hypoxia and DLT (250 mg/kg) once a day], 4 mice in each group. After 4-week treatment, enzyme linked immunosorbent assay was used to detect the expression levels of serum total cholesterol (TC) and triglyceride (TG). Hematoxylin-eosin and CD68 staining were used to observe the morphological properties of arterial plaques.@*RESULTS@#Angptl4 expression was dependent on HIF-1 α, with a reduction in mRNA expression and no response in protein level to DMOG or DLT treatment in relation to siHIF-1 α -transfected cells. DLT inhibited HIF-1 α and Angptl4 mRNA expression (P<0.05 or P<0.01) and reduced HIF-1 α and Angptl4 protein expressions with DMOG in mature adipocytes (all P<0.01), as the effect on HIF-1 α protein also existed in the presence of siHIF-1 α (P<0.01). ApoE-/- mice treated with CIH had increased TG and TC levels (all P<0.01) and atherosclerotic plaque. Angptl4 antibody and DLT both reduce TG and TC levels (all P<0.01), as well as reducing atherosclerotic plaque areas, narrowing arterial wall thickness and alleviating atherosclerotic lesion symptoms to some extent.@*CONCLUSION@#DLT had positive effects in improving dyslipidemia and arteriosclerosis by inhibiting Angptl4 protein level through HIF-1 α-Angptl4 mRNA signaling pathway.


Subject(s)
Angiopoietin-Like Protein 4/genetics , Animals , Apolipoproteins E , Atherosclerosis/metabolism , Drugs, Chinese Herbal , Dyslipidemias/genetics , Hypoxia/metabolism , Hypoxia-Inducible Factor 1, alpha Subunit/metabolism , Mice , Plaque, Atherosclerotic , Powders , RNA, Messenger/genetics , Signal Transduction , Triglycerides , Water
12.
Article in Chinese | WPRIM | ID: wpr-928725

ABSTRACT

OBJECTIVE@#To explore the effect of hypoxia on the chemosensitivity of B-acute lymphoblastic leukemia (B-ALL) cells to Vincristine (VCR) and the mechanisms.@*METHODS@#B-ALL cells SUP-B15, Nalm-6 and RS4;11 were selected as the research objects. The cells were divided into the control group and the hypoxia mimic group (CoCl2 pretreatment). The two groups were treated with VCR at different concentrations for 24 hours, CCK-8 was used to detect cell viability, flow cytometry was used to detect cell apoptosis, and Western bolt method was used to detect hypoxia inducible factor (HIF-1α), BAX, Bcl-2 and β-actin protein expression. Quantitative real-time fluorescent PCR (qRT-PCR) was used to detect BAX and β-actin mRNA levels.@*RESULTS@#CoCl2 could simulate hypoxic environment to induce the expression of HIF-1α. The cells SUP-B15 and RS4;11 of the hypoxia mimic group were lower sensitivity to VCR as compared with the control group; the apoptosis rate of the hypoxia mimic group was lower than that of the control group after 80 nmol/L VCR treatment. The expression levels of BAX protein and mRNA in the hypoxia mimic group were lower than those of the control group, and there was no significant difference in the expression levels of Bcl-2 protein between two groups.@*CONCLUSION@#Under hypoxic conditions, HIF-1α may mediate VCR resistance in B-ALL cells by downregulating the pro-apoptotic protein BAX.


Subject(s)
Actins/pharmacology , Apoptosis , Cell Hypoxia , Humans , Hypoxia , Hypoxia-Inducible Factor 1, alpha Subunit , Proto-Oncogene Proteins c-bcl-2 , RNA, Messenger , Vincristine/pharmacology , bcl-2-Associated X Protein/pharmacology
13.
Article in Chinese | WPRIM | ID: wpr-928022

ABSTRACT

This study investigated the effect of salidroside on phenotypic transformation of rat pulmonary artery smooth muscle cells(PASMCs) induced by hypoxia. Rat pulmonary arteries were isolated by tissue digestion and PASMCs were cultured. The OD values of cells treated with salidroside at different concentrations for 48 hours were measured by cell counting kit-8(CCK-8) to determine the appropriate concentration range of salidroside. The cells were divided into a normal(normoxia) group, a model(hypoxia) group, and three hypoxia + salidroside groups(40, 60, and 80 μg·mL~(-1)). Quantitative real-time PCR(qRT-PCR) was used to detect the mRNA expression of cell contractile markers in each group, such as α-smooth muscle actin(α-SMA), smooth muscle 22(SM22), and calcium-binding protein(calponin), and synthetic marker vimentin. The expression levels of cell phenotypic markers and proliferating cell nuclear antigen(PCNA) were detected by Western blot. The proliferation of cells in each group was detected by the 5-ethynyl-2'-deoxyuridine(EdU) assay. Cell migration was measured by Transwell assay. As revealed by results, compared with the normal group, the model group showed decreased mRNA and protein expression of contractile phenotypic markers of PASMCs and increased mRNA and protein expression of synthetic markers. Compared with the conditions in the model group, salidroside could down-regulate the mRNA and protein expression of synthetic markers in PASMCs and up-regulated the mRNA and protein expression of contractile phenotypic markers. Compared with the normal group, the model group showed potentiated proliferation and migration. Compared with the model group, the hypoxia + salidroside groups showed blunted proliferation and migration of cells after phenotypic transformation. The results suggest that salidroside can inhibit the expression of synthetic markers in PASMCs and promote the expression of contractile markers to inhibit the hypoxia-induced phenotypic transformation of PASMCs. The mechanism of salidroside in inhibiting the proliferation and migration of PASMCs is related to the inhibition of the phenotypic transformation of PASMCs.


Subject(s)
Animals , Cell Proliferation , Cells, Cultured , Glucosides , Hypoxia , Myocytes, Smooth Muscle , Phenols , Pulmonary Artery , Rats
14.
Article in Chinese | WPRIM | ID: wpr-927900

ABSTRACT

Objective: To investigate the mechanism that hypoxia promotes the migration of lung adenocarcinoma A549 cells. Methods: A549 cells were cultured and cells that knockdown of acetyl-CoA carboxylase 1 (ACC1) were obtained by transfection with lentivirus, and cells that knockdown of sterol regulatory element-binding proteins-1 (SREBP-1) were obtained by treated with si-RNA. A549 cells were treated with hypoxia combined with hypoxia inducible factor-1α (HIF-1α) inhibitor PX-478 (25 μmol); Hypoxia combined with linoleic acid (LA) (20 μmol) treated A549 cells with ACC1 knockdown, and A549 cells with SREBP-1 knockdown were treated by hypoxia. Transwell migration assay was used to detect cell migration. Western blot was conducted to detect HIF-1α, ACC1 and epithelial mesenchymal transition (EMT) related proteins, Vimentin, E-Cadherin and SREBP-1; Real-time fluorescent quantitative polymerase chain reaction (RT-qPCR) was performed to detect the changes of ACC1 and SREBP-1 mRNA in A549 cells after hypoxia and HIF-1α inhibitor PX-478 (25 μmol) treatment. Each experiment was repeated three times. Results: Compared with the normoxic control group, hypoxia promoted the migration of A549 cells (P<0.01), and up-regulated the expressions of ACC1, HIF-1α (all P<0.01) and SREBP-1 (P<0.05). PX-478 (25 μmol) inhibited the migration of A549 cells induced by hypoxia and down-regulated the expression of SREBP-1 (all P<0.05). ACC1 mRNA and SREBP-1 mRNA levels were increased after hypoxia treatment of A549 cells (all P<0.05). The levels of ACC1 mRNA and SREBP-1 mRNA were decreased after A549 cells treated with hypoxia combined with PX-478 (25 μmol) for 24 h (P<0.05, P<0.01). Knockdown of SREBP-1 in A549 cells was obtained by transfection with si-RNA. Transwell migration assay showed the number of cell migration in si-SREBP-1 group was less than that in normoxia control group (P<0.01). The si-SREBP-1 group and the si-NC group were treated with hypoxia. Compared with the control group, the number of cell migration in the si-SREBP-1 group was decreased (P<0.01), however, the difference was not statistically significant compared with the normoxia si-SREBP-1 group (P>0.05). Western blot showed that the expression of ACC1 in the si-SREBP-1 group was lower than that in the control group (P<0.01). Compared with the control group, the expression of ACC1 was decreased after si-SREBP-1 group treated with hypoxia (P<0.01). Knockdown of ACC1 inhibited the migration of A549 cells (P<0.05). After knockdown of ACC1, the migration number of A549 cells under normoxia and 5% O2 conditions had no significant difference (P>0.05). Application of LA under hypoxia condition rescued ACC1-knockdown induced inhibitory effect on hypoxia-promoted A549 cell migration (P<0.05). Conclusion: Hypoxia promotes migration of lung adenocarcinoma A549 cells by regulating fatty acid metabolism through HIF-1α/SREBP-1/ACC1 pathway.


Subject(s)
A549 Cells , Acetyl-CoA Carboxylase , Adenocarcinoma of Lung , Cell Hypoxia/physiology , Cell Line, Tumor , Humans , Hypoxia , Hypoxia-Inducible Factor 1, alpha Subunit , Lung Neoplasms , RNA/metabolism , RNA, Messenger/metabolism , Sterol Regulatory Element Binding Protein 1/metabolism
15.
Acta Physiologica Sinica ; (6): 145-154, 2022.
Article in Chinese | WPRIM | ID: wpr-927590

ABSTRACT

The aim of this study was to investigate the harmful effects of acute hypoxia on mouse cerebral cortex and hippocampus and the underlying mechanism. Mouse model of acute hypoxia was constructed by using a sealed glass jar. Laser speckle contrast imaging was used to detect the changes of cerebral blood flow after different time duration of hypoxia. Total superoxide dismutase (T-SOD) and malondialdehyde (MDA) assay kits were used to detect oxidative stress in cerebral cortex and hippocampus. Immunofluorescent staining was used to detect neuroinflammatory response of microglia in the cerebral cortex and hippocampus. One-step TUNEL method was used to detect neuronal apoptosis. The results showed that, compared with non-hypoxia (0 min hypoxia) group, 30 min hypoxia group exhibited decreased cerebral blood flow, higher percentage of CD68+/Iba1+ microglia, and increased neural apoptosis in the cerebral cortex and hippocampus. Compared with 30 min group, 60 min hypoxia group showed significantly decreased cerebral blood flow, increased MDA content in the cortex, as well as greater percentage of CD68+/Iba1+ microglia and neuronal apoptosis in the cerebral cortex and hippocampus. These results suggest that acute hypoxia damages brain tissue in a time-dependent manner and the oxidative stress and neuroinflammation are important mechanisms.


Subject(s)
Animals , Cerebral Cortex/metabolism , Hippocampus/metabolism , Hypoxia , Malondialdehyde , Mice , Oxidative Stress , Superoxide Dismutase/pharmacology
16.
Investig. enferm ; 24: 1-8, 20220000. b: 1Tab ; b: 1graf
Article in Spanish | LILACS, BDENF, COLNAL | ID: biblio-1411730

ABSTRACT

Introducción: la enfermedad por COVID-19 genera el síndrome de distrés respiratorio agudo, afecta la necesidad de oxigenación y demanda cuidados de enfermería para mantener la estabilidad hemodinámica y prevenir complicaciones respiratorias. Objetivo: analizar la evidencia científica sobre los cuidados de enfermería ante la necesidad de oxigenación en adultos hospitalizados con enfermedad por COVID-19. Métodos: revisión integrativa con un universo de 518 artículos científicos de 2020 y 2021 de las bases de datos: PubMed, Ebsco, Cuiden y ScienceDirect. Se analizaron seis (n= 6) estudios que abordan: ¿cuáles son los cuidados de enfermería ante la necesidad de oxigenación en adultos con enfermedad por COVID-19? Resultados: los cuidados de enfermería incluyen estrategias de oxigenoterapia, recomendaciones sobre el cuidado en la primera línea de atención, uso de oxígeno de alto flujo, posicionamiento prono despierto temprano, y control de saturación y de signos vitales mediante un proceso de atención en enfermería. Conclusión: los cuidados de enfermería satisfacen la necesidad de oxigenación mediante intervenciones de oxigenoterapia, control de comorbilidades y prevención de riesgos hospitalarios.


Introduction: COVID-19 disease generates acute respiratory distress syndrome, affects the need for oxygenation and demands nursing care to maintain hemodynamic stability and to prevent respiratory complications. Objective: To analyze the scientific evidence on nursing care facing the need for oxygenation in hospitalized adults with COVID-19 disease. Methods: Integrative review of a universe of 518 scientific articles published from 2020 to 2021 in the following databases: PubMed, EBSCO, CUIDEN and ScienceDirect. N=6 studies were analyzed. These address what the nursing care implies facing the need for oxygenation in adults with COVID-19. Results: Nursing care includes oxygen therapy strategies, recommendations on care in the first line of care, use of high-flow oxygen, early awake prone positioning, control of saturation and vital signs, through a nursing care process. Conclusion: Nursing care satisfies the need for oxygenation through oxygen therapy interventions, control of comorbidities and prevention of hospital risks.


Introdução: a doença Covid-19 gera síndrome do desconforto respiratório agudo, afeta a necessidade de oxigenação e demanda cuidados de enfermagem para manter a estabilidade hemodinâmica e prevenir complicações respiratórias. Objetivo: analisar as evidências científicas sobre o cuidado de enfermagem diante da necessidade de oxigenação em adultos hospitalizados com doença Covid-19. Métodos: revisão integrativa; universo 518 artigos científicos de 2020-21, nas bases de dados: PubMed, Ebsco, Cuiden e ScienceDirect. Foram analisados N=6 estudos que abordam quais são os cuidados de enfermagem diante da necessidade de oxigenação em adultos com Covid-19? Resultados: a assistência de enfermagem inclui estratégias de oxigenoterapia, recomendações sobre cuidados na primeira linha de cuidado, uso de oxigênio de alto fluxo, posicionamento prono acordado precocemente, controle da saturação e dos sinais vitais, por meio de um processo de cuidado de enfermagem. Conclusão: a assistência de enfermagem satisfaz a necessidade de oxigenação, por meio de intervenções de oxigenoterapia, controle de comorbidades e prevenção de riscos hospitalares.


Subject(s)
Humans , COVID-19 , Oxygenation , Hypoxia
17.
Bull. W.H.O. (Online) ; 105(5): 302-314, 2022. figures, tables
Article in English | AIM | ID: biblio-1373036

ABSTRACT

Objective To investigate survival in children referred from primary care in Malawi, with a focus on hypoglycaemia and hypoxaemia progression. Methods The study involved a prospective cohort of children aged 12 years or under referred from primary health-care facilities in Mchinji district, Malawi in 2019 and 2020. Peripheral blood oxygen saturation (SpO2) and blood glucose were measured at recruitment and on arrival at a subsequent health-care facility (i.e. four hospitals and 14 primary health-care facilities). Children were followed up 2 weeks after discharge or their last clinical visit. The primary study outcome was the case fatality ratio at 2 weeks. Associations between SpO2 and blood glucose levels and death were evaluated using Cox proportional hazards models and the treatment effect of hospitalization was assessed using propensity score matching. Findings Of 826 children recruited, 784 (94.9%) completed follow-up. At presentation, hypoxaemia was moderate (SpO2: 90­93%) in 13.1% (108/826) and severe (SpO2: < 90%) in 8.6% (71/826) and hypoglycaemia was moderate (blood glucose: 2.5­4.0 mmol/L) in 9.0% (74/826) and severe (blood glucose: < 2.5 mmol/L) in 2.3% (19/826). The case fatality ratio was 3.7% (29/784) overall but 26.3% (5/19) in severely hypoglycaemic children and 12.7% (9/71) in severely hypoxaemic children. Neither moderate hypoglycaemia nor moderate hypoxaemia was associated with mortality. Conclusion Presumptive pre-referral glucose treatment and better management of hypoglycaemia could reduce the high case fatality ratio observed in children with severe hypoglycaemia. The morbidity and mortality burden of severe hypoxaemia was high; ways of improving hypoxaemia identification and management are needed.


Subject(s)
Referral and Consultation , Blood Glucose , Hypoglycemia , Hypoxia
18.
Neumol. pediátr. (En línea) ; 17(2): 52-55, 2022. tab, ilus
Article in Spanish | LILACS | ID: biblio-1379486

ABSTRACT

La hiperplasia de células neuroendocrinas de la infancia (HCNEI) constituye una de las enfermedades intersticiales más frecuentes en pediatría. Tanto su etiología como los mecanismos fisiopatológicos involucrados son inciertos. Suele presentarse en pacientes por lo demás sanos, durante los primeros meses de vida con taquipnea, retracciones costales, rales e hipoxemia. En la tomografía axial computada de tórax de alta resolución (TACAR) presenta imágenes características en vidrio esmerilado de distribución central y zonas de atrapamiento aéreo. Para el diagnóstico, además de la clínica y la TACAR, podemos recurrir a la biopsia en casos atípicos. Los hallazgos histológicos reflejan una arquitectura pulmonar normal y un aumento en el número de células neuroendocrinas. El manejo global es con medidas de sostén, ya que no se cuenta con un tratamiento específico. La sintomatología suele mejorar con la edad y el pronóstico es favorable.


Neuroendocrine cell hyperplasia of infancy (NEHI) is one of the most common interstitial lung diseases of childhood. The etiology and pathophysiological mechanisms involved are uncertain. It usually presents in otherwise healthy patients during the first months of life with tachypnea, rib retractions, crackles, and hypoxemia. High-resolution chest computed tomography (HRCT) shows ground-glass opacities of central distribution and areas of air trapping. For diagnosis purposes, in addition to clinical and HRCT features, a lung biopsy is indicated for atypical cases. Histological findings reflect normal architecture and an increased number of neuroendocrine cells. The management consists of supportive and preventive care, since there is no specific treatment. Symptoms usually improve with age and the prognosis is favorable.


Subject(s)
Humans , Child , Lung Diseases, Interstitial/diagnosis , Lung Diseases, Interstitial/therapy , Neuroendocrine Cells/pathology , Tachypnea/etiology , Prognosis , Hyperplasia , Hypoxia/etiology
19.
Esc. Anna Nery Rev. Enferm ; 26: e20210203, 2022. tab
Article in Portuguese | LILACS, BDENF | ID: biblio-1356215

ABSTRACT

RESUMO Objetivo analisar as características individuais, clínicas e os fatores associados à mortalidade de pacientes com COVID-19, em hospital público do estado do Paraná, Brasil. Métodos estudo seccional, retrospectivo, documental (n= 86), com pacientes adultos internados, de março a junho de 2020. Resultados a mortalidade foi de 12,8%, o grupo de maior risco foi de idosos com comorbidades, especialmente, cardiovasculares. A chance de óbito foi 58 vezes maior em idosos, comparada aos adultos, e oito vezes maior naqueles com comorbidades, comparadas aos hígidos. A maioria dos pacientes apresentou sintomatologia respiratória, febre e mialgia. Tratamento à base de antibióticos, anticoagulantes e antivirais, associado ao suporte ventilatório. As principais complicações foram hipóxia, insuficiência renal aguda e infecção secundária. Conclusão e implicações para a prática idosos com comorbidades cardiovasculares que necessitaram de cuidados intensivos apresentaram maior chance de óbito. Os resultados de um dos centros de referência na pandemia possibilitam discutir medidas epidemiológicas adotadas, com ênfase em conceitos restritivos nos primeiros meses.


RESUMEN Objetivo analizar las características individuales, clínicas y los factores asociados a la mortalidad en pacientes con COVID-19 en un hospital público del estado de Paraná. Métodos estudio transversal, retrospectivo, documental (n = 86), con pacientes adultos hospitalizados, de marzo a junio de 2020. Resultados la mortalidad fue del 12,8%, grupo de mayor riesgo para los ancianos con comorbilidades, especialmente enfermedades cardiovasculares. La probabilidad de muerte fue 58 veces mayor en los ancianos en comparación con los adultos y ocho veces mayor en aquellos con comorbilidades en comparación con los sanos. La mayoría de los pacientes presentaban síntomas respiratorios, fiebre y mialgia. Tratamiento a base de antibióticos, anticoagulantes y antivirales, asociado al soporte ventilatorio. Las principales complicaciones fueron hipoxia, insuficiencia renal aguda e infección secundaria. Conclusión e implicaciones para la práctica los ancianos con comorbilidades cardiovasculares que requirieron cuidados intensivos tenían una mayor probabilidad de muerte. Los resultados de uno de los centros de referencia pandémica permiten discutir las medidas epidemiológicas adoptadas, con énfasis en conceptos restrictivos en los primeros meses.


ABSTRACT Objective to analyze the individual and clinical characteristics and the factors associated with mortality in patients with COVID-19, in a public hospital in the state of Paraná, Brazil. Methods a cross-sectional, retrospective, documentary study (n= 86), with adult inpatients, from March to June 2020. Results mortality was 12.8%, the highest risk group was the elderly with comorbidities, especially cardiovascular ones. The chance of death was 58 times higher in the elderly compared to adults, and eight times higher in those with comorbidities compared to the healthy ones. Most patients presented with respiratory symptoms, fever, and myalgia. Treatment was based on antibiotics, anticoagulants and antivirals, associated with ventilatory support. The main complications were hypoxia, acute renal failure, and secondary infection. Conclusion and implications for practice elderly people with cardiovascular comorbidities who required intensive care had a higher chance of death. The results from one of the reference centers in the pandemic make it possible to discuss epidemiological measures adopted, with emphasis on restrictive concepts in the first months.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Health Profile , COVID-19/mortality , Antiviral Agents/therapeutic use , Patients' Rooms , Brazil , Comorbidity , Retrospective Studies , Risk Factors , Azithromycin/therapeutic use , Cough , Dyspnea , Renal Insufficiency/complications , Fever , Interactive Ventilatory Support , Myalgia , COVID-19/therapy , Inpatients/statistics & numerical data , Intensive Care Units , Length of Stay/statistics & numerical data , Hypoxia/complications , Anticoagulants/therapeutic use
20.
Article in English | WPRIM | ID: wpr-929023

ABSTRACT

OBJECTIVES@#The plateau environment is characterized by low oxygen partial pressure, leading to the reduction of oxygen carrying capacity in alveoli and the reduction of available oxygen in tissues, and thus causing tissue damage. Cilostazol is a phosphodiesterase III inhibitor that has been reported to increase the oxygen release of hemoglobin (Hb) in tissues. This study aims to explore the anti-hypoxic activity of cilostazol and its anti-hypoxic effect.@*METHODS@#A total of 40 male BALB/C mice were randomly divided into a low-dose cilostazol (6.5 mg/kg) group, a medium-dose (13 mg/kg) group, a high-dose (26 mg/kg) group, and a control group. The atmospheric airtight hypoxia experiment was used to investigate the anti-hypoxic activity of cilostazol and to screen the optimal dosage. Twenty-four male Wistar rats were randomly divided into a normoxia control group, a hypoxia model group, an acetazolamide (22.33 mg/kg) group, and a cilostazol (9 mg/kg) group. After 3 days of hypoxia in the 4 010 m high altitude, blood from the abdominal aorta was collected to determine blood gas indicators, the levels of IL-6 and TNF-α in plasma were determined by enzyme-linked immunosorbent assay, and the levels of malondialdehyde (MDA), superoxide dismutase (SOD), and glutataione (GSH) were measured. The degree of pathological damage for rat tissues was observed with HE staining.@*RESULTS@#Compared with the control group, the survival time of mice in the low, medium, and high dose group of cilostazol was significantly prolonged, and the survival time of mice in the medium dose group was the longest, with an extension rate at 29.34%, so the medium dose was the best dose. Compared with the hypoxia model group, the P50 (oxygen partial pressure at Hb oxygen saturation of 50%) value of rats in the cilostazol group was significantly increased by 1.03%; Hb and Hct were significantly reduced by 8.46% and 8.43%, and the levels of IL-6 and TNF-α in plasma were reduced by 50.65% and 30.77%. The MDA contents in heart, brain, lung, liver, and kidney tissues were reduced by 37.12%, 29.55%, 25.00%, 39.34%, and 21.47%, respectively. The SOD activities were increased by 94.93%, 9.14%, 9.42%, 13.29%, and 20.80%, respectively. The GSH contents were increased by 95.24%, 28.62%, 28.57%, 20.80%, and 44.00%, respectively. The results of HE staining showed that compared with the hypoxia model group, cilostazol significantly improved the damage of heart, lung, and kidney tissues in rats after hypoxia.@*CONCLUSIONS@#Cilostazol can significantly improve the oxidative stress and inflammatory reaction caused by rapid altitude hypoxia, and it has a significant protective effect on tissue damage caused by hypoxia, suggesting that it has obvious anti-hypoxic activity.


Subject(s)
Altitude Sickness , Animals , Cilostazol/therapeutic use , Hypoxia/drug therapy , Interleukin-6/pharmacology , Male , Mice , Mice, Inbred BALB C , Oxidative Stress , Oxygen , Rats , Rats, Wistar , Superoxide Dismutase/metabolism , Tumor Necrosis Factor-alpha/pharmacology
SELECTION OF CITATIONS
SEARCH DETAIL