RESUMO
PURPOSE: To evaluate if the perconditioning affects the antioxidant capacity in mesenteric ischemia and reperfusion injury. METHODS: Twenty-one Wistar rats were assigned into three groups, as follows: Sham, IR and rPER. The animals were subjected to mesenteric ischemia for 30 min. rPER consisted of three cycles of 5-min hindlimb ischemia followed by 5 min hindlimb perfusion at the same time to mesenteric ischemic period. After 5 minutes, blood and 5 cm of terminal ileum were harvested for thiobarbituric acid reactive substances (TBARS) and Trolox equivalent antioxidant capacity (TEAC) measurement. RESULTS: rPER technique was able to reduce intestinal tissue TBARS levels (p<0.0001), but no statistic difference was observed in blood levels between groups, although it was verified similar results in rPER and Sham group. rPER technique also enhanced TEAC levels in both blood (p = 0.0314) and intestinal tissue (p = 0.0139), compared to IR group. CONCLUSIONS: rPER appears as the most promising technique to avoid IR injury. This technique reduced TBARS levels in blood and intestinal tissue and promoted the maintenance of antioxidant defense in mesenteric acute injury.
Assuntos
Isquemia Mesentérica , Traumatismo por Reperfusão , Animais , Antioxidantes , Isquemia , Ratos , Ratos Wistar , Traumatismo por Reperfusão/prevenção & controleRESUMO
ABSTRACT Purpose: To evaluate if the perconditioning affects the antioxidant capacity in mesenteric ischemia and reperfusion injury. Methods: Twenty-one Wistar rats were assigned into three groups, as follows: Sham, IR and rPER. The animals were subjected to mesenteric ischemia for 30 min. rPER consisted of three cycles of 5-min hindlimb ischemia followed by 5 min hindlimb perfusion at the same time to mesenteric ischemic period. After 5 minutes, blood and 5 cm of terminal ileum were harvested for thiobarbituric acid reactive substances (TBARS) and Trolox equivalent antioxidant capacity (TEAC) measurement. Results: rPER technique was able to reduce intestinal tissue TBARS levels (p<0.0001), but no statistic difference was observed in blood levels between groups, although it was verified similar results in rPER and Sham group. rPER technique also enhanced TEAC levels in both blood (p = 0.0314) and intestinal tissue (p = 0.0139), compared to IR group. Conclusions: rPER appears as the most promising technique to avoid IR injury. This technique reduced TBARS levels in blood and intestinal tissue and promoted the maintenance of antioxidant defense in mesenteric acute injury.
Assuntos
Traumatismo por Reperfusão/prevenção & controle , Isquemia Mesentérica , Ratos Wistar , Isquemia , AntioxidantesRESUMO
Purpose To evaluate the effect of remote ischemic conditioning associated to N-acetylcysteine (NAC) on testicular ischemia∕reperfusion (I∕R) injury in rats. Methods Twenty-five adult male Wistar rats were randomly distributed into five experimental groups (n=5), as follows: Sham, I∕R, Perconditioning (PER), NAC and PER+NAC. Two-hour ischemia was induced by rotating the left testis 720° to clockwise direction, followed by 4 hours of reperfusion. Perconditioning was performed by three I/R cycles of 10 min each on the left limb, 30 min before reperfusion. N-acetylcysteine (150 mg∕kg) was administered 30 min before reperfusion. Results Statistical differences were observed in MDA levels between I/R group with all groups (p<0.01), in addition there was statistical difference between PER and Sham, and PER+ NAC groups (p<0.05) in plasma. Conclusions The protective effect of perconditioning isolated in the reduction of lipid peroxidation related to oxidative stress was demonstrated. However, when Perconditioning was associated with NAC, there was no protective effect against testicular injury of ischemia and reperfusion.
Assuntos
Acetilcisteína/farmacologia , Sequestradores de Radicais Livres/farmacologia , Precondicionamento Isquêmico/métodos , Estresse Oxidativo/efeitos dos fármacos , Traumatismo por Reperfusão , Testículo/irrigação sanguínea , Animais , Avaliação Pré-Clínica de Medicamentos , Masculino , Capacidade de Absorbância de Radicais de Oxigênio , Distribuição Aleatória , Ratos , Ratos Wistar , Testículo/efeitos dos fármacosRESUMO
Purpose To evaluate the effect of remote ischemic conditioning associated to N-acetylcysteine (NAC) on testicular ischemiareperfusion (IR) injury in rats. Methods Twenty-five adult male Wistar rats were randomly distributed into five experimental groups (n=5), as follows: Sham, IR, Perconditioning (PER), NAC and PER+NAC. Two-hour ischemia was induced by rotating the left testis 720° to clockwise direction, followed by 4 hours of reperfusion. Perconditioning was performed by three I/R cycles of 10 min each on the left limb, 30 min before reperfusion. N-acetylcysteine (150 mgkg) was administered 30 min before reperfusion. Results Statistical differences were observed in MDA levels between I/R group with all groups (p 0.01), in addition there was statistical difference between PER and Sham, and PER+ NAC groups (p 0.05) in plasma. Conclusions The protective effect of perconditioning isolated in the reduction of lipid peroxidation related to oxidative stress was demonstrated. However, when Perconditioning was associated with NAC, there was no protective effect against testicular injury of ischemia and reperfusion.(AU)
Assuntos
Animais , Ratos , Isquemia/veterinária , Doenças Testiculares/prevenção & controle , Doenças Testiculares/veterinária , Reperfusão/veterinária , Acetilcisteína/efeitos adversos , Acetilcisteína/uso terapêuticoRESUMO
Abstract Purpose To evaluate the effect of remote ischemic conditioning associated to N-acetylcysteine (NAC) on testicular ischemia∕reperfusion (I∕R) injury in rats. Methods Twenty-five adult male Wistar rats were randomly distributed into five experimental groups (n=5), as follows: Sham, I∕R, Perconditioning (PER), NAC and PER+NAC. Two-hour ischemia was induced by rotating the left testis 720° to clockwise direction, followed by 4 hours of reperfusion. Perconditioning was performed by three I/R cycles of 10 min each on the left limb, 30 min before reperfusion. N-acetylcysteine (150 mg∕kg) was administered 30 min before reperfusion. Results Statistical differences were observed in MDA levels between I/R group with all groups (p<0.01), in addition there was statistical difference between PER and Sham, and PER+ NAC groups (p<0.05) in plasma. Conclusions The protective effect of perconditioning isolated in the reduction of lipid peroxidation related to oxidative stress was demonstrated. However, when Perconditioning was associated with NAC, there was no protective effect against testicular injury of ischemia and reperfusion.
Assuntos
Animais , Masculino , Ratos , Acetilcisteína/farmacologia , Testículo/irrigação sanguínea , Traumatismo por Reperfusão , Sequestradores de Radicais Livres/farmacologia , Estresse Oxidativo/efeitos dos fármacos , Precondicionamento Isquêmico/métodos , Testículo/efeitos dos fármacos , Distribuição Aleatória , Ratos Wistar , Avaliação Pré-Clínica de Medicamentos , Capacidade de Absorbância de Radicais de OxigênioRESUMO
O presente artigo tem como objetivo revisar na literatura os principais aspectos relacionados a um ambiente de biotério de qualidade. Foi realizado levantamento bibliográfico na base de dados do MEDLINE, BIREME e LILACS. Não há dúvidas sobre as vantagens advindas da organização de redes de biotérios como uma forma de se contribuir para acelerar a melhoria da infraestrutura de biotérios e, portanto, contribuir para o fortalecimento das pesquisas na área da saúde e de ciências biológicas.
This article aims to review in the literature the main aspects related to a quality vivarium environment. A bibliographic survey was carried out in the MEDLINE database, BIREME and LILACS. We are sure about the advantages of the organization of animal biotery networks as a means of contributing to accelerate the improvement of animal vivarium infrastructure and thus contribute to the strengthening of research in the field of health and life sciences.
Assuntos
Animais , Ambiente Construído , Animais de Laboratório , Experimentação Animal , Qualidade Ambiental , Bases de Dados Bibliográficas , Ciência dos Animais de Laboratório/organização & administraçãoRESUMO
O presente artigo tem como objetivo revisar na literatura os principais aspectos relacionados a um ambiente de biotério de qualidade. Foi realizado levantamento bibliográfico na base de dados do MEDLINE, BIREME e LILACS. Não há dúvidas sobre as vantagens advindas da organização de redes de biotérios como uma forma de se contribuir para acelerar a melhoria da infraestrutura de biotérios e, portanto, contribuir para o fortalecimento das pesquisas na área da saúde e de ciências biológicas.(AU)
This article aims to review in the literature the main aspects related to a quality vivarium environment. A bibliographic survey was carried out in the MEDLINE database, BIREME and LILACS. We are sure about the advantages of the organization of animal biotery networks as a means of contributing to accelerate the improvement of animal vivarium infrastructure and thus contribute to the strengthening of research in the field of health and life sciences.(AU)