OBJECTIVES: Mesenteric ischaemia/reperfusion (IR) may lead to liver mitochondrial dysfunction and multiple organ failure. We determined whether gut IR induces early impairment of liver mitochondrial oxidative activity and whether methylene blue (MB) might afford protection. DESIGN: Controlled animal study. MATERIALS AND METHODS: Rats were randomised into three groups: controls (n = 18), gut IR group (mesenteric ischaemia (60 min)/reperfusion (60 min)) (n = 18) and gut IR + MB group (15 mg kg(-1) MB intra-peritoneally) (n = 16). Study parameters were: serum liver function markers, blood lactate, standard histology and DNA fragmentation (apoptosis) on intestinal and liver tissue, maximal oxidative capacity of liver mitochondria (state 3) and activity of complexes II, III and IV of the respiratory chain measured using a Clark oxygen electrode. RESULTS: Gut IR increased lactate deshydrogenase (+982%), aspartate and alanine aminotransferases (+43% and +74%, respectively) and lactate levels (+271%). It induced segmental loss of intestinal villi and cryptic apoptosis. It reduced liver state 3 respiration by 30% from 50.1 ± 3 to 35.2 ± 3.5 μM O(2) min(-1) g(-1) (P < 0.01) and the activity of complexes II, III and IV of the mitochondrial respiratory chain. Early impairment of liver mitochondrial respiration was related to blood lactate levels (r(2) = 0.45). MB restored liver mitochondrial function. CONCLUSIONS: MB protected against gut IR-induced liver mitochondria dysfunction.
OBJECTIVES: Mesenteric ischaemia/reperfusion (IR) may lead to liver mitochondrial dysfunction and multiple organ failure. We determined whether gut IR induces early impairment of liver mitochondrial oxidative activity and whether methylene blue (MB) might afford protection. DESIGN: Controlled animal study. MATERIALS AND METHODS:Rats were randomised into three groups: controls (n = 18), gut IR group (mesenteric ischaemia (60 min)/reperfusion (60 min)) (n = 18) and gut IR + MB group (15 mg kg(-1) MB intra-peritoneally) (n = 16). Study parameters were: serum liver function markers, blood lactate, standard histology and DNA fragmentation (apoptosis) on intestinal and liver tissue, maximal oxidative capacity of liver mitochondria (state 3) and activity of complexes II, III and IV of the respiratory chain measured using a Clark oxygen electrode. RESULTS: Gut IR increased lactate deshydrogenase (+982%), aspartate and alanine aminotransferases (+43% and +74%, respectively) and lactate levels (+271%). It induced segmental loss of intestinal villi and cryptic apoptosis. It reduced liver state 3 respiration by 30% from 50.1 ± 3 to 35.2 ± 3.5 μM O(2) min(-1) g(-1) (P < 0.01) and the activity of complexes II, III and IV of the mitochondrial respiratory chain. Early impairment of liver mitochondrial respiration was related to blood lactate levels (r(2) = 0.45). MB restored liver mitochondrial function. CONCLUSIONS:MB protected against gut IR-induced liver mitochondria dysfunction.
Authors: Z Mansour; A L Charles; M Kindo; J Pottecher; T N Chamaraux-Tran; A Lejay; J Zoll; J P Mazzucotelli; B Geny Journal: Biomed Res Int Date: 2014-08-10 Impact factor: 3.411
Authors: Juan Morgaz; Sergio Ventura; Pilar Muñoz-Rascón; Rocio Navarrete; José Pérez; María Del Mar Granados; José Andrés Fernández-Sarmiento; Juan Manuel Domínguez; Verónica Molina; Rafael J Gómez-Villamandos; Rafael Zafra Journal: BMC Vet Res Date: 2020-02-12 Impact factor: 2.741
Authors: Carlos Henrique Marques Dos Santos; Doroty Mesquita Dourado; Baldomero Antonio Kato da Silva; Henrique Budib Dorsa Pontes; Euler de Azevedo-Neto; Giovanna Serra da Cruz Vendas; Ian de Oliveira Chaves; João Victor Cunha Miranda Journal: Arq Bras Cir Dig Date: 2017 Jul-Sep