BACKGROUND: Sufentanil is widely used in clinical anaesthesia because of its protective effects against ischaemia/reperfusion injury. Diabetes mellitus elevates the activity of glycogen synthase kinase-3β (GSK-3β), thereby increasing the permeability of mitochondrial transition pore. This study investigated the role of GSK-3β in ameliorating the cardioprotective effect of sufentanil post-conditioning in diabetic rats. METHODS: Streptozotocin-induced diabetic rats and age-matched non-diabetic rats were subjected to 30 min of ischaemia and 120 min of reperfusion. Five minutes before reperfusion, rats were administered one of the following: a vehicle, sufentanil (1 μg/kg), or a GSK-3β inhibitor SB216763 (0.6 mg/kg). Myocardial infarct size, cardiac troponin I, and the activity of GSK-3β were then assessed. RESULTS: Sufentanil post-conditioning significantly reduced myocardial infarct size in the non-diabetic, but not in diabetic rats. SB216763 reduced infarct size in both diabetic and non-diabetic animals. Sufentanil-induced phospho-GSK-3β was reduced 5 min after reperfusion in diabetic rats, but not in non-diabetic rats. CONCLUSIONS: Sufentanil treatment was ineffective in preventing against ischaemia/reperfusion in diabetic rats, which is associated with the activation of GSK-3β. Our results also suggest that direct inhibition of GSK-3β may provide a strategy to protect diabetic hearts against ischaemia/reperfusion injury.
BACKGROUND:Sufentanil is widely used in clinical anaesthesia because of its protective effects against ischaemia/reperfusion injury. Diabetes mellitus elevates the activity of glycogen synthase kinase-3β (GSK-3β), thereby increasing the permeability of mitochondrial transition pore. This study investigated the role of GSK-3β in ameliorating the cardioprotective effect of sufentanil post-conditioning in diabeticrats. METHODS:Streptozotocin-induced diabeticrats and age-matched non-diabeticrats were subjected to 30 min of ischaemia and 120 min of reperfusion. Five minutes before reperfusion, rats were administered one of the following: a vehicle, sufentanil (1 μg/kg), or a GSK-3β inhibitor SB216763 (0.6 mg/kg). Myocardial infarct size, cardiac troponin I, and the activity of GSK-3β were then assessed. RESULTS:Sufentanil post-conditioning significantly reduced myocardial infarct size in the non-diabetic, but not in diabeticrats. SB216763 reduced infarct size in both diabetic and non-diabetic animals. Sufentanil-induced phospho-GSK-3β was reduced 5 min after reperfusion in diabeticrats, but not in non-diabeticrats. CONCLUSIONS:Sufentanil treatment was ineffective in preventing against ischaemia/reperfusion in diabeticrats, which is associated with the activation of GSK-3β. Our results also suggest that direct inhibition of GSK-3β may provide a strategy to protect diabetic hearts against ischaemia/reperfusion injury.
Authors: Leonid N Maslov; Igor Khaliulin; Peter R Oeltgen; Natalia V Naryzhnaya; Jian-Ming Pei; Stephen A Brown; Yury B Lishmanov; James M Downey Journal: Med Res Rev Date: 2016-05-16 Impact factor: 12.944
Authors: Jake Russell; Eugene F Du Toit; Jason N Peart; Hemal H Patel; John P Headrick Journal: Cardiovasc Diabetol Date: 2017-12-04 Impact factor: 9.951