2-APB restores the conditioning phenomenon in diabetic mice, exposed to cerebral ischaemia-reperfusion injury

INTRODUCTION: Diabetes abrogates the neuroprotection caused by ischaemic preconditioning (IPC) during cerebral ischaemia-reperfusion (CI/R) injury. The study investigates the involvement of Inositol 1,4,5-trisphosphate (IP3R) receptors in IPC-mediated neuroprotection during C/R injury in hyperglycaemic conditions. MATERIALS AND METHODS: Swiss Albino mice were administered with streptozotocin (STZ) to induce diabetes. Mice were exposed to CI/R injury via common carotid arteries occlusion (20 min) followed by reperfusion (24 h). For IPC, each mouse was exposed to three-1 min cycles of ischaemia and reperfusion, followed by CI/R injury. RESULTS: CI/R animals showed behavioural, biochemical, and histopathological alterations. IPC was observed to attenuate the CI/R-induced detrimental effects in the normoglycemic animals; however, IPC failed to provide neuroprotection in the hyperglycaemic mice. 2-Aminoethyl diphenyl borinate (inositol 1,4,5-trisphosphate receptor (IP3R) antagonist) administration in IPC hyperglycaemic mice restored the neuroprotective effects of IPC. CONCLUSION: This suggests the possible role of IP3R antagonism in IPC-mediated neuroprotection during CI/R injury in hyperglycaemic conditions.