2,3,5,4′-Tetrahydroxystilbene-2-O-β-D-Glucoside Attenuates Ischemia/Reperfusion-Induced Brain Injury in Rats by Promoting Angiogenesis

Abstract

Cerebral ischemia can cause brain infarcts, which are difficult to recover due to poor angiogenesis. 2,3,5,4′-Tetrahydroxystilbene-2-O-β-D-glucoside is a natural polyphenol, has antioxidant and anti-inflammatory activity, and can protect from ischemic neuronal injury. However, little is known about the effect of 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside on brain microcirculation after stroke. This study aimed at investigating the influence of 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside on brain lesions and angiogenesis after stroke. Sprague-Dawley rats were subjected to right middle cerebral artery occlusion and treated with vehicle, nimodipine, or different doses of 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside daily beginning at 6 h post-middle cerebral artery occlusion for 14 days. The volume of cerebral infarcts, degree of neurological dysfunction, and level of microvessel density were determined longitudinally. The levels of vascular endothelial growth factor, angiopoietin 1, and angiopoietin receptor-2 expression in the brain lesions were characterized by immunohistochemistry and Western blot assays at 14 days post-middle cerebral artery occlusion. We found that 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside significantly promoted postoperative recovery in rats by minimizing the volume of cerebral infarcts and improving neurological dysfunction in a dose- and time-dependent manner. Additionally, 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside significantly increased the microvessel density in the brain and upregulated CD31 expression in ischemic penumbra, relative to that in the control. Finally, treatment with 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside significantly upregulated the relative levels of vascular endothelial growth factor, angiopoietin 1, and angiopoietin receptor-2 expression in the brain lesions of rats. Therefore, these data indicated that 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside treatment promoted angiogenesis and recovery from ischemia/reperfusion-induced brain injury in rats.

Key words

Polygonum multiflorum - Polygonaceae - 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside - cerebral ischemia/reperfusion - angiogenesis

^* These authors contributed equally to this work.

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