Improvement in regional CBF by L-serine contributes to its neuroprotective effect in rats after focal cerebral ischemia.
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| Abstract |
To investigate the mechanisms underlying the neuroprotective effect of L-serine, permanent focal cerebral ischemia was induced by occlusion of the middle cerebral artery while monitoring cerebral blood flow (CBF). Rats were divided into control and L-serine-treated groups after middle cerebral artery occlusion. The neurological deficit score and brain infarct volume were assessed. Nissl staining was used to quantify the cortical injury. L-serine and D-serine levels in the ischemic cortex were analyzed with high performance liquid chromatography. We found that L-serine treatment: 1) reduced the neurological deficit score, infarct volume and cortical neuron loss in a dose-dependent manner; 2) improved CBF in the cortex, and this effect was inhibited in the presence of apamin plus charybdotoxin while the alleviation of both neurological deficit score and infarct volume was blocked; and 3) increased the amount of L-serine and D-serine in the cortex, and inhibition of the conversion of L-serine into D-serine by aminooxyacetic acid did not affect the reduction of neurological deficit score and infarct volume by L-serine. In conclusion, improvement in regional CBF by L-serine may contribute to its neuroprotective effect on the ischemic brain, potentially through vasodilation which is mediated by the small- and intermediate-conductance Ca(2+)-activated K(+) channels on the cerebral blood vessel endothelium.
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| Authors | Tao-Jie Ren, Ren Qiang, Zheng-Lin Jiang, Guo-Hua Wang, Li Sun, Rui Jiang, Guang-Wei Zhao, Le-Yang Han |
| Journal | PloS one (PLoS One) Vol. 8 Issue 6 Pg. e67044 ( 2013) ISSN: 1932-6203 [Electronic] United States |
| PMID | 23825613 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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