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[Protective effects of exogenous vitamin D on nerve injury in mice with cerebral ischemia/reperfusion].

OBJECTIVE
To investigate the effects of 1,25-dihydroxyvitamin D3 (1,25-VitD3) supplementation on cerebral injury after ischemia/reperfusion (I/R) in mice with middle cerebral artery occlusion (MCAO).


METHODS
Male C57BL6 mice were randomly divided into Sham group, Vehicle group and 1,25-VitD3 group, with 10 mice in each group. Vehicle group and 1,25-VitD3 group were given MCAO for 1 hour, and then killed after reperfusion for 24 hours. Mice in 1,25-VitD3 group were treated with 1,25-VitD3 at the dose of 100 ng/(kg·d) by injected intraperitoneally for 5 days before MCAO operation. Cerebral ischemic penumbra areas of each group were collected for TTC staining, RT-PCR, TTC staining and immunohistochemistry assay. The function defect of mice was evaluated by using neurological function score.


RESULTS
Compared with the sham group, the volume of cerebral infarction in Vehicle group was increased significantly, and the expressions of IL-6, IL-1beta and Gp91phox in brain tissues were increased significantly (P＜0.05); compared with Vehicle group, supplementation of 1,25-VitD3 reduced the volume of cerebral infarction by about 50% in I/R mice (P＜0.05), and the expressions of IL-6, IL-1beta and Gp91phox in brain tissues of 1,25-VitD3 group were decreased significantly (P＜0.05). The expression of Foxp3, a T-regulatory cell marker, was significantly increased in the brain of mice (P＜0.05), while the expression of Rorc, a transcription factor, was significantly decreased (P＜0.05), suggesting that Th17/gamma Delta T-cell response was reduced and the number of neutrophils in the brain injury site of mice was significantly reduced (P＜0.05).


CONCLUSION
Vitamin D could alleviate the development of cerebral infarction after arterial occlusion (MCAO) reperfusion, and its mechanism may be through regulating the inflammatory response in mouse brain I/R.