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[Neural pathway participates in protection of limb ischemic preconditioning against brain injuries induced by ischemia/reperfusion in rats].
- Source :
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Zhongguo ying yong sheng li xue za zhi = Zhongguo yingyong shenglixue zazhi = Chinese journal of applied physiology [Zhongguo Ying Yong Sheng Li Xue Za Zhi] 2007 Feb; Vol. 23 (1), pp. 19-23. - Publication Year :
- 2007
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Abstract
- Aim: To explore the role of femoral nerves section (FNS) on the protection of limb ischemic preconditioning (LIP) against cerebral ischemia/reperfusion injuries.<br />Methods: Model of brain ischemia induced by Four-vessel occlusion was used. LIP was performed by clamping the bilateral femoral arteries for 10 min 3 times in a interval of 10 min. Rats with vertebral arteries permanently occluded were divided into sham group, cerebral ischemic group, FNS + cerebral ischemic group, LIP + cerebral ischemic group, FNS + LIP + cerebral ischemic group. The changes of neural density (ND) in the CA1 hippocampus were observed 7d after the sham operation or brain ischemia under thionin staining. The expression of c-Fos in the CA1 hippocampus was measured 6 h after the sham operation or brain ischemia under immunohistochemistry method.<br />Results: Thionin staining revealed that serious neuronal damage was visualized in the CA1 hippocampus in both cerebral ischemic group and FNS + cerebral ischemic group as compared with sham group. LIP attenuated the neuronal damage of the CA1 subfield induced normally by cerebral ischemia/reperfusion, and ND in LIP + cerebral ischemic group was significantly higher than that in cerebral ischemic group (P < 0.01). But obvious neuronal damage of the CA1 subfield was found in FNS+ LIP + cerebral ischemic group, and ND was significantly decreased as compared with LIP + cerebral ischemic group (P < 0.01). These results suggested that the protection of LIP against cerebral ischemia/reperfusion injuries might be cancelled by preceding section of femoral nerve. It was found that there was almost no c-Fos expression in the CA1 hippocampus in sham group. Changes of c-Fos expression in the CA1 subfield in cerebral ischemic group were similar to that in sham group. But in LIP + cerebral ischemic group, c-Fos expression in the CA1 subfield was markedly increased and the number of positive cells and optical density of c-Fos expression were significantly higher than those in sham and cerebral ischemic group. c-Fos expression in the CA1 subfield was again decreased in FNS + LIP + cerebral ischemic group, and the number of positive cells and optical density of c-Fos expression were significantly lower than those in LIP + cerebral ischemic group.<br />Conclusion: Neural pathway participated in the protective effect of LIP on brain, and increased c-Fos expression in the CA1 hippocampus by LIP after cerebral ischemia/reperfusion, might be a part of neural pathway by which LIP induced brain ischemic tolerance.
Details
- Language :
- Chinese
- ISSN :
- 1000-6834
- Volume :
- 23
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Zhongguo ying yong sheng li xue za zhi = Zhongguo yingyong shenglixue zazhi = Chinese journal of applied physiology
- Publication Type :
- Academic Journal
- Accession number :
- 21171359