降钙素基因相关肽对鼠局灶性脑梗死的预防和保护作用

目的　进一步探讨降钙素基因相关肽 (CGRP)对鼠局灶性脑梗死的脑细胞预防和保护作用。方法　采用光化学照射法致鼠局灶性脑梗死模型 ;用重量法评定脑水肿 ;采用Ohno、Bederson、LeWay的方法进行神经系统的评分 ;用TTC染色法观察鼠脑梗死部位和计算梗死体积。结果　CGRP对鼠局灶性脑梗死有明显的预防和保护作用 ,表现为神经系统评分好转 ,脑水肿减轻 ,梗死体积减小 ,而这种作用与给药时间、给药剂量和方式有关。即 1次投予CGRP(1 .33BU/gBW)没有显著作用 ,至少要连续给药 2天以上 ;CGRP对鼠局灶性脑梗死的保护作用在超过一定剂量后不再明显增加 ;在总剂量不变的情况下 ,较小剂量多次服用效果较好。结论　CGRP对鼠局灶性脑梗死有确切的预防和保护作用 ,对减轻脑水肿有良好的作用。但应掌握合适剂量

Preventive and protective effect of CGRP on focal cerebral infarction in rats

Objective To explore the preventive and protective effect of CGRP on focal cerebral infarction in rats.Methods Focal cerebral infarction model was made by photochemical reaction. The level of cerebral edema was assayed by measuring brain water content.Nervous system evaluation was scored by the method of Ohno, Bederson, LeWay standard. The volume of cerebral infarction and its location were determined by TTC staining.Results CGRP has significant preventive and protective effect to focal cerebral infarction which showed the nervous system scores took a favourable turn, brain edema descended and infarction volume reduced. This effect was related with the dose and the way of administration of CGRP. A single dose (1.33 BU/gBW) of CGRP didn't have significantly effective.It should be given for at least over 2 days. This protective effect did not increase when the dose increased to a certain level. As for the effect of the way of administration of CGRP, multiadministration of fewer doses CGRP was better while the total dose kept constantly.Conclusion CGRP has definite preventive and protective effect to focal cerebral infarction in rats.It has also better effective in inhibition of brain edema. However its dose should be confined in a proper level.