Role of calcitonin gene related peptide in rats with femoral fracture and brain injury
- VernacularTitle:大鼠脑外伤后降钙素基因相关肽对股骨骨折愈合过程的影响
- Author:
Shoujun WANG
;
Ping ZHAI
;
Shifu WANG
;
Liu ZHANG
- Publication Type:Journal Article
- Keywords:
Calcitonin gene related peptide;
Brain injury;
Fracture;
lmmunohistochemistry;
Radioimmunoassay
- From:
Chinese Journal of Emergency Medicine
2008;17(5):499-502
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the relationship between calcitonin gene related peptide(CGRP)and enhanced osteogencsis after brain injury by investigating the expression of CGRP in callas and the level of CGRP in serum of rats with brain injury and femoral fracture.Method The experiment was conducted in the Laboratory of Surgery,Affiliated Hospital of North Claim Coal Medical College.Totally 56 male Sprague-Dawley(SD)rats were divided randomly into 3 groups:fracture group(n=24),fracture with brain injury group(n=24)and normal control group(n=8).The parietal skull revealed,the bone windowwas opened,rats models of brain injury were established by falling freely,and rats models of fracture were established by cutting the right middle femur.The rats in normal control group were killed at the 21 days after operation,the rats in other two groups were killed at 7,14and 21 days after operation,respectively.The X-ray of femoral fracture was obtained,the CGRP concentration in serum was detected by mdioimmunoassay,and tissues at 5mm above and below the fracture were stained by HE and SP immtmohistochemistry to observe the expressions of CGRP and the fracture healing.The data were expressed as mean±SEM and ahalyzed with student't t test with SPSS,Results The serum levels of CGRP in fracture group were(91.58±28.67)ng/L,(102.46±27.95)ng/L,(86.54±24.13)ng/L at 7,14,21 days after operation,respectively,which were significantly higher than that in the control group.In fracture with brain injury group,the serum levels of CGRP(165.49±43.28)ng/L significantly increased at 7 days after operation,and compared with fracttwe group,there was significant difference.The serum levels of CGRP decreased at 14,21 days after operation,with 104.72±31.36)ng/L,(74.93±21.57)ng/L,respectively,and compared with fracture group,there was significant difference at 21 days.The mean optical density in callus of the fracture in brain injury group (0.496±0.108)were higher than that in the fracture group[(0.348±0.076)]at 7 days after operation(P＜0.01),but there were no significant difference on the 14 and 21 days.Conclusions CGRP may play a role in osteogenesis after brain injury.
