摘要
目的探讨脂肪来源干细胞(ADSC)移植对大鼠脑缺血后Notchl—D114信号通路的影响。方法65只SD大鼠按随机数字表法分为:假手术组(5只),MCAO组(20只),ADSC组(20只),ADSC+DAPT(叮分泌酶抑制剂)组(20只)。线栓法制备大鼠大脑中动脉栓塞(MCAO)模型,ADSC组及ADSC+DAPT组分别于造模成功后24h经侧脑室注入ADSC或含DAPT的ADSC,术后4、7、14、28d取脑,计数脑缺血周边区微血管数量,免疫荧光组织化学法、Western印迹法检测Notch1、D114、Hes1的表达。结果ADSC组大鼠各时间点脑缺血周边区的微血管密度(13.93±0.50,17.90±0.62,20.78±0.80,17.28±1.65)明显高于MCAO组(7.03±0.22,10.83±0.63,16.35±0.54。13.80±2.38)(P〈0.05)及ADSC+DAPT干预组(5.73±0.30,7.58±0.52,7.65±0.45,6.48±1.47)(P〈0.05);ADSC组大鼠Notchl、D114、Hesl表达水平在14d时达到高峰(2.52±0.22,4.52±0.36,2.62±0.05),较MCAO组(1.29±0.07,2.13±0.21,1.92±0.03)及ADSC+DAVI'干预组明显增高(1.16±0.10,1.68±0.18,1.04±0.04)(P〈0.05)。结论脂肪干细胞移植可能通过上调Notehl-D114信号通路的表达来促进大鼠脑缺血周边区血管新生。
Objective To investigate the effects of the transplantation of adipose-derived stem cells (ADSC) on the expression of Notchl-Dll4 signaling pathway in brains of rats with focal cerebral ischemia. Methods Sixty-five male adult Spragne-Dawley rats were randomly divided into 4 groups: sham-operated group, MCAO (occlusion of middle cerebral artery) group, ADSC-treated group and ADSC & DAPT-treated group. A permanent model of focal cerebral ischemia was established by modified Zea-Longa's method. At 24 hours post-MCAO, 1 × 10^6 DAPT-labeled ADSC ADSC-treated group and the same dose of ADSC were injected into the lateral ventricle of rats in the with DAPT ( γ secretase inhibitor, N-[ N-(3, 5- difluorophenacetyl)-L-alanyl]-S-phenylglycine t-butyl ester) to the rats in the ADSC & DAPT -treated group. Rats are sacrificed at 4, 7, 14 and 28 d post-MCAO. The amount of microvessels was quantified. And the levels of Notchl, DlI4 and Hesl were detected by Western blot and immunohistochemistry. Results The density of microvessels significantly increased in the ADSC group ( 13.93 ±0. 50, 17.90 ±0.62, 20.78 ±0. 80, 17.28 ± 1.65 ) versus the MCAO group (7.03 ± 0. 22, 10. 83 ±0. 63, 16. 35 ± 0. 54, 13.80 ± 2. 38) (P〈0. 05)and the ADSC + DAPT group (5.73 ±0. 30, 7.58 ±0. 52, 7. 65 ±0.45, 6. 48 ± 1.47) (P〈0.05). And compared with the MCAO group (1.29±0.07, 2. 13 ±0.21, 1.92 ±0.03) and the ADSC + DAPT group ( 1. 162 ± 0. 099, 1. 684 ± 0. 180, 1. 041± 0. 040 ), the expressions of Notchl, Dll4 and Hesl proteins were significantly up-regulated at 14d in the ADSC group ( 2. 52 ± 0. 22, 4. 52 ±0. 36, 2. 62± 0. 05 ) ( P 〈 0. 05 ). Conclusion The transplantation of ADSC can improve angiogenesis by up- regulating the post-MCAO expression of Notchl-Dll4 signaling pathway in rats.
出处
《中华医学杂志》
CAS
CSCD
北大核心
2011年第33期2348-2352,共5页
National Medical Journal of China
基金
福建省自然科学基金(2008J0282)
福建省医学创新课题(2011-CX-5)