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| 1 | Glial cell-derived neurotrophic factor mRNA expression in a rat model of spinal cord injury following bone marrow stromal cell transplantation显示文摘BACKGROUND: Several animal experiments utilizing bone marrow stromal cell (BMSC) transplantation for the treatment of spinal cord injury have proposed a hypothesis that BMSC transplantation effects are associated with increased glial cell-derived neurotrophic factor (GDNF) expression. OBJECTIVE: To confirm the effects of BMSC transplantation on GDNF mRNA expression in rats with spinal cord injury by reverse transcription-polymerase chain reaction (RT-PCR). DESIGN, TIME AND SETTING: The present molecular, cell biology experiment was performed at the Key Laboratory of Children's Congenital Malformation, Ministry of Health of China & Department of Developmental Biology, Basic Medical College, China Medical University between March 2006 and May 2007. MATERIALS: Sixty healthy Wistar rats aged 2-4-months and of either gender were included in this study. Spinal cord injury was induced in all rats by hemisection of T9 on the left side. RT-PCR kits were purchased from TaKaRa Company, China. Type 9600 RCR amplifier was provided by PerkinElmer Company, USA. METHODS: Three rats were selected for BMSC culture and subsequent transplantation (after three passages). Of the remaining 57 rats, nine were selected for sham-operation (sham-operated group), where only the T9 spinal cord was exposed without hemisection. A total of 48 rats were randomly and evenly divided into BMSC transplantation and model groups. In the BMSC transplantation group, following spinal cord injury induction, each rat was administered a BMSC suspension through two injection sites selected on the gray and white matter boundary caudally and cephalically, seperately and near to injury site in the spinal cord. The model group received an equal volume of PBS through the identical injection sites. MAIN OUTCOME MEASURES: At 24 and 72 hours, as well as at 7 days, following spinal cord injury, the spinal cord at the T 9 segment was removed. Eight rats were allocated to each time point in the BMSC transplantation and model groups, with three rats allocated to the sham-operated group. GDNF mRNA expression was semiquantitatively analyzed by RT-PCR. RESULTS: The sham-operated group exhibited extremely low GDNF mRNA expression. GDNF mRNA expression significantly increased at 24 hours after spinal cord injury, reached a peak level at 72 hours, and slowly decreased thereafter. However, it remained higher than normal levels at 7 days (P < 0.05). At all time points following spinal cord injury, GDNF mRNA expression was significantly greater in the BMSC transplantation group than in the model group (P < 0.05). CONCLUSION: Transplantation of BMSCs into the injured spinal cord up-regulated GDNF mRNA expression, thereby promoting repair of the injured spinal cord. | Lei Li Gang Lu Yanfeng Wang Hong Gao XinXu Lunhao Bai Lunhao Bai Huan Wang | 2008 | Neural Regeneration Research2008，3，10： | 13 |
| 2 | 人工寒潮促发大鼠脑卒中发病前脑血管内皮细胞粘附分子的变化显示文摘【目的】探讨人工寒潮促发大鼠脑卒中发病前脑血管内皮细胞粘附分子(CAM)的变化。【方法】110只SD大鼠制成双肾双夹肾血管性高血压大鼠模型,分为寒潮和非寒潮两大组,再按血压水平各分为正常血压组、160~199、200~219和≥220 mmHg等4个亚组,寒潮箱处理3 d后(每亚组6只大鼠)取视交叉平面脑片,连续切片,每8张取1张切片作免疫组化检测血管内皮的VCAM-1、ICAM-1、P-选择素水平,视交叉平面剩余切片及其余脑片连续切片,HE染色,了解是否有卒中病灶。发生脑卒中者被剔出统计学分析。【结果】在<220 mmHg的各血压亚组,寒潮组各级脑血管的VCAM-1、ICAM-1、P-选择素的免疫组化阳性信号均比非寒潮组高;在≥220 mmHg血压亚组,寒潮组各级脑血管的上述指标的免疫组化阳性信号均比非寒潮组低;在非寒潮组,各级脑血管的3个指标的免疫组化阳性信号均随血压升高而升高;在寒潮组,各级脑血管的3个指标的免疫组化阳性信号也随血压升高而升高,然而在血压≥220 mmHg时转为降低。【结论】长期持续的高血压损害了脑血管内皮的调控功能,在寒潮等外因的诱导下易致脑卒中。 | 林健雯 施晓耕 解龙昌 刘春岭 黄如训 | 2009 | 中山大学学报(医学科学版)2009，30，6： | 6 |
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