摘要
目的 :观察阳离子脂质体介导的胶质细胞源性神经营养因子 (GDNF)体内转基因对大鼠脊髓损伤 (SCI)后伤区脊髓前角运动神经元的影响。方法 :采用改良Nystr m法制备大鼠胸段脊髓后路压迫损伤模型 ,将阳离子脂质体DC Chol和重组质粒 pEGFP GDNFcDNA混合后直接注入大鼠损伤脊髓。利用RT PCR技术和荧光显微镜检测GDNF体内转基因的表达。应用尼氏染色、酶组织化学染色方法观察前角运动神经元死亡的数目和胆碱酯酶(CHE)及酸性磷酸酶 (ACP)的变化。结果 :1周后在注射局部GDNFmRNA和GDNF有较高表达。GDNF体内转基因早期 (1~ 4周 )SCI区前角运动神经元死亡的数目减少 ,CHE和ACP变化的幅度降低。结论 :GDNF体内转基因能减少脊髓不完全性损伤后引起的神经元坏死 ,阳离子脂质体介导GDNF体内转基因治疗创伤性SCI的方法是可行的。
Objective:To observe the effect of cationic liposome mediated GDNF gene transfer in vivo on spinal cord motoneurons after spinal cord injury (SCI) in adult rats.Method:The SCI model of acute spinal cord posterior compression was established according to the method of Nystrm, then The DC Chol liposomes and recombinant plasmid pEGFP GDNF cDNA complexes were injected into the injured spinal cord. The expression of GDNF cDNA for 1 week after injection was detected by RT PCR and fluorescence microscope. We observed the remaining motoneurons in anterior horn and the changes of cholinesterase (CHE) and acid phosphatase (ACP) activity by using Nissl and enzyme histochemistry staining.Result:RT PCR and Fluorescence observation confirmed the presence of expression of GDNF cDNA for 1 week after injection. It was shown that GDNF cDNA delivery reduced motoneurons death (1~4 week) and the changes of CHE and ACP activity in lesion cord.Conclusion:GDNF gene transfer in vivo may protect motoneurons from death induced by incompleted spinal cord injury. These results suggest that cationic liposome mediated delivery of GDNF cDNA might be a practical method for treating traumatic spinal cord injury.
出处
《中国脊柱脊髓杂志》
CAS
CSCD
2002年第2期112-115,共4页
Chinese Journal of Spine and Spinal Cord
基金
国家自然科学基金资助项目 (3 0 0 0 0 0 48)
国家重点基础研究"973"基金资助项目 (19990 5 40 0 5 )
全军"十五"青年基金课题 (0 1Q0 80 )
关键词
胶质细胞源性神经营养因子
脊髓损伤
神经元
阳离子脂质体
基因治疗
Glial cell line derived neurotrophic factor (GDNF)
Spinal cord injury
Motoneuron
Cationic liposome
Gene therapy