大鼠大脑皮层星形胶质细胞体外培养改良方法的研究

A modified culture method for astrocytes from rat cortical tissue in vitro

摘要:

目的 改进大鼠大脑皮质星形胶质细胞(astrocyte, AS)的体外培养方法,为进一步研究奠定基础.方法 选取生后3 d的Sprague-Dawley大鼠的大脑皮层,常规分离纯化AS,低密度种植,培养箱中孵育1 h后换瓶,24 h后换液,细胞融合成单层后传代,传代后维持在含10%胎牛血清DMEM培养基中培养,并在长时期内不给予更换或补加培养液.采用 GFAP/DAPI免疫荧光法鉴定AS细胞.结果 体外培养的纯化大鼠大脑皮层AS,表现为细胞突起细长、胞体明显缩小、形态多样的纤维型AS,最后细胞突起之间相互连接形成AS网络.GFAP/DAPI免疫荧光染色结果示GFAP阳性细胞达98%以上.结论 大鼠大脑皮质AS的体外培养改良方法培养的AS体外形态、发育特点均与在体内AS基本一致,且纯度较高,为进一步进行AS的研究创造了条件.

Abstract:

Objective To evaluate the efficiency of a modified culture method for rat cerebral cortical astrocytes in vitro. Methods The astrocytes derived from the cerebral cortex of 3-day-old Sprague-Dawley rats were first purified as described previously, then the cells were replanted at a low density. The culture flask was changed after 1 hour and substratum was replaced after 24 hours. Cells were syncretized to a monolayer, followed by cell passage. After three passages the cells were cultured in DMEM medium containing 10% fetal serum for a long period. The derivation of the cells was identified by immunofluorescent staining with anti-GFAP polyclonal antibodies. Results A variety of morphologically distinct astrocytes with many long processes and small cell bodies were obtained. Finally an astrocytic network occurred through cellular process connections. The immunofluorescent staining demonstrated the percentage of GFAP-positive cells was above 98%. Conclusions The modified culture method for astrocytes from rat cerebral tissue is reliable, with a high purity. The cultured astrocytes have a similar morphological development to those in vivo.