胶质瘤细胞对血脑屏障水通道表达的影响

目的:探索胶质瘤细胞对血脑屏障水通道表达的影响及其病理生理意义。方法:通过内皮细胞系与胶质细胞体外共培养的方法建立体外血脑屏障模型。利用重水及高效液相分析的方法观察胶质瘤细胞作用对血脑屏障水转运的影响。运用半定量RT-PCR的方法分析胶质瘤细胞作用后血脑屏障内皮细胞及胶质细胞水通道1和水通道4的表达变化。结果:胶质瘤细胞可以诱导血脑屏障内皮细胞水通道1的异常表达并降低胶质细胞水通道4的表达水平。同时,胶质瘤细胞明显增强了体外血脑屏障模型对水由内皮细胞腔面至基底面的扩散。结论:胶质瘤性脑水肿不一定是血浆等大分子物质通透性增加的结果。血脑屏障中水通道的表达变化是胶质瘤性脑水肿发生的重要分子机制。

Changes of aquaporin expression in blood- brain barrier induced by glioma cells

AIM: To investigate the effects of glioma cells on aquaporin expression in blood-brain barrier and their importance in pathophysiology. METHODS: A blood-brain barrier model was established by coculture of ECV304 and astrocytes in vitro . HPLC was used to determine the change of water transport of in vitro blood-brain barrier model after the influence of glioma cells. The expression levels of AQP1 and AQP4 were analyzed by semiquatitative RT-PCR. RESULTS: Glioma cells decreased expression level of AQP4 of astrocytes and induced abnormal expression of aquaporin-1 in endothelial cell line. The water transport of in vitro blood-brain barrier model from luminal side to abluminal side was increased after coculture with glioma cells. CONCLUSION: The vasogenic brain edema induced by glioma cells may not be the result of hyperpermeability of blood-brain barrier to macromolecules in plasma. The changes of aquaporin expression may be the molecular basis of brain edema induced by glioma cells.