Molecular mechanisms of cerebral aneurysmal formation

脑动脉瘤的发病机制尚未完全了解。我们建立了实验性大鼠和小鼠脑动脉瘤模型，并分析了脑动脉瘤形成过程中的表达蛋白和信使rna。我们证实了在此过程中内皮中eNOS的减少和平滑肌中iNOS的增加，并证明了iNOS的抑制剂和iNOS基因的破坏抑制了动脉瘤的形成。我们还证实在此过程中活性MMP-2和9增加，敲除MMP-9可减少脑动脉瘤的形成。我们还通过PCR检测了与血管重构相关的特定分子的表达。最后，我们分析了在高度聚集的日本家族中与动脉瘤形成有高度连锁关系的候选基因。

The pathogenesis of cerebral aneurysm has not been-fully understood. We have developed experimental cerebral aneurysmal models in rats and mice and analyzed expressed proteins and messenger RNAs during the process of cerebral aneurismal formation. We confirmed the decrease in eNOS in the endothelium and increase in iNOS in the smooth muscle during the process, and demonstrated that an inhibitor of iNOS and the disruption of iNOS gene inhibited the aneurysmal formation. We also demonstrated increased active MMP-2 and 9 during the process and the knockout of MMP-9 decreased the formation of cerebral aneurysm. We also detected by PCR the expression of specific molecules which are related to vascular remodeling. Finally we analyzed the candidate genes which had high linkage to aneurysmal formation in highly-aggregated Japanese families.