National Human Genome Research Institute and National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Biochem Biophys Res Commun. 2010 May 28;396(2):359-63. doi: 10.1016/j.bbrc.2010.04.097. Epub 2010 Apr 24.
Cyclin-dependent kinase inhibitors, p21(Cip1) and p27(Kip1), are upregulated during vascular cell proliferation and negatively regulate growth of vascular cells. We hypothesized that absence of either p21(Cip1) or p27(Kip1) in apolipoprotein E (apoE)-deficiency may increase atherosclerotic plaque formation. Compared to apoE(-/-) aortae, both apoE(-/-)/p21(-/-) and apoE(-/-)/p27(-/-) aortae exhibited significantly more atherosclerotic plaque following a high-cholesterol regimen. This increase was particularly observed in the abdominal aortic regions. Deficiency of p27(Kip1) accelerated plaque formation significantly more than p21(-/-) in apoE(-/-) mice. This increased plaque formation was in parallel with increased intima/media area ratios. Deficiency of p21(Cip1) and p27(Kip1) accelerates atherogenesis in apoE(-/-) mice. These findings have significant implications for our understanding of the molecular basis of atherosclerosis associated with excessive proliferation of vascular cells.
细胞周期蛋白依赖性激酶抑制剂 p21(Cip1)和 p27(Kip1)在血管细胞增殖过程中上调,并负调控血管细胞的生长。我们假设载脂蛋白 E (apoE)-缺陷中 p21(Cip1)或 p27(Kip1)的缺失可能会增加动脉粥样硬化斑块的形成。与 apoE(-/-)主动脉相比,高脂饮食后 apoE(-/-)/p21(-/-)和 apoE(-/-)/p27(-/-)主动脉的动脉粥样硬化斑块明显更多。这种增加尤其出现在腹主动脉区域。与 p21(-/-)相比,p27(Kip1)缺失在 apoE(-/-)小鼠中显著加速了斑块形成。这种增加的斑块形成与内膜/中膜面积比的增加平行。p21(Cip1)和 p27(Kip1)的缺失加速了 apoE(-/-)小鼠的动脉粥样硬化形成。这些发现对我们理解与血管细胞过度增殖相关的动脉粥样硬化的分子基础具有重要意义。