CDK4/6-inhibiting drug substitutes for p21 and p16 in senescence: duration of cell cycle arrest and MTOR activity determine geroconversion.

CDK4/6-inhibiting drug substitutes for p21 and p16 in senescence: duration of cell cycle arrest and MTOR activity determine geroconversion.
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DOI:
10.4161/cc.26130
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发表时间:
2013-09-15
期刊:
Cell cycle (Georgetown, Tex.)
影响因子:
--
通讯作者:
Blagosklonny MV
Blagosklonny MV
中科院分区:
其他
文献类型:
--
作者:
Leontieva OV;Blagosklonny MV

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CDKN1A (p21)和CDKN2A (p16)抑制CDK4/6,启动衰老。根据我们对衰老的看法,p21和p16的作用是引起细胞周期阻滞,而MTOR(雷帕霉素的机制靶点)驱动衰老转化为衰老。最近,我们证明了p21-和p16引发的衰老的标志之一是mek依赖性细胞周期蛋白D1的高升高。我们注意到一种合成的cdk4 /6抑制剂(PD0332991)也能诱导细胞周期蛋白d1阳性衰老。我们证明PD0332991和p21引起几乎相同的衰老表型。p21、p16和PD0332991不抑制MTOR,而雷帕霉素减慢了所有3种分子引起的老年转化。与p21一样,PD0332991在任何浓度下都能抑制细胞增殖,从而引发衰老。这证实了一种观点,即仅仅在活跃的MTOR存在的情况下停止就可能导致衰老。
CDKN1A (p21) and CDKN2A (p16) inhibit CDK4/6, initiating senescence. According to our view on senescence, the role of p21 and p16 is to cause cell cycle arrest, whereas MTOR (mechanistic target of rapamycin) drives geroconversion to senescence. Recently we demonstrated that one of the markers of p21- and p16-initiated senescence is MEK-dependent hyper-elevation of cyclin D1. We noticed that a synthetic inhibitor of CDK 4/6 (PD0332991) also induced cyclin D1-positive senescence. We demonstrated that PD0332991 and p21 caused almost identical senescence phenotypes. p21, p16, and PD0332991 do not inhibit MTOR, and rapamycin decelerates geroconversion caused by all 3 molecules. Like p21, PD0332991 initiated senescence at any concentration that inhibited cell proliferation. This confirms the notion that a mere arrest in the presence of active MTOR may lead to senescence.
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