Cellular senescence is a major process affected by multiple signals and coordinated by a complex signal response network.Identification of novel regulators of cellular senescence and elucidation of their molecular mec...Cellular senescence is a major process affected by multiple signals and coordinated by a complex signal response network.Identification of novel regulators of cellular senescence and elucidation of their molecular mechanisms will aid in the discoveryof new treatment strategies for aging-related diseases. In the present study, we identified human coilin-interacting nuclear ATPaseprotein (hCINAP) as a negative regulator of aging. Depletion of cCINAP significantly shortened the lifespan of Caenorhabditiselegans and accelerated primary cell aging. Moreover, mCINAP deletion markedly promoted organismal aging and stimulatedsenescence-associated secretory phenotype in the skeletal muscle and liver from mouse models of radiation-induced senescence.Mechanistically, hCINAP functions through regulating MDM2 status by distinct mechanisms. On the one hand, hCINAP decreasesp53 stability by attenuating the interaction between p14ARF and MDM2;on the other hand, hCINAP promotes MDM2 transcriptionvia inhibiting the deacetylation of H3K9ac in the MDM2 promoter by hindering the HDAC1/CoREST complex integrity. Collectively,our data demonstrate that hCINAP is a negative regulator of aging and provide insight into the molecular mechanisms underlyingthe aging process.展开更多
基金supported by the National Natural Science Foundation of China(82130081,32270756,and 81730080)the National Key Research and Development Program of China(2022YFA1302803)the Natural Science Foundation of Beijing Municipality(5212008).
文摘Cellular senescence is a major process affected by multiple signals and coordinated by a complex signal response network.Identification of novel regulators of cellular senescence and elucidation of their molecular mechanisms will aid in the discoveryof new treatment strategies for aging-related diseases. In the present study, we identified human coilin-interacting nuclear ATPaseprotein (hCINAP) as a negative regulator of aging. Depletion of cCINAP significantly shortened the lifespan of Caenorhabditiselegans and accelerated primary cell aging. Moreover, mCINAP deletion markedly promoted organismal aging and stimulatedsenescence-associated secretory phenotype in the skeletal muscle and liver from mouse models of radiation-induced senescence.Mechanistically, hCINAP functions through regulating MDM2 status by distinct mechanisms. On the one hand, hCINAP decreasesp53 stability by attenuating the interaction between p14ARF and MDM2;on the other hand, hCINAP promotes MDM2 transcriptionvia inhibiting the deacetylation of H3K9ac in the MDM2 promoter by hindering the HDAC1/CoREST complex integrity. Collectively,our data demonstrate that hCINAP is a negative regulator of aging and provide insight into the molecular mechanisms underlyingthe aging process.
文摘目的探讨乳酸脱氢酶A(LDH-A)与组蛋白去乙酰化酶1(HDAC1)在肠型胃癌中表达的相关性及其与预后的关系。方法应用Western blotting法检测HDAC1蛋白在慢病毒介导的LDH-A siRNA转染肠型胃癌细胞株SGC7901中表达的变化;应用免疫组织化学方法检测661例肠型胃癌组织及癌旁正常组织中LDH-A与HDAC1蛋白的表达情况并分析其表达与预后的关系。结果 Western blotting检测结果显示,LDH-A蛋白在SGC7901细胞株中的表达明显上调,且LDH-A的沉默可显著下调HDAC1的表达。肠型胃癌组织中LDH-A蛋白的高表达率为54.8%(362/661),明显高于癌旁正常组织的12.9%(85/661),两者差异有统计学意义(P<0.01);肠型胃癌组织中HDAC1的高表达率为51.3%(339/661),明显高于癌旁正常组织的15.4%(102/661),两者差异有统计学意义(P<0.01)。LDH-A与HDAC1蛋白在肠型胃癌组织中的表达呈正相关(r=0.324,P<0.001)。单因素生存分析结果显示,LDH-A与HDAC1均低表达患者的生存曲线明显优于其他组合(P<0.001);多因素生存分析结果显示LDH-A与HDAC1表达均为肠型胃癌独立的预后因素。结论在肠型胃癌中,LDH-A与HDAC1的表达呈正相关,采用LDH-A和HDAC1双靶点抑制治疗可能具有潜在的生存获益。
