Department of Biochemistry & Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
Aging Cell. 2022 Aug;21(8):e13676. doi: 10.1111/acel.13676. Epub 2022 Jul 23.
The goal of this study was to test the role cellular senescence plays in the increased inflammation, chronic liver disease, and hepatocellular carcinoma seen in mice null for Cu/Zn-Superoxide dismutase (Sod1KO). To inhibit senescence, wildtype (WT) and Sod1KO mice were given the senolytics, dasatinib, and quercetin (D + Q) at 6 months of age when the Sod1KO mice begin exhibiting signs of accelerated aging. Seven months of D + Q treatment reduced the expression of p16 in the livers of Sod1KO mice to WT levels and the expression of several senescence-associated secretory phenotype factors (IL-6, IL-1β, CXCL-1, and GDF-15). D + Q treatment also reduced markers of inflammation in livers of the Sod1KO mice, for example, cytokines, chemokines, macrophage levels, and Kupffer cell clusters. D + Q treatment had no effect on various markers of liver fibrosis in the Sod1KO mice but reduced the expression of genes involved in liver cancer and dramatically reduced the incidence of hepatocellular carcinoma. Surprisingly, D + Q also reduced markers of necroptosis (phosphorylated and oligomerized MLKL) in the Sod1KO mice to WT levels. We also found that inhibiting necroptosis in the Sod1KO mice with necrostatin-1s reduced the markers of cellular senescence (p16, p21, and p53). Our study suggests that an interaction occurs between cellular senescence and necroptosis in the liver of Sod1KO mice. We propose that these two cell fates interact through a positive feedback loop resulting in a cycle amplifying both cellular senescence and necroptosis leading to inflammaging and age-associated pathology in the Sod1KO mice.
本研究旨在探讨细胞衰老在铜锌超氧化物歧化酶(Sod1KO)缺失小鼠中引发炎症增加、慢性肝病和肝细胞癌中的作用。为了抑制衰老,野生型(WT)和 Sod1KO 小鼠在 6 个月大时开始出现加速衰老迹象时,给予衰老抑制剂达沙替尼和槲皮素(D+Q)。7 个月的 D+Q 治疗将 Sod1KO 小鼠肝脏中 p16 的表达降低至 WT 水平,并降低了几种衰老相关分泌表型因子(IL-6、IL-1β、CXCL-1 和 GDF-15)的表达。D+Q 治疗还降低了 Sod1KO 小鼠肝脏中炎症标志物的表达,例如细胞因子、趋化因子、巨噬细胞水平和枯否细胞簇。D+Q 治疗对 Sod1KO 小鼠的各种肝纤维化标志物没有影响,但降低了肝癌相关基因的表达,并显著降低了肝细胞癌的发生率。令人惊讶的是,D+Q 还将 Sod1KO 小鼠中坏死性凋亡(磷酸化和寡聚化 MLKL)的标志物降低至 WT 水平。我们还发现,用坏死性凋亡抑制剂 necrostatin-1s 抑制 Sod1KO 小鼠中的坏死性凋亡可降低细胞衰老标志物(p16、p21 和 p53)的表达。我们的研究表明,细胞衰老和坏死性凋亡在 Sod1KO 小鼠的肝脏中相互作用。我们提出,这两种细胞命运通过正反馈环相互作用,导致细胞衰老和坏死性凋亡循环放大,从而导致 Sod1KO 小鼠的炎症老化和与年龄相关的病理。
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