SQSTM1/p62 and Hepatic Mallory-Denk Body Formation in Alcohol-Associated Liver Disease
Hui Qian, Wen‐Xing Ding
Abstract
Sequestosome 1 (SQSTM1/p62; hereafter p62) is an autophagy receptor protein for selective autophagy primarily due to its direct interaction with the microtubule light chain 3 protein that specifically localizes on autophagosome membranes. As a result, impaired autophagy leads to the accumulation of p62. p62 is also a common component of many human liver disease–related cellular inclusion bodies, such as Mallory-Denk bodies, intracytoplasmic hyaline bodies, α1-antitrypsin aggregates, as well as p62 bodies and condensates. p62 also acts as an intracellular signaling hub, and it involves multiple signaling pathways, including nuclear factor erythroid 2–related factor 2, NF-κB, and the mechanistic target of rapamycin, which are critical for oxidative stress, inflammation, cell survival, metabolism, and liver tumorigenesis. This review discusses the recent insights of p62 in protein quality control, including the role of p62 in the formation and degradation of p62 stress granules and protein aggregates as well as regulation of multiple signaling pathways in the pathogenesis of alcohol-associated liver disease. Sequestosome 1 (SQSTM1/p62; hereafter p62) is an autophagy receptor protein for selective autophagy primarily due to its direct interaction with the microtubule light chain 3 protein that specifically localizes on autophagosome membranes. As a result, impaired autophagy leads to the accumulation of p62. p62 is also a common component of many human liver disease–related cellular inclusion bodies, such as Mallory-Denk bodies, intracytoplasmic hyaline bodies, α1-antitrypsin aggregates, as well as p62 bodies and condensates. p62 also acts as an intracellular signaling hub, and it involves multiple signaling pathways, including nuclear factor erythroid 2–related factor 2, NF-κB, and the mechanistic target of rapamycin, which are critical for oxidative stress, inflammation, cell survival, metabolism, and liver tumorigenesis. This review discusses the recent insights of p62 in protein quality control, including the role of p62 in the formation and degradation of p62 stress granules and protein aggregates as well as regulation of multiple signaling pathways in the pathogenesis of alcohol-associated liver disease. 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K. the bodies and intracellular hyaline bodies in and A J Scholar Both and in in which in approximately to of are in approximately of the H. A. T. G. L. K. the bodies and intracellular hyaline bodies in and A J J.M. carcinoma with intracytoplasmic a report of Hepatol. S. Y. T. A. Y. Y. in associated with viral hepatitis alcoholic liver J Scholar In with the of is A. J. J. K. A. P. F. R. J. with intracellular hyaline bodies a 37: Scholar are also by autophagy, and an increase in protein aggregates is as a of impaired K. P. to and Res. 2007; S. T. T. J. S. of p62 inclusion formation in 2007; Scholar and also and studies are to and to the liver injury and in and the few the of a number of the such as and a of and current on cellular and of cellular Scholar can in during stress as a to the on cell health by stress, and of is in many R. and of stress B. P. granules and 20: Scholar which are of and F. in 2014; Scholar can and a and can the as well as with