Semin Liver Dis 2021; 41(01): 042-049
DOI: 10.1055/s-0040-1719175
Review Article

Differential Roles for Diploid and Polyploid Hepatocytes in Acute and Chronic Liver Injury

Patrick D. Wilkinson
1   Division of Genetics, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
,
Andrew W. Duncan
2   Department of Pathology, McGowan Institute for Regenerative Medicine, Pittsburgh Liver Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania
› Author Affiliations

Funding This work was supported by grants to A.W.D. from the NIH (R01 DK103645) and the Commonwealth of Pennsylvania.
Preview

Abstract

Hepatocytes are the primary functional cells of the liver that perform essential roles in homeostasis, regeneration, and injury. Most mammalian somatic cells are diploid and contain pairs of each chromosome, but there are also polyploid cells containing additional sets of chromosomes. Hepatocytes are among the best described polyploid cells, with polyploids comprising more than 25 and 90% of the hepatocyte population in humans and mice, respectively. Cellular and molecular mechanisms that regulate hepatic polyploidy have been uncovered, and in recent years, diploid and polyploid hepatocytes have been shown to perform specialized functions. Diploid hepatocytes accelerate liver regeneration induced by resection and may accelerate compensatory regeneration after acute injury. Polyploid hepatocytes protect the liver from tumor initiation in hepatocellular carcinoma and promote adaptation to tyrosinemia-induced chronic injury. This review describes how ploidy variations influence cellular activity and presents a model for context-specific functions for diploid and polyploid hepatocytes.



Publication History

Article published online:
14 December 2020

© 2020. Thieme. All rights reserved.

Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA