Integrin β1 Establishes Liver Microstructure and Modulates Transforming Growth Factor β during Liver Development and Regeneration

Ryota Masuzaki, Kevin C. Ray, Joseph Roland, Roy Zent, Youngmin A. Lee, Seth J. Karp

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A unique and complex microstructure underlies the diverse functions of the liver. Breakdown of this organization, as occurs in fibrosis and cirrhosis, impairs liver function and leads to disease. The role of integrin β1 was examined both in establishing liver microstructure and recreating it after injury. Embryonic deletion of integrin β1 in the liver disrupts the normal development of hepatocyte polarity, specification of cell–cell junctions, and canalicular formation. This in turn leads to the expression of transforming growth factor β (TGF-β) and widespread fibrosis. Targeted deletion of integrin β1 in adult hepatocytes prevents recreation of normal hepatocyte architecture after liver injury, with resultant fibrosis. In vitro, integrin β1 is essential for canalicular formation and is needed to prevent stellate cell activation by modulating TGF-β. Taken together, these findings identify integrin β1 as a key determinant of liver architecture with a critical role as a regulator of TGF-β secretion. These results suggest that disrupting the hepatocyte–extracellular matrix interaction is sufficient to drive fibrosis.

Original languageEnglish
Pages (from-to)309-319
Number of pages11
JournalAmerican Journal of Pathology
Volume191
Issue number2
DOIs
StatePublished - Feb 2021
Externally publishedYes

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