4.8 Article

Pathogenesis of Nonalcoholic Steatohepatitis

Journal

GASTROENTEROLOGY
Volume 150, Issue 8, Pages 1769-1777

Publisher

W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1053/j.gastro.2016.02.066

Keywords

Nonalcoholic Fatty Liver Disease; Lipotoxicity; Wound-Healing Response; Misrepair

Funding

  1. National Institutes of Health [DK0077794, DK053792, R37 AA010154]
  2. Duke Endowment: The Florence McAlister Professorship
  3. Fundacao para a Ciencia e Tecnologia, FCT, Portugal

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Nonalcoholic steatohepatitis (NASH) is a necroinflammatory response that ensues when hepatocytes are injured by lipids (lipotoxicity). NASH is a potential outcome of nonalcoholic fatty liver (NAFL), a condition that occurs when lipids accumulate in hepatocytes. NASH may be reversible, but it can also result in cirrhosis and primary liver cancer. We are beginning to learn about the mechanisms of progression of NAFL and NASH. NAFL does not inevitably lead to NASH because NAFL is a heterogeneous condition. This heterogeneity exists because different types of lipids with different cytotoxic potential accumulate in the NAFL, and individuals with NAFL differ in their ability to defend against lipotoxicity. There are no tests that reliably predict which patients with NAFL will develop lipotoxicity. However, NASH encompasses the spectrum of wound-healing responses induced by lipotoxic hepatocytes. Differences in these wound-healing responses among individuals determine whether lipotoxic livers regenerate, leading to stabilization or resolution of NASH, or develop progressive scarring, cirrhosis, and possibly liver cancer. We review concepts that are central to the pathogenesis of NASH.

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