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ORIGINAL RESEARCH article

Front. Physiol.
Sec. Lipid and Fatty Acid Research
Volume 15 - 2024 | doi: 10.3389/fphys.2024.1497297
This article is part of the Research Topic The Evolving Landscape of Lipid Mediators: Insights into Physiology and Cell Signaling View all articles

The CYP4/20-HETE/GPR75 axis in the progression of metabolic-associated steatosis liver disease (MASLD) to chronic liver disease

Provisionally accepted
James Hardwick James Hardwick 1*Byoung-Joon Song2 Joon Song Byoung-Joon Song2 Joon Song 2YOONKWANG LEE YOONKWANG LEE 1Paul Rote Paul Rote 1Charles Leahy Charles Leahy 1Alexandra Wolf Alexandra Wolf 3Danielle Diegisser Danielle Diegisser 3Victor Garcia Victor Garcia 3
  • 1 Northeast Ohio Medical University, Rootstown Township, United States
  • 2 National Institute on Alcohol Abuse and Alcoholism (NIH), Bethesda, Maryland, United States
  • 3 New York Medical College, Valhalla, New York, United States

The final, formatted version of the article will be published soon.

    : Metabolic-dysfunction-associated steatosis liver disease (MASLD) is a progressive liver disease from simple steatosis, steatohepatitis, fibrosis, cirrhosis, and hepatocellular carcinoma. Chronic liver diseases (CLDs) can lead to portal hypertension, which is a major cause of complications of cirrhosis. CLDs cause structural alterations across the liver through increased contents of extracellular matrix (ECM), driving dysfunction of liver sinusoidal endothelial cells (LSECs) alongside hepatic stellate cells (HSCs) and activated resident or infiltrating immune cells. Bioactive arachidonic metabolites have diverse roles in the progression of MASLD. Both secreted levels of 20-hydroxyeicosatetraenoic acid (20-HETE) and epoxyeicosatrienoic acid (EET) are elevated in patients with liver cirrhosis. To address the role of the CYP4/20-HETE/GPR75 axis, we measured the amount and the synthesis of 20-HETE in patients with CLD, specifically during the progression of MASLD. We observed an increase in 20-HETE levels and synthesis during the progression of MASLD. Increased synthesis of 20-HETE correlated with the expression of CYP4A11 genes but not CYP4F2. These results were confirmed by increased P4504A11 protein levels and decreased P4504F2 protein levels during the development and progression of MASLD. The gene expression and protein levels of GPR75, the major receptor for 20-HETE, increased in the progression of MASLD. Interestingly, the CYP4A11 and GPR75 mRNA levels increased in steatohepatitis but dramatically dropped in cirrhosis and then increased in patients with HCC. Also, protein levels of P4504A11 and GPR75 mirrored their mRNA levels. The abrupt reduction in CYP4A11 and GPR75 in patients with cirrhosis may be due to increased 20-HETE, serving as a feedback mechanism via GPR75, leading to reduced CYP4A11 and GPR75 gene expression. These results indicate that the CYP4A11 and subsequent GPR75 genes are coordinately regulated in the progression of MASLD and may have multiple roles, including 20-HETE activation of peroxisome proliferator-activated receptor α (PPARα) in steatosis and GPR75 in CLD through either increased cell proliferation or vasoconstriction in portal hypertension in cirrhosis.

    Keywords: investigation, resources, Writing -review & editing. Byoung-Joon Song2 Joon Song: Funding acquisition, methodology, project administration, Validation, Writing -original draft, Writing -review & editing. Charles Leahy: Conceptualization

    Received: 16 Sep 2024; Accepted: 24 Dec 2024.

    Copyright: © 2024 Hardwick, Song, LEE, Rote, Leahy, Wolf, Diegisser and Garcia. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: James Hardwick, Northeast Ohio Medical University, Rootstown Township, United States

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