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HIVEP1 aggravates NASH by reprogramming polyamine metabolism in TH17 cells.

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Researchers identified T helper 17 (TH17) cells as key drivers in nonalcoholic steatohepatitis (NASH) progression. Targeting HIVEP1 and ODC1 in TH17 cells may offer new therapeutic strategies for NASH.

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Area of Science:

  • Immunology
  • Hepatology
  • Molecular Biology

Background:

  • Nonalcoholic steatohepatitis (NASH) is an inflammatory liver disease that can lead to cirrhosis and liver cancer.
  • The specific immune cells and mechanisms driving the progression from nonalcoholic fatty liver disease (NAFLD) to NASH are not fully understood.

Purpose of the Study:

  • To investigate the role of immune cells in the transition from NAFLD to NASH.
  • To identify key molecular players and pathways involved in NASH pathogenesis.

Main Methods:

  • Single-cell assay for transposase accessible chromatin sequencing (scATAC-seq) to analyze immune cell populations in NASH livers.
  • Analysis of scATAC-seq and single-cell RNA sequencing (scRNA-seq) data to identify regulatory transcription factors.
  • Genetic knockout of key genes in mouse models and pharmacological inhibition of metabolic enzymes.

Main Results:

  • T helper 17 (TH17) cells were identified as the most abundant immune cell type in NASH livers.
  • Human immunodeficiency virus type I enhancer binding protein 1 (HIVEP1) was found to be a critical transcription factor regulating TH17 cell function.
  • Knockout of HIVEP1 impaired TH17 cell differentiation and alleviated NASH development in mice.
  • HIVEP1 regulates ornithine decarboxylase 1 (ODC1), a key enzyme in polyamine metabolism, influencing TH17 cell activity.
  • Inhibition of ODC1 reduced inflammation and prevented the NAFLD-to-NASH transition.

Conclusions:

  • TH17 cells play a crucial role in NASH development through HIVEP1-mediated regulation of polyamine metabolism.
  • HIVEP1 and ODC1 are identified as potential therapeutic targets for treating NASH.