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NORE1A loss promotes MASLD/MASH

Howard Donninger1, Katherine Hobbing2, Gavin E Arteel3

  • 1Department of Medicine, University of Louisville, Louisville, KY, USA.

Transgenic Research
|September 9, 2024
PubMed

Insights

Loss of NORE1A, a tumor suppressor, promotes fatty liver disease (MASLD/MASH) by upregulating SREBP1. NORE1A deficiency may drive human MASLD, and NORE1A knockout mice offer a new disease model.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Oncology

Background:

  • NORE1A (RASSF5) functions as a tumor suppressor and is often downregulated in liver cancer.
  • It acts upstream in the HIPPO pathway, crucial for liver development and metabolism.
  • HIPPO pathway disruption is linked to the pathogenesis of metabolic-associated steatotic liver disease (MASLD) and metabolic-associated steatohepatitis (MASH).

Purpose of the Study:

  • To investigate the role of NORE1A in the development of liver disease, particularly MASLD/MASH.
  • To explore the potential of NORE1A knockout mice as a model for human MASLD/MASH.

Main Methods:

  • Phenotypic analysis of NORE1A knockout mice.
  • Assessment of NORE1A knockdown effects on sterol regulatory element-binding protein 1 (SREBP1) expression in liver cells.
  • Correlation analysis of NORE1A protein and TAZ expression in human MASLD samples.

Main Results:

  • NORE1A knockout mice did not develop liver tumors but showed a strong propensity for fatty liver, characteristic of MASLD/MASH.
  • NORE1A knockdown in liver cells led to increased SREBP1 expression, a key factor in MASLD development.
  • Human MASLD samples exhibited an inverse correlation between NORE1A protein and TAZ expression.

Conclusions:

  • Loss of NORE1A expression may contribute to the pathogenesis of MASLD/MASH in humans.
  • NORE1A knockout mice represent a potential new preclinical model for studying human MASLD/MASH.
  • Understanding NORE1A's role could reveal new therapeutic targets for fatty liver diseases.
Keywords:
MASHMASLDNORE1ARASSF5

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