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Updated: Jun 17, 2025

Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Yeast As a Chassis for Developing Functional Assays to Study Human P53

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MDM2 Is Essential to Maintain the Homeostasis of Epithelial Cells by Targeting p53

Su Wang1, Shufen Zhong2, Ying Huang2

  • 1Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.

Journal of Innate Immunity
|August 12, 2024
PubMed
Abstract

Insights

MDM2 regulates lung epithelial cell homeostasis by targeting p53. Loss of MDM2 in lung cells exacerbates allergic asthma by increasing inflammation and cell apoptosis.

Area of Science:

  • Immunology
  • Molecular Biology
  • Pulmonology

Background:

  • MDM2 is a key negative regulator of p53.
  • MDM2 influences lung injury and fibrosis via p53-dependent and independent pathways.
  • The role of MDM2 in asthma pathogenesis remains unclear.

Purpose of the Study:

  • To investigate the function of MDM2 in lung epithelial cells during type 2 lung inflammation.
  • To elucidate the mechanism of MDM2's influence on asthma.

Main Methods:

  • Utilized type II alveolar epithelial cell-specific heterozygous knockout of Mdm2 mice.
  • Established a papain-induced asthma model.
  • Analyzed inflammation through immunohistochemistry and flow cytometry.

Main Results:

  • Mdm2 gene knockdown in type 2 alveolar epithelial cells led to increased susceptibility to papain-induced pulmonary inflammation.
  • Observed elevated ILC2 numbers, IL-5 and IL-13 cytokine levels, and lung pathology in Mdm2-deficient mice.
  • Decreased Mdm2 expression resulted in p53 overactivation, apoptosis, and increased expression of inflammation-related genes (IL-25, HMGB1, TNF-α), amplifying ILC2 response.

Conclusions:

  • MDM2 is crucial for maintaining lung epithelial cell homeostasis by regulating p53.
  • MDM2 controls lung epithelial cell function in the context of type 2 lung inflammation.
Keywords:
Alveolar type 2 cellsApoptosisMDM2Type 2 lung inflammationp53

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