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m6A mRNA Methylation Regulates Epithelial Innate Antimicrobial Defense Against Cryptosporidial Infection

Zijie Xia1, Jihao Xu1, Eugene Lu2

  • 1Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States.

Frontiers in Immunology
|July 23, 2021
PubMed

Insights

N6-methyladenosine (m6A) mRNA modification in intestinal epithelial cells changes during Cryptosporidium parvum infection. This m6A alteration impacts immune gene expression and epithelial defense mechanisms.

Area of Science:

  • Immunology
  • Epigenetics
  • Microbiology

Background:

  • Intestinal epithelial cells are crucial for innate defense against microbial infections.
  • The role of N6-methyladenosine (m6A) mRNA modification in intestinal immunity is increasingly recognized.
  • Mechanisms of intestinal epithelial defense against Cryptosporidium parvum infection require further elucidation.

Purpose of the Study:

  • To investigate alterations in the m6A mRNA methylome of intestinal epithelial cells upon Cryptosporidium parvum infection.
  • To understand the functional consequences of m6A modification changes on host defense mechanisms.
  • To explore the involvement of NF-κB signaling in the m6A-mediated response to infection.

Main Methods:

  • Analysis of m6A mRNA methylome topology in intestinal epithelial cells after C. parvum infection.
  • Assessment of gene expression changes, including alpha-ketoglutarate-dependent dioxygenase alkB homolog 5 and fat mass and obesity-associated protein.
  • Evaluation of immune-related gene expression (e.g., immunity-related GTPase family M member 2, interferon gamma induced GTPase) and NF-κB signaling pathway activation.

Main Results:

  • Significant alterations in the m6A mRNA methylome topology were observed in intestinal epithelial cells post-infection.
  • Downregulation of alkB homolog 5 and fat mass and obesity-associated protein, alongside NF-κB signaling activation, was associated with altered m6A methylation.
  • Decreased m6A mRNA methylation correlated with increased expression of immune-related genes, enhancing epithelial defense.

Conclusions:

  • Intestinal epithelial cells exhibit dynamic changes in their m6A mRNA methylome in response to C. parvum infection.
  • m6A modification plays a regulatory role in intestinal epithelial innate defense by modulating immune-related gene expression via NF-κB signaling.
  • These findings highlight m6A methylation as a key factor in fine-tuning antimicrobial defense in the gut epithelium.
Keywords:
ALKBH5CryptosporidiumIgtpIrgm2RNA stabilitydefenseintestinal epitheliumm6A

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