CDX2 regulates interleukin-33 gene expression in intestinal epithelial cells (LS174T)

Area of Science:

• Molecular Biology
• Genetics
• Immunology

Background:

• Interleukin-33 (IL-33) dysregulation is linked to autoimmune and inflammatory diseases.
• The transcriptional regulation of the IL33 gene remains largely unexamined.
• CDX2 is a key intestinal transcription factor regulating gene networks in the gut.

Purpose of the Study:

• To investigate the role of the intestinal transcription factor CDX2 in regulating IL33 gene expression.
• To determine if CDX2 influences IL33 mRNA levels in colonic epithelial cells.

Main Methods:

• Analysis of IL33 mRNA expression in primary human colonic epithelial cells and cell lines.
• Genomic analyses including ChIP-seq and RNA-seq in LS174T cells.
• Promoter analysis, Western blotting, and qRT-PCR to assess CDX2-dependent IL33 regulation.

Main Results:

• High IL33 mRNA expression was observed in primary colonic epithelial cells and LS174T cells.
• Genomic data revealed CDX2-dependent intronic enhancer activity within the IL33 gene.
• IL33 expression was confirmed to be upregulated in a CDX2 concentration-dependent manner.

Conclusions:

• CDX2 directly regulates IL33 gene expression.
• This finding provides the first evidence of CDX2 controlling IL33 transcription.
• Understanding this regulatory mechanism may offer insights into IL-33-associated inflammatory diseases.