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Achaete scute-like 2 suppresses CDX2 expression and inhibits intestinal neoplastic epithelial cell differentiation

Yangyang Shang1, Qiong Pan1, Lei Chen1

  • 1Department of Gastroenterology, Southwest Hospital, Third Military Medical University, Chongqing, P. R. China.

Oncotarget
|August 27, 2015
PubMed

Insights

Achaete scute-like 2 (Ascl2) represses colorectal cancer (CRC) cell differentiation by inhibiting caudal type homeobox 2 (CDX2) expression. Targeting the Ascl2/CDX2 pathway may offer new CRC therapies.

Area of Science:

  • Molecular biology
  • Cancer research
  • Cell differentiation

Background:

  • The role of Achaete scute-like 2 (Ascl2) in colorectal cancer (CRC) cell differentiation remains unclear.
  • Ascl2 expression varies across different CRC cell lines, suggesting a potential role in cancer progression.

Purpose of the Study:

  • To investigate the function of Ascl2 in CRC cell differentiation.
  • To elucidate the regulatory relationship between Ascl2 and caudal type homeobox 2 (CDX2).

Main Methods:

  • Utilized Ascl2 knockdown and over-expression in CRC cell lines (LS174T, HT-29, Lovo, SW480).
  • Performed luciferase assays and chromatin immunoprecipitation (ChIP) to assess transcriptional regulation.
  • Analyzed MUC2, TFF3, and CDX2 expression at mRNA and protein levels.
  • Correlated Ascl2, CDX2, and MUC2 levels in CRC patient samples.

Main Results:

  • Ascl2 knockdown promoted CRC cell differentiation into goblet cells, indicated by increased MUC2, TFF3, and CDX2.
  • Ascl2 directly binds to the CDX2 promoter, transcriptionally activating its expression.
  • Ascl2 over-expression inhibited goblet cell differentiation markers (CDX2, MUC2).
  • Inverse correlations observed between Ascl2 and CDX2/MUC2 in CRC tissues.

Conclusions:

  • Ascl2 acts as a repressor of CDX2 expression in CRC.
  • Ascl2 plays a significant role in regulating CRC cell differentiation.
  • The Ascl2/CDX2 axis represents a potential therapeutic target for colorectal cancer treatment.
Keywords:
Achaete scute-like 2CDX2colorectal carcinomadifferentiationtranscriptional regulation

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