Activation of the Ig Iα1 promoter by the transcription factor Ets-1 triggers Ig Iα1-Cα1 germline transcription in epithelial cancer cells

Zhi Duan, Hui Zheng, San Xu, Yiqun Jiang, Haidan Liu, Ming Li, Duosha Hu, Wei Li, Ann M. Bode, Zigang Dong, Ya Cao

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Immunoglobulins (Igs) are known to be synthesized and secreted only by B lymphocytes. Class switch recombination (CSR) is a key event that enables B cells to express Igs, and one of the crucial steps for CSR initiation is the germline transcription of Ig genes. Surprisingly, recent studies have demonstrated that the Ig genes are also expressed in some epithelial cancer cells; however, the mechanisms underlying how cancer cells initiate CSR and express Igs are still unknown. In this study, we confirmed that the Ig Iα1 promoter in cancer cell lines was activated by the Ets-1 transcription factor, and the activity of the Ig Iα1 promoter and Ig Iα1-Cα1 germline transcription were attenuated after knockdown of Ets-1 by specific small interfering RNAs (siRNA). Furthermore, the expression of Ets-1 and Igα heavy chain in cancer cells was dose dependently upregulated by TGF-β1. These results indicate that activation of the Ig Iα1 promoter by the transcription factor Ets-1 is a critical pathway and provides a novel mechanism for Ig expression in non-B cell cancers.

Original languageEnglish (US)
Pages (from-to)197-205
Number of pages9
JournalCellular and Molecular Immunology
Volume11
Issue number2
DOIs
StatePublished - Mar 2014
Externally publishedYes

Keywords

  • Epithelial cancer cells
  • Ets-1
  • Ig Iα1 promoter

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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