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

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.

journal_name

Cell Mol Immunol

authors

Duan Z,Zheng H,Xu S,Jiang Y,Liu H,Li M,Hu D,Li W,Bode AM,Dong Z,Cao Y

doi

10.1038/cmi.2013.52

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

197-205

issue

2

eissn

1672-7681

issn

2042-0226

pii

cmi201352

journal_volume

11

pub_type

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