期刊
CELLULAR & MOLECULAR IMMUNOLOGY
卷 11, 期 2, 页码 197-205出版社
CHIN SOCIETY IMMUNOLOGY
DOI: 10.1038/cmi.2013.52
关键词
epithelial cancer cells; Ets-1; Ig I alpha 1 promoter
类别
资金
- National High Technology Research and Development Program (863) of China [2006AA02A404]
- National Nature Science Foundation of China [30772465, 30973399]
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 I alpha 1 promoter in cancer cell lines was activated by the Ets-1 transcription factor, and the activity of the Ig I alpha 1 promoter and Ig I alpha 1-C alpha 1 germline transcription were attenuated after knockdown of Ets-1 by specific small interfering RNAs (siRNA). Furthermore, the expression of Ets-1 and Iga heavy chain in cancer cells was dose dependently upregulated by TGF-beta 1. These results indicate that activation of the Ig I alpha 1 promoter by the transcription factor Ets-1 is a critical pathway and provides a novel mechanism for Ig expression in non-B cell cancers.
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