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 Immunoljournal_title
Cellular & molecular immunologyauthors
Duan Z,Zheng H,Xu S,Jiang Y,Liu H,Li M,Hu D,Li W,Bode AM,Dong Z,Cao Ydoi
10.1038/cmi.2013.52subject
Has Abstractpub_date
2014-03-01 00:00:00pages
197-205issue
2eissn
1672-7681issn
2042-0226pii
cmi201352journal_volume
11pub_type
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