Myc stimulates B lymphocyte differentiation and amplifies calcium signaling.
Myc stimulates B lymphocyte differentiation and amplifies calcium signaling.
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MYC刺激B淋巴细胞分化并放大钙信号传导。
DOI:
10.1083/jcb.200704173
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发表时间:
2007-11-19
期刊:
影响因子:
--
通讯作者:
Iritani BM
中科院分区:
文献类型:
--
作者:
Habib T;Park H;Tsang M;de Alborán IM;Nicks A;Wilson L;Knoepfler PS;Andrews S;Rawlings DJ;Eisenman RN;Iritani BM
Deregulated expression of the Myc family of transcription factors (c-, N-, and L-myc) contributes to the development of many cancers by a mechanism believed to involve the stimulation of cell proliferation and inhibition of differentiation. However, using B cell–specific c-/N-myc double-knockout mice and Eμ-myc transgenic mice bred onto genetic backgrounds (recombinase-activating gene 2−/− and Btk−/− Tec−/−) whereby B cell development is arrested, we show that Myc is necessary to stimulate both proliferation and differentiation in primary B cells. Moreover, Myc expression results in sustained increases in intracellular Ca2+ ([Ca2+]i), which is required for Myc to stimulate B cell proliferation and differentiation. The increase in [Ca2+]i correlates with constitutive nuclear factor of activated T cells (NFAT) nuclear translocation, reduced Ca2+ efflux, and decreased expression of the plasma membrane Ca2+–adenosine triphosphatase (PMCA) efflux pump. Our findings demonstrate a revised model whereby Myc promotes both proliferation and differentiation, in part by a remarkable mechanism whereby Myc amplifies Ca2+ signals, thereby enabling the concurrent expression of Myc- and Ca2+-regulated target genes.
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