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:
The Journal of cell biology
影响因子:
--
通讯作者:
Iritani BM
Iritani BM
中科院分区:
其他
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

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Myc家族转录因子(c-、N-和L-myc)的失调表达通过被认为涉及刺激细胞增殖和抑制分化的机制促成许多癌症的发展。然而,使用B细胞特异性c-/N-myc双敲除小鼠和Eμ-myc转基因小鼠繁殖到遗传背景(重组酶激活基因2−/−和Btk−/− Tec−/−),从而阻止B细胞的发育,我们表明Myc是刺激原代B细胞增殖和分化所必需的。此外,Myc表达导致胞内Ca 2+([Ca 2 +]i)的持续增加,这是Myc刺激B细胞增殖和分化所需的。[Ca 2 +]i的增加与活化T细胞的组成性核因子(NFAT)核转位、Ca 2+外排减少和质膜Ca 2 +-腺苷三磷酸酶(PMCA)外排泵表达减少相关。我们的研究结果证明了一个修订的模型,其中Myc促进增殖和分化,部分是通过一个显着的机制,其中Myc放大Ca 2+信号,从而使Myc和Ca 2+调节的靶基因的同时表达。
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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