Regulation of c-MYC transcriptional activity by transforming growth factor-beta 1-stimulated clone 22.

Regulation of c-MYC transcriptional activity by transforming growth factor-beta 1-stimulated clone 22.
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DOI:
10.1111/cas.13466
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发表时间:
2018-03
期刊:
影响因子:
5.7
通讯作者:
Kato M
Kato M
中科院分区:
医学2区
文献类型:
--
作者:
Zheng L;Suzuki H;Nakajo Y;Nakano A;Kato M

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c-MYC通过抑制细胞周期蛋白依赖性激酶(CDK)抑制剂(包括P15(CDKN 2B)和P21(CDKN 1A))刺激细胞增殖。它还激活E-box介导的各种靶基因的转录,包括参与细胞永生和肿瘤发生的端粒酶逆转录酶(TERT)。转化生长因子-β 1(TGF-β1)刺激的克隆22(TSC-22/TSC 22 D1)编码一种高度保守的亮氨酸拉链蛋白,该蛋白可由各种刺激(包括TGF-β)诱导。TSC-22抑制哺乳动物细胞和非洲爪蟾胚胎中的细胞生长。然而,TSC-22抑制生长的潜在机制仍不清楚。在这里,我们发现TSC-22与c-MYC物理相互作用,抑制c-MYC在P15(CDKN 2B)和P21(CDKN 1A)启动子上的募集,有效抑制c-MYC介导的P15(CDKN 2B)和P21(CDKN 1A)启动子活性的抑制。相比之下,TSC-22增强c-MYC介导的TERT启动子活化。此外,TSC-22在胚胎干细胞中的表达抑制细胞生长,而不影响其多能性相关基因的表达。这些结果表明,TSC-22差异调节c-MYC-介导的转录活性,以调节细胞增殖。
c‐MYC stimulates cell proliferation through the suppression of cyclin‐dependent kinase (CDK) inhibitors including P15 (CDKN2B) and P21 (CDKN1A). It also activates E‐box‐mediated transcription of various target genes including telomerase reverse transcriptase (TERT) that is involved in cellular immortality and tumorigenesis. Transforming growth factor‐beta 1 (TGF‐β1)‐stimulated clone 22 (TSC‐22/TSC22D1) encodes a highly conserved leucine zipper protein that is induced by various stimuli, including TGF‐β. TSC‐22 inhibits cell growth in mammalian cells and in Xenopus embryos. However, underlying mechanisms of growth inhibition by TSC‐22 remain unclear. Here, we show that TSC‐22 physically interacts with c‐MYC to inhibit the recruitment of c‐MYC on the P15 (CDKN2B) and P21 (CDKN1A) promoters, effectively inhibiting c‐MYC‐mediated suppression of P15 (CDKN2B) and also P21 (CDKN1A) promoter activities. In contrast, TSC‐22 enhances c‐MYC‐mediated activation of the TERT promoter. Additionally, the expression of TSC‐22 in embryonic stem cells inhibits cell growth without affecting its pluripotency‐related gene expression. These results indicate that TSC‐22 differentially regulates c‐MYC‐mediated transcriptional activity to regulate cell proliferation.
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发表时间: 2004-10-01
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