SIRT1 Mediates the Antagonism of Wnt/β-Catenin Pathway by Vitamin D in Colon Carcinoma Cells.

IF 8.2 2区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY International Journal of Biological Sciences Pub Date : 2024-10-07 eCollection Date: 2024-01-01 DOI:10.7150/ijbs.95875
José Manuel García-Martínez, Ana Chocarro-Calvo, Javier Martínez-Useros, Nerea Regueira-Acebedo, María Jesús Fernández-Aceñero, Alberto Muñoz, María Jesús Larriba, Custodia García-Jiménez
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Abstract

Cancer initiation and progression result from genetic and epigenetic alterations caused by interactions between environmental and endogenous factors leading to aberrant cell signalling. Colorectal cancers (CRC) are linked to abnormal activation of the Wnt/β-catenin pathway, whose key feature is the nuclear accumulation of acetylated β-catenin in colon epithelial cells. Nuclear β-catenin acts as a transcriptional co-activator, targeting genes involved in cell proliferation and invasion. 1α,25-Dihydroxyvitamin D3 (1,25(OH)2D3 or calcitriol), the active form of vitamin D, antagonizes Wnt/β-catenin over-activation by engaging its high affinity receptor, VDR. Here we unveil that 1,25(OH)2D3-bound VDR activates Silent Information Regulator of Transcription, sirtuin 1 (SIRT1), leading to β-catenin deacetylation and nuclear exclusion, downregulation of its pro-tumourigenic target genes and inhibition of human colon carcinoma cell proliferation. Notably, orthogonal SIRT1 activation mimics nuclear exclusion of β-catenin while SIRT1 inhibition blocks the effects of 1,25(OH)2D3. Thus, SIRT1 emerges as a crucial mediator in the protective action of vitamin D against CRC. The mutual negative feedback loop unveiled here between Wnt and SIRT1 represents an important surrogate target in CRC. Since nuclear localisation of β-catenin is a critical driver of CRC that requires its acetylation, we provide a mechanistic foundation for the epidemiological evidence linking vitamin D deficiency and increased CRC risk and mortality.

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维生素 D 在结肠癌细胞中调解 SIRT1 对 Wnt/β-Catenin 通路的拮抗作用
癌症的发生和发展源于环境因素和内源性因素相互作用引起的遗传和表观遗传学改变,从而导致细胞信号异常。结肠直肠癌(CRC)与 Wnt/β-catenin 通路的异常激活有关,其主要特征是乙酰化的 β-catenin 在结肠上皮细胞核内聚集。核β-catenin作为一种转录共激活因子,靶向参与细胞增殖和侵袭的基因。1α,25-二羟维生素 D3(1,25(OH)2D3 或钙三醇)是维生素 D 的活性形式,它通过与高亲和力受体 VDR 结合来拮抗 Wnt/β-catenin 的过度激活。在这里,我们揭示了与 1,25(OH)2D3 结合的 VDR 可激活沉默信息转录调节因子 sirtuin 1(SIRT1),从而导致 β-catenin 去乙酰化和核排斥,下调其促肿瘤靶基因,抑制人类结肠癌细胞增殖。值得注意的是,正交 SIRT1 激活可模拟 β-catenin 的核排斥,而抑制 SIRT1 则可阻断 1,25(OH)2D3 的作用。因此,SIRT1 成为维生素 D 对 CRC 起保护作用的关键介质。本文揭示的 Wnt 与 SIRT1 之间的相互负反馈回路代表了 CRC 的一个重要替代靶点。由于β-catenin的核定位是CRC的一个关键驱动因素,需要其乙酰化,因此我们为维生素D缺乏与CRC风险和死亡率增加之间的流行病学证据提供了一个机理基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Biological Sciences
International Journal of Biological Sciences 生物-生化与分子生物学
CiteScore
16.90
自引率
1.10%
发文量
413
审稿时长
1 months
期刊介绍: The International Journal of Biological Sciences is a peer-reviewed, open-access scientific journal published by Ivyspring International Publisher. It dedicates itself to publishing original articles, reviews, and short research communications across all domains of biological sciences.
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