GIPC2 interacts with Fzd7 to promote prostate cancer metastasis by activating WNT signaling.

GIPC2 interacts with Fzd7 to promote prostate cancer metastasis by activating WNT signaling.
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GIPC2与Fzd7相互作用通过激活WNT信号促进前列腺癌转移

DOI:
10.1038/s41388-022-02255-4
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发表时间:
2022-04
期刊:
影响因子:
8
通讯作者:
Liu J
Liu J
中科院分区:
医学1区
文献类型:
--
作者:
Wang L;Wang J;Yin X;Guan X;Li Y;Xin C;Liu J

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前列腺癌(PCa)具有严重的死亡率和致残率,并伴有晚期转移。WNT信号通路是治疗转移性前列腺癌的一个有前景的靶点。GIPC2是一个GIPC1类似基因,参与了与肿瘤进展相关的WNT信号通路,但其在PCa转移中的作用尚不清楚。在此,我们证明了GIPC2在PCa组织中的高表达与远处转移和预后不良显著相关。功能研究表明,CpG岛去甲基化导致的GIPC2高表达促进了PCa细胞转移能力的增强。相反,在体外和体内,沉默GIPC2的表达显著抑制了PCa的转移。此外,GIPC2通过其PDZ结构域直接与WNT共受体FZD7结合,从而激活WNT-β-catenin级联反应,从而刺激PCa转移。有趣的是,GIPC2蛋白也被鉴定为外切体的一种成分,它强烈地刺激了PCA的黏附、侵袭和迁移。GIPC2在肿瘤来源的外体中的存在以及对肿瘤细胞行为的影响表明GIPC2是一个新的与前列腺癌转移有关的表观遗传癌基因。我们的发现证实GIPC2是一个与WNT信号相关的新的外体分子,并可能成为转移性前列腺癌的潜在治疗靶点和生物标志物。
Prostate cancer (PCa) causes significant mortality and morbidity, with advanced metastasis. WNT signaling is a promising therapeutic target for metastatic PCa. GIPC2 is a GIPC1 paralog involved in WNT signaling pathways associated with tumor progression, but its role in PCa metastasis remains unclear. Herein, we demonstrated that high GIPC2 expression in PCa tissues was significantly associated with distant metastasis and poor prognosis. Functional studies demonstrated that high GIPC2 expression due to CpG-island demethylation promoted increased metastatic capabilities of PCa cells. Conversely, silencing GIPC2 expression significantly inhibited PCa metastasis in vitro and in vivo. Furthermore, GIPC2 directly bound the WNT co-receptor Fzd7 through its PDZ domain, which enabled activation of WNT-β-catenin cascades, thereby stimulating PCa metastasis. Interestingly, GIPC2 protein was also identified as a component of exosomes and that it robustly stimulated PCa adhesion, invasion, and migration. The presence of GIPC2 in tumor-derived exosomes and ability to impact the behavior of tumor cells suggest that GIPC2 is a novel epigenetic oncogene involved in PCa metastasis. Our findings identified GIPC2 as a novel exosomal molecule associated with WNT signaling and may represent a potential therapeutic target and biomarker for metastatic PCa.
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