CRL2KLHDC3和CRL1Fbxw7合作调解c-Myc降解的过程
Saori Motomura1, Kanae Yumimoto2, Takeshi Tomonaga3
1Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, 812-8582, Japan.
Oncogene
|May 2, 2024
概括
一种新型的E3泛基因酶,CRL2KLHDC3,与CRL1Fbxw7合作,降解原蛋白蛋白c-Myc. 这一途径对于低糖原合成酶激酶3 (GSK3) 活性的癌细胞中瘤抑制至关重要.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- c-Myc 是一个对细胞过程至关重要的原蛋白;其异常表达驱动瘤发生.
- c-Myc 蛋白质的稳定性主要由 CRL1 Fbxw7 泛素结合酶调节,这取决于 GSK3 酸化.
- 一些癌细胞表现出抗GSK3抑制剂的c-Myc降解,这意味着有替代的调节性E3链酶.
研究的目的:
- 为了识别参与c-Myc降解的新型E3泛素酶.
- 研究CRL2KLHDC3在c-Myc稳定性和癌症进展中的作用.
- 探索KLHDC3,SHISA2和胰腺癌患者预后之间的关系.
主要方法:
- 质谱测量以识别针对c-Myc.c的E3链酶.
- 基因枯竭研究 (Fbxw7和KLHDC3) 来评估c-Myc稳定性.
- 在免疫缺陷小鼠中的异种移植瘤形成,以评估瘤生长.
- 在来自患者的癌细胞和组织中分析SHISA2和KLHDC3的表达.
主要成果:
- 质谱学确定了CRL2KLHDC3作为c-Myc降解的E3联酶.
- 结合Fbxw7和KLHDC3的消耗显著稳定了GSK3抑制剂不敏感的癌细胞中的c-Myc.
- 来自缺少Fbxw7和KLHDC3的细胞的瘤大于仅缺少Fbxw7.7的瘤.
- 在这些患者中,GSK3i不敏感的胰腺癌细胞显示较低的SHISA2水平; KLHDC3 mRNA与预后相关.
结论:
- CRL2KLHDC3与CRL1Fbxw7合作,在低GSK3活性的癌细胞的一个子集中降解c-Myc.
- 这种合作性降解途径在特定癌症中代表了潜在的治疗标.
- KLHDC3表达是胰腺癌患者低SHISA2.2的预后标志物.
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