通过不同的受体相互作用模式,Cbl和Cbl-b独立调节EGFR
Itziar Pinilla-Macua1, Alexander Sorkin1
1Department of Cell Biology, University of Pittsburgh, School of Medicine, Pittsburgh, PA, 15261.
Molecular biology of the cell
|October 30, 2023
概括
Cbl和Cbl-b E3酶控制了EGF受体 (EGFR) 的无化和降解. 这项研究表明,它们通过不同的EGFR结合机制独立运作,影响细胞迁移.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- Cbl 和 Cbl-b 是同类的 E3 泛基因酶,参与EGF受体 (EGFR) 泛基因化,内细胞化和降解.
- 它们被认为通过与EGFR的化Y1045 (pY1045) 结合或间接通过Grb2适配器冗余地发挥作用.
研究的目的:
- 研究Cbl和Cbl-b在EGFR调控中的不同作用和机制.
- 为了确定E3酶活性是否对Cbl和Cbl-b介导的EGFR泛化和内细胞化至关重要.
主要方法:
- 在人类口腔状细胞癌 (HSC3) 和OSC-19细胞系中,野生型和E3-dead Cbl/Cbl-b突变的诱导表达.
- 对EGFR无化,内细胞化和降解的分析.
- 评估MAPK/ERK1/2活动和EGF引导的细胞迁移.
主要成果:
- E3死亡的Cbl和Cbl-b突变保留了EGFR结合,但没有显著影响EGFR无化或内细胞化.
- Cbl-b通过pY1045优先结合EGFR,而Cbl使用了Grb2适配器.
- 过度表达E3死亡的Cbl-b损害了EGF诱导的EGFR降解和HSC3细胞迁移,对OSC-19细胞迁移的影响因内源Cbl-b水平而异.
结论:
- Cbl和Cbl-b独立运作,具有不同的EGFR结合机制来调节EGFR无处不在,贩运和信号.
- 它们在EGFR介导的细胞迁移中的作用是特定于细胞类型的,并取决于内源性表达水平.
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