Phospholipase C-epsilon augments epidermal growth factor-dependent cell growth by inhibiting epidermal growth factor receptor down-regulation
SCIE
SCOPUS
- Title
- Phospholipase C-epsilon augments epidermal growth factor-dependent cell growth by inhibiting epidermal growth factor receptor down-regulation
- Authors
- Yun, S; Hong, WP; Choi, JH; Yi, KS; Chae, SK; Ryu, SH; Suh, PG
- Date Issued
- 2008-01-04
- Publisher
- AMER SOC BIOCHEMISTRY MOLECULAR BIOLO
- Abstract
- The down-regulation of the epidermal growth factor (EGF) receptor is critical for the termination of EGF-dependent signaling, and the dysregulation of this process can lead to oncogenesis. In the present study, we suggest a novel mechanism for the regulation of EGF receptor down-regulation by phospholipase C-epsilon. The overexpression of PLC-epsilon led to an increase in receptor recycling and decreased the down-regulation of the EGF receptor in COS-7 cells. Adaptor protein complex 2 (AP2) was identified as a novel binding protein that associates with the PLC-epsilon RA2 domain independently of Ras. The interaction of PLC-epsilon with AP2 was responsible for the suppression of EGF receptor down-regulation, since a perturbation in this interaction abolished this effect. Enhanced EGF receptor stability by PLC-epsilon led to the potentiation of EGF-dependent growth in COS-7 cells. Finally, the knockdown of PLC-epsilon in mouse embryo fibroblast cells elicited a severe defect in EGF-dependent growth. Our results indicated that PLC-epsilon could promote EGF-dependent cell growth by suppressing receptor down-regulation.
- Keywords
- CLATHRIN; RAS; AP-2; TRAFFICKING; ENDOCYTOSIS; EXPRESSION; EFFECTOR; ADAPTERS; SUBUNIT; DOMAINS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23027
- DOI
- 10.1074/jbc.M704180200
- ISSN
- 0021-9258
- Article Type
- Article
- Citation
- JOURNAL OF BIOLOGICAL CHEMISTRY, vol. 283, no. 1, page. 341 - 349, 2008-01-04
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