Detailed Information

Cited 19 time in webofscience Cited 21 time in scopus
Metadata Downloads

Inhibition of ezrin causes PKC alpha-mediated internalization of erbb2/HER2 tyrosine kinase in breast cancer cells

Authors
Jeong, JaekwangChoi, JungminKim, WonnamDann, PamelaTakyar, FarzinGefter, Julia V.Friedman, Peter A.Wysolmerski, John J.
Issue Date
18-Jan-2019
Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Keywords
ezrin; scaffold protein; breast cancer; heat shock protein 90 (Hsp90); PDZ domain; protein kinase C (PKC); ErbB2/HER2; NHERF1; PMCA2
Citation
JOURNAL OF BIOLOGICAL CHEMISTRY, v.294, no.3, pp 887 - 901
Pages
15
Indexed
SCI
SCIE
SCOPUS
Journal Title
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume
294
Number
3
Start Page
887
End Page
901
URI
https://scholarworks.korea.ac.kr/kumedicine/handle/2020.sw.kumedicine/2478
DOI
10.1074/jbc.RA118.004143
ISSN
0021-9258
1083-351X
Abstract
Unlike other ErbB family members, HER2 levels are maintained on the cell surface when the receptor is activated, allowing prolonged signaling and contributing to its transforming ability. Interactions between HER2, HSP90, PMCA2, and NHERF1 within specialized plasma membrane domains contribute to the membrane retention of HER2. We hypothesized that the scaffolding protein ezrin, which has been shown to interact with NHERF1, might also help stabilize the HER2-PMCA2-NHERF1 complex at the plasma membrane. Therefore, we examined ezrin expression and its relationship with HER2, NHERF1, and PMCA2 levels in murine and human breast cancers. We also used genetic knockdown and/or pharmacologic inhibition of ezrin, HSP90, NHERF1, PMCA2, and HER2 to examine the functional relationships between these factors and membrane retention of HER2. We found ezrin to be expressed at low levels at the apical surface of normal mammary epithelial cells, but its expression is up-regulated and correlates with HER2 expression in hyperplasia and tumors in murine mammary tumor virus-Neu mice, in human HER2-positive breast cancer cell lines, and in ductal carcinoma in situ and invasive breast cancers from human patients. In breast cancer cells, ezrin co-localizes and interacts with HER2, NHERF1, PMCA2, and HSP90 in specialized membrane domains, and inhibiting ezrin disrupts interactions between HER2, PMCA2, NHERF1, and HSP90, inhibiting HER2 signaling and causing PKC alpha-mediated internalization and degradation of HER2. Inhibition of ezrin synergizes with lapatinib in a PKC alpha-dependent fashion to inhibit proliferation and promote apoptosis in HER2-positive breast cancer cells. We conclude that ezrin stabilizes a multiprotein complex that maintains active HER2 at the cell surface.
Files in This Item
There are no files associated with this item.
Appears in
Collections
3. Graduate School > Biomedical Research Center > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher Choi, Jungmin photo

Choi, Jungmin
College of Medicine (Department of Medical Informatics)
Read more

Altmetrics

Total Views & Downloads

BROWSE