Downregulation of erythropoietin receptor by overexpression of phospholipase C-gamma 1 is critical for decrease on focal adhesion in transformed cells
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- Downregulation of erythropoietin receptor by overexpression of phospholipase C-gamma 1 is critical for decrease on focal adhesion in transformed cells
- Kang, Jin Ku; Chang, Chang-Hyun; Nam, Hyo Jung; Kim, Sung-Kuk; Ahn, Keun Jae; Seok, Heon; Park, Sang Joon; Kang, Yoon Joong; Jo, Young Suk; Shong, Minho; Kim, Ho
- Issue Date
- CELLULAR ONCOLOGY, v.34, no.1, pp.11 - 21
- Background Phospholipase C-gamma 1 (PLC-gamma 1) is known to play a critical role in cell adhesion and migration and is highly expressed in metastatic tumors. In the current study, we found that cells transformed by PLC-gamma 1 overexpression (PLC-gamma 1 cells) exhibited a marked decrease in expression of the Epo receptor (EpoR). Here, we assessed the role of EpoR-dependent signaling pathways in PLC-gamma 1-dependent regulation of cell adhesion and migration.
Methods Expression and phosphorylation of EpoR and its functional role in PLC-gamma 1 cells were evaluated by immunoblot analysis or cell adhesion assay. The mechanism for PLC-gamma 1-induced EpoR downregulation was analyzed by blockage of proteosomal degradation with MG132. EpoR expression was also confirmed in colorectal cancer tissues in which PLC-gamma 1 was highly expressed.
Results EpoR was present on rat fibroblasts, where it functionally active and capable of increasing cell adhesion and migratory activity. However, PLC-gamma 1 cells significantly decreased the Epo-dependent effects via ubiquitination-proteosomal degradation of EpoR. A marked decrease of EpoR expression was confirmed in colorectal cancer tissues that showed high-level of PLC-gamma 1 expression.
Conclusion The Epo/EpoR complex plays a critical role in the adhesion and migration of rat fibroblasts, and its functional inactivation is associated with PLC-gamma 1-dependent reduction of cell-matrix adhesion and this also affects cell migration.
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