Down-Regulation of Protein Kinase C-ε by Prolonged Incubation with PMA Inhibits the Proliferation of Vascular Smooth Muscle Cells
| Autor: | Huixuan Zhou, Yan Wang, Quanhong Zhou, Bin Wu, Aizhong Wang, Wei Jiang, Li Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Cellular Physiology and Biochemistry, Vol 40, Iss 1-2, Pp 379-390 (2016) |
| Druh dokumentu: | article |
| ISSN: | 1015-8987 1421-9778 39312879 |
| DOI: | 10.1159/000452553 |
| Popis: | Background/Aims: Phorbol myristate acetate (PMA) exerts a pleiotropic effect on the growth and differentiation of various cells. Protein kinase Cs (PKCs) plays a central role in mediating the effects of PMA on cells. The present study investigated whether the down-regulation of protein kinase C-ε (PKC-ε) is involved in the inhibition of vascular smooth muscle cell (VSMC) proliferation caused by prolonged PMA incubation. Methods: Using cell counting, Cell Counting Kit-8 (CCK-8) and EdU incorporation assay on VSMCs, we evaluated the inhibitory effects of prolonged incubation of PMA, of lentiviruses carrying the short-hairpin RNAs (shRNA) of PKC-ε and of the PKC-ε inhibitor peptide on the proliferation and viability of cells. The effect of PKC-ε down-regulation on growth of rat breast cancer SHZ-88 cells was also measured. Results: The prolonged incubation of VSMCs with PMA for up to 72 hours resulted in attenuated cell growth rates in a time-dependent manner. The expression of PKC-ε, as assessed by Western blotting, was also decreased accordingly. Notably, the number of EdU-positive cells and the cell viability of VSMCs were decreased by shRNA of PKC-ε and the PKC-ε inhibitor peptide, respectively. The proliferation of rat breast cancer SHZ-88 cells was also attenuated by lentivirus-induced shRNA silencing of PKC-ε. Conclusions: Prolonged incubation of PMA can inhibit the expression of PKC-ε. The effect results in the inhibition of VSMC proliferation. PKC-ε silencing can also attenuate breast cancer cell growth, suggesting that PKC-ε may be a potential target for anti-cancer drugs. |
| Databáze: | Directory of Open Access Journals |
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