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Experimental dermatology

Loss of cell invasiveness through PKC-mediated syndecan-1 downregulation in melanoma cells under anchorage independency.


PMID 25236603

Abstract

Anchorage-independent survival is one of the key features for malignant tumor cells. Whether specific gene alterations contributed by anchorage independency would further affect metastatic phenotypes of melanoma cells was unclear. We adapted suspension culture of melanoma cells to establish anchorage independency. The suspended melanoma cells lost their invasive abilities in vitro. Specific loss of laminin-binding ability in suspended melanoma cells was observed, which was correlated with downregulation of syndecan-1 as revealed by microarray and validated by qPCR and Western blot. Modulation of syndecan-1 expression level affected laminin binding, transwell migration and matrix metalloproteinase-2 secretion in melanoma cells. SDC1 expression and transwell migration were correlated with activity or level of protein kinase Cδ as evidence by specific inhibitors and shRNA transfection. In this study, we compared metastatic phenotypes and gene expressions of adherent and suspended melanoma cells. The anchorage independency led to protein kinase Cδ-mediated syndecan-1 downregulation, which contributed to loss of laminin-binding ability, reduced metalloproteinase-2 secretion and loss of invasiveness.

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