Linked Life Data

19357285

Source:http://linkedlifedata.com/resource/pubmed/id/19357285

Statements in which the resource exists.
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pubmed-article:19357285pubmed:abstractTextMMPs (matrix metalloproteinases) and the related "a disintegrin and metalloproteinases" (ADAMs) promote tumorigenesis by cleaving extracellular matrix and protein substrates, including N-cadherin. Although N-cadherin is thought to regulate cell adhesion, migration, and invasion, its role has not been characterized in glioblastomas (GBMs). In this study, we investigated the expression and function of posttranslational N-cadherin cleavage in GBM cells as well as its regulation by protein kinase C (PKC). N-Cadherin cleavage occurred at a higher level in glioblastoma cells than in non-neoplastic astrocytes. Treatment with the PKC activator phorbol 12-myristate 13-acetate (PMA) increased N-cadherin cleavage, which was reduced by pharmacological inhibitors and short interfering RNA (siRNA) specific for ADAM-10 or PKC-alpha. Furthermore, treatment of GBM cells with PMA induced the translocation of ADAM-10 to the cell membrane, the site at which N-cadherin was cleaved, and this translocation was significantly reduced by the PKC-alpha inhibitor Gö6976 [12-(2-cyanoethyl)-6,7,12,13-tetrahydro-13-methyl-5-oxo-5H-indolo[2,3-a]pyrrolo[3,4-c]carbazole] or PKC-alpha short hairpin RNA. In functional studies, N-cadherin cleavage was required for GBM cell migration, as depletion of N-cadherin cleavage by N-cadherin siRNA, ADAM-10 siRNA, or a cleavage-site mutant N-cadherin, decreased GBM cell migration. Together, these results suggest that N-cadherin cleavage is regulated by a PKC-alpha-ADAM-10 cascade in GBM cells and may be involved in mediating GBM cell migration.lld:pubmed
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