PKCμ

PKCµ, now designated PKD1, is a diacylglycerol- and phorbol ester-responsive serine/threonine kinase with a distinctive catalytic domain[1]. Mechanistically, PKCµ/PKD1 regulates transport-carrier fission from the trans-Golgi network and links membrane trafficking to cell-surface delivery[2]. This trafficking role connects directly with cell adhesion because PKD1/PKCµ promotes αvβ3 integrin recycling and delivery to nascent focal adhesions[3]. In gastric cancer models, PKD1 promoter methylation correlated with reduced PKD1 expression, and PKD1 downregulation affected migration and invasiveness[4]. Compared with related isoforms, PKD1 and PKD2 show non-redundant functions in vivo, with PKD1 catalytic activity required for normal embryogenesis whereas PKD2 catalytic activity was dispensable for that process[5]. For experimental applications, PKD inhibitors provide tools to test PKD-dependent proliferation, migration, survival, and pathway activation in cancer models[6][7].