Protein kinase C isoforms have differential roles in the regulation of human sebocyte biology

Tamás Géczy, Attila Oláh, Balázs I. Tóth, Gabriella Czifra, Attila G. Szöllsi, Tamás Szabó, Christos C. Zouboulis, Ralf Paus, Tamás Bíró

    Research output: Contribution to journalArticlepeer-review


    Protein kinase C (PKC) isoforms have crucial roles in cutaneous signaling. Interestingly, we lack information about their involvement in human sebaceous gland biology. Therefore, in this current study, we investigated the functions of the PKC system in human immortalized SZ95 sebocytes. Using molecular biological approaches, imaging, and functional assays, we report that SZ95 sebocytes express the conventional cPKCα; the novel nPKCδ, ε, and η; and the atypical aPKC. Activation of the PKC system by phorbol 12-myristate 13-acetate (PMA) stimulated lipid synthesis (a hallmark of differentiation) and resulted in translocation and then downregulation of cPKCα and nPKCδ. In good accord with these findings, the effect of PMA was effectively abrogated by inhibitors and short interfering RNA-mediated "silencing" of cPKCα and nPKCδ. Of further importance, molecular or pharmacological inhibition of nPKCδ also prevented the lipogenic and apoptosis-promoting action of arachidonic acid. Finally, we also found that "knockdown" of the endogenous aPKCδ activity markedly increased basal lipid synthesis and apoptosis, suggesting its constitutive activity in suppressing these processes. Collectively, our findings strongly argue for the fact that certain PKCs have pivotal, isoform-specific, differential, and antagonistic roles in the regulation of human sebaceous gland-derived sebocyte biology. © 2012 The Society for Investigative Dermatology.
    Original languageEnglish
    Pages (from-to)1988-1997
    Number of pages9
    JournalJournal of Investigative Dermatology
    Issue number8
    Publication statusPublished - Aug 2012


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