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. 1989 Jun;86(12):4501–4504. doi: 10.1073/pnas.86.12.4501

Induction of exocytosis in permeabilized pituitary cells by alpha- and beta-type protein kinase C.

Z Naor 1, H Dan-Cohen 1, J Hermon 1, R Limor 1
PMCID: PMC287298  PMID: 2660139

Abstract

Protein kinase C is now recognized to comprise a family of closely related subspecies (PKCs). When cultured rat pituitary cells were permeabilized by digitonin for 5 min in the absence of Ca2+, endogenous PKC activity was decreased by 72%. PKC depletion was also achieved by prior treatment (24 hr) with high concentrations of phorbol 12-myristate 13-acetate (PMA). When purified activated brain PKCs were added for 30 min to PMA-pretreated, digitonin-permeabilized cells, only alpha- and beta- but not gamma-type PKC stimulated luteinizing hormone release. Since PKC was implicated as a mediator of gonadotropin secretion, gonadotropin-releasing hormone might utilize alpha- and beta-type PKCs for stimulation of gonadotropin secretion; alpha- and beta-type PKCs might participate also in other exocytotic responses in diverse biological systems in which PKC was implicated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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