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In unstimulated rat islets (2 mM glucose), most of the ion-exchange purified protein kinase C (PKC) activity was associated with the cytosolic fraction. Both carbachol and phorbol myristate acetate caused a significant translocation of PKC activity from cytosolic to membrane fractions, but under the same conditions, glucose (20 mM) did not cause such a redistribution of PKC activity. PMA-induced translocation...
The purpose of this study was to determine the role of protein kinase C (PKC) isozymes in carbachol-induced protein secretion in the lacrimal gland. Three isoforms of PKC are present in rat lacrimal gland: PKC-α, -δ and -g3. Carbachol translocated PKC- during 5 s incubation. Pretreatment with PdBu for 0 to 4 h down-regulated PKC-α by 31% at 20 min, PKC- by 36% at 2 h, and PKC-δ by 37% at 4 h....
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