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. 1992 Apr 15;283(Pt 2):341–346. doi: 10.1042/bj2830341

Glucagon, vasopressin and angiotensin all elicit a rapid, transient increase in hepatocyte protein kinase C activity.

E K Tang 1, M D Houslay 1
PMCID: PMC1131039  PMID: 1575678

Abstract

Challenge of intact hepatocytes with one of the hormones vasopressin, angiotensin and glucagon or with the phorbol ester phorbol 12-myristate 13-acetate (PMA) led to a rapid increase in the activity of protein kinase C found in both cytosol and membrane fractions. Maximal activation by hormones occurred within 1-6 min of challenge of cells, after which activity declined. In membrane fractions protein kinase C activity return to basal levels some 15 min after exposure of cells to either angiotensin or glucagon. In cytosol fractions of cells challenged with hormones a second phase of activation ensued after about 10 min, with levels of protein kinase C activity remaining elevated above basal level 15 min afterwards. Activity changes elicited by PMA were rather different; it took about 15 min to achieve maximal activation of cytosolic protein kinase C activity. In membranes of cells challenged with PMA, an initial rapid and transient activation was followed by a sustained increase in activity occurring about 10 min after exposure of cells to this ligand. Only when hepatocytes were challenged with PMA was the translocation of protein kinase C from the cytosol to membrane fraction observed. The kinetics of PMA-induced translocation suggested that it accounted for the second phase of the increase in membrane protein kinase C activity which was unique to this ligand.

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Selected References

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