TY - JOUR
T1 - Verapamil decreases lymphocyte protein kinase C activity in humans
AU - Depetrillo, Paolo B.
AU - Abernethy, Darrell R.
AU - Wainer, Irving W.
AU - Andrawis, Nabil S.
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1994/1
Y1 - 1994/1
N2 - To determine if clinically used doses of the calcium antagonist verapamil measurably alter intracellular transduction mechanisms associated with the phosphatidylinositol pathway, lymphocyte protein kinase C activity was determined in subjects in a drug‐free state, after 1 week of verapamil treatment (120 mg three times daily) and after a second week of verapamil treatment (240 mg sustained‐release preparation once daily). Nine healthy male volunteers were studied and in these subjects baseline protein kinase C activity (mean ± SEM; 5.07 ± 0.76 pmol/μg protein/min) tended to decrease after 1 week (3.50 ± 0.20 pmol/μg protein/min) and was significantly decreased after 2 weeks (3.14 ± 0.27 pmol/μg protein/min; p < 0.05 from baseline) of verapamil treatment. These data indicate that verapamil, at usual clinical doses, decreases protein kinase C activity in a marker tissue, the circulating lymphocyte. If protein kinase C activity in this tissue is a surrogate for other verapamil target tissues, such as vascular smooth muscle and heart muscle, these findings may provide insight into the in vivo mechanism by which verapamil decreases protein synthesis, limits cell growth, and reverses cellular hypertrophy in these tissues. Clinical Pharmacology and Therapeutics (1994) 55, 44–49; doi:
AB - To determine if clinically used doses of the calcium antagonist verapamil measurably alter intracellular transduction mechanisms associated with the phosphatidylinositol pathway, lymphocyte protein kinase C activity was determined in subjects in a drug‐free state, after 1 week of verapamil treatment (120 mg three times daily) and after a second week of verapamil treatment (240 mg sustained‐release preparation once daily). Nine healthy male volunteers were studied and in these subjects baseline protein kinase C activity (mean ± SEM; 5.07 ± 0.76 pmol/μg protein/min) tended to decrease after 1 week (3.50 ± 0.20 pmol/μg protein/min) and was significantly decreased after 2 weeks (3.14 ± 0.27 pmol/μg protein/min; p < 0.05 from baseline) of verapamil treatment. These data indicate that verapamil, at usual clinical doses, decreases protein kinase C activity in a marker tissue, the circulating lymphocyte. If protein kinase C activity in this tissue is a surrogate for other verapamil target tissues, such as vascular smooth muscle and heart muscle, these findings may provide insight into the in vivo mechanism by which verapamil decreases protein synthesis, limits cell growth, and reverses cellular hypertrophy in these tissues. Clinical Pharmacology and Therapeutics (1994) 55, 44–49; doi:
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U2 - 10.1038/clpt.1994.8
DO - 10.1038/clpt.1994.8
M3 - Article
C2 - 8299315
AN - SCOPUS:0027955092
VL - 55
SP - 44
EP - 49
JO - Clinical Pharmacology and Therapeutics
JF - Clinical Pharmacology and Therapeutics
SN - 0009-9236
IS - 1
ER -