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. 1987 Nov 15;248(1):243–250. doi: 10.1042/bj2480243

Selective regulation of the amount of catalytic subunit of cyclic AMP-dependent protein kinases during isoprenaline-induced growth of the rat parotid gland.

G Schwoch 1
PMCID: PMC1148525  PMID: 2829821

Abstract

Stimulation of growth of the rat parotid gland by repeated injection of the beta-agonist isoprenaline led to a significant decrease in the activity of cyclic AMP-dependent protein kinases. Immunochemical quantification of the catalytic (C) and regulatory (RI and RII) subunits of the cyclic AMP-dependent protein kinases type I and type II revealed a loss of 65% of the immunochemically measurable amount of catalytic subunit C. The amount of the regulatory subunits, however, remained constant. The observed decrease in C-subunit was not due to a translocation of the molecule to cellular membranes or to an inhibiting effect of the heat-stable inhibitor of cyclic AMP-dependent protein kinases. A selective decrease in only the C-subunit was also observed after a brief exposure to isoprenaline leading to the stimulation of DNA synthesis. Under these conditions, the decrease was observed at the onset of DNA synthesis (17 h after injection), but not at the the time of an earlier small cyclic AMP peak (13 h after injection) or at the time of maximal DNA synthesis (24 h after injection). The results indicate that the amount of the catalytic subunit of cyclic AMP-dependent protein kinases can be regulated independently from that of the regulatory subunits. The time-limited occurrence of the specific change in the amount of the C-subunit suggests that such a regulation is of physiological significance and that it may participate in cyclic AMP-mediated events involved in the control of cellular proliferation.

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