Linked Life Data

10598575

Source:http://linkedlifedata.com/resource/pubmed/id/10598575

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pubmed-article:10598575pubmed:abstractTextDuring pregnancy in the rat, there is a change in the ability of chlorophenylthio (CPT)-cAMP to inhibit myometrial phosphatidylinositide turnover. This is accompanied by a change in the association of proteins with a plasma membrane A kinase anchoring protein (AKAP). Both CPT-cAMP and isoproterenol inhibited oxytocin-stimulated phosphatidylinositide turnover on days 12 through 20 of gestation, whereas neither agent had an effect on day 21. Accompanying this change was a dramatic decrease in the concentration and activity of cAMP-dependent protein kinase [protein kinase A (PKA)] and an increase in the concentration of protein phosphatase 2B (PP2B) in plasma membranes from day 21 compared with day 19 pregnant rats. In contrast, both PKA and PP2B concentrations and activities increased in total myometrial homogenates. Both PKA and PP2B coimmunoprecipitated with an antibody against the 150-kDa AKAP found in rat myometrial plasma membranes. More PKA was associated with AKAP150 on day 19 than on day 21, while the reverse was true for PP2B. Disruption of PKA/AKAP association in day 19 pregnant rat myometrial cells with the specific interaction inhibitor peptide S-Ht31 resulted in the loss of the cAMP-inhibitory effect on phosphatidylinositide turnover. PP2B activity in myometrial homogenates dephosphorylated PLCbeta3, a PKA substrate targeted in the inhibition of Galphaq-stimulated phosphatidylinositide turnover. The dramatic loss of the cAMP-inhibitory effect on day 21 of pregnancy may alter the balance between uterine contraction and relaxation near parturition. The changes in the relative concentrations of PKA and PP2B associated with AKAP150 are consistent with a functional role for AKAP150 scaffolding in the alteration of cellular signaling.lld:pubmed
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pubmed-article:10598575pubmed:articleTitleA role for AKAP (A kinase anchoring protein) scaffolding in the loss of a cyclic adenosine 3',5'-monophosphate inhibitory response in late pregnant rat myometrium.lld:pubmed
pubmed-article:10598575pubmed:affiliationDepartment of Biochemistry and Molecular Biology, University of Texas Medical School at Houston, 77030, USA.lld:pubmed
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