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International Journal of Physiology and Pathophysiology

年間 4 号発行

ISSN 印刷: 2155-014X

ISSN オンライン: 2155-0158

SJR: 0.116

Effect of Staphylococcus aureus Cell-Wall Peptidoglycan on the Rat Myometrial Contractility Regulation by Adenylate Cyclase Signaling System

巻 8, 発行 1, 2017, pp. 65-76
DOI: 10.1615/IntJPhysPathophys.v8.i1.70
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要約

Impact of Staphylococcus aureus cell-wall peptidoglycan on some links of Adenylate cyclase messenger system in the rat myometrial contractility was studied. Spontaneous and prostaglandin F2α-induced contractions of the myometrium were inhibited by non-selective adrenoceptor agonist noradrenaline and selective agonist of β2-adrenergic receptors salbutamol. Under this conditions peptidoglycan application fully restored myometrial contractility. The similar effect was observed after activating adenylate cyclase by forskolin. Simultaneously when myometrial contractions were reduced via increasing the intracellular cyclic adenosine monophosphate (cAMP) by applying either 8-bromo-cAMP or papaverin, a non-selective inhibitor of cAMP-dependent phosphodiesterases, the effect of peptidoglycan was absent. Given the activation of Gs-protein by cholera toxin, peptidoglycan restored spontaneous activity and strengthened prostaglandin-induced contractions. Downregulation of Gi/o-protein by pertussis toxin evoked loss of capacity of peptidoglycan to restore spontaneous and induced contractile activities of the myometrium, suppressed by applying β-adrenergic agonists or forskolin. Thus, the effect of peptidoglycan on the rat myometrium contractility is associated with its ability to cause rapid desensitization of adenylate cyclase due to increased functional activity of Gi-protein.

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