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- W2404779423 abstract "The aim of the present study was to investigate, whether concomitant administration of the synthetic glucocorticoid betamethasone (BM), theophylline (THEO), or the muscarinic antagonist ipratropium bromide (IPRA) could influence the desensitization-associated decrease of β-adrenoceptors in the guinea pig lung during prolonged in vivo treatment with the β2-agonist terbutaline (TER). The animals were sacrificed 20 hrs after the last drug dosage and the lung membrane homogenates were prepared for 3H-dihydroalprenolol (3H-DHA) binding in vitro. Treatment with TER 200 µg/kg subcutaneously twice a day for five days decreased by 22% the maximum number of binding sites (Bmax) at saturation in comparison with the saline-treated controls. Concomitant administration of BM 2 mg/kg intraperitoneally abolished this effect of TER, whereas THEO 20 mg/kg or IPRA 5 µg/kg failed to modify it. None of the in vivo treatments affected the binding affinity of 3H-DHA. In vitro, TER inhibited in a concentration-dependent manner 3H-DHA binding to the lung membranes of untreated guinea pigs. At high concentrations IPRA, but not THEO or BM, showed some binding to the β-receptors as well. Thus, it is concluded that glucocorticoids may prevent β-adrenoceptor desensitization in the lungs via an indirect mechanism, e.g. inhibition of phospholipase A2 enzyme." @default.
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- W2404779423 title "Concomitant Glucocorticoid Treatment Prevents the Development of β-Adrenoceptor Desensitization in the Guinea Pig Lung" @default.
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- W2404779423 doi "https://doi.org/10.1111/bcpt.1985.57.3.147" @default.
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