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Effect of Rp diastereoisomer of adenosine 3',5' cyclic-monophosphothioate on the cAMP-dependent relaxation of smooth muscle.

Abstract：

:The effect of Rp diastereoisomer of adenosine 3',5'-cyclic monophosphothioate (Rp-cAMPS) on relaxation elicited by histamine (1-100 microM), forskolin (1-60 microM), papaverine (1-100 microM), vinpocetine (1-100 microM), rolipram (0.1-1 mM), Sp-cAMPS (10-300 microM), 8-BrcAMP (10 microM - 1 mM) and 8-BrcGMP (3 microM - 1 mM) of the previous vanadate-induced contraction was assayed. The effect of Rp-cAMPS on the relaxing effect produced by forskolin, papaverine, vinpocetine, rolipram, Sp-cAMPS and 8-BrcAMP in KCl-induced tonic contraction was also assayed. Histamine, forskolin, papaverine, rolipram, Sp-cAMPS, 8-BrcAMP and 8-BrcGMP, but not vinpocetine, relaxed the vanadate-induced contractions in rat uterus incubated in medium lacking calcium plus EDTA in a concentration-dependent way. Rp-cAMPS (1-300 microM) had no effect on vanadate contraction. However, it antagonized the relaxation elicited by histamine and papaverine, but not that of forskolin, rolipram, Sp-cAMPS, 8-BrcAMP and 8-BrcGMP. Forskolin, papaverine, vinpocetine, rolipram and 8-BrcAMP, but not Sp-cAMPS, relaxed the KCl-induced contraction. Rp-cAMPS antagonized the relaxation elicited by forskolin, papaverine and vinpocetine, but not that of rolipram and 8-BrcAMP. Our results suggest that: a) Rp-cAMPS is an effective PKA inhibitor that could be used to study the involvement of cAMP on drug-induced response in smooth muscle, and b) the effects of Sp-cAMPS, 8-BrcAMP and rolipram were independent of the activation of protein kinases.

journal_name

Life Sci

journal_title

Life sciences

authors

Perez-Vallina JR,Revuelta MP,Cantabrana B,Hidalgo A

doi

10.1016/s0024-3205(97)00589-4

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

869-80

issue

9

eissn

0024-3205

issn

1879-0631

pii

S0024320597005894

journal_volume

61

pub_type

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