Effects of papaverine on twitches in mouse diaphragm.

Abstract:

:This study examined the inhibitory effects of papaverine on twitches directly elicited by electrical stimulation of the mouse diaphragm. Papaverine (3-100 μM) inhibited twitches in a dose-dependent manner. Papaverine increased the cyclic adenosine monophosphate (cAMP) but not cyclic guanosine monophosphate (cGMP) content. IBMX, Db-cAMP and 8-br-cGMP did not affect twitches, whereas verapamil and NaCN inhibited twitches. Increases in extracellular Ca²+ removed the twitch inhibition caused by verapamil but not that caused by papaverine. Papaverine (30 and 100 μM) and NaCN (1 mM) decreased creatine phosphate and ATP contents. These results suggest that the relaxing effects of papaverine on mouse diaphragm are mainly due to inhibition of aerobic energy metabolism.

journal_name

Pharmacology

journal_title

Pharmacology

authors

Kaneda T,Hayasaka R,Nagai Y,Tajima T,Urakawa N,Nakajyo S,Shimizu K

doi

10.1159/000320769

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

273-80

issue

5-6

eissn

0031-7012

issn

1423-0313

pii

000320769

journal_volume

86

pub_type

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