Premium
Sustained contraction produced by caffeine after ryanodine treatment in the circular muscle of the guinea‐pig gastric antrum and rabbit portal vein
Author(s) -
Chowdhury J.U.,
Pang Y.W.,
Huang S.M.,
Tsugeno M.,
Tomita T.
Publication year - 1995
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1995.tb13363.x
Subject(s) - caffeine , ryanodine receptor , contraction (grammar) , antrum , medicine , endocrinology , muscle contraction , chemistry , guinea pig , verapamil , calcium , stomach
1 Caffeine inhibited spontaneous mechanical activity at 0.3‐1 mM, but produced a tonic contraction at concentrations higher than 3 mM in the circular muscle of the guinea‐pig gastric antrum. In the circular muscle of the rabbit portal vein, caffeine at concentrations higher than 1 mM produced an early phasic contraction followed by a small tonic component. The caffeine‐induced contraction was abolished by removal of the external Ca 2+ more rapidly in the gastric antrum than the portal vein. 2 When the preparations were pretreated with ryanodine (1 μm) a sustained contraction developed on wash‐out of caffeine (10 mM) both in the gastric antrum and portal vein. This contraction was not affected by nicardipine (3 μm) or verapamil (3 μm), but was readily abolished by removal of the external Ca 2+ or by addition of cobalt (1 mM). Spontaneous electrical activity, the slow wave, in gastric muscles was blocked in the presence of 10 mM caffeine, but reappeared during the sustained contraction. 3 Both the contractions induced directly by caffeine and those produced following caffeine wash‐out after ryanodine treatment were accompanied by a maintained increase in intracellular Ca 2+ concentration measured with fura‐2. 4 The presence or absence of Ca 2+ during the application of ryanodine did not affect the ability of caffeine to initiate sustained contractions, provided Ca 2+ was present during the exposure to caffeine. 5 It is concluded that caffeine can induce a sustained contraction after ryanodine treatment both in the guinea‐pig gastric antrum and rabbit portal vein, by activating a Ca 2+ influx pathway insensitive to organic Ca 2+ channel blockers. No clear evidence was obtained for involvement of the Ca 2+ influx pathway activated through depletion of intracellular Ca 2+ stores. A hypothesis is proposed that the plasma membrane of these preparations is similar to the sarcoplasmic reticulum membrane in that Ca 2+ permeability can be increased almost irreversibly by a combination of caffeine and ryanodine in the presence of the external Ca 2+ .