Arsenazo III Ca2+-transients of Xenopus skeletal muscle during repetitive stimulation in hypertonic solution.
The arsenazo III Ca2+-transients (AZ signals) were measured in hypertonic solution. The muscle fiber of Xenopus was stimulated at the frequency of 0.1/s. The AZ signal responding to the first stimulus in hypertonic Ringer solution was nearly similar to that in normal Ringer solution. After 8 repetitive stimuli, however, time to peak was increased to 3 times and decay time constant was up to 4 times as long as the control. The apparent inhibition of Ca2+ uptake into sarcoplasmic reticulum was supposed to be the origin of the prolongation in time to peak and decay time course.
Ochi
K
K
Department of Physiology, Kawasaki Medical School, Kurashiki, Japan.
Matsumura
M
M
D000200:Action Potentials; D000818:Animals; D001150:Arsenazo III / Q000032:analysis*; D001391:Azo Compounds / Q000032:analysis*; D002118:Calcium / Q000032:analysis*; D004558:Electric Stimulation; D006982:Hypertonic Solutions; D009132:Muscles / Q000032:analysis / Q000502:physiology*; D013997:Time Factors; D014981:Xenopus / Q000502:physiology
D001391:Azo Compounds; D006982:Hypertonic Solutions; D001150:Arsenazo III; D002118:Calcium