ISSN:
1471-4159
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Medicine
Notes:
Abstract: The effect of adenosine on 45Ca2+ uptake by rat brain synaptosomes stimulated by electrical pulses was investigated. 45Ca2+ uptake was voltage dependent. Adenosine (1 μM-1 μM) decreased the uptake of 45Ca2+ induced by electrical stimulation (amplitude, 20 V; duration, 400 pμs; frequency, 10 pulses/s) in a concentration-dependent manner. At a concentration of 1 μM, adenosine almost abolished the 45Ca2+ uptake induced by electrical stimulation (92.9 ± 5.3% inhibition), but when the calcium uptake was induced by high-K+ (60 mM) medium, the effect of adenosine (1 μM) was smaller (43.8 ± 5.2% inhibition). The inhibitory effect of 1 μM adenosine on calcium uptake induced by electrical stimulation was antagonized by 1,3-dipropyl-8-p-sulfophenylxanthine (5 μM). The possibility that adenosine interacts with the calcium channels opened by electrical stimulation is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1471-4159.1991.tb02079.x
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