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Effect of parathyroid hormone on the transport of 45Ca2+ and 3H-GABA in nerve endings isolated from the rat cerebral cortex
Authors:V K Lutsenko  A S Ter-Markosian  N N Khlebnikova  D N Khudaverdian
Abstract:Parathyroid hormone (PTH) (0.1-10 ng/ml) evokes a dose-dependent increase in 45Ca2+ accumulation in synaptosomes isolated from the rat brain cortex. In the presence of PTH the fast (I sec) potential-dependent 45Ca2+ uptake was less than in the control. PTH had no effect on 3H-GABA uptake by synaptosomes (P2 fraction). Synaptosomes preincubated in the presence of PTH in Ca2+-free medium and transferred into Ca2+-containing normal medium released more 3H-GABA than control synaptosomes. In this case depolarization-evoked 3H-GABA release was diminished.
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