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A Met-enkephalin releaser (kyotorphin)-induced release of plasma membrane-bound Ca2+ from rat brain synaptosomes

, : A Met-enkephalin releaser (kyotorphin)-induced release of plasma membrane-bound Ca2+ from rat brain synaptosomes. Brain Research 419(1-2): 197-200

The neuropeptide kyotorphin (Tyr-Arg) released 45Ca2+ from synaptosomal membrane preparations of the rat lower brainstem. This dipeptide also decreased plasma membrane-bound Ca2+ ([Ca2+]m), determined using chlorotetracycline, in the slice and synaptosome of the rat lower brainstem. Taken together with other data indicating that kyotorphin induces an increase in synaptosomal intracellular Ca2+ ([Ca2+]i) in a Ca2+ channel-independent manner, it is suggested that kyotorphin may mobilize the [Ca2+]m and thus increase the [Ca2+]i in the nerve terminals of the rat lower brainstem.


PMID: 3676725

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