CALCIUM DEPLETION OF SYNAPTOSOMES AFTER MORPHINE TREATMENT

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Abstract
It was confirmed that morphine administration in vivo produced a selective decrease in the calcium content of synaptosomal fractions prepared from rat cerebral cortices. This effect was prevented by naloxone. After morphine or naloxone, there were no changes in the sodium, potassium and magnesium contents of any of the seven subcellular fractions tested. Since the selective calcium loss was found to occur from fractions similar to those reported to exhibit opiate receptor binding, it is concluded that calcium may play a role in the action of narcotic agonist drugs.

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