Abstract
The effects of i.v.c. injection of human and salmon calcitonin on biochemical and behavioral parameters related to the extrapyramidal motor system, were investigated in male rats. Calcitonin injection resulted in a potentiation of haloperidol-induced catalepsy and a partial prevention of apomorphine-induced hyperactivity. Moreover calcitonin induced a significant decrease in nigral GAD activity but no change in striatal DA and DOPAC concentration or GAD activity. The results are discussed in view of a primary action of calcitonin on the striatonigral GABAergic pathway mediating the DA-related behavioral messages of striatal origin.
MeSH terms
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3,4-Dihydroxyphenylacetic Acid / metabolism
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Animals
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Apomorphine / pharmacology
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Calcitonin / pharmacology*
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Corpus Striatum / drug effects*
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Dopamine / metabolism
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Extrapyramidal Tracts / drug effects*
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Glutamate Decarboxylase / metabolism
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Haloperidol / pharmacology
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Injections, Intraventricular
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Male
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Motor Activity / drug effects*
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Motor Neurons / drug effects
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Rats
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Rats, Inbred Strains
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Receptors, Cell Surface / drug effects
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Receptors, Dopamine / drug effects
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Receptors, GABA-A
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Substantia Nigra / drug effects*
Substances
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Receptors, Cell Surface
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Receptors, Dopamine
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Receptors, GABA-A
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3,4-Dihydroxyphenylacetic Acid
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Calcitonin
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Glutamate Decarboxylase
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Haloperidol
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Apomorphine
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Dopamine