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Selective Depleting Effect of Syrosingopine on Brain Catecholamine Levels With Relation to Morphine Analgesia in the Rat

Selective Depleting Effect of Syrosingopine on Brain Catecholamine Levels With Relation to Morphine Analgesia in the Rat

T Furukawa, T Sano, Y Kohno, M Koga, N Nagasaki

Pharmacol Biochem Behav. 1976 Apr;4(4):419-25.

PMID: 6976

Abstract:

Reserpine was the most potent, rescinnamine the next and syrosingopine the weakest in the depleting effects on brain amines of rauwolfia alkaloids. After syrosingopine, brain dopamine (DA) was decreased to a smaller degree and with a shorter duration as compared with norepinephrine (NE) and serotonin (5-HT), whereas reserpine elicited a marked and long lasting reduction in these amines. Accordingly, syrosingopine induced a depletion of brain NE and 5-HT without alteration in brain DA content 2-4 days after administration. Repeated administrations of syrosingopine, 2 mg/kg daily for 2 or 4 days, resulted in similar alterations in brain amine levels. This selective depleting effect of syrosingopine on brain amines was potentiated by combined treatment with disulfiram or fusaric acid, a dopamine beta-hydroxylase inhibitor. Under the condition of selective depletion of brain amines induced by repeated administrations of syrosingopine, 2 mg/kg daily for 2 days, the analgesic action of morphine was not affected, whereas reserpine and tetrabenazine antagonized morphine analgesia, concomitant with inducing a depletion of all brain amines. The results suggest that brain DA may be more important than brain NE or 5-HT with regard to the mechanisms by which morpine produces analgesia.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP84366	Syrosingopine		84-36-6	Price

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