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Effects of Kappa Opioid Agonists Alone and in Combination With Cocaine on Heart Rate and Blood Pressure in Conscious Squirrel Monkeys

Effects of Kappa Opioid Agonists Alone and in Combination With Cocaine on Heart Rate and Blood Pressure in Conscious Squirrel Monkeys

Charles W Schindler, Zofi Graczyk, Joanne P Gilman, S Stevens Negus, Jack Bergman, Nancy K Mello, Steven R Goldberg

Eur J Pharmacol. 2007 Dec 8;576(1-3):107-13.

PMID: 17707792

Abstract:

As kappa agonists have been proposed as treatments for cocaine abuse, the cardiovascular effects of the kappa opioid receptor agonists ethylketocyclazocine (EKC) and enadoline were investigated in conscious squirrel monkeys. Both EKC and enadoline increased heart rate with little effect on blood pressure. This effect appeared to be specific for kappa receptors as the mu opioid agonist morphine did not mimic the effects of the kappa agonists. The opioid antagonist naltrexone, at a dose of 1.0 mg/kg, blocked the effect of EKC. An action at both central and peripheral receptors may be responsible for the heart rate increase following kappa agonist treatment. The ganglionic blocker chlorisondamine partially antagonized the effect of EKC on heart rate, suggesting central involvement, while the peripherally-acting agonist ICI 204,448 ((+/-)-1-[2,3- (Dihydro-7-methyl-1H-inden-4-yl)oxy]-3-[(1-methylethyl)amino]-2-butanol hydrochloride) also increased heart rate, supporting a peripheral site of action. When given in combination with cocaine, EKC produced effects that were sub-additive, suggesting that the kappa agonists may be used safely as cocaine abuse treatments.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP121264048	ICI 204,448 hydrochloride		121264-04-8	Price

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