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Abstract

ICI 147,798: a novel diuretic agent with beta adrenoceptor blocking activity.

S T Kau, B B Howe, J H Li, L H Smith, J R Keddie, J J Barlow, R E Giles and M E Goldberg
Journal of Pharmacology and Experimental Therapeutics September 1987, 242 (3) 818-826;
S T Kau
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B B Howe
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J H Li
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L H Smith
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J R Keddie
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J J Barlow
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R E Giles
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M E Goldberg
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Abstract

ICI 147,798 is a novel compound which has both diuretic and beta adrenoceptor blocking properties in a single molecule. The natriuretic activity at 30 mg/kg p.o. was about 65% of the hydrochlorothiazide value at 10 mg/kg p.o. in saline-loaded rats; the corresponding kaliuretic activity was 42%. The natriuretic and the kaliuretic activity of ICI 147,798 in dogs were similar to that of hydrochlorothiazide over the doses 1 to 20 mg/kg p.o., although significantly less kaliuresis was obtained with ICI 147,798 at 1 mg/kg p.o. In the toad bladder preparation (analogous to the distal mammalian nephron), ICI 147,798 inhibited Na+ transport with mucosal and serosal IC50 values of 56 and 120 microM, respectively. ICI 147,798 inhibited isoproterenol-induced tachycardia in rats, cats, guinea pigs and dogs; these effects were associated with antagonism of isoproterenol vasodepressor responses. The pKB values of ICI 147,798 were 9.1 and 8.8 in isolated right atria and trachea of guinea pigs, respectively. ICI 147,798 did not exhibit local anesthetic activity in rabbit cornea and intrinsic sympathomimetic activity in catecholamine-depleted dogs and rats. Duration of beta blockade after a p.o. dose of 1 mg/kg in dogs followed the sequence: nadolol greater than ICI 147,798 greater than atenolol greater than timolol greater than propranolol. It is concluded that ICI 147,798 is a novel diuretic agent with nonselective beta blockade, and it appears to have the potential of a direct tubular action.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 242, Issue 3
1 Sep 1987
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Abstract

ICI 147,798: a novel diuretic agent with beta adrenoceptor blocking activity.

S T Kau, B B Howe, J H Li, L H Smith, J R Keddie, J J Barlow, R E Giles and M E Goldberg
Journal of Pharmacology and Experimental Therapeutics September 1, 1987, 242 (3) 818-826;

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Abstract

ICI 147,798: a novel diuretic agent with beta adrenoceptor blocking activity.

S T Kau, B B Howe, J H Li, L H Smith, J R Keddie, J J Barlow, R E Giles and M E Goldberg
Journal of Pharmacology and Experimental Therapeutics September 1, 1987, 242 (3) 818-826;
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