The inotropic vasodilator, ICI 153,110, a phosphodiesterase inhibitor intended for the treatment of congestive heart failure, was administered to Alderley Park Wistar-derived rats for periods of up to 182 days. Treatment produced hypertrophy of salivary glands, hyperplasia of intestinal mucosa, and dacryoadenitis of the harderian gland. As the functions of these glandular tissues can be modified by factors which alter cyclic nucleotide metabolism, it is postulated that the glandular alterations produced by ICI 153,110 occurred as a result of phosphodiesterase inhibition.

01 Feb 1991·Biochemical PharmacologyQ2 · MEDICINE

Different inhibition and induction profiles of hepatic drug metabolism in rats and dogs by two structurally related pyridyl diazinone cardiotonic agents

Q2 · MEDICINE

Article

Author: David McKillop ; Kathryn J. Pickup

ICI 153,110 and ICI 170,777, two pyridyl diazinone cardiotonic agents, produced a different profile of effects on hepatic microsomal mixed function oxidase enzymes following multiple oral dosing to rats and dogs; these differences may be related to the molecular dimensions of the two molecules. ICI 153,110 significantly increased levels of total P450, ethoxycoumarin O-deethylase and ethoxyresorufin O-deethylase in rat microsomes, indicating an induction profile (P448) similar to that of beta-naphthoflavone. This was supported by gel electrophoresis (SDS-PAGE) of microsomal proteins; a similar type of induction was observed in dog microsomes. In contrast, ICI 170,777 produced no changes indicating enzyme induction in either rat or dog. Instead, ICI 170,777 appeared to inhibit specifically the activity of aldrin epoxidase in the rat. Inhibitory activity was also indicated in the rat by prolongation of pentobarbitone sleeping time following single oral doses of either ICI 153,110 or ICI 170,777. The time-course of this effect appeared to correlate more closely with the profile of circulating metabolites, although both parent compounds were found to produce type II spectral changes on interaction with control rat microsomes. The molecular dimensions (area/depth2) of the compounds supported the finding that only ICI 153,110 should interact with or induce P448 isozymes.

01 Sep 1990·Journal of Cardiovascular PharmacologyQ4 · MEDICINE

Acute Neurohormonal and Hemodynamic Response to a New Peak III Phosphodiesterase Inhibitor (ICI 153,110) in Patients with Chronic Heart Failure

Q4 · MEDICINE

Article

Author: Budzinski, D ; Reddy, B R ; Levine, T B ; Jafri, S M ; Goldberg, A D ; Pilla, A

Peak III phosphodiesterase (PDE) inhibitors have combined positive inotropic and vasodilator effects. We studied 10 patients with chronic heart failure during and after infusion of intravenous (i.v.) ICI 153,110, an investigational peak III PDE inhibitor. Maximum hemodynamic response for the group occurred after cessation of infusion at a lower plasma drug concentration. At maximum hemodynamic response, cardiac index (CI) increased (2.4 +/- 0.5 vs. 3.2 +/- 0.37 L/min/m2, p less than 0.05) with a decrease in mean arterial pressure (MAP 91 +/- 5 vs. 80 +/- 3 mm Hg, p less than 0.05), pulmonary capillary wedge pressure (PCWP 25 +/- 2 vs. 17 +/- 3.1 mm Hg, p less than 0.01), systemic vascular resistance (SVR 1,422 +/- 106 vs. 983 +/- 97 dynes.s.cm-5, p less than 0.05) and pulmonary vascular resistance (PVR 227 +/- 39 vs. 16 +/- 31 dynes.s.cm-5, p less than 0.05). During the infusion, plasma renin activity (PRA) decreased from 6.34 +/- 2.53 to 3.6 +/- 3 ng/ml/h (NS). The five patients with high baseline PRA had a significant decrease (11.2 +/- 2.5 vs. 5.4 +/- 1.67 ng/ml/h, p less than 0.01) that preceded changes in CI and SVR by 1-2 h. These data suggest that reduction in PRA may have contributed to the hemodynamic effects of this peak III PDE inhibitor.

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Indication	Highest Phase	Country/Location	Organization	Date
Heart Failure	Preclinical	GB	AstraZeneca PLC	-

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