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Coronary Arteriopathy in Monkeys Following Administration of CI-1020, an Endothelin A Receptor Antagonist
Mudher A. Albassam
Parke-Davis Research Institute, Mississauga, Ontario, Canada L5K 1B4
Alan L. Metz
Parke-Davis Pharmaceutical Research Division, Ann Arbor, Michigan, USA
Norbert J. Gragtmans
Parke-Davis Research Institute, Mississauga, Ontario, Canada L5K 1B4
Lena M. King
Parke-Davis Research Institute, Mississauga, Ontario, Canada L5K 1B4
Grace E. Macallum
Parke-Davis Research Institute, Mississauga, Ontario, Canada L5K 1B4
Hussein Hallak
Parke-Davis Pharmaceutical Research Division, Ann Arbor, Michigan, USA
Edward J. McGuire
Parke-Davis Research Institute, Mississauga, Ontario, Canada L5K 1B4
A selective non-peptide endothelin A (ETA) receptor antagonist, CI-1020, was administered to cynomolgus monkeys intravenously (iv) for 2 or 4 wk and orally for 4 wk. Groups consisting of 3 animals of each sex received CI-1020 at 1, 5, and 10 mg/kg/hr (iv) or orally at 250, 500, and 750 mg/kg body weight for 4 wk. Control animals received the vehicle only. In a separate experiment, 1 male was infused with 10 mg/kg/hr for 2 wk, and Monastral blue dye was administered iv to facilitate localization of lesions to the vascular walls. One female was administered saline and the dye and served as a control. One female at 1 mg/kg/hr was found dead at week 2, and 1 female at 5 mg/kg/hr was euthanatized during week 4 as a result of severe thigh swelling at the catheter site. Macroscopically, extramural coronary arteries appeared thickened and nodular in the 4-wk iv study in the female found dead at 1 mg/kg/hr, in 1 male and 1 female at 5 mg/kg/hr, and in 2 females at 10 mg/kg/hr. Histologically, Monastral blue pigment trapped in the walls of coronary arteries with arteriopathy was observed in the male treated with CI-1020 at 10 mg/kg/hr for 2 wk. Extramural coronary arteriopathy occurred at all doses in the 4-wk iv study, with higher incidence occurring in females than in males (7 of 9 treated females compared with 3 of 9 treated males). In the oral study, 1 female at 500 mg/kg/day and 1 male and 2 females at 750 mg/kg/day had coronary arteriopathy. Histological changes after 2 wk of treatment were characterized by intimal thickening, fragmentation of the internal elastic lamina, necrosis and edema of the media, and mixed inflammatory-cell infiltrates in the intima, media, and adventitia. After 4 wk of iv administration, arteriopathy was characterized by segmental disruption of the elastic lamina and intimal and medial fibrosis with complete replacement of smooth muscle with fibrous tissue. The adventitia was thickened as a result of fibrosis and mixed or mononuclear inflammatory-cell infiltrates. CI-1020 concentrations were higher in males (1.57 to 29 µg/ml) than in females (0.974 to 24.4 µg/ml) in the iv study. Transient systemic exposure with high maximum plasma concentration (Cmax) (120-352 µg/ml) in the oral study was insufficient to provoke arterial changes of the same magnitude as those noted with continuous iv administration. The regeneration of the media by fibrous tissue and the disruption of the elastic lamina may weaken the arterial wall and increase the susceptibility of the artery to the development of aneurysm.
Key Words: Endothelin A • arteriopathy • medial necrosis • vasculitis • arteritis • endothelin receptor blockade • PD 156707
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Toxicologic Pathology, Vol. 27, No. 2,
156-164 (1999)
DOI: 10.1177/019262339902700202
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