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Prolonged reduction in serum angiotensin converting enzyme activity after treatment of rabbits with bleomycin.

Abstract：

:Previous work from this laboratory (J. S. Lazo, J. D. Catravas, and C. N. Gillis, Biochem. Pharmacol. 30, 2577-2584, 1981; J. D. Catraveras, J. S. Lazo, and C. N. Gillis, J. Pharmacol. Exp. Ther. 217, 524-529, 1981) demonstrated that subacute bleomycin (BLM) administration (5 mg/kg) to rabbits three times weekly for 4 weeks produced a marked decrease in serum angiotensin converting enzyme (ACE) activity in addition to producing both morphological and biochemical evidence of pulmonary endothelial damage. In this work, the reversibility of the decreased serum ACE activity and the biochemical and morphological status of the pulmonary endothelium after a substantial drug-free period in rabbits was examined. Rabbits were injected sc three times weekly for 4 weeks with vehicle or BLM (5 mg/kg) and then maintained drug free for an additional 6 or 7 weeks. Serum ACE activity decreased over 60% during the BLM treatment but did not return to control levels at any time during the drug-free period. The pulmonary endothelium, however, appeared undamaged. No decrease in pulmonary ACE activity was detected either in vitro or in vivo nor was the single-pass pulmonary removal in vivo of [3H]norepinephrine and 5-[14C]hydroxytryptamine different between BLM-treated and control rabbits after the drug-free period. In addition, no evidence of pulmonary endothelial damage was observed by light and electron microscopy. Thus, reduction in serum ACE activity appears to be a durable reflection of BLM toxicity in rabbits that persists even in the absence of any detectable biochemical or morphologic endothelial injury.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Lazo JS,Catravas JD,Dobuler KJ,Gillis CN

doi

10.1016/0041-008x(83)90309-5

subject

Has Abstract

pub_date

1983-06-30 00:00:00

pages

276-82

issue

2

eissn

0041-008X

issn

1096-0333

pii

0041-008X(83)90309-5

journal_volume

69

pub_type

杂志文章

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