Suppression of polyamine biosynthesis prevents monocrotaline-induced pulmonary edema and arterial medial thickening.

Abstract:

:Previous work in our laboratory has shown that the continuous administration of alpha-difluoromethylornithine (DFMO), a highly specific irreversible inhibitor of ornithine decarboxylase (ODC), which is the rate-limiting enzyme in polyamine biosynthesis, prevented the development of pulmonary hypertension and right ventricular hypertrophy induced in rats 21 days after a single injection of monocrotaline (MCT). We now report that DFMO treatment did not influence the proposed first step of MCT pneumotoxicity, that is, the hepatic metabolism of MCT to toxic pyrrolic metabolites. In contrast, DFMO treatment blunted the development of lung perivascular edema at Day 7, inhibited the respective four- and twofold increases in lung putrescine and spermidine contents at Day 21 without significantly altering spermine content, and prevented the arterial medial thickening at Day 21. It thus appears that increased lung polyamine biosynthesis may be essential for the expression of MCT-induced perivascular edema as well as the development of the medial thickening stage of MCT-induced hypertensive pulmonary vascular disease.

journal_name

Toxicol Appl Pharmacol

authors

Olson JW,Atkinson JE,Hacker AD,Altiere RJ,Gillespie MN

doi

10.1016/0041-008x(85)90124-3

subject

Has Abstract

pub_date

1985-10-01 00:00:00

pages

91-9

issue

1

eissn

0041-008X

issn

1096-0333

pii

0041-008X(85)90124-3

journal_volume

81

pub_type

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