Hyperoxia and recovery from hypoxia alter collagen in peripheral pulmonary arteries similarly

Title:

Hyperoxia and recovery from hypoxia alter collagen in peripheral pulmonary arteries similarly

Creator:

Novotná, J., Jana Bíbová, Václav Hampl, Zdeněk Deyl, and Jan Herget

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:051a4cce-8f05-4c64-b069-6190f2928237
uuid:051a4cce-8f05-4c64-b069-6190f2928237
issn:0862-8408

Subject:

Fyziologie člověka a srovnávací fyziologie, kolagen, plicní hypertenze, collagen, pulmonary hypertension, chronic hypoxia, metalloproteinases, vascular remodeling, rat, 14, and 612

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

a1_Chronic hypoxia causes pulmonary hypertension, the mechanism of which includes altered collagen metabolism in the pulmonary vascular wall. This chronic hypoxic pulmonary hypertension is gradually reversible upon reoxygenation. The return to air after the adjustment to chronic hypoxia resembles in some aspects a hyperoxic stimulus and we hypothesize that the changes of extracellular matrix proteins in peripheral pulmonary arteries may be similar. Therefore, we studied the exposure to moderate chronic hyperoxia (FiO2 = 0.35, 3 weeks) in rats and compared its effects on the rat pulmonary vasculature to the effects of recovery (3 weeks) from chronic hypoxia (FiO2 = 0.1, 3 weeks). Chronically hypoxic rats had pulmonary hypertension (Pap = 26±3 mm Hg, controls 16±1 mm Hg) and right ventricular hypertrophy. Pulmonary arterial blood pressure and right ventricle weight normalized after 3 weeks of recovery in air (Pap = 19±1 mm Hg). The rats exposed to moderate chronic hyperoxia also did not have pulmonary hypertension (Pap = 18±1 mm Hg, controls 17±1 mm Hg). Collagenous proteins isolated from the peripheral pulmonary arteries (100-300 mm) were studied using polyacrylamide gel electrophoresis. A dominant low molecular weight peptide (approx. 76 kD) was found in hypoxic rats. The proportion of this peptide decreases significantly in the course of recovery in air. In addition, another larger peptide doublet was found in rats recovering from chronic hypoxia. It was localized in polyacrylamide gels close to the zone of a2 chain of collagen type I. It was bound to anticollagen type I antibodies. An identically localized peptide was found in rats exposed to moderate chronic hyperoxia. The apparent molecular weight of this collagen fraction suggests that it is a product of collagen type I cleavage by a rodent-type interstitial collagenase (MMP-13)., a2_We conclude that chronic moderate hyperoxia and recovery from chronic hypoxia have a similar effect on collagenous proteins of the peripheral pulmonary arterial wall., J. Novotná, J. Bíbová, V. Hampl, Z. Deyl, J. Herget., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2001 Volume:50 | Number:2

Harvested from:

CDK

Metadata only:

false