Vascular permeability and late radiation fibrosis in mouse lung.

Abstract:

:It has been suggested that fibrosis which develops after irradiation is caused by increases in vascular permeability. Plasma proteins leak into irradiated tissue where fibrinogen may be converted into fibrin which is gradually replaced by fibrous tissue. Vascular and fibrotic changes in mouse lung were investigated after X irradiation of the right hemithorax. Blood volume and accumulation of extravascular proteins were measured using indium (111In)-labeled red cells, iodinated (131I) albumin, and iodinated (125I) fibrinogen. Tracers were injected 1-47 weeks after irradiation and lungs were excised 24 or 96 hr later to determine radioactivity. The amount of collagen was estimated by measuring the hydroxyproline content. During the first few months after X rays, lung blood volume decreased to a plateau which depended on radiation dose (10-25 Gy). Small increases in extravascular albumin and fibrinogen occurred at 1-12 weeks after 10-25 Gy. Subsequently, protein returned to normal after 10 Gy, remained elevated after 15 Gy, and increased after 20 and 25 Gy. Hydroxyproline per gram of dry irradiated lung was increased at 18 weeks after 15-25 Gy. Subsequently it showed little change although both total hydroxyproline content and dry weight decreased after 20 and 25 Gy. Support for the hypothesis was that hydroxyproline per gram only increased after X-ray doses which caused marked extravasation of protein. There was no evidence, however, for deposition of 125I-fibrin or for a gradual increase in fibrosis corresponding to the prolonged excess of extravascular protein.

journal_name

Radiat Res

journal_title

Radiation research

authors

Law MP

subject

Has Abstract

pub_date

1985-07-01 00:00:00

pages

60-76

issue

1

eissn

0033-7587

issn

1938-5404

journal_volume

103

pub_type

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