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An Animal Model of Pulmonary Radiation Fibrosis with Biochemical, Physiologic, Immunologic, and Morphologic Observations

R. L. Karvonen, F. Fernandez-Madrid, R. L. Maughan, K. C. Palmer and I. Fernandez-Madrid
Radiation Research
Vol. 111, No. 1 (Jul., 1987), pp. 68-80
DOI: 10.2307/3577022
Stable URL: http://www.jstor.org/stable/3577022
Page Count: 13
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An Animal Model of Pulmonary Radiation Fibrosis with Biochemical, Physiologic, Immunologic, and Morphologic Observations
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Abstract

An animal model of pulmonary radiation fibrosis was established, using male CBA/j mice. Both lungs of each mouse in one group (DL) were irradiated with two doses of 8.5 Gy each, separated by 30 days. A control group (CG) was sham-irradiated. There was a small but significant difference (P < 0.03) in average breathing rate between DL and CG 27 weeks after the second irradiation which increased until the 34th week followed by a plateau. The accumulated hydroxyproline content of the irradiated mouse lung was 40% greater (P < 0.02) than that of the sham-irradiated lung at 42 weeks and thereafter. Anticollagen antibodies assayed 52 weeks after irradiation by enzyme-linked immunosorbant assay were elevated by 49% in sera from the irradiated mice compared to sera from sham-irradiated mice. Mortality during the 52-week period following the second irradiation was low (13%) for both groups. Histological comparison of irradiated and control mouse lungs fixed under uniform inflation pressure indicated no significant differences. The model has unique features including an increase in collagen deposition, no acute changes attributable to radiation, a small but statistically significant abnormality in pulmonary function, an immunologic response to collagen, and low mortality.

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