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Collagen lysyl oxidase activity in the lung increases during bleomycin- induced lung fibrosis

DF Counts, JN Evans, TA Dipetrillo, KM Sterling and J Kelley

Intratracheal administration of bleomycin caused pulmonary fibrosis in rats. Bleomycin sulfate (640 micro grams/165 g b.wt. in 0.5 ml of sterile saline) was instilled Intratracheally into male Fisher 344 rats (169 +/- 5 g), whereas control animals received 0.5 ml of sterile saline by the same route. One, 3, 7, 14, 28 and 322 days after instillation, the animals were killed, the lungs were homogenized in 6 M urea, 0.01 M NaCl, 0.001 M potassium phosphate (pH 8.3) and the homogenates were subjected to ultracentrifugation. The 106,000 x g supernate was assayed for lysyl oxidase activity. Total lung hydroxyproline and desmosine content was determined at each time point. Lysyl oxidase specific activity in the lung was elevated significantly 3 days after bleomycin treatment, peaked 14 days after bleomycin treatment at 230% above the control value and was returned toward normal 28 days after treatment. The increase of lysyl oxidase activity preceded the maximal increase of total lung hydroxyproline and desmosine which occurred 28 days after bleomycin instillation.

Volume 219, Issue 3, pp. 675-678, 12/01/1981
Copyright © 1981 by American Society for Pharmacology and Experimental Therapeutics




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Copyright © 1981 by the American Society for Pharmacology and Experimental Therapeutics.