PMID: 9635249Jun 23, 1998Paper

Differential expression of arginase and iNOS in the lung in sepsis

Experimental Lung Research
M S CarrawayY C Huang

Abstract

The primary metabolic fates of L-arginine are conversion to L-citrulline by nitric oxide synthase (NOS) and to L-ornithine by arginase. In the lung, arginine utilization is increased after the inducible form of NOS (iNOS) is expressed during inflammation. The expression of arginase in normal lung and after sepsis, and its potential relationships with iNOS, however, are not known. Since arginase and iNOS share the substrate L-arginine, we tested the hypothesis that lung arginase would be co-induced with iNOS in sepsis and its cellular distribution would be related to that of iNOS in the lung. Lungs from cecal ligation and puncture (CLP) and sham-operated (S) rats were harvested 6 or 16 hours after the procedures. Lung wet-to-dry weight ratio, myeloperoxidase content, and lipid peroxidation products were measured as indices of lung injury. Western blot analyses were performed with polyclonal antibodies against two isoforms of rat arginase (I and II) and iNOS. Additional lungs from CLP and S animals were inflation-fixed for immunohistochemistry using the same antibodies. We found by Western blot that arginase II at 39 kDa was the main isoform present in normal rat lung. The enzyme was distributed diffusely in alveolar and bronchia...Continue Reading

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