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. 1985 Oct;121(1):166–175.

Collagenase, elastase, and nonspecific protease production by vigorous or immunomodulated liver granulomas and granuloma macrophages/eosinophils of S mansoni-infected mice.

J L Truden, D L Boros
PMCID: PMC1888036  PMID: 2996360

Abstract

Schistosomiasis mansoni is characterized by granulomatous inflammations, deposition of collagen, and irreversible liver fibrosis. In chronic infections fibrosis is cumulative, while collagen synthesis and degradation are diminished. In the present study, we compared collagenase, elastase, and nonspecific neutral protease (NP) activities in isolated vigorous (8-week infection) and immunomodulated (18-20-week infection) liver granulomas. Enzyme activity was localized in the adherent macrophage (greater than 90% purity) and nonadherent eosinophil-rich (greater than 70% purity) cell fractions of the disaggregated granulomas. Collagenase levels were approximately two times higher in granuloma extracts and explant culture supernates of the vigorous as compared with the immunoregulated lesions. However, macrophages and eosinophil-rich cells derived from either type of granuloma secreted similar enzyme levels. Elastase and NP levels in granuloma extracts and secretions of adherent macrophage and eosinophil-rich cell populations were the same in vigorous or immunomodulated lesions but were significantly greater in vigorous granuloma culture supernates. In addition to active collagenase, trypsin activatable latent collagenase was also present in both types of granuloma extracts, explants and eosinophil-rich cell culture supernates. Latent elastase was also detected in granuloma extracts or explant supernates but was absent from secretions of granuloma cells. These results suggest that the presence of active neutral proteases within granulomas may play an important role in the regulation of tissue repair and remodeling during the fibrotic process.

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Selected References

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