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Increase in transglutaminase and its extracellular products in response to an inflammatory stimulus by lipopolysaccharide

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Abstract

Transglutaminase (TGase) activities were measured in rat tissues 1-7 days after intraperitoneal injection of saline or lipopolysaccharide (LPS) and in the cells and media from pre-confluent human fibroblasts cultured for two days in the presence or absence of LPS. ε(γ-glutamyl)lysine and [3H]putrescine-labelled γ-glutamyl derivatives in extracellular and cellular fibroblast proteins were also measured. Three effects of LPS were observed. Firstly, total TGase activity is greater in the tissues from the LPS-injected animals, with the maximum increase occurring at 1 day in dermis, epidermis and liver, at 5 days in the aorta and, after a decrease at 2-5 days, at 7 days in the panniculus muscle. Secondly, the fraction of the total activity which is buffer-extractable is greater on days 1 and/or 2 in all the tissues from the LPS-injected rats. Thirdly, in cultures of human fibroblasts, LPS increases that fraction of bound [3H]putrescine and of TGase and its γ-glutamylamine products which occurs in the extracellular medium. In addition, a higher concentration of TGase-derived crosslinks was found in extracellular as opposed to intracellular proteins. In conjunction with previous findings in skin wound healing and in atherosclerosis these results support the concept of an extracellular function for tissue TGase and indicate that there is a widespread association of increases in TGase and its extracellular products with inflammation and the healing or fibrotic processes which follow it.

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  1. Department of Biochemistry and Molecular Biology, University of Manitoba, Winnipeg, MB, R3E OW3, Canada

    J. Michael Bowness & Alan H. Tarr

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  1. J. Michael Bowness
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  2. Alan H. Tarr
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Bowness, J.M., Tarr, A.H. Increase in transglutaminase and its extracellular products in response to an inflammatory stimulus by lipopolysaccharide. Mol Cell Biochem 169, 157–163 (1997). https://doi.org/10.1023/A:1006846400478

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