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Human sputum cathep...
Human sputum cathepsin B degrades proteoglycan, is inhibited by a2-macroglobulin and modulated by neutrophil elastase cleavage of cathepsin B precursor and cystatin C
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Buttle, David J (author)
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- Abrahamson, Magnus (author)
- Lund University,Lunds universitet,Avdelningen för klinisk kemi och farmakologi,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Clinical Chemistry and Pharmacology,Department of Laboratory Medicine,Faculty of Medicine
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Burnett, David (author)
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Mort, John S (author)
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Barrett, Alan J (author)
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Dando, Pamela M (author)
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Hill, Susan L (author)
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(creator_code:org_t)
- 1991
- 1991
- English.
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In: Biochemical Journal. - 0264-6021. ; 276, s. 325-331
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Abstract
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- The high-Mr alkali-stable form of cathepsin B was purified from purulent human sputum. It was shown to solubilize proteoglycan monomer entrapped in polyacrylamide at a rate comparable with that of human lysosomal cathepsin B. Like the enzyme from lysosomes, sputum cathepsin B was bound by human alpha 2-macroglobulin, which inhibited its action on proteoglycan. Cystatin C in purulent sputum was shown to be the N-terminally truncated form generated by neutrophil elastase cleavage, and sputum cathepsin B was only weakly inhibited by recombinant cystatin C that had been cleaved by neutrophil elastase in vitro. Addition of neutrophil elastase to mucoid sputum led to a 5-fold increase in cathepsin B activity concomitant with a lowering in Mr of the cysteine proteinase from 40,000 to 37,000, i.e. the size of the active enzyme purified from purulent sputum. It is concluded that the high-Mr form of cathepsin B present in purulent sputum is a functional proteinase, unlike similar forms of the enzyme secreted by mammary gland in organ culture. The activity of cathepsin B in sputum is modulated by neutrophil elastase, by a combination of inhibitor inactivation and zymogen activation.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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