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Fluorescence demonstration of a cathepsin H-like protease in cardiac, skeletal and vascular smooth muscles

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Summary

A cathepsin H-like enzyme was localized by histochemical techniques in cardiac muscle, extensor digitorum longus and soleus skeletal muscles, and vascular smooth muscle. Using the specific exopeptidase activity of this enzyme against the substrate arg-4-methoxy-β-naphthylamide, valid histochemical assay conditions were developed. More fluorescent granules were observed in cardiac muscle than in the soleus and about equal amounts in vascular smooth muscle and the extensor digitorum longus. The reaction rate was enhanced by chloride ions and inhibited by 1mm p-chloromercuribenzoate. The maximal activity was observed between pH 5.5 and 6.0. Chemical fixation with periodate-lysine-paraformaldehyde preserved a small amount of enzymatic activity.

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Authors and Affiliations

  1. Department of Physiology, West Virginia University Medical Center, 26506, Morgantown, West Virginta, USA

    William T. Stauber & Shu-Hui Ong

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  1. William T. Stauber
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  2. Shu-Hui Ong
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Stauber, W.T., Ong, SH. Fluorescence demonstration of a cathepsin H-like protease in cardiac, skeletal and vascular smooth muscles. Histochem J 14, 585–591 (1982). https://doi.org/10.1007/BF01011891

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  • DOI: https://doi.org/10.1007/BF01011891

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