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Cathepsin B secretion by rabbit articular chondrocytes: modulation by cycloheximide and glycosaminoglycans

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Summary

Rabbit articular chondrocytes in monolayer culture are modulated away from their differentiated state and undergo morphological and biochemical changes. One of the characteristics of the modulated state is an abnormally high production of the cysteine endopeptidase cathepsin B. Addition to chondrocyte cultures of the protein biosynthesis inhibitor, cycloheximide, resulted in a concentration-dependent reduction of cathepsin B secretion, which was fully restored after removal of cycloheximide. Glycosaminoglycans added to the culture medium of modulated chondrocytes partially reduced the rate of secretion of cathepsin B, this effect being dependent on their structure, the degree of sulfation, and concentration. The age of the chondrocytes and the duration of the treatment also influenced this response. The switching off of cathepsin B release was apparently best favored by a high concentration of negatively charged sulfate groups attached to a polymeric glycosaminoglycan chain; this simulates the natural environment of the chondrocytes in articular cartilage.

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Authors and Affiliations

  1. Department of Rheumatology, University Hospital, CH-8091, Zürich, Switzerland

    Antonio Baici & Angela Lang

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  1. Antonio Baici
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  2. Angela Lang
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Dedicated to Univ.-Dozent Dr. Karl Chlud on the occasion of his 60th birthday

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Baici, A., Lang, A. Cathepsin B secretion by rabbit articular chondrocytes: modulation by cycloheximide and glycosaminoglycans. Cell Tissue Res. 259, 567–573 (1990). https://doi.org/10.1007/BF01740785

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