| Abstract: | Cathepsin D, the major lysosomal aspartic proteinase, is responsible for the autolysis of cartilage at slightly acidic pH, and it has been suspected of making a significant contribution to the breakdown of the living tissue, such as is stimulated by retinol. Our finding, however, has been that neither inhibitory antibodies against cathepsin D, nor chemical inhibition with pepstatin, significantly decreases the rate of degradation of proteoglycan in the organ culture system. Most of the other proteinase inhibitors tested were similarly ineffective, although EDTA and 1,10-phenanthroline inhibited the resorption by a cytotoxic effect. We conclude that although cartilage matrix degradation has clear characteristics of a proteolytic process, the identity of the enzyme(s) responsible remains obscure. |
