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- W87083071 abstract "The proform of cathepsin D is secreted by some human breast-cancer cell lines upon stimulation with oestrogen. In these cell lines, procathepsin D was described to act as an autocrine mitogen, and a correlation between the cathepsin D concentration in tumour tissues and poor prognosis for the patient was demonstrated in several independent investigations. In the present study, we focused on the mechanism of procathepsin D mitogenic activity. Procathepsin D isolated from secretions of ZR-75-1 breast-cancer cell line was used to test for mitogenic activity on a set of seven human cell lines. For nanomolar procathepsin D concentrations, we found a stronger dose-responsive cellular reaction in the case of several different human breast-cancer-derived cell lines. The mitogenic activity was not blocked by the inhibition of proteolytic activity nor by the inhibition of the interaction of procathepsin D with mannose-6-phosphate receptors. On the other hand, the addition of antibodies raised against the propeptide impaired the mitogenic activity of procathepsin D, and a synthetic peptide alone corresponding to the propeptide of procathepsin D produced similar effects, as did the zymogen molecule. The synthetic propeptide was shown to block partially the interaction of procathepsin D with the cellular surface. Our results indicate that the mitogenic function involves the propeptide of cathepsin D, which appears to be recognized by a surface receptor." @default.
- W87083071 created "2016-06-24" @default.
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- W87083071 date "1994-11-01" @default.
- W87083071 modified "2023-10-02" @default.
- W87083071 title "Mitogenic function of human procathepsin D: the role of the propeptide" @default.
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- W87083071 doi "https://doi.org/10.1042/bj3030775" @default.
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