Human breast milk contains procathepsin D - Detection by specific antibodies

V. Vetvicka, J. Vagner, M. Baudys, J. Tang, S. I. Foundling, M. Fusek

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Abstract

The presence of the zymogen of cathepsin D in human milk was detected using antibodies specific for the proenzyme and by the proteolytic activity at low pH. The antibodies were raised against a synthetic propetide of human cathepsin D and were tested using immunoprecipitations and western blots of samples from different breast cancer cell lines as well as cytosol fractions of human breast cancer tissues. In all experiments these antibodies recognized specifically procathepsin D. Procathepsin D from human milk was partially activated at low pH. The activity was monitored using hemoglobin 14C proteolytic assay, and it was abolished by pepstatin A - a specific inhibitor of aspartic proteinases. Western blots did not reveal presence of cathepsin B or cathepsin H. These data indicate specific secretion of cathepsin D in human breast milk.

Original languageEnglish (US)
Pages (from-to)921-928
Number of pages8
JournalBiochemistry and Molecular Biology International
Volume30
Issue number5
StatePublished - Sep 14 1993
Externally publishedYes

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Genetics

Cite this

Vetvicka, V., Vagner, J., Baudys, M., Tang, J., Foundling, S. I., & Fusek, M. (1993). Human breast milk contains procathepsin D - Detection by specific antibodies. Biochemistry and Molecular Biology International, 30(5), 921-928.