Biochemical Journal 1982-Dec
A cysteine proteinase secreted from human breast tumours is immunologically related to cathepsin B.
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The stable cathepsin B-like cysteine (thiol) proteinase secreted from human breast tumours in culture was shown to be destabilized by mercurial compounds. After such treatment the enzyme cross-reacts in a radioimmunoassay with a monospecific antiserum to human liver cathepsin B. It is suggested that the secreted enzyme may be a precursor form of lysosomal cathepsin B.