Abstract
Enterocyte-like differentiated HT-29 colon carcinoma cells were shown to contain far higher intracellular levels of activity of lysosomal cathepsins B, D, and L than their undifferentiated counterparts. In the latter, inhibition of lysosomal functions by leupeptin or ammonium chloride led to a marked increase in the cell-associated activity of the three cathepsins. High levels of pro-cathepsins B, D, and L were found in the culture media of both HT-29 cell populations. Ammonium chloride and chloroquine, which are known to impair the mannose-6-phosphate-dependent trafficking of lysosomal-targeted proteins, did not increase the secretion of the three cathepsins in either undifferentiated or differentiated cultures of HT-29 cells. Analyses by cell fractionation revealed heterogeneities with regard to the density and the content of lysosomal cathepsins between the two cell populations. Leupeptin induced the accumulation of mature lysosomal cathepsins B and L in light density organelles in undifferentiated HT-29 cells. Altogether, these data demonstrate that (1) the expression and subcellular distribution of cathepsins B, D, and L in HT-29 cells are influenced by their state of enterocytic differentiation, (2) the segregation of lys...Continue Reading
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