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Vol. 9, Issue 4, 809-816, April 1998
Medical Research Council Laboratory for Molecular Cell Biology,
University College, London WC1E 6BQ, United Kingdom
We have previously shown that in HEp-2 cells, multivesicular bodies
(MVBs) processing internalized epidermal growth factor-epidermal growth factor receptor complexes mature and fuse directly with lysosomes in which the complexes are degraded. The MVBs do not fuse
with a prelysosomal compartment enriched in mannose 6-phosphate receptor (M6PR) as has been described in other cell types. Here we show
that the cation-independent M6PR does not become enriched in the
endocytic pathway en route to the lysosome, but if a pulse of M6PR or
an M6PR ligand, cathepsin D, is followed, a significant fraction of
these proteins are routed from the trans-Golgi to MVBs.
Accumulation of M6PR does not occur because when the ligand dissociates, the receptor rapidly leaves the MVB. At steady state, most
M6PR are distributed within the trans-Golgi and
trans-Golgi network and in vacuolar structures
distributed in the peripheral cytoplasm. We suggest that these
M6PR-rich vacuoles are on the return route from MVBs to the
trans-Golgi network and that a separate stable M6PR-rich
compartment equivalent to the late endosome/prelysosome stage does not
exist on the endosome-lysosome pathway in these cells.
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