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. 1990 Nov;9(11):3507–3513. doi: 10.1002/j.1460-2075.1990.tb07559.x

Mannose 6-phosphate receptor dependent secretion of lysosomal enzymes.

H H Chao 1, A Waheed 1, R Pohlmann 1, A Hille 1, K von Figura 1
PMCID: PMC552099  PMID: 2170115

Abstract

BHK and mouse L cells transfected with the cDNA for the human 46 kd mannose 6-phosphate receptor (MPR 46) secrete excessive amounts of newly synthesized mannose 6-phosphate containing polypeptides. The secretion is dependent on the amount, the recycling and the affinity for ligands of MPR 46. Incubation of transfected cells with antibodies blocking the binding site of MPR 46 reduces the secretion, and cotransfection with the cDNA for the human 300 kd mannose 6-phosphate (MPR 300) restores it to normal values. These results indicate that the two mannose 6-phosphate receptors compete for binding of newly synthesized ligands. In contrast to ligands bound to MPR 300, those bound to the MPR 46 are transported to and released at a site, e.g. early endosomes or plasma membrane, from where they can exit into the medium. Since antibodies blocking the binding site of MPR 46 reduce secretion also in non-transfected BHK and mouse L cells, at least part of the basal secretion of M6P-containing polypeptides is mediated by the endogenous MPR 46.

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Selected References

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