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Journal Articles
The effect of wortmannin on the localisation of lysosomal type I integral membrane glycoproteins suggests a role for phosphoinositide 3-kinase activity in regulating membrane traffic late in the endocytic pathway
B.J. Reaves, N.A. Bright, B.M. Mullock, J.P. Luzio
Journal of Cell Science 1996 109: 749-762;
B.J. Reaves
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N.A. Bright
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B.M. Mullock
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J.P. Luzio
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Summary

Addition of wortmannin to normal rat kidney cells caused a redistribution of the lysosomal type I integral membrane proteins Igp110 and Igp120 to a swollen vacuolar compartment. This compartment did not contain the cation independent mannose 6-phosphate receptor and was depleted in acid hydrolases. It was distinct from another swollen vacuolar compartment containing the cation independent mannose 6-phosphate receptor. The swollen Igp110-positive compartment was accessible to a monoclonal antibody against Igp120 added extracellularly, showing that it had the characteristics of an endosomal compartment. Wortmannin had no gross morphological effect on the trans-Golgi network or lysosomes nor any effect on the delivery to the trans-Golgi network of endocytosed antibodies against the type I membrane protein TGN38. We propose that the observed effects of wortmannin were due to inhibition of membrane traffic between cation independent mannose 6-phosphate receptor-positive late endosomes and the trans-Golgi network and to inhibition of membrane traffic between a novel Igp120-positive, cation independent mannose 6-phosphate receptor-negative late endosomal compartment and lysosomes. The effects of wortmannin suggest a function for a phosphatidylinositol 3-kinase(s) in regulating membrane traffic in the late endocytic pathway.

  • © 1996 by Company of Biologists

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The effect of wortmannin on the localisation of lysosomal type I integral membrane glycoproteins suggests a role for phosphoinositide 3-kinase activity in regulating membrane traffic late in the endocytic pathway
B.J. Reaves, N.A. Bright, B.M. Mullock, J.P. Luzio
Journal of Cell Science 1996 109: 749-762;
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The effect of wortmannin on the localisation of lysosomal type I integral membrane glycoproteins suggests a role for phosphoinositide 3-kinase activity in regulating membrane traffic late in the endocytic pathway
B.J. Reaves, N.A. Bright, B.M. Mullock, J.P. Luzio
Journal of Cell Science 1996 109: 749-762;

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