The Journal of Cell Biology, Vol 130, 797-805, Copyright © 1995 by The Rockefeller University Press

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Wortmannin causes mistargeting of procathepsin D. evidence for the involvement of a phosphatidylinositol 3-kinase in vesicular transport to lysosomes

HW Davidson
Department of Clinical Biochemistry, University of Cambridge, Addenbrookes Hospital, England.

At present little is known of the biochemical machinery controlling transport of newly synthesized lysosomal hydrolases from the trans- Golgi network (TGN) to endosomes. The demonstration that Vps34p (a protein required for targeting soluble hydrolases to the vacuole in Saccharomyces cerevisiae) is a phosphatidylinositol 3-kinase (PI3-K) suggested the possibility that a homologous enzyme might be involved in the equivalent step in mammalian cells. Using the PI3-K inhibitors wortmannin and LY294002, I provide evidence to support this hypothesis. Treatment of K-562 cells with wortmannin induced secretion of procathepsin D, with half-maximal inhibition of accurate targeting to lysosomes at 10-20 nM. Kinetic analysis indicated that a late Golgi (TGN) step was affected, and that other constitutive vesicular transport events were not. The M6P recognition signal was still generated in the presence of wortmannin suggesting that the drug was directly inhibiting export of the receptor-ligand complex from the TGN, while removal of the drug led to a rapid restoration of accurate sorting. At the concentrations used, wortmannin and LY294002 are presently accepted to be specific inhibitors of PI3-K. I conclude that these data implicate such an enzyme in the trafficking of M6P-receptor- ligand complexes from the TGN towards lysosomes.
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