Sphingolipid transport from the trans-Golgi network to the apical surface in permeabilized MDCK cells - PubMed (original) (raw)
Sphingolipid transport from the trans-Golgi network to the apical surface in permeabilized MDCK cells
T Kobayashi et al. FEBS Lett. 1992.
Free article
Abstract
We have measured the transport of de novo synthesized fluorescent analogs of sphingomyelin and glucosylceramide from the trans-Golgi network (TGN) to the apical membrane in basolaterally permeabilized Madin-Darby canine kidney (MDCK) cells. Sphingolipid transport was temperature, ATP and cytosol dependent. Introduction of bovine serum albumin (BSA), which binds fluorescent sphingolipid monomer, into the permeabilized cells, did not affect lipid transport to the apical membrane. Both fluorescent sphingomyelin and glucosylceramide analogs were localized to the lumenal bilayer leaflet of isolated TGN-derived vesicles. These results strongly suggest that both sphingolipids are transported from the TGN to the apical membrane via vesicular traffic.
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