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. 1990 Aug 1;111(2):429–442. doi: 10.1083/jcb.111.2.429

Sorting of an internalized plasma membrane lipid between recycling and degradative pathways in normal and Niemann-Pick, type A fibroblasts

PMCID: PMC2116198  PMID: 2380243

Abstract

We examined the metabolism and intracellular transport of a fluorescent sphingomyelin analogue, N-(N-[6-[(7-nitrobenz-2-oxa-1,3-diazol-4- yl)amino]caproyl])- sphingosylphosphorylcholine (C6-NBD-SM), in both normal and Niemann-Pick, type A (NP-A) human skin fibroblast monolayers. C6-NBD-SM was integrated into the plasma membrane bilayer by transfer of C6-NBD-SM monomers from liposomes to cells at 7 degrees C. The cells were washed, and within 3 min of warming to 37 degrees C, both normal and NP-A fibroblasts had internalized C6-NBD-SM from the plasma membrane, resulting in a punctate pattern of intracellular fluorescence. Rates for C6-NBD-SM internalization and transport from intracellular compartments to the plasma membrane (recycling) were similar for normal and NP-A cells. With increasing time at 37 degrees C, internalized C6-NBD-SM accumulated in the lysosomes of NP-A fibroblasts, while normal fibroblasts showed increasing Golgi apparatus fluorescence with no observable lysosomal labeling. Since NP-A fibroblasts lack lysosomal (acid) sphingomyelinase (A-SMase), this result suggested that hydrolysis of C6-NBD-SM prevented its accumulation in the lysosomes of normal fibroblasts during its transport along the degradative pathway. We used the amount of C6-NBD- SM hydrolysis by A-SMase in normal cells as a measure of C6-NBD-SM transported from the cell surface to the lysosomes. After a lag period, C6-NBD-SM was delivered to the lysosomes at a rate of approximately 8%/h. This rate was approximately 18-19 fold slower than the rate of C6- NBD-SM recycling from intracellular compartments to the plasma membrane. Thus, small amounts of C6-NBD-SM were transported along the degradative pathway, while most endocytosed C6-NBD-SM was sorted for transport along the plasma membrane recycling pathway.

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Selected References

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