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Two-compartment behavior during transport of folate compounds in L1210 cell plasma membrane vesicles

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Summary

The transport of [3H] 1,l 5-formyltetrahydrofolate, [3H] folic acid, and [3H]methotrexate by L1210 cell plasma membrane vesicles exhibited multicompartmental behavior. Two separate vesicular compartments (parallel relationship) of approximately equal volume were revealed during measurements of influx and efflux. Flux in one compartment was rapid, saturable, highly temperature-sensitive, and inhibited by pCMBS. Flux in the other compartment exhibited all of the characteristics of passive diffusion. These results imply that our plasma membrane vesicle preparations consist of a mixture of two functional species. Transport of folate into one of these species occurs by passive diffusion alone, whereas transport into the other kind of vesicle occurs by both passive diffusion and carrier-facilitated transport.

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Authors and Affiliations

  1. Memorial Sloan-Kettering Cancer Center, 10021, New York, New York

    C. -H. Yang & F. M. Sirotnak

  2. Los Alamos National Laboratory, 87545, Los Alamos, New Mexico

    M. Dembo

Authors
  1. C. -H. Yang
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  2. M. Dembo
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  3. F. M. Sirotnak
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Yang, C.H., Dembo, M. & Sirotnak, F.M. Two-compartment behavior during transport of folate compounds in L1210 cell plasma membrane vesicles. J. Membrain Biol. 68, 19–28 (1982). https://doi.org/10.1007/BF01872250

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  • DOI: https://doi.org/10.1007/BF01872250

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