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Cell Biochemistry and Biophysics

, Volume 3, Issue 3, pp 251–277 | Cite as

Analysis of coated pit recycling on human fibroblasts

  • Byron Goldstein
  • Carla Wofsy
Article

Abstract

The recycling to the cell surface of previously internalized coated pits has been proposed as a likely mechanism for the rapid regeneration of coated pits on human fibroblast surfaces at 37°C (1). We present a general mathematical model of coated pit recycling for the case when the coat cycles as a single unit, and use it to analyze certain time and temperature dependent data obtained by Anderson et al. (1) and Vermeer et al. (2). We show how recycling can account for these data and how this type of data can be used to distinguish between different possible recycling mechanisms. We show that these data are inconsistent with a two compartment model where coat material simply shuttles back and forth between coated pits and short-lived coated vesicles. From these data we estimate for human fibroblasts at 37°C: that the time for a coated pit to be replenished through recycling after it is lost through internalization is greater than 3.5 min; and that at any moment 53% or less of the cell’s clathrin that is involved in coated pit recycling is on the cell surface.

Index Entries

Low density lipoproteins coated pits, on human fibroblasts human fibroblasts, coated pit recycling in fibroblasts, coated pit recycling in pits, coated, on human fibroblasts recycling, of coated pits in fibroblasts 

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Copyright information

© The Humana Press Inc 1981

Authors and Affiliations

  • Byron Goldstein
    • 1
  • Carla Wofsy
    • 2
  1. 1.Theoretical DivisionUniversity of California, Los Alamos Scientific LaboratoryLos Alamos
  2. 2.Department of Mathematics and StatisticsUniversity of New MexicoAlbuquerque

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