Lipid sorting in epithelial cells
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Overview
Review reveals mechanisms governing lipid sorting in polarized epithelial cells, suggesting intracellular sorting machinery maintains distinct apical and basolateral membrane compositions.
Key Points
- To examine the biochemical and cell biological mechanisms by which polarized epithelial cells sort lipids to establish and maintain structurally distinct plasma membrane domains.
- Reviewed biochemical and physiological evidence on the asymmetric distribution of lipids across apical and basolateral cell surfaces.
- Evaluated intracellular trafficking routes, trans-Golgi network sorting mechanisms, and the barrier function of tight junctions in restricting lipid mixing.
- Epithelial cells establish distinct surface compositions by enriching glycosphingolipids in the apical membrane relative to the basolateral domain.
- Sorting occurs intracellularly prior to surface delivery, where specialized vesicular machinery routes specific lipid classes toward designated membrane destinations.
- Tight junctions act as lateral diffusion barriers within the outer membrane leaflet, preventing homogenization of partitioned lipid pools.
Cite This Study
Simons et al. (1988) studied this question.