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. 1964 Sep 1;22(3):565–586. doi: 10.1083/jcb.22.3.565

STUDIES ON AN EPITHELIAL (GLAND) CELL JUNCTION

I. Modifications of Surface Membrane Permeability

Werner R Loewenstein 1, Yoshinobu Kanno 1
PMCID: PMC2106478  PMID: 14206423

Abstract

Membrane permeability of an epithelial cell junction (Drosophila salivary gland) was examined with intracellular microelectrodes and with fluorescent tracers. In contrast to the non-junctional cell membrane surface, which has a low permeability to ions (10-4 mho/cm2), the junctional membrane surface is highly permeable. In fact, it introduces no substantial restriction to ion flow beyond that in the cytoplasm; the resistance through a chain of cells (150 Ω cm) is only slightly greater than in extruded cytoplasm (100 Ω cm). The diffusion resistance along the intercellular space to the exterior, on the other hand, is very high. Here, there exists an ion barrier of, at least, 104Ω cm2. As a result, small ions and fluorescein move rather freely from one cell to the next, but do not leak appreciably through the intercellular space to the exterior. The organ here, rather than the single cell, appears to be the unit of ion environment. The possible underlying structural aspects are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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