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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1975 Nov;72(11):4487–4491. doi: 10.1073/pnas.72.11.4487

Structure of tight junctions in epithelia with different permeability.

A Martínez-Palomo, D Erlij
PMCID: PMC388747  PMID: 812096

Abstract

Freeze-fracture studies have shown a network of intramembrane fibrils in the tight junctions of epithelia. A direct correlation between the number of fibrils and junctional permeability has been suggested by previous studies. However, we have made two groups of observations showing that junctional permeability is not univocally related to the complexity of the network revealed by freeze-fracture. (i) The tight junctions of the rabbit ileum mucosa are permeable to lanthanum, although they have a complex network of fibrils resembling the junctions of toad urinary bladder, which are impermeable to lanthanum. (ii) The tight junctions of the toad urinary bladder are normally of low permeability; however, when the luminal solution is made hypertonic with lysine, junctional permeability markedly increases and lanthanum permeates through the tight junctions. In freeze-fracture replicas, no differences between the fibrils of control and lysine-treated bladders were found. Our results indicate that junctional permeability is controlled not only by the complexity of the fibrilar network, but that some features of the junctions or the fibrils themselves, not yet revealed by electron microscopy, play a central role in regulating epithelial permeability.

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Selected References

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