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Fibrillar and cytoskeletal substructure of tight junctions: Analysis of single-stranded tight junctions linking fibroblasts of the lamina fusca in hamster eyes

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Summary

The lamina fusca of the hamster eye contains layers of flattened, slightly overlapping fibroblasts. Thin sections of the overlapping margins reveal punctate, tight-junction-like membrane appositions associated with accumulation of cytoplasmic filaments, 5–7 nm in diameter. Intermediate filaments are present in the surrounding cytoplasm. A diffuse dense substance occurs in adjacent intercellular space. Freeze-fracture replicas show that the membrane appositions are mainly single-stranded tight junctions, each composed of two fibrils (micelles), and each continuous or nearly continuous around the fibroblastic perimeter. Fracturing characteristics of these junctions offer a unique opportunity to gain further insight into tight junctional morphology. When exposed, the fibrils adhere to the P-face, measure 9.2±0.3 nm in diameter, and are accompanied by a narrow band of membrane differing in texture from non-junctional membrane. Characteristically, the junctional fibrils themselves mark the deviation line along which fracture planes pass from one membrane of the junction to the other. This pattern exposes, over long distances, the P-face of one membrane on one side of this line and E-face of the adjacent membrane on the other. Analysis of any single junction over such distances reveals that the juxtaposition of the fibrils may gradually twist or undulate over a range of at least 180° within the two involved membranes. The fracture plane appears preferentially to pass between the two junctional fibrils; association of the cytoskeleton with junctional fibrils may govern this route of fracture. Cytoskeletal attachment appears to be to a single fibril and may alternate from one fibroblast to the next depending on which cytoplasmic leaflet is nearest a given fibril.

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Authors and Affiliations

  1. Department of Anatomy and Cell Biology, University of Southern California School of Medicine, Los Angeles, California, USA

    Gregory S. Hageman & Douglas E. Kelly

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  1. Gregory S. Hageman
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  2. Douglas E. Kelly
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Parts of this work have been presented at meetings of the Association for Research in Vision and Ophthalmology (Kelly and Hageman 1983) and the American Association of Anatomists (Hageman and Kelly 1984)

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Hageman, G.S., Kelly, D.E. Fibrillar and cytoskeletal substructure of tight junctions: Analysis of single-stranded tight junctions linking fibroblasts of the lamina fusca in hamster eyes. Cell Tissue Res. 238, 545–557 (1984). https://doi.org/10.1007/BF00219871

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