Cited by 293Cell Adhesion Molecules ResearchCellular Mechanics and InteractionsBarrier Structure and Function Studies

The role of integrins in the maintenance of endothelial monolayer integrity.

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Lampugnani, M G, Resnati, M, Dejana, E, Marchisio, P C·1991·The Journal of cell biology

Abstract

This paper shows that, in confluent human umbilical vein endothelial cell (EC) monolayers, the integrin heterodimers alpha 2 beta 1 and alpha 5 beta 1, but not other members of the beta 1 subfamily, are located at cell-cell contact borders and not at cellular free edges. Also the alpha v chain, but not its most common partner beta 3, that is widely expressed in EC cell-matrix junctions, is found at cell-cell borders. In EC monolayers, the putative ligands of alpha 2 beta 1 and alpha 5 beta 1 receptors, i.e., laminin, collagen type IV, and fibronectin, are also organized in strands corresponding to cell-cell borders. The location of the above integrin receptors is not an artifact of in vitro culture since it has been noted also in explanted islets of the native umbilical vein endothelium. The integrins alpha 2 beta 1 and alpha 5 beta 1 play a role in the maintenance of endothelial monolayer continuity in vitro. Indeed, specific antibodies to alpha 2 beta 1, alpha 5 beta 1, and the synthetic peptide GRGDSP alter its continuity without any initial cell detachment. Moreover, antibodies to alpha 5 beta 1 increase the permeation of macromolecules across confluent EC monolayers. In contrast beta 3 antibodies were ineffective. It is suggested that the relocation of integrins to cell-cell borders is a feature of cells programmed to form polarized monolayers since integrins have a different distribution in nonpolar confluent dermal fibroblasts. The conclusion is that some members of the integrin superfamily collaborate with other intercellular molecules to form lateral junctions and to control both the monolayer integrity and the permeability properties of the vascular endothelial lining. This also suggest that integrins are adhesion molecules provided with a unique biochemical adaptability to different biological functions.

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Crossref · 10.1083/jcb.112.3.479

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  • The scaffold function of inactive α5β1-integrin is independent of ECM binding.

    “This function for inactive α5β1-integrin conformation is independent of ECM binding, providing a unique example of integrin noncanonical signaling in EC-EC junctions and explaining the long-standing puzzle of how integrins inhabit cell-cell junctions irrespective of matrix ligand binding (28, 29).”

    From Inactive β1-integrin acts as a junctional scaffold for angiopoietin/TIE2/FOXO1 signaling (2026) · cites this paper as [29]

    The paper reports α5β1 at endothelial cell–cell borders and says this localization did not depend on the substrate on which the cells were initially grown (p. 482). It does not establish that α5β1 was inactive or had an ECM-binding-independent scaffold function: the discussion considers a possible role for matrix ligands, and the authors say their evidence is inconclusive (p. 487). (LLM, conf=0.85)

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Authors
Lampugnani, M. G., Resnati, M., Dejana, E., & Marchisio, P. C.
Affiliations
Mario Negri Institute for Pharmacological Research (IT)
Venue
The Journal of cell biology
Published
1991-02-01
Volume
112
Issue
3
Pages
479-490
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2033393629
Cited by
292
References
71
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 5 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 5 · 2018: 1 · 2017: 5 · 2016: 1 · 2015: 2 · 2014: 1 · 2013: 4 · 2012: 4
FWCI
8.05
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
Keywords
integrins, endothelial monolayer integrity, alpha2beta1 integrin, alpha5beta1 integrin, alpha3beta1 integrin, cell-cell contact, CD61, laminin, type IV collagen, fibronectin, endothelial permeability, GRGDSP peptide, endothelial cell adhesion, lateral junctions
MeSH terms
Actins, Amino Acid Sequence, Antigen-Antibody Complex, Cell Membrane Permeability, Cells, Cultured, Cytoskeletal Proteins, Endothelium, Vascular, Fluorescent Antibody Technique, Humans, Molecular Sequence Data, Oligopeptides, Umbilical Veins, Integrins, Vinculin, Macromolecular Substances

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