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. 1995 Apr;6(4):419–431. doi: 10.1091/mbc.6.4.419

Beta 8 integrins mediate interactions of chick sensory neurons with laminin-1, collagen IV, and fibronectin.

K Venstrom 1, L Reichardt 1
PMCID: PMC301201  PMID: 7542940

Abstract

Integrins are major receptors used by cells to interact with extracellular matrices. In this paper, we identify the first ligands for the beta 8 family of integrins, presenting evidence that integrin heterodimers containing the beta 8 subunit mediate interactions of chick sensory neurons with laminin-1, collagen IV, and fibronectin. A polyclonal antibody, anti-beta 8-Ex, was prepared to a bacterial fusion protein expressing an extracellular portion of the chicken beta 8 subunit. In nonreducing conditions, this antibody immunoprecipitated from surface-labeled embryonic dorsal root ganglia neurons a M(r) 100 k protein, the expected M(r) of the beta 8 subunit, and putative alpha subunit(s) of M(r) 120 k. Affinity-purified anti-beta 8-Ex strongly inhibited sensory neurite outgrowth on laminin-1, collagen IV, and fibronectin-coated substrata. Binding sites were identified in a heat-resistant domain in laminin-1 and in the carboxyl terminal, 40-kDa fibronectin fragment. On substrates coated with the carboxyl terminal fragment of fibronectin, antibodies to beta 1 and beta 8 were only partially effective alone, but were completely effective in combination, at inhibiting neurite outgrowth. Results thus indicate that the integrin beta 8 subunit in association with one or more alpha subunits forms an important set of extracellular matrix receptors on sensory neurons.

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Selected References

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