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EMBO J. 1991 Sep;10(9):2375-85.

Characterization of the integrin alpha 8 subunit: a new integrin beta 1-associated subunit, which is prominently expressed on axons and on cells in contact with basal laminae in chick embryos.

Author information

1
Department of Physiology, University of California San Francisco, 94143.

Abstract

In this article, we describe the primary structure, the biochemical characterization and the tissue distribution of a novel integrin alpha subunit, named alpha 8. This subunit associates with the integrin beta 1 subunit to form alpha 8 beta 1 heterodimers. By sequence analysis, alpha 8 is more closely related to the alpha 5 and alpha v subunits than to other characterized integrin alpha subunits, but is clearly distinct from each of these. The alpha 8 subunit is expressed at moderate levels in several epithelial cells where its localization adjacent to basal laminae suggests that alpha 8-containing heterodimers interact with at least one extracellular matrix constituent. In embryos, the highest levels of alpha 8 protein expression are seen in the nervous system where alpha 8 is strongly expressed by several classes of projection neurons. The alpha 8 subunit is concentrated in axon tracts, including major projections in the spinal cord, optic system and auditory system. This tissue specific expression and cellular localization suggest that alpha 8-containing integrin receptors might promote axon outgrowth in the embryonic nervous system.

PMID:
1714374
PMCID:
PMC452932
[Indexed for MEDLINE]
Free PMC Article

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