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J Biol Chem, Vol. 275, Issue 20, 14853-14859, May 19, 2000

Recombinant Laminin-8 (alpha 4beta 1gamma 1)
PRODUCTION, PURIFICATION, AND INTERACTIONS WITH INTEGRINS*

Jarkko KortesmaaDagger , Peter Yurchenco§, and Karl TryggvasonDagger

From the Dagger  Division of Matrix Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177 Stockholm, Sweden and the § Department of Pathology, Robert Wood Johnson Medical School, Piscataway, New Jersey 08854

Laminins are a large family of heterotrimeric extracellular matrix glycoproteins that, in addition to having structural roles, take part in the regulation of processes such as cell migration, differentiation, and proliferation. The laminin alpha 4 chain is widely distributed both in adults and during development in tissues such as cardiac, skeletal and smooth muscle fibers, vascular endothelia, lungs, and in peripheral nerves. It can associate with laminin beta 1/gamma 1 chains to form laminin-8 and with the beta 2/gamma 1 chains to form laminin-9. Functional studies on these laminins have been hampered by poor availability of the protein in pure and soluble forms. To facilitate studies on laminin-8, recombinant laminin-8 was produced in a mammalian expression system, purified and shown to form native Y-shaped molecules in rotary shadowing electron microscopy. Integrins mediating cell adhesion to laminin-8 were identified using function-blocking mAbs. The integrin specificities were found to differ somewhat from that of laminin-1. Integrin alpha 6beta 1 was found to be a major mediator of adhesion of HT-1080 and cultured capillary endothelial cells to laminin-8. Considering the expression patterns of laminin-8 and integrin alpha 6beta 1 it is likely that the former is a ligand for the latter in vivo as well.


* This work was supported by grants from Biostratum Inc., the Novo Nordisc Foundation, the Swedish Medical Research Council, and Hedlund's Foundation.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Div. of Matrix Biology, Dept. Medical Biochemistry and Biophysics, Karolinska Institute, S-17177 Stockholm, Sweden. Tel.: 46-8-728-7720; Fax: 46-8-316-165; E-mail: Karl.Tryggvason@mbb.ki.se.


Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.
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