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J Biol Chem, Vol. 275, Issue 20, 14853-14859, May 19, 2000
From the 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
Recombinant Laminin-8
(
4
1
1)
PRODUCTION, PURIFICATION, AND INTERACTIONS WITH INTEGRINS*
,
¶
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
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
1/
1 chains to
form laminin-8 and with the
2/
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
6
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
6
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.
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