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. 1984 Jul;3(7):1463–1468. doi: 10.1002/j.1460-2075.1984.tb01997.x

The heparin-binding domain of laminin is responsible for its effects on neurite outgrowth and neuronal survival.

D Edgar, R Timpl, H Thoenen
PMCID: PMC557545  PMID: 6745238

Abstract

The survival of cultured chick sympathetic neurons and the outgrowth of neurites were stimulated by the basement membrane protein laminin coated onto polyornithine culture substrates. The survival-potentiating activity was dependent on the presence of nerve growth factor. Both effects of laminin could be completely inhibited by affinity-purified antibodies against laminin fragment 3, the product of a limited proteolysis that corresponds to the heparin-binding globular domain at the end of the long arm of the laminin molecule. Antibodies against other laminin fragments were inactive, including those against previously determined cell-binding domains. A large laminin fragment, E8, was produced by brief elastase digestion and shown to consist of fragment 3 and an adjacent rod-like structure. Although lacking the cell binding domains, fragment E8 potentiated both neuronal survival and neurite outgrowth, and these effects could be blocked by antibodies against fragment 3. Weak survival and neurite potentiating activity was also detected in another fragment corresponding to the short arms of laminin, but as these effects were not inhibited by any of the antibodies tested they probably arose de novo during proteolysis. The heparin-binding domain of laminin is therefore responsible for its effects on neurons.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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