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Conservation in sequence and affinity of human and rodent PDGF ligands and receptors.

Authors: Herren, B  Weyer, KA  Rouge, M  Lotscher, P  Pech, M 
Citation: Herren B, etal., Biochim Biophys Acta 1993 Jun 25;1173(3):294-302.
Pubmed: (View Article at PubMed) PMID:8318539

Platelet-derived growth factor (PDGF) consists of two chains, PDGF-A and -B, which activate as homo- or heterodimers two receptors, alpha and beta. To test PDGF function in vivo we have generated neutralizing monoclonal antibodies. When analyzed with rat PDGFs only antibodies raised against human PDGF-AA showed cross-species activity. This correlated with complete amino acid sequence conservation of PDGF-A whereas rat PDGF-B differed in six positions when cloned rat PDGF cDNAs were compared with their human homologs within the receptor binding region. Extracellular domains of cloned rat PDGF alpha- and beta-receptor cDNAs did not reflect this difference in cross-species ligand conservation. When rat extracellular domains were expressed as soluble proteins they bound human PDGF-BB with high affinity after immobilization of the purified proteins on solid phase. Dissociation constants were identical to those of their human homologs. Thus, high affinity binding of human PDGF-BB to extracellular domains does not depend on species origin but only on receptor type.

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CRRD Object Information
CRRD ID: 633648
Created: 2003-08-29
Species: All species
Last Modified: 2004-05-25
Status: ACTIVE



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