Skip to main content
Aller à la page d’accueil de la Commission européenne (s’ouvre dans une nouvelle fenêtre)
français français
CORDIS - Résultats de la recherche de l’UE
CORDIS
Contenu archivé le 2024-04-19

Protein engineering of therapeutic antibodies and peptide antagonists of scatter factor, a novel protein involved in cancer growth and spreading

Objectif

To produce antibodies that interfere with the binding of scatter factor to its receptor MET and mutant forms of the growth factor and receptor with therapeutic potential.
We have produced: (i) antibodies that inhibit the binding of scatter factor to the MET receptor, (ii) scatter factor mutants lacking heparin-binding but retaining full biological activity, (iii) MET receptor mutants with altered ability to transduce the signal and (iv) transgenic mice lacking a functional scatter factor gene.
MAJOR SCIENTIFIC BREAKTHROUGHS: AND/OR INDUSTRIAL APPLICATIONS:
Scatter factor is the first member of a new family of growth factors that share the domain organisation and mechanism of activation of the blood proteinase plasminogen. The factor is produced by fibroblast and other mesenchymal cells and acts on epithelia and endothelia through a tyrosine kinase receptor encoded by the protooncogene c-MET. The aim of this project was the engineering of antibodies and growth factor/receptor mutants which could find applications in therapy. The main achievements of the project are summarised below.
Blocking antibodies. Phage-derived antibodies have been produced that modulate the activity of scattter factor on target cells. These are human antibodies derived from large phage libraries which bind the growth factor with affinity in the nanomolar range. The affinity of these antibodies can now be improved further using protein engineering techniques such as successive rounds of mutagenesis and phage-selection.
Scatter factor mutants. We have constructed three-dimensional models of teh six individual domains of scatter factor and generated a number of mutants of several of these domains. Several mutants in which clusters of basic amino acids present in the hairpin loop of the N-terminal domain have been replaced with negatively charged residues appeared to be of considerable interest. These amino acid substitutions reduced the heparin-binding activity of scatter factor but not its ability to bind the MET receptor and transduce the growth factor signal. These mutants could find potential applications in therapy.
MET receptor mutants. A number of mutants of the tyrosine kinase domain of the MET receptor were generated which allowed the precise mapping of the tyrosine residues involved in signal transduction. Two tyrosines (Y1349 and Y1356) appeared critical for binding to SH2-containing molecules involved in intracellular signalling (such as PI 3-kinase, phospho-lipase-C-gamma, pp60c-src and the GRB-2/SoS complex). Other tyrosines, however, were found to be involved in the MET signal transduction pathway: mutations of the C-terminal tyrosines Y1311, Y1347, Y1354 and Y1363 reduced or abolished scatter factor-induced cell movement and morphogenesis whereas mutation of the justamembrane tyrosine Y1001 generated a constitutively activated form of c-MET.
Scatter factor knock-out mice. Transgenic lines carrying mutations in the scatter factor or MET genes were generated and were embryonic lethal. The scatter factor and MET mutations affected the development of the liver (hepatocytes), placenta (trophoblast) and limb bud (limb muscle). Thus scatter factor and its receptor are essential for the development of several epithelial lineages and a subset of skeletal muscles. These transgenic lines will prove valuable for assessing the activity of scatter factor mutants and analogues in vivo through their ability to rescue the lethal phenotype of the scatter factor mutant mice.
Conclusions. The network project aimed at the derivation of antibodies, scatter factor mutants and MET receptor mutants that could enable the development of therapeutic peptides and proteins. The project has achieved these goals and has yielded valuable results for the determination of the three-dimensional structure of scatter factor and MET domains. These results are of significant interest in the light of the increasing realisation that scatter factor and MET may constitute main targets for cancer therapy and should assist the development of such therapies.
NUMBER OF PUBLICATIONS:Total: 43Joint: 04

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: Le vocabulaire scientifique européen.

Vous devez vous identifier ou vous inscrire pour utiliser cette fonction

Programme(s)

Programmes de financement pluriannuels qui définissent les priorités de l’UE en matière de recherche et d’innovation.

Thème(s)

Les appels à propositions sont divisés en thèmes. Un thème définit un sujet ou un domaine spécifique dans le cadre duquel les candidats peuvent soumettre des propositions. La description d’un thème comprend sa portée spécifique et l’impact attendu du projet financé.

Appel à propositions

Procédure par laquelle les candidats sont invités à soumettre des propositions de projet en vue de bénéficier d’un financement de l’UE.

Données non disponibles

Régime de financement

Régime de financement (ou «type d’action») à l’intérieur d’un programme présentant des caractéristiques communes. Le régime de financement précise le champ d’application de ce qui est financé, le taux de remboursement, les critères d’évaluation spécifiques pour bénéficier du financement et les formes simplifiées de couverture des coûts, telles que les montants forfaitaires.

CSC - Cost-sharing contracts

Coordinateur

Imperial Cancer Research Fund (ICRF)
Contribution de l’UE
Aucune donnée
Adresse
Hills Road
CB2 2QQ Cambridge
Royaume-Uni

Voir sur la carte

Coût total

Les coûts totaux encourus par l’organisation concernée pour participer au projet, y compris les coûts directs et indirects. Ce montant est un sous-ensemble du budget global du projet.

Aucune donnée

Participants (3)

Mon livret 0 0