Regulation of chemotaxis by the platelet-derived growth factor receptor-beta.

V Kundra, J A Escobedo, A Kazlauskas, H K Kim, S G Rhee, L T Williams, B R Zetter

Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115.

Nature 1994 Feb 3

filter terms:

Chemotaxis is an important component of wound healing, development, immunity and metastasis, yet the signalling pathways that mediate chemotaxis are poorly understood. Platelet-derived growth factor (PDGF) acts both as a mitogen and a chemoattractant. Upon stimulation, the tyrosine kinase PDGF receptor-beta (PDGFR-beta) autophosphorylates and forms a complex that includes SII2(Src homology 2)-domain-containing proteins such as the phosphatidylinositol-specific phospholipase C-gamma, Ras-GTPase-activating protein (GAP), and phosphatidylinositol-3-OH kinase. Specific tyrosine-to-phenylalanine substitutions in the PDGFR-beta can prevent binding of one SH2-domain-containing protein without affecting binding of other receptor-associated proteins. Here we use phospholipase C-gamma and PDGFR-beta mutants to map specific tyrosines involved in both positive and negative regulation of chemotaxis towards the PDGF-BB homodimer. Our results indicate that a delicate balance of migration-promoting (phospholipase C-gamma and phosphatidylinositol-3-OH kinase) and migration-suppressing (GAP) activities are recruited by the PDGFR-beta to drive chemotaxis towards PDGF-BB.

Citation

V Kundra, J A Escobedo, A Kazlauskas, H K Kim, S G Rhee, L T Williams, B R Zetter. Regulation of chemotaxis by the platelet-derived growth factor receptor-beta. Nature. 1994 Feb 3;367(6462):474-6