Resumen
Three recombinant homodimeric isoforms of platelet-derived growth factor (PDGF) were produced and purified in milligram quantities by expression of PDGF A-and B-chains in yeast cells. Structural analysis of the purified short and long variants of PDGF-AA (PDGF-AAS and PDGF-AAL) and PDGF-BB showed that they had been properly processed and assembled into dimers. PDGF-AAs and PDGF-AAL were found to bind only to the PDGF A-type receptor on human fibroblasts, with affinities of 0.1 and 0.2 uM, respectively. PDGF-BB bound to cells with A-and B-type receptors and to cells with B-type receptor only with affinities of 0.6 nM in both cases. Each fibroblast appeared to express about 4-5 times more B-type receptors than A-type receptors. The maximal mitogenic response to PDGF-BB of human fibroblasts was almost 2-fold higher than that induced by either of the two PDGF-AA forms. The three isoforms of PDGF also stimulated growth in soft agar of human fibroblasts with PDGF-BB inducing a higher maximal response.
Idioma original | Inglés |
---|---|
Páginas (desde-hasta) | 271-281 |
Número de páginas | 11 |
Publicación | Growth Factors |
Volumen | 1 |
N.º | 3 |
DOI | |
Estado | Publicada - 1989 |
Áreas temáticas de ASJC Scopus
- Endocrinología
- Bioquímica clínica
- Biología celular