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Recombinant PDGF enhances megakaryocytopoiesis in vitro

1995; Wiley; Volume: 91; Issue: 2 Linguagem: Inglês

10.1111/j.1365-2141.1995.tb05291.x

1365-2141

Mo Yang, Colin N. Chesterman, Beng H. Chong,

Antiplatelet Therapy and Cardiovascular Diseases

The effect of recombinant platelet-derived growth factor (PDGF) on both murine and human megakaryocyte colony formation was studied in the plasma clot culture system. PDGF significantly stimulates megakaryocyte colony formation in a dose-dependent manner. The minimum concentration which had a significant stimulating effect on colony forming unit megakaryocyte (CFU-MK) was 10 ng/ml and maximum stimulation occurred at 50 ng/ml. The effect of PDGF was compared with that of interleukin (IL)-3, IL-6, granulocyte-macrophage colony stimulating factor (GM-CSF), erythropoietin (EPO) and acid fibroblast growth factor (aFGF) on megakaryocyte colony formation. The results showed that megakaryocyte colony stimulating activity of PDGF was slightly higher than those of GM-CSF and aFGF, but lower than those of IL-3, IL-6 and EPO. The effect of PDGF in combination with IL-3 or IL-6 on megakaryocyte colony formation was also investigated. No synergistic action was found between PDGF and IL-3 or IL-6, but an additive effect was observed with IL-3 plus IL-6. We also studied the effects of PDGF in combination with anti-IL6, anti-IL-3 or anti-GM-CSF antibody. The increase of megakaryocyte colony formation induced by PDGF was partially inhibited by anti-IL-6 or anti-GM-CSF antibody but not by anti-IL-3 antibody. These results indicate that PDGF is a positive regulator for megakaryocytopoiesis in vitro and IL-6 and GM-CSF may play a role in the mechanism whereby PDGF stimulates megakaryocytopoiesis.