Identification of PDGF receptors on human megakaryocytes and megakaryocytic cell lines.
Platelet-derived growth factor (PDGF) is a potent chemotactic and mitogenic factor implicated to play important roles in a variety of normal and pathophysiologic settings. We investigated PDGF receptor expression on human megakaryocytes and several megakaryocytic cell lines (CHRF, DAMI, Meg-01, M-07e) using enzyme-linked immunosorbent assay (ELISA), flow cytometry and immunocytochemical staining. Both PDGF receptor subtypes were identified on CHRF, DAMI, and Meg-01 cells by ELISA; PDGF beta-receptor levels exceeded alpha-receptor levels. Flow cytometry revealed that beta-receptor levels on CHRF and DAMI cells exceeded those on Meg-01 cells, and that M-07e expressed neither receptor. Immunocytochemical staining confirmed these findings and determined that bone marrow megakaryocytes also expressed PDGF receptors. Exposure of megakaryocytes to PDGF-BB dramatically induced the expression of the immediate-early gene, c-fos, within 30 min. Moreover, PDGF-BB significantly stimulated CHRF proliferation and colony formation. The present study demonstrates the presence of functional PDGF receptors on human megakaryocytes and their ability to mediate a mitogenic response.
Yang
M
M
The Centre for Thrombosis and Vascular Research, School of Pathology, The University of New South Wales and Department of Haematology, The Prince of Wales Hospital, Sydney, Australia.
Khachigian
L M
LM
Hicks
C
C
Chesterman
C N
CN
Chong
B H
BH
D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006801:Humans; D008533:Megakaryocytes / Q000378:metabolism*; D017479:Receptors, Platelet-Derived Growth Factor / Q000096:biosynthesis*
D017479:Receptors, Platelet-Derived Growth Factor