Expression of PDGF beta-receptors in human meningioma cells.
Meningioma is a generally benign tumor derived from arachnoid tissue. We have investigated the presence of functionally active PDGF-receptors on human meningioma cells in culture. Tumor samples were obtained from 3 surgically removed benign meningiomas and normal arachnoid tissue from an autopsy case. Binding studies were performed by using 125I-labelled recombinant PDGF-AA and PDGF-BB. Only 125I-PDGF-BB showed specific binding to all tumor-cell cultures after incubation of cells for 2 hr at 4 degrees C. Effects of PDGF-AA and PDGF-BB on DNA synthesis were measured as 3H-thymidine incorporation during 48 hr of labelling cells maintained in Eagle's minimum essential medium 0.5% fetal calf serum. PDGF-BB but not PDGF-AA stimulated DNA synthesis in all 3 tumor-cell cultures. Total cellular RNA was analyzed by Northern blotting and hybridization with a 32P-labelled human PDGF beta-receptor probe, and PDGF beta-receptor mRNA was found in both tumor and arachnoid cell cultures. Furthermore, PDGF beta-receptor mRNA was shown to be present in 2 meningioma biopsies and immunohistochemical staining revealed that PDGF beta-receptors are present in meningioma and arachnoid tissues in vivo. It appears that a possible way of maintaining human meningioma cell growth in vivo is through activation of PDGF beta-receptors.
Department of Pathology, University Hospital, Uppsala, Sweden.
J L
JL
Wang
M
M
Nistér
M
M
Hermansson
B
B
Westermark
J
J
Pontén
D000328:Adult; D000368:Aged; D001099:Arachnoid / Q000166:cytology / Q000378:metabolism; D015152:Blotting, Northern; D002478:Cells, Cultured; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007457:Iodine Radioisotopes; D008297:Male; D008579:Meningioma / Q000473:pathology / Q000648:ultrastructure*; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D011956:Receptors, Cell Surface / Q000145:classification / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D017479:Receptors, Platelet-Derived Growth Factor; D013194:Staining and Labeling; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014407:Tumor Cells, Cultured
D007457:Iodine Radioisotopes; D010982:Platelet-Derived Growth Factor; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; D014316:Tritium; D017479:Receptors, Platelet-Derived Growth Factor; D013936:Thymidine