title: Hormonal and metabolic regulation of human chondrosarcoma in vitro.
abstract: Prostaglandin A1 has a profound inhibitory effect on uridine incorporation into RNA of normal cartilage whereas N6-monobutyryladenosine 3',5'-cyclic monophosphate is either stimulatory or without an effect. Sera from intact and growth hormone-treated hypophysectomized rats stimulate RNA synthesis but serum from untreated hypophysectomized rats does not. The present study investigated the in vitro regulation of [3H]uridine incorporation into RNA of six human chondrosarcomas to determine if malignant human chondrocytes are under similar metabolic and hormonal regulation. Prostaglandin A1 (25 micrograms/ml) markedly inhibited uridine incorporation in all six tumors (56 to 80%). N6-Monobutyryladenosine 3',5'-cyclic monophosphate (1 mM) inhibited uridine incorporation in five tumors (20 to 50%). Uridine incorporation was stimulated by growth hormone-dependent serum factors in one tumor and by growth hormone-independent serum factors in two tumors. Two tumors were more responsive to serum from growth hormone-treated hypophysectomized rats than to serum from intact rats, and one tumor was unresponsive to serum stimulation. The data indicate that: (a) prostaglandin A1 is a very potent inhibitor of RNA synthesis in human chondrosarcomas; (b) N6-monobutyryladenosine 3',5'-cyclic monophosphate affects human chondrosarcomas differently than it does normal cartilage; and (c) responses of human chondrosarcomas to serum growth factors vary among individual tumors.
mesh_terms: D003994:Bucladesine / Q000031:analogs & derivatives / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002813:Chondrosarcoma / Q000503:physiopathology*; D003470:Culture Media; D013006:Growth Hormone / Q000494:pharmacology; D006801:Humans; D009924:Organ Culture Techniques; D011454:Prostaglandins A / Q000494:pharmacology; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D003470:Culture Media; D011454:Prostaglandins A; C002373:monobutyryl cyclic AMP; D003994:Bucladesine; D013006:Growth Hormone; C100573:prostaglandin A1