title: Adenylate cyclase activity of v-ras-k transformed rat epithelial thyroid cells.
abstract: The regulation of adenylate cyclase has been analyzed in normal rat thyroid cells as well as in the same cells transformed by the v-ras-k oncogene. In both cell types the adenylate cyclase complex consists of the two GTP-binding proteins, Gi and Gs, as demonstrated by the specific ADP-ribosylation induced by pertussis and cholera toxin, respectively. The response of adenylate cyclase of the transformed cells to forskolin, pertussis toxin and cholera toxin is attenuated with respect to the control cell line. The thyrotropic hormone (TSH), that acts on normal thyroid cells in culture as a growth factor by stimulating the adenylate cyclase activity, is not able to induce DNA synthesis nor does it stimulate adenylate cyclase in v-ras-k transformed cells.
mesh_terms: D037361:Adenylate Cyclase Toxin; D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D002772:Cholera Toxin / Q000494:pharmacology; D005576:Colforsin / Q000494:pharmacology; D004247:DNA / Q000096:biosynthesis; D004848:Epithelium / Q000201:enzymology; D019204:GTP-Binding Proteins / Q000378:metabolism; D009857:Oncogenes; D037342:Pertussis Toxin; D051381:Rats; D013961:Thyroid Gland / Q000201:enzymology*; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
chemical_list: D037361:Adenylate Cyclase Toxin; D010566:Virulence Factors, Bordetella; D005576:Colforsin; D004247:DNA; D002772:Cholera Toxin; D037342:Pertussis Toxin; D019204:GTP-Binding Proteins; D000262:Adenylyl Cyclases