title: Ectopic production of high molecular weight calcitonin and corticotropin by human small cell carcinoma cells in tissue culture: evidence for separate precursors.
abstract: The DMS-79 continuous line of human small cell lung carcinoma cells, which produces immunoreactive (IR)-corticotropin (ACTH), -lipotropin (LPH), and -beta-endorphin (beta END), was found to produce IR-calcitonin (CT). Two major high molecular weight (HMW) forms of IR-CT were observed after gel exclusion chromatography under denaturing conditions (mol wt. approximately 7,000 and approximately 14,000), as well as a minor HMW IR-CT component (mol. wt. approximately 70,000). None of these IR-CT materials was extracted from DMS-79 medium by affinity chromatography using an ACTH antibody covalently bound to agarose. These results demonstrate ectopic production of HMW forms of CT and ACTH/LPH/beta END by human lung tumor cells in tissue culture, but do not support the existence of a common CT/ACTH/LPH/beta END precursor molecule.
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000096:biosynthesis*; D002116:Calcitonin / Q000096:biosynthesis*; D018288:Carcinoma, Small Cell / Q000378:metabolism*; D002460:Cell Line; D002850:Chromatography, Gel; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism*; D008970:Molecular Weight; D011498:Protein Precursors / Q000378:metabolism
chemical_list: D011498:Protein Precursors; D000324:Adrenocorticotropic Hormone; D002116:Calcitonin