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Journal of Clinical Endocrinology & Metabolism, Vol 47, 1390-1393, Copyright © 1978 by Endocrine Society

ARTICLES

Ectopic production of high molecular weight calcitonin and corticotropin by human small cell carcinoma cells in tissue culture: evidence for separate precursors

XY Bertagna, WE Nicholson, OS Pettengill, GD Sorenson, CD Mount and DN Orth

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.


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