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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization of lipotropin-, corticotropin-, and beta-endorphin-immunoreactive materials secreted in vitro by a human pituitary adenoma responsible for a case of Nelson's syndrome.

A human pituitary adenoma responsible for a case of Nelson's syndrome was maintained in organ culture and the incubation medium was examined with four different RIAs; human corticotropin (ACTH), beta-MSH, lipotropin ( LPH), and beta-endorphin (beta-End). All four immunoreactivites (IRs) were present in the medium obtained after 24 h of incubation. Gel exclusion chromatography under denaturing conditions (6 m guanidine HCl) revealed several immunoreactive components. Two components having both human beta-MSH (beta-hMSH) and human LPH ( hLPH) IR coeluted with beta- hLPH and gamma- hLPH; a component with beta-hMSH IR but no hLPH IR coeluted with [125I]beta-hMSH; a component with human ACTH (hACTH) IR eluted at the position of hACTH. Sephadex G-50 gel exclusion chromatography revealed that approximately 80% and 20% of human beta-End (beta-hEnd) IR were accounted for by components coeluting with beta- hLPH and beta-hEnd, respectively. These data demonstrate the presence in this incubation medium of materials similar to if not identical with beta- hLPH, gamma- hLPH, hACTH, beta-hMSH, and beta-hEnd; they suggest that all of these peptides may be secreted in the circulation of patients with Nelson's syndrome.[1]


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