Vindeløv SD, Hartoft-Nielsen ML, Rasmussen ÅK, Bendtzen K, Kosteljanetz M, Andersson AM, Feldt-Rasmussen U. Interleukin-8 production from human somatotroph adenoma cells is stimulated by interleukin-1β and inhibited by growth hormone releasing hormone and somatostatin.
Growth Horm IGF Res 2011;
21:134-139. [PMID:
21658592 DOI:
10.1016/j.ghir.2011.03.005]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 03/18/2011] [Accepted: 03/20/2011] [Indexed: 01/22/2023]
Abstract
OBJECTIVE
Pituitary adenomas cause morbidity and mortality due to their localization and influence on pituitary hormone secretion. Although the pathogenesis of pituitary adenomas is unclear, studies have indicated that cytokines are involved. We investigated the role of cytokines, in particular interleukin (IL)-8, in the pathogenesis of growth hormone (GH) producing tumours.
DESIGN
Human somatotroph adenoma tissue was obtained from patients undergoing surgery for acromegaly. The tissue underwent mechanical and enzymatic digestion, was washed, suspended and cultured in 24-chamber plates. After stimulation/inhibition supernatants were harvested. As control of growth hormone producing properties of the cultured cells, GH releasing hormone (GHRH) stimulated and somatostatin inhibited the GH response.
RESULTS
The cultured adenoma cells released both IL-6 and IL-8 and the secretion was inhibited by GHRH and somatostatin. IL-1β dose-dependently stimulated GH, IL-6 and IL-8 secretion.
CONCLUSION
Using cultured primary somatotroph adenoma cells as a dynamic method, we found a consistent release not only of IL-6 as described previously, but also of IL-8. This finding could be important for reassessing a role of these cytokines in the pathogenesis of pituitary tumour growth and function, and thus form a basis for targeted therapy. In line with previous studies, our results further indicated a common physiological or pathophysiological reaction of endocrine cells to cytokine stimulation.
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