Evidence for Differential Effects of Selective Somatostatin Receptor Subtype Agonists on α-Subunit and Chromogranin A Secretion and on Cell Viability in Human Nonfunctioning Pituitary Adenomas in Vitro

Somatostatin (SRIF) analogs interacting with SRIF receptor (SSTR) subtypes SSTR2 and SSTR5 reduce hormone secretion of pituitary adenomas, but their antiproliferative effects are still controversial. We investigated the in vitro effects of SRIF and SSTR-selective agonists interacting with SSTR1 (BIM...

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Published in:The journal of clinical endocrinology and metabolism 2004-10, Vol.89 (10), p.5181-5188
Main Authors: Zatelli, Maria Chiara, Piccin, Daniela, Bottoni, Arianna, Ambrosio, Maria Rosaria, Margutti, Angelo, Padovani, Roberto, Scanarini, Massimo, Taylor, John E, Culler, Michael D, Cavazzini, Luigi, degli Uberti, Ettore C
Format: Article
Language:English
Subjects:
Adenoma
Adult
Aged
Biological and medical sciences
Cell Survival - drug effects
Chromogranin A
Chromogranins - secretion
Endocrinopathies
Female
Fundamental and applied biological sciences. Psychology
Humans
Immunohistochemistry
In Vitro Techniques
Male
Medical sciences
Middle Aged
Pituitary Neoplasms
Receptors, Somatostatin - genetics
Receptors, Somatostatin - metabolism
RNA, Messenger - metabolism
Somatostatin - agonists
Somatostatin - pharmacology
Tumor Cells, Cultured
Vertebrates: endocrinology
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Summary:Somatostatin (SRIF) analogs interacting with SRIF receptor (SSTR) subtypes SSTR2 and SSTR5 reduce hormone secretion of pituitary adenomas, but their antiproliferative effects are still controversial. We investigated the in vitro effects of SRIF and SSTR-selective agonists interacting with SSTR1 (BIM-23926), SSTR2 (BIM-23120), SSTR5 (BIM-23206), or both SSTR2 and SSTR5 (BIM-23244) on α-subunit and chromogranin A secretion and on cell viability of 12 nonfunctioning pituitary adenomas (NFA) expressing SSTR1, SSTR2, and SSTR5, as assessed by RT-PCR. Treatment with SRIF or BIM-23206 did not modify α-subunit and chromogranin A secretion, which was significantly inhibited by BIM-23926, BIM-23120, and BIM-23244. SRIF and BIM-23120 did not influence cell viability, which was significantly promoted by BIM-23206 and BIM-23244 and reduced by treatment with BIM-23926. These results demonstrate that, in the selected NFA, the SSTR1-selective agonist inhibits secretory activity and cell viability, the SSTR2-selective agonist inhibits secretion but not cell viability, and the SSTR5-selective agonist does not influence secretion but promotes cell viability. These data can explain the lack of inhibitory effects of currently used SRIF analogs and suggest that drugs acting potently and preferentially on SSTR1 might be useful for medical treatment of NFA.
ISSN:0021-972X
1945-7197
DOI:10.1210/jc.2003-031954