Details

Autor(en) / Beteiligte

• Batista, Dalia L
• Zhang, Xun
• Gejman, Roger
• Ansell, Peter J
• Zhou, Yunli
• Johnson, Sarah A
• Swearingen, Brooke
• Hedley-Whyte, E. Tessa
• Stratakis, Constantine A
• Klibanski, Anne

Titel

The Effects of SOM230 on Cell Proliferation and Adrenocorticotropin Secretion in Human Corticotroph Pituitary Adenomas

Ist Teil von

• The journal of clinical endocrinology and metabolism, 2006-11, Vol.91 (11), p.4482-4488

Ort / Verlag

Bethesda, MD: Endocrine Society

Erscheinungsjahr

2006

Link zum Volltext

Quelle

Oxford Journals 2020 Medicine

Beschreibungen/Notizen

• Context: There is no tumor-directed medical therapy available for Cushing’s disease. Objective: The objective was to determine the in vitro effect of the somatostatin analog pasireotide (SOM230) on cell proliferation in human corticotroph tumors. Design/Methods: Expression of somatostatin receptors (SSTR 1–5) was determined by quantitative RT-PCR in 13 human corticotroph tumors and by immunohistochemistry (IHC) in 12 of the 13 tumors. SOM230 effects on cell proliferation and ACTH release were evaluated in vitro using primary cultures of six of the 13 human corticotroph adenomas. Results: In our series, we found expression of SSTR subtypes 1, 2, 4, and 5 in human corticotroph tumors by quantitative RT-PCR. All receptor subtypes were detected by IHC, with SSTR subtype 5 having the highest IHC score in 83% (10 of 12) of the cases. Significant suppression of cell proliferation was observed in all tumors cultured (percent suppression range: 10–70%; P = 0.045–0.001). SOM230 inhibited ACTH secretion in five of the six tumors cultured (percent suppression range: 23–56%; P = 0.042–0.001). Conclusion: Corticotroph tumors express multiple SSTR subtypes. SOM230 significantly suppressed cell proliferation and ACTH secretion in primary cultures of human corticotroph tumors. These in vitro results support the hypothesis that SOM230 may have a role in the medical therapy of corticotroph tumors.