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Somatostatin receptor subtype 1-selective activation reduces cell growth and calcitonin secretion in a human

Maria C Zatelli1, Federico Tagliati, Daniela Piccin

  • 1Section of Endocrinology, Department of Biomedical Sciences and Advanced Therapies, University of Ferrara, Via Savonarola 9, I-44100 Ferrara, Italy.

Biochemical and Biophysical Research Communications
|October 3, 2002
PubMed

Insights

New somatostatin analogs targeting sst(1) show promise for treating medullary thyroid carcinoma (MTC). These selective agonists significantly reduce MTC cell proliferation and calcitonin secretion, suggesting a potential new therapy for this aggressive cancer.

Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Medullary thyroid carcinoma (MTC) is a rare, aggressive endocrine tumor with limited effective therapies.
  • Somatostatin (SST) receptor signaling is implicated in MTC, but the roles of specific subtypes are not fully elucidated.
  • Previous studies show variable effects of SST and its analogs on MTC cell behavior.

Purpose of the Study:

  • To investigate the therapeutic potential of novel sst(1)-selective somatostatin analogs (BIM-23926 and BIM-23745) in a human MTC cell line (TT).
  • To evaluate the impact of sst(1) agonists on MTC cell proliferation, viability, and calcitonin (CT) production.
  • To explore the downstream molecular mechanisms, including CREB phosphorylation, affected by sst(1) activation.

Main Methods:

  • Utilized the human MTC TT cell line, which expresses all somatostatin receptor subtypes.
  • Administered sst(1)-selective agonists BIM-23926 and BIM-23745 at various concentrations.
  • Assessed DNA synthesis, viable cell number, calcitonin secretion, and gene expression.
  • Measured CREB phosphorylation levels following agonist treatment.

Main Results:

  • Both BIM-23926 and BIM-23745 significantly reduced DNA synthesis and viable cell number in TT cells.
  • Treatment with sst(1)-selective agonists markedly decreased calcitonin secretion and gene expression.
  • A reduction in CREB phosphorylation was observed upon treatment with sst(1)-selective agonists.

Conclusions:

  • Potent sst(1)-selective somatostatin analogs demonstrate significant anti-proliferative and anti-secretory effects on MTC cells in vitro.
  • These findings suggest that targeting the sst(1) receptor subtype could represent a promising therapeutic strategy for medullary thyroid carcinoma.
  • Further investigation into sst(1) agonists is warranted for the clinical management of MTC.

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