Endocrinol Metab > Volume 24(2); 2009 > Article
Journal of Korean Endocrine Society 2009;24(2):93-99.
DOI: https://doi.org/10.3803/jkes.2009.24.2.93    Published online June 1, 2009.
Search for Materials that Influence Human Medullary Thyroid Carcinoma Cell Proliferation.
Hyun Won Shin, Hye Won Jang, Keun Sook Kim, Ji In Lee, Ji Young Park, Sun Wook Kim, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Kwang Won Kim, Jae Hoon Chung
1Division of Endocrinology and Metabolism, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
2Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
Surgical excision is the only effective treatment of medullary thyroid carcinoma (MTC) and there is no certain treatment for recurrence or distant metastasis. Materials that influence MTC cell proliferation were recently reported. Presently, we evaluated the influence of dexamethasone, somatostatin, progesterone, estradiol-17-beta, forskolin and gastrin on MTC cell proliferation and calcitonin secretion. METHODS: Genomic DNA was extracted and sequenced from untreated thyroid TT cells and cells treated with 10-5~10-10 M dexamethasone, somatostatin, progesterone, estradiol-17-beta, forskolin or gastrin, and cultured for 1~6 days. Cell proliferation was assessed using a BrdU assay at days 1, 2, 3, and 6. Calcitonin in the culture medium from dexamethasone-treated TT cells was measured at days 1~3. RESULTS: Replacement of cysteine with tryptophan at codon 634 of exon 11 was evident in treated TT cells. There was no significant difference in cell proliferation at days 1~3 in cells treated with somatostatin, progesterone, estradiol-17-beta, gastrin and forskolin, while proliferation was inhibited in dexamethasone-treated cells in a concentration-dependent manner from 10-5~10-8 M with no inhibition evident at 10-10 M. Calcitonin levels in 10-5~10-8 M dexamethasone-treated cells were decreased. CONCLUSION: Dexamethasone is a potentially useful compound to suppress MTC cell proliferation. Further studies are necessary to explore this potential further prior to clinical use.
Key Words: calcitonin, dexamethasone, estradiol-17-beta, forskolin, gastrin, medullary thyroid carcinoma, progesterone, somatostatin

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