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- Title
Differential effects of natural flavonoids on growth and iodide content in a human Na/I symporter-transfected follicular thyroid carcinoma cell line.
- Authors
Janny P Schroder-van der Elst; Daan van der Heide; Johannes A Romijn; Jan W A Smit
- Abstract
OBJECTIVE: Natural flavonoids (plant pigments) have been shown to inhibit thyroid peroxidase (TPO) in vitro and the growth of thyroid cancer cell lines. We have studied the role of flavonoids on the iodide transport and the growth of the human follicular thyroid cancer cell line (FTC133) which was stably transfected with the human Na+/I- symporter (hNIS). DESIGN AND METHODS: Cells were treated with flavonoids (0.550 μM) for 0, 2, 4 and 6 days; 125I content and 125I efflux of the cells and DNA content were measured. RESULTS: Cell growth was inhibited significantly at day 6 by most flavonoids. Eight out of ten flavonoids decreased the 125I content of the cells at day 4. Morin did not influence the 125I content of the cells and, surprisingly, myricetin increased the 125I content of the cells. Kaempferol, apigenin, luteolin and F21388 decreased NIS mRNA expression after 15, 29 and 48 h; after 96 h NIS mRNA returned to normal. CONCLUSION: As TPO is not present in this cell line, the effects of the flavonoids on the iodide uptake are not related to organification. Myricetin was the only flavonoid studied that increased the influx and decreased the efflux of iodide. The effect of myricetin (decreased growth and increased retention of iodide) can be of therapeutic value in the radioiodide treatment of thyroid carcinoma.
- Subjects
FLAVONOIDS; IODIDE peroxidase; PLANT pigments; CANCER cells
- Publication
European Journal of Endocrinology, 2004, Vol 150, Issue 4, p0557
- ISSN
0804-4643
- Publication type
Article