PMID- 1525582 OWN - NLM STAT- MEDLINE DCOM- 19921016 LR - 20141120 IS - 1050-7256 (Print) IS - 1050-7256 (Linking) VI - 2 IP - 2 DP - 1992 Summer TI - Iodide induces transforming growth factor beta 1 (TGF-beta 1) mRNA in sheep thyroid cells. PG - 141-5 AB - We examined TGF-beta mRNA levels in primary sheep thyroid cell cultures to determine whether the inhibitory effects of iodide on thyroid cells could be explained by an induction of TGF-beta mRNA and if this induction was mediated by iodine organification. Thyroid cells were incubated with TSH and five additives (insulin, somatostatin, growth hormone, transferrin, and glycyl-L-histidyl-L-lysin) for 2-3 weeks and then were exposed to sodium iodide (NaI) or 1-methylimidazole-2-thiol (methimazole, MMI), or both for 72 h. Iodide at 10(-6) M and 10(-4) M significantly increased the amount of TGF-beta mRNA as determined by Northern blot analysis with a rat TGF-beta 1 cDNA probe. This increase in TGF-beta 1 mRNA was abolished by the addition of methimazole, an inhibitor of organification. These data indicate that the effects of iodide on thyroid growth and function may be mediated by a process that involves organification of iodide and increases in TGF-beta 1 mRNA levels. FAU - Yuasa, R AU - Yuasa R AD - Department of Medicine, University of California, San Diego. FAU - Eggo, M C AU - Eggo MC FAU - Meinkoth, J AU - Meinkoth J FAU - Dillmann, W H AU - Dillmann WH FAU - Burrow, G N AU - Burrow GN LA - eng PT - Journal Article PL - United States TA - Thyroid JT - Thyroid : official journal of the American Thyroid Association JID - 9104317 RN - 0 (RNA, Messenger) RN - 0 (Transforming Growth Factor beta) RN - 554Z48XN5E (Methimazole) RN - 9679TC07X4 (Iodine) RN - F5WR8N145C (Sodium Iodide) SB - IM MH - Analysis of Variance MH - Animals MH - Blotting, Northern MH - In Vitro Techniques MH - Iodine/*pharmacology MH - Methimazole/pharmacology MH - RNA, Messenger/*biosynthesis MH - Sheep MH - Sodium Iodide/pharmacology MH - Thyroid Gland/*drug effects/metabolism MH - Transforming Growth Factor beta/biosynthesis/*genetics EDAT- 1992/01/01 00:00 MHDA- 1992/01/01 00:01 CRDT- 1992/01/01 00:00 PHST- 1992/01/01 00:00 [pubmed] PHST- 1992/01/01 00:01 [medline] PHST- 1992/01/01 00:00 [entrez] AID - 10.1089/thy.1992.2.141 [doi] PST - ppublish SO - Thyroid. 1992 Summer;2(2):141-5. doi: 10.1089/thy.1992.2.141.