PMID- 23638994 OWN - NLM STAT- MEDLINE DCOM- 20140630 LR - 20211021 IS - 1557-9077 (Electronic) IS - 1050-7256 (Print) IS - 1050-7256 (Linking) VI - 23 IP - 11 DP - 2013 Nov TI - Low-normal free thyroxine confers decreased serum bilirubin in type 2 diabetes mellitus. PG - 1367-73 LID - 10.1089/thy.2013.0156 [doi] AB - BACKGROUND: Bilirubin may confer cardiovascular protection because of its strong antioxidative properties. Both thyroid dysfunction and the diabetic state affect bilirubin metabolism. Here we tested whether low-normal thyroid function affects serum bilirubin among euthyroid subjects with and without type 2 diabetes mellitus (T2DM). METHODS: Serum total bilirubin, thyrotropin and free thyroxine (free T4), transaminases, insulin sensitivity (homeostasis model assessment), and lipids were measured in 74 T2DM and 82 nondiabetic subjects with thyrotropin and free T4 levels within the euthyroid range. RESULTS: Bilirubin was positively related to free T4 in T2DM subjects (r = 0.370, p < 0.001), but not in nondiabetic subjects (r = 0.047, p = 0.68). In age- and sex-adjusted multiple linear regression analysis, free T4 was found to interact positively with the presence of T2DM on serum bilirubin (interaction term: beta = 0.251, p = 0.024). This interaction remained present after additional adjustment for alcohol intake, aspartate aminotransferase and insulin sensitivity (interaction term: beta = 0.222, p = 0.043), or alternatively for cholesterol and triglycerides (interaction term: beta = 0.203, p = 0.057). CONCLUSIONS: Lower free T4 levels within the euthyroid range confer decreased bilirubin in T2DM. Low-normal thyroid function could enhance atherosclerosis susceptibility in T2DM by decreasing serum bilirubin. FAU - Deetman, Petronella E AU - Deetman PE AD - Department of Internal Medicine, University of Groningen and University Medical Center Groningen , Groningen, The Netherlands . FAU - Kwakernaak, Arjan J AU - Kwakernaak AJ FAU - Bakker, Stephan J L AU - Bakker SJ FAU - Dullaart, Robin P F AU - Dullaart RP LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20130904 PL - United States TA - Thyroid JT - Thyroid : official journal of the American Thyroid Association JID - 9104317 RN - 0 (Antioxidants) RN - 0 (Insulin) RN - 0 (Triglycerides) RN - 9002-71-5 (Thyrotropin) RN - 97C5T2UQ7J (Cholesterol) RN - EC 2.6.1.1 (Aspartate Aminotransferases) RN - Q51BO43MG4 (Thyroxine) RN - RFM9X3LJ49 (Bilirubin) SB - IM MH - Aged MH - Antioxidants/metabolism MH - Aspartate Aminotransferases/metabolism MH - Atherosclerosis/metabolism MH - Bilirubin/*blood MH - Cholesterol/blood MH - Diabetes Mellitus, Type 2/*blood MH - Female MH - Homeostasis MH - Humans MH - Insulin/blood MH - Insulin Resistance MH - Linear Models MH - Male MH - Middle Aged MH - Oxidative Stress MH - Regression Analysis MH - Thyroid Function Tests MH - Thyroid Gland/metabolism/*physiology MH - Thyrotropin/blood MH - Thyroxine/*blood MH - Triglycerides/blood PMC - PMC3822386 EDAT- 2013/05/04 06:00 MHDA- 2014/07/01 06:00 PMCR- 2014/11/01 CRDT- 2013/05/04 06:00 PHST- 2013/05/04 06:00 [entrez] PHST- 2013/05/04 06:00 [pubmed] PHST- 2014/07/01 06:00 [medline] PHST- 2014/11/01 00:00 [pmc-release] AID - 10.1089/thy.2013.0156 [pii] AID - 10.1089/thy.2013.0156 [doi] PST - ppublish SO - Thyroid. 2013 Nov;23(11):1367-73. doi: 10.1089/thy.2013.0156. Epub 2013 Sep 4.