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de Farias CR, Cardoso BR, de Oliveira GMB, de Mello Guazzelli IC, Catarino RM, Chammas MC, Cozzolino SMF, Knobel M. A randomized-controlled, double-blind study of the impact of selenium supplementation on thyroid autoimmunity and inflammation with focus on the GPx1 genotypes. J Endocrinol Invest 2015; 38:1065-74. [PMID: 25894865 DOI: 10.1007/s40618-015-0285-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 04/01/2015] [Indexed: 10/23/2022]
Abstract
PURPOSE To analyze the impact of selenium supplementation on serum antiTPO levels and thyroid echogenicity in patients with CAT, evaluating the response in subgroups with different GPx1 genotypes. METHODS CAT patients (n = 55) with positive antiTPO were randomized to selenomethionine (SeMet) 200 μg daily (n = 28) or placebo (n = 27) for 3 months. Assessments included GPx1 genotyping at baseline and serum levels of plasma selenium, erythrocyte GPx1 activity, antiTPO and thyroid echogenicity at baseline, and 3 and 6 months. RESULTS In the SeMet group, the increase in plasma levels of selenium and erythrocyte GPx1 activity was similar among patients with different GPx1 genotypes. In the overall cohort, patients randomized to SeMet showed a 5 % decrease in antiTPO levels at 3 months (p = non-significant) and 20 % at 6 months (p < 0.001 versus 3 months). In contrast, patients in the placebo group did not show significant changes in antiTPO levels at any time point. Subgroup analysis showed that patients with different GPx1 genotypes presented comparable responses in antiTPO levels and echogenicity index to SeMet. CONCLUSIONS Selenium supplementation decreased serum antiTPO levels in CAT patients, with similar response among patients with different GPx1 genotypes.
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Affiliation(s)
- C R de Farias
- Thyroid Unit and Laboratory of Cellular and Molecular Biology (LIM-25), Division of Endocrinology and Metabolism, University of São Paulo Medical School, Hospital das Clínicas, Av. Dr. Enéas de Carvalho Aguiar, 155, 8th floor, bl 3, PAMB, São Paulo, SP, 05403-900, Brazil.
| | - B R Cardoso
- Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Science, University of São Paulo, Av. Prof. Lineu Prestes 580, bl 14, Cidade Universitária, São Paulo, SP, 05508-000, Brazil.
| | - G M B de Oliveira
- Ultrasound Unit, Department of Radiology, University of São Paulo Medical School, Hospital das Clínicas, Av Dr Enéas de Carvalho Aguiar, 255, 3rd floor, Unit 013, São Paulo, SP, 05403-900, Brazil.
| | - I C de Mello Guazzelli
- Laboratory of Cellular and Molecular Endocrinology, LIM-25, Division of Endocrinology and Metabolism, University of São Paulo Medical School, Av. Dr. Arnaldo 455, 4th floor, Units 4305/4307, São Paulo, SP, 01246-903, Brazil.
| | - R M Catarino
- Hematology and Biochemistry, Center of Pathology, Adolpho Lutz Institute, Av. Dr. Arnaldo 351, 7th floor, São Paulo, SP, 01246-000, Brazil.
| | - M C Chammas
- Ultrasound Unit, Department of Radiology, University of São Paulo Medical School, Hospital das Clínicas, Av. Dr. Enéas de Carvalho Aguiar, 255, 3rd floor, Unit 013, São Paulo, SP, 05403-010, Brazil.
| | - S M F Cozzolino
- Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Science, University of São Paulo, Av. Prof. Lineu Prestes 580, bl 14, Cidade Universitária, São Paulo, SP, 05508-000, Brazil.
| | - M Knobel
- Thyroid Unit and Laboratory of Cellular and Molecular Biology (LIM-25), Division of Endocrinology and Metabolism, University of São Paulo Medical School, Hospital das Clínicas, Av. Dr. Enéas de Carvalho Aguiar, 155, 8th floor, bl 3, PAMB, São Paulo, SP, 05403-900, Brazil.
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