Milena Barcza Stockler-Pinto1, Juan Jesús Carrero2, Luciene De Carvalho Cardoso Weide3, Silvia Maria Franciscato Cozzolino4, Denise Mafra1. 1. Cardiovascular Sciences Graduate Program, Fluminense Federal University (UFF), Niterói-RJ, Brazil.. milbarcza@gmail.com. 2. Divisions of Renal Medicine and Baxter Novum, Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.. milbarcza@gmail.com. 3. Medicine Faculty, Pathology Department, Federal University Fluminense (UFF), Niterói-RJ, Brazil.. milbarcza@gmail.com. 4. University of São Paulo (USP), Faculty of Pharmaceutical Sciences, São Paulo, Brazil.. milbarcza@gmail.com.
Abstract
BACKGROUND: thyroid function depends on trace mineral selenium (Se), being at the active center of the iodothyronine deiodinase that catalyzes the conversion of the thyroxine (T4) to the active form of thyroid hormone, triiodothyronine (T3). Hemodialysis (HD) patients have reduced T3 levels partly due to impaired hormonal conversion that can be related to Se deficiency, a common feature in these patients. This study evaluated the effect of Brazil nuts (richest Se source) on thyroid hormone levels in HD patients. METHODS: we performed an uncontrolled intervention with 40 HD patients (53.3 ± 16.1 yrs, dialysis vintage 62.0 (8.0 - 207.0) months) that received one nut (≈5g, average 58.1 μg Se/g) per day for three months. Se plasma levels were determined by atomic absorption spectrophotometry with hydride generation and, serum T3, free T4 (FT4), TSH as well as glutathione peroxidase (GPx) activity were measured by ELISA. RESULTS: all patients were Se deficient and presented low T3 levels at baseline. After intervention, Se plasma levels (from 17.6 ± 11.6 to 153.4 ± 86.1 μg/L), GPx activity (from 33.7 ± 5.9 to 41.4 ± 11.2 nmol/min/mL), T3 (from 27.3 ± 8.8 to 50.2 ± 4.8ng/dL) and FT4 levels (0.87 ± 0.2 to 0.98 ± 0.4 ng/dL) were significantly increased (p < 0.05), while TSH levels were reduced (from 2.17 ± 1.3 to 1.96 ± 1.1 uUI/mL), but not significantly. CONCLUSION: in conclusion, increasing Se levels via Brazil nut supplementation was associated with improvement in thyroid hormone levels in HD patients, although the amount of Se given was not able to restore T3 to normal levels. Copyright AULA MEDICA EDICIONES 2014. Published by AULA MEDICA. All rights reserved.
BACKGROUND: thyroid function depends on trace mineral selenium (Se), being at the active center of the iodothyronine deiodinase that catalyzes the conversion of the thyroxine (T4) to the active form of thyroid hormone, triiodothyronine (T3). Hemodialysis (HD) patients have reduced T3 levels partly due to impaired hormonal conversion that can be related to Se deficiency, a common feature in these patients. This study evaluated the effect of Brazil nuts (richest Se source) on thyroid hormone levels in HDpatients. METHODS: we performed an uncontrolled intervention with 40 HDpatients (53.3 ± 16.1 yrs, dialysis vintage 62.0 (8.0 - 207.0) months) that received one nut (≈5g, average 58.1 μg Se/g) per day for three months. Se plasma levels were determined by atomic absorption spectrophotometry with hydride generation and, serum T3, free T4 (FT4), TSH as well as glutathione peroxidase (GPx) activity were measured by ELISA. RESULTS: all patients were Se deficient and presented low T3 levels at baseline. After intervention, Se plasma levels (from 17.6 ± 11.6 to 153.4 ± 86.1 μg/L), GPx activity (from 33.7 ± 5.9 to 41.4 ± 11.2 nmol/min/mL), T3 (from 27.3 ± 8.8 to 50.2 ± 4.8ng/dL) and FT4 levels (0.87 ± 0.2 to 0.98 ± 0.4 ng/dL) were significantly increased (p < 0.05), while TSH levels were reduced (from 2.17 ± 1.3 to 1.96 ± 1.1 uUI/mL), but not significantly. CONCLUSION: in conclusion, increasing Se levels via Brazil nut supplementation was associated with improvement in thyroid hormone levels in HDpatients, although the amount of Se given was not able to restore T3 to normal levels. Copyright AULA MEDICA EDICIONES 2014. Published by AULA MEDICA. All rights reserved.
Authors: Tania C Araujo-Jorge; Maria Teresa Rivera; Jean Vanderpas; Luciana R Garzoni; Anna Cristina C Carvalho; Mariana C Waghabi; Marcelo T Holanda; Mauro F F Mediano; Alejandro M Hasslocher-Moreno; Maria da Gloria Bonecini-Almeida; Roberto M Saraiva; Roberto R Ferreira Journal: Biomolecules Date: 2022-02-23