RESUMO
OBJECTIVE: The objective of the present study was to investigate the effect of vitamin A supplementation on serum Th17 (IL-6, IL-17, IFNγ) and Treg (TGF-ß, IL-10) related cytokines in obese and non-obese women. SUBJECTS AND METHODS: In a randomized double blind placebo controlled design, 56 obese women were randomly assigned to receive either an oral dose of 25,000 IU retinyl palmitate or placebo per day for 4 months. Twenty eight ages matched non-obese women were also received vitamin A. At the study entry, anthropometric variables were measured and serum Th17 and Treg related cytokine profile were determined at baseline and 4 months after intervention. RESULTS: Significantly higher baseline concentrations of IL-6 were observed in obese compared with non-obese women (P < 0.05). However, the initial concentrations of other cytokines were not significantly different between groups. The mean concentrations of IL-17 and TGF-ß were significantly decreased after vitamin A supplementation in non-obese and obese women respectively. Positive relationships between IL-17 and IL-10 (r = 0.42, P < 0.001), TGF-ß and IL-17 (r = 0.35, P < 0.001) and between IL-10 and IFN-γ (r = 0.41, P = 0.002) in total participants were also observed. CONCLUSIONS: The results of the present study showed for the first time that vitamin A supplementation reduces serum concentrations of IL-17 and TGF-ß in reproductive age women. Further studies are needed to explore the possible underlying mechanisms.
Assuntos
Citocinas/sangue , Suplementos Nutricionais , Obesidade/sangue , Vitamina A/administração & dosagem , Vitamina A/uso terapêutico , Vitaminas/administração & dosagem , Adulto , Análise de Variância , Método Duplo-Cego , Feminino , Humanos , Interferon gama/sangue , Interleucina-10/sangue , Interleucina-17/sangue , Interleucina-6/sangue , Estatísticas não Paramétricas , Linfócitos T Reguladores/metabolismo , Células Th17/metabolismo , Fator de Crescimento Transformador beta/sangue , Vitaminas/uso terapêuticoRESUMO
ABSTRACT Objective The objective of the present study was to investigate the effect of vitamin A supplementation on serum Th17 (IL-6, IL-17, IFNγ) and Treg (TGF-β, IL-10) related cytokines in obese and non-obese women. Subjects and methods In a randomized double blind placebo controlled design, 56 obese women were randomly assigned to receive either an oral dose of 25,000 IU retinyl palmitate or placebo per day for 4 months. Twenty eight ages matched non-obese women were also received vitamin A. At the study entry, anthropometric variables were measured and serum Th17 and Treg related cytokine profile were determined at baseline and 4 months after intervention. Results Significantly higher baseline concentrations of IL-6 were observed in obese compared with non-obese women (P < 0.05). However, the initial concentrations of other cytokines were not significantly different between groups. The mean concentrations of IL-17 and TGF-β were significantly decreased after vitamin A supplementation in non-obese and obese women respectively. Positive relationships between IL-17 and IL-10 (r = 0.42, P < 0.001), TGF-β and IL-17 (r = 0.35, P < 0.001) and between IL-10 and IFN-γ (r = 0.41, P = 0.002) in total participants were also observed. Conclusions The results of the present study showed for the first time that vitamin A supplementation reduces serum concentrations of IL-17 and TGF-β in reproductive age women. Further studies are needed to explore the possible underlying mechanisms.