Luiz Carlos Caetano1, Maria Lúcia Bonfleur2, Rosane Aparecida Ribeiro3, Tarlliza Romanna Nardelli4, Camila Lubaczeuski1, Juliana do Nascimento da Silva3, Everardo Magalhães Carneiro4, Sandra Lucinei Balbo1. 1. Laboratório de Fisiologia Endócrina e Metabolismo (LAFEM), Centro de Ciências Biológicas e da Saúde, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, PR, 858119-110, Brazil. 2. Laboratório de Fisiologia Endócrina e Metabolismo (LAFEM), Centro de Ciências Biológicas e da Saúde, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, PR, 858119-110, Brazil. mlbonfleur@hotmail.com. 3. Universidade Federal do Rio de Janeiro (UFRJ), Campus UFRJ-Macaé, Macaé, RJ, Brazil. 4. Laboratório de Pâncreas Endócrino e Metabolismo, Departamento de Biologia Estrutural e Funcional, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil.
Abstract
PURPOSE: Obesity is usually associated with low-grade inflammation, which impairs insulin action. The amino acid, taurine (TAU), regulates glucose homeostasis and lipid metabolism and presents anti-inflammatory actions. Here, we evaluated whether inflammatory markers are altered in the serum and retroperitoneal adipose tissue of monosodium glutamate (MSG) obese rats, supplemented or not with TAU. METHODS: Male Wistar rats received subcutaneous injections of MSG (4 mg/kg body weight/day, MSG group) or hypertonic saline (CTL) during the first 5 days of life. From 21 to 120 days of age, half of each of the MSG and CTL groups received 2.5 % TAU in their drinking water (CTAU and MTAU). RESULTS: At 120 days of age, MSG rats were obese and hyperinsulinemic. TAU supplementation reduced fat deposition without affecting insulinemia in MTAU rats. MSG rats presented increased pIκ-Bα/Iκ-Bα protein expression in the retroperitoneal adipose tissue. TAU supplementation decreased the ratio of pIκ-Bα/Iκ-Bα protein, possibly contributing to the increased Iκ-Bα content in MTAU adipose tissue. Furthermore, MSG obesity or supplementation did not alter TNF-α, IL-1β or IL-6 content in adipose tissue. In contrast, MSG rats presented lower serum TNF-α, IL-4 and IL-10 concentrations, and these alterations were prevented by TAU treatment. CONCLUSION: MSG obesity in rats was not associated with alterations in pro-inflammatory markers in retroperitoneal fat stores; however, reductions in the serum concentrations of anti-inflammatory cytokines and of TNF-α were observed. TAU treatment decreased adiposity, and this effect was associated with the normalization of circulating TNF-α and IL-4 concentrations in MTAU rats.
PURPOSE:Obesity is usually associated with low-grade inflammation, which impairs insulin action. The amino acid, taurine (TAU), regulates glucose homeostasis and lipid metabolism and presents anti-inflammatory actions. Here, we evaluated whether inflammatory markers are altered in the serum and retroperitoneal adipose tissue of monosodium glutamate (MSG) obeserats, supplemented or not with TAU. METHODS: Male Wistar rats received subcutaneous injections of MSG (4 mg/kg body weight/day, MSG group) or hypertonic saline (CTL) during the first 5 days of life. From 21 to 120 days of age, half of each of the MSG and CTL groups received 2.5 % TAU in their drinking water (CTAU and MTAU). RESULTS: At 120 days of age, MSG rats were obese and hyperinsulinemic. TAU supplementation reduced fat deposition without affecting insulinemia in MTAU rats. MSG rats presented increased pIκ-Bα/Iκ-Bα protein expression in the retroperitoneal adipose tissue. TAU supplementation decreased the ratio of pIκ-Bα/Iκ-Bα protein, possibly contributing to the increased Iκ-Bα content in MTAU adipose tissue. Furthermore, MSG obesity or supplementation did not alter TNF-α, IL-1β or IL-6 content in adipose tissue. In contrast, MSG rats presented lower serum TNF-α, IL-4 and IL-10 concentrations, and these alterations were prevented by TAU treatment. CONCLUSION: MSG obesity in rats was not associated with alterations in pro-inflammatory markers in retroperitoneal fat stores; however, reductions in the serum concentrations of anti-inflammatory cytokines and of TNF-α were observed. TAU treatment decreased adiposity, and this effect was associated with the normalization of circulating TNF-α and IL-4 concentrations in MTAU rats.
Authors: V Chaparro-Huerta; M C Rivera-Cervantes; M E Flores-Soto; U Gómez-Pinedo; C Beas-Zárate Journal: J Neuroimmunol Date: 2005-08 Impact factor: 3.478
Authors: F S Lira; A S Yamashita; J C Rosa; C H Koyama; E C Caperuto; M L Batista; M C L Seelaender Journal: Horm Metab Res Date: 2012-01-20 Impact factor: 2.936