Inter-relação do Gama- orizanol e ativação dos receptores Adipo- R1 e Adipo- R2: possível efeito na melhora da função renal associada à obesidade
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Data
2018-03-02
Autores
Francisqueti, Fabiane Valentini [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A obesidade está associada a diversas comorbidades, como dislipidemia, hipertrigliceridemia, resistência à insulina (RI) e diabetes mellitus tipo 2, além de estresse oxidativo e inflamação. Além disso, na obesidade ocorre um desequilíbrio na produção de adipocinas, com aumento de citocinas proinflamatórias e diminuição de adiponectina, o que pode ocasionar disfunções renais e metabólicas. O γ-orizanol, composto presente no arroz, têm demonstrado potencial ação antiadipogênica, anti-inflamatória e antioxidante. Sendo assim o objetivo deste estudo foi avaliar os efeitos do γ-orizanol sobre a ativação dos receptores Adipo- R1 e Adipo- R2 e seus papéis na melhora da função renal. Foram utilizados ratos Wistar machos (n=60 animais), 21 dias de idade, provenientes Biotério Central da Faculdade de Medicina de Botucatu. Os animais foram divididos em seis grupos (n=10 animais/grupo) para receberem dieta padrão (G1), dieta padrão + γ-orizanol (G2), dieta rica em carboidratos (G3), dieta rica em carboidratos no início e depois com γ-orizanol (G4), dieta rica em carboidratos no início e depois dieta padrão + γ-orizanol (G5) e dieta rica em carboidrato + γ-orizanol (G6) por 30 semanas. Detectada a proteinuria, o grupo G4 começou a receber γ-orizanol e o grupo G5 teve a troca da ração. A obesidade foi caracterizada pelo índice de adiposidade e comorbidades: pressão arterial sistêmica, perfis glicêmico, lipídico e hormonal. No tecido adiposo foi analisado o perfil inflamatório por ELISA. A função renal foi avaliada pela proteinuria e foi também analisado o perfil inflamatório e estresse oxidativo. Após o período experimental, os animais que receberam o tratamento com o composto tiveram uma recuperação da função renal, melhora da inflamação e estresse oxidativo renais. Como conclusão, o composto se mostrou efetivo na recuperação da função renal associada à obesidade.
Obesity is associated with several comorbidities such as dyslipidemia, hypertriglyceridemia, insulin resistance (IR) and diabetes mellitus type 2, and also oxidative stress and inflammation, situations that trigger an imbalance in production adipokine, or increase of proinflammatory cytokines and decreased adiponectin. This condition can lead renal and metabolic disorders. γ-oryzanol, main phytosterol present in rice has shown potential antiadipogênica, anti-inflammatory and antioxidant action. Thus the aim of this study was to evaluate, the effects of γ-oryzanol on the activation of Adipo-R1 and Adipo-R2 receptors and their role in improvement of renal function. It was used male Wistar rats (n = 60 animals), 21 days old, from Central Animal Laboratory of the Botucatu Medical School. The animals were be divided into six groups (n = 10 animals / group) to receive standard diet (G1), standard diet + γ-oryzanol (G2), high-carbohydrate diet (G3), high-carbohydrate diet at first and then with γ-oryzanol (G4), high-carbohydrate diet at first and then standard diet + γ-oryzanol (G5) and high carbohydrate diet + γ-oryzanol (G6) for 30 weeks. When detected proteinuria, the G4 group started receiving γ-oryzanol and the G5 group was the exchange of the feed. Obesity was characterized by adiposity index and co-morbidities: blood pressure, blood glucose, lipid and hormonal. In adipose tissue was analyzed the inflammatory profile for ELISA. Renal function was evaluated by proteinuria. It was analyzed the inflammatory status and oxidative stress in renal tissue. After the treatment, the animals presented a recovery of renal function, improvement of inflammation and oxidative stress. So, it is possible to conclude that γ-oryzanol was effective to recovery renal function associated to obesity.
Obesity is associated with several comorbidities such as dyslipidemia, hypertriglyceridemia, insulin resistance (IR) and diabetes mellitus type 2, and also oxidative stress and inflammation, situations that trigger an imbalance in production adipokine, or increase of proinflammatory cytokines and decreased adiponectin. This condition can lead renal and metabolic disorders. γ-oryzanol, main phytosterol present in rice has shown potential antiadipogênica, anti-inflammatory and antioxidant action. Thus the aim of this study was to evaluate, the effects of γ-oryzanol on the activation of Adipo-R1 and Adipo-R2 receptors and their role in improvement of renal function. It was used male Wistar rats (n = 60 animals), 21 days old, from Central Animal Laboratory of the Botucatu Medical School. The animals were be divided into six groups (n = 10 animals / group) to receive standard diet (G1), standard diet + γ-oryzanol (G2), high-carbohydrate diet (G3), high-carbohydrate diet at first and then with γ-oryzanol (G4), high-carbohydrate diet at first and then standard diet + γ-oryzanol (G5) and high carbohydrate diet + γ-oryzanol (G6) for 30 weeks. When detected proteinuria, the G4 group started receiving γ-oryzanol and the G5 group was the exchange of the feed. Obesity was characterized by adiposity index and co-morbidities: blood pressure, blood glucose, lipid and hormonal. In adipose tissue was analyzed the inflammatory profile for ELISA. Renal function was evaluated by proteinuria. It was analyzed the inflammatory status and oxidative stress in renal tissue. After the treatment, the animals presented a recovery of renal function, improvement of inflammation and oxidative stress. So, it is possible to conclude that γ-oryzanol was effective to recovery renal function associated to obesity.
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Palavras-chave
obesidade, doença renal, high sugar- fat diet, gama- orizanol, obesity, renal disease, gamma- oryzanol