Analysis of gene expression related energy and lipid metabolism in women with obesity grade III after decaffeinated green tea extract supplementation

Author(s)

Driele Cristina Gomes Quinhoneiro

• Document type: Master's Dissertation
• Press: Ribeirão Preto.
• Institution: Universidade de São Paulo (USP). Faculdade de Medicina de Ribeirão Preto (PCARP/BC)
• Defense date: 2016-08-19

Examining board members

Carla Barbosa Nonino; Dennys Esper Corrêa Cintra

• Advisor: Carla Barbosa Nonino

Abstract

Obesity emerges as neuroendocrine disorder, with action of environmental and genetic risk factors, and recently hundreds of genes have been associated with management of body weight and energy metabolism. As obesity rates continue to climb in population, an increased number of strategies are employed in order to improve effectiveness of weight loss, such as use of bioactive compounds in foods, especially Epigallocatechin gallate (EGCG) present in green tea. Polyphenol-rich foods have anti-obesogenic effects, possibly by its direct or indirect interaction with adipose tissue. This study aimed to verify expression of UCPs, PLIN1, PPARG2 and ADRB3 in abdominal subcutaneous adipose tissue of women with obesity grade III before and after eight weeks of supplementation with decaffeinated green tea extract and associate with anthropometric, metabolic rate (RMR), substrate oxidation and energy intake. The sample consisted of 11 women with obesity grade III submitted to supplementation of 450 mg of green tea for eight weeks (intervention group) and 10 women eutrophic (control group). This was a longitudinal study and were collected anthropometric measurements of weight and height to calculate body mass index (BMI); abdominal circumference (AC); body composition (fat-free mass and fat mass) by bioelectrical impedance analysis; energy intake by 24-hour dietary recalls; TMR by indirect calorimetry and gene expression analysis by real-time PCR (RT-qPCR). After eight weeks of supplementation, the intervention group showed no changes in anthropometric variables, body composition, TMR and substrate oxidation. When comparing control group and intervention, is noted that first had lower values of BMI, WC, fat-free mass, fat mass, RMR and oxidation of lipids. Genetic analysis show an increased expression of UCP3 gene after the supplementation period (p = 0.026). The correlation and linear regression analysis revealed that women with obesity grade III before green tea supplementation that expressed more UCP2 had lower weight (p = 0.043) and fat mass (p = 0.045). Still, those that had higher energy intake, exhibited increased expression of UCP2 (p = 0.045). We conclude that the decaffeinated green tea extract supplementation for 8 weeks in women with obesity grade III, does not alter the expression of UCP1, UCP2, PLIN1, PPARG2 and ADRB3, which could explain maintenance of anthropometric variables, composition body, resting metabolic rate and substrate oxidation. Moreover, there is increased UCP3 expression after supplementation, suggesting a possible adjustment mechanism of this gene acting in weight management. (AU)

• FAPESP's process: 14/00669-0 - Analysis of the genes expression related to energy expenditure and lipid metabolism in individuals with grade III obesity before and after supplementation with green tea
• Grantee: Driele Cristina Gomes Quinhoneiro
• Support Opportunities: Scholarships in Brazil - Master