OBJECTIVE: Weight regain after weight loss is common, and there is evidence to suggest negative effects on health because of weight cycling. This study sought to investigate the impact of weight regain in formerly obese mice on adipose tissue architecture and stromal cell function. METHODS: A diet-switch model was employed for obesity induction, weight loss, and weight regain in mice. Flow cytometry quantified adipose tissue leukocytes in adipose tissue. Liver and adipose tissue depots were compared to determine tissue-specific effects of weight cycling. RESULTS: Epididymal white adipose tissue of formerly obese mice failed to expand in response to repeat exposure to high-fat diet and retained elevated numbers of macrophages and T cells. Weight regain was associated with disproportionally elevated liver mass, hepatic triglyceride content, serum insulin concentration, and serum transaminase concentration. These effects occurred despite an extended 6-month weight loss cycle and they demonstrate that formerly obese mice maintain durable alterations in their physiological response to weight regain. Conditioned media from epididymal adipose tissue of formerly obese mice inhibited adipogenesis of 3T3-L1 preadipocytes, suggesting a potential mechanism to explain failed epididymal adipose tissue expansion during weight regain. CONCLUSIONS: Metabolic abnormalities related to defects in adipose tissue expansion and ongoing dysfunction manifest in formerly obese mice during weight regain.
OBJECTIVE: Weight regain after weight loss is common, and there is evidence to suggest negative effects on health because of weight cycling. This study sought to investigate the impact of weight regain in formerly obesemice on adipose tissue architecture and stromal cell function. METHODS: A diet-switch model was employed for obesity induction, weight loss, and weight regain in mice. Flow cytometry quantified adipose tissue leukocytes in adipose tissue. Liver and adipose tissue depots were compared to determine tissue-specific effects of weight cycling. RESULTS: Epididymal white adipose tissue of formerly obesemice failed to expand in response to repeat exposure to high-fat diet and retained elevated numbers of macrophages and T cells. Weight regain was associated with disproportionally elevated liver mass, hepatic triglyceride content, serum insulin concentration, and serum transaminase concentration. These effects occurred despite an extended 6-month weight loss cycle and they demonstrate that formerly obesemice maintain durable alterations in their physiological response to weight regain. Conditioned media from epididymal adipose tissue of formerly obesemice inhibited adipogenesis of 3T3-L1 preadipocytes, suggesting a potential mechanism to explain failed epididymal adipose tissue expansion during weight regain. CONCLUSIONS:Metabolic abnormalities related to defects in adipose tissue expansion and ongoing dysfunction manifest in formerly obesemice during weight regain.
Authors: Shahzeer Karmali; Balpreet Brar; Xinzhe Shi; Arya M Sharma; Christopher de Gara; Daniel W Birch Journal: Obes Surg Date: 2013-11 Impact factor: 4.129
Authors: Nancy Puzziferri; Thomas B Roshek; Helen G Mayo; Ryan Gallagher; Steven H Belle; Edward H Livingston Journal: JAMA Date: 2014-09-03 Impact factor: 56.272
Authors: Katherine J Strissel; Zlatina Stancheva; Hideaki Miyoshi; James W Perfield; Jason DeFuria; Zoe Jick; Andrew S Greenberg; Martin S Obin Journal: Diabetes Date: 2007-09-11 Impact factor: 9.461
Authors: Sandra Barbosa-da-Silva; Julio C Fraulob-Aquino; Jessica R Lopes; Carlos A Mandarim-de-Lacerda; Marcia B Aguila Journal: PLoS One Date: 2012-07-25 Impact factor: 3.240