Project description:Brown and beige fat share a remarkably similar transcriptional program that supports fuel oxidation and thermogenesis. The chromatin-remodeling machinery that governs genome accessibility and renders adipocytes poised for thermogenic activation remains elusive. BAF60a serves an indispensable role in cold-induced thermogenesis in brown fat. Surprisingly, fat-specific BAF60a inactivation triggers more pronounced browning of inguinal white adipose tissue. These results suggest a dichotomous role of BAF60a-mediated chromatin remodeling in transcriptional control of brown and beige gene programs. To elucidate the mechanism, we performed microarray annalysis in inguinal white adipose tissues from mice after chronic cold exposure.
Project description:We report that the HF/HS-mediated functional enrichment of genes of immunity and inflammation is driven toward normal by the AOF supplementation Obesity may not constantly associate with metabolic disorders and mortality later in life, raising the challenging concept of healthy obesity. Here, high fat-high sucrose (HF/HS) feeding produces hyperglycaemia and hypercholesterolemia, increases oxidative stress, elevates endotoxemia, expands adipose tissue (with enlarged adipocytes, macrophage infiltration and accumulation of cholesterol and oxysterols), and reduces lifespan of obese mice. Despite persistence of obesity, supplementation with an antioxidant formulation normalizes plasma lipids and endotoxemia, prevents macrophage recruitment in adipose tissue, reduces adipose accumulation of cholesterol and cholesterol oxides, and extends lifespan. The HF/HS-mediated functional enrichment of genes of immunity and inflammation (in particular response to lipopolysaccharides) is driven towards normal by the antioxidant formulation. It is concluded that the limitation of immune cell infiltration in adipose tissue on the long term by an antioxidant formulation can increase lifespan independently of body weight and fat storage. It constitutes the hallmark of a healthy adiposity trait.
Project description:This project aims to identify the proteins present in RNA granules of brown adipose tissue upon exposure to cold challenge. Wild type C57BL/6J mice were born and raised at thermoneutrality and were then subjected to cold exposure for 90 minutes. Brown adipose tissues were collected, and the protein lysates of RNA granules isolated from the brown adipose tissues were separated using SDS-PAGE gels and visualized with Coomassie stain. The protein bands were subsequently excised for downstream sample processing.
Project description:The transcriptomic expression in adipose tissues of Adipo-SIRT1 and Adipo-H363Y are compared and related to those of the wild type (WT) controls. Total RNA was extracted from epididymal adipose tissues of mice aged eight- or 40-weeks, either fed ad libitum or subjected to calorie restriction. Affymetrix Mouse Genome 430 2.0 expression arrays were used.
Project description:Transcriptional profiling of transgenic mice specifically expressing amphiregulin in white adipose tissues. The objective of this study is to explore gene expression profiles of adipose tissues in response to amphiregulin overexpression.