Abstract
Intuitively, excess caloric intake causes adipose tissue expansion. However, the signals and mechanisms by which this systemic trigger directs a local response in the adipose tissue are incompletely understood. Both hypertrophy of existing adipocytes and the generation of new adipocytes through differentiation of adipocyte precursor cells (APCs), contribute to adipose tissue expansion in response to changes in the diet. Ex vivo studies of this process elucidated an elegant network of mostly transcription factors that drive APCs through the differentiation (adipogenesis) process. Here we discuss our study that identified an Adamts1 signal as a glucocorticoid and diet responsive regulator of an extracellular relay system that modulates the initiation of this intracellular adipogenesis program in APCs. Furthermore, we describe how we applied sensitive tools that enable monitoring of endogenous APC activity to study the early response to high-fat diet in vivo.