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Obesity has increased to pandemic levels and enhanced understanding of adipose regulation is required for new treatment strategies. Although bone morphogenetic proteins (BMPs) influence adipogenesis, the effect of BMP antagonists such as Noggin is largely unknown. The aim of the study was to define the role of Noggin, an extracellular BMP inhibitor, in adipogenesis.
Activation of the Wnt-signaling pathway is known to inhibit differentiation in adipocytes. However, there is a gap in our understanding of the transcriptional network regulated by components of the Wnt-signaling pathway during adipogenesis and in adipocytes during postnatal life. The key intracellular effectors of the Wnt-signaling pathway occur through TCF transcription factors such as TCF7L2 (transcription factor-7-like 2). Several genetic variants in proximity to TCF7L2 have been linked to type 2 diabetes through genome-wide association studies in various human populations. Our work aims to functionally characterize the adipocyte specific gene program regulated by TCF7L2 and understand how this program regulates metabolism.
The protein phosphatase 1-like gene (PPM1l) was identified as causal gene for obesity and metabolic abnormalities in mice. However, the underlying mechanisms were unknown. In this report, we find PPM1l encodes an endoplasmic reticulum (ER) membrane targeted protein phosphatase (PP2Ce) and has specific activity to basal and ER stress induced auto-phosphorylation of Inositol-REquiring protein-1 (IRE1). PP2Ce inactivation resulted in elevated IRE1 phosphorylation and higher expression of XBP-1, CHOP, and BiP at basal. However, ER stress stimulated XBP-1 and BiP induction was blunted while CHOP induction was further enhanced in PP2Ce null cells. PP2Ce protein levels are significantly induced during adipogenesis in vitro and are necessary for normal adipocyte maturation. Finally, we provide evidence that common genetic variation of PPM11 gene is significantly associated with human lipid profile. Therefore, PPM1l mediated IRE1 regulation and downstream ER stress signaling is a plausible molecular basis for its role in metabolic regulation and disorder.
Mitochondria are organelles primarily responsible for energy production, and recent evidence indicates that alterations in size, shape, location, and quantity occur in response to fluctuations in energy supply and demand. We tested the impact of acute and chronic exercise on mitochondrial dynamics signaling and determined the impact of the mitochondrial fission regulator Dynamin related protein (Drp)1 on exercise performance and muscle adaptations to training.
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