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Jak-TGFβ cross-talk links transient adipose tissue inflammation to beige adipogenesis
Babaei, Rohollah,Schuster, Maximilian,Meln, Irina,Lerch, Sarah,Ghandour, Rayane A.,Pisani, Didier F.,Bayindir-Buchhalter, Irem,Marx, Julia,Wu, Shuang,Schoiswohl, Gabriele,Billeter, Adrian T.,Krunic, D AAAS 2018 Science signaling Vol.11 No.527
<P>The transient activation of inflammatory networks is required for adipose tissue remodeling including the 'browning' of white fat in response to stimuli such as. 3-adrenergic receptor activation. In this process, white adipose tissue acquires thermogenic characteristics through the recruitment of so-called beige adipocytes. We investigated the downstream signaling pathways impinging on adipocyte progenitors that promote de novo formation of adipocytes. We showed that the Jak family of kinases controlled TGF beta signaling in the adipose tissue microenvironment through Stat3 and thereby adipogenic commitment, a function that was required for beige adipocyte differentiation of murine and human progenitors. Jak/Stat3 inhibited TGF beta signaling to the transcription factors Srf and Smad3 by repressing local Tgfb3 and Tgfb1 expression before the core transcriptional adipogenic cascade was activated. This pathway cross-talk was triggered in stromal cells by ATGL-dependent adipocyte lipolysis and a transient wave of IL-6 family cytokines at the onset of adipose tissue remodeling induced by beta 3-adrenergic receptor stimulation. Our results provide insight into the activation of adipocyte progenitors and are relevant for the therapeutic targeting of adipose tissue inflammatory pathways.</P>
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