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Learn MoreThe innate immune system safeguards the organism from both pathogenic and environmental stressors. Even physiological levels of nutrients affect organismal and intra-cellular metabolism and challenge the immune system. In the long term, over-nutrition leads to low-grade systemic inflammation. Here, we investigate tissue-resident components of the innate immune-system macrophages and their response to short-term and long-term nutritional challenges. We analyze the transcriptomes of seven tissue-resident macrophage populations upon metabolic challenge and identify adipose tissue macrophages and the IL-1 pathway as early sensors of metabolic changes. Furthermore, by comparing functional responses between macrophage subtypes, we propose a regulatory, anti-inflammatory role of heat shock proteins of the HSP70 family in response to a metabolic challenge. Our data provides a resource for assessing the impact of nutrition and over-nutrition on the spectrum of macrophages across tissues with a potential for identification of systemic responses. SOURCE: Marc Donath (Marc.Donath@usb.ch) - Diabetes Research Laboratory University of Basel
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