Abstract
Macrophages are cells of the immune system that have been suggested as important regulators of whole-body metabolism in mammals. In obesity, adipose tissue macrophages (ATMs) are thought to play both a detrimental and a beneficial role in the regulation of insulin sensitivity. Here, we describe a protocol to prepare and administer glucan-encapsulated RNAi particles (GeRPs), for specific delivery of siRNA and subsequent gene silencing in ATMs in obese mice. Using the GeRP technology to silence genes provides a unique method to study the function of factors expressed by ATMs in the regulation of metabolism.
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References
Kahn SE, Hull RL, Utzschneider KM (2006) Mechanisms linking obesity to insulin resistance and type 2 diabetes. Nature 444(7121):840–846. https://doi.org/10.1038/nature05482
Lumeng CN, Bodzin JL, Saltiel AR (2007) Obesity induces a phenotypic switch in adipose tissue macrophage polarization. J Clin Invest 117(1):175–184. https://doi.org/10.1172/JCI29881
Wu D, Molofsky AB, Liang HE, Ricardo-Gonzalez RR, Jouihan HA, Bando JK, Chawla A, Locksley RM (2011) Eosinophils sustain adipose alternatively activated macrophages associated with glucose homeostasis. Science 332(6026):243–247. https://doi.org/10.1126/science.1201475
Weisberg SP, McCann D, Desai M, Rosenbaum M, Leibel RL, Ferrante AW Jr (2003) Obesity is associated with macrophage accumulation in adipose tissue. J Clin Invest 112(12):1796–1808. https://doi.org/10.1172/JCI19246
Xu H, Barnes GT, Yang Q, Tan G, Yang D, Chou CJ, Sole J, Nichols A, Ross JS, Tartaglia LA, Chen H (2003) Chronic inflammation in fat plays a crucial role in the development of obesity-related insulin resistance. J Clin Invest 112(12):1821–1830. https://doi.org/10.1172/JCI19451
Aouadi M, Tesz GJ, Nicoloro SM, Wang M, Chouinard M, Soto E, Ostroff GR, Czech MP (2009) Orally delivered siRNA targeting macrophage map 4k4 suppresses systemic inflammation. Nature 458(7242):1180–1184. https://doi.org/10.1038/nature07774
Tesz GJ, Aouadi M, Prot M, Nicoloro SM, Boutet E, Amano SU, Goller A, Wang M, Guo CA, Salomon WE, Virbasius JV, Baum RA, O'Connor MJ Jr, Soto E, Ostroff GR, Czech MP (2011) Glucan particles for selective delivery of siRNA to phagocytic cells in mice. Biochem J 436(2):351–362. https://doi.org/10.1042/BJ20110352
Aouadi M, Tencerova M, Vangala P, Yawe JC, Nicoloro SM, Amano SU, Cohen JL, Czech MP (2013) Gene silencing in adipose tissue macrophages regulates whole-body metabolism in obese mice. Proc Natl Acad Sci U S A 110(20):8278–8283. https://doi.org/10.1073/pnas.1300492110
Tencerova M, Aouadi M, Vangala P, Nicoloro SM, Yawe JC, Cohen JL, Shen Y, Garcia-Menendez L, Pedersen DJ, Gallagher-Dorval K, Perugini RA, Gupta OT, Czech MP (2015) Activated Kupffer cells inhibit insulin sensitivity in obese mice. FASEB J 29(7):2959–2969. https://doi.org/10.1096/fj.15-270496
Aouadi M, Vangala P, Yawe JC, Tencerova M, Nicoloro SM, Cohen JL, Shen Y, Czech MP (2014) Lipid storage by adipose tissue macrophages regulates systemic glucose tolerance. Am J Physiol Endocrinol Metab 307(4):E374–E383. https://doi.org/10.1152/ajpendo.00187.2014
Acknowledgment
We would like to thank Tarja Schröder for the tissue histology and Kjell Hultenby for the electron microscopy. This work was supported by research grants from AstraZeneca through the ICMC (M.A.), the Swedish Research Council (M.A.: 2015-03582), and the Novo Nordisk Foundation, including the Tripartite Immuno-metabolism Consortium (M.A. and TrIC; NNF15CC0018486) and the Strategic Research Program in Diabetes at Karolinska Institutet (M.A.).
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Barreby, E., Sulen, A., Aouadi, M. (2019). Glucan-Encapsulated siRNA Particles (GeRPs) for Specific Gene Silencing in Adipose Tissue Macrophages. In: Gage, M., Pineda-Torra, I. (eds) Lipid-Activated Nuclear Receptors. Methods in Molecular Biology, vol 1951. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-9130-3_4
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DOI: https://doi.org/10.1007/978-1-4939-9130-3_4
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Online ISBN: 978-1-4939-9130-3
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