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Alternatively activated macrophages do not synthesize catecholamines or contribute to adipose tissue adaptive thermogenesis
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Number of Authors: 29
2017 (English)In: Nature Medicine, ISSN 1078-8956, E-ISSN 1546-170X, Vol. 23, no 5, 623-630 p.Article in journal (Refereed) Published
Abstract [en]

Adaptive thermogenesis is the process of heat generation in response to cold stimulation. It is under the control of the sympathetic nervous system, whose chief effector is the catecholamine norepinephrine (NE). NE enhances thermogenesis through beta 3-adrenergic receptors to activate brown adipose tissue and by 'browning' white adipose tissue. Recent studies have reported that alternative activation of macrophages in response to interleukin (IL)-4 stimulation induces the expression of tyrosine hydroxylase (TH), a key enzyme in the catecholamine synthesis pathway, and that this activation provides an alternative source of locally produced catecholamines during the thermogenic process. Here we report that the deletion of Th in hematopoietic cells of adult mice neither alters energy expenditure upon cold exposure nor reduces browning in inguinal adipose tissue. Bone marrow-derived macrophages did not release NE in response to stimulation with IL-4, and conditioned media from IL-4-stimulated macrophages failed to induce expression of thermogenic genes, such as uncoupling protein 1 (Ucp1), in adipocytes cultured with the conditioned media. Furthermore, chronic treatment with IL-4 failed to increase energy expenditure in wild-type, Ucp1(-/-) and interleukin-4 receptor-alpha double-negative (Il4ra(-/-)) mice. In agreement with these findings, adipose-tissue-resident macrophages did not express TH. Thus, we conclude that alternatively activated macrophages do not synthesize relevant amounts of catecholamines, and hence, are not likely to have a direct role in adipocyte metabolism or adaptive thermogenesis.

Place, publisher, year, edition, pages
2017. Vol. 23, no 5, 623-630 p.
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Biochemistry and Molecular Biology
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URN: urn:nbn:se:su:diva-143404DOI: 10.1038/nm.4316ISI: 000400650700017PubMedID: 28414329OAI: oai:DiVA.org:su-143404DiVA: diva2:1101177
Available from: 2017-05-29 Created: 2017-05-29 Last updated: 2017-05-29Bibliographically approved

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Kalinovich, Anastasia V.Petrovic, NatasaNedergaard, JanCannon, Barbara
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Department of Molecular Biosciences, The Wenner-Gren Institute
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