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Cannabinoid Type 1 Receptors Are Upregulated During Acute Activation of Brown Adipose Tissue
Univ Turku, Turku PET Ctr, Turku, Finland;Turku Univ Hosp, Turku PET Ctr, Turku, Finland.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Theranostics. Abo Akad Univ, Turku PET Ctr, Turku, Finland.ORCID iD: 0000-0002-2515-8790
Univ Bonn, Inst Pharmacol & Toxicol, Bonn, Germany.
Univ Turku, Turku PET Ctr, Turku, Finland.ORCID iD: 0000-0002-1947-0219
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2018 (English)In: Diabetes, ISSN 0012-1797, E-ISSN 1939-327X, Vol. 67, no 7, p. 1226-1236Article in journal (Refereed) Published
Abstract [en]

Activating brown adipose tissue (BAT) could provide a potential approach for the treatment of obesity and metabolic disease in humans. Obesity is associated with upregulation of the endocannabinoid system, and blocking the cannabinoid type 1 receptor (CB1R) has been shown to cause weight loss and to decrease cardiometabolic risk factors. These effects may be mediated partly via increased BAT metabolism, since there is evidence that CB1R antagonism activates BAT in rodents. To investigate the significance of CB1R in BAT function, we quantified the density of CB1R in human and rodent BAT using the positron emission tomography radioligand [F-18]FMPEP-d(2) and measured BAT activation in parallel with the glucose analog [F-18]fluorodeoxyglucose. Activation by cold exposure markedly increased CB1R density and glucose uptake in the BAT of lean men. Similarly, 3-receptor agonism increased CB1R density in the BAT of rats. In contrast, overweight men with reduced BAT activity exhibited decreased CB1R in BAT, reflecting impaired endocannabinoid regulation. Image-guided biopsies confirmed CB1R mRNA expression in human BAT. Furthermore, CB1R blockade increased glucose uptake and lipolysis of brown adipocytes. Our results highlight that CB1Rs are significant for human BAT activity, and the CB1Rs provide a novel therapeutic target for BAT activation in humans.

Place, publisher, year, edition, pages
AMER DIABETES ASSOC , 2018. Vol. 67, no 7, p. 1226-1236
National Category
Endocrinology and Diabetes
Identifiers
URN: urn:nbn:se:uu:diva-358271DOI: 10.2337/db17-1366ISI: 000435927000003PubMedID: 29650773OAI: oai:DiVA.org:uu-358271DiVA, id: diva2:1242901
Funder
EU, FP7, Seventh Framework Programme, 278373German Research Foundation (DFG), GN 108/1-1German Research Foundation (DFG), RTG 1873Available from: 2018-08-29 Created: 2018-08-29 Last updated: 2018-08-29Bibliographically approved

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Eriksson, Olof

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