TUG‐891 increases oxygen consumption by brown adipocytes, mediated by direct UCP1 activation and mitochondrial fragmentation TUG‐891 increases oxygen consumption.

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TUG‐891 increases oxygen consumption by brown adipocytes, mediated by direct UCP1 activation and mitochondrial fragmentation TUG‐891 increases oxygen consumption by brown adipocytes, mediated by direct UCP1 activation and mitochondrial fragmentation AImmortalized brown adipocyte (n = 5–6) was pretreated with either vehicle or the GPR120 antagonist AH7614 (100 μM) for 30 min, followed by measurement of the basal oxygen consumption rate (OCR) for 15 min in a Seahorse XF24 analyzer. Hereafter, cells were treated with either vehicle or the GPR120 agonist TUG‐891 (10 μM) and OCR was measured for another 30 min.B, CRepresentative traces showing the effects of TUG‐891 (heavy line) and vehicle (thin line) on oxygen consumption in BAT mitochondria (0.125 mg/ml) from WT (B) and UCP1 KO (C) mice (n = 4–5). Additions were mitochondria (M), GDP (1 mM), TUG‐891 (successively added in the concentration range of 10–150 μM), and FCCP (1.0–1.4 μM). The breaks in trace indicate periods of chamber re‐oxygenation.DImmortalized brown adipocytes (n = 5–6) were pretreated for 30 min with vehicle or BAPTA‐AM (25 μM), after which the OCR was determined in a Seahorse XF24 analyzer. After three baseline measurements, either vehicle or TUG‐891 (10 μM) was injected into the wells.EWT and GPR120 KO brown adipocytes were incubated with the calcium‐sensitive dye Fluo‐4‐AM for 1 h at RT, followed by live cell imaging with a confocal laser scanning microscope (LSM 510, Zeiss) and stimulation with TUG‐891 (10 μM) with or without the presence of AH7614 (100 μM). F1/F0 represents peak fluorescence divided by baseline fluorescence.FRepresentative images of a brown adipocyte stained with MitoTracker Green FM (125 nM) and MitoTracker Red CMXRos (250 nM) before and after stimulation with TUG‐891 (10 μM) for 10 min. Fluorescence intensity of MTR/MTG was determined in TUG‐891‐treated cells and controls (n = 8–9) at baseline and after 10 min of fluorescence imaging, and plotted relative to baseline.GRepresentative images of a brown adipocyte stained with MitoTracker Green FM at baseline (0 min) and 2, 4, and 8 min after TUG‐891 stimulation. MitoTracker‐stained live cells were imaged using a confocal laser scanning microscope (Leica TCS SP8, Leica Microsystems).Data information: Data represent means ± SEM. **P < 0.01, ***P < 0.001 compared to the vehicle group, #P < 0.05 compared to the TUG‐891 control group (or baseline in Fig 7F), according to the two‐tailed unpaired Student's t‐test. The exact P‐value for each significant difference can be found in Appendix Table S5. Maaike Schilperoort et al. EMBO Mol Med. 2018;10:e8047 © as stated in the article, figure or figure legend