UNLABELLED: Brown adipose tissue (BAT) densities assessed as CT Hounsfield units (HUs) were evaluated in a rodent model and in patients to determine whether HUs changed in relation to BAT activity. METHODS: Serial (18)F-FDG PET/CT was performed on rats under both room temperature control conditions and after 4 h of cold-stimulation, which is known to activate BAT. The maximum standardized uptake values and CT HUs of BAT were measured, and tissues were examined in the laboratory. Image records from cancer patients who underwent PET/CT were reviewed, and 23 patients were identified who displayed both high and low (18)F-FDG uptake into BAT on serial (18)F-FDG PET/CT scans. The maximum standardized uptake values and CT HUs of BAT were compared in these scans. RESULTS: The mean (+/-SD) CT HUs of cold-activated BAT (-12.4 +/- 22.4) were significantly higher than those (-27.9 +/- 9.6) of the controls in the rat model. The CT HUs of BAT (-71.6 +/- 18.0) in the patients with high (18)F-FDG uptake were significantly higher than those (-104.4 +/- 16.8) of the patients with low (18)F-FDG uptake . A decrease in relative lipid content is seen in activated BAT in rats on histology. CONCLUSION: The CT HUs of BAT increased in activated conditions in both animals and patients, likely because of lipid consumption by activated BAT.
UNLABELLED: Brown adipose tissue (BAT) densities assessed as CT Hounsfield units (HUs) were evaluated in a rodent model and in patients to determine whether HUs changed in relation to BAT activity. METHODS: Serial (18)F-FDG PET/CT was performed on rats under both room temperature control conditions and after 4 h of cold-stimulation, which is known to activate BAT. The maximum standardized uptake values and CT HUs of BAT were measured, and tissues were examined in the laboratory. Image records from cancerpatients who underwent PET/CT were reviewed, and 23 patients were identified who displayed both high and low (18)F-FDG uptake into BAT on serial (18)F-FDG PET/CT scans. The maximum standardized uptake values and CT HUs of BAT were compared in these scans. RESULTS: The mean (+/-SD) CT HUs of cold-activated BAT (-12.4 +/- 22.4) were significantly higher than those (-27.9 +/- 9.6) of the controls in the rat model. The CT HUs of BAT (-71.6 +/- 18.0) in the patients with high (18)F-FDG uptake were significantly higher than those (-104.4 +/- 16.8) of the patients with low (18)F-FDG uptake . A decrease in relative lipid content is seen in activated BAT in rats on histology. CONCLUSION: The CT HUs of BAT increased in activated conditions in both animals and patients, likely because of lipid consumption by activated BAT.
Authors: Curtis Tilves; Joseph M Zmuda; Allison L Kuipers; J Jeffrey Carr; James G Terry; Victor Wheeler; Shyamal D Peddada; Sangeeta Nair; Iva Miljkovic Journal: Obesity (Silver Spring) Date: 2019-12-24 Impact factor: 5.002
Authors: Jiantao Ma; Nicola M McKeown; Shih-Jen Hwang; Udo Hoffmann; Paul F Jacques; Caroline S Fox Journal: Circulation Date: 2016-01-11 Impact factor: 29.690
Authors: Véronique Ouellet; Sébastien M Labbé; Denis P Blondin; Serge Phoenix; Brigitte Guérin; François Haman; Eric E Turcotte; Denis Richard; André C Carpentier Journal: J Clin Invest Date: 2012-01-24 Impact factor: 14.808
Authors: Aidan Flynn; Qian Li; Marcello Panagia; Amr Abdelbaky; Megan MacNabb; Anthony Samir; Aaron M Cypess; Arthur E Weyman; Ahmed Tawakol; Marielle Scherrer-Crosbie Journal: J Am Soc Echocardiogr Date: 2015-08-05 Impact factor: 5.251