In vivo imaging of brown adipose tissue vasculature reactivity during adrenergic stimulation of non-shivering thermogenesis in mice.

Autor: Garside JC; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.; Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA., Livingston EW; Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA., Frank JE; Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA., Yuan H; Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.; Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA., Branca RT; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. rtbranca@unc.edu.; Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. rtbranca@unc.edu.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Dec 10; Vol. 12 (1), pp. 21383. Date of Electronic Publication: 2022 Dec 10.
DOI: 10.1038/s41598-022-25819-6
Abstrakt: Brown adipose tissue (BAT) is a fat tissue specialized in heat production (non-shivering thermogenesis) and used by mammals to defend core body temperature when exposed to cold. Several studies have shown that during non-shivering thermogenesis the increase in BAT oxygen demand is met by a local and specific increase in tissue's blood flow. While the vasculature of BAT has been extensively studied postmortem in rodents using histology, optical and CT imaging techniques, vasculature changes during stimulation of non-shivering thermogenesis have never been directly detected in vivo. Here, by using computed tomography (CT) angiography with gold nanoparticles we investigate, non-invasively, changes in BAT vasculature during adrenergic stimulation of non-shivering thermogenesis by norepinephrine, a vasoconstrictor known to mediate brown fat heat production, and by CL 316,243, a specific β 3 -adrenergic agonist also known to elicit BAT thermogenesis in rodents. We found that while CL 316,243 causes local vasodilation in BAT, with little impact on the rest of the vasculature throughout the body, norepinephrine leads to local vasodilation in addition to peripheral vasoconstriction. As a result, a significantly greater relative increase in BAT perfusion is observed following the injection of NE compared to CL. This study demonstrates the use of in vivo CT angiography as an effective tool in assessing vascular reactivity in BAT both qualitatively and quantitatively in preclinical studies.
(© 2022. The Author(s).)
Databáze: MEDLINE
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