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Adrenergically-stimulated blood flow in brown adipose tissue is not dependent on thermogenesis : Regulation of brown adipose tissue blood flow

Abreu-Vieira, Gustavo, 1987- (author)
Stockholms universitet,Institutionen för molekylär biovetenskap, Wenner-Grens institut
Hagberg, Carolina E. (author)
Spalding, Kirsty L. (author)
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Cannon, Barbara (author)
Stockholms universitet,Institutionen för molekylär biovetenskap, Wenner-Grens institut
Nedergaard, Jan (author)
Stockholms universitet,Institutionen för molekylär biovetenskap, Wenner-Grens institut
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 (creator_code:org_t)
American Physiological Society, 2015
2015
English.
In: American Journal of Physiology. Endocrinology and Metabolism. - : American Physiological Society. - 0193-1849 .- 1522-1555. ; 308:9, s. E822-E829
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Brown adipose tissue (BAT) thermogenesis relies on blood flow to be supplied with nutrients and oxygen, and for the distribution of the generated heat to the rest of the body. It is therefore fundamental to understand the mechanisms by which blood flow is regulated and its relation to thermogenesis. Here we present high-resolution laser-Doppler imaging (HR-LDR) as a novel method for noninvasive, in vivo measurement of BAT blood flow in mice. Using HR-LDR, we found that norepinephrine stimulation increases BAT blood flow in a dose-dependent manner, and that this response is profoundly modulated by environmental temperature acclimation. Surprisingly, we found that mice lacking uncoupling protein 1 (UCP1) have fully preserved BAT blood flow response to norepinephrine, despite failing to perform thermogenesis. BAT blood flow was not directly correlated to systemic glycaemia, but glucose injections could transiently increase tissue perfusion. Inguinal white adipose tissue, also known as a brite/beige adipose tissue, was also sensitive to cold acclimation and similarly increased blood flow in response to norepinephrine. In conclusion, using a novel non-invasive method to detect BAT perfusion, we demonstrate that adrenergically-stimulated BAT blood flow is qualitatively and quantitatively fully independent of thermogenesis, and is therefore not a reliable parameter for the estimation of BAT activation and heat generation.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Keyword

blood flow
brown adipose tissue
high-resolution laser-Doppler imaging
thermogenesis
uncoupling protein 1
fysiologi
Physiology

Publication and Content Type

ref (subject category)
art (subject category)

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