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JCI Insight. 2016 Aug 18;1(13):e87146. doi: 10.1172/jci.insight.87146.

Thermogenic profiling using magnetic resonance imaging of dermal and other adipose tissues.

Author information

1
McArdle Laboratory for Cancer Research.
2
Department of Radiology.
3
Department of Mechanical Engineering.
4
Department of Medical Physics.
5
Department of Biomedical Engineering.
6
Department of Medicine, and.
7
Department of Emergency Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Abstract

Dermal white adipose tissue (dWAT) was recently recognized for its potential to modify whole body metabolism. Here, we show that dWAT can be quantified using a high-resolution, fat-specific magnetic resonance imaging (MRI) technique. Noninvasive MRI has been used to describe adipocyte depots for many years; the MRI technique we describe uses an advanced fat-specific method to measure the thickness of dWAT, together with the total volume of WAT and the relative activation/fat depletion of brown adipose tissues (BAT). Since skin-embedded adipocytes may provide natural insulation, they provide an important counterpoint to the activation of thermogenic brown and beige adipose tissues, whereby these distinct depots are functionally interrelated and require simultaneous assay. This method was validated using characterized mouse cohorts of a lipodystrophic, dWAT-deficient strain (syndecan-1 KO) and 2 obese models (diet-induced obese mice and genetically obese animals, ob/ob). Using a preliminary cohort of normal human subjects, we found the thickness of skin-associated fat varied 8-fold, from 0.13-1.10 cm; on average, this depot is calculated to weigh 8.8 kg.

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