Volume 11, Issue 12 e201800135
FULL ARTICLE

Quantitative in vivo detection of adipose tissue browning using diffuse reflectance spectroscopy in near-infrared II window

Kapil Dev

Kapil Dev

Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore

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U. S Dinish

U. S Dinish

Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore

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Smarajit Chakraborty

Smarajit Chakraborty

Fat Metabolism and Stem Cell Group, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore

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Renzhe Bi

Renzhe Bi

Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore

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Stefan Andersson-Engels

Stefan Andersson-Engels

Irish Photonic Integration Centre (IPIC), Tyndall National Institute, Cork, Ireland

Department of Physics, University College Cork, Cork, Ireland

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Shigeki Sugii

Shigeki Sugii

Fat Metabolism and Stem Cell Group, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore

Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore

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Malini Olivo

Corresponding Author

Malini Olivo

Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore

Correspondence

Malini Olivo, Laboratory of Bio Optical Imaging, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (A*STAR), Singapore.

Email: [email protected]

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First published: 05 July 2018
Citations: 11
Kapil Dev and U. S Dinish contributed equally to this study.

Abstract

White adipose tissue (WAT) and brown adipose tissue (BAT) biologically function in an opposite way in energy metabolism. BAT induces energy consumption by heat production while WAT mainly stores energy in the form of triglycerides. Recent progress in the conversion of WAT cells to “beige” or “brown-like” adipocytes in animals, having functional similarity to BAT, spurred a great interest in developing the next-generation therapeutics in the field of metabolic disorders. Though magnetic resonance imaging and positron emission tomography could detect classical BAT and WAT in animals and humans, it is of a great challenge in detecting the “browning” process in vivo. Here, to the best of our knowledge, for the first time, we present a simple, cost-effective, label-free fiber optic-based diffuse reflectance spectroscopy measurement in the near infrared II window (~1050-1400 nm) for the quantitative detection of browning in a mouse model in vivo. We could successfully quantify the browning of WAT in a mouse model by estimating the lipid fraction, which serves as an endogenous marker. Lipid fraction exhibited a gradual decrease from WAT to BAT with beige exhibiting an intermediate value. in vivo browning process was also confirmed with standard molecular and biochemical assays.

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