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ISSN: 2155-9619
Journal of Nuclear Medicine & Radiation Therapy
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Nuclear Medicine Contributes to the Identification of Brown Adipose Tissue in Adult Human

Zheng Chen*

Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109-0622, USA

*Corresponding Author:
Zheng chen
Department of Molecular and Integrative Physiology
University of Michigan Medical School Ann Arbor
MI 48109-0622, USA
E-mail: [email protected] or [email protected]

Received date: November 20, 2012; Accepted date: November 23, 2012; Published date: November 28, 2012

Citation: Chen Z (2012) Nuclear Medicine Contributes to the Identification of Brown Adipose Tissue in Adult Human. J Nucl Med Radiat Ther 3:e105. doi: 10.4172/2155-9619.1000e105

Copyright: © 2012 Chen Z. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Introduction

Brown Adipose Tissue (BAT) is present in rodents for whole life, and plays dominant effects on body weight, energy expenditure, lipid and glucose metabolism, providing a good target to cure obesity and diabetes [1]. However, in human, BAT was thought that it only exist in newborn or infant to maintain body temperature, and gradually gone in adults [1]. It is not clear whether BAT is present in adult humans and has physiological relevance because there was no good method to measure the mass or activity of BAT in adult human.

Recent studies in nuclear medicine suggested that the consecutive 18F-fluorodeoxyglucose can be taken up into adipose tissue, and the area with high 18F-FDG uptake putatively represented brown adipose tissue [2-4]. By using 18F-FDG positron-emission tomographic and computed tomographic (PET-CT) scans, three papers published on New England Journal of Medicine clearly showed that brown adipose tissue was present in adult humans [5-7]. Human BAT scattered at a region from the anterior neck to the thorax. Although the positive scan is only 7.5% in women and 3.1% in men under normal condition [5], 96% subjects showed BAT activity during cold exposure [6]. Both immunostaining and gene expression date showed that UCP1, a BAT marker, was expressed in adult human BAT [5-7]. All these data demonstrated that brown adipose tissue was present in adult human.

Next question is whether identified BAT in adult human has physiological relevance. BAT mass and activity can also be measured by 18F-FDG PET-CT scans. The activity was dramatically reduced in the overweight or obese subjects that in the lean subjects [6]. The Body- Mass Index (BMI) and age had strong negative correlations with BAT mass and activity [5,6].

Functional studies of BAT in adult humans indicated that BAT is a good target for the treatment of obesity and diabetes. More and more attention has been paid to the studies of BAT. It is one of the hottest fields in biomedical research. There were 3672 papers published in the last three years since BAT was identified in adult humans. All of these progresses are partly due to technical application of nuclear medicine. Nuclear medicine will continually contribute to the studies of brown adipose tissue in adult humans.

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