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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Keipert, Susanne Jastroch, Martin |
| Description | Author Affiliation: Keipert S ( Institute for Diabetes and Obesity, Helmholtz-Zentrum München, German Research Center for Environmental Health (GmbH), Parkring 13, 85748 Garching, Germany.); Jastroch M ( Institute for Diabetes and Obesity, Helmholtz-Zentrum München, German Research Center for Environmental Health (GmbH), Parkring 13, 85748 Garching, Germany. Electronic address: martin.jastroch@helmholtz-muenchen.de.) |
| Abstract | The presence of two distinct types of adipose tissue, which have opposing functions, has been known for decades. White adipose tissue (WAT) is the main tissue of energy storage, while brown adipose tissue (BAT) dissipates energy as heat and is required for non-shivering thermoregulation. In the last few years, a third type of adipocyte was identified, termed the brite (“brown and white”) or beige adipocyte. Their physiological control and role, however, are not fully clarified. Brite/beige adipocytes have a positive impact on systemic metabolism that is generally explained by the thermogenesis of brite/beige adipocytes; although thermogenesis has not been directly measured but is mostly inferred by gene expression data of typical thermogenic genes such as uncoupling protein 1 (UCP1). Here we critically review functional evidence for the thermogenic potential of brite/beige adipocytes, leading to the conclusion that direct measurements of brite/beige adipocyte bioenergetics, beyond gene regulation, are pivotal to quantify their thermogenic potential. In particular, we exemplified that the massive induction of UCP1 mRNA during the browning of isolated subcutaneous adipocytes in vitro is not reflected in significant alterations of cellular bioenergetics. Herein, we demonstrate that increases in mitochondrial respiration in response to beta-adrenergic stimulus can be independent of UCP1. Using HEK293 cells expressing UCP1, we show how to directly assess UCP1 function by adequate activation in intact cells. Finally, we provide a guide on the interpretation of UCP1 activity and the pitfalls by solely using respiration measurements. The functional analysis of beige adipocyte bioenergetics will assist to delineate the impact of browning on thermogenesis, possibly elucidating additional physiological roles and its contribution to systemic metabolism, highlighting possible avenues for future research. This article is part of a Special Issue entitled: 18th European Bioenergetic Conference. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 7 |
| Volume Number | 1837 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-07-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Adipose Tissue Metabolism Ion Channels Mitochondrial Proteins Thermogenesis Adipocytes Drug Effects Physiology Animals Cell Respiration Cells, Cultured HEK293 Cells Genetics Mice Mice, Inbred C57BL Mitochondria RNA, Messenger Thiazolidinediones Pharmacology Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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