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Fatty acid binding protein 4 expression marks a population of adipocyte progenitors in white and brown adipose tissues

Fatty acid binding protein 4 expression marks a population of adipocyte progenitors in white and... Adipose tissues regulate metabolism, reproduction, and life span. The development and growth of adipose tissue are due to increases of both adipocyte cell size and cell number; the latter is mediated by adipocyte progenitors. Various markers have been used to identify either adipocyte progenitors or mature adipocytes. The fatty acid binding protein 4 (FABP4), commonly known as adipocyte protein 2 (aP2), has been extensively used as a marker for differentiated adipocytes. However, whether aP2 is expressed in adipogenic progenitors is controversial. Using Cre/LoxP‐based cell lineage tracing in mice, we have identified a population of aP2‐expressing progenitors in the stromal vascular fraction (SVF) of both white and brown adipose tissues. The aP2‐lineage progenitors reside in the adipose stem cell niche and express adipocyte progenitor markers, including CD34, Sca1, Dlk1, and PDGFRα. When isolated and grown in culture, the aP2‐expressing SVF cells proliferate and differentiate into adipocytes upon induction. Conversely, ablation of the aP2 lineage greatly reduces the adipogenic potential of SVF cells. When grafted into wild‐type mice, the aP2‐lineage progenitors give rise to adipose depots in recipient mice. Therefore, the expression of aP2 is not limited to mature adipocytes, but also marks a pool of undifferentiated progenitors associated with the vasculature of adipose tissues. Our finding adds to the repertoire of adipose progenitor markers and points to a new regulator of adipose plasticity.—Shan, T., Liu, W., Kuang, S. Fatty acid‐binding protein 4 expression marks a population of adipocyte progenitors in white and brown adipose tissues. FASEB J. 27, 277–287 (2013). www.fasebj.org http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The FASEB journal Wiley

Fatty acid binding protein 4 expression marks a population of adipocyte progenitors in white and brown adipose tissues

The FASEB journal , Volume 27 (1) – Jan 1, 2013

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References (40)

Publisher
Wiley
Copyright
© Federation of American Societies for Experimental Biology
ISSN
0892-6638
eISSN
1530-6860
DOI
10.1096/fj.12-211516
Publisher site
See Article on Publisher Site

Abstract

Adipose tissues regulate metabolism, reproduction, and life span. The development and growth of adipose tissue are due to increases of both adipocyte cell size and cell number; the latter is mediated by adipocyte progenitors. Various markers have been used to identify either adipocyte progenitors or mature adipocytes. The fatty acid binding protein 4 (FABP4), commonly known as adipocyte protein 2 (aP2), has been extensively used as a marker for differentiated adipocytes. However, whether aP2 is expressed in adipogenic progenitors is controversial. Using Cre/LoxP‐based cell lineage tracing in mice, we have identified a population of aP2‐expressing progenitors in the stromal vascular fraction (SVF) of both white and brown adipose tissues. The aP2‐lineage progenitors reside in the adipose stem cell niche and express adipocyte progenitor markers, including CD34, Sca1, Dlk1, and PDGFRα. When isolated and grown in culture, the aP2‐expressing SVF cells proliferate and differentiate into adipocytes upon induction. Conversely, ablation of the aP2 lineage greatly reduces the adipogenic potential of SVF cells. When grafted into wild‐type mice, the aP2‐lineage progenitors give rise to adipose depots in recipient mice. Therefore, the expression of aP2 is not limited to mature adipocytes, but also marks a pool of undifferentiated progenitors associated with the vasculature of adipose tissues. Our finding adds to the repertoire of adipose progenitor markers and points to a new regulator of adipose plasticity.—Shan, T., Liu, W., Kuang, S. Fatty acid‐binding protein 4 expression marks a population of adipocyte progenitors in white and brown adipose tissues. FASEB J. 27, 277–287 (2013). www.fasebj.org

Journal

The FASEB journalWiley

Published: Jan 1, 2013

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