Hypoxia induces adipocyte differentiation of adipose‐derived stem cells by triggering reactive oxygen species generation

Hypoxia induces adipocyte differentiation of adipose‐derived stem cells by triggering reactive... Generation of reactive oxygen species (ROS) by NADPH oxidase 4 (Nox4) induces the proliferation and migration of adipose‐derived stem cells (ASCs). However, the functional role of mitochondrial ROS (mtROS) generation in ASCs is unknown. Therefore, we have investigated whether hypoxia induces the differentiation of ASCs via ROS generation. We also have tried to identify the cellular mechanisms of ROS generation underlying adipocyte differentiation. Hypoxia (2%) and ROS generators, such as antimycin and rotenone, induced adipocyte differentiation, which was attenuated by an ROS scavenger. Although Nox4 generates ROS and regulates proliferation of ASCs, Nox4 inhibition or Nox4 silencing did not inhibit adipocyte differentiation; indeed fluorescence intensity of mito‐SOX increased in hypoxia, and treatment with mito‐CP, a mtROS scavenger, significantly reduced hypoxia‐induced adipocyte differentiation. Phosphorylation of Akt and mTOR was induced by hypoxia, while inhibition of these molecules prevented adipocyte differentiation. Thus hypoxia induces adipocyte differentiation by mtROS generation, and the PI3K/Akt/mTOR pathway is involved. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cell Biology International Wiley

Hypoxia induces adipocyte differentiation of adipose‐derived stem cells by triggering reactive oxygen species generation

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Publisher
Wiley
Copyright
"© 2013 International Federation for Cell Biology"
ISSN
1065-6995
eISSN
1095-8355
DOI
10.1002/cbin.10170
Publisher site
See Article on Publisher Site

Abstract

Generation of reactive oxygen species (ROS) by NADPH oxidase 4 (Nox4) induces the proliferation and migration of adipose‐derived stem cells (ASCs). However, the functional role of mitochondrial ROS (mtROS) generation in ASCs is unknown. Therefore, we have investigated whether hypoxia induces the differentiation of ASCs via ROS generation. We also have tried to identify the cellular mechanisms of ROS generation underlying adipocyte differentiation. Hypoxia (2%) and ROS generators, such as antimycin and rotenone, induced adipocyte differentiation, which was attenuated by an ROS scavenger. Although Nox4 generates ROS and regulates proliferation of ASCs, Nox4 inhibition or Nox4 silencing did not inhibit adipocyte differentiation; indeed fluorescence intensity of mito‐SOX increased in hypoxia, and treatment with mito‐CP, a mtROS scavenger, significantly reduced hypoxia‐induced adipocyte differentiation. Phosphorylation of Akt and mTOR was induced by hypoxia, while inhibition of these molecules prevented adipocyte differentiation. Thus hypoxia induces adipocyte differentiation by mtROS generation, and the PI3K/Akt/mTOR pathway is involved.

Journal

Cell Biology InternationalWiley

Published: Jan 1, 2014

Keywords: ; ; ; ;

References

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