Peroxisome proliferator-activated receptor gamma-mediated regulation of neural stem cell proliferation and differentiation - PubMed (original) (raw)
. 2006 May 5;281(18):12673-81.
doi: 10.1074/jbc.M513786200. Epub 2006 Mar 8.
Atsushi Nakajima, Kazufumi Katayama, Chiho Kudo, Atsuhito Shibuya, Naoto Kubota, Yasuo Terauchi, Masashi Tachibana, Hiroyuki Miyoshi, Yoshinori Kamisaki, Tadanori Mayumi, Takashi Kadowaki, Richard S Blumberg
Affiliations
- PMID: 16524877
- DOI: 10.1074/jbc.M513786200
Peroxisome proliferator-activated receptor gamma-mediated regulation of neural stem cell proliferation and differentiation
Koichiro Wada et al. J Biol Chem. 2006.
Abstract
Peroxisome proliferator-activated receptor gamma (PPARgamma) plays an important role in insulin sensitivity, tissue homeostasis, and regulating cellular functions. We found high-level expression of PPARgamma in embryo mouse brain and neural stem cells (NSCs), in contrast to extremely low levels in adult mouse brain. Here, we show that PPARgamma mediates the proliferation and differentiation of murine NSCs via up-regulation of the epidermal growth factor receptor and activation of the ERK pathway. Cell growth rates of NSCs prepared from heterozygous PPARgamma-deficient mouse brains, PPARgamma-RNA-silenced NSCs, and PPARgamma dominant-negative NSCs were significantly decreased compared with those of wild-type NSCs. Physiological concentrations of PPARgamma agonists, rosiglitazone and pioglitazone, stimulated NSC growth, whereas antagonists caused cell death in a concentration-dependent manner via activation of the caspase cascade. The stimulation of cell growth by PPARgamma was associated with a rapid activation of the ERK pathway by phosphorylation and up-regulation of epidermal growth factor receptor and cyclin B protein levels. In contrast, activation of PPARgamma by agonists inhibited the differentiation of NSCs into neurons. The inhibition of differentiation was associated with an activation of STAT3. These data indicate that PPARgamma regulates the development of the central nervous system during early embryogenesis via control of NSC proliferation.
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