Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 12, Issue 11, Pages 7554-7568Publisher
MDPI
DOI: 10.3390/ijms12117554
Keywords
induced pluripotent stem cell; c-Myc; peroxisome proliferator-activated receptor gamma coactivator-1 alpha; brown adipocyte
Funding
- National Science Council [NSC99-2314-B-075-005-MY3/98-2314-B-075-032-MY3]
- Taipei Veterans General Hospital [98-C1-099/E1-003/ER3-001]
- Yuan-Shan Veteran Hospital [YSVH-9902]
- VGHUST [98-G6-6, 98-P1-01]
- Yen-Tjing-Ling Medical Foundation
- National Yang-Ming University, Ministry of Education, Aim, Taiwan
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Induced pluripotent stem cells formed by the introduction of only three factors, Oct4/Sox2/Klf4 (3-gene iPSCs), may provide a safer option for stem cell-based therapy than iPSCs conventionally introduced with four-gene iPSCs. Peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1 alpha) plays an important role during brown fat development. However, the potential roles of PGC-1 alpha in regulating mitochondrial biogenesis and the differentiation of iPSCs are still unclear. Here, we investigated the effects of adenovirus-mediated PGC-1 alpha overexpression in 3-gene iPSCs. PGC-1 alpha overexpression resulted in increased mitochondrial mass, reactive oxygen species production, and oxygen consumption. Microarray-based bioinformatics showed that the gene expression pattern of PGC-1 alpha-overexpressing 3-gene iPSCs resembled the expression pattern observed in adipocytes. Furthermore, PGC-1 alpha overexpression enhanced adipogenic differentiation and the expression of several brown fat markers, including uncoupling protein-1, cytochrome C, and nuclear respiratory factor-1, whereas it inhibited the expression of the white fat marker uncoupling protein-2. Furthermore, PGC-1 alpha overexpression significantly suppressed osteogenic differentiation. These data demonstrate that PGC-1 alpha directs the differentiation of 3-gene iPSCs into adipocyte-like cells with features of brown fat cells. This may provide a therapeutic strategy for the treatment of mitochondrial disorders and obesity.
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