Abstract
In this study, cells from the stromal vascular fraction of human subcutaneous tissues were induced to differentiate toward adipose cells in vitro for 2 weeks. During adipogenic differentiation, we followed the chronological changes in their morphology with Coherent anti-Stokes Raman scattering (CARS) microscopy and checked the PPAR-γ and UCP-1 expression with RT-PCR. On day 4 after inducing adipogenic differentiation, CARS imaging showed multiple small lipid droplets (LD) distributed peripherally along the cellular membrane. PPAR-γ began to express at this time and increased until day 14 at a steady rate. On day 7, the cells appeared as brown adipocytes with numerous small LD throughout the cytoplasm, and the mRNA level of UCP-1 rose abruptly by 6- to 7-fold. After an additional 7 days, CARS imaging showed the development of a large LD, which is characteristic of white adipocytes, and the mRNA level of UCP-1 slumped significantly. These results demonstrate the possibility that ADSC pass through a brown adipocyte-like stage while differentiating into white adipocytes.
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Abbreviations
- ADSC:
-
Adipose-derived stem cell
- BAT:
-
Brown adipose tissue
- CARS:
-
Coherent anti-Stokes Raman scattering
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- FBS:
-
Fetal bovine serum
- IBMX:
-
Isobutyl-methylxanthine
- LD:
-
Lipid droplet
- PBS:
-
Phosphate-buffered saline
- PPAR-γ:
-
Peroxisome proliferator-activated receptor-γ
- SVF:
-
Stromal vascular fraction
- UCP-1:
-
Mitochondria-uncoupling protein-1
- WAT:
-
White adipose tissue
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Acknowledgments
This work was supported by the Next-Generation New-Technology Development Program of MKE, and by the Bio-signal Analysis Technology Innovation Program (No. 2009-0084137) and the National Research Foundation of Korea grant (No. 2009-0092835) of MEST, Republic of Korea.
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Jo, S.J., Choi, W.W., Lee, E.S. et al. Temporary Increase of PPAR-γ and Transient Expression of UCP-1 in Stromal Vascular Fraction Isolated Human Adipocyte Derived Stem Cells During Adipogenesis. Lipids 46, 487–494 (2011). https://doi.org/10.1007/s11745-011-3525-5
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DOI: https://doi.org/10.1007/s11745-011-3525-5