Abstract
In this work human bone marrow mesenchymal stem cells (hMSCs) have been differentiated into brown adipocytes by the bone morphogenic protein BMP7, and the morphological and biochemical changes of hMSCs occurring during the differentiation towards brown adipocytes have been investigated. After differentiation, the cells display the presence of numerous vacuoles full of lipids; staining with Oil Red reveals the typical multilocular organization of fat, and a compact network of actin microfilaments surrounding fat vacuoles appears. Uncoupling protein 1 (UCP1), a mitochondrial protein characteristic of the brown adipose tissue, only visible by Western blotting in hMSCs, exhibits a marked increase after the second cycle of adipogenic induction and even more after the fourth cycle, while the mitochondria change their localization from scattered throughout the cytoplasm to mainly near the fat vacuoles. In differentiated brown adipocytes mitochondria close to the vacuoles display a low membrane potential most likely due to the abundant presence of UCP1. Hopefully the additional knowledge about the role of UCP1 in hMSCs and brown adipocytes will be useful in developing strategies for the treatment of several diseases, such as obesity and type 2 diabetes.
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Abbreviations
- ANOVA:
-
Analysis of variance
- β-AR:
-
β-adrenergic receptors
- BAT:
-
Brown adipose tissue
- BMP:
-
Bone morphogenic protein
- BSA:
-
Bovine serum albumin
- CLSM:
-
Confocal laser scanning microscope
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- EDTA:
-
Ethylenediaminetetraacetic acid
- EMS:
-
Electron microscopy sciences
- FBS:
-
Fetal bovine serum
- FESEM:
-
Field emission scanning electron microscope
- FITC:
-
Fluorescein isothiocyanate
- hMSCs:
-
Human mesenchymal stem cells
- MEM:
-
Minimum essential medium
- MSCs:
-
Mesenchymal stromal cells
- PBS:
-
Phosphate buffered saline
- S.E.M.:
-
Standard error of mean
- SDS-PAGE:
-
Sodium dodecyl sulphate-polyAcrylamide gel electrophoresis
- SEM:
-
Scanning electron microscope
- TGF-β:
-
Transforming growth factor β
- UCP1:
-
Uncoupling protein 1
- WAT:
-
White adipocyte tissue
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Cambria, M.T., Villaggio, G., Federico, C. et al. Bone morphogenic protein BMP7 induces adipocyte differentiation and uncoupling protein UCP1 expression in human bone marrow mesenchymal stem cells. Rend. Fis. Acc. Lincei 28, 635–641 (2017). https://doi.org/10.1007/s12210-017-0643-x
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DOI: https://doi.org/10.1007/s12210-017-0643-x