Abstract
We previously reported that curcumin induces browning of primary white adipocytes via enhanced expression of brown adipocyte-specific genes. In this study, we attempted to identify target proteins responsible for this fat-browning effect by analyzing proteomic changes in cultured white adipocytes in response to curcumin treatment. To elucidate the role of curcumin in fat-browning, we conducted comparative proteomic analysis of primary adipocytes between control and curcumin-treated cells using two-dimensional electrophoresis combined with MALDI-TOF-MS. We also investigated fatty acid metabolic targets, mitochondrial biogenesis, and fat-browning-associated proteins using combined proteomic and network analyses. Proteomic analysis revealed that 58 protein spots from a total of 325 matched spots showed differential expression between control and curcumin-treated adipocytes. Using network analysis, most of the identified proteins were proven to be involved in various metabolic and cellular processes based on the PANTHER classification system. One of the most striking findings is that hormone-sensitive lipase (HSL) was highly correlated with main browning markers based on the STRING database. HSL and two browning markers (UCP1, PGC-1α) were co-immunoprecipitated with these markers, suggesting that HSL possibly plays a role in fat-browning of white adipocytes. Our results suggest that curcumin increased HSL levels and other browning-specific markers, suggesting its possible role in augmentation of lipolysis and suppression of lipogenesis by trans-differentiation from white adipocytes into brown adipocytes (beige).
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Abbreviations
- 2-DE:
-
Two-dimensional electrophoresis
- ANXA2:
-
Annexin A2
- AMPK:
-
AMP-activated protein kinase
- ATP5B:
-
ATP synthase subunit beta, mitochondrial
- CA3:
-
Carbonic anhydrase 3
- CS:
-
Citrate synthase
- C/EBP/Cebp :
-
CCAAT/enhancer-binding protein/encoding gene
- FABP4:
-
Fatty acid binding protein 4
- HADH:
-
Trifunctional enzyme subunit alpha
- HSL:
-
Hormone-sensitive lipase
- HSP90:
-
Heat shock protein 90 kDa
- PGC-1α:
-
Peroxisome proliferator-activated receptor gamma co-activator 1-alpha
- MDH:
-
Malate dehydrogenase
- PPAR:
-
Peroxisome proliferator-activated receptor
- PRDM16/Prdm16 :
-
PR domain-containing 16/encoding gene
- UCP/Ucp :
-
Uncoupling protein/encoding gene
- WAT:
-
White adipose tissue
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Acknowledgments
This work was supported by the Mid-career Researcher Program (2013R1A2A2A05004195) and SRC Program (Center for Food & Nutritional Genomics, Grant number 2015R1A5A6001906) through a NRF Grant funded by the Ministry of Science, ICT and Future Planning, Korea.
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Kim, S.W., Choi, J.H., Mukherjee, R. et al. Proteomic identification of fat-browning markers in cultured white adipocytes treated with curcumin. Mol Cell Biochem 415, 51–66 (2016). https://doi.org/10.1007/s11010-016-2676-3
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DOI: https://doi.org/10.1007/s11010-016-2676-3