Abstract
Objectives:
To investigate the impact of transient (2–4 h) hypoxia on metabolic reprogramming of adipocytes.
Methods:
The impact of transient hypoxia on metabolic reprogramming was investigated in 3T3-L1 cells before and after differentiation. Glucose uptake, fatty acid oxidation, lipolysis and mitochondria were examined to determine the hypoxia effects. Preadipocytes were exposed to transient hypoxia (4 h day−1) in the course of differentiation. Insulin sensitivity and triglyceride (TG) accumulation was examined in the cells at the end of differentiation to determine the reprogramming effects. AMP-activated protein kinase (AMPK) activity and gene expression were determined by quantitative reverse transcriptase-PCR and western blotting in search for mechanism of the reprogramming.
Results:
In acute response to hypoxia, adipocytes exhibited an increase in insulin-dependent and -independent glucose uptake. Fatty acid β-oxidation and pyruvate dehydrogenase activity were decreased. Multiple exposures of differentiating adipocytes to transient hypoxia enhanced insulin signaling, TG accumulation and expression of antioxidant genes in differentiated adipocytes in the absence of hypoxia. The metabolic memory was associated with elevated AMPK activity and gene expression (GLUT1, PGC-1α, PPARγ, SREBP, NRF-1, ESRRα, LPL). The enhanced insulin sensitivity was blocked by an AMPK inhibitor.
Conclusions:
Repeated exposure of differentiating adipocytes to transient hypoxia is able to reprogram the cells for increased TG accumulation and enhanced insulin sensitivity. The metabolic alterations were observed in postdifferentiated cells under normoxia. The reprogramming involves AMPK activation and gene expression in the metabolic pathways in cytosol and mitochondria.
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Acknowledgements
This work was supported by National Institutes of Health grant (DK068036 and DK085495) to JY, National Natural Science Funds for Distinguished Young Scholar of China (81025005) and Changjiang Scholars and Innovative Research Team in University of China (985 project IRT 0947) to JW. The qRT-PCR assay was performed in core facility supported by NIH grant (2P30DK072476). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.
Author contributions
HL, ZG and ZZ performed the experiments. JY and JW designed the study and wrote the manuscript. JY is fully responsible for this article. All authors read and approved the final manuscript.
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Lu, H., Gao, Z., Zhao, Z. et al. Transient hypoxia reprograms differentiating adipocytes for enhanced insulin sensitivity and triglyceride accumulation. Int J Obes 40, 121–128 (2016). https://doi.org/10.1038/ijo.2015.137
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DOI: https://doi.org/10.1038/ijo.2015.137
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