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Flavonoids from Triticum aestivum inhibit adipogenesis in 3T3-L1 cells by upregulating the insig pathway

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The present study aimed to compare the potential anti-adipogenic effects and underlying mechanisms of the luteolin, isoscoparin and isoorientin flavonoids, purified from Triticum aestivum sprout (TA) in 3T3L1 cells. The cells were treated with different concentrations of flavonoids for 8 days and the lipid accumulation was assessed using OilRedO staining. The expression levels of the transcription factors and the genes involved in adipogenesis in the cells were assessed by reverse transcriptionquantitative polymerase chain reaction and western blotting. The results demonstrated that 10 µM luteolin, isoscoparin or isoorientin inhibited lipid deposition in the cells by 74, 63 and 65%, respectively. The flavonoids also significantly inhibited the transcriptional regulators of adipogenesis, including peroxisome proliferatoractivated receptorγ, CAAT/enhancer binding proteinα and sterol regulatory element binding protein (SREBP)1c, compared with the control cells. Similarly, there was a significant downregulation of the adipocyte specific markers associated with lipid metabolism, including activating protein2, fatty acid synthase, hormonesensitive lipase and lipoprotein lipase, in the flavonoid treated cells. Notably, the cells treated with the flavonoids demonstrated increased expression levels of the insulininduced genes, insig1 and insig2, which may have inhibited the activation of the adipogenic transcription factor, SREBP, eventually leading to the inhibition of adipogenesis. Taken together, these results revealed that the flavonoids from TA possessed an inhibitory effect on adipogenesis through downregulation of adipogenic transcription factors and genes associated with lipid metabolism, and the upregulation of insig 1 and 2, suggesting that the flavonoids from TA may be potential therapeutic agents for the prevention and treatment of obesity.
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Document Type: Research Article

Affiliations: 1: Department of Oriental Pharmacy, College of Pharmacy and WonkwangOriental Medicines Research Institute, Wonkwang University, Iksan, Jeonbuk 570749, Republic of Korea 2: Department of Immunology and Institute of Medical Sciences, Medical School, Chonbuk National University, Jeonju, Jeonbuk 561756, Republic of Korea 3: Department of Pharmacognosy, College of Pharmacy, Chungnam National University, Daejeon 305764, Republic of Korea

Publication date: August 1, 2015

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  • Molecular Medicine Reports is a monthly, peer-reviewed journal available in print and online, that includes studies devoted to molecular medicine, underscoring aspects including pharmacology, pathology, genetics, neurosciences, infectious diseases, molecular cardiology and molecular surgery. In vitro and in vivo studies of experimental model systems pertaining to the mechanisms of a variety of diseases offer researchers the necessary tools and knowledge with which to aid the diagnosis and treatment of human diseases.
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