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Toxicol In Vitro. 2017 Mar;39:75-83. doi: 10.1016/j.tiv.2016.11.016. Epub 2016 Dec 5.

The plasticizer BBP selectively inhibits epigenetic regulator sirtuin during differentiation of C3H10T1/2 stem cell line.

Author information

1
Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M Health Science Center, Kingsville, TX, USA.
2
Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M Health Science Center, Kingsville, TX, USA. Electronic address: mchoudhury@pharmacy.tamhsc.edu.

Abstract

Exposure to environmental chemicals can perturb an individual's metabolic set point, especially during critical periods of development, and as a result increase his or her propensity towards obesity that is manifested later in life and possibly in successive generations. We hypothesized that benzyl butyl phthalate (BBP), a widespread endocrine disruptor, may impair one important epigenetic regulator, sirtuin, in mesenchymal stem cells and induce adipogenesis. Our results showed that gene expression of two well-known adipogenic markers, aP2 and PPARγ, were significantly increased from day 2 to day 8 under 50μM BBP exposure when compared to control in C3H10T1/2 stem cells (p<0.05) and induced adipogenesis. Sirt1 gene expression was also significantly decreased at day 2, 4, 6, and 8 (p<0.05). However, Sirt7 gene expression was decreased only at day 2 and 8 (p<0.05) while other sirtuin transcriptional levels remained unaltered throughout. Furthermore, Sirt1 and Sirt3 protein expression was decreased (p<0.05) and overall protein hyperacetylation was observed at day 8. Furthermore, FOXO1 and β-catenin, Sirt1 targets and adipogenesis regulators, were hyperacetylated at day 8. PGC1α, NRF1, NRF2, and Tfam, were also significantly decreased (p<0.05). In conclusion, our study suggests for the first time that BBP, a potential epigenetic disruptor, can lead to increased adipogenesis and metabolic dysregulation by impairing vital epigenetic regulators.

KEYWORDS:

Adipogenesis; Benzyl butyl phthalate (BBP); Endocrine disruptor; Hyperacetylation; Mesenchymal stem cell; Sirtuins

PMID:
27923775
DOI:
10.1016/j.tiv.2016.11.016
[Indexed for MEDLINE]

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