Abstract
Polycyclic aromatic hydrocarbons (PAHs) are toxic chemicals released into the environment by fossil fuel combustion. Moreover, a primary route of human exposure to PAHs is tobacco smoke1,2. Oocyte destruction and ovarian failure occur in PAH-treated mice1,2, and cigarette smoking causes early menopause in women1,3. In many cells, PAHs activate the aromatic hydrocarbon receptor (Ahr), a member of the Per-Arnt-Sim family of transcription factors4,5. The Ahr is also activated by dioxin, one of the most intensively studied environmental contaminants. Here we show that an exposure of mice to PAHs induces the expression of Bax in oocytes6, followed by apoptosis. Ovarian damage caused by PAHs is prevented by Ahr or Bax inactivation. Oocytes microinjected with a Bax promoter–reporter construct show Ahr-dependent transcriptional activation after PAH, but not dioxin, treatment, consistent with findings that dioxin is not cytotoxic to oocytes. This difference in the action of PAHs versus dioxin is conveyed by a single base pair flanking each Ahr response element in the Bax promoter. Oocytes in human ovarian biopsies grafted into immunodeficient mice also accumulate Bax and undergo apoptosis after PAH exposure in vivo. Thus, Ahr-driven Bax transcription is a novel and evolutionarily conserved cell-death signaling pathway responsible for environmental toxicant-induced ovarian failure.
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Acknowledgements
We thank K.I. Tilly, X.-J. Tao and T. Manganaro for technical help, S. Riley for assistance with the image analysis, and I. Schiff for critical reading of the manuscript. This study was supported by the National Institutes of Health (R01-ES08430), the Canadian Toxic Substances Research Initiative, the Harvard Center of Excellence in Women's Health, and Vincent Memorial Research Funds. We conducted this work while T.M. and J.L. were Research Fellows supported by the Finnish Foundation for Pediatric Research and the Finnish Cultural Foundation, A.J. was a Research Fellow supported by the Canadian Institutes of Health Research, and J.K.P. was a Research Fellow supported by the Lalor Foundation.
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Matikainen, T., Perez, G., Jurisicova, A. et al. Aromatic hydrocarbon receptor-driven Bax gene expression is required for premature ovarian failure caused by biohazardous environmental chemicals. Nat Genet 28, 355–360 (2001). https://doi.org/10.1038/ng575
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DOI: https://doi.org/10.1038/ng575
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