Evaluation of Maternal, Embryo, and Placental Effects in CD-1 Mice following Gestational Exposure to Perfluorooctanoic Acid (PFOA) or Hexafluoropropylene Oxide Dimer Acid (HFPO-DA or GenX)
Autor: | Suzanne E. Fenton, Robert D. Keys, Brittany Scott, James McCord, Heather M. Stapleton, Harlie A. Cope, Beth W. Mahler, Mark J. Strynar, Samantha M. Hall, Bevin E. Blake, Susan A. Elmore |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
medicine.medical_specialty
Gestational exposure Hydrocarbons Fluorinated Health Toxicology and Mutagenesis Placenta 010501 environmental sciences 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Pregnancy Internal medicine Toxicity Tests medicine Animals 030212 general & internal medicine Pregnancy outcomes Neprilysin 0105 earth and related environmental sciences 2. Zero hunger Fluorocarbons Extramural Chemistry Research Public Health Environmental and Occupational Health Dimer acid Hexafluoropropylene oxide Embryo 3. Good health Endocrinology Perfluorooctanoic acid Female Caprylates |
Zdroj: | Environmental Health Perspectives |
ISSN: | 1552-9924 0091-6765 |
Popis: | Background: Perfluorooctanoic acid (PFOA) is a poly- and perfluoroalkyl substance (PFAS) associated with adverse pregnancy outcomes in mice and humans, but little is known regarding one of its replacements, hexafluoropropylene oxide dimer acid (HFPO-DA, referred to here as GenX), both of which have been reported as contaminants in drinking water. Objectives: We compared the toxicity of PFOA and GenX in pregnant mice and their developing embryo–placenta units, with a specific focus on the placenta as a hypothesized target. Methods: Pregnant CD-1 mice were exposed daily to PFOA (0, 1, or 5mg/kg) or GenX (0, 2, or 10mg/kg) via oral gavage from embryonic day (E) 1.5 to 11.5 or 17.5 to evaluate exposure effects on the dam and embryo–placenta unit. Gestational weight gain (GWG), maternal clinical chemistry, maternal liver histopathology, placental histopathology, embryo weight, placental weight, internal chemical dosimetry, and placental thyroid hormone levels were determined. Results: Exposure to GenX or PFOA resulted in increased GWG, with increase in weight most prominent and of shortest latency with 10mg/kg/d GenX exposure. Embryo weight was significantly lower after exposure to 5mg/kg/d PFOA (9.4% decrease relative to controls). Effect sizes were similar for higher doses (5mg/kg/d PFOA and 10mg/kg/d GenX) and lower doses (1mg/kg/d PFOA and 2mg/kg/d GenX), including higher maternal liver weights, changes in liver histopathology, higher placental weights and embryo–placenta weight ratios, and greater incidence of placental abnormalities relative to controls. Histopathological features in placentas suggested that PFOA and GenX may exhibit divergent mechanisms of toxicity in the embryo–placenta unit, whereas PFOA- and GenX-exposed livers shared a similar constellation of adverse pathological features. Conclusions: Gestational exposure to GenX recapitulated many documented effects of PFOA in CD-1 mice, regardless of its much shorter reported half-life; however, adverse effects toward the placenta appear to have compound-specific signatures. https://doi.org/10.1289/EHP6233 |
Databáze: | OpenAIRE |
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