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• W1992270086 abstract "The industrial solvent 2-methoxyethanol (2ME) is a reproductive and developmental toxicant when administered by inhalation, gavage, and IP injection. The present research established that this solvent can produce teratogenicity in rats when administered in liquid diet. Groups of 10 Sprague-Dawley rats were given various percentages of 2ME in liquid diet on gestation days 7-18. Day 20 fetuses were examined for visceral or skeletal malformations. Concentrations above 0.025% 2ME (approximately 73 mg/kg/day) produced total embryo-mortality. Cardiovascular malformations were produced at lower levels. The teratogenic no-effect level was 0.006% 2ME (16 mg/kg). In a second experiment, groups of 12 Sprague-Dawley rats were given 0, 0.006 and 0.012% of 2ME as above. Litters were culled to 8 pups, and tested for auditory and tactile startle and conditioned lick suppression, and for performance in figure-8 activity and the Cincinnati water maze on postnatal days 48-65. The high dose of 2ME produced approximately 50% mortality in the offspring and increased the number of errors in the Cincinnati maze. No other behavioral effects were observed at either dose. An interaction study was conducted to determine if simultaneous exposure to 2ME and ethanol would reduce the teratogenicity of 2ME, but no reduction was observed. The hypothesis that 2ME acts by altering embryonic intracellular pH was tested by injecting 0.33 ml/kg of 2ME into rats on gestation day 13, and determining embryonic intracellular pH at 2, 4, 8, and 24 hours thereafter. There was an increase in pH at 4 hours, but not at later time points. Another group of rats was given 2ME along with amiloride, which blocks the sodium/hydrogen antiporter. The combined 2ME-amiloride exposure produced an incidence of cardiovascular malformations in fetuses twice that of 2ME alone. These studies confirmed the structural teratogenicity of 2ME even when given in liquid diet, as it was given for the first time in the present study. At nonteratogenic doses, developmental toxicity (e.g., postnatal deaths) persisted, but only limited evidence of behavioral teratogenicity was observed. The pH data are consistent with the concept that 2ME may alter embryonic intracellular pH at critical stages of organogenesis." @default.
• W1992270086 created "2016-06-24" @default.
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• W1992270086 date "1989-05-01" @default.
• W1992270086 modified "2023-09-25" @default.
• W1992270086 title "Effects of 2-methoxyethanol on fetal development, postnatal behavior, and embryonic intracellular pH of rats" @default.
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• W1992270086 doi "https://doi.org/10.1016/0892-0362(89)90070-6" @default.
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