Limited PCB antagonism of TCDD-induced malformations in mice
C57BL/6N mice used to model induction of cleft palate and kidney malformations in offspring following maternal treatment with TCDD, were dosed on gestation day (gd) 9 with 2,2',4,4',5,5'-hexachlorobiphenyl (HCB) (62.5, 125, 250, 500, 1000 mg/kg) and/or gd 10 with 2,3,7,8-tetrachlorodi...
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Published in | Toxicology letters Vol. 60; no. 1; p. 19 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Netherlands
01.01.1992
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Abstract | C57BL/6N mice used to model induction of cleft palate and kidney malformations in offspring following maternal treatment with TCDD, were dosed on gestation day (gd) 9 with 2,2',4,4',5,5'-hexachlorobiphenyl (HCB) (62.5, 125, 250, 500, 1000 mg/kg) and/or gd 10 with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) (15 or 18 micrograms/kg) to investigate the potential protective effects of HCB against TCDD-induced teratogenicity. Maternal body weight gain was increased by combinations of 15 micrograms TCDD/kg and 125-500 mg HCB/kg and decreased at doses of 15 micrograms TCDD/kg + 1000 HCB mg/kg. At the doses used in this study, there was no effect of either compound on number of live or dead offspring. Fetal body weight was slightly decreased in all groups dosed with greater than or equal to 250 mg HCB/kg. HCB did not induce cleft palate at a dose of 1000 mg/kg, but did induce increases in hydronephrosis and hydroureter at 500 and 1000 mg/kg. Combinations of HCB and TCDD decreased the incidence of cleft palate induced by TCDD alone, but only at doses of 15 micrograms TCDD/kg combined with 125-500 mg HCB/kg. The antagonism of hydronephrosis (incidence and severity) appeared over a narrower dose range (15 micrograms TCDD/kg + 500 mg HCB/kg). HCB induced increases (3-fold) in ethoxyresorufin-O-deethylase (EROD) activity at doses of 500 and 1000 mg/kg, suggesting that the limited antagonism of TCDD teratogenicity by HCB could be under the control of the Ah-receptor. |
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AbstractList | C57BL/6N mice used to model induction of cleft palate and kidney malformations in offspring following maternal treatment with TCDD, were dosed on gestation day (gd) 9 with 2,2',4,4',5,5'-hexachlorobiphenyl (HCB) (62.5, 125, 250, 500, 1000 mg/kg) and/or gd 10 with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) (15 or 18 micrograms/kg) to investigate the potential protective effects of HCB against TCDD-induced teratogenicity. Maternal body weight gain was increased by combinations of 15 micrograms TCDD/kg and 125-500 mg HCB/kg and decreased at doses of 15 micrograms TCDD/kg + 1000 HCB mg/kg. At the doses used in this study, there was no effect of either compound on number of live or dead offspring. Fetal body weight was slightly decreased in all groups dosed with greater than or equal to 250 mg HCB/kg. HCB did not induce cleft palate at a dose of 1000 mg/kg, but did induce increases in hydronephrosis and hydroureter at 500 and 1000 mg/kg. Combinations of HCB and TCDD decreased the incidence of cleft palate induced by TCDD alone, but only at doses of 15 micrograms TCDD/kg combined with 125-500 mg HCB/kg. The antagonism of hydronephrosis (incidence and severity) appeared over a narrower dose range (15 micrograms TCDD/kg + 500 mg HCB/kg). HCB induced increases (3-fold) in ethoxyresorufin-O-deethylase (EROD) activity at doses of 500 and 1000 mg/kg, suggesting that the limited antagonism of TCDD teratogenicity by HCB could be under the control of the Ah-receptor. |
Author | Morrissey, R E Harris, M W Diliberto, J J Birnbaum, L S |
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Snippet | C57BL/6N mice used to model induction of cleft palate and kidney malformations in offspring following maternal treatment with TCDD, were dosed on gestation day... |
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SubjectTerms | Abnormalities, Drug-Induced - prevention & control Animals Cleft Palate - chemically induced Cleft Palate - prevention & control Cytochrome P-450 CYP1A1 Cytochrome P-450 Enzyme System - analysis Dose-Response Relationship, Drug Female Hydronephrosis - chemically induced Hydronephrosis - prevention & control Male Mice Mice, Inbred C57BL Oxidoreductases - analysis Polychlorinated Biphenyls - pharmacology Polychlorinated Dibenzodioxins - antagonists & inhibitors Pregnancy |
Title | Limited PCB antagonism of TCDD-induced malformations in mice |
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