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Dioxin effect on the pituitary and hypothalamic expression of genes in male fetal Wistar rats

ABSTRACT: 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) causes the many forms of reproductive toxicity, such as defects in sexual behaviors, in pups of which mother is exposed to this substance at lower doses. However, the mechanism underlying these defects remains to be clarified in spite of many researches conducted so far. Our previous studies have revealed that maternal treatment with TCDD attenuates the production of pituitary gonadotropins [luteinizing hormone (LH) and follicle-stimulating hormone] in the late fetuses, leading to the impairment of sexual behavior in adulthood. To identify the target genes for a fetal reduction in gonadotropin β-subunit, we performed DNA microarray analysis using the fetal pituitary and its regulatory organ, the hypothalamus. The result showed that TCDD induced histone deacetylases (HDACs), and altered the expression of genes including gonadotropin-releasing hormone and activin signaling in the fetal pituitary. Moreover, our data indicated that the increased deacetylation of histone due to HDAC induction plays a critical role for a dioxin-induced attenuation of LHβ in the fetal pituitary. This study suggests a novel molecular mechanism explaining dioxin-produced reproductive toxicity.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE32459 | GEO | 2011/10/01

SECONDARY ACCESSION(S): PRJNA147867

REPOSITORIES: GEO

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Dioxin effect on the pituitary and hypothalamic expression of genes in male fetal Wistar rats

Project description:2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) causes the many forms of reproductive toxicity, such as defects in sexual behaviors, in pups of which mother is exposed to this substance at lower doses. However, the mechanism underlying these defects remains to be clarified in spite of many researches conducted so far. Our previous studies have revealed that maternal treatment with TCDD attenuates the production of pituitary gonadotropins [luteinizing hormone (LH) and follicle-stimulating hormone] in the late fetuses, leading to the impairment of sexual behavior in adulthood. To identify the target genes for a fetal reduction in gonadotropin β-subunit, we performed DNA microarray analysis using the fetal pituitary and its regulatory organ, the hypothalamus. The result showed that TCDD induced histone deacetylases (HDACs), and altered the expression of genes including gonadotropin-releasing hormone and activin signaling in the fetal pituitary. Moreover, our data indicated that the increased deacetylation of histone due to HDAC induction plays a critical role for a dioxin-induced attenuation of LHβ in the fetal pituitary. This study suggests a novel molecular mechanism explaining dioxin-produced reproductive toxicity. Pregnant Wistar rats were orally treated with TCDD (1 µg/kg in corn oil) at gestational day (GD)15. Then, the total RNA was extracted from the fetal pituitary and hypothalamus at GD20. To identify the target genes the alteration of which contributes to a reduction in fetal gonadotropin β-subunit, the profile of gene expression was analyzed using the Illumina RatRef-12 Expression BeadChip.

2011-09-30 | E-GEOD-32459 | biostudies-arrayexpress

Effect of maternal exposure to dioxin on the pituitary and hypothalamic expression of genes in PND70 male pups

Project description:Our previous studies have revealed that treatment of pregnant rats with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD, 1 M-NM-<g/kg) at gestational day (GD) 15 reduces the pituitary synthesis of luteinizing hormone (LH) during late fetal and early postnatal period, leading to imprinting of defects in sexual behaviors at adulthood. However, it remains obscure how the attenuation of pituitary LH links to sexual immaturity. To address this issue, we firstly performed a DNA microarray analysis to identify the gene(s) responsible for dioxin-induced sexual immaturity, using the pituitary and hypothalamus of male pups, at the age of postnatal day (PND)70, born from TCDD-treated dams. Among the reduced genes, we focused on gonadotropin-releasing hormone (GnRH) in the hypothalamus, because of its role in sexual behaviors suggested so far. The present study strongly suggests that maternal exposure to TCDD fixes the status of the lowered expression of GnRH in the offspring by reducing steroidogenesis at perinatal stage, and this is the mechanism for the imprinting of defects in sexual behaviors at adulthood. Total RNA was isolated from the pituitary and hypothalamus of PND70 male pups born from the dams treated with TCDD (1 M-NM-<g/kg) or vehicle at GD15, using an RNeasy Mini Kit (QIAGEN). To identify the gene(s) the altered expression of which is fixed and linked to defects in sexual behaviors, the profile of gene expression was analyzed using the Illumina RatRef-12 Expression BeadChip. This series includes two dataset; hypothalamic and pituitary samples (each case; N=3x2). The normalization applied each dataset.

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Effect of maternal exposure to dioxin on the pituitary and hypothalamic expression of genes in PND70 male pups

Project description:Our previous studies have revealed that treatment of pregnant rats with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD, 1 μg/kg) at gestational day (GD) 15 reduces the pituitary synthesis of luteinizing hormone (LH) during late fetal and early postnatal period, leading to imprinting of defects in sexual behaviors at adulthood. However, it remains obscure how the attenuation of pituitary LH links to sexual immaturity. To address this issue, we firstly performed a DNA microarray analysis to identify the gene(s) responsible for dioxin-induced sexual immaturity, using the pituitary and hypothalamus of male pups, at the age of postnatal day (PND)70, born from TCDD-treated dams. Among the reduced genes, we focused on gonadotropin-releasing hormone (GnRH) in the hypothalamus, because of its role in sexual behaviors suggested so far. The present study strongly suggests that maternal exposure to TCDD fixes the status of the lowered expression of GnRH in the offspring by reducing steroidogenesis at perinatal stage, and this is the mechanism for the imprinting of defects in sexual behaviors at adulthood.

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