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Epigenetic reprogramming of gene promoters in the liver of adult female mice masculinized by testosterone

ABSTRACT: Testosterone (T) is known to masculinize the female phenotype of the liver evidenced as upregulated gene expression of male- and downregulated expression of female-predominant genes. To explore the a possibly T epigenetic control, we here screen genome-wide the liver for T-induced changes of the DNA methylation status of gene promoters. by methylated DNA immunoprecipitation and Nimblegen microarrays. Female C57BL/6 mice are treated with T for 3 weeks and, then, T treatment is discontinued for 12 weeks. The T-induced changes found suggest a functional impact since T induces under the same experimental conditions as used here persistent susceptibility to blood-stage malaria of Plasmodium chabaudi. We hypothesize that T epigenetically dys-regulates initial steps of liver-inherent innate immune mechanisms leading to dys-balanced host responses eventually causing the lethal outcome of otherwise self-healing infections.

ORGANISM(S): Mus musculus

PROVIDER: GSE57551 | GEO | 2020/04/30

REPOSITORIES: GEO

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Project description:Androgenic steroids are increasingly used for hormone therapy of postmenopausal women and abused as life style drugs and for doping purposes, though knowledge about associated health risks in females is very limited. In order to understand more about short- and long-term androgen effects on a molecular level, we have analyzed hepatic gene expression in female C57BL/6 mice immediately after subcutaneous treatment with testosterone for 3 weeks and after 12 weeks hormone withdrawal using Affymetrix array technology and quantitative real-time RT-PCR. Among about 14,000 genes examined, 48 were up- and 65 genes were downregulated by testosterone after 3-weeks treatment and about 50% of these changes persisted even 12 weeks after testostrone withdrawal. In addition to obvious risks such as induction of hepatocellular carcinomas and virilization of liver metabolism, testosterone induced a series of changes, as e.g. dysregulation of hepatic gene expression due to incomplete conversion of female to male phenotype â in particular downregulation of cytochrom P450 isoforms and sulfotransferases. As a long-term testosterone effect, transcripts emerged in the liver that are normally specific for the exocine pancreas including amylase 2, ribonuclease 1, and several trypsin-, chymotrypsin-, and elastase-like proteases. This transdifferentiation of hepatic to exocrine pancreatic tissue indicates that testosterone can initiate long-lasting differentiation programs, which â once induced â progress even after androgen withdrawal. This may have far-reaching consequences difficult to foresee implying long-term hazards of testosterone-treatment for female health that have not been taken into account yet. Mice were treated with testosterone or sesame oil (vehicle) for three weeks twice a week. Gene expression in the liver was analyzed either directly after treatment or after three weeks of hormone/vehicle withdrawal. For each of these four groups, three individual mice were used as biological replicates.

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Epigenetic reprogramming of gene promoters in the liver of adult female mice masculinized by testosterone

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