| Autor: |
Prokopec SD; Ontario Institute for Cancer Research, Toronto, Canada., Viluksela M; Department of Environmental and Biological Sciences, School of Pharmacy (Toxicology), University of Eastern Finland, Kuopio, Finland.; Environmental Health Unit, Finnish Institute for Health and Welfare (THL), Kuopio, Finland., Miettinen HM; Environmental Health Unit, Finnish Institute for Health and Welfare (THL), Kuopio, Finland.; A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland., Boutros PC; Department of Medical Biophysics, University of Toronto, Toronto, Canada. pboutros@mednet.ucla.edu.; Department of Pharmacology and Toxicology, Universally of Toronto, Toronto, Canada. pboutros@mednet.ucla.edu.; Department of Human Genetics, University of California, Los Angeles, 12-109 CHS, 10833 Le Conte Avenue, Los Angeles, CA, 90095, USA. pboutros@mednet.ucla.edu.; Department of Urology, University of California, Los Angeles, Los Angeles, USA. pboutros@mednet.ucla.edu.; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, USA. pboutros@mednet.ucla.edu.; Institute for Precision Health, University of California, Los Angeles, Los Angeles, USA. pboutros@mednet.ucla.edu.; Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, USA. pboutros@mednet.ucla.edu., Pohjanvirta R; Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 66, 00014, Helsinki, Finland. raimo.pohjanvirta@helsinki.fi. |
| Abstrakt: |
In rats, direct exposure to TCDD causes myriad toxicities. Exposed rats experience hepatotoxicity, wasting syndrome and immune suppression, amongst others. "Inherited exposure", as occurs in the F3 generation of directly exposed F0 animals, has also been shown to cause toxicity: both male and female F3 rats demonstrate an increased incidence of adult onset disease, females also display reproductive abnormalities and increased incidence of ovarian diseases while males show increased incidence of kidney disease and an altered sperm epigenome. Here, we explore the hepatic transcriptomic profile of male and female F3 Sprague-Dawley rats bred through the paternal germ line from F0 dams exposed to a single dose of TCDD (0, 30, 100, 300 or 1000 ng/kg body weight) by oral gavage. We hypothesize that RNA transcripts with altered abundance in livers of unexposed F3 progeny of treated F0 Sprague-Dawley rats may result from epigenetic modifications to the genome. We further survey patterns of differential methylation within male F3 rat testis. Female F3 rats demonstrated more TCDD-mediated hepatic transcriptomic changes than males, with differences primarily in the lowest dose group. In testis from male F3 rats, multiple olfactory receptors displayed patterns of differential methylation. Hypermethylation of Egfr and Mc5r among testes from TCDD lineage rats was observed, but without corresponding changes in hepatic mRNA abundance. Further studies examining these differences in other tissue types are warranted. |
Full text from SpringerLink