Developmental ethanol exposure impairs locomotor movement in Japanese medaka (Oryzias latipes) larvae targeting epigenome
| Autor: | Dennis R. Carty, Asok K. Dasmahapatra, Ikhlas A. Khan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Epigenomics
0301 basic medicine Embryo Nonmammalian animal structures Environmental Engineering Health Toxicology and Mutagenesis Oryzias Motor Activity Biology Andrology Toxicology 03 medical and health sciences chemistry.chemical_compound Human fertilization Gene expression Animals Environmental Chemistry Swimming Ethanol Public Health Environmental and Occupational Health Aquatic animal Embryo General Medicine General Chemistry Epigenome Japanese Medaka biology.organism_classification Pollution 030104 developmental biology Gene Expression Regulation chemistry Fetal Alcohol Spectrum Disorders Larva embryonic structures |
| Zdroj: | Chemosphere. 186:901-910 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2017.08.048 |
| Popis: | Evidence indicated ethanol exposure during development disrupts brain functions that induces fetal alcohol spectrum disorder (FASD) phenotypes with behavioral abnormalities. We aimed to investigate whether prenatal ethanol exposure has any potential impact on behavior of a FASD fish model. Fertilized Japanese medaka ( Oryzias latipes ) eggs were exposed to 100–300 mM ethanol or 2 mM 5-azacytidine (5-azaC), 0–2 day post fertilization (dpf), in embryo-rearing medium (ERM). Survived embryos were maintained in clean ERM and used either for gene expression analysis on 2- and 6-dpf or allowed to hatch for behavioral study. Photomotor response of 3–4 day post hatch larvae were tracked for 3 h with light-dark transitions. It was observed that larval swimming was phototactic; enhanced in presence of light, declined in dark. Phototactic response was also observed in larvae prenatally exposed to ethanol or 5-azaC; however, the total distance swum by these larvae compared to controls declined. Further analysis indicated that, in light phases, total swimming activity and average swimming speed were reduced in larvae prenatally exposed to ethanol (300 mM) or 5-azaC. Expression analysis of baz1a and baz2a in embryos indicated developmental regulation. Ethanol (100–300 mM) or 5-azaC (2 mM) were able to modulate downregulation of both baz1a and baz2a mRNAs only in 6 dpf embryos of 300 mM ethanol and 5-azaC (2 mM) groups. These studies indicated that prenatal exposure to ethanol or 5-azaC was able to disrupt movements and thus swimming behavior in FASD phenotypes probably due to delayed remodeling of genome and epigenome. |
| Databáze: | OpenAIRE |
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