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Int J Radiat Res 2006, 4(1): 35-40 Back to browse issues page
Effect of vitamin E on preovulatory stage irradiated female mouse expressed as chromosomal abnormalities in generated embryos
M. Salimi, H. Mozdarani
, mozdarah@modares.ac.ir
Abstract:   (14566 Views)
Background: The present study has been carried out to investigate the effects of preovulatory stage gamma-irradiation of female mice in the absence or presence of vitamin E on numerical chromosome abnormalities in 8-cell embryos after mating with non-irradiated males. Materials and Methods: The 8-11 weeks adult female NMRI mice were whole body irradiated at preovulatory stage (post PMSG injection and about 12-18 hours before injecting HCG) with 4 Gy gamma-rays generated from a cobalt-60 source alone or in combination with 200 IU/kg vitamin E, intrapretoneally administered one hour prior to irradiation. Soon after HCG injection super ovulated irradiated females were mated with non-irradiated males. About 68-h post coitous (p.c), 8-cell embryos were flushed from the oviducts of pregnant mice and were fixed on slides using standard methods in order to screen for metaphase spreads and numerical chromosome abnormalities. Results: In control embryos, 8% of metaphase plates were aneuploid, whereas in preovulatory stage irradiated female mice, about 50% of metaphase plates of embryos showed numerical chromosome aberrations ( P<0.001 ). Administration of vitamin E one hour before the irradiation reduced chromosomal aberrations significantly (P=0.005). Conclusion: Results show that the effects of gamma-irradiation on preovulatory stage oocytes led to chromosomal abnormalities in subsequent embryos generated by these oocytes. Increase the frequency of numerical chromosome abnormalities -mostly aneuploidy- may be due to abnormal chromosomal non disjunctions during 2nd meiotic division. Reduction of the frequency of chromosome aberrations in the presence of vitamin E is probably due to antioxidant effects of this vitamin, and scavenging free radicals induced by gamma-rays in mice oocytes’ environment.
Keywords: Preimplantation embryos, chromosomal abnormalities, mouse oocytes, gamma-rays, vitamin E
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Type of Study: Original Research | Subject: Radiation Biology
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Salimi M, Mozdarani H. Effect of vitamin E on preovulatory stage irradiated female mouse expressed as chromosomal abnormalities in generated embryos. Int J Radiat Res. 2006; 4 (1) :35-40
URL: http://ijrr.com/article-1-210-en.html


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Volume 4, Issue 1 (Summer 2006) Back to browse issues page
International Journal of Radiation Research
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