Abstract
Necrostatin 1 (Nec1) is widely used in disease models to examine the contribution of receptor-interacting protein kinase 1 in cell death. The biological actions of Nec1 are blocking necrotic cell death. The purpose of this study was to investigate whether adding Nec1 into in vitro maturation (IVM) media, followed by vitrification procedures, could enhance the survival and developmental competency of oocytes. Germinal vesicle oocytes were matured in IVM medium containing 2 different doses of Nec1 (0.5 and 1 μmol/L). After IVM, the oocytes were vitrified using a 2-step exposure to equilibrium and vitrification solutions. After warming, the rates of survival, fertilization, embryonic development up to blastocyst in vitro, morphology of spindle and chromosome, membrane integrity, mitochondria integrity, and several gene expressions were evaluated. The survival and developmental competency of oocytes were higher in the 1 μmol/L Nec1-treated group than control. The proportion with intact spindles/chromosomes and stable membranes was similar in all the groups. The mitochondrial integrity of all Nec1-treated groups showed a higher score with strong staining. The 1 μmol/L Nec1 showed significantly increased expressions of Mad2, Gdf9, and Bcl2. The Cirp level had a tendency to be downregulated in the 0.5 µmol/L Nec1 but upregulated in the 1 μmol/L Nec1, compared with the control. The Mtgenome expressions were significantly decreased in both Nec1 groups. The supplementation of 1 μmol/L Nec1 into the IVM medium could be beneficial for the survival and development of immature oocytes after vitrification.
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Jo, J.W., Lee, J.R., Jee, B.C. et al. Exposing Mouse Oocytes to Necrostatin 1 During In Vitro Maturation Improves Maturation, Survival After Vitrification, Mitochondrial Preservation, and Developmental Competence. Reprod. Sci. 22, 615–625 (2015). https://doi.org/10.1177/1933719114556482
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DOI: https://doi.org/10.1177/1933719114556482