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. 2018 Aug 16;15(2):124-134.
doi: 10.21451/1984-3143-2017-AR986.

Oocyte maturation with royal jelly increases embryo development and reduces apoptosis in goats

Affiliations

Oocyte maturation with royal jelly increases embryo development and reduces apoptosis in goats

Arash Veshkini et al. Anim Reprod. .

Abstract

Royal jelly (RJ) was supplemented to goat oocyte in vitro maturation (IVM) medium at three different concentrations (2.5, 5, and 10 mg/ml). Maturation rate, embryo cleavage, and blastocyst rate were recorded. Gene expression of apoptosis-related transcripts was investigated in matured oocytes. Percentage of oocytes that reached MII-stage was increased in RJ-treated groups compared to the control group. Glutathione (GSH) content of mature oocytes was enhanced when RJ was added to IVM medium at any supplementation compared with control. Percentage of cleaved embryos and blastocysts was higher in the RJ-treated groups at a concentration of 5 than in the 2.5 mg/ml and control group. Total number of cells per blastocyst was not different in the control and RJ-treated group at 5 mg/ml. However, number of apoptotic cells per blastocyst was higher in the control group than in the RJ-treated group at 5 mg/ml. Expression profile of Bax, and p53 was down-regulated while Bcl-2 was up-regulated in oocytes treated with RJ at 5 and 10 mg/ml compared with the control group. Addition of RJ at concentrations of 5 mg/ml improved embryo production through increasing maturation rate. RJ seems to improve the IVM microenvironment by reducing expression of genes inducing apoptosis, enhancing GSH content, and reducing incidence of apoptosis in blastocysts.

Keywords: embryo; gene expression; in vitro fertilization; oocyte; royal jelly.

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Figures

Figure 1
Figure 1. Percentages of cumulus expansion score (fully expanded, partially expanded, and non-expanded) of COCs treated with different concentrations of royal jelly during IVM. a,b,c,d Bars with uncommon superscripts are different (P < 0.05).
Figure 2
Figure 2. Glutathione content of oocytes treated with different concentrations of royal jelly during IVM. a,b,c,d Bars with uncommon superscripts are different (P < 0.05).
Figure 3
Figure 3. Representative images of oocytes’ fluorescent intensity for glutathione content.
Figure 4
Figure 4. Expression profile of Bax, Bcl-2, and p53 genes in oocytes treated with different concentrations of royal jelly during IVM using quantitative real-time PCR. a,b,c,dBars with uncommon superscripts are different (P < 0.05).

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