Effect of oocyte quality assessed by brilliant cresyl blue (BCB) staining on cumulus cell expansion and sonic hedgehog signaling in porcine during in vitro maturation

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Title
Effect of oocyte quality assessed by brilliant cresyl blue (BCB) staining on cumulus cell expansion and sonic hedgehog signaling in porcine during in vitro maturation
Author(s)
Sanghoon Lee; Hyogu Kang; Pil Soo Jeong; T Nanjidsuren; Bong-Seok Song; Yeung Bae Jin; Sang-Rae Lee; Sun-Uk KimBo Woong Sim
Bibliographic Citation
International Journal of Molecular Sciences, vol. 21, pp. 4423-4423
Publication Year
2020
Abstract
Brilliant cresyl blue (BCB) staining is used to select developmentally competent cumulus-oocyte complexes (COCs) for in vitro maturation (IVM). However, limited attention has been paid to what drives the higher developmental competence of BCB+ COCs. Sonic hedgehog signaling (SHH) is an important signaling pathway for ovarian follicular development and oocyte maturation. Therefore, this study investigated the effect of oocyte quality assessed by BCB staining on cumulus cell expansion, oocyte nuclear maturation, subsequent embryo development, apoptosis levels, and SHH signaling protein expression, in porcine COCs. After IVM, BCB+ COCs exhibited a significantly higher proportion of complete cumulus cell expansion and metaphase II rate in oocytes than BCB- COCs. After in vitro fertilization, the BCB+ group showed a significantly higher monospermy rate, fertilization efficiency, percentage of cleavage and blastocyst formation, with a higher total cell number and a lower apoptosis in blastocysts as compared with the BCB- group. Furthermore, significantly lower apoptosis levels and a higher expression of SHH-signaling proteins in COCs were observed, before and after IVM. In conclusion, high-quality oocytes had a greater potential to expand their surrounding cumulus cells with active SHH signaling and a lower apoptosis. This could provide COCs with a proper environment for maturation, thereby leading to a better subsequent embryo development.
Keyword
oocyte qualitybrilliant cresyl bluecumulus cell expansionSonic hedgehog signalingapoptosis
ISSN
1422-0067
Publisher
MDPI
DOI
http://dx.doi.org/10.3390/ijms21124423
Type
Article
Appears in Collections:
Ochang Branch Institute > Division of Bioinfrastructure > Futuristic Animal Resource & Research Center > 1. Journal Articles
Ochang Branch Institute > Division of Bioinfrastructure > National Primate Research Center > 1. Journal Articles
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