期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/ijms21124423
关键词
oocyte quality; brilliant cresyl blue; cumulus cell expansion; Sonic hedgehog signaling; apoptosis
资金
- KRIBB Research Initiative Program, Republic of Korea [KGM4252021]
- Bio & Medical Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MEST), Republic of Korea [2018M3A9H1023142]
- National Research Council of Science & Technology (NST), Republic of Korea [KGM4252021] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018M3A9H1023142] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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