Synchronization of In Vitro Maturation in Porcine Oocytes

Somfai, T.; Hirao, Yuji

doi:10.1007/978-1-4939-6603-5_16

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…In the main experiment of oocyte maturation inhibition, we inhibited oocyte maturation by dbcAMP, a well known reagent that mimics endogenous cAMP and inhibits nuclear progression during the meiotic process in porcine oocytes (Somfai et al, 2003;Somfai and Hirao, 2017). COCs in the control group were cultured in NCSU-23 medium using the same method as described above.…”

Section: Extended Dbcamp Treatment In Ncsu-23 Mediummentioning

confidence: 99%

Autophagic activation in porcine oocytes is independent of meiotic progression

Lee

Jeong

et al. 2023

Zygote

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Summary In this study, we built on our previous research that discovered that autophagy activated the metaphase I stage during porcine oocytes in vitro maturation. We investigated the relationship between autophagy and oocyte maturation. First, we confirmed whether autophagy was activated differently by different media (TCM199 and NCSU-23) during maturation. Then, we investigated whether oocyte maturation affected autophagic activation. In addition, we examined whether the inhibition of autophagy affected the nuclear maturation rate of porcine oocytes. As for the main experiment, we measured LC3-II levels using western blotting after inhibition of nuclear maturation via cAMP treatment in an in vitro culture to clarify whether nuclear maturation affected autophagy. After autophagy inhibition, we also counted matured oocytes by treating them with wortmannin or a E64d and pepstatin A mixture. Both groups, which had different treatment times of cAMP, showed the same levels of LC3-II, while the maturation rates were about four times higher after cAMP 22 h treatment than that of the 42 h treatment group. This indicated that neither cAMP nor nuclear status affected autophagy. Autophagy inhibition during in vitro oocyte maturation with wortmannin treatment reduced oocyte maturation rates by about half, while autophagy inhibition by the E64d and pepstatin A mixture treatment did not significantly affect the oocyte maturation. Therefore, wortmannin itself, or the autophagy induction step, but not the degradation step, is involved in the oocyte maturation of porcine oocytes. Overall, we propose that oocyte maturation does not stand upstream of autophagy activation, but autophagy may exist upstream of oocyte maturation.

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Section: Extended Dbcamp Treatment In Ncsu-23 Mediummentioning

confidence: 99%