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Erschienen in: Journal of Assisted Reproduction and Genetics 1/2020

31.10.2019 | Gamete Biology

Capacitation IVM improves cumulus function and oocyte quality in minimally stimulated mice

verfasst von: Y. Zhao, X. Liao, A.E. Krysta, M.J. Bertoldo, D. Richani, R.B. Gilchrist

Erschienen in: Journal of Assisted Reproduction and Genetics | Ausgabe 1/2020

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Abstract

Purpose

Oocyte in vitro maturation (IVM) is a patient-friendly reproductive technology but lower success rates than IVF have limited its uptake. Capacitation-IVM (CAPA-IVM) is an innovative new IVM system currently undergoing clinical evaluation. This study aimed to determine temporal effects of the pre-IVM phase of CAPA-IVM on cumulus function and oocyte developmental competence in mildly-stimulated mice.

Methods

Immature cumulus oocyte complexes (COCs) derived from mildly stimulated (23 h PMSG) 28-day-old mice underwent pre-IVM for 0–24 h in medium containing c-type natriuretic peptide (CNP), E2, FSH and insulin, prior to IVM (CAPA-IVM). The effect of pre-IVM duration on cumulus cell function and embryo development post-CAPA-IVM/IVF was assessed.

Results

Day 6 blastocyst rate increased incrementally with increasing pre-IVM duration: 40.6 ± 2.0%, 45.8 ± 1.2%, 52.2 ± 3.5%, 53.3 ± 5.9%, and 59.9 ± 2.5% for 0, 2, 6, 12, and 24 h pre-IVM, respectively (P < 0.01). DNA content/COC, a measure of cumulus cell proliferation, was significantly higher with 24 h pre-IVM group compared to 0, 2, or 6 h pre-IVM (P < 0.001). Pre-IVM for 24 h significantly increased cumulus expansion and mRNA expression of matrix genes Has2 and Tnfaip6 and Areg relative to no pre-IVM control (P < 0.01). Cumulus-oocyte gap-junctional communication (GJC) was maintained throughout 24 h pre-IVM (P < 0.0001), and GJC loss was slowed during the subsequent IVM phase, whilst meiotic resumption was accelerated (P < 0.05). Pre-IVM increased COC ATP and ADP content (P < 0.05), but not AMP, ATP/ADP, and energy charge.

Conclusion

The pre-IVM phase of CAPA-IVM improves the quality of IVM oocytes in a temporally dependent manner and significantly influences cumulus cell function including increased cell proliferation, cumulus expansion, and prolonged cumulus-oocyte GJC.
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Metadaten
Titel
Capacitation IVM improves cumulus function and oocyte quality in minimally stimulated mice
verfasst von
Y. Zhao
X. Liao
A.E. Krysta
M.J. Bertoldo
D. Richani
R.B. Gilchrist
Publikationsdatum
31.10.2019
Verlag
Springer US
Erschienen in
Journal of Assisted Reproduction and Genetics / Ausgabe 1/2020
Print ISSN: 1058-0468
Elektronische ISSN: 1573-7330
DOI
https://doi.org/10.1007/s10815-019-01610-x

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