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Published in: Reproductive Biology and Endocrinology 1/2017

Open Access 01-12-2017 | Research

Oocyte polarized light microscopy, assay of specific follicular fluid metabolites, and gene expression in cumulus cells as different approaches to predict fertilization efficiency after ICSI

Authors: Alberto Revelli, Stefano Canosa, Loredana Bergandi, Oleksii A. Skorokhod, Valentina Biasoni, Andrea Carosso, Angela Bertagna, Milena Maule, Elisabetta Aldieri, Maria Diletta D’Eufemia, Francesca Evangelista, Nicola Colacurci, Chiara Benedetto

Published in: Reproductive Biology and Endocrinology | Issue 1/2017

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Abstract

Background

The complex relationship between oocyte morphology, specific follicular fluid metabolites, gene expression in cumulus granulosa cells, and oocyte competence toward fertilization and embryo development still needs further clarification.

Methods

Forty-six oocytes retrieved from the largest pre-ovulatory follicle of patients undergoing intra-cytoplasmic sperm injection (ICSI) were considered assessing: (a) oocyte morphological characteristics at polarized light microscopy (PLM), (b) specific follicular fluid (FF) metabolites previously suggested to influence oocyte competence (AMH, markers of redox status and of cytotoxicity), (c) transcription of AMH and AMH type II receptor genes in cumulus cells. Data were analyzed using mono-parametric tests and multivariable logistic analysis in order to correlate morphological and biochemical data with fertilization.

Results

Comparing normally fertilized oocytes (n = 29, F group) with unfertilized (n = 17, nF group) we observed that: (a) the meiotic spindle area and major axis were significantly higher in nF group and in fertilized oocytes undergoing an early embryo development arrest; (b) AMH level in FF was comparable in F and nF groups; (c) the FF of nF group contained significantly higher levels of cytotoxicity (lactate dehydrogenase) and oxidative stress (Cu,Zn-superoxide dismutase, catalase, 4-hydroxynonenal-protein conjugates) markers; (d) cumulus cells of nF group showed significantly higher AMH receptor type II gene expression.

Conclusions

Taken together, these observations suggest that an excessive cytotoxicity level can alter AMH signal transduction within cumulus cells, in turn leading to partial inhibition of aromatase activity, altered cytoplasmic maturation and increased oxidative stress, factors able to impair oocyte fertilization competence and embryo growth.
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Metadata
Title
Oocyte polarized light microscopy, assay of specific follicular fluid metabolites, and gene expression in cumulus cells as different approaches to predict fertilization efficiency after ICSI
Authors
Alberto Revelli
Stefano Canosa
Loredana Bergandi
Oleksii A. Skorokhod
Valentina Biasoni
Andrea Carosso
Angela Bertagna
Milena Maule
Elisabetta Aldieri
Maria Diletta D’Eufemia
Francesca Evangelista
Nicola Colacurci
Chiara Benedetto
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2017
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/s12958-017-0265-2

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