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Inducible Nitric Oxide Synthase and Heme Oxygenase 1 Are Expressed in Human Cumulus Cells and May Be Used as Biomarkers of Oocyte Competence

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Abstract

The interplay between oocyte and surrounding cumulus cells (CCs) during follicular growth influences oocyte competence to undergo fertilization and sustain embryo development. The expression of many genes and proteins in CCs has been suggested as potential biomarker of oocyte competence in human in vitro fertilization (IVF). In the present study, we analyzed 90 human cumulus–oocyte complexes obtained during IVF procedure: 30 CCs were analyzed using quantitative real-time polymerase chain reaction and 60 CCs using Western blotting analysis to detect gene and protein expression of some enzymes related to oxidative stress, that is, the 3 nitric oxide synthase (NOS) isoforms and heme oxygenase 1 (HO-1). In the group of 60 CCs, we also investigated the expression and phosphorylation of IkBα, a known inhibitor of the nuclear factor κB (NF-κB) pathway, which controls several redox-sensitive genes. The expression of the messenger RNAs (mRNAs) was related to the oocyte morphological analysis performed by polarized light microscopy and to the occurrence of normal fertilization after intracytoplasmic sperm injection. We observed that the amount of iNOS and HO-1 mRNAs and proteins is significantly higher, and that in the meanwhile the NF-κB pathway is activated, in CCs corresponding to oocytes that were not fertilized in comparison to CCs whose corresponding oocyte showed normal fertilization. Instead, no correlation between the fertilization and the oocytes’ morphological data was observed. These results suggest that the increase in iNOS and HO-1 mRNAs expression in CCs is a negative index of oocyte fertilizability and might be an useful tool for oocyte selection.

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Authors and Affiliations

  1. Department of Oncology, University of Torino, Via Santena 5/bis, 10126, Torino, Italy

    Loredana Bergandi PhD, Elisabetta Aldieri PhD & Dario Ghigo MD

  2. Department of Surgical Sciences, University of Torino, S. Anna Hospital, Torino, Italy

    Gemma Basso MD, Francesca Evangelista, Stefano Canosa, Alberto Revelli MD & Chiara Benedetto MD

  3. Department of Public Health and Pediatrics, University of Torino, Torino, Italy

    Paola Dalmasso

Authors
  1. Loredana Bergandi PhD
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  2. Gemma Basso MD
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  3. Francesca Evangelista
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  4. Stefano Canosa
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  6. Elisabetta Aldieri PhD
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  7. Alberto Revelli MD
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Correspondence to Loredana Bergandi PhD.

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Bergandi, L., Basso, G., Evangelista, F. et al. Inducible Nitric Oxide Synthase and Heme Oxygenase 1 Are Expressed in Human Cumulus Cells and May Be Used as Biomarkers of Oocyte Competence. Reprod. Sci. 21, 1370–1377 (2014). https://doi.org/10.1177/1933719114525268

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  • DOI: https://doi.org/10.1177/1933719114525268

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