Peritoneal fluid of women with endometriosis reduces SOD1 in bovine oocytes in vitro maturation

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Endometriosis peritoneal fluid significantly reduced SOD1 gene expression in bovine oocytes during in vitro maturation compared to control fluid.

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Abstract

Studies have demonstrated oxidative stress in peritoneal fluid (PF) from women with endometriosis and the importance of enzymatic antioxidant machinery to avoid oocyte oxidative damage. Considering that PF constantly surrounds the ovaries and has direct contact with the oocyte at ovulation, we wonder if PF from women with endometriosis may affect antioxidant enzyme gene expression. Thus, the present study aims to evaluate the PF impact from infertile women with minimal and mild endometriosis and from fertile control women without endometriosis on SOD1, CAT, GSR gene's expression in experimental bovine oocytes matured in vitro. Samples of PF were obtained from women who underwent videolaparoscopy-7 infertile with EI/II and 7 fertile without endometriosis. Immature bovine oocytes underwent in vitro maturation in the absence of PF and in the presence of three concentrations (1, 5 and 10%) of PF from fertile and from infertile women with EI/II. After 22 to 24 h of IVM, oocytes were denuded and stored for analysis of SOD1, CAT and GSR by real-time polymerase chain reaction. Oocyte SOD1 expression was significantly lower in the 10% endometriosis group (0.67 ± 0.32) when compared with no-peritoneal fluid (1.05 ± 0.24, p < 0.008) and 10% control groups (1.06 ± 0.22, p < 0.006). These findings raise the possibility of a deleterious influence of PF from women with EI/II on the oocyte, not only after ovulation but also during the maturation process, which could contribute to worsening oocyte quality, being one of the mechanisms related to infertility in patients with endometriosis.
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Abstract

Studies have demonstrated oxidative stress in peritoneal fluid (PF) from women with endometriosis and the importance of enzymatic antioxidant machinery to avoid oocyte oxidative damage. Considering that PF constantly surrounds the ovaries and has direct contact with the oocyte at ovulation, we wonder if PF from women with endometriosis may affect antioxidant enzyme gene expression. Thus, the present study aims to evaluate the PF impact from infertile women with minimal and mild endometriosis and from fertile control women without endometriosis on SOD1, CAT, GSR gene’s expression in experimental bovine oocytes matured in vitro. Samples of PF were obtained from women who underwent videolaparoscopy—7 infertile with EI/II and 7 fertile without endometriosis. Immature bovine oocytes underwent in vitro maturation in the absence of PF and in the presence of three concentrations (1, 5 and 10%) of PF from fertile and from infertile women with EI/II. After 22 to 24 h of IVM, oocytes were denuded and stored for analysis of SOD1, CAT and GSR by real-time polymerase chain reaction. Oocyte SOD1 expression was significantly lower in the 10% endometriosis group (0.67 ± 0.32) when compared with no-peritoneal fluid (1.05 ± 0.24, p < 0.008) and 10% control groups (1.06 ± 0.22, p < 0.006). These findings raise the possibility of a deleterious influence of PF from women with EI/II on the oocyte, not only after ovulation but also during the maturation process, which could contribute to worsening oocyte quality, being one of the mechanisms related to infertility in patients with endometriosis. Similar content being viewed by others

References

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Acknowledgements

The authors thank the staff of the Human Reproduction Laboratory, University Hospital, Department of Gynecology and Obstetrics, Ribeirão Preto Medical School, University of São Paulo (FMRP-USP) and the Multi-User Laboratory, Faculty of Medicine Ribeirão Preto, University of São Paulo (FMRP-USP), especially Cristiana Padovan for technical support. Funding This work was supported by the National Council for Scientific and Technological Development (CNPq), Brazil. Author information Authors and Affiliations Corresponding author Ethics declarations Conflict of interest The authors declare that they have no conflicts of interest. Electronic supplementary material ESM 1 (download DOCX ) (DOCX 18 kb) Rights and permissions About this article Cite this article Malvezzi, H., Da Broi, M.G., Meola, J. et al. Peritoneal fluid of women with endometriosis reduces SOD1 in bovine oocytes in vitro maturation. Cell Tissue Res 372, 621–628 (2018). https://doi.org/10.1007/s00441-018-2805-2 Received: Accepted: Published: Version of record: Issue date: DOI: https://doi.org/10.1007/s00441-018-2805-2

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endometriosis

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Ascitic Fluid Endometriosis In Vitro Oocyte Maturation Techniques Oocytes Superoxide Dismutase-1 Adult Animals Ascitic Fluid Catalase Catalase Cattle Endometriosis Female Glutathione Reductase Glutathione Reductase Humans Oocytes Superoxide Dismutase-1

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