Oocyte quality determines bovine embryo development after fertilisation with hydrogen peroxide-stressed spermatozoa
Mohammad Bozlur Rahman A D , Leen Vandaele A , Tom Rijsselaere A , Mahdi Zhandi B , Dominiek Maes A , Mohammed Shamsuddin C and Ann Van Soom A
+ Author Affiliations
- Author Affiliations
A Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
B Department of Animal Science, University of Tehran, Karaj, Iran.
C Department of Surgery and Obstetrics, Bangladesh Agricultural University, Mymensingh, Bangladesh.
D Corresponding author. Email: mohammadbozlur.rahman@ugent.be
Reproduction, Fertility and Development 24(4) 608-618 https://doi.org/10.1071/RD11237
Submitted: 18 September 2011 Accepted: 12 October 2011 Published: 25 November 2011
Abstract
Exposure of gametes to specific stressors at sublethal levels can enhance the gametes’ subsequent performance in processes such as cryopreservation. In the present study, bull spermatozoa were subjected to H2O2 for 4 h at 100-, 200- and 500-μM levels; computer-assisted sperm analysis (CASA) and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling (TUNEL) assay were used for evaluation of subsequent sperm motility and DNA integrity, respectively. Exposure of spermatozoa to H2O2 did not affect sperm motility but DNA integrity was negatively affected by 500 μM H2O2 compared with mock-exposed spermatozoa, whereas both motility and DNA integrity were affected compared with untreated spermatozoa. Nevertheless, insemination of oocytes with spermatozoa exposed to 200 μM H2O2 increased fertilisation, cleavage and blastocyst rates (P < 0.05). Furthermore, the higher blastocyst yield after fertilisation of oocytes with spermatozoa exposed to 200 μM H2O2 was related to oocyte diameter, with large–medium oocytes yielding higher blastocyst rates, while small-diameter oocytes consistently failed to develop into blastocysts. In conclusion, the results indicate that exposure of spermatozoa to 200 μM H2O2 before sperm–oocyte interaction may enhance in vitro embryo production in cattle. However, this increased embryo production is largely dependent on the intrinsic quality of the oocytes.
Additional keywords: DNA damage, oxidative stress, total cell number.
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