Human sperm decondensation in vitro is related to cleavage rate and embryo quality in IVF
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To investigate whether the ability of human spermatozoa to decondense in vitro in the presence of heparin (Hep) and glutathione (GSH) is related to assisted reproduction (ART) success.
Cross-sectional pilot study involving male partners of 129 infertile couples undergoing ICSI with (45) or without (84) donor oocytes at two infertility clinics in CABA, Argentina, between October 2012 and December 2013. In vitro decondensation kinetics with Hep and GSH and DNA fragmentation (TUNEL) were determined on the same sample used for ICSI. The possible relationship of decondensation parameters (maximum decondensation and decondensation velocity) and TUNEL values with ART success was evaluated.
Embryo quality correlated positively with decondensation velocity (D60/D30) (Spearman’s correlation, p < 0.05). According to D60/D30 values, patients were classified as slow decondensers (SlowD) (n = 68) or fast decondensers (FastD) (n = 61). Embryo quality was better in FastD (unpaired t test, p < 0.05). FastD and SlowD were subdivided according to use of donor oocytes. Among SlowD, biochemical and clinical pregnancy rates per transfer were significantly higher in donor (n = 19) vs. in non-donor (n = 31) cycles (Fisher’s exact test, p < 0.05). TUNEL values were not related to embryo quality, but no clinical pregnancies or live births were achieved in TUNEL+ SlowD (n = 7).
Decondensation kinetics of human spermatozoa in vitro with Hep and GSH could be related to embryo quality and ART success.
KeywordsSperm decondensation ART success Heparin DNA fragmentation Human spermatozoa
CG, MYC, and VJ contributed substantially to acquisition, analysis, and interpretation of data corresponding to in vitro sperm decondensation. RR and LR contributed substantially to acquisition, analysis, and interpretation of data corresponding to DNA fragmentation assessment and ART performance. GRV supervised all clinical procedures. GRV, LC, JCC, VJ, and MR contributed substantially to conception and design, data analysis, and interpretation of data and drafting of the article. All authors contributed substantially to drafting and critical revision of the article and approved the final version submitted for publication.
This work was supported by CONICET grant BID PICT 2012-2489 and by a grant from Fundación Bigand, Buenos Aires, Argentina. MYC and CG are doctoral fellows, CONICET, Argentina.
Compliance with ethical standards
This study was approved by CEPI (Ethics Committee of Hospital Italiano de Buenos Aires) and IBYME Ethics Committee.
Conflict of interest
The authors declare that they have no conflict of interest.
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