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Can apoptosis and necrosis coexist in ejaculated human spermatozoa during in vitro semen bacterial infection?

  • Gamete Biology
  • Published:
Journal of Assisted Reproduction and Genetics Aims and scope Submit manuscript

Abstract

Purpose

To evaluate whether ejaculated human spermatozoa undergo complete apoptosis or necrosis during experimental semen bacterial infection in vitro.

Methods

Apoptotic markers, including mitochondrial transmembrane potential (ΔΨm), phosphatidylserine (PS) externalization, and DNA fragmentation, have been detected simultaneously in ejaculated human sperm after their incubation with a known pathogenic (Escherichia coli), as well as with conditionally pathogenic bacterial strains (Staphylococcus haemolyticus, Bacteroides ureolyticus) and/or leukocytes. The ΔΨm and translocation of PS was evaluated using the JC-1 and Annexin V binding tests, respectively. A modified TUNEL assay with additional staining for sperm viability was used to detect the DNA fragmentation level.

Results

The exposure of ejaculated spermatozoa to bacterial strains was associated with a simultaneous decrease in the percentage of sperm with normal ΔΨm and an increase in the proportion of Annexin V-positive sperm. Additionally, in the presence of S. haemolyticus, B. ureolyticus and/or leukocytes, a significant increase in the percentage of live TUNEL-positive (apoptotic) as well as dead TUNEL-positive (necrotic) sperm cells was also observed.

Conclusions

The cellular death observed in spermatozoa in the presence of inflammatory mediators may be due to both apoptosis and necrosis. Here, we demonstrate for the first time that direct contact of conditionally pathogenic bacteria with ejaculated human sperm may play an even greater role in the promotion of apoptosis than in case of some pathogenic bacterial strains. These findings suggest that significant bacteriospermia and leukocytospermia may be direct causes of subfertility or additional negative factors worsening the prognosis of fertility in natural and assisted procreation.

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Acknowledgments

The authors wish to thank Anna Czernikiewicz, M.Sc. for blood sample processing. Tomasz Kolanowski is a scholarship recipient of EU 8.2.2 OP- Innovative Economy.

Grant support

This work was financed by Ministry of Science and Higher Education grant No. NN 407283539 and National Centre for Research and Development grant No. NR 13006606.

Ethical statement

This study was approved by the Local Bioethical Committee of Medical University of Poznan, Poland. Informed consent was obtained from all the participants included to the study.

Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to Maciej Kurpisz.

Additional information

Capsule Ejaculated human spermatozoa undergo complete apoptosis and necrosis during semen bacterial infection; it is possible to induce sperm apoptosis/necrosis in the presence of conditionally pathogenic bacterial strains.

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Fraczek, M., Hryhorowicz, M., Gaczarzewicz, D. et al. Can apoptosis and necrosis coexist in ejaculated human spermatozoa during in vitro semen bacterial infection?. J Assist Reprod Genet 32, 771–779 (2015). https://doi.org/10.1007/s10815-015-0462-x

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  • DOI: https://doi.org/10.1007/s10815-015-0462-x

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