Journal
FRONTIERS IN ENDOCRINOLOGY
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fendo.2022.957684
Keywords
spermatozoa; cooperative behaviour; bundling; cell-cell interaction; sperm migration; sperm selection; sperm competition
Categories
Funding
- la Caixa Foundation [100010434]
- European Union [LCF/BQ/PI21/11830003]
- Ministry of Science and Innovation, Spain [AGL2017-88329-R, PID2020-113320RB-I00]
- Catalan Agency for Management of University and Research Grants, Regional Government of Catalonia, Spain [2017-SGR-1229]
- Catalan Institution for Research and Advanced Studies (ICREA)
- National Research Development & Innovation Office [TKP2021-EGA-42]
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This study investigates the effects of physical and biochemical factors on the formation of sperm bundles in bull sperm. It is found that fluid viscosity does not significantly influence sperm bundling, but swim-up, post-thaw migration time, and suppressed capacitation increase the occurrence of sperm bundles.
Cooperative behaviour of sperm is one of the mechanisms that plays a role in sperm competition. It has been observed in several species that spermatozoa interact with each other to form agglomerates or bundles. In this study, we investigate the effect of physical and biochemical factors that will most likely promote bundle formation in bull sperm. These factors include fluid viscosity, swim-up process, post-thaw incubation time and media additives which promote capacitation. While viscosity does not seem to influence the degree of sperm bundling, swim-up, post-thaw migration time and suppressed capacitation increase the occurrence of sperm bundles. This leads to the conclusion that sperm bundling is a result of hydrodynamic and adhesive interactions between the cells which occurs frequently during prolonged incubation times.
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