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The mechanics of hyperactivation in adhered human sperm

Ooi, Ean Hin and Smith, David J and Gadelha, Hermes and Gaffney, Eamonn A and Kirkman-Brown, Jackson C (2014) The mechanics of hyperactivation in adhered human sperm. [Dataset] (Submitted)

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Hyperactivation is an important phenomenon exhibited by mammalian sperm during the process of acquiring fertilisation capacity. The majority of studies have focused on incubation-induced hyperactivation in non-human species, which typically differ in size, shape, and are more homogeneous than human sperm. We develop an alternative approach via drug-induction, utilising high speed imaging and analysis of same-cell changes in the flagellar movement of adhered cells. Following stimulation with 4-aminopyridine, approximately two thirds (21/34) of the cells analysed exhibited a waveform with a single characteristic frequency; in all cases the frequency was lower than before stimulation. The remaining cells (13/34) exhibited a more complex motility with multiple frequency modes. The lowest mode in all cases was lower than the frequency prior to stimulation. Flagellar bending increased in all cells following stimulation, and was significantly greater in the multiple-frequency responders. Despite the increased bending, time-averaged hydrodynamic power dissipation decreased significantly when assessed across all cells, the effect being significantly greater in the multiple-frequency responders than single-frequency. These results reveal the heterogeneity of responses of human sperm to a hyperactivating stimulus, the methodology being potentially useful for assessing dynamic responses to stimuli in human sperm, and physiological selection of cells for assisted reproduction.

Type of Work:Dataset
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:Clinical and Experimental Medicine, Mathematics, Centre for Human Reproductive Science
Additional Information:

Supplementary data for an article submitted for publication, September 2014. Article details to follow upon publication.

Subjects:Q Science > QA Mathematics
Q Science > QP Physiology
Funders:Wellcome Trust, Medical Research Council, CAPES, Brazil, Birmingham Science City, Advantage West Midlands
ID Code:1921

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