Biointerfacial behavior of stallion spermatozoa adhered to hydrogel surfaces: Impact of the hydrogel chemical composition and the culture medium.

The research article explores how hydrogel surfaces impact the selection and behavior of stallion sperm cells, providing insights that could extend to the research of other mammalian reproductive cells.

Research Background and Objectives

• This study is primarily focused on exploring how innovative materials like hydrogels can impact the selection process for high-quality stallion sperm. The concept behind this study is that the sperm cells’ ability to adhere on hydrogel surfaces can be an indicator of their quality.
• The researchers designed hydrogel surfaces by using polyacrylamide (PAAm), which is copolymerized with both neutral and ionic co-monomers, in order to modify interfacial properties of the hydrogel surfaces.
• The research aim is to understand how the chemical composition of these hydrogel surfaces and the components of the culture medium impact the biointerfacial behavior of the spermatozoa.

Research Methods

• The study uses FTIR spectroscopy for characterizing the hydrogels. This process involves determining the hydrogels’ capacity to swell and their wettability under varying experimental conditions.
• For assessing sperm adhesion capacity on the hydrogel surfaces, several parameters such as the percentage of bound sperm (%Sp) to hydrogels, tail oscillation intensity, and flagellar movement are analyzed.
• Scanning Electron Microscopy (SEM) is used to study the morphology of the sperm’s head and tail after they have adhered to the hydrogels.

Research Findings

• The researchers found that the biointerfacial characteristics of the sperm-hydrogel systems are influenced by the hydrogel’s chemical composition and the components of the culture medium.
• Specific results indicate that a higher %Sp, indicative of better sperm quality, and robust metabolic activity of the spermatozoa are observed on hydrogel surfaces that display moderate hydrophilicity.
• Furthermore, it was discovered that a cationic hydrogel surface in BGM3 culture medium alongside a neutral surface in BGM3 medium with the addition of BSA were most favorable for promoting positive sperm outcomes.
• SEM showed that the adhered sperm maintained their normal morphology.

Conclusion and Implication

• Notably, the results suggest that these hydrogel surfaces have the potential to be effective tools in selecting high-quality stallion sperm.
• This finding provides an important innovation that can be extended into further study on other mammalian reproductive cells.