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Fluorimetric Techniques for the Assessment of Sperm Membranes
Published on: November 28, 2018
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Gold nanoparticles interfere with sperm functionality by membrane adsorption without penetration.
Ulrike Taylor1, Annette Barchanski, Svea Petersen
1Department of Biotechnology, Friedrich-Loeffler-Institut , Neustadt , Germany .
Nanotoxicology
|December 3, 2013
Summary
Gold nanoparticles negatively impact sperm motility and fertilizing ability by interacting with the sperm surface membrane, even without entering the cells. This finding is crucial for understanding nanoparticle reproductive toxicity.
Area of Science:
- Reproductive Toxicology
- Nanomedicine
- Biophysics
Background:
- Gold nanoparticles (AuNPs) are increasingly used in biomedical applications.
- Understanding their potential reproductive toxicity is crucial for safety assessments.
- Previous studies have not fully elucidated the mechanism of AuNP reprotoxicity.
Purpose of the Study:
- To investigate the reprotoxic effects of ligand-free and oligonucleotide-conjugated gold nanoparticles on bovine spermatozoa.
- To determine the impact of gold nanoparticles on sperm motility, morphology, viability, and fertilizing ability.
- To elucidate the interaction mechanism between gold nanoparticles and sperm cells.
Main Methods:
- Bovine spermatozoa were exposed to varying concentrations of gold nanoparticles synthesized by laser ablation.
- Sperm parameters including motility, morphology, and viability were assessed.
- Transmission electron microscopy (TEM) was used to visualize nanoparticle-sperm interactions.
- Molecular analysis identified changes in cell membrane thiol residues.
- Sperm fertilizing ability was evaluated post-exposure.
Main Results:
- Sperm motility significantly declined at 10 µg/ml of gold nanoparticles, irrespective of surface modification.
- Sperm morphology and viability remained unaffected across all tested concentrations.
- TEM revealed nanoparticle attachment to the sperm membrane, without evidence of cellular entry.
- A reduction in free thiol residues on the sperm membrane was observed post-exposure.
- Fertilizing ability decreased with ligand-free gold nanoparticles at 10 µg/ml.
Conclusions:
- Gold nanoparticles can impair sperm motility and fertilizing ability through surface membrane interactions.
- The observed effects are likely mediated by alterations in membrane properties, such as thiol residue reduction.
- Nanoparticle surface modification and aggregation may influence toxicity.
- These findings highlight the importance of considering nanoparticle-surface interactions in reproductive risk assessments.
