Related Experiment Video
Updated: Feb 16, 2026
Fluorimetric Techniques for the Assessment of Sperm Membranes
Published on: November 28, 2018
Single-cell-based evaluation of sperm progressive motility via fluorescent assessment of mitochondria membrane
Natalina Moscatelli1,2, Barbara Spagnolo1, Marco Pisanello1
1Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia, Via Barsanti, I-73010, Arnesano (LE), Italy.
Abstract:
Sperm cells progressive motility is the most important parameter involved in the fertilization process. Sperm middle piece contains mitochondria, which play a critical role in energy production and whose proper operation ensures the reproductive success. Notably, sperm progressive motility is strictly related to mitochondrial membrane potential (MMP) and consequently to mitochondrial functionality. Although previous studies presented an evaluation of mitochondrial function through MMP assessment in entire sperm cells samples, a quantitative approach at single-cell level could provide more insights in the analysis of semen quality. Here we combine laser scanning confocal microscopy and functional fluorescent staining of mitochondrial membrane to assess MMP distribution among isolated spermatozoa. We found that the sperm fluorescence value increases as a function of growing progressive motility and that such fluorescence is influenced by MMP disruptors, potentially allowing for the discrimination of different quality classes of sperm cells in heterogeneous populations.
Insights
Assessing mitochondrial membrane potential (MMP) in individual sperm cells offers new insights into semen quality. Higher MMP correlates with increased progressive motility, enabling better discrimination of sperm cell quality.
Area of Science:
- Reproductive Biology
- Cellular Biology
- Mitochondrial Function
Background:
- Progressive sperm motility is crucial for fertilization.
- Mitochondria in sperm middle piece are vital for energy production and reproductive success.
- Sperm motility is closely linked to mitochondrial membrane potential (MMP) and function.
Purpose of the Study:
- To quantitatively assess MMP distribution at the single-cell level in isolated spermatozoa.
- To explore the relationship between MMP and sperm progressive motility.
- To evaluate the potential for discriminating sperm quality classes using MMP.
Main Methods:
- Utilized laser scanning confocal microscopy.
- Employed functional fluorescent staining for mitochondrial membranes.
- Analyzed MMP distribution in isolated spermatozoa.
Main Results:
- Sperm fluorescence intensity positively correlates with progressive motility.
- MMP disruptors significantly influence sperm fluorescence.
- The method shows potential for differentiating sperm quality in mixed populations.
Conclusions:
- Single-cell MMP assessment provides a more nuanced view of semen quality than population-level analysis.
- MMP measurement is a promising biomarker for evaluating sperm function and motility.
- This quantitative approach can aid in classifying sperm cell populations based on their functional status.
