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Updated: Jun 5, 2026
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High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa
Published on: June 23, 2023
Optimized MTT Assay for Metabolic Activity Evaluation in Human Spermatozoa
Bárbara Guerra-Carvalho1,2,3,4, Eva V Gonçalves5,4, Mário Sousa1,2,5
1Unit for Multidisciplinary Research in Biomedicine, School of Medicine and Biomedical Sciences, University of Porto, Porto, Portugal.
Current Protocols
|June 4, 2026
Summary
This study presents an optimized MTT assay for measuring metabolic activity in human spermatozoa. The improved protocol ensures reproducibility and linearity, benefiting toxicology screening and fertility research.
Area of Science:
- Biochemistry
- Cell Biology
- Reproductive Science
Background:
- The MTT assay measures cell viability via oxidoreductase activity.
- Standard MTT protocols are unsuitable for suspension cells like spermatozoa.
- Existing methods yield variable and nonlinear data for sperm metabolic activity.
Purpose of the Study:
- To develop an optimized MTT assay for human spermatozoa.
- To establish a reproducible and linear method for assessing sperm metabolic activity.
- To adapt the protocol for toxicology screening and fertility research.
Main Methods:
- Optimized cell number and non-interference validation.
- Improved post-assay cell preservation and formazan solubilization.
- Developed a protocol compatible with standard microplate readers.
Main Results:
- Achieved a reproducible and linear MTT assay for spermatozoa.
- Quantified sperm metabolic activity with enhanced precision.
- Demonstrated adaptability to other suspension cell types.
Conclusions:
- The optimized MTT assay accurately measures human spermatozoa metabolic activity.
- This protocol supports applications in toxicology, fertility assessment, and bioenergetics research.
- The workflow is adaptable for various suspension cell types.
