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Oxidative stress markers and sperm structural integrity regarding semen processing methods followed by
Ana Paula de Souza Kussler1,2, Ivan Cunha Bustamante Filho3, Elisa Negri1
1Programa de Pós-Graduação em Ciências da Saúde, Ginecologia e Obstetrícia, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
Andrology
|June 16, 2025
Summary
Density gradient processing better preserves sperm quality after cryopreservation than washing. This method reduces oxidative damage and maintains acrosomal and mitochondrial integrity, offering a superior approach for sperm preservation.
Area of Science:
- Reproductive biology
- Sperm cryopreservation
- Sperm processing techniques
Background:
- Seminal cryopreservation leads to significant sperm damage.
- Alternative preservation methods are needed.
- This study compares washing and density gradient processing effects on sperm.
Purpose of the Study:
- To compare the effects of washing and density gradient processing on sperm quality after cryopreservation.
- To evaluate oxidative damage, acrosomal integrity, and mitochondrial potential.
Main Methods:
- Sperm samples from 26 normozoospermic patients were divided into three groups: raw, washed, and density gradient processed.
- Samples were cryopreserved for at least 2 weeks.
- Flow cytometry assessed reactive oxygen species (ROS), plasma membrane peroxidation, acrosome integrity, and mitochondrial potential before and after thawing.
Main Results:
- Density gradient processing reduced ROS production and oxidized cells compared to washing.
- Washing resulted in higher acrosomal damage, while gradient samples maintained better integrity post-thaw.
- Gradient processing led to lower plasma membrane instability and higher mitochondrial potential post-thaw compared to raw and washed samples.
Conclusions:
- Cryopreservation significantly damages sperm acrosomes and mitochondria.
- The density gradient method selects higher-quality spermatozoa, preserving functional advantages after thawing in normozoospermic patients.
