Related Experiment Videos
Superoxide dismutase in human sperm suspensions: relationship with cellular composition, oxidative stress, and sperm
R J Aitken1, D W Buckingham, A Carreras
1MRC Reproductive Biology Unit, Edinburgh, Scotland, UK.
Free Radical Biology & Medicine
|January 1, 1996
Summary
High levels of superoxide dismutase (SOD) in human sperm are linked to impaired function and damage, contrary to its protective role. This suggests issues in sperm development rather than enzyme deficiency.
Area of Science:
- Reproductive Biology
- Biochemistry
- Spermatozoa Function
Background:
- Superoxide dismutase (SOD) is typically viewed as protective.
- Its role in human sperm function requires further investigation.
- Sensitive assays for SOD activity in sperm are now available.
Purpose of the Study:
- To investigate the correlation between SOD activity and human sperm function.
- To explore the relationship between SOD levels and peroxidative damage in spermatozoa.
- To identify potential implications of high SOD activity in male infertility.
Main Methods:
- Analysis of SOD activity in human sperm preparations using sensitive techniques.
- Fractionation of spermatozoa based on Percoll density gradients.
- Assessment of sperm movement characteristics, oocyte fusion capacity, and peroxidative damage markers.
Main Results:
- Defective spermatozoa exhibited three times higher SOD activity than competent sperm.
- SOD activity was negatively correlated with sperm motility and oocyte fusion.
- High SOD activity was positively associated with peroxidative damage and cytoplasmic markers like CK and G-6-PDH.
Conclusions:
- Elevated SOD levels in human sperm are associated with impaired function, not deficiency.
- This impairment is linked to susceptibility to hydrogen peroxide (H2O2) and the role of superoxide (O2.-) in normal function.
- High SOD may indicate spermatogenesis errors, including germ cell exfoliation and retained cytoplasm.