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ATP and ADP content of human ejaculated spermatozoa. II. Time-dependent changes after ejaculation
International Journal of Andrology
|December 1, 1982
Summary
Adenosine triphosphate (ATP) levels in ejaculated sperm significantly decrease over time, as shown by a mathematical model. Adenosine diphosphate (ADP) levels varied and did not show significant changes, with no clear link found between ATP decline and sperm motility or viability loss.
Area of Science:
- Reproductive biology
- Biochemistry
- Spermatozoa physiology
Background:
- Spermatozoa require adequate energy for motility and viability.
- Adenosine triphosphate (ATP) is a key energy source for sperm function.
- Understanding energy metabolism dynamics is crucial for assessing sperm quality.
Purpose of the Study:
- To measure adenosine triphosphate (ATP) and adenosine diphosphate (ADP) levels in ejaculated spermatozoa over time.
- To analyze the relationship between time, ATP/ADP levels, and sperm motility/viability.
- To develop a mathematical model for ATP degradation patterns.
Main Methods:
- Ejaculated semen samples from 7 donors were analyzed within 24 hours.
- Semen samples were stored at room temperature.
- Bioluminescent assays were used to measure ATP and ADP content.
- Sperm motility and viability were assessed at prefixed time points.
Main Results:
- ATP levels exhibited a significant time-dependent decrease (P < 0.001), accurately modeled mathematically.
- ADP levels showed non-significant, variable decreases among subjects over time.
- The relationship between the percentage decrease in ATP and the percentage decrease in sperm motility or viability was non-linear.
Conclusions:
- Spermatozoa demonstrate a significant, predictable decline in ATP over time.
- ADP levels are less indicative of time-dependent changes in sperm quality.
- Current models cannot fully explain the complex relationship between ATP depletion and loss of sperm motility/viability.