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Positive correlation between the level of protein-carboxyl methylase in spermatozoa and sperm motility
Abstract:
Levels of protein-carboxyl methylase (PCM) activity were measured in spermatozoa from infertile patients with less than 50% sperm motility and compared with those of normal fertile controls. When spermatozoa were washed by a standard centrifugation procedure, the level of PCM activity in a subgroup of patients with sperm motility ranging from 0% and 20% (24.0 +/- 5.2 pmol/mg protein, mean +/- standard error of the mean) was significantly different from that of controls (35.9 +/- 2.3 pmol/mg). However, when the entire population of patients with sperm motility ranging from 0% to 50% (32.6 +/- 6.2 pmol/mg) was compared with controls, no significant difference was observed in sperm PCM levels. With this standard washing procedure no significant relationship (r = 0.28; P greater than 0.05) between sperm PCM activity and motility was observed. By contrast, when spermatozoa were washed on a Percoll gradient, to eliminate other cellular elements, both groups of patients with 0% to 20% (14.6 +/- 2.5 pmol/mg) and with 0% to 50% (21.5 +/- 2.4 pmol/mg) sperm motility had sperm PCM levels significantly lower than that of controls (34.7 +/- 3.6). A highly significant relationship (r = 0.78; P less than 0.001) was observed between the levels of sperm PCM activity and motility.
Insights
Protein-carboxyl methylase (PCM) activity is significantly lower in spermatozoa from infertile men with low motility when using Percoll gradients. This suggests PCM levels correlate with sperm function and could be a biomarker for male infertility.
Area of Science:
- Reproductive Biology
- Biochemistry
Background:
- Protein-carboxyl methylase (PCM) is an enzyme involved in cellular processes.
- Sperm motility is a key indicator of male fertility.
- Investigating enzyme activity in spermatozoa can provide insights into male reproductive health.
Purpose of the Study:
- To investigate the relationship between protein-carboxyl methylase (PCM) activity and sperm motility in infertile men.
- To determine if PCM levels can serve as a biomarker for male infertility.
Main Methods:
- Spermatozoa were collected from infertile patients with low motility (<50%) and fertile controls.
- Protein-carboxyl methylase (PCM) activity was measured using standard centrifugation and Percoll gradient washing methods.
- Statistical analysis was performed to compare PCM levels and correlate them with sperm motility.
Main Results:
- Standard centrifugation showed no significant difference in PCM levels between infertile patients and controls when considering motility from 0-50%.
- However, a subgroup with 0-20% motility showed significantly lower PCM activity compared to controls using standard centrifugation.
- Percoll gradient washing revealed significantly lower PCM levels in infertile patients (0-20% and 0-50% motility) compared to controls.
- A strong positive correlation (r=0.78) was found between PCM activity and sperm motility when using Percoll gradients.
Conclusions:
- Percoll gradient washing is a more effective method for assessing sperm PCM activity in relation to motility.
- Significantly reduced sperm PCM activity is associated with decreased sperm motility in infertile men.
- Sperm PCM levels may be a valuable biomarker for diagnosing male infertility.