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Absence of cyclic adenosine 3':5' monophosphate responsive element modulator expression at the spermatocyte arrest
W W Lin1, D J Lamb, L I Lipshultz
1Baylor College of Medicine, Houston, Texas, USA.
Objective:
To test the hypotheses that variations in the expression of adenosine 3':5' monophosphate (cAMP) responsive element modulator are found in human seminiferous epithelium in men with impaired testicular function and subsequent infertility and that variations in apoptosis frequency are associated with differential cAMP responsive element modulator expression in male infertility states.
Design:
Standard immunohistochemical staining using a rabbit polyclonal antibody against the tau isoform of the cAMP responsive element modulator protein was performed on 5-microM sections of Bouin's fixed, paraffin-embedded testicular tissue obtained from azoospermic or severely oligozoospermic men for routine clinical purposes. Histologic diagnosis was confirmed with computerized image analysis of Feulgen-stained sections.
Setting:
Tertiary male infertility referral center at a medical school.
Patient(S):
Forty-eight testis biopsies were performed in 38 azoospermic or severely oligozoospermic males.
Intervention(S):
Rabbit polyclonal cAMP responsive element modulator tau antibody was applied to the paraffin-embedded testis sections.
Main Outcome Measure(S):
Testis immunoreactivity to polyclonal cAMP responsive element modulator tau antibody and apoptotic indices.
Result(S):
Although cAMP responsive element modulator immunoreactivity was present in the round spermatid stage of meiosis in testis biopsy specimens showing normal spermatogenesis, spermatid maturation arrest, and hypospermatogenesis, there was complete absence of expression in biopsy specimens from patients with Sertoli cell only and spermatocyte maturation arrest states. In addition, significantly increased apoptotic indices were observed in the spermatocyte maturation arrest state in comparison with normal spermatogenesis and Sertoli cell only pattern.
Conclusion(S):
These data suggest that cAMP responsive element modulator may be important for spermatid development and a stage-specific regulator of human spermatogenesis. Absence of cAMP responsive element modulator may be a cause of testicular failure in various types of male infertility.
Insights
Variations in cAMP responsive element modulator expression are linked to male infertility. Its absence may cause testicular failure, impacting sperm development and human spermatogenesis.
Area of Science:
- Reproductive Biology
- Molecular Endocrinology
- Human Genetics
Background:
- Male infertility affects a significant portion of the reproductive-aged population.
- Understanding the molecular mechanisms underlying testicular dysfunction is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the expression of cAMP responsive element modulator (CREM) in the human seminiferous epithelium of infertile men.
- To determine the association between CREM expression patterns and apoptosis frequency in various male infertility states.
Main Methods:
- Immunohistochemical staining of testicular biopsies from azoospermic or oligozoospermic men using a polyclonal antibody against CREM tau isoform.
- Computerized image analysis of Feulgen-stained sections for histologic confirmation.
- Assessment of apoptotic indices in relation to CREM expression.
Main Results:
- CREM immunoreactivity was observed in round spermatids during normal spermatogenesis, spermatid maturation arrest, and hypospermatogenesis.
- Complete absence of CREM expression was noted in Sertoli cell-only and spermatocyte maturation arrest states.
- Significantly increased apoptotic indices were found in the spermatocyte maturation arrest group compared to normal spermatogenesis and Sertoli cell-only patterns.
Conclusions:
- CREM plays a vital role in spermatid development and acts as a stage-specific regulator of human spermatogenesis.
- The absence of CREM expression may contribute to testicular failure and male infertility.