Unraveling a Subgroup of Men With Unexplained Male Infertility—Men With Normogonadotropic Nonobstructive Azoospermia
Authors' conclusion
The missing FSH upregulation in NNOA might be due to a testicular malfunction, as both FSH and testosterone were normal and NNOA spermatogenesis differed only after meiosis. Two explanations are possible: NNOA represents a phenotype in which spermatogenesis fails-different from NOA-only at the postmeiotic level, leaving FSH regulation unaffected, or the same mechanism underlies both NNOA and NOA, but the groups are at different stages of progression of the same disorder.
Study context
- Population
- Azoospermic men without obstruction but with normal follicle-stimulating hormone (FSH) levels, compared with men with hypergonadotropic nonobstructive azoospermia (NOA) and normozoospermic men
- Participants
- 79 / 87 / 88
- Exposure
- Normogonadotropic NOA vs hypergonadotropic NOA vs normozoospermic men
- Normogonadotropic nonobstructive azoospermic (NNOA)n = 79
- NOAn = 87
- Normozoospermicn = 88reference
- Outcome
- Testicular phenotype by histological subgroup (hypospermatogenesis, spermatogenic arrest, Sertoli cell only, tubular atrophy)
Methodological detailsSomatic, endocrine and testicular parameters analysed; testicular cell composition by flow cytometric ploidy analysis
- Somatic, endocrine and testicular parameters analysed; testicular cell composition by flow cytometric ploidy analysis
Main finding
As reported in the abstract
- NNOA men produced more elongated spermatids and showed higher sperm retrieval than NOA men
- Testicular tissue composition (flow cytometry ploidy analysis) differed between NNOA and NOA only after meiosis
Observational data: associations, not effects.
Original publication
Unraveling a Subgroup of Men With Unexplained Male Infertility—Men With Normogonadotropic Nonobstructive Azoospermia. J Clin Endocrinol Metab. Published 15 April 2025. doi:10.
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