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Revisiting the human seminiferous epithelium cycle
F Nihi1, M L M Gomes1,2, F A R Carvalho1
1Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), CEP 31.270-901 Belo Horizonte, Brazil.
Human Reproduction (Oxford, England)
|April 4, 2017
Summary
High-resolution light microscopy (HRLM) accurately identifies all testicular germ cells and precisely stages the human seminiferous epithelium cycle (SEC). This method provides a reliable reference for human spermatogenesis research and clinical andrology.
Area of Science:
- Reproductive Biology
- Cell Biology
- Histology
Background:
- Conventional histological methods for human germ cell identification and seminiferous epithelium cycle (SEC) staging have limitations.
- Incomplete morphological identification and random germ cell distribution hinder accurate morphofunctional evaluations of testicular parenchyma.
Purpose of the Study:
- To determine if all testicular germ cell types can be accurately identified and unambiguously distributed within the stages of the human seminiferous epithelium cycle (SEC).
- To establish a reliable reference for staging human spermatogenesis using advanced microscopy.
Main Methods:
- Utilized high-resolution light microscopy (HRLM) for improved visualization of germ cell morphology.
- Analyzed testicular tissue from adult and elderly donors with normal spermatogenesis.
- Employed glutaraldehyde fixation and araldite epoxy resin embedding for morphological analyses.
Main Results:
- HRLM enabled reliable identification of all germ cells (spermatogonia, spermatocytes, spermatids) based on nuclear features and acrosomal development.
- Precisely grouped germ cells into six well-defined SEC stages, redefining stage limits.
- Established a more reliable method for determining the SEC in humans.
Conclusions:
- HRLM offers a valuable tool for accurately identifying germ cells and staging the human SEC.
- This refined methodology can aid research in testicular diseases and infertility conditions.
- The findings provide a new focus on germ cell morphology and development during human spermatogenesis.