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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
Published on: February 6, 2018
Gonocyte development in rats: proliferation, distribution and death revisited
Camila Zogbi1, Renato B Tesser, Giselly Encinas
1Laboratory of Developmental Biology, Department of Morphology and Genetics, Federal University of Sao Paulo (UNIFESP), Rua Botucatu, 740, Ed. Leitao da Cunha, 2° andar, Sao Paulo, SP CEP: 04023-900, Brazil.
Histochemistry and Cell Biology
|April 25, 2012
Summary
Rat gonocytes redistribute within seminiferous cords before differentiating into spermatogonia, with mitosis resuming around 8 days postpartum. This study clarifies early germ cell development and spermatogenesis initiation.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Cell Biology
Background:
- Spermatogonial stem cells initiate sperm production.
- Gonocyte differentiation into spermatogonia is not well understood.
- Early germ cell development is crucial for male fertility.
Purpose of the Study:
- To investigate rat gonocyte proliferation, apoptosis, distribution, and differentiation into spermatogonia.
- To understand the timing and mechanisms of early germ cell development post-birth.
- To identify key molecular markers associated with gonocyte differentiation.
Main Methods:
- Collected rat testes at various developmental stages (19 dpc, 1-15 dpp).
- Utilized morphological analysis, TUNEL, p53, cleaved caspase 3, Ki67, MVH, OCT4, and DBA labeling.
- Measured seminiferous cord length and gonocyte numerical density.
Main Results:
- Gonocyte numbers per section decreased from 1-5 dpp, but total cell numbers remained constant, indicating redistribution.
- No apoptotic gonocytes were detected in the first week postpartum.
- Proliferating germ cells and spermatogonia emerged around 8 dpp, coinciding with OCT4 upregulation.
Conclusions:
- Gonocytes redistribute along growing seminiferous cords before differentiating.
- Mitosis resumes and spermatogonia emerge concurrently with OCT4 upregulation.
- This study elucidates the fate and differentiation pathway of early postnatal germ cells.
