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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
Published on: February 6, 2018
Immunohistochemical study of rat spermatogenesis after toluene-inhalation
Akiko Ishigami1, Itsuo Tokunaga, Shin-ichi Kubo
1Department of Forensic Medicine, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto, Tokushima 770-8503, Japan.
Abstract:
After prolonged toluene-inhalation (for 20 days) at the common abuse density (1500 ppm for 4 h per day), the effect of toluene on spermatogenesis in rats was investigated. Body weight was significantly decreased in the toluene group (P < 0.05). However, the weights of the testis and epididymis were maintained. To confirm whether the toluene-inhalation influences testis and epididymis as a stress factor; anti-70kD heat-shock protein (HSP70) and c-fos gene product (c-Fos) were observed. To observe the change of the cell division and the proliferation in spermatogenesis, proliferating cell nuclear antigen (PCNA) were stained immunohistochemically, and apoptosis was also detected. There was no positive immunoreactivity for HSP70 or c-Fos. There was no significant difference in the PCNA-expression in both groups. It was considered that toluene-inhalation did not have a clear influence in the division of spermatogonium and spermatocytes. On in situ apoptosis detection, slightly enhanced signals were observed in the toluene-inhalation groups. This might have some influence on meiosis from spermatocyte to spermatid. However, in toluene-inhalation rats exposed to a common abuse density, it was considered that spermatogenesis was well maintained and not apparently damaged.
Insights
Prolonged toluene inhalation in rats did not significantly damage spermatogenesis. While body weight decreased, reproductive organ weights and cell proliferation markers remained stable, indicating resilience.
Area of Science:
- Toxicology
- Reproductive Biology
- Cell Biology
Background:
- Toluene is a common solvent with potential neurotoxic and reproductive effects.
- Understanding toluene's impact on male reproductive function is crucial for public health.
- Spermatogenesis is a complex process sensitive to environmental insults.
Purpose of the Study:
- To investigate the effects of prolonged toluene inhalation on rat spermatogenesis.
- To assess toluene's potential as a stressor on the testes and epididymis.
- To evaluate toluene's impact on cell division and apoptosis during sperm development.
Main Methods:
- Rats were exposed to toluene (1500 ppm, 4 h/day for 20 days).
- Body weight, testis, and epididymis weights were measured.
- Immunohistochemistry was used to detect heat-shock protein 70 (HSP70), c-Fos, and proliferating cell nuclear antigen (PCNA).
- In situ apoptosis detection was performed.
Main Results:
- Toluene inhalation significantly decreased body weight but maintained testis and epididymis weights.
- No significant changes in HSP70, c-Fos, or PCNA expression were observed.
- Slightly enhanced apoptosis signals were detected, potentially affecting meiosis.
Conclusions:
- Toluene inhalation at abuse densities did not apparently damage overall spermatogenesis in rats.
- While minor apoptotic changes occurred, key reproductive parameters were maintained.
- Further research may explore subtle effects on later meiotic stages.
