Related Experiment Video
Updated: Jun 17, 2026
Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
Published on: August 6, 2014
Testicular toxicity and mechanisms of chlorotoluron compounds in the mouse
1Medical College of Nankai University, Tianjin, China, 300071.
Abstract:
ABSTRACT Previous studies have reported that chlorotoluron has adverse effects on male mice. Few studies, however, have investigated the mechanism of the action of these herbicides. The study of the effects of chlorotoluron and atrazine ingestion on male mice reproductive function during a critical developmental period, the peripubertal period, is reported here. Chlorotoluron and/or atrazine were administered by PO gavage to mice from day 27 to day 52. The decreased weight ratio of mouse testis to body weight resulted in a reduction in the relative testis weight. Histological study of testis showed that the seminiferous epithelium arrayed loosely and disorderedly, spermatogenic cells became shed, and fewer layers were formed. With the use of an electron microscope, it was noted that mitochondria in the seminiferous epithelium appeared vacuolated; karyotheca swelled and bent. In addition, the number of Sertoli cells was reduced, and part of the tight junction was destroyed. The results of the present study demonstrated that herbicides in all administrated doses caused detrimental changes in mice. The toxic effects of chlorotoluron were more potent than those of atrazine when administrated alone. Moreover, the two compounds have synergistic toxic effects with combination use. All dose paradigms induced degeneration and severe pathological changes in a manner of dose response.
Insights
This study shows that exposure to herbicides chlorotoluron and atrazine during the peripubertal period causes significant damage to male mice reproductive systems. Chlorotoluron was more toxic than atrazine, and combined use showed synergistic harmful effects.
Area of Science:
- Environmental Toxicology
- Reproductive Toxicology
- Mammalian Toxicology
Background:
- Previous research indicates chlorotoluron adversely affects male mice.
- Limited studies have explored the mechanisms behind herbicide toxicity.
- The peripubertal period is a critical window for reproductive development.
Purpose of the Study:
- To investigate the effects of chlorotoluron and atrazine on male mice reproductive function.
- To examine the impact of these herbicides during the peripubertal developmental stage.
- To elucidate the mechanisms of reproductive toxicity induced by these herbicides.
Main Methods:
- Male mice were administered chlorotoluron and/or atrazine via oral gavage from day 27 to day 52.
- Relative testis weight was measured.
- Testicular histology and electron microscopy were performed to assess cellular and subcellular changes.
Main Results:
- Herbicide administration led to reduced relative testis weight.
- Histological examination revealed disordered seminiferous epithelium, cell shedding, and reduced cell layers.
- Electron microscopy showed mitochondrial vacuolation, karyotheca swelling, reduced Sertoli cells, and damaged tight junctions.
- Both herbicides caused dose-dependent detrimental and pathological changes.
- Chlorotoluron exhibited greater toxicity than atrazine when administered alone.
- Combined use of chlorotoluron and atrazine demonstrated synergistic toxic effects.
Conclusions:
- Chlorotoluron and atrazine exposure during the peripubertal period induces significant reproductive toxicity in male mice.
- The observed toxic effects include reduced testis weight, disrupted spermatogenesis, and cellular damage.
- Chlorotoluron is more potent than atrazine, and their combination results in synergistic toxicity, highlighting the risks of combined herbicide exposure.
Related Concept Videos
01:23Toxicity Testing in Animals
01:26Toxic Reactions: Overview
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...