Related Experiment Videos
Further observations on carbendazim-induced abnormalities of spermatid morphology in rats
1Department of Veterinary Anatomy, Miyazaki University, Japan. a0d101u@cc.miyazaki-u.ac.jp
Abstract:
The effects of a microtubule poison, carbendazim, on rat spermiogenesis were examined for abnormalities of nuclei, acrosome and manchette in round and elongating spermatids in Stages VII-XII on days 7.5, 9.5, 10.0 and 10.5 post-treatment using routine electron microscopy. Spermatid nuclear abnormalities were observed in Stages IX-XI on day 9.5 and at greater post-treatment intervals. Nuclear abnormalities included nuclear distortions, various types of nuclear invaginations and abnormal positioning of the modified nuclear envelope. Acrosomal abnormalities were noted on day 7.5 and at greater intervals. Discontinuous, multiple granular and fragmentary acrosomes were observed in Stages VII-XI. In addition, spermatids with complete absence of acrosome (acrosome-deficient spermatids) were observed in Stages VII-X. Poorly-formed and absent ectoplasmic specializations were seen in the cytoplasm of Sertoli cells next to the acrosome-deficient spermatids. A major abnormality of the manchette was irregular positioning of the manchette microtubules in steps 9-11 spermatids on day 9.5 and at greater intervals, which resulted in nuclear invagination. The results indicate that carbendazim induces abnormalities in spermatid morphology that are common to those reported in testes treated with several chemical compounds and in testes of mutant animals.
Insights
Carbendazim, a microtubule poison, causes significant abnormalities in rat sperm development, affecting nuclei, acrosomes, and microtubule structures. These findings highlight carbendazim
Area of Science:
- Reproductive Biology
- Toxicology
- Cell Biology
Background:
- Spermiogenesis is a complex process involving precise morphological changes in spermatids.
- Microtubules play a critical role in shaping the sperm nucleus and acrosome.
- Carbendazim is a known microtubule poison with potential reproductive toxicity.
Purpose of the Study:
- To investigate the effects of carbendazim on rat spermiogenesis.
- To identify specific abnormalities in spermatid nuclei, acrosomes, and manchettes.
Main Methods:
- Routine electron microscopy was used to examine rat spermatids.
- Spermatids in Stages VII-XII were analyzed at various post-treatment intervals (7.5, 9.5, 10.0, 10.5 days).
Main Results:
- Carbendazim induced nuclear abnormalities including distortions and invaginations.
- Acrosomal abnormalities, such as fragmentation and absence, were observed.
- Manchette defects, including irregular microtubule positioning, led to nuclear invaginations.
Conclusions:
- Carbendazim disrupts normal spermiogenesis by causing significant spermatid morphological abnormalities.
- These carbendazim-induced defects are comparable to those seen with other chemical agents and in mutant animals.