Related Experiment Video
Updated: Jun 26, 2026
An In Vivo Method to Study Mouse Blood-Testis Barrier Integrity
Published on: December 2, 2018
Microcystin extracts induce ultrastructural damage and biochemical disturbance in male rabbit testis
1Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, The Chinese Academy of Sciences, People's Republic of China.
Abstract:
In the present research, the changes of ultrastructures and biochemical index in rabbit testis were examined after i.p. injection with 12.5 microg/kg microcystin (MC) extracts. Ultrastructural observation showed widened intercellular junction, distention of mitochondria, endoplasmic reticulum, and Golgi apparatus. All these changes appeared at 1, 3, and 12 h, but recovered finally. In biochemical analyses, the levels of lipid peroxidation (MDA) and H(2)O(2) increased significantly at 1 h, indicating MC-caused oxidative stress. Finally, H(2)O(2) decreased to the normal levels, while MDA remained at high levels. The antioxidative enzymes (CAT, SOD, GPx, GST) and antioxidants (GSH) also increased rapidly at 1 h, demonstrating a quick response of the defense systems to the oxidative stress. Finally, the activity of CAT, SOD, and GPX recovered to the normal level, while the activity of GST and the concentration of GSH remained at a high level. This suggests that the importance of MCs detoxification by GST via GSH, and the testis of rabbit contained abundant GSH. The final recovery of ultrastructure and some biochemical indexes indicates that the defense systems finally succeeded in protecting the testis against oxidative damage. In conclusion, these results indicate that the MCs are toxic to the male rabbit reproductive system and the mechanism underlying this toxicity might to be the oxidative stress caused by MCs. Although the negative effects of MCs can be overcome by the antioxidant system of testis in this study, the potential reproductive risks of MCs should not be neglected because of their wide occurrence.
Insights
Microcystins (MCs) cause oxidative stress and damage to rabbit testes, affecting reproductive health. However, the rabbit
Area of Science:
- Reproductive toxicology
- Environmental health
- Biochemistry
Background:
- Microcystins (MCs) are potent toxins produced by cyanobacteria, posing risks to aquatic ecosystems and human health.
- Exposure to MCs has been linked to various adverse health effects, including potential reproductive toxicity.
Purpose of the Study:
- To investigate the effects of microcystin (MC) exposure on the ultrastructure and biochemical indices of rabbit testes.
- To elucidate the underlying mechanisms of MC toxicity in the male reproductive system, focusing on oxidative stress.
- To assess the capacity of the testicular antioxidant system to counteract MC-induced damage.
Main Methods:
- Intraperitoneal injection of microcystin (MC) extracts into rabbits at a dose of 12.5 microg/kg.
- Ultrastructural examination of testicular tissue using electron microscopy.
- Biochemical analysis of lipid peroxidation (MDA), hydrogen peroxide (H2O2), antioxidant enzymes (CAT, SOD, GPx, GST), and glutathione (GSH) levels.
Main Results:
- MC exposure induced ultrastructural damage in rabbit testes, including widened intercellular junctions and mitochondrial/endoplasmic reticulum/Golgi apparatus distention.
- Significant increases in lipid peroxidation (MDA) and hydrogen peroxide (H2O2) levels were observed, indicating MC-induced oxidative stress.
- The testicular antioxidant system, including enzymes (CAT, SOD, GPx, GST) and glutathione (GSH), showed a rapid increase in response to oxidative stress, with GST and GSH remaining elevated, suggesting a key role in MC detoxification.
Conclusions:
- Microcystins are toxic to the male rabbit reproductive system, primarily through the induction of oxidative stress.
- The rabbit testicular antioxidant system, particularly involving glutathione S-transferase (GST) and glutathione (GSH), plays a crucial role in mitigating MC-induced damage.
- Despite the observed recovery, the potential reproductive risks associated with widespread microcystin occurrence warrant further attention.
