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[The acute toxic effects of microcystin LR in SD rats]
Zhanying Zhang1, Suya Kang, Chuanwei Chen
1Institute of Preventive Medicine, School of Public Health, Fudan University, Shanghai 200032, China.
Objective:
To assess Microcystin LR (MCLR)-induced acute toxic effects in male Sprague-Dawley rats.
Methods:
The rats were injected with MCLR intraperitoneally in different doses for different days. The organs and serum with rats were collected at 1 and 7 days after injection, and 7 days after the final injection (total 14 days). Pathological and enzymatic changes were observed.
Results:
The rats injected with 122 microg/kg MCLR showed myocardial cells damage including pyknosis, plasma dissolve and myofibrilla (pls check with dictionary) necrosis in the heart muscles after 24 hours. At the same time, the activities of serum glutamate-oxaloacetate transaminase (GOT), lactate dehydrogenase (LDH) and creatine phosphonase (CPK) were higher than these in the other groups (P < 0.01). The kidney was also damaged, kidney cell degeneration, and the increase of blood creatine (BCr) and blood urea nitrogen (BUN) were also seen. In liver pathological study, liver cell hemorrhage, degeneration and/or necrosis was observed. In serum the activities of glutamate-pyruvate transaminase (GPT), alkaline phosphatase (LDH) and GOT were higher than these in the other groups (P < 0.01).
Conclusion:
These results suggested that MCLR can injure the heart, kidney and the liver in SD rats, and there is a dose-response relationship between MCLR and the toxic effect.
Insights
Microcystin LR (MCLR) causes acute toxic effects in male Sprague-Dawley rats, damaging the heart, kidney, and liver. Higher MCLR doses led to more severe organ damage and elevated enzyme levels, indicating a clear dose-response relationship.
Area of Science:
- Environmental Toxicology
- Hepatology
- Nephrology
- Cardiology
Background:
- Microcystin LR (MCLR) is a potent cyanotoxin with significant public health implications.
- Understanding the acute toxicological effects of MCLR is crucial for risk assessment and management.
Purpose of the Study:
- To evaluate the acute toxic effects of Microcystin LR (MCLR) exposure in male Sprague-Dawley rats.
- To determine the dose-response relationship between MCLR exposure and organ-specific toxicity.
Main Methods:
- Male Sprague-Dawley rats were administered varying doses of MCLR via intraperitoneal injection.
- Organ and serum samples were collected at 1, 7, and 14 days post-injection for pathological and enzymatic analysis.
- Key biochemical markers and histopathological changes in the heart, kidney, and liver were assessed.
Main Results:
- MCLR exposure induced myocardial cell damage, including necrosis, in rat hearts.
- Significant increases in serum enzyme activities (GOT, LDH, CPK, GPT) and markers of kidney damage (BCr, BUN) were observed.
- Hepatotoxicity was evident, with observed liver cell hemorrhage, degeneration, and necrosis.
Conclusions:
- MCLR is acutely toxic to the heart, kidney, and liver in Sprague-Dawley rats.
- A clear dose-response relationship exists between MCLR exposure levels and the severity of observed toxic effects.
- These findings highlight the critical need for monitoring and controlling MCLR contamination in water sources.