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Light and electron microscopic observation of experimental palytoxin poisoning in mice
1Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, Japan.
Abstract:
The effects of palytoxin on young male ICR mice were compared with the combined effects of palytoxin and ouabain or those of several cations as well as the effects of potassium. The target organs of palytoxin were the heart, kidney, pancreas, small intestine and liver. Pathomorphological changes of the heart induced by palytoxin were similar those of a lethal dose of KC1. However, the KC1-treated animals did not show any changes in the kidney. Mice given ouabain at doses up to 5 mg/kg also showed similar injuries in proximal as well as distal convoluted urinary tubules, while the heart of mice given ouabain at the same doses showed no discernible morphological changes. Ouabain 5 mg/kg did not influence the severity of injuries both in the heart and kidney induced by palytoxin at 4 micrograms/kg. Therefore, it may be assumed that palytoxin poisoning is a symptom-complex of hyperkalemia and causes a profound inhibition of Na+, K(+)-ATPase.
Insights
Palytoxin causes heart and kidney damage in mice, mimicking hyperkalemia. This suggests palytoxin profoundly inhibits Na+, K+-ATPase, impacting cellular ion balance.
Area of Science:
- Toxicology
- Cellular Physiology
Background:
- Palytoxin is a potent marine toxin with complex physiological effects.
- Understanding its mechanism of action is crucial for treating poisoning.
Purpose of the Study:
- To investigate the effects of palytoxin on young male ICR mice.
- To compare palytoxin's effects with potassium chloride (KC1) and ouabain.
- To elucidate the cellular mechanisms underlying palytoxin-induced toxicity.
Main Methods:
- Administration of palytoxin, KC1, and ouabain to mice.
- Pathomorphological examination of target organs (heart, kidney, pancreas, small intestine, liver).
- Comparative analysis of toxicological and physiological effects.
Main Results:
- Palytoxin induced heart and kidney damage, similar to KC1-induced cardiac changes but without kidney alterations.
- Ouabain caused kidney tubule injuries but not cardiac changes.
- Ouabain did not modify palytoxin-induced heart and kidney injuries.
Conclusions:
- Palytoxin poisoning may manifest as a symptom-complex of hyperkalemia.
- Palytoxin likely causes profound inhibition of Na+, K+-ATPase, disrupting ion transport.