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Effect of age, clonidine or propranolol on behavioral toxicity induced with digitoxin in mice
Abstract:
In three experiments, behavioral toxicity induced by 5 different dose levels of digitoxin was investigated in mice that were treated with either clonidine or propranolol or were either young (70-140 days), middle aged (240-260) or old (450-600). Observed on four drug-induced behavior categories, it was found that both clonidine and propranolol attenuated the toxic effects of relatively low dose levels of digitoxin, while at higher digitoxin dose levels only propranolol was able to reduce significantly the ED50 and the LD50. The results were discussed in terms of adrenergic mechanisms mediating digitoxin toxicity. Aged mice were found to be the least and middle aged the most resistant to the toxic effects of digitoxin.
Insights
Clonidine and propranolol reduce digitoxin toxicity in mice. Propranolol was more effective at higher doses, and middle-aged mice showed the most resistance to digitoxin toxicity.
Area of Science:
- Pharmacology
- Toxicology
- Neuroscience
Background:
- Digitoxin is a cardiac glycoside with a narrow therapeutic index.
- Understanding factors influencing digitoxin toxicity is crucial for safe clinical use.
- Adrenergic mechanisms may play a role in digitoxin's toxic effects.
Purpose of the Study:
- To investigate the effects of clonidine and propranolol on digitoxin-induced behavioral toxicity in mice.
- To examine how age influences susceptibility to digitoxin toxicity.
- To explore the role of adrenergic pathways in digitoxin toxicity.
Main Methods:
- Three experiments were conducted using 5 dose levels of digitoxin.
- Mice were treated with either clonidine or propranolol.
- Mice were categorized by age: young (70-140 days), middle-aged (240-260 days), and old (450-600 days).
- Behavioral toxicity was assessed across four drug-induced behavior categories.
Main Results:
- Both clonidine and propranolol attenuated digitoxin toxicity at lower doses.
- Propranolol significantly reduced the median effective dose (ED50) and median lethal dose (LD50) at higher digitoxin doses.
- Middle-aged mice exhibited the highest resistance to digitoxin toxicity, while aged mice were the least resistant.
Conclusions:
- Adrenergic mechanisms are implicated in mediating digitoxin toxicity.
- Propranolol demonstrates significant protective effects against digitoxin toxicity, particularly at higher doses.
- Age influences susceptibility to digitoxin, with middle-aged mice being the most resistant.