Related Experiment Videos
Thiamine cardiotropism
V V Vinogradov1, A B Shneider, S B Senkevich
1Institute of Biochemistry, Academy of Sciences of the Belorussian SSR, Grodno University.
Insights
Vitamin B1 (thiamine) administration significantly reduced heart damage in rats with myocardial infarction. This vitamin B1 effect stems from enhanced cardiomyocyte resistance to ischemia and its antistressor properties.
Area of Science:
- Cardiology
- Biochemistry
- Pharmacology
Background:
- Myocardial infarction is a leading cause of mortality.
- Stress is a significant factor in the development of cardiopathy.
- Thiamine (Vitamin B1) is essential for cellular metabolism.
Purpose of the Study:
- To investigate the protective effects of thiamine on myocardial ischemia.
- To elucidate the mechanisms underlying thiamine's cardioprotective action.
Main Methods:
- Experimental myocardial infarction model in rats.
- Stereometric analysis of histological heart preparations.
- Emotional-painful stress model in rats.
Main Results:
- Thiamine administration (200 mg/kg) significantly reduced myocardial ischemic lesions.
- Vitamin B1 increased cardiomyocyte resistance to ischemia.
- Thiamine exhibited an antistressor action, mitigating stress-induced cardiopathy.
Conclusions:
- Thiamine provides cytoprotection against myocardial ischemia.
- The cardioprotective effects of thiamine are attributed to enhanced cellular resistance and antistressor properties, not direct cardiotropism.
Abstract:
Thiamine administration (200 mg/kg 2 hours before start of the experiment) substantially reduced the myocardial ischaemic lesion in a model of experimental myocardial infarction in the rat. As shown by stereometric analysis of histological heart preparations, the cytoprotective action of vitamin B1 is mediated by increased cardiomyocyte resistance towards ischaemia, i.e., through an adequate increase in the relative volume of the protection zone. Experiments on a model of emotional-painful stress in the rat show that the antiischaemic action of vitamin B1 cannot be explained by a specific cardiotropism of thiamine (the presence of thiamine phosphate buffer depots excludes the manifestation of coenzymatic effects of thiamine under given conditions) but by an antistressor action of thiamine resulting in exclusion of an important pathogenetic link in the mechanism of stress-conditioned cardiopathy.