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[Mechanisms of neuro-tropic disorders induced in skeletal muscles by botulinum toxin]
Abstract:
The relationship between activation of cell nucleus division and disturbances of electrogenesis of skeletal muscle fibers which had been paralyzed by botulinum toxin was studied in experiments on rats. On the 5th day after its intramuscular injection botulinum toxin evoked depolarization of muscle fibers and appearance of local responses in addition to break action potentials (AP) in most of the fibers. Inhibition of DNA synthesis by daily intraperitomeal injection of fluorouracil prevented the decreasing of rest membrane potentials and appearance of anode break AP.
Insights
Botulinum toxin paralyzes skeletal muscles by disrupting electrogenesis. Inhibiting DNA synthesis with fluorouracil prevents these muscle fiber electrical disturbances, preserving normal function.
Area of Science:
- Neuroscience
- Cell Biology
- Muscle Physiology
Context:
- Botulinum toxin (BTX) is known to cause paralysis by inhibiting neurotransmitter release.
- Skeletal muscle fibers undergo significant physiological changes following BTX injection.
- The interplay between cell division and muscle electrogenesis after BTX exposure is not fully understood.
Purpose:
- To investigate the relationship between cell nucleus division and electrogenesis disturbances in skeletal muscle fibers paralyzed by botulinum toxin.
- To determine the effect of inhibiting DNA synthesis on the electrophysiological properties of botulinum toxin-affected muscle fibers.
Summary:
- Experiments on rats showed that botulinum toxin injection led to muscle fiber depolarization and abnormal action potentials (APs) by the fifth day.
- Daily administration of fluorouracil, a DNA synthesis inhibitor, prevented the reduction in resting membrane potentials and the emergence of anode break APs.
- These findings suggest that cell division processes activated by botulinum toxin contribute to the observed electrogenesis disturbances.
Impact:
- This research provides insights into the cellular mechanisms underlying botulinum toxin-induced muscle dysfunction.
- Understanding the role of DNA synthesis in these disturbances could inform therapeutic strategies for conditions involving muscle paralysis.
- The study highlights a link between nuclear activity and the maintenance of skeletal muscle electrical stability.