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Morphological alterations in cultured neuromuscular tissue induced by two anesthetic agents
1Dept. of Virology, Israel Institute for Biological Research, Ness-Ziona.
Abstract:
A diversity of pathogenic effects was observed in two complementary culture systems following their exposure to the anesthetic agents. Thiopental sodium and ketamine hydrochloride. The cytotoxic effects of both agents in these two culture types were reversible and dose-related. In organotypic spinal cord slice cultures, thiopental sodium caused general toxicity but no demyelination, while ketamine hydrochloride induced, to a varied extent, damage of the myelin sheath and degeneration of mitochondria into multilamellar bodies. In autologous nerve-muscle co-cultures both anaesthetic agents caused the arrest of muscle contractions. However, when added to skeletal muscle cultures, the drugs differed in their effect. Thiopental sodium did not inhibit spontaneous muscle contractions indicating, as in the case of Tubocurarine, a direct effect of the drug on the neuromuscular junction. Ketamine hydrochloride, in contrast, arrested spontaneous muscle contractions, implying that it did not directly affect the neuromuscular synapse.
Insights
Anesthetic agents thiopental sodium and ketamine hydrochloride showed dose-related cytotoxic effects. Ketamine hydrochloride caused myelin damage and mitochondrial changes, while thiopental sodium had general toxicity in nerve cultures.
Area of Science:
- Neuroscience
- Toxicology
- Pharmacology
Background:
- Anesthetic agents are widely used in medical procedures.
- Understanding their potential neurotoxic effects is crucial for patient safety.
- Differential effects of anesthetics on neural tissues require detailed investigation.
Purpose of the Study:
- To compare the pathogenic effects of thiopental sodium and ketamine hydrochloride.
- To evaluate the dose-related and reversible nature of anesthetic cytotoxicity.
- To investigate the distinct impacts of these anesthetics on spinal cord and nerve-muscle cultures.
Main Methods:
- Utilizing organotypic spinal cord slice cultures.
- Employing autologous nerve-muscle co-cultures.
- Assessing cytotoxic effects and muscle contraction responses to varying anesthetic concentrations.
Main Results:
- Both anesthetics exhibited reversible, dose-dependent cytotoxicity.
- Ketamine hydrochloride induced myelin sheath damage and mitochondrial alterations in spinal cord cultures.
- Thiopental sodium caused general toxicity without demyelination; both agents arrested muscle contractions in co-cultures, but thiopental sodium did not inhibit spontaneous contractions in skeletal muscle cultures.
Conclusions:
- Thiopental sodium and ketamine hydrochloride possess distinct neurotoxic profiles.
- Ketamine hydrochloride appears to directly impact myelin and mitochondria, while thiopental sodium's primary effect in muscle cultures is at the neuromuscular junction.
- These findings highlight the differential neurotoxicity of common anesthetic agents.