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Urethane anesthesia produces selective damage in the piriform cortex of the developing brain
1VA Greater Los Angeles Healthcare System, West Los Angeles Healthcare Center, Building 114, Rm. 137, 11301 Wilshire Blvd., Los Angeles, CA 90073, USA. kthompso@ucla.edu
Abstract:
The potential induction of neuronal death by neuroactive drugs at specific stages of embryonic or postnatal development is a serious concern in treating brain disease. Recent evidence indicates that NMDA antagonists, GABA agonists, ethanol and some anesthetics can all produce massive neuronal cell loss at critical times during development. We show here that the anesthetic urethane, once used clinically, produces a selective lesion of the piriform cortex, a region not previously implicated in such toxicity, in the developing brain. Young rats were injected with urethane at 1, 2, 3, and 4 weeks of age and brain damage was measured 1-4 days later. We found that urethane produces a large lesion in subfields of the piriform cortex and that the damage is most severe in 2 week-old animals. These data, together with other recent reports, show that there are multiple neuronal death-inducing pathways in the developing nervous system. It will be important to determine if anesthetics used in pregnant women and young children may have similar effects.
Insights
The anesthetic urethane causes significant brain damage, specifically in the piriform cortex, in young rats. This neurotoxicity highlights risks of developmental neurotoxicity from certain anesthetics.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Neuroactive drugs can induce neuronal death during critical developmental periods.
- Existing evidence implicates NMDA antagonists, GABA agonists, ethanol, and some anesthetics in developmental neurotoxicity.
- The piriform cortex's vulnerability to such toxicity has not been previously established.
Purpose of the Study:
- To investigate the neurotoxic effects of the anesthetic urethane on the developing rat brain.
- To determine if urethane causes selective damage to specific brain regions during early life.
- To assess the age-dependency of urethane-induced neurotoxicity.
Main Methods:
- Young rats (1, 2, 3, and 4 weeks old) were administered the anesthetic urethane.
- Brain damage was evaluated 1-4 days post-injection.
- Histological analysis focused on identifying lesions, particularly in the piriform cortex.
Main Results:
- Urethane administration resulted in significant lesions within subfields of the piriform cortex.
- The most severe damage was observed in rats treated at 2 weeks of age.
- These findings demonstrate urethane-induced developmental neurotoxicity in a specific brain region.
Conclusions:
- Urethane induces selective neuronal death in the developing piriform cortex.
- Developmental neurotoxicity is age-dependent, with young animals being most vulnerable.
- Further research is needed to evaluate the potential risks of other anesthetics in pregnant women and children.
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