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Published on: May 12, 2018
Melatonin reduces the severity of anesthesia-induced apoptotic neurodegeneration in the developing rat brain
Jun-Heum Yon1, Lisa B Carter, Russel J Reiter
1Department of Anesthesiology, University of Virginia Health System, PO Box 800710, Charlottesville, VA 22908, USA.
Abstract:
General anesthetics cause widespread apoptotic neurodegeneration in many regions of the developing rat brain. The activation of mitochondria-dependent apoptotic pathway is important in the early stages of anesthesia-induced developmental neuroapoptosis. To investigate potential means of protecting against this type of damage, we studied melatonin, a sleep-promoting agent and antioxidant known to inhibit apoptotic-type neuronal damage by improving mitochondrial homeostasis and stabilizing the inner mitochondrial membrane. When 7-day-old rats (the peak of synaptogenesis) were exposed to a commonly used and highly pro-apoptotic anesthesia cocktail (midazolam, isoflurane, nitrous oxide) in combination with the escalating doses of melatonin (from 1 to 20 mg/kg, s.c.), the severity of anesthesia-induced damage was reduced in a dose-dependent manner in two most vulnerable brain regions--the cerebral cortex and anterior thalamus. Melatonin-induced neuroprotection was mediated, at least in part, via the inhibition of mitochondria-dependent apoptotic pathway since melatonin caused an up-regulation of the anti-apoptotic protein, bcl-X(L), reduction in anesthesia-induced cytochrome c release into the cytoplasm and a decrease in anesthesia-induced activation of caspase-3, an important step in the activation of DNAses and the formation of the apoptotic bodies.
Insights
Melatonin protects developing rat brains from anesthesia-induced neurodegeneration. This antioxidant reduces apoptotic damage in vulnerable brain regions by inhibiting the mitochondria-dependent apoptotic pathway.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Toxicology
Background:
- General anesthetics induce apoptotic neurodegeneration in developing brains.
- Mitochondria-dependent apoptotic pathways are critical in anesthesia-induced neurotoxicity.
Purpose of the Study:
- Investigate melatonin's neuroprotective potential against anesthesia-induced developmental neurotoxicity.
- Determine if melatonin can mitigate anesthesia-induced apoptotic damage in the developing rat brain.
Main Methods:
- Administered escalating doses of melatonin (1-20 mg/kg) to 7-day-old rats exposed to an anesthesia cocktail (midazolam, isoflurane, nitrous oxide).
- Assessed neurodegeneration in the cerebral cortex and anterior thalamus.
- Evaluated melatonin's effect on mitochondria-dependent apoptotic markers, including bcl-X(L) protein levels, cytochrome c release, and caspase-3 activation.
Main Results:
- Melatonin administration reduced anesthesia-induced neurodegeneration in a dose-dependent manner.
- Neuroprotection was observed in the cerebral cortex and anterior thalamus, key vulnerable regions.
- Melatonin up-regulated anti-apoptotic bcl-X(L), decreased cytochrome c release, and inhibited caspase-3 activation, indicating pathway inhibition.
Conclusions:
- Melatonin confers significant neuroprotection against anesthesia-induced developmental neurotoxicity in rats.
- Melatonin's protective effects are mediated, in part, by inhibiting the mitochondria-dependent apoptotic pathway.
- Melatonin shows promise as a therapeutic agent to prevent anesthetic-related brain damage in vulnerable populations.
