Intranasal Administration of Insulin Reduces Chronic Behavioral Abnormality and Neuronal Apoptosis Induced by General...

Area of Science:

• Neuroscience
• Developmental Biology
• Pharmacology

Background:

• Repeated exposure to general anesthetics, like sevoflurane, poses a neurotoxic risk to the developing brain.
• Anesthesia during critical developmental periods may lead to long-term learning disabilities and behavioral deficits.
• Currently, no established treatments exist to prevent anesthesia-induced neurotoxicity in children.

Purpose of the Study:

• To investigate the long-term behavioral and neurobiological consequences of sevoflurane anesthesia in neonatal mice.
• To evaluate the potential of intranasal insulin administration as a protective intervention against anesthesia-induced neurotoxicity.

Main Methods:

• Neonatal mice (postnatal day 7) were exposed to sevoflurane anesthesia for 3 hours daily over three consecutive days.
• Behavioral assessments included novel object recognition, Morris water maze, and fear conditioning tests.
• Biochemical and immunohistochemical analyses measured postsynaptic density 95 (PSD95) levels and neuronal apoptosis.

Main Results:

• Sevoflurane anesthesia induced mild, long-term behavioral abnormalities in neonatal mice.
• Anesthesia exposure led to decreased brain PSD95 levels and increased neuronal apoptosis.
• Intranasal insulin administration prior to anesthesia prevented behavioral deficits, PSD95 reduction, and apoptosis.

Conclusions:

• Sevoflurane anesthesia causes lasting neurodevelopmental and behavioral impairments in neonatal mice.
• Intranasal insulin shows promise as a neuroprotective agent against anesthesia-induced brain damage.
• This study highlights a potential therapeutic strategy to mitigate anesthesia risks in the developing brain.