Mild hyperbaric oxygen inhibits the decrease of dopaminergic neurons in the substantia nigra of mice with MPTP-induced Parkinson’s disease

We examined whether exposure to mild hyperbaric oxygen inhibits the decrease of dopaminergic neu rons in the substantia nigra of a neurotoxic animal model with Parkinson’s disease. Mice injected with1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine hydrochloride and probenecid twice a week were divided into two groups: mice with mild hyperbaric oxygen and those without. The mice with mild hyperbaric oxygen were exposed to 1317 hPa with 45% oxygen for 3 h, three times a week. The decrease in dopamin ergic neurons of mice with Parkinson’s disease was inhibited by 11 weeks of exposure to mild hyperbaric oxygen. We conclude that exposure to mild hyperbaric oxygen is effective in preventing the progressionof Parkinson’s disease.