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Background The vascular changes due to cerebrovascular damage, especially on the capillaries, play a vital role in causing vascular dementia. Increasing oxidative stress can lead to tissue damage while reducing brain blood flow. The use of factors reducing the oxidative stress level can decrease the brain damages. Sulfur dioxide (SO2) is one of the most important air pollutants that lead to the development of severe brain damage in large quantities. However, studies have recently confirmed the protective effect of SO2 in cardiac ischemic injury, atherosclerosis and pulmonary infections. Methods The permanent bilateral common carotid artery occlusion (BCAO) method was used to induce chronic cerebral hypoperfusion (CCH). Two treatment groups of SO2 were studied. The animal cognitive performance was evaluated using the Morris water maze. Hippocampal tissue damage was examined after 2 months of BCAO. In the biochemical analysis, the activity of catalase and lipid peroxidation of the hippocampus was studied. Results Neuronal damage in hippocampus, as well as cognitive impairment in ischemia groups treated with SO2 showed a significant improvement. Catalase activity was also significantly increased in the hippocampus of treated groups. Conclusions According to the results, SO2 is likely to be effective in reducing the CCH-caused damages by increasing the antioxidant capacity of the hippocampus.

Effect of endogenous sulfur dioxide on spatial learning and memory and hippocampal damages in the experimental model of chronic cerebral hypoperfusion