LRP1 and RAGE Expression in the Frontal Cortex in the Alzheimer's Disease Ischemia Model During 2 Years of Follow-Up.

Exploration of the gene-level changes that occur during post-ischemic neurodegeneration in the frontal cortex is crucial for understanding the development of dementia. An ischemic model of Alzheimer's disease was used to evaluate changes in the expression of the receptor for advanced glycation end products (RAGE) and low-density lipoprotein receptor-related protein 1 (LRP1), which are associated with amyloid and tau protein, in the frontal cortex after 10 min of cerebral ischemia, with survival at 2, 7, and 30 days and 0.5, 1, 1.5, and 2 years. LRP1 and RAGE expression was assessed by reverse transcription-quantitative polymerase chain reaction. After two days and 1.5 and 2 years post-ischemia, LRP1 expression was increased, after 7 days and 0.5 years it was decreased, and after 30 days and 1 year it oscillated around control values. The decrease in RAGE expression was statistically significant compared to the control group after 2 and 7 days and after 0.5 years, and after 30 days it oscillated around the control value, while after 1-2 years it increased significantly. RAGE and LRP1 expression showed the same pattern of changes from day 7 to year 2, peaking at 1 and 1.5 years, respectively. Another peak of RAGE overexpression was noted 2 years after ischemia. After 1, 1.5 and 2 years, overexpression of RAGE and LRP1 was observed after ischemia, with the dynamics of LRP1 changes being lower. Overall, the data showed a predominance of RAGE expression over LRP1 expression at 1-, 1.5-, and 2-years post-ischemia. The modification of LRP1 and RAGE after ischemia is useful in studying the molecular ischemic pathways involved in the development of Alzheimer's disease.