Objectives: Alzheimer’s disease (AD) is an irreversible, progressive neurodegenerative disorder. The proportion of elderly individuals at risk for AD and cardiovascular problems increases by raising life expectancy. The present study was designed to investigate the effect of the sacubitril/valsartan combination compared to that of valsartan alone in a rat model of AD. Methods: 72 male adult Wistar rats were divided into seven groups; control untreated rats received saline, control valsartan-treated rats received valsartan orally, control sacubitril/valsartan treated rats received sacubitril/valsartan orally, model rats received aluminum chloride i.p., model valsartan treated rats received aluminum chloride i.p. and valsartan orally and model sacubitril/valsartan treated rats received aluminum chloride i.p. and sacubitril/valsartan combination orally. All previous treatments continued on a daily basis for 6 weeks. At the second, fourth, and sixth weeks of the experiment, behavioral changes were evaluated using the Morris water maze and novel object recognition tests, and systolic blood pressure was measured. In the end, rat brain malondialdehyde and amyloid-beta 1-42 levels were measured, and the isolated hippocampus was evaluated histopathologically. Results: Valsartan improved AD symptoms in the aluminum-induced rat model, while the sacubitril/valsartan combination significantly worsened all tested parameters in both control and model rats compared with untreated and valsartan-treated animals. Conclusion: Based on the current study’s findings, valsartan did not increase the risk for AD development in control rats and improved AD symptoms in a rat model, while sacubitril/valsartan combination increased the risk of AD in control rats and worsened the condition in a rat model.
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