Overexpression of ICAM5 in the Hippocampus of Mice: Construct an adeno-associated virus (AAV) for overexpression of ICAM5. Using stereotactic injection techniques, inject AAV-mCherry or AAV-ICAM5 into the bilateral hippocampal regions of mice, with each mouse receiving 0.8 μL. Three weeks later, randomly select three mice and use immunofluorescence techniques to observe the expression of ICAM5 in the hippocampus and its colocalization with NeuN, MAP2, GFAP, and Iba1.