Immunohistochemical analysis of protein expression.

<p>NGF-positive and TrkA-positive cells were detected in the hippocampus and cortex, and these proteins were most highly abundant in the cytoplasm of hippocampal cells. SYN protein expression was stronger in the emitting layer of the hippocampus CA1 area than in the molecular layer, and the outline of the cone cells showed minimal SYN. The average grey values of NGF, TrkA, and SYN proteins in the VaD group were significantly lower than those in the control group. The average grey values of untransfected and NGF-TERT co-transfected BMSCs transplanted VaD groups were higher than those of the VaD group. Additionally, grey values of NGF-TERT co-transfected BMSCs transplanted VaD rats were significantly higher than those of the untransfected BMSCs transplanted VaD rats (*<i>P<</i>0.05, n = 12).