Estrogen inhibition on the expression of amyloid precursor protein C-terminal in ovariectomized female rat hippocampus and cortex / 中国药理学通报

ABSTRACT

AIM To study the effect of estrogen on the expression of amyloid precursor protein (APP) carboxyl terminal fragment in ovariectomized female rat hippocampus and cortex regions. METHODS Ovariectomized female rats were fed with Premarin or Progynova for 3 cycles before sacrificed. S P immunohistochemistry was performed to detect the APP C terminal fragment distribution, and semi quantitative H score was used to compare the expression. RESULTS APP C terminal fragment expression in both female rat hippocampus and cortex increased significantly after ovariectomy. Compared with ovariectomized control, C terminal fragment expression in the above regions decreased. It was even lower in progynova group than in premarin group. CONCLUSION Both premarin and progynova down regulate the APP C terminal expression in ovariectomized female rat hippocampus and cortex. The modulation of progynova is more effective.