Rat hippocampal tissue expression levels of pAkt in the (A) sham, (B) model, (C) PROG and (D) Akt inhibitor groups, NF-κB in the (E) sham, (F) model, (G) PROG and (H) Akt inhibitor groups and Bcl-2 in the (I) sham, (J) model, (K) PROG and (L) Akt inhibitor groups. PROG, progesterone. Magnification, ×400; streptavidin-biotin complex (SABC) staining.