Figure 4. Expressions of BDNF/TrKB/PI3K/ERK1/2 axis and apoptosis-related proteins, and apoptosis of hippocampal neurons in the three groups. (A) Representative protein bands of p-TrKB, p-PI3K, p-ERK1/2, Bcl-2, Bax, Caspase-9 and Caspase-3 in hippocampus of the three groups; (B) Relative protein expressions of p-TrKB, p-PI3K, p-ERK1/2, Bcl-2, Bax, Caspase-9, and Caspase-3 in hippocampus of the three groups; **P<0.01.