Importantly, the teasaponin treatment significantly increased the BDNF level in the hippocampus of the HF + TS group compared to the HF group (p = 0.011), but the BDNF level in the HF + TS group was still lower (p < 0.001) than the control group (Fig. 6C). The gene discussed is BDNF; the disease is hydrops fetalis.