BDNF and major depressive disorder: revealed that the ethanol H. citrina extractions (HCE) could enhance monoamines and brain‐derived neurotrophic factor (BDNF) levels in corticosterone (CORT)‐induced and acute stress‐induced depression‐like models of rodents, thereby exhibiting anti‐depressant‐like effects (Gu et al., 2012; Yi et al., 2012).