BDNF and brain disorder: BDNF‐related molecular pathways are also potential targets for treating brain diseases (Choi et al, 2018; Nagahara et al, 2009) as impairments of BDNF‐mediated cellular function are linked to several neurological and psychiatric disorders (Björkholm & Monteggia, 2016; Lima Giacobbo et al, 2019).