TRPC4 and Anxiety: Considering the evidence implicating amygdala involvement in PTSD symptoms (24), the location of both TRPC4 and TRPC5 in the amygdala (22, 59, 60) and their link with local neuroinflammation (66, 67), in addition to the reduced fear and anxiety demonstrated in knockout mice (TRPC4−/− rodents and TRPC5−/− rodents) (22, 59), it is reasonable to hypothesize that dampening amygdala activation of the fear response by blocking these ion channels may reduce PTSD symptom severity.