Depletion of cortical allopregnanolone potentiates stress-induced increase in cortical dopamine output.

In freely moving rats finasteride markedly reduced the cortical content of allopregnanolone. This treatment significantly prolonged the increase in the extracellular concentration of dopamine in the prefrontal cortex induced by foot shock. Moreover, finasteride enhanced both maximal increase of dopamine and its duration elicited by a single injection of the anxiogenic drug FG 7142. These results suggest that endogenous allopregnanolone may modulate the excitatory response of cortical dopaminergic neurons to stressful and anxiogenic stimuli.