CRF–CRF1system activation mediates withdrawal-induced increases in nicotine self-administration in nicotine-dependent rats

Abstract
Nicotine, the main psychoactive ingredient of tobacco, induces negative emotional symptoms during abstinence that contribute to a profound craving for nicotine. However, the neurobiological mechanisms underlying how nicotine produces dependence remains poorly understood. We demonstrate one mechanism for both the anxiety-like symptoms of withdrawal and excessive nicotine intake observed after abstinence, through recruitment of the extrahypothalamic stress peptide corticotropin-releasing factor (CRF) system and activation of CRF1receptors. Overactivation of the CRF–CRF1system may contribute to nicotine dependence and may represent a prominent target for investigating the vulnerability to tobacco addiction.