Orexin Signaling Mediates the Antidepressant-Like Effect of Calorie Restriction

Journal of Neuroscience - Tập 28 Số 12 - Trang 3071-3075 - 2008
Michael Lutter1, Vaishnav Krishnan, Scott J. Russo, Saendy Jung, Colleen A. McClung, Eric J. Nestler
1Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-9070, USA. [email protected]

Tóm tắt

During periods of reduced food availability, animals must respond with behavioral adaptations that promote survival. Despite the fact that many psychiatric syndromes include disordered eating patterns as a component of the illness, little is known about the neurobiology underlying behavioral changes induced by short-term calorie restriction. Presently, we demonstrate that 10 d of calorie restriction, corresponding to a 20–25% weight loss, causes a marked antidepressant-like response in two rodent models of depression and that this response is dependent on the hypothalamic neuropeptide orexin (hypocretin). Wild-type mice, but not mice lacking orexin, show longer latency to immobility and less total immobility in the forced swim test after calorie restriction. In the social defeat model of chronic stress, calorie restriction reverses the behavioral deficits seen in wild-type mice but not in orexin knock-out mice. Additionally, chronic social defeat stress induces a prolonged reduction in the expression of prepro-orexin mRNA via epigenetic modification of the orexin gene promoter, whereas calorie restriction enhances the activation of orexin cells after social defeat. Together, these data indicate that orexin plays an essential role in mediating reduced depression-like symptoms induced by calorie restriction.

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Thông tin
Thông tin xuất bản

Journal of Neuroscience

Tập 28 Số 12

3071-3075

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