title: Effects of acute treadmill running at different intensities on activities of serotonin and corticotropin-releasing factor neurons, and anxiety- and depressive-like behaviors in rats.
abstract: Accumulating evidence suggests that physical exercise can reduce and prevent the incidence of stress-related psychiatric disorders, including depression and anxiety. Activation of serotonin (5-HT) neurons in the dorsal raphe nucleus (DRN) is implicated in antidepressant/anxiolytic properties. In addition, the incidence and symptoms of these disorders may involve dysregulation of the hypothalamic-pituitary-adrenal axis that is initiated by corticotropin-releasing factor (CRF) neurons in the hypothalamic paraventricular nucleus (PVN). Thus, it is possible that physical exercise produces its antidepressant/anxiolytic effects by affecting these neuronal activities. However, the effects of acute physical exercise at different intensities on these neuronal activation and behavioral changes are still unclear. Here, we examined the activities of 5-HT neurons in the DRN and CRF neurons in the PVN during 30 min of treadmill running at different speeds (high speed, 25 m/min; low speed, 15m/min; control, only sitting on the treadmill) in male Wistar rats, using c-Fos/5-HT or CRF immunohistochemistry. We also performed the elevated plus maze test and the forced swim test to assess anxiety- and depressive-like behaviors, respectively. Acute treadmill running at low speed, but not high speed, significantly increased c-Fos expression in 5-HT neurons in the DRN compared to the control, whereas high-speed running significantly enhanced c-Fos expression in CRF neurons in the PVN compared with the control and low-speed running. Furthermore, low-speed running resulted in decreased anxiety- and depressive-like behaviors compared with high-speed running. These results suggest that acute physical exercise with mild and low stress can efficiently induce optimal neuronal activation that is involved in the antidepressant/anxiolytic effects.
authors.affiliation: Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan.
authors.forename: Tomomi
authors.initials: T
authors.lastname: Otsuka
authors.affiliation: Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan.
authors.forename: Ayu
authors.initials: A
authors.lastname: Nishii
authors.affiliation: Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan.
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Amemiya
authors.affiliation: Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan.
authors.forename: Natsuko
authors.initials: N
authors.lastname: Kubota
authors.affiliation: Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nishijima
authors.affiliation: Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan. Electronic address: kita-ichiro@tmu.ac.jp.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kita
mesh_terms: D000208:Acute Disease; D000818:Animals; D001008:Anxiety Disorders / Q000473:pathology / Q000503:physiopathology* / Q000628:therapy; D003346:Corticotropin-Releasing Hormone / Q000378:metabolism; D003866:Depressive Disorder / Q000473:pathology / Q000503:physiopathology* / Q000628:therapy; D004195:Disease Models, Animal; D065847:Dorsal Raphe Nucleus / Q000378:metabolism / Q000473:pathology; D005081:Exercise Therapy; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D009474:Neurons / Q000473:pathology / Q000502:physiology*; D010286:Paraventricular Hypothalamic Nucleus / Q000473:pathology / Q000503:physiopathology; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D011897:Random Allocation; D017208:Rats, Wistar; D012420:Running / Q000502:physiology* / Q000523:psychology; D012701:Serotonin / Q000378:metabolism; D013315:Stress, Psychological / Q000473:pathology / Q000503:physiopathology / Q000628:therapy
chemical_list: D016760:Proto-Oncogene Proteins c-fos; D012701:Serotonin; D003346:Corticotropin-Releasing Hormone
keywords: 5-HT; Anxiety; CRF; Depression; Exercise; Immunohistochemistry