title: Effects of chronic restraint stress on body weight, food intake, and hypothalamic gene expressions in mice.
abstract: BACKGROUND
  Stress affects body weight and food intake, but the underlying mechanisms are not well understood.
  
  
  METHODS
  We evaluated the changes in body weight and food intake of ICR male mice subjected to daily 2 hours restraint stress for 15 days. Hypothalamic gene expression profiling was analyzed by cDNA microarray.
  
  
  RESULTS
  Daily body weight and food intake measurements revealed that both parameters decreased rapidly after initiating daily restraint stress. Body weights of stressed mice then remained significantly lower than the control body weights, even though food intake slowly recovered to 90% of the control intake at the end of the experiment. cDNA microarray analysis revealed that chronic restraint stress affects the expression of hypothalamic genes possibly related to body weight control. Since decreases of daily food intake and body weight were remarkable in days 1 to 4 of restraint, we examined the expression of food intake-related genes in the hypothalamus. During these periods, the expressions of ghrelin and pro-opiomelanocortin mRNA were significantly changed in mice undergoing restraint stress. Moreover, daily serum corticosterone levels gradually increased, while leptin levels significantly decreased.
  
  
  CONCLUSIONS
  The present study demonstrates that restraint stress affects body weight and food intake by initially modifying canonical food intake-related genes and then later modifying other genes involved in energy metabolism. These genetic changes appear to be mediated, at least in part, by corticosterone.
authors.affiliation: Department of Anatomy and Neurobiology, Institute of Health Sciences, Medical Research Center for Neural Dysfunction, Gyeongsang National University School of Medicine, Jinju, Korea.
authors.forename: Joo Yeon
authors.initials: JY
authors.lastname: Jeong
authors.affiliation: Department of Anatomy and Neurobiology, Institute of Health Sciences, Medical Research Center for Neural Dysfunction, Gyeongsang National University School of Medicine, Jinju, Korea.
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Lee
authors.affiliation: Department of Anatomy and Neurobiology, Institute of Health Sciences, Medical Research Center for Neural Dysfunction, Gyeongsang National University School of Medicine, Jinju, Korea.
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Kang
keywords: Body weight; Eating; Hypothalamus; Microarray; Restraint stress