Effects of chronic social defeat stress on peripheral leptin and its hypothalamic actions

BMC Neuroscience

Atsushi Toyoda²  Shigeru Chohnan¹  Takamitsu Tsukahara³  Yasuki Ogawa²  Haruyoshi Takagi²  Wataru Iio² 

[1] Department of Bioresorce Science, College of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan;Department of Biological Production Science, College of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan;Kyoto Institute of Nutrition and Pathology Inc., Ujitawara, Kyoto 610-0231, Japan

关键词: Malonyl-CoA;    Leptin;    Hypothalamus;    Depression;    Chronic social defeat stress;    Anorexia;   

Others  :  799243
DOI  :  10.1186/1471-2202-15-72

 received in 2014-01-28, accepted in 2014-05-28,  发布年份 2014

【 摘 要 】

Background

Suppression of body weight and symptom of anorexia are major symptoms of depression. Recently, we reported that chronic social defeat stress (CSDS) induced suppression of body weight gain and anorexic feeding behavior in rats. These abnormalities were the result of disrupted malonyl-coenzyme A (CoA) signaling pathway in the hypothalamus. However, the condition of peripheral leptin and its hypothalamic downstream signal molecules which regulate hypothalamic malonyl-CoA level in the CSDS-exposed rats (CSDS rats) is still unknown.

Results

CSDS rats showed suppressed body weight gain and food intake. The weight of the CSDS rats’ epididymal white adipose tissues was decreased when compared to the control rats. The plasma cholesterol concentration was decreased significantly in the CSDS rats compared to the control rats (P < 0.05). The plasma glucose concentration was slightly decreased in the CSDS rats compared to the control rats (P < 0.1). The expression of leptin mRNA in epididymal white adipose tissues and the plasma leptin concentration were decreased in CSDS rats. Furthermore, the phosphorylation of the hypothalamic downstream signals of leptin, including extracellular signal-regulated kinase 1/2 (ERK1/2) and signal transducer and activator of transcription 3 (STAT3), was decreased in CSDS rats.

Conclusions

Our results indicated that decreased peripheral leptin expression in CSDS rats could down-regulate the hypothalamic downstream signaling pathways of leptin while suppressed food intake. These data indicate that CSDS induces the down-regulation of hypothalamic AMPK following the elevation of hypothalamic malonyl-CoA levels and is independent of peripheral leptin and glucose.

【 授权许可】

   
2014 Iio et al.; licensee BioMed Central Ltd.

【 图 表 】

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