Chinese Journal of Clinical Anatomy ›› 2020, Vol. 38 ›› Issue (4): 438-443.doi: 10.13418/j.issn.1001-165x.2020.04.014

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The chronic stress induced expression of DPP-4 and its role in adipose inflammation and glucose metabolism

ABULAIKEMU·Mahemuti1, MAIMAITI·Yisireyili2,3, AIKEBAIER·Aili2,3, LI Yi-liang3, AZIGULI -Alimujiang2, YAN Jing3, KELIMU·Abudureyimu2,3   

  1. 1. Department of Emergency and Traumatic Surgery, 2. Research Institute of General and Minimally Invasive Surgery, 3. Department of Minimally Invasive Surgery, Hernia and Abdominal Wall Surgery, People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi 830001, China
  • Received:2019-05-15 Online:2020-07-25 Published:2020-07-29

Abstract: Objective To analyze chronic stress induced dipeptidyl peptidase-4 (DPP-4) expression and its role in adipose inflammation and glycometabolism. Methods 20 male SPF mice were randomly divided into two groups: a stress group and a control group. Mice in the stress group were restrained in our own restraint device for 2 hours per day and lasted for 14 days. The expression of macrophage surface marker (CD11b) in adipose tissue was detected by immunohistochemistry. The expression of DPP-4, adipocytokines (Adiponectin, MCP-1, IL-6, TNF-α) in adipose tissue and the expressions of glucose metabolism molecules (IRS-1, GLUT-4) were further detected by RT-PCR. The enzymatic activity of DPP-4 and the concentration of GLP-1 were detected by ELISA. Results The white adipose tissue (WAT) of the stress group mice significantly retracted and WAT weight significantly reduced (P<0.001). WAT in the stress group showed a large number of monocytes, neutrophils infiltration and inflammatory changes. Mice in the stress group significantly decreased the expression of Adiponectin and significantly increased the expression of MCP-1, IL-6 and TNF-α (P<0.001). DPP-4 expression in WAT tissues and its activity in blood increased significantly in the stress group, but the concentration of serum GLP-1 decreased significantly (P<0.001). The mRNA level of IRS-1 and mRNA level of GLUT-4 in WAT of the stress group were significantly lower than that of the control group (P<0.001). Conclusions Chronic stress induced abnormal expression of DPP-4 in adipose tissue, which can lead to adipose inflammation and abnormal glycometabolism.

Key words: Chronic stress,  Dipeptidyl peptidase-4,  Adipocytokine,  Inflammation, Glycometabolism

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