Acta Anatomica Sinica ›› 2023, Vol. 54 ›› Issue (6): 676-681.doi: 10.16098/j.issn.0529-1356.2023.06.008

• Neurobiology • Previous Articles     Next Articles

Effects of liraglutide on inflammation and mitochondrial fusion/division in Parkinson’s disease model of mice induced by paraquat

 LIU  Zhe-chuan  LI  Kun  MA  Shuai-nan  MENG  Jia-qi  WANG  Yan-qin*   

  1. Department of Physiology, College of Life Sciences, Hebei Normal University, Shijiazhuang 050024, China
  • Received:2022-08-15 Revised:2022-10-31 Online:2023-12-06 Published:2023-12-06
  • Contact: Yan-Qin Wang E-mail:yqw1016@163.com

Abstract:

Objective  To investigate the protective effect and mechanism of liraglutide on the paraquat (PQ)-induced Parkinson’s disease (PD) mouse model.      Methods  Totally 24 Kunming mice were randomly divided into control group, PQ group and PQ +liraglutide group, 8 mice in each group. PD model was established by intraperitoneal injection of PQ (10 mg/kg) for 5 consecutive days, and liraglutide (50 nmol/kg) was injected intraperitoneally for 7 consecutive days. The free-standing and locomotor activity of mice were measured by behavioral method. Immunofluorescence was used to observe the number of tyrosine hydroxylase (TH) and ionized calcium binding adaptor molecule 1 (Iba1) immunoreactive cells. Western blotting was used to detect the expression of protein TH, glial fibrillary acidic protein (GFAP), mitofusin-2 (Mfn2) and dynamin-related protein 1 (Drp1).    Results  The numbers of free-standing and locomotor activity numbers decreased significantly (P<0.01, P<0.05) in PQ group compared with the control group, and the number of TH immunoreactive cells and TH protein expression in substantia nigra decreased significantly (P<0.01, P<0.01) compared with the control group, while the number of Iba1 immunoreactive cells and GFAP protein expression increased significantly (P<0.01, P<0.01) compared with the control group; the expression of Drp1 protein in PQ group was significantly higher than that in control group (P<0.05), while the Mfn2 protein expression decreased significantly (P<0.05) compared with the control group. After treatment with liraglutide, the number of TH positive cells in PQ + liraglutide group was significantly lower than that in control group (P<0.05); the numbers of free-standing and locomotor activity increased significantly (P<0.05, P<0.05) in PQ + liraglutide group compared with the PQ group, and the number of TH positive cells and expression of TH protein in PQ + liraglutide group were significantly higher than that in PQ group (P<0.01, P<0.01); while the number of Iba1 positive cells and GFAP protein expression decreased significantly (P<0.01, P<0.05) compared with the PQ group; the Drp1 protein expression decreased significantly (P<0.01) compared with the PQ group, while the expression of Mfn2 protein in PQ + liraglutide group was significantly higher than that in PQ group (P<0.01).   Conclusion  Liraglutide has neuroprotective effect by reducing neuroinflammation in substantia nigra, regulating mitochondrial fusion and fission.

Key words: Parkinson’s disease, Liraglutide, Paraquat, Inflammation, Mitochondrial fusion/division, Immunofluorescence, Western blotting, Mouse

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