Chinese Medical Sciences Journal ›› 2018, Vol. 33 ›› Issue (1): 29-37.doi: 10.24920/11802

• Original Articles • Previous Articles     Next Articles

Astragaloside IV Protects Against Aβ1-42-induced Oxidative Stress, Neuroinflammation and Cognitive Impairment in Rats

Pan Yanfang1, Jia Xiaotao2, Song Erfei3, Peng Xiaozhong4, *()   

  1. 1Department of Pathology, Shaanxi University of Chinese Medicine, Xianyang, Shaanxi 712046, China
    2Department of Neurology, The Affiliated Xi'an Central Hospital of Xi'an Jiaotong University College of Medicine, Xi'an 710003, China;
    3 Department of Biology, York University, Toronto, ON M3J 1P3, Canada
    4State Key Laboratory of Medical Molecular Biology, Department of Molecular Biology and Biochemistry, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences & School of Basic Medicine Peking Union Medical College, Beijing 100005, China;
  • Received:2017-06-02 Online:2018-02-13 Published:2018-02-13
  • Contact: Peng Xiaozhong E-mail:pengxiaozhong@pumc.edu.cn
  • About author:This study investigated the neuroprotective action of astragaloside Ⅳon spatial learning and memory impairment induced by amyloid-beta 1-42 in rats and elucidated its underlying molecular mechanisms.
  • Supported by:
    Traditional Chinese Medicine Scientific Research Projects of Shaanxi Province of China(JCMS032)
This study investigated the neuroprotective action of astragaloside Ⅳon spatial learning and memory impairment induced by amyloid-beta 1-42 in rats and elucidated its underlying molecular mechanisms.

Abstract: Objective To investigate the neuroprotective action of astragaloside IV (AS-IV) on spatial learning and memory impairment induced by amyloid-beta 1-42 (Aβ1-42) in rats and elucidate its underlying molecular mechanisms. Methods Adult-male Sprague-Dawley rats (230-250 g) were divided into six groups randomly: control, Aβ1-42, AS-IV, Aβ1-42 plus 5 mg/kg·d AS-IV, Aβ1-42 plus 25 mg/kg·d AS-IV, and Aβ1-42 plus 50 mg/kg·d AS-IV groups. Aβ1-42 were delivered by intracerebroventricular injection under the guidance of a brain stereotaxic apparatus. The Morris water maze test (hidden platform test, probe trials, visible platform test) was performed one week after Aβ1-42 injection to obtain the ability of rat spatial learning and memory. AS-IV (5, 25 and 50 mg/kg·d) was administrated intraperitoneally once per day from the 8th day after Aβ1-42 injection for 5 consecutive days. Average escape latencies, distances for searching for the platform under water and the percentage of total time elapsed and distance swam in the right quadrant after removing platform were determined by behavior software system. The vision and swim speeds of rats were also determined to exclude the effect of these factors on the parameters of learning and memory. After behavioral tests, the rats were sacrificed immediately by decapitation. Hippocampus were collected. The enzyme activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-px) and catalase (CAT) in the hippocampus obtained from different-treated rat brain were measured by following the manufacturer’s instructions. The levels of interleukin-1 beta (IL-1β) and tumor necrosis factor-alpha (TNF-α) in tissue lysates were assayed with ELISA. Results The water maze test results indicated that chronic treatments with AS-IV effectively protected the rats from Aβ1-42-induced spatial learning and memory impairment. Furthermore, the activities of SOD, GSH-px and CAT decreased by Aβ1-42 were also restored by AS-IV treatment in the hippocampus of rats. In addition, AS-IV significantly decreased the levels of IL-1β and TNF-α in the hippocampus of Aβ1-42-induced amnesia’s rats.Conclusion Our findings suggest that AS-IV might be a useful chemical in improving the spatial memory and relieving the oxidative stress and neuroinflammation in Alzheimer patients.

Key words: amyloid-β protein, astragaloside IV, spatial learning and memory, oxidative stress, neuroinflammation

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