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Effects of the hydro-alcoholic extract of Nigella sativa on scopolamine-induced spatial memory impairment in rats and its possible mechanism

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Abstract

Objective

To evaluate the effect of Nigella sativa (NS) extract on memory performance and its possible mechanisms in scopolamine (Sco)-induced spatial memory impairment model using Morris water maze test.

Methods

Thirty-two male Wistar rats were randomly divided into four groups. The control group received saline instead of both NS extract and Sco. The Sco group was treated by saline for two weeks, and was injected by Sco (2 mg/kg, intraperitoneally) 30 min before each trail in Morris water maze test. Sco+NS 200 and Sco+NS 400 groups were daily treated by 200 or 400 mg/kg of NS (intraperitoneally) for two weeks, respectively, and were finally injected by Sco 30 min before Morris water maze test. The brains of animals were removed to determine the acetylcholinesterase (AChE) activity and oxidative stress criteria in cortical tissues.

Results

Time latency and path length in the Sco group were significantly higher than in the control group (P<0.01), while the Sco+NS 400 group showed a significantly shorter traveled path length and time latency compared with the Sco group (P<0.01). AChE activity in the cortical tissues of the Sco group was significantly higher than the control group (P<0.01), while AChE activity in the Sco+NS 200 and Sco+NS 400 groups was lower than the Sco group (P<0.01). Following Sco administration, malondialdehyde (MDA) concentrations were increased (P<0.01) in comparison with the control group, while cortical total thiol content decreased (P<0.01). Pretreatment with extracts caused a significant elevation in cortical total thiol content (P<0.01) and reduction in cortical MDA concentration (P<0.01) compared with the Sco group.

Conclusions

Hydro-alcoholic extract of NS prevents Sco-induced spatial memory deficits and decreases the AChE activity as well as oxidative stress of brain tissues in rats. Our results support the traditional belief about the beneficial effects of NS in nervous system. Moreover, further investigations are needed for better understanding of this protective effect.

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Authors and Affiliations

  1. Neurogenic Inflammation Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran

    Mahmoud Hosseini & Ziba Rajaei

  2. Pharmacological Research Center of Medicinal Plants, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran

    Toktam Mohammadpour

  3. Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran

    Reza Karami

  4. Neurocognitive Research Center and Department of Pharmacology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran

    Hamid Reza Sadeghnia

  5. Department of Biochemistry, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran

    Mohammad Soukhtanloo

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  1. Mahmoud Hosseini
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Correspondence to Mahmoud Hosseini.

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Hosseini, M., Mohammadpour, T., Karami, R. et al. Effects of the hydro-alcoholic extract of Nigella sativa on scopolamine-induced spatial memory impairment in rats and its possible mechanism. Chin. J. Integr. Med. 21, 438–444 (2015). https://doi.org/10.1007/s11655-014-1742-5

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