Volume 13, Issue 5 (September & October 2022)
BCN 2022, 13(5): 661-674 |
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Zamani N, Moazedi A A, Afarinesh Khaki M R, Pourmehdi Boroujeni M. Effects of Memantine on the Spontaneous Firing Frequency of Hippocampal CA1 Pyramidal Neurons in Intact and Alzheimer Rat Model: An Electrophysiological Study. BCN 2022; 13 (5) :661-674
URL: http://bcn.iums.ac.ir/article-1-1574-en.html
URL: http://bcn.iums.ac.ir/article-1-1574-en.html
Nastaran Zamani * 
1, Ahmad Ali Moazedi2 , Mohamad Reza Afarinesh Khaki3 , Mehdi Pourmehdi Boroujeni4
1, Ahmad Ali Moazedi2 , Mohamad Reza Afarinesh Khaki3 , Mehdi Pourmehdi Boroujeni4
1- Department of Biology, School of Science, Payame Noor University, Tehran, Iran.
2- Department of Biology, School of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
3- Kerman Cognitive Research Center, Kerman Neuroscience Research Center, Institute of Neuropharmachology, Kerman University of Medical Sciences, Kerman, Iran.
4- Department of Food Hygiene, School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2- Department of Biology, School of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
3- Kerman Cognitive Research Center, Kerman Neuroscience Research Center, Institute of Neuropharmachology, Kerman University of Medical Sciences, Kerman, Iran.
4- Department of Food Hygiene, School of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Abstract:
Introduction: Memantine (MEM) is a noncompetitive N-methyl-D-aspartate receptor (NMDAR) antagonist clinically used for the treatment of Alzheimer disease (AD) in mild to severe conditions. The present study was conducted to investigate the effects of memantine on the spontaneous firing frequency of CA1 pyramidal neurons in rats caused by an electrical lesion of Nucleus Basalis Magnocellularis (NBM). Then, this model of AD rats was compared with the intact adult male rats.
Methods: In this study, adult male rats were divided into two groups. Group I (lesion of NBM, n=53) includes the following subgroups: lesion+saline, sham+saline, lesion+MEM 5 mg/kg, lesion+MEM 10 mg/kg, and lesion+MEM 20mg/kg. Group II (intact, n=48) includes the following subgroups: intact+saline, intact+MEM 3mg/kg, intact+MEM 5mg/kg, and intact+MEM 10mg/kg. Extracellular single-unit recording (15 min baseline+105 min after MEM or saline) was performed under urethane-anesthetized rats.
Results: The results showed that the mean frequency of CA1 pyramidal neurons after saline in the lesion+saline (P<0.001) group significantly decreases compared with the intact+saline and sham+saline groups. In addition, after saline and memantine, the mean frequency of CA1 pyramidal neurons in the lesion+MEM 10 mg/kg (P<0.01) and lesion+MEM 20 mg/kg (P<0.001) groups significantly increased compared with the lesion+saline group. Also, the mean frequencies of CA1 pyramidal neurons in the intact+MEM 10 mg/kg (P<0.001) group significantly decreased compared with the intact+saline group.
Conclusion: Results showed that memantine increases the electrical activity of CA1 pyramidal neurons in a rat model of AD. Furthermore, in the intact adult male rats, the low-dose memantine, contrary to high dose, does not decrease the electrical activity of CA1 pyramidal neurons.
Methods: In this study, adult male rats were divided into two groups. Group I (lesion of NBM, n=53) includes the following subgroups: lesion+saline, sham+saline, lesion+MEM 5 mg/kg, lesion+MEM 10 mg/kg, and lesion+MEM 20mg/kg. Group II (intact, n=48) includes the following subgroups: intact+saline, intact+MEM 3mg/kg, intact+MEM 5mg/kg, and intact+MEM 10mg/kg. Extracellular single-unit recording (15 min baseline+105 min after MEM or saline) was performed under urethane-anesthetized rats.
Results: The results showed that the mean frequency of CA1 pyramidal neurons after saline in the lesion+saline (P<0.001) group significantly decreases compared with the intact+saline and sham+saline groups. In addition, after saline and memantine, the mean frequency of CA1 pyramidal neurons in the lesion+MEM 10 mg/kg (P<0.01) and lesion+MEM 20 mg/kg (P<0.001) groups significantly increased compared with the lesion+saline group. Also, the mean frequencies of CA1 pyramidal neurons in the intact+MEM 10 mg/kg (P<0.001) group significantly decreased compared with the intact+saline group.
Conclusion: Results showed that memantine increases the electrical activity of CA1 pyramidal neurons in a rat model of AD. Furthermore, in the intact adult male rats, the low-dose memantine, contrary to high dose, does not decrease the electrical activity of CA1 pyramidal neurons.
Type of Study: Original |
Subject:
Cognitive Neuroscience
Received: 2019/08/5 | Accepted: 2020/04/19 | Published: 2022/09/1
Received: 2019/08/5 | Accepted: 2020/04/19 | Published: 2022/09/1
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