Volume 10, Issue 1 (January & February 2019)                   BCN 2019, 10(1): 23-36 | Back to browse issues page


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Jahanmahin A, Abbasnejad Z, Haghparast A, Ahmadiani A, Ghasemi R. The Effect of Intrahippocampal Insulin Injection on Scopolamine-induced Spatial Memory Impairment and Extracellular Signal-regulated Kinases Alteration. BCN. 2019; 10 (1) :23-36
URL: http://bcn.iums.ac.ir/article-1-1096-en.html
1- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
2- Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Abstract:  
Introduction: It is well documented that insulin has neuroprotective and neuromodulator effects and can protect against different models of memory loss. Furthermore, cholinergic activity plays a significant role in memory, and scopolamine-induced memory loss is widely used as an experimental model of dementia. The current study aimed at investigating the possible effects of insulin against scopolamine-induced memory impairment in Wistar rat and its underlying molecular mechanisms.
Methods: Accordingly, animals were bilaterally cannulated in CA1, hippocampus. Intrahippocampal administration of insulin 6 MU and 12 MU in CA1 per day was performed during first 6 days after surgery. During next four days, the animal’s spatial learning and memory were assessed in Morris water maze test (three days of learning and one day of retention test). The animals received scopolamine (1 mg/kg) Intraperitoneally (IP) 30 minutes before the onset of behavioral tests in each day. In the last day, the hippocampi were dissected and the levels of MAPK (mitogen-activated protein kinases) and caspase-3 activation were analyzed by Western blot technique. 
Results: The behavioral results showed that scopolamine impaired spatial learning and memory without activating casapase-3, P38, and JNK, but chronic pretreatment by both doses of insulin was unable to restore this spatial memory impairment. In addition, scopolamine significantly reduced Extracellular signal-Regulated Kinases (ERKs) activity and insulin was unable to restore this reduction. Results revealed that scopolamine-mediated memory loss was not associated with hippocampal damage.
Conclusion: Insulin as a neuroprotective agent cannot restore memory when there is no hippocampal damage. In addition, the neuromodulator effect of insulin is not potent enough to overwhelm scopolamine-mediated disruptions of synaptic neurotransmission.
Type of Study: Original | Subject: Behavioral Neuroscience
Received: 2017/12/19 | Accepted: 2018/03/6 | Published: 2019/01/1

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