Involvement of Median Septum Region in Ghrelin Effects on Morphine-Induced Memory Impairment in Passive Avoidance Learning

Authors

  • Darbandi, Niloufar Assistant Professor, Department of Biology, Faculty of Science, Arak University, Arak, Iran
Abstract:

Background and purpose: Many studies have reported the effect of morphine on memory impairment. Evidence suggests that ghrelin enhances memory consolidation. The median septum also has a major role in memory and learning mechanisms. The present study aimed at investigating the role of median septum on the effects of ghrelin in morphine-induced amnesia. Materials and methods: In this experimental research, male Wistar rats were randomly divided into 12 groups: ghrelin groups (0, 0.3, 1.5, 3 nmol/µl) plus saline (1 ml/kg) or morphine (7.5 mg/kg) and groups treated with lidocaine (1 μl/rat) or saline (1 μl/rat) plus ghrelin (3 nmol/μl) or saline (1 μl/rat) plus morphine (7.5 mg/kg). Cannulation was done in the lateral ventricle and median septum. Ghrelin and lidocaine were injected into the lateral ventricle and septum, respectively and morphine was injected subcutaneously. Memory was assessed by avoidant learning. Results: Post-training intra-ventricle administration of ghrelin 5 min prior to morphine (7.5 mg/kg) prevented morphine amnesia (P= 0.000). Injection of lidocaine into the median septum 5 min before the injection of ghrelin prevented its effect on inhibition of morphine amnesia (P= 0.000). Conclusion: Injection of ghrelin into the lateral ventricle was found to be capable of preventing morphine-induced memory impairment. Inactivation of the median septum by injection of lidocaine reduced the effect of ghrelin on morphine-induced memory deficits. Therefore, the median septal region appears to mediate the effects of ghrelin on morphine-induced amnesia.  

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

The Role of Middle Septal Ghrelin Receptors in the Effects of Morphine on Memory Consolidation in Passive Avoidance Learning

Introduction: Evidence indicates that morphine impairs memory process. Ghrelin hormone has been linked to learning and memory processes and modulates reward properties of addictive drugs. In this study we examined the role of middle septal ghrelin receptors in the effects of morphine on memory consolidation in passive avoidance learning.   Materials & Methods: In this experimental study, 91 ma...

full text

Effect of Morphine on Passive Avoidance Memory in Cholestatic Rats

Background and purpose: Morphine as an opioid compound has different and sometimes conflicting effects on memory and learning process. Bile duct ligation causes cholestasis, which disrupts liver function. It is known that opioid systems are involved in cholestasis. The aim of this study was to investigate the possible effect of morphine on the memory of cholestatic rats. Materials and methods:...

full text

The Effect of Intra-Medial Septum Co-Injection of Ghrelin and Nicotine on Morphine Induced Memory Impairment

Evidence indicates that medial septum nicotinic receptors regulate cognitive process. Ghrelin is a gut hormone that regulates energy homeostasis. Ghrelin also is produced in brain and known to be involved in cognitive function. The purpose of the study was to evaluate the effects of medial septal injection of ghrelin on morphine-induced memory impairment in rats. Also, the possible relationship...

full text

The Effect of Ginkgo on Baclofen Induced Amnesia using Passive Avoidance Learning and Memory in Rats

Background & Objective: Ginkgo biloba is an herbal medicine that has a positive effect on improving memory. It prevents oxidative damage in mitochondria and cell death in a variety of Neuropathies. Besides, baclofen is prescribed for its analgesic and anti-inflammatory effects but has negative impact on memory. The objective of this study is to investigate the interaction of ginkgo with GABA b ...

full text

Low Frequency Stimulation Reverses the Kindling-Induced Impairment of Learning and Memory in the Rat Passive-avoidance Test

Introduction: The life quality of patients with epileptic seizures is highly affected by cognitive deficits. Low Frequency Stimulation (LFS) is a novel approach for the treatment of pharmacoresistant epilepsy. The main goal of this research is investigating the possible effect of LFS on seizure-induced cognitive dysfunction.  Methods: To this end, the kindled animal were prepared via CA1 ...

full text

Effects of different doses of zinc chloride on passive avoidance learning and memory in streptozotocin-induced diabetic adult male rats

Introduction: Zinc is an essential rare element that plays an important role in synaptic plasticity and modulation of the activity of central nervous system and is involved in learning and memory. Increasing zinc intake may protect against conditions associated with zinc deficiency, such as diabetes. Some studies have revealed that zinc deficiency in diabetic subjects is due to hogher excret...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 29  issue 179

pages  28- 39

publication date 2019-12

By following a journal you will be notified via email when a new issue of this journal is published.

Keywords

No Keywords

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023