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Jalilzad M, Jafari A, Babaei P. Neuregulin1β improves both spatial and associative learning and memory in Alzheimer model of rats possibly through signaling pathways other than Erk1/2. Neuropeptides 2019; 78:101963. [PMID: 31522857 DOI: 10.1016/j.npep.2019.101963] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 09/05/2019] [Accepted: 09/06/2019] [Indexed: 01/01/2023]
Abstract
BACKGROUND Neuregulin-1β (NRG1 β) is associated with various neurological disorders such as schizophrenia, depression and Parkinson's disease. However, its role in Alzheimer's (AD) has not been understood yet. Here, we have studied the effect of NRG1 β and extracellular-signal-regulated kinase (ERK) signaling on special and associative memories and emotional stress in AD model of rats. METHODS Fifty six male Wistar rats were divided into eight groups of: Saline + Saline, Aβ + Saline, Aβ + NRG1β (5 μg/5 ul), Aβ + PBS, Aβ + NRG1β + PD98059 (PD, 5 μg/2 μl), Aβ + NRG1β + Saline and Saline + PD. AD model was induced by intracerebroventricular (ICV) injection of beta-amyloid protein (Aβ1-42, 4 μg/2 μl). The cognitive performances of rats were evaluated using Morris Water Maze (MWM) and Step through passive avoidance. Also locomotors activity and emotionality of animals were considered in an Open field test. Data were analyzed by one way Anova one way, repeated measure and T-test. RESULTS Significant improvement was found in spatial learning and memory assessed by total time spent in target quadrant [F (4, 32) = 12.4, p = 0.001], escape latency [F (4, 32) = 15.767, p = 0.001] and distance moved [F (4, 32) = 5.55, p = 0.002], in Aβ + NRG1β compared with Aβ + Saline in MWM. Also Aβ + NRG1β showed long latencies to enter into the dark compartment [F (4, 32) = 6.43, p = 0.001], but short time spent [F (4, 32) =6.93, p = 0.001] compared with control. Administration of an ERK inhibitor (PD98059, 5 μg, 15 min before NRG1β) didn't completely block learning memory restored by NRG1β in AD model (p = 0.7). No significant between groups differences was found in emotional stress characteristics in open field, except the grooming numbers which were higher in Saline + PD compared with Saline + Saline (p = 0.02). CONCLUSION Our findings indicate that NRG1β restores cognitive dysfunctions induced by amyloid β through signaling pathways possibly other than Erk1/2, with no significant change in anxiety, locomotion and vegetative activities.
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Affiliation(s)
- Marzieh Jalilzad
- Cellular & Molecular Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran; Department of Physiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Adele Jafari
- Department of Physiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran; Neuroscience Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Parvin Babaei
- Cellular & Molecular Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran; Department of Physiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran; Neuroscience Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
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Zhang R, Liu C, Ji Y, Teng L, Guo Y. Neuregulin-1β Plays a Neuroprotective Role by Inhibiting the Cdk5 Signaling Pathway after Cerebral Ischemia-Reperfusion Injury in Rats. J Mol Neurosci 2018; 66:261-272. [PMID: 30206770 DOI: 10.1007/s12031-018-1166-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 08/28/2018] [Indexed: 01/24/2023]
Abstract
This study investigated the effects of neuregulin-1β (NRG1β) after middle cerebral artery occlusion/reperfusion (MCAO/R) in rats to evaluate whether they occur via the cyclin-dependent kinase (Cdk)5 signaling pathway. One hundred adult male Wistar rats were randomly divided into sham, MCAO/R, treatment (NRG1β), inhibitor (roscovitine; Ros), and inhibitor + treatment (Ros + NRG1β) groups. The MCAO/R model was established using the intraluminal thread method. The neurobehavioral function was evaluated by the modified neurological severity score (mNSS). The cerebral infarction volume (CIV) was measured by triphenyl tetrazolium chloride (TTC) staining. Morphological changes were observed by hematoxylin-eosin (HE) staining. The apoptotic cell index (ACI) was detected by the terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assay. Immunohistochemistry and Western blotting were performed to detect the expression of calpain 1, p35/p25 (regulatory binding partners of Cdk5), Cdk5, and p-Tau in neurons. The neuronal morphology in the MCAO/R, NRG1β, Ros + NRG1β, and Ros groups differed compared to the sham group; the mNSS, CIV, ACI, and the expression of calpain 1, p35/p25, Cdk5, and p-Tau were significantly increased in all four groups (P < 0.05). In the NRG1β, Ros and Ros + NRG1β groups, the neuronal morphology was significantly improved compared to the MCAO/R group, as were the mNSS, CIV, and ACI. The levels of calpain 1, p35/p25, and p-Tau were decreased compared with the MCAO/R group (P < 0.05), while the Cdk5 expression was not significantly different (P > 0.05). NRG1β may exert neuroprotective effects by inhibiting the expression of calpain 1, p35/p25, and p-Tau after cerebral ischemia-reperfusion injury.
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Affiliation(s)
- Rui Zhang
- Department of ICU, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Cui Liu
- Department Traumic Surgery, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Yaqing Ji
- Institute of Integrative Medicine, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Lei Teng
- Department of Biology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Yunliang Guo
- Institute of Cerebrovascular Diseases, Affiliated Hospital of Qingdao University, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders, Qingdao, 266003, China.
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Gu N, Ge K, Hao C, Ji Y, Li H, Guo Y. Neuregulin1β Effects on Brain Tissue via ERK5-Dependent MAPK Pathway in a Rat Model of Cerebral Ischemia-Reperfusion Injury. J Mol Neurosci 2017; 61:607-616. [PMID: 28265860 DOI: 10.1007/s12031-017-0902-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 02/16/2017] [Indexed: 11/29/2022]
Abstract
Neuregulin1β (NRG1β), a member of the excitomotor of tyrosine kinase receptor (erbB) family, was recently shown to play a neuroprotective role in cerebral ischemia-reperfusion injury. The present study analyzed the effects and its possible signaling pathway of NRG1β on brain tissues after cerebral ischemia-reperfusion injury. A focal cerebral ischemic model was established by inserting a monofilament thread to achieve middle cerebral artery occlusion, followed by an NRG1β injection via the internal carotid artery. NRG1β injection resulted in significantly improved neurobehavioral activity according to the modified neurological severity score test. Tetrazolium chloridestaining revealed a smaller cerebral infarction volume; hematoxylin-eosin staining and transmission electron microscopy showed significantly alleviated neurodegeneration in the middle cerebral artery occlusion rats. Moreover, expression of phosphorylated MEK5, phosphorylated ERK5, and phosphorylated MEK2C increased after NRG1β treatment, and the neuroprotective effect of NRG1β was attenuated by an injection of the MEK5 inhibitor, BIX02189. Results from the present study demonstrate that NRG1β provides neuroprotection following cerebral ischemia-reperfusion injury via the ERK5-dependent MAPK pathway.
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Affiliation(s)
- Ning Gu
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.,Institute of Integrated Medicine, Qingdao University Medical College, Qingdao, Shandong, China
| | - Keli Ge
- Institute of Integrated Medicine, Qingdao University Medical College, Qingdao, Shandong, China
| | - Cui Hao
- Institute of Cerebrovascular Diseases, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
| | - Yaqing Ji
- Institute of Integrated Medicine, Qingdao University Medical College, Qingdao, Shandong, China
| | - Hongyun Li
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
| | - Yunliang Guo
- Institute of Cerebrovascular Diseases, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
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Zhou MM, Xue Y, Sun SH, Wen M, Li ZJ, Xu J, Wang JF, Yanagita T, Wang YM, Xue CH. Effects of different fatty acids composition of phosphatidylcholine on brain function of dementia mice induced by scopolamine. Lipids Health Dis 2016; 15:135. [PMID: 27558491 PMCID: PMC4997672 DOI: 10.1186/s12944-016-0305-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 08/10/2016] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Phosphatidylcholine (PC), the major source of dietary choline, has been demonstrated to improve the capability of learning and memory in rodent and the amelioration of long-chain n-3 polyunsaturated fatty acids (PUFA) on anti-aging and anti-oxidation is widely known as well. In this study, three kinds of PC were chose to demonstrate the role of different fatty acids composition on glycerol backbone in improving the brain function of mice induced by scopolamine which was used to impair cholinergic system and cause oxidative stress. METHODS Male BALB/c mice were randomly divided into 5 groups: model (M) group, control (Con) group, egg yolk lecithin (EL) group, squid PC (SQ-PC) group and sea cucumber PC (SC-PC) group. The intraperitoneal injection of scopolamine hydrobromide (5 mg/kg) was carried out on the 8(th) of group feeding and sustained daily until the end of test. Morris water maze test was used to evaluate the improvement of cognitive decline and the activity of acetylcholinesterase (AchE), superoxide dismutase (SOD) and monoamine oxidase (MAO) and malondialdehyde (MDA) content in brain were measured to assess the physiological changes. RESULTS In behavior test, the latency of PC groups was significantly reduced, while number of crossing the platform and time in target quadrant were increased in comparison with M group and the improvements of SQ-PC and SC-PC were better than that of EL (P < 0.05). Similar trend was observed in physiological changes. The AchE activity was effectively decreased and the SOD activity increased in hippocampus, cortex and white matter when comparing PC groups with M group. SQ-PC, SC-PC and EL respectively showed 22.82, 28.80 and 11.81 % decrease in MDA level in brain compared with M group. The MAO activity in white matter of SQ-PC, SC-PC and EL group separately depressed 33.05, 33.64 and 19.73 % in comparison with M group. No significance between SQ-PC and SC-PC was found in these indicators except the SOD activity in hippocampus and white matter. SQ-PC group had a higher SOD activity in hippocampus (103.68U/mg · prot.) and lower in white matter (120.57 U/mg · prot.) than SC-PC group (95.53 U/mg · prot. in hippocampus, 134.49 U/mg · prot. in white matter). PC rich in n-3 PUFA acted more ameliorative effects than that barely contained on the indicators above. CONCLUSIONS Different fatty acids composition of PC all could diminish the cognitive decline and biological damage and protect the brain. EPA and DHA partly enhaced to the advantageous effects.
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Affiliation(s)
- Miao-Miao Zhou
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China
| | - Yong Xue
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China
| | - Shu-Hong Sun
- Clinical Laboratory, Qingdao Municipal Hospital (Group), NO. 1 Jiaozhou Road, Qingdao, Shangdong Province, 266011, People's Republic of China
| | - Min Wen
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China
| | - Zhao-Jie Li
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China
| | - Jie Xu
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China
| | - Jing-Feng Wang
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China
| | - Teruyoshi Yanagita
- Department of Health and Nutrition Sciences, Faculty of Health and Social Welfare Sciences, Nishikyushu University, 4490-9 Ozaki, Kanzaki, Saga, 842-8585, Japan
| | - Yu-Ming Wang
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China.
| | - Chang-Hu Xue
- College of Food Science and Engineering, Ocean University of China, NO. 5 Yushan Road, Qingdao, Shangdong Province, 266003, People's Republic of China.
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Rong L, Ding K, Zhang M, Guo Y. Neuregulin1β improves cognitive dysfunction and up-regulates expression of p-ERK1/2 in rats with chronic omethoate poisoning. Behav Brain Funct 2015; 11:5. [PMID: 25886297 PMCID: PMC4339006 DOI: 10.1186/s12993-014-0050-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2014] [Accepted: 12/29/2014] [Indexed: 01/18/2023] Open
Abstract
Objective To observe the effects of neuregulin1β (NRG1β) on the level of phosphorylated ERK1/2 (p-ERK1/2), and explore the therapeutic mechanism of NRG1β on the cognitive dysfunction in rats with chronic omethoate poisoning. Methods Rats with strong learning and memory ability, 50 in total, were selected by Y-electric maze test. Among which, 15 rats were randomly selected into control group, and the rest 35 rats were used to establish experimental cognitive impairment models by being injected with omethoate subcutaneously. The 30 cases of successful cognitive impairment models were randomly divided into model group and treated group consisting of 15 rats, respectively. Then rats in treated group were injected with NRG1β into their lateral ventricles, while rats in control and model groups were given equal volume of PBS simultaneously. The cognitive capacity of rats was evaluated with Y-electric maze. The morphology and ultrastructure of hippocampus were observed by hematoxylin eosin (HE) staining and transmission electron microscopy (TEM) respectively. The expression of p-ERK1/2 was determined by immunohistochemical (IHC) staining and Western blotting. Results Compared with rats in model group, the cognitive ability of rats with omethoate exposed (model and treated groups) reduced significantly, along with the obvious damage of hippocampal neurons and the expression of p-ERK1/2 decreased significantly (P < 0.05). And after treatment with NRG1β, the cognitive activity of treated rats was improved obviously, and the injury of hippocampal neurons was milder and the expression of p-ERK1/2 increased significantly more than those in model rats (P < 0.05). Conclusion In chronic omethoate poisoning rats, NRG1β can promote the phosphorylation level of ERK1/2 in hippocampal neurons, and play an important role in the improvement of cognitive function.
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Affiliation(s)
- Lixia Rong
- Institute of Cerebrovascular Diseases, Affiliated Hospital of Qingdao University, Qingdao, 266003, China.
| | - Kun Ding
- Department of Neurology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China.
| | - Meizeng Zhang
- Department of Neurology, Affiliated Hospital of Qingdao University, Qingdao, 266003, China.
| | - Yunliang Guo
- Institute of Cerebrovascular Diseases, Affiliated Hospital of Qingdao University, Qingdao, 266003, China.
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Spencer JR, Darbyshire KME, Boucher AA, Kashem MA, Long LE, McGregor IS, Karl T, Arnold JC. Novel molecular changes induced by Nrg1 hypomorphism and Nrg1-cannabinoid interaction in adolescence: a hippocampal proteomic study in mice. Front Cell Neurosci 2013; 7:15. [PMID: 23447498 PMCID: PMC3581856 DOI: 10.3389/fncel.2013.00015] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 02/06/2013] [Indexed: 02/01/2023] Open
Abstract
Neuregulin 1 (NRG1) is linked to an increased risk of developing schizophrenia and cannabis dependence. Mice that are hypomorphic for Nrg1 (Nrg1 HET mice) display schizophrenia-relevant behavioral phenotypes and aberrant expression of serotonin and glutamate receptors. Nrg1 HET mice also display idiosyncratic responses to the main psychoactive constituent of cannabis, Δ9-tetrahydrocannabinol (THC). To gain traction on the molecular pathways disrupted by Nrg1 hypomorphism and Nrg1-cannabinoid interactions we conducted a proteomic study. Adolescent wildtype (WT) and Nrg1 HET mice were exposed to repeated injections of vehicle or THC and their hippocampi were submitted to 2D gel proteomics. Comparison of WT and Nrg1 HET mice identified proteins linked to molecular changes in schizophrenia that have not been previously associated with Nrg1. These proteins are involved in vesicular release of neurotransmitters such as SNARE proteins; enzymes impacting serotonergic neurotransmission, and proteins affecting growth factor expression. Nrg1 HET mice treated with THC expressed a distinct protein expression signature compared to WT mice. Replicating prior findings, THC caused proteomic changes in WT mice suggestive of greater oxidative stress and neurodegeneration. We have previously observed that THC selectively increased hippocampal NMDA receptor binding of adolescent Nrg1 HET mice. Here we observed outcomes consistent with heightened NMDA-mediated glutamatergic neurotransmission. This included differential expression of proteins involved in NMDA receptor trafficking to the synaptic membrane; lipid raft stabilization of synaptic NMDA receptors; and homeostatic responses to dampen excitotoxicity. These findings uncover novel proteins altered in response to Nrg1 hypomorphism and Nrg1-cannabinoid interactions that improves our molecular understanding of Nrg1 signaling and Nrg1-mediated genetic vulnerability to the neurobehavioral effects of cannabinoids.
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Affiliation(s)
- Jarrah R Spencer
- Discipline of Pharmacology, University of Sydney Sydney, NSW, Australia ; Brain and Mind Research Institute, University of Sydney Sydney, NSW, Australia
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The effects of neuregulin-1β on neuronal phenotypes of primary cultured dorsal root ganglion neurons by activation of PI3K/Akt. Neurosci Lett 2012; 511:52-7. [DOI: 10.1016/j.neulet.2012.01.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 01/16/2012] [Accepted: 01/18/2012] [Indexed: 11/19/2022]
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