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Behl T, Madaan P, Sehgal A, Singh S, Makeen HA, Albratty M, Alhazmi HA, Meraya AM, Bungau S. Demystifying the Neuroprotective Role of Neuropeptides in Parkinson's Disease: A Newfangled and Eloquent Therapeutic Perspective. Int J Mol Sci 2022; 23:ijms23094565. [PMID: 35562956 PMCID: PMC9099669 DOI: 10.3390/ijms23094565] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/17/2022] [Accepted: 04/18/2022] [Indexed: 02/07/2023] Open
Abstract
Parkinson's disease (PD) refers to one of the eminently grievous, preponderant, tortuous nerve-cell-devastating ailments that markedly impacts the dopaminergic (DArgic) nerve cells of the midbrain region, namely the substantia nigra pars compacta (SN-PC). Even though the exact etiopathology of the ailment is yet indefinite, the existing corroborations have suggested that aging, genetic predisposition, and environmental toxins tremendously influence the PD advancement. Additionally, pathophysiological mechanisms entailed in PD advancement encompass the clumping of α-synuclein inside the lewy bodies (LBs) and lewy neurites, oxidative stress, apoptosis, neuronal-inflammation, and abnormalities in the operation of mitochondria, autophagy lysosomal pathway (ALP), and ubiquitin-proteasome system (UPS). The ongoing therapeutic approaches can merely mitigate the PD-associated manifestations, but until now, no therapeutic candidate has been depicted to fully arrest the disease advancement. Neuropeptides (NPs) are little, protein-comprehending additional messenger substances that are typically produced and liberated by nerve cells within the entire nervous system. Numerous NPs, for instance, substance P (SP), ghrelin, neuropeptide Y (NPY), neurotensin, pituitary adenylate cyclase-activating polypeptide (PACAP), nesfatin-1, and somatostatin, have been displayed to exhibit consequential neuroprotection in both in vivo and in vitro PD models via suppressing apoptosis, cytotoxicity, oxidative stress, inflammation, autophagy, neuronal toxicity, microglia stimulation, attenuating disease-associated manifestations, and stimulating chondriosomal bioenergetics. The current scrutiny is an effort to illuminate the neuroprotective action of NPs in various PD-experiencing models. The authors carried out a methodical inspection of the published work procured through reputable online portals like PubMed, MEDLINE, EMBASE, and Frontier, by employing specific keywords in the subject of our article. Additionally, the manuscript concentrates on representing the pathways concerned in bringing neuroprotective action of NPs in PD. In sum, NPs exert substantial neuroprotection through regulating paramount pathways indulged in PD advancement, and consequently, might be a newfangled and eloquent perspective in PD therapy.
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Affiliation(s)
- Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, India; (P.M.); (A.S.); (S.S.)
- Correspondence: (T.B.); (S.B.)
| | - Piyush Madaan
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, India; (P.M.); (A.S.); (S.S.)
| | - Aayush Sehgal
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, India; (P.M.); (A.S.); (S.S.)
| | - Sukhbir Singh
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, India; (P.M.); (A.S.); (S.S.)
| | - Hafiz A. Makeen
- Pharmacy Practice Research Unit, Department of Clinical Pharmacy, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia; (H.A.M.); (A.M.M.)
| | - Mohammed Albratty
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia; (M.A.); (H.A.A.)
| | - Hassan A. Alhazmi
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia; (M.A.); (H.A.A.)
- Substance Abuse and Toxicology Research Center, Jazan University, Jazan 45142, Saudi Arabia
| | - Abdulkarim M. Meraya
- Pharmacy Practice Research Unit, Department of Clinical Pharmacy, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia; (H.A.M.); (A.M.M.)
| | - Simona Bungau
- Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, 410028 Oradea, Romania
- Doctoral School of Biomedical Sciences, University of Oradea, 410028 Oradea, Romania
- Correspondence: (T.B.); (S.B.)
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Bademci R, Erdoğan MA, Eroğlu E, Meral A, Erdoğan A, Atasoy Ö, Erbaş O. Demonstration of the protective effect of ghrelin in the livers of rats with cisplatin toxicity. Hum Exp Toxicol 2021; 40:2178-2187. [PMID: 34151639 DOI: 10.1177/09603271211026722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Despite the various and newly developed chemotherapeutic agents in recent years, cisplatin is still used very frequently as a chemotherapeutic agent, even though cisplatin has toxic effects on many organs. The aim of our study is to show whether ghrelin reduces the liver toxicity of cisplatin in the rat model. Twenty-eight male Sprague Dawley albino mature rats were chosen to be utilized in the study. Group 1 rats (n = 7) were taken as the control group, and no medication was given to them. Group 2 rats (n = 7) received 5 mg/kg/day cisplatin and 1 ml/kg/day of 0.9% NaCl, Group 3 rats (n = 7) received 5 mg/kg/day cisplatin and 10 ng/kg/day ghrelin, Group 4 rats (n = 7) received 5 mg/kg/day cisplatin and 20 ng/kg/day ghrelin for 3 days. Glutathione, malondialdehyde (MDA), superoxide dismutase (SOD), plasma alanine aminotransferase (ALT) levels, and liver biopsy results were measured in rats. It was determined that, especially in the high-dose group, the MDA, plasma ALT, and SOD levels increased less in the ghrelin group as compared to the cisplatin group, and the glutathione level decreased slightly with a low dose of ghrelin, while it increased with a higher dose. In histopathological examination, it was determined that the toxic effect of cisplatin on the liver was reduced with a low dose of ghrelin, and its histopathological appearance was similar to normal liver tissue when given a high dose of ghrelin. These findings show that ghrelin, especially in high doses, can be used to reduce the toxic effect of cisplatin.
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Affiliation(s)
- R Bademci
- Department of General Surgery, 218502Istanbul Medipol University, Istanbul, Turkey
| | - M A Erdoğan
- Faculty of Medicine, Department of Physiology, 485550Izmir Katip Çelebi University, Izmir, Turkey
| | - E Eroğlu
- Department of General Surgery, 64117Memorial Hospital, Istanbul, Turkey
| | - A Meral
- Medical Faculty, Department of Biochemistry, 64162Yuzuncü Yıl University, Van, Turkey
| | - A Erdoğan
- Department of Emergency Medicine, Izmir Cigli Regional Training Hospital, Izmir, Turkey
| | - Ö Atasoy
- Department of Radiation Oncology, Kartal Dr. Lütfi Kırdar Training and Research Hospital, Istanbul, Turkey
| | - O Erbaş
- Department of Physiology, Istanbul Bilim University, Istanbul, Turkey
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Liu M, Jiao Q, Du X, Bi M, Chen X, Jiang H. Potential Crosstalk Between Parkinson's Disease and Energy Metabolism. Aging Dis 2021; 12:2003-2015. [PMID: 34881082 PMCID: PMC8612621 DOI: 10.14336/ad.2021.0422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 04/22/2021] [Indexed: 01/22/2023] Open
Abstract
Parkinson's disease (PD) is characterized by the accumulation of alpha-synuclein (α-Syn) in the substantia nigra (SN) and the degeneration of nigrostriatal dopaminergic (DAergic) neurons. Some studies have reported that the pathology of PD originates from the gastrointestinal (GI) tract, which also serves as an energy portal, and develops upward along the neural pathway to the central nervous system (CNS), including the dorsal motor nucleus of vagus (DMV), SN, and hypothalamus, which are also involved in energy metabolism control. Therefore, we discuss the alterations of nuclei that regulate energy metabolism in the development of PD. In addition, due to their anti-inflammatory, antiapoptotic and antioxidative roles, metabolism-related peptides are involved in the progression of PD. Furthermore, abnormal glucose and lipid metabolism are common in PD patients and exacerbate the pathological changes in PD. Therefore, in this review, we attempt to explain the correlation between PD and energy metabolism, which may provide possible strategies for PD treatment.
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Affiliation(s)
- Meiqiu Liu
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, School of Basic Medicine, Medical College, Qingdao University, Qingdao, China
| | - Qian Jiao
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, School of Basic Medicine, Medical College, Qingdao University, Qingdao, China
| | - Xixun Du
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, School of Basic Medicine, Medical College, Qingdao University, Qingdao, China
| | - Mingxia Bi
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, School of Basic Medicine, Medical College, Qingdao University, Qingdao, China
| | - Xi Chen
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, School of Basic Medicine, Medical College, Qingdao University, Qingdao, China
| | - Hong Jiang
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, School of Basic Medicine, Medical College, Qingdao University, Qingdao, China
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Zheng Y, Zhang L, Xie J, Shi L. The Emerging Role of Neuropeptides in Parkinson's Disease. Front Aging Neurosci 2021; 13:646726. [PMID: 33762925 PMCID: PMC7982480 DOI: 10.3389/fnagi.2021.646726] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 02/10/2021] [Indexed: 12/11/2022] Open
Abstract
Parkinson’s disease (PD), the second most common age-related neurodegenerative disease, results from the loss of dopamine neurons in the substantia nigra. This disease is characterized by cardinal non-motor and motor symptoms. Several studies have demonstrated that neuropeptides, such as ghrelin, neuropeptide Y, pituitary adenylate cyclase-activating polypeptide, substance P, and neurotensin, are related to the onset of PD. This review mainly describes the changes in these neuropeptides and their receptors in the substantia nigra-striatum system as well as the other PD-related brain regions. Based on several in vitro and in vivo studies, most neuropeptides play a significant neuroprotective role in PD by preventing caspase-3 activation, decreasing mitochondrial-related oxidative stress, increasing mitochondrial biogenesis, inhibiting microglial activation, and anti-autophagic activity. Thus, neuropeptides may provide a new strategy for PD therapy.
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Affiliation(s)
- Yanan Zheng
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Linlin Zhang
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Junxia Xie
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Qingdao University, Qingdao, China.,Institute of Brain Science and Disease, Qingdao University, Qingdao, China
| | - Limin Shi
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Qingdao University, Qingdao, China.,Institute of Brain Science and Disease, Qingdao University, Qingdao, China
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He X, Yuan W, Liu F, Feng J, Guo Y. Acylated Ghrelin is Protective Against 6-OHDA-induced Neurotoxicity by Regulating Autophagic Flux. Front Pharmacol 2021; 11:586302. [PMID: 33584263 PMCID: PMC7872958 DOI: 10.3389/fphar.2020.586302] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 12/21/2020] [Indexed: 11/13/2022] Open
Abstract
Parkinson’s disease (PD) is one of the most common neurodegenerative disorders, and our previous study revealed that autophagic flux dysfunction contributes to the neuron death in 6-OHDA-induced PD models. Acylated ghrelin is a neuropeptide that has a variety of actions in the central nervous system. In the current study, we aimed to investigate whether ghrelin is neuroprotective in 6-OHDA-induced rat model and SH-SY5Y cell model and whether it is related to autophagic flux regulation. We observed that ghrelin could effectively reduce apomorphine-induced contralateral rotation in 6-OHDA-induced PD rats, preserve the expression of tyrosine hydroxylase (TH) and increase the cell viability. It could upregulate the expression of autophagy related proteins like Atg7 and LC3-II and downregulate p62, and downregulate apoptosis related proteins like bax and cleaved caspase 3. SH-SY5Y cells transfected with adenovirus Ad-mCherry-GFP-LC3B further revealed that ghrelin could relieve the autophagic flux dysfunction induced by 6-OHDA. Lysotracker staining showed that ghrelin could reverse the decrease in lysosomes induced by 6-OHDA and immunofluorescence staining revealed a reverse of TFEB level in SH-SY5Y cells. Blocking autophagy activation with 3-methyladenine (3-MA) in rats treated with ghrelin and 6-OHDA showed no notable change in apoptosis-related markers, while blocking autophagosome fusion with lysosomes with chloroquine could notably reverse the downregulation of bax/bcl-2 ratio and cleaved caspase three expression by ghrelin. Additionally, knockdown ATG7, the upstream regulator of autophagy, with siRNA could further decrease the number of apoptotic cells in SH-SY5Y cells exposed to 6-OHDA and treated with ghrelin, while knockdown TFEB, a key transcription factor for lysosome biosynthesis and function, with siRNA could completely abolish the anti-apoptosis effect of ghrelin. These data suggest that ghrelin is neuroprotective in 6-OHDA-induced PD models via improving autophagic flux dysfunction and restoration of TFEB level.
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Affiliation(s)
- Xin He
- Department of Neurology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Wei Yuan
- Department of Orthopedics, The First Hospital of China Medical University, Shenyang, China
| | - Fei Liu
- Department of Neurology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Juan Feng
- Department of Neurology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yanxia Guo
- Department of Neurology, Shengjing Hospital of China Medical University, Shenyang, China
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Reich N, Hölscher C. Acylated Ghrelin as a Multi-Targeted Therapy for Alzheimer's and Parkinson's Disease. Front Neurosci 2020; 14:614828. [PMID: 33381011 PMCID: PMC7767977 DOI: 10.3389/fnins.2020.614828] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 11/27/2020] [Indexed: 12/13/2022] Open
Abstract
Much thought has been given to the impact of Amyloid Beta, Tau and Alpha-Synuclein in the development of Alzheimer's disease (AD) and Parkinson's disease (PD), yet the clinical failures of the recent decades indicate that there are further pathological mechanisms at work. Indeed, besides amyloids, AD and PD are characterized by the culminative interplay of oxidative stress, mitochondrial dysfunction and hyperfission, defective autophagy and mitophagy, systemic inflammation, BBB and vascular damage, demyelination, cerebral insulin resistance, the loss of dopamine production in PD, impaired neurogenesis and, of course, widespread axonal, synaptic and neuronal degeneration that leads to cognitive and motor impediments. Interestingly, the acylated form of the hormone ghrelin has shown the potential to ameliorate the latter pathologic changes, although some studies indicate a few complications that need to be considered in the long-term administration of the hormone. As such, this review will illustrate the wide-ranging neuroprotective properties of acylated ghrelin and critically evaluate the hormone's therapeutic benefits for the treatment of AD and PD.
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Affiliation(s)
- Niklas Reich
- Biomedical & Life Sciences Division, Lancaster University, Lancaster, United Kingdom
| | - Christian Hölscher
- Neurology Department, A Second Hospital, Shanxi Medical University, Taiyuan, China.,Research and Experimental Center, Henan University of Chinese Medicine, Zhengzhou, China
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Chen P, Wang Y, Chen L, Song N, Xie J. Apelin-13 Protects Dopaminergic Neurons against Rotenone-Induced Neurotoxicity through the AMPK/mTOR/ULK-1 Mediated Autophagy Activation. Int J Mol Sci 2020; 21:ijms21218376. [PMID: 33171641 PMCID: PMC7664695 DOI: 10.3390/ijms21218376] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 10/29/2020] [Accepted: 11/02/2020] [Indexed: 02/07/2023] Open
Abstract
Parkinson’s disease (PD) is characterized by the progressive loss of dopaminergic neurons in the substantia nigra pars compacta. Several brain–gut peptides are able to exert neuroprotective effects on the nigrostriatal dopaminergic system. Apelin-13 is a neuropeptide, conveying potential neuroprotective activities. However, whether, and how, apelin-13 could antagonize rotenone-induced neurotoxicity has not yet been elucidated. In the present study, rotenone-treated SH-SY5Y cells and rats were used to clarify whether apelin-13 has protective effects on dopaminergic neurons, both in vivo and in vitro. The results showed that apelin-13 could protect SH-SY5Y cells from rotenone-induced injury and apoptosis. Apelin-13 was able to activate autophagy, and restore rotenone induced autophagy impairment in SH-SY5Y cells, which could be blocked by the autophagy inhibitor 3-Methyladenine. Apelin-13 activated AMPK/mTOR/ULK-1 signaling, AMPKα inhibitor compound C, as well as apelin receptor blockage via siRNA, which could block apelin-13-induced signaling activation, autophagy activation, and protective effects, in rotenone-treated SH-SY5Y cells. These results indicated that apelin-13 exerted neuroprotective properties against rotenone by stimulating AMPK/mTOR/ULK-1 signaling-mediated autophagy via the apelin receptor. We also observed that intracerebroventricular injection of apelin-13 could alleviate nigrostriatal dopaminergic neuron degeneration in rotenone-treated rats. Our findings provide new insights into the mechanism by which apelin-13 might attenuate neurotoxicity in PD.
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Affiliation(s)
- Peng Chen
- Institute of Brain Science and Disease, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders, Qingdao University, Qingdao 266071, China; (P.C.); (Y.W.); (L.C.)
- Department of Physiology, College of Basic Medicine, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250000, China
| | - Youcui Wang
- Institute of Brain Science and Disease, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders, Qingdao University, Qingdao 266071, China; (P.C.); (Y.W.); (L.C.)
| | - Leilei Chen
- Institute of Brain Science and Disease, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders, Qingdao University, Qingdao 266071, China; (P.C.); (Y.W.); (L.C.)
| | - Ning Song
- Institute of Brain Science and Disease, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders, Qingdao University, Qingdao 266071, China; (P.C.); (Y.W.); (L.C.)
- Correspondence: (N.S.); or (J.X.)
| | - Junxia Xie
- Institute of Brain Science and Disease, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders, Qingdao University, Qingdao 266071, China; (P.C.); (Y.W.); (L.C.)
- Correspondence: (N.S.); or (J.X.)
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Chang X, Ma Z, Shi L, Xie J. Effects of ghrelin on the electrical activities of substantia nigra dopaminergic neurons treated with MPP .. Neurochem Int 2020; 138:104780. [PMID: 32569790 DOI: 10.1016/j.neuint.2020.104780] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 05/19/2020] [Accepted: 05/30/2020] [Indexed: 12/17/2022]
Abstract
Ghrelin, a 28 amino acid brain-gut peptide, has attracted increasing attention for its neuroprotective effect in Parkinson's disease (PD). In view of the pivotal role of excitability of dopaminergic neurons in substantia nigra pars compacta (SNc) in the function of nigrostriatal system, it is of great significance to elucidate the regulation of electrical activity of dopaminergic neurons by ghrelin, especially in PD pathogenesis. In this study, we tackled this issue by probing the effects of ghrelin on the electrophysiological properties of dopaminergic neurons in acute application of Methyl-4-phenylpyridinium (MPP+), a potent parkinsonizing agent in primates and rodents, with whole cell patch clamp technique. We first observed that MPP+ (10, 20 and 50 μM) inhibited the spontaneous firing activity of dopaminergic neurons with dose-dependent and time-dependent properties. MPP+ also hyperpolarized the membrane potential, inhibited the evoked firing activity and reduced the amplitude of the inward rectification characteristic (Sag) in dopaminergic neurons. Importantly, ghrelin (100 nM) could improve the above effects of MPP+ on the electrical activities of dopaminergic neurons. The potential mechanism of this phenomenon may be that ghrelin upregulated hyperpolarization-activated cyclic nucleotide-gated channel current (Ih) to antagonize the inhibition of MPP+ on Ih, thereby improving the electrical activities of dopaminergic neurons.
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Affiliation(s)
- Xiaoli Chang
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Medical College of Qingdao University, Qingdao, 266071, China; Institute of Brain Science and Disease, Qingdao University, Qingdao, 266071, China; Institute of Acupuncture, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Zegang Ma
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Medical College of Qingdao University, Qingdao, 266071, China; Institute of Brain Science and Disease, Qingdao University, Qingdao, 266071, China
| | - Limin Shi
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Medical College of Qingdao University, Qingdao, 266071, China; Institute of Brain Science and Disease, Qingdao University, Qingdao, 266071, China.
| | - Junxia Xie
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, School of Basic Medicine, Medical College of Qingdao University, Qingdao, 266071, China; Institute of Brain Science and Disease, Qingdao University, Qingdao, 266071, China.
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Dong D, Xie J, Wang J. Neuroprotective Effects of Brain-Gut Peptides: A Potential Therapy for Parkinson's Disease. Neurosci Bull 2019; 35:1085-1096. [PMID: 31286411 DOI: 10.1007/s12264-019-00407-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 04/29/2019] [Indexed: 12/16/2022] Open
Abstract
Parkinson's disease (PD) is the second most common neurodegenerative disease and is typically associated with progressive motor and non-motor dysfunctions. Currently, dopamine replacement therapy is mainly used to relieve the motor symptoms, while its long-term application can lead to various complications and does not cure the disease. Numerous studies have demonstrated that many brain-gut peptides have neuroprotective effects in vivo and in vitro, and may be a promising treatment for PD. In recent years, some progress has been made in studies on the neuroprotective effects of some newly-discovered brain-gut peptides, such as glucagon-like peptide 1, pituitary adenylate cyclase activating polypeptide, nesfatin-1, and ghrelin. However, there is still no systematic review on the neuroprotective effects common to these peptides. Thus, here we review the neuroprotective effects and the associated mechanisms of these four peptides, as well as other brain-gut peptides related to PD, in the hope of providing new ideas for the treatment of PD and related clinical research.
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Affiliation(s)
- Dong Dong
- Department of Physiology and Pathophysiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, 266071, China
| | - Junxia Xie
- Department of Physiology and Pathophysiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, 266071, China.
| | - Jun Wang
- Department of Physiology and Pathophysiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders, Shandong Provincial Collaborative Innovation Center for Neurodegenerative Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, 266071, China.
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10
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Elabi OF, Duskova K, Davies JS, Lane EL. The Impact of Ghrelin on the Survival and Efficacy of Dopaminergic Fetal Grafts in the 6-OHDA-Lesioned Rat. Neuroscience 2018; 395:13-21. [PMID: 30414880 DOI: 10.1016/j.neuroscience.2018.10.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 10/31/2018] [Accepted: 10/31/2018] [Indexed: 12/21/2022]
Abstract
Ghrelin is a peptide produced in the gut with a wide range of physiological functions. Recent studies have suggested it may have potential as a neuroprotective agent in models of Parkinson's disease, reducing the impact of toxic challenges on the survival of nigral dopaminergic neurons. The presence of the ghrelin receptor (GHSR1a) on the dopaminergic neurons of the substantia nigra raises the possibility that a potential application for this property of ghrelin may be as an adjunctive neuroprotective agent to enhance and support the survival and integration of dopaminergic cells transplanted into the striatum. Thus far, inconsistent outcomes in clinical trials for fetal cell transplantation have been linked to low rates of cell survival which we hypothesize could be ameliorated by the presence of ghrelin. To explore this, we confirmed the expression of the GHSR1a and related enzymes on e14 ventral mesencephalon. To determine a functional effect, five groups of female Sprague-Dawley rats received a unilateral 6-OHDA lesion to the medial forebrain bundle and four received an intrastriatal graft of e14 ventral mesencephalic cells. Grafted rats received saline; acyl-ghrelin (10 µg/kg); acyl-ghrelin (50 µg/kg) or the ghrelin agonist JMV-2894 (160 µg/kg) i.p. for 8 weeks. An effect of ghrelin at low dose on hippocampal neurogenesis indicated blood-brain barrier penetrance and attainment of biologically relevant levels but neither acyl-ghrelin nor JMV-2894 improved graft survival or efficacy.
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Affiliation(s)
- O F Elabi
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, CF10 3NB, UK.
| | - K Duskova
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, CF10 3NB, UK
| | - J S Davies
- Insitute of Life Sciences, School of Medicine, Swansea University, SA2 8PP, UK
| | - E L Lane
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, CF10 3NB, UK.
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Kim C, Park S. IGF-1 protects SH-SY5Y cells against MPP +-induced apoptosis via PI3K/PDK-1/Akt pathway. Endocr Connect 2018; 7:443-455. [PMID: 29459421 PMCID: PMC5843822 DOI: 10.1530/ec-17-0350] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 02/19/2018] [Indexed: 01/13/2023]
Abstract
Insulin-like growth factor (IGF)-1 is a well-known anti-apoptotic pro-survival factor and phosphatidylinositol-3-kinase (PI3K)/Akt pathway is linked to cell survival induced by IGF-1. It is also reported that Akt signaling is modulated by 3-phosphoinositide-dependent kinase-1 (PDK1). In the current study, we investigated whether the anti-apoptotic effect of IGF-1 in SH-SY5Y cells exposed to 1-methyl-4-phenylpyridinium (MPP+) is associated with the activity of PI3K/PDK1/Akt pathway. Treatment of cells with IGF-1 inhibited MPP+-induced apoptotic cell death. IGF-1-induced activation of Akt and the protective effect of IGF-1 on MPP+-induced apoptosis were abolished by chemical inhibition of PDK1 (GSK2334470) or PI3K (LY294002). The phosphorylated levels of Akt and PDK1 were significantly suppressed after MPP+ exposure, while IGF-1 treatment completely restored MPP+-induced reductions in phosphorylation. IGF-1 protected cells from MPP+ insult by suppressing intracellular reactive oxygen species (ROS) production and malondialdehyde levels and increasing superoxide dismutase activity. Mitochondrial ROS levels were also increased during MPP+ exposure, which were attenuated by IGF-1 treatment. In addition, IGF-1-treated cells showed increased activities of succinate dehydrogenase and citrate synthase, stabilization of mitochondrial transmembrane potential, increased ratio of Bcl-2 to Bax, prevention of cytochrome c release and inhibition of caspase-3 activation with PARP cleavage. Furthermore, the protective effects of IGF-1 on oxidative stress and mitochondrial dysfunction were attenuated when cells were preincubated with GSK2334470 or LY294002. Our data suggest that IGF-1 protects SH-SY5Y cells against MPP+-associated oxidative stress by preserving mitochondrial integrity and inhibiting mitochondrial apoptotic cascades via the activation of PI3K/PDK1/Akt pathway.
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Affiliation(s)
- Chanyang Kim
- Department of Biomedical ScienceGraduate School, Kyung Hee University, Seoul, Korea
| | - Seungjoon Park
- Department of Pharmacology and Medical Research Center for Bioreaction to ROS and Biomedical Science InstituteSchool of Medicine, Kyung Hee University, Seoul, Korea
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12
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Acylated and unacylated ghrelin confer neuroprotection to mesencephalic neurons. Neuroscience 2017; 365:137-145. [DOI: 10.1016/j.neuroscience.2017.09.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/24/2017] [Accepted: 09/25/2017] [Indexed: 11/18/2022]
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13
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Song N, Wang W, Jia F, Du X, Xie A, He Q, Shen X, Zhang J, Rogers JT, Xie J, Jiang H. Assessments of plasma ghrelin levels in the early stages of parkinson's disease. Mov Disord 2017; 32:1487-1491. [PMID: 28681931 DOI: 10.1002/mds.27095] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 06/05/2017] [Accepted: 06/07/2017] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Gastrointestinal symptoms are early events in Parkinson's disease (PD). The gastrointestinal hormone ghrelin was neuroprotective in the nigrostriatal dopamine system. The objective of this study was to assess ghrelin levels in the early stages of PD. METHODS Plasma was collected in the fasting state in 291 PD patients in stages 1-3 and 303 age- and sex-matched healthy controls. Additional samples were taken in the glucose response test to assess nutrition-related ghrelin levels in 20 PD patients and 20 healthy controls. The enzyme-linked immunosorbent assay was used to measure total and active plasma ghrelin levels. RESULTS We reported that total and active plasma ghrelin levels were decreased in PD, although there was no difference across progressive PD stages. Postprandial ghrelin suppression and preprandial peak responses were both attenuated in PD. CONCLUSIONS Plasma ghrelin levels were decreased in PD; however, this event might be irrelevant to PD progression. Ghrelin responses to meals were also impaired in PD. © 2017 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Ning Song
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Weiwei Wang
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Fengjv Jia
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Xixun Du
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Anmu Xie
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China.,Department of Neurology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Qing He
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Xiaoli Shen
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Jing Zhang
- Department of Pathology, University of Washington School of Medicine, Seattle, Washington, USA
| | - Jack T Rogers
- Neurochemistry Laboratory, Department of Psychiatry-Neuroscience, Massachusetts General Hospital (East), Harvard Medical School, Charlestown, Masssachusetts, USA
| | - Junxia Xie
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
| | - Hong Jiang
- Department of Physiology, Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological Disorders and State Key Disciplines: Physiology, Medical College of Qingdao University, Qingdao, China
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14
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Yoshii Y, Inoue T, Uemura Y, Iwasaki Y, Yada T, Nakabeppu Y, Noda M. Complexity of Stomach-Brain Interaction Induced by Molecular Hydrogen in Parkinson's Disease Model Mice. Neurochem Res 2017; 42:2658-2665. [PMID: 28462451 DOI: 10.1007/s11064-017-2281-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/11/2017] [Accepted: 04/22/2017] [Indexed: 11/28/2022]
Abstract
Molecular hydrogen (H2), as a new medical gas, has protective effects in neurological disorders including Parkinson's disease (PD). In our previous report, the neuroprotective effect of drinking water with saturated H2 (H2 water) in PD mice might be due to stomach-brain interaction via release of gastric hormone, ghrelin. In the present study, we assessed the effect of H2-induced ghrelin more precisely. To confirm the contribution of ghrelin in H2 water-drinking PD model mice, ghrelin-knock out (KO) mice were used. Despite the speculation, the effect of H2 water was still observed in ghrelin-KO PD model mice. To further check the involvement of ghrelin, possible contribution of ghrelin-induced vagal afferent effect was tested by performing subdiaphragmatic vagotomy before treating with H2 water and administration of MPTP (1-methyl- 4-phenyl-1,2,3,6-tetrahydropyridine). The protective effect of H2 water was still observed in the vagotomized mice in substantia nigra, suggesting that stimulation of vagal afferent nerves is not involved in H2-induced neuroprotection. Other neuroprotective substitutes in ghrelin-KO mice were speculated because H2-induced neuroprotection was not cancelled by ghrelin receptor antagonist, D-Lys3 GHRP-6, in ghrelin-KO PD model mice, unlike in wild-type PD model mice. Our results indicate that ghrelin may not be the only factor for H2-induced neuroprotection and other factors can substitute the role of ghrelin when ghrelin is absent, raising intriguing options of research for H2-responsive factors.
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Affiliation(s)
- Yusuke Yoshii
- Laboratory of Pathophysiology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Taikai Inoue
- Laboratory of Pathophysiology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Yuya Uemura
- Laboratory of Pathophysiology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Yusaku Iwasaki
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
| | - Toshihiko Yada
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
| | - Yusaku Nakabeppu
- Division of Neurofunctional Genomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, 812-8582, Japan
| | - Mami Noda
- Laboratory of Pathophysiology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan.
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Yuge K, Hara M, Okabe R, Nakamura Y, Okamura H, Nagamitsu S, Yamashita Y, Orimoto K, Kojima M, Matsuishi T. Ghrelin improves dystonia and tremor in patients with Rett syndrome: A pilot study. J Neurol Sci 2017; 377:219-223. [PMID: 28477699 DOI: 10.1016/j.jns.2017.04.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 04/07/2017] [Accepted: 04/10/2017] [Indexed: 02/04/2023]
Abstract
BACKGROUND Dystonia occurs in approximately 60% of patients with Rett syndrome (RTT) and severely impairs their quality of life. However, an effective standard therapy has not been established. In a previous study, ghrelin levels were significantly decreased in patients with RTT, in particular, among patients over 10years old. This prompted speculation that ghrelin may play an important role in RTT. OBJECTIVES Four patients, including two adults, with severe dystonia and tremor, were recruited. METHODS Ghrelin was intravenously administered at a dose of 3μg/kg, once-daily for 3days, followed by once every 3weeks. Objective evaluation was performed, including scoring for different clinical features (SDCF), the Burke-Fahn-Marsden Dystonia Rating Scale (BFMDRS) and the Visual Analog Scale (VAS). RESULTS The SDCF, BFMDRS, autonomic dysfunction and VAS scores were markedly improved in two patients with severe dystonia and head tremor. CONCLUSION Ghrelin may improve extrapyramidal symptoms in patients with RTT.
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Affiliation(s)
- Kotaro Yuge
- Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Munetsugu Hara
- Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Rumiko Okabe
- Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Yuki Nakamura
- Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Hisayoshi Okamura
- Cognitive and Molecular Institute of Brain Diseases, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Shinichiro Nagamitsu
- Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Yushiro Yamashita
- Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
| | - Kenji Orimoto
- Department of General Medicine, Fureai Higashitotuka Hospital, 16-8 Totukaku Kamishinano, Yokohama, Kanagawa 244-0806, Japan
| | - Masayasu Kojima
- Department of Molecular Genetics, Institute of Life Science, Kurume University School of Medicine, Hyakunen-kouen 1-1, Kurume 839-0864, Japan
| | - Toyojiro Matsuishi
- Research Center for Children and Research Center for Rett syndrome, St. Mary's Hospital, 422 Tsubukuhonmachi, Kurume 830-8543, Japan.
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Yu S, Wang X, He X, Wang Y, Gao S, Ren L, Shi Y. Curcumin exerts anti-inflammatory and antioxidative properties in 1-methyl-4-phenylpyridinium ion (MPP(+))-stimulated mesencephalic astrocytes by interference with TLR4 and downstream signaling pathway. Cell Stress Chaperones 2016; 21:697-705. [PMID: 27164829 PMCID: PMC4908001 DOI: 10.1007/s12192-016-0695-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 04/12/2016] [Accepted: 04/23/2016] [Indexed: 01/01/2023] Open
Abstract
Neuroinflammation is closely associated with the pathophysiology of neurodegenerative diseases including Parkinson's disease (PD). Recent evidence indicates that astrocytes also play pro-inflammatory roles in the central nervous system (CNS) by activation with toll-like receptor (TLR) ligands. Therefore, targeting anti-inflammation may provide a promising therapeutic strategy for PD. Curcumin, a polyphenolic compound isolated from Curcuma longa root, has been commonly used for the treatment of neurodegenerative diseases. However, the details of how curcumin exerts neuroprotection remain uncertain. Here, we investigated the protective effect of curcumin on 1-methyl-4-phenylpyridinium ion-(MPP(+)-) stimulated primary astrocytes. Our results showed that MPP(+) stimulation resulted in significant production of tumor necrosis factor (TNF)-α, interleukin (IL-6), and reactive oxygen species (ROS) in primary mesencephalic astrocytes. Curcumin pretreatment decreased the levels of these pro-inflammatory cytokines while increased IL-10 expression in MPP(+)-stimulated astrocytes. In addition, curcumin increased the levels of antioxidant glutathione (GSH) and reduced ROS production. Our results further showed that curcumin decreased the levels of TLR4 and its downstream effectors including NF-κB, IRF3, MyD88, and TIRF that are induced by MPP(+) as well as inhibited the immunoreactivity of TLR4 and morphological activation in MPP(+)-stimulated astrocytes. Together, data suggest that curcumin might exert a beneficial effect on neuroinflammation in the pathophysiology of PD.
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Affiliation(s)
- Song Yu
- Department of Histology and Embryology, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, 110847, People's Republic of China
| | - Xu Wang
- Department of Histology and Embryology, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, 110847, People's Republic of China
| | - Xingliang He
- Department of Sports Medicine, Shenyang Sports University, Shenyang, Liaoning, 110102, People's Republic of China
| | - Yue Wang
- Department of Histology and Embryology, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, 110847, People's Republic of China
| | - Sujie Gao
- Department of Cardiac Function, The Second Staff Hospital of Liaohe Oilfield Company, Panjin, Liaoning, 124011, People's Republic of China
| | - Lu Ren
- Department of Mental Diseases, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning, 110847, People's Republic of China
| | - Yan Shi
- Department of Internal Medicine of Traditional Chinese Medicine, Liaoning University of Traditional Chinese Medicine, 79 East Chongshan Road, Shenyang, Liaoning, 110847, People's Republic of China.
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Ghrelin and Neurodegenerative Disorders-a Review. Mol Neurobiol 2016; 54:1144-1155. [PMID: 26809582 DOI: 10.1007/s12035-016-9729-1] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 01/14/2016] [Indexed: 12/13/2022]
Abstract
Ghrelin, the endogenous ligand of the growth hormone secretagogue receptor 1a (GHS-R1a), is a gut-derived, orexigenic peptide hormone that primarily regulates growth hormone secretion, food intake, and energy homeostasis. With the wide expression of GHS-R1a in extra-hypothalamic regions, the physiological role of ghrelin is more extensive than solely its involvement in metabolic function. Ghrelin has been shown to be involved in numerous higher brain functions, such as memory, reward, mood, and sleep. Some of these functions are disrupted in neurodegenerative disorders, including Parkinson's disease (PD), Alzheimer's disease (AD), and Huntington's disease (HD). This link between ghrelin and these neurodegenerative diseases is supported by numerous studies. This review aims to provide a comprehensive overview of the most recent evidence of the novel neuromodulatory role of ghrelin in PD, AD, and HD. Moreover, the changes in circulating and/or central ghrelin levels that are associated with disease progression are also postulated to be a biomarker for clinical diagnosis and therapy.
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Wang SY, Chen L, Xue Y, Xia YJ. Substance P prevents 1-methyl-4-phenylpyridinium-induced cytotoxicity through inhibition of apoptosis via neurokinin-1 receptors in MES23.5 cells. Mol Med Rep 2015; 12:8085-92. [PMID: 26497672 DOI: 10.3892/mmr.2015.4464] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 08/25/2015] [Indexed: 11/06/2022] Open
Abstract
[Sar9, Met(O2)11] termed Substance P (SP), is an effective and selective agonist for the neurokinin‑1 (NK‑1) receptors, which are synthetic peptides, similar in structure to SP. SP is an important neurotransmitter or neuromodulator mediated by neurokinin receptors, namely the SP receptor in the central nervous system. The excitatory effects induced by SP may be selectively inhibited by a neurokinin‑1 receptor antagonist, such as SR140333B. It has been proposed that Parkinson's disease (PD) is primarily caused by the loss of trophic peptidergic neurotransmitter, possibly SP, which may lead to the degeneration of neurons. In previous studies, 1‑methyl‑4‑phenylpyridinium (MPP+) has been frequently utilized to establish animal or cell models of PD. In the present study, to further investigate the effects of SP in PD, MPP+ was employed to investigate the promising anti‑apoptotic effects of SP, and examine the underlying mechanisms of the pathology in the MES23.5 dopaminergic cell line. The results indicated that MPP+‑triggered apoptosis was prevented by treatment with SP. SP treatment also decreased the MPP+‑triggered Ca2+ influx, caspase‑3 re‑activity, reactive oxygen species production and mitochondrial membrane potential decrease. Treatment with MPP+ also induced phosphorylation of c‑Jun N‑terminal kinase and p38 mitogen‑activated protein kinase. In addition, treatment with SP inhibited the MPP+‑triggered neurotoxicity in MES23.5 cells. However, no changes were observed in SR140333B+SP+MPP+‑treated MES23.5 cell lines. In conclusion, SP could protect the cells from MPP+‑induced cytotoxicity by inhibiting the apoptosis via NK-1 receptors.
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Affiliation(s)
- Shuang-Yan Wang
- Department of Physiology, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Lei Chen
- Department of Physiology, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Yan Xue
- Department of Physiology, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Yu-Jun Xia
- Department of Anatomy, Qingdao University, Qingdao, Shandong 266071, P.R. China
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Omrani H, Alipour MR, Mohaddes G. Ghrelin Improves Antioxidant Defense in Blood and Brain in Normobaric Hypoxia in Adult Male Rats. Adv Pharm Bull 2015; 5:283-8. [PMID: 26236669 DOI: 10.15171/apb.2015.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 09/30/2014] [Accepted: 10/18/2014] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Hypoxia is one of the important factors in formation of reactive oxygen species (ROS). Ghrelin is a peptide hormone that reduces oxidative stress. However, antioxidant effect of ghrelin on blood and brain in normobaric hypoxia condition has not yet been investigated. METHODS thirty-two animals were randomly divided into four (n=8) experimental groups: Control (C), ghrelin (Gh), hypoxia (H), hypoxic animals that received ghrelin (H+Gh). Normobaric systemic hypoxia (11% O2) was induced in rats for 48 hours. Effect of ghrelin (80 μg/kg, i.p) on serum TAC and MDA and brain SOD, CAT, GPx and MDA were assessed. RESULTS Hypoxia significantly (p<0.001) increased both blood and brain MDA Levels. Ghrelin treatment significantly (p<0.001) decreased blood MDA levels both in control and hypoxia, and brain MDA levels in hypoxia conditions. Brain SOD, CAT and GPx variations were not significant in two days of hypoxia. Ghrelin treatment also could not significantly increase activity of SOD, CAT and GPx in brain. Total antioxidant capacity of serum increased in ghrelin treatment both in control and hypoxic conditions, although it was only significant (p<0.01) in control conditions. CONCLUSION Our findings showed that administration of ghrelin may be useful in reducing blood and brain oxidative stress in normobaric hypoxia condition.
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Affiliation(s)
- Hasan Omrani
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Reza Alipour
- Tuberculosis and Lung Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Gisou Mohaddes
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Potential ghrelin-mediated benefits and risks of hydrogen water. Med Hypotheses 2015; 84:350-5. [PMID: 25649854 DOI: 10.1016/j.mehy.2015.01.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 01/15/2015] [Indexed: 12/12/2022]
Abstract
Molecular hydrogen (H2) can scavenge hydroxyl radical and diminish the toxicity of peroxynitrite; hence, it has interesting potential for antioxidant protection. Recently, a number of studies have explored the utility of inhaled hydrogen gas, or of hydrogen-saturated water, administered parenterally or orally, in rodent models of pathology and in clinical trials, oftentimes with very positive outcomes. The efficacy of orally ingested hydrogen-rich water (HW) has been particularly surprising, given that only transient and rather small increments in plasma hydrogen can be achieved by this method. A recent study in mice has discovered that orally administered HW provokes increased gastric production of the orexic hormone ghrelin, and that this ghrelin mediates the favorable impact of HW on a mouse model of Parkinson's disease. The possibility that most of the benefits observed with HW in experimental studies are mediated by ghrelin merits consideration. Ghrelin is well known to function as an appetite stimulant and secretagogue for growth hormone, but it influences physiological function throughout the body via interaction with the widely express GHS-R1a receptor. Rodent and, to a more limited extent, clinical studies establish that ghrelin has versatile neuroprotective and cognitive enhancing activity, favorably impacts vascular health, exerts anti-inflammatory activity useful in autoimmune disorders, and is markedly hepatoprotective. The stimulatory impact of ghrelin on GH-IGF-I activity, while potentially beneficial in sarcopenia or cachectic disorders, does raise concerns regarding the long-term impact of ghrelin up-regulation on cancer risk. The impact of ingesting HW water on ghrelin production in humans needs to be evaluated; if HW does up-regulate ghrelin in humans, it may have versatile potential for prevention and control of a number of health disorders.
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Tsou YH, Shih CT, Ching CH, Huang JY, Jen CJ, Yu L, Kuo YM, Wu FS, Chuang JI. Treadmill exercise activates Nrf2 antioxidant system to protect the nigrostriatal dopaminergic neurons from MPP+ toxicity. Exp Neurol 2014; 263:50-62. [PMID: 25286336 DOI: 10.1016/j.expneurol.2014.09.021] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 08/22/2014] [Accepted: 09/27/2014] [Indexed: 10/24/2022]
Abstract
Exercise induces oxidative stress, which may activate adaptive antioxidant responses. Nuclear factor erythroid 2-related factor 2 (Nrf2) plays an important role in the defense of oxidative stress by regulating the expression of antioxidant enzymes, gamma-glutamylcysteine ligase (γGCL) and heme oxygenase-1 (HO-1). We investigated whether treadmill exercise protects dopaminergic neurons by regulating the Nrf2 antioxidant system in a 1-methyl-4-phenylpyridine (MPP(+))-induced parkinsonian rat model. We found that MPP(+) induced early decreases in total glutathione level and Nrf2/γGCLC (catalytic subunit of γGCL) expression, but late upregulation of HO-1 expression in association with loss of nigral dopaminergic neurons and downregulation of tyrosine hydroxylase and dopamine transporter expression in the striatum. Treadmill exercise for 4weeks induced upregulation of Nrf2 and γGCLC expression, and also prevented the MPP(+)-induced downregulation of Nrf2/γGCLC/glutathione, HO-1 upregulation, and nigrostriatal dopaminergic neurodegeneration. Moreover, the protective effect of exercise was blocked by the knockdown of Nrf2 using a lentivirus-carried shNrf2 delivery system. These results demonstrate an essential role of Nrf2 in the exercise-mediated protective effect that exercise enhances the nigrostriatal Nrf2 antioxidant defense capacity to protect dopaminergic neurons against the MPP(+)-induced toxicity.
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Affiliation(s)
- Yi-Hsien Tsou
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Ching-Ting Shih
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Cheng-Hsin Ching
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Jui-Yen Huang
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Chauying J Jen
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Lung Yu
- Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Yu-Min Kuo
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Fong-Sen Wu
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Jih-Ing Chuang
- Department of Physiology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC.
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Dobutovic B, Sudar E, Tepavcevic S, Djordjevic J, Djordjevic A, Radojcic M, Isenovic ER. Effects of ghrelin on protein expression of antioxidative enzymes and iNOS in the rat liver. Arch Med Sci 2014; 10:806-16. [PMID: 25276168 PMCID: PMC4175782 DOI: 10.5114/aoms.2014.44872] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 01/14/2013] [Accepted: 02/24/2013] [Indexed: 01/17/2023] Open
Abstract
INTRODUCTION We investigated the effects of ghrelin on protein expression of the liver antioxidant enzymes superoxide dismutases (SODs), catalase (CAT), glutathione peroxidase (GPx), and glutathione reductase (GR), nuclear factor κB (NFκB) and inducible nitric oxide synthase (iNOS). Furthermore, we aimed to investigate whether extracellular regulated protein kinase (ERK1/2) and protein kinase B (Akt) are involved in ghrelin-regulated liver antioxidant enzymes and iNOS protein expression. MATERIAL AND METHODS Male Wistar rats were treated with ghrelin (0.3 nmol/5 µl) injected into the lateral cerebral ventricle every 24 h for 5 days, and 2 h after the last treatment the animals were sacrificed and the liver excised. The Western blot method was used to determine expression of antioxidant enzymes, iNOS, phosphorylation of Akt, ERK1/2 and nuclear factor κB (NFκB) subunits 50 and 65. RESULTS There was significantly higher protein expression of CuZnSOD (p < 0.001), MnSOD (p < 0.001), CAT (p < 0.001), GPx, (p < 0.001), and GR (p < 0.01) in the liver isolated from ghrelin-treated animals compared with control animals. In contrast, ghrelin significantly (p < 0.01) reduced protein expression of iNOS. In addition, phosphorylation of NFκB subunits p65 and p50 was significantly (p < 0.001 for p65; p < 0.05 for p50) reduced by ghrelin when compared with controls. Phosphorylation of ERK1/2 and of Akt was significantly higher in ghrelin-treated than in control animals (p < 0.05 for ERK1/2; p < 0.01 for Akt). CONCLUSIONS The results show that activation of Akt and ERK1/2 is involved in ghrelin-mediated regulation of protein expression of antioxidant enzymes and iNOS in the rat liver.
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Affiliation(s)
- Branislava Dobutovic
- Laboratory for Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Emina Sudar
- Laboratory for Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Snezana Tepavcevic
- Laboratory for Molecular Biology and Endocrinology, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Jelena Djordjevic
- Laboratory for Molecular Biology and Endocrinology, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Ana Djordjevic
- Laboratory for Molecular Biology and Endocrinology, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Marija Radojcic
- Laboratory for Molecular Biology and Endocrinology, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Esma R. Isenovic
- Laboratory for Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
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Mirzaie Bavil F, Mohaddes G, Ebrahimi H, Keyhanmanesh R, Ghiyasi R, Alipour MR. Ghrelin increases lymphocytes in chronic normobaric hypoxia. Adv Pharm Bull 2014; 4:339-43. [PMID: 25436188 DOI: 10.5681/apb.2014.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 03/17/2014] [Accepted: 04/05/2014] [Indexed: 12/26/2022] Open
Abstract
PURPOSE Hypoxia is a condition of decreased availability of oxygen. To adapt hypoxia, some changes in blood cells occur in the body. The aim of this study was to evaluate the effect of ghrelin on different types of blood cell in normobaric hypoxia situation. METHODS Thirty-two animals were divided in 4 groups (n=8): control (C), ghrelin (G), hypoxia (H), and hypoxic animals that received ghrelin (H+G). Hypoxia (11%) was induced by an Environmental Chamber System GO2 Altitude. Animals in ghrelin groups received a subcutaneous injection of ghrelin (150 μg/kg/day) for 14 days. RESULTS Our results show that ghrelin significantly (p<0.05) increased RBC and Hct levels, whereas it significantly (p<0.05) decreased lymphocytes in the blood. RBC, Hct, Hb concentration, platelet and MCV increased significantly (p<0.05) in hypoxic conditions but lymphocytes, monocytes and Polymorphonuclears did not show any significant changes. Platelets had a significant (p<0.05) decrease in hypoxic conditions and ghrelin administration in hypoxic conditions could increase lymphocyte levels significantly (p<0.05). CONCLUSION Effect of ghrelin on blood cells could be related to blood oxygen level. Ghrelin in normal oxygen conditions increases RBC and Hct levels but decreases lymphocytes, whereas in hypoxic conditions, ghrelin increases blood lymphocytes.
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Affiliation(s)
- Fariba Mirzaie Bavil
- Tuberculosis and Lung Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Gisou Mohaddes
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hadi Ebrahimi
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rana Keyhanmanesh
- Tuberculosis and Lung Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rafigheh Ghiyasi
- Department of Physiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Reza Alipour
- Tuberculosis and Lung Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Ma W, Yuan L, Yu H, Xi Y, Xiao R. Mitochondrial dysfunction and oxidative damage in the brain of diet-induced obese rats but not in diet-resistant rats. Life Sci 2014; 110:53-60. [PMID: 25058918 DOI: 10.1016/j.lfs.2014.07.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 06/19/2014] [Accepted: 07/12/2014] [Indexed: 12/11/2022]
Abstract
AIMS It has been suggested that obesity triggered by consuming a high-fat diet (HF) can account for oxidative damage and mitochondrial dysfunction. Thus, we aim to explore the oxidative stress and mitochondrial dysfunction detected in the brain of diet-induced obese (DIO) rats. MAIN METHODS Sprague-Dawley (SD) rats were fed either a HF diet or a normal-fat (NF) diet for 10weeks to obtain the control (CON), DIO and diet-resistant (DR) rats. d-Galactose was injected subcutaneously for 10weeks to establish oxidative stress model (MOD) rats. Then, the levels of total antioxidant capacity (T-AOC), lipid peroxidation (LPO), malondialdehyde (MDA), both in plasma and brain tissue, and catalase (CAT) in plasma were measured using enzymic assay kits and the levels of ghrelin, neuropeptide Y (NPY) and leptin in both plasma and brain tissue were measured by using enzyme-linked immunosorbent assay (ELISA) kits. Mitochondrial reactive oxygen species (ROS) formation in brain tissues was detected with 2, 7-dichlorofluorescein diacetate (DCFH2-DA) dyeing. The mitochondrial membrane potential (MMP) was measured with tetrachloro-tetraethyl benzimidazol carbocyanine iodide (JC-1) by a flow cytometer. KEY FINDINGS HF diet leads to an obese or DR state characterized by increased or decreased adiposity. The HF diet increased brain LPO, which was accompanied by lower ghrelin levels in DIO rats compared with DR rats. In addition, the increased mitochondrial ROS and lower MMP were detected in DIO rat comparing with DR rats. SIGNIFICANCE The current results demonstrated that mitochondrial dysfunction and oxidative damage in the brains of DIO rats, induced by HF diets, might be measurable.
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Affiliation(s)
- Weiwei Ma
- School of Public Health, Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Linhong Yuan
- School of Public Health, Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Huanling Yu
- School of Public Health, Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Yuandi Xi
- School of Public Health, Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China
| | - Rong Xiao
- School of Public Health, Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
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Prodam F, Filigheddu N. Ghrelin gene products in acute and chronic inflammation. Arch Immunol Ther Exp (Warsz) 2014; 62:369-84. [PMID: 24728531 DOI: 10.1007/s00005-014-0287-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 03/21/2014] [Indexed: 12/27/2022]
Abstract
Ghrelin gene products--the peptides ghrelin, unacylated ghrelin, and obestatin--have several actions on the immune system, opening new perspectives within neuroendocrinology, metabolism and inflammation. The aim of this review is to summarize the available evidence regarding the less known role of these peptides in the machinery of inflammation and autoimmunity, outlining some of their most promising therapeutic applications.
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Affiliation(s)
- Flavia Prodam
- Departmant of Health Sciences, Università del Piemonte Orientale "Amedeo Avogadro", Novara, Italy
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Khan MM, Kempuraj D, Zaheer S, Zaheer A. Glia maturation factor deficiency suppresses 1-methyl-4-phenylpyridinium-induced oxidative stress in astrocytes. J Mol Neurosci 2014; 53:590-9. [PMID: 24430624 DOI: 10.1007/s12031-013-0225-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 12/26/2013] [Indexed: 12/11/2022]
Abstract
Inflammation is closely intertwined with pathogenesis of Parkinson's disease (PD). Increasing evidence suggests that inhibition of glia-mediated inflammation might represent a promising therapeutic target for PD. Glia maturation factor (GMF), an inflammatory protein, predominantly localized in astrocytes is previously isolated, sequenced and cloned in our laboratory. In the present investigation, we demonstrate that GMF-deficiency in astrocytes upregulates the antioxidant status and limit the extent of lipid peroxidation and production of reactive oxygen species (ROS) along with diminished nuclear factor-κB-mediated inflammatory responses in 1-methyl-4-phenylpyridinium (MPP(+))-induced toxicity. Primary astrocytes obtained from wild-type (Wt) and GMF-deficient (GMF-KO) mice were treated with 5, 10, and 20 μM MPP(+) for 24, 48, and 72 h in vitro. Our results show decreased release of ROS and increased level of glutathione in astrocytes obtained from GMF-KO mice when compared to astrocytes derived from Wt mice following MPP(+) treatment. Additionally, we found decreased activity of NF-κB, and reduced levels of proinflammatory tumor necrosis factor- α, interleukin-1β (IL-1β), IL-17, IL-33, and chemokine (C-C motif) ligand 2 (CCL2) in GMF-KO astrocytes when compared to Wt astrocytes. Our overall results suggest that GMF-KO astrocytes are significantly resistant to MPP(+) toxicity when compared to Wt astrocytes.
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27
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Pyszko J, Strosznajder JB. Sphingosine kinase 1 and sphingosine-1-phosphate in oxidative stress evoked by 1-methyl-4-phenylpyridinium (MPP+) in human dopaminergic neuronal cells. Mol Neurobiol 2014; 50:38-48. [PMID: 24399507 DOI: 10.1007/s12035-013-8622-4] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 12/15/2013] [Indexed: 12/21/2022]
Abstract
Sphingosine kinases (Sphk1/2) are crucial enzymes in regulation of the biostat between sphingosine-1-phosphate (S1P) and ceramide and play an important role in the pathogenesis/pathomechanism of Alzheimer's disease (AD). These enzymes synthesise S1P, which regulates neurotransmission, synaptic function and neuron cell proliferation, by activating five G protein-coupled receptors (S1P1-5). However, S1P synthesised by Sphk2 could be involved in amyloid β (Aβ) release by stimulation of Aβ precursor protein degradation. The significance of this bioactive sphingolipid in the pathogenesis of Parkinson's disease (PD) is unknown. The aim of our study was to investigate the expression level of Sphk1 and its role in human dopaminergic neuronal cell (SH-SY5Y) viability under oxidative stress, evoked by 1-methyl-4-phenylpyridinium (MPP+). Moreover, the mechanism of S1P action on the death signalling pathway in these experimental conditions was evaluated. Our study indicated marked downregulation of Sphk1 expression in this cellular PD model. Inhibition of Sphk1 decreased SH-SY5Y cell viability and concomitantly enhanced the reactive oxygen species (ROS) level. It was found that exogenous S1P (1 μM) exerted the neuroprotective effect by activation of Sphk1 and S1P1 receptor gene expression. Moreover, S1P downregulated Bax and harakiri, death protein 5 (Hrk/DP5) expression and enhanced cell viability in MPP+-treated cells. The neuroprotective mechanism of S1P is mainly dependent on S1P1 receptor signalling, which was indicated by using specific agonists and antagonists of S1P1 receptor. The results show that S1P and S1P1 receptor agonists protected a significant population of neuronal cells against death.
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Affiliation(s)
- Joanna Pyszko
- Department of Cellular Signalling, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
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28
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Iron status and lipopolysaccharide regulate Ndfip1 by activation of nuclear factor-kappa B. Biometals 2013; 26:981-8. [DOI: 10.1007/s10534-013-9674-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 09/02/2013] [Indexed: 02/08/2023]
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Beynon AL, Brown MR, Wright R, Rees MI, Sheldon IM, Davies JS. Ghrelin inhibits LPS-induced release of IL-6 from mouse dopaminergic neurones. J Neuroinflammation 2013; 10:40. [PMID: 23509933 PMCID: PMC3614890 DOI: 10.1186/1742-2094-10-40] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 01/23/2013] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Ghrelin is an orexigenic stomach hormone that acts centrally to increase mid-brain dopamine neurone activity, amplify dopamine signaling and protect against neurotoxin-induced dopamine cell death in the mouse substantia nigra pars compacta (SNpc). In addition, ghrelin inhibits the lipopolysaccharide (LPS)-induced release of pro-inflammatory cytokines from peripheral macrophages, T-cells and from LPS stimulated microglia. Here we sought to determine whether ghrelin attenuates pro-inflammatory cytokine release from dopaminergic neurones. FINDINGS The dopaminergic SN4741 cell-line, which derives from the mouse substantia nigra (SN) and expresses the ghrelin-receptor (growth hormone secretagogue receptor (GHS-R)) and the ghrelin-O-acyl transferase (GOAT) enzyme, was used to determine the neuro-immunomodulatory action of ghrelin. We induced innate immune activation via LPS challenge (1 μg/ml) of SN4741 neurones that had been pre-cultured in the presence or absence of ghrelin (1, 10, 100 nM) for 4 h. After 24 h supernatants were collected for detection of IL-1 beta (IL-1β ), TNF alpha (TNF-α) and IL-6 cytokines via enzyme linked immunosorbent assay (ELISA) analysis. Nuclear translocation of the transcription factor nuclear factor kappa B (NF-κB) was analyzed by Western blotting, and to determine viability of treatments a cell viability assay and caspase-3 immunohistochemistry were performed.We provide evidence that while IL-1β and TNF-α were not detectable under any conditions, SN4741 neurones constitutively released IL-6 under basal conditions and treatment with LPS significantly increased IL-6 secretion. Pre-treatment of neurones with ghrelin attenuated LPS-mediated IL-6 release at 24 h, an affect that was inhibited by the GHS-R antagonist [D-Lys3]-GHRP-6. However, while ghrelin pre-treatment attenuated the LPS-mediated increase in NF-κB, there was no alteration in its nuclear translocation. Cell viability assay and caspase-3 immunocytochemistry demonstrated that the results were independent from activation of cytotoxic and/or apoptotic mechanisms in the neuronal population, respectively. CONCLUSION Our results provide evidence that the gut-hormone, ghrelin, attenuates IL-6 secretion to LPS challenge in mid-brain dopaminergic neurones. These data suggest that ghrelin may protect against dopaminergic SN nerve cell damage or death via modulation of the innate immune response.
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Affiliation(s)
- Amy L Beynon
- Molecular Neuroscience, Swansea University, Swansea, SA28PP, UK
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30
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Liu SP, Li XY, Li Z, He LN, Xiao Y, Yan K, Zhou ZG. Octanoylated Ghrelin Inhibits the Activation of the Palmitic Acid-Induced TLR4/NF-κB Signaling Pathway in THP-1 Macrophages. ISRN ENDOCRINOLOGY 2012; 2012:237613. [PMID: 23251812 PMCID: PMC3513732 DOI: 10.5402/2012/237613] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 10/24/2012] [Indexed: 12/20/2022]
Abstract
To investigate the effect of acylated ghrelin on the activation of TLR4/NF-κB signaling pathway induced by palmitic acid in human monocyte-derived (THP-1) macrophages, THP-1 macrophages were cultured for 12 h by palmitic acid with various concentrations. The THP-1 macrophages was pretreated by acylated ghrelin at different doses for 4 h before cultivated by palmitic acid (200 μmol/L) for 12 h. We observed the level of TLR4, NF-κB p65 phosphorylation in THP-1 macrophages and TNF-α, IL-1β in culture supernatant. TLR4 mRNA was measured by real-time PCR. TLR4 protein and NF-κB p65 phosphorylation was measured by western blotting. The expression of TNF-α and IL-1β was detected by ELISA. Compared to the THP-1 macrophages without palmitic acid, the level of TLR4 mRNA protein and NF-κB p65 phosphorylation and the expression of TNF-α and IL-1β increased after treatment by palmitic acid in a dose-dependent fashion (P < 0.05). Compared to the THP-1 macrophages with palmitic acid (200 μmol/L), the level of the pervious substances decreased after preadministration by acylated ghrelin in a dose-dependent fashion. So, we make a conclusion that acylated ghrelin can regulate the activation of TLR4/NF-κB signaling pathway and inhibit the release of inflammatory cytokines in THP-1 macrophages which are stimulated by palmitic acid in a dose-dependent fashion.
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Affiliation(s)
- S P Liu
- Diabetes Center, 2nd Xiangya Hospital, Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology of Ministry of Education, Central South University, 139 Renmin-Zhong Road, Hunan, Changsha 410011, China
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Barazzoni R, Zanetti M, Semolic A, Cattin MR, Pirulli A, Cattin L, Guarnieri G. High-fat diet with acyl-ghrelin treatment leads to weight gain with low inflammation, high oxidative capacity and normal triglycerides in rat muscle. PLoS One 2011; 6:e26224. [PMID: 22039445 PMCID: PMC3198460 DOI: 10.1371/journal.pone.0026224] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Accepted: 09/22/2011] [Indexed: 11/22/2022] Open
Abstract
Obesity is associated with muscle lipid accumulation. Experimental models suggest that inflammatory cytokines, low mitochondrial oxidative capacity and paradoxically high insulin signaling activation favor this alteration. The gastric orexigenic hormone acylated ghrelin (A-Ghr) has antiinflammatory effects in vitro and it lowers muscle triglycerides while modulating mitochondrial oxidative capacity in lean rodents. We tested the hypothesis that A-Ghr treatment in high-fat feeding results in a model of weight gain characterized by low muscle inflammation and triglycerides with high muscle mitochondrial oxidative capacity. A-Ghr at a non-orexigenic dose (HFG: twice-daily 200-µg s.c.) or saline (HF) were administered for 4 days to rats fed a high-fat diet for one month. Compared to lean control (C) HF had higher body weight and plasma free fatty acids (FFA), and HFG partially prevented FFA elevation (P<0.05). HFG also had the lowest muscle inflammation (nuclear NFkB, tissue TNF-alpha) with mitochondrial enzyme activities higher than C (P<0.05 vs C, P = NS vs HF). Under these conditions HFG prevented the HF-associated muscle triglyceride accumulation (P<0.05). The above effects were independent of changes in redox state (total-oxidized glutathione, glutathione peroxidase activity) and were not associated with changes in phosphorylation of AKT and selected AKT targets. Ghrelin administration following high-fat feeding results in a novel model of weight gain with low inflammation, high mitochondrial enzyme activities and normalized triglycerides in skeletal muscle. These effects are independent of changes in tissue redox state and insulin signaling, and they suggest a potential positive metabolic impact of ghrelin in fat-induced obesity.
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Affiliation(s)
- Rocco Barazzoni
- Clinica Medica-Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy.
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Chen JH, Huang SM, Chen CC, Tsai CF, Yeh WL, Chou SJ, Hsieh WT, Lu DY. Ghrelin induces cell migration through GHS-R, CaMKII, AMPK, and NF-κB signaling pathway in glioma cells. J Cell Biochem 2011; 112:2931-41. [DOI: 10.1002/jcb.23209] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Cetin E, Kanbur M, Cetin N, Eraslan G, Atasever A. Hepatoprotective effect of ghrelin on carbon tetrachloride-induced acute liver injury in rats. ACTA ACUST UNITED AC 2011; 171:1-5. [PMID: 21640759 DOI: 10.1016/j.regpep.2011.05.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Revised: 04/19/2011] [Accepted: 05/17/2011] [Indexed: 12/30/2022]
Abstract
BACKGROUND & AIMS Recent studies have revealed that ghrelin may be an antioxidant and antiinflammatory agent. Oxidative stress are considered to play a prominent causative role in the development of various hepatic disorders. We investigated whether ghrelin plays a protective role against carbon tetrachloride (CCl(4))-induced acute liver injury in rats. METHODS Forty adult male Sprague-Dawley rats were randomly divided into four equal groups as; control, ghrelin, CCl(4) and ghrelin plus CCl(4). Evaluations were made for lipid peroxidation, enzyme activities and biochemical parameters. Pathological histology was also performed. RESULTS CCl(4) treatment increased plasma and liver tissue malondialdehyde (MDA) content and plasma nitric oxide (NO) level, and decreased erythrocyte and liver tissue superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) activities when compared to control group. At the same time, CCl(4) treatment increased the serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alcaline phosphatase (ALP) activities. By contrast, ghrelin pretreatment reduced plasma and liver MDA content and plasma NO level, and increased erythrocyte and liver tissue SOD, CAT and GPx activities when compared with CCl(4)-treated group. Moreover, both ghrelin alone and ghrelin plus CCl(4) treatment elevated serum glucose level. The CCl(4)-induced histopathological changes were also reduced by the ghrelin pretreatment. CONCLUSION Our results show that ghrelin can be proposed to protect the liver against CCl(4)-induced oxidative damage in rats, and the hepatoprotective effect may be correlated with its antioxidant and free radical scavenger effects.
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Affiliation(s)
- Ebru Cetin
- Department of Physiology, Faculty of Veterinary Medicine, University of Erciyes, Kayseri, Turkey.
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Current world literature. Curr Opin Endocrinol Diabetes Obes 2011; 18:83-98. [PMID: 21178692 DOI: 10.1097/med.0b013e3283432fa7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Li W, Wu Y, Ren C, Lu Y, Gao Y, Zheng X, Zhang C. The activity of recombinant human neuroglobin as an antioxidant and free radical scavenger. Proteins 2010; 79:115-25. [DOI: 10.1002/prot.22863] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 08/14/2010] [Accepted: 08/23/2010] [Indexed: 11/06/2022]
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Clark J, Clore EL, Zheng K, Adame A, Masliah E, Simon DK. Oral N-acetyl-cysteine attenuates loss of dopaminergic terminals in alpha-synuclein overexpressing mice. PLoS One 2010; 5:e12333. [PMID: 20808797 PMCID: PMC2925900 DOI: 10.1371/journal.pone.0012333] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Accepted: 07/29/2010] [Indexed: 11/18/2022] Open
Abstract
Levels of glutathione are lower in the substantia nigra (SN) early in Parkinson's disease (PD) and this may contribute to mitochondrial dysfunction and oxidative stress. Oxidative stress may increase the accumulation of toxic forms of α-synuclein (SNCA). We hypothesized that supplementation with n-acetylcysteine (NAC), a source of cysteine – the limiting amino acid in glutathione synthesis, would protect against α-synuclein toxicity. Transgenic mice overexpressing wild-type human α-synuclein drank water supplemented with NAC or control water supplemented with alanine from ages 6 weeks to 1 year. NAC increased SN levels of glutathione within 5–7 weeks of treatment; however, this increase was not sustained at 1 year. Despite the transient nature of the impact of NAC on brain glutathione, the loss of dopaminergic terminals at 1 year associated with SNCA overexpression was significantly attenuated by NAC supplementation, as measured by immunoreactivity for tyrosine hydroxylase in the striatum (p = 0.007; unpaired, two-tailed t-test), with a similar but nonsignificant trend for dopamine transporter (DAT) immunoreactivity. NAC significantly decreased the levels of human SNCA in the brains of PDGFb-SNCA transgenic mice compared to alanine treated transgenics. This was associated with a decrease in nuclear NFκB localization and an increase in cytoplasmic localization of NFκB in the NAC-treated transgenics. Overall, these results indicate that oral NAC supplementation decreases SNCA levels in brain and partially protects against loss of dopaminergic terminals associated with overexpression of α-synuclein in this model.
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Affiliation(s)
- Joanne Clark
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Elizabeth L. Clore
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States of America
| | - Kangni Zheng
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States of America
| | - Anthony Adame
- Department of Neuroscience, School of Medicine, University of Southern California, San Diego, California, United States of America
| | - Eliezer Masliah
- Department of Neuroscience, School of Medicine, University of Southern California, San Diego, California, United States of America
| | - David K. Simon
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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