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Magrì A, Tomasello B, Naletova I, Tabbì G, Cairns WRL, Greco V, Sciuto S, La Mendola D, Rizzarelli E. New BDNF and NT-3 Cyclic Mimetics Concur with Copper to Activate Trophic Signaling Pathways as Potential Molecular Entities to Protect Old Brains from Neurodegeneration. Biomolecules 2024; 14:1104. [PMID: 39334869 PMCID: PMC11430436 DOI: 10.3390/biom14091104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2024] [Accepted: 08/30/2024] [Indexed: 09/30/2024] Open
Abstract
A low level of Neurotrophins (NTs), their Tyrosine Kinase Receptors (Trks), Vascular Endothelial Growth Factors (VEGFs) and their receptors, mainly VEGFR1 and VEGFR2, characterizes AD brains. The use of NTs and VEGFs as drugs presents different issues due to their low permeability of the blood-brain barrier, the poor pharmacokinetic profile, and the relevant side effects. To overcome these issues, different functional and structural NT mimics have been employed. Being aware that the N-terminus domain as the key domain of NTs for the binding selectivity and activation of Trks and the need to avoid or delay proteolysis, we herein report on the mimicking ability of two cyclic peptide encompassing the N-terminus of Brain Derived Growth Factor (BDNF), (c-[HSDPARRGELSV-]), cBDNF(1-12) and of Neurotrophin3 (NT3), (c-[YAEHKSHRGEYSV-]), cNT3(1-13). The two cyclic peptide features were characterized by a combined thermodynamic and spectroscopic approach (potentiometry, NMR, UV-vis and CD) that was extended to their copper(II) ion complexes. SH-SY5Y cell assays show that the Cu2+ present at the sub-micromolar level in the complete culture media affects the treatments with the two peptides. cBDNF(1-12) and cNT3(1-13) act as ionophores, induce neuronal differentiation and promote Trks and CREB phosphorylation in a copper dependent manner. Consistently, both peptide and Cu2+ stimulate BDNF and VEGF expression as well as VEGF release; cBDNF(1-12) and cNT3(1-13) induce the expression of Trks and VEGFRs.
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Affiliation(s)
- Antonio Magrì
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (A.M.); (I.N.); (G.T.)
| | - Barbara Tomasello
- Department of Drug and Health Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy;
| | - Irina Naletova
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (A.M.); (I.N.); (G.T.)
| | - Giovanni Tabbì
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (A.M.); (I.N.); (G.T.)
| | - Warren R. L. Cairns
- CNR-Institute of Polar Sciences (CNR-ISP), 155 Via Torino, 30172 Venice, Italy;
| | - Valentina Greco
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (V.G.); (S.S.)
| | - Sebastiano Sciuto
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (V.G.); (S.S.)
| | - Diego La Mendola
- Department of Pharmacy, University of Pisa, via Bonanno Pisano 6, 56126 Pisa, Italy;
| | - Enrico Rizzarelli
- Institute of Crystallography, National Council of Research (CNR), P. Gaifami 18, 95126 Catania, Italy; (A.M.); (I.N.); (G.T.)
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (V.G.); (S.S.)
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Wu Y, Wang Y, Lu Y, Yan J, Zhao H, Yang R, Pan J. Research advances in huntingtin-associated protein 1 and its application prospects in diseases. Front Neurosci 2024; 18:1402996. [PMID: 38975245 PMCID: PMC11224548 DOI: 10.3389/fnins.2024.1402996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Accepted: 06/06/2024] [Indexed: 07/09/2024] Open
Abstract
Huntingtin-associated protein 1 (HAP1) was the first protein discovered to interact with huntingtin. Besides brain, HAP1 is also expressed in the spinal cord, dorsal root ganglion, endocrine, and digestive systems. HAP1 has diverse functions involving in vesicular transport, receptor recycling, gene transcription, and signal transduction. HAP1 is strongly linked to several neurological diseases, including Huntington's disease, Alzheimer's disease, epilepsy, ischemic stroke, and depression. In addition, HAP1 has been proved to participate in cancers and diabetes mellitus. This article provides an overview of HAP1 regarding the tissue distribution, cell localization, functions, and offers fresh perspectives to investigate its role in diseases.
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Affiliation(s)
| | | | | | | | | | | | - Jingying Pan
- Department of Histology and Embryology, Medical School of Nantong University, Nantong, China
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He M, Liu Z, Lian T, Guo P, Zhang W, Huang Y, Zhang Y, Liu G, Zhang W, Li J, Guan H, Zhang W, Luo D, Qi J, Yue H, Wang X, Zhang W. Role of nerve growth factor on cognitive impairment in patients with Alzheimer's disease carrying apolipoprotein E ε4. CNS Neurosci Ther 2024; 30:e14560. [PMID: 38112032 PMCID: PMC11163191 DOI: 10.1111/cns.14560] [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] [Received: 09/27/2023] [Revised: 11/23/2023] [Accepted: 11/25/2023] [Indexed: 12/20/2023] Open
Abstract
AIMS To investigate the roles of neurotrophic factors on cognition in patients with Alzheimer's disease (AD) carrying Apolipoprotein E (APOE) ε4. METHODS Totals of 173 patients with AD were divided into APOE ε4 carrier and non-carrier groups, and their demographics, cognition, and neurotrophic factors in cerebrospinal fluid (CSF) were compared. Multiple linear regression analyses were performed to assess correlations among APOE ε4, neurotrophic factors and cognition. Mediation analyses were conducted to assess the sequential associations among APOE ε4, nerve growth factor (NGF), and cognition. RESULTS Global cognition and multiple domains were impaired in the APOE ε4 carrier group (all p < 0.05). NGF level in the APOE ε4 carrier group was lower than that in the non-carrier group (p = 0.016). NGF level showed significant correlations with both global and multiple domains cognitions. Specifically, NGF mediated the association between APOE ε4 and Animal Fluency Test score (β, -0.45; 95% CI [-0.96, -0.07]; p < 0.001) and Trail Making Test-A (time) (β, 0.15; 95% CI [0.01, 0.33]; p < 0.001). CONCLUSION APOE ε4 is associated with cognitive impairment, and those carrying APOE ε4 have decreased NGF level in CSF. Declined NGF level is correlated with compromised cognition. NGF mediates APOE ε4-associated cognitive impairment.
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Affiliation(s)
- Mingyue He
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Zhan Liu
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Tenghong Lian
- Center for Cognitive Neurology, Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Peng Guo
- Center for Cognitive Neurology, Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Wenjing Zhang
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Yue Huang
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
- China National Clinical Research Center for Neurological DiseasesBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
- Department of Pharmacology, School of Medical Sciences, Faculty of Medicine & HealthUNSW SydneySydneyNew South WalesAustralia
| | - Yanan Zhang
- Department of Blood TransfusionBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Gaifen Liu
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
- China National Clinical Research Center for Neurological DiseasesBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Weijiao Zhang
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Jinghui Li
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Huiying Guan
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Weijia Zhang
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Dongmei Luo
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Jing Qi
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Hao Yue
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
| | - Xiaomin Wang
- Department of PhysiologyCapital Medical UniversityBeijingChina
| | - Wei Zhang
- Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
- Center for Cognitive Neurology, Department of NeurologyBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
- China National Clinical Research Center for Neurological DiseasesBeijing Tiantan Hospital, Capital Medical UniversityBeijingChina
- Center of Parkinson's DiseaseBeijing Institute for Brain DisordersBeijingChina
- Beijing Key Laboratory on Parkinson DiseaseBeijingChina
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Kim MY, Kim S, Lee J, Kim JI, Oh E, Kim SW, Lee E, Cho KS, Kim CS, Lee MH. Lignan-Rich Sesame ( Sesamum indicum L.) Cultivar Exhibits In Vitro Anti-Cholinesterase Activity, Anti-Neurotoxicity in Amyloid-β Induced SH-SY5Y Cells, and Produces an In Vivo Nootropic Effect in Scopolamine-Induced Memory Impaired Mice. Antioxidants (Basel) 2023; 12:antiox12051110. [PMID: 37237976 DOI: 10.3390/antiox12051110] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/28/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
Alzheimer's disease, a major cause of dementia, is characterized by impaired cholinergic function, increased oxidative stress, and amyloid cascade induction. Sesame lignans have attracted considerable attention owing to their beneficial effects on brain health. This study investigated the neuroprotective potential of lignan-rich sesame cultivars. Among the 10 sesame varieties studied, Milyang 74 (M74) extracts exhibited the highest total lignan content (17.71 mg/g) and in vitro acetylcholinesterase (AChE) inhibitory activity (66.17%, 0.4 mg/mL). M74 extracts were the most effective in improving cell viability and inhibiting reactive oxygen species (ROS) and malondialdehyde (MDA) generation in amyloid-β25-35 fragment-treated SH-SY5Y cells. Thus, M74 was used to evaluate the nootropic effects of sesame extracts and oil on scopolamine (2 mg/kg)-induced memory impairment in mice compared to the control cultivar (Goenback). Pretreatment with the M74 extract (250 and 500 mg/kg) and oil (1 and 2 mL/kg) effectively improved memory disorder in mice (demonstrated by the passive avoidance test), inhibited AChE, and enhanced acetylcholine (Ach) levels. Moreover, immunohistochemistry and Western blot results showed that the M74 extract and oil reversed the scopolamine-induced increase in APP, BACE-1, and presenilin expression levels in the amyloid cascade and decreased BDNF and NGF expression levels in neuronal regeneration.
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Affiliation(s)
- Min-Young Kim
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Sungup Kim
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Jeongeun Lee
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Jung-In Kim
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Eunyoung Oh
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Sang-Woo Kim
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Eunsoo Lee
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Kwang-Soo Cho
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Choon-Song Kim
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
| | - Myoung-Hee Lee
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Milyang 50424, Republic of Korea
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Chen X, He E, Su C, Zeng Y, Xu J. Huntingtin-associated protein 1-associated intracellular trafficking in neurodegenerative diseases. Front Aging Neurosci 2023; 15:1100395. [PMID: 36824265 PMCID: PMC9941194 DOI: 10.3389/fnagi.2023.1100395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/18/2023] [Indexed: 02/10/2023] Open
Abstract
Huntingtin-associated protein 1 (HAP1), the first identified HTT-binding partner, is highly expressed in the central nervous system, and has been found to associated with neurological diseases. Mounting evidence suggests that HAP1 functions as a component of cargo-motor molecules to bind various proteins and participates in intracellular trafficking. It is known that the failure of intracellular transport is a key contributor to the progression of neurodegenerative disorders (NDs) including Alzheimer's disease (AD), Huntington's disease (HD), Parkinson's disease (PD), amyotrophic lateral sclerosis (ALS), spinal and bulbar muscular atrophy (SBMA) and spinocerebellar ataxia (SCA). The link between HAP1 and various NDs is supported by growing evidence. This review aims to provide a comprehensive overview of the intracellular trafficking function of HAP1 and its involvement in NDs.
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Affiliation(s)
- Xingxing Chen
- Brain Science and Advanced Technology Institute, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, Hubei, China,Geriatric Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, Hubei, China,*Correspondence: Xingxing Chen, ✉
| | - Enhao He
- Brain Science and Advanced Technology Institute, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, Hubei, China
| | - Chonglin Su
- Brain Science and Advanced Technology Institute, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, Hubei, China
| | - Yan Zeng
- Brain Science and Advanced Technology Institute, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, Hubei, China,Geriatric Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, Hubei, China
| | - Jiang Xu
- Hubei Key Laboratory of Nerve Injury and Functional Reconstruction, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China,Jiang Xu, ✉
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Amyloidogenesis and Neurotrophic Dysfunction in Alzheimer’s Disease: Do They have a Common Regulating Pathway? Cells 2022; 11:cells11203201. [PMID: 36291068 PMCID: PMC9600014 DOI: 10.3390/cells11203201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/07/2022] [Accepted: 10/09/2022] [Indexed: 11/17/2022] Open
Abstract
The amyloid cascade hypothesis has predominately been used to describe the pathogenesis of Alzheimer’s disease (AD) for decades, as Aβ oligomers are thought to be the prime cause of AD. Meanwhile, the neurotrophic factor hypothesis has also been proposed for decades. Accumulating evidence states that the amyloidogenic process and neurotrophic dysfunction are mutually influenced and may coincidently cause the onset and progress of AD. Meanwhile, there are intracellular regulators participating both in the amyloidogenic process and neurotrophic pathways, which might be the common original causes of amyloidogenesis and neurotrophic dysfunction. In this review, the current understanding regarding the role of neurotrophic dysfunction and the amyloidogenic process in AD pathology is briefly summarized. The mutual influence of these two pathogenesis pathways and their potential common causal pathway are further discussed. Therapeutic strategies targeting the common pathways to simultaneously prevent amyloidogenesis and neurotrophic dysfunction might be anticipated for the disease-modifying treatment of AD.
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Som S, Antony J, Dhanabal SP, Ponnusankar S. Neuroprotective role of Diosgenin, a NGF stimulator, against Aβ (1-42) induced neurotoxicity in animal model of Alzheimer's disease. Metab Brain Dis 2022; 37:359-372. [PMID: 35023028 DOI: 10.1007/s11011-021-00880-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 12/05/2021] [Indexed: 01/24/2023]
Abstract
Diosgenin is a neurosteroid derived from the plants and has been previously reported for its numerous health beneficial properties, such as anti-arrhythmic, hypolipidemic, and antiproliferative effects. Although several studies conducted earlier suggested cognition enhancement actions of diosgenin against neurodegenerative disorders, but the molecular mechanisms underlying are not clearly understood. In the present study, we investigated the neuroprotective effect of diosgenin in the Wistar rats that received an intracerebroventricular injection of Amyloid-β (1-42) peptides, representing a rodent model of Alzheimer's disease (AD). Animals were treated with 100 and 200 mg/kg/p.o of diosgenin for 28 days, followed by Amyloid-β (1-42) peptides infusion. Animals were assessed for the spatial learning and memory by using radial arm maze and passive avoidance task. Subsequently, animals were euthanized and brains were collected for biochemical estimations and histopathological studies. Our results revealed that, diosgenin administration dose dependently improved the spatial learning and memory and protected the animals from Amyloid-β (1-42) peptides induced disrupted cognitive functions. Further, biochemical analysis showed that diosgenin successfully attenuated Amyloid-β (1-42) mediated plaque load, oxidative stress, neuroinflammation and elevated acetylcholinesterase activity. In addition, histopathological evaluation also supported neuroprotective effects of diosgenin in hippocampus of rat brain when assessed using hematoxylin-eosin and Cresyl Violet staining. Thus, the aforementioned effects suggested protective action of diosgenin against Aβ (1-42) induced neuronal damage and thereby can serve as a potential therapeutic candidate for AD.
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Affiliation(s)
- Swati Som
- Department of Pharmacy Practice, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty-643001, Tamilnadu, India
| | - Justin Antony
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty-643001, Tamilnadu, India
| | - SPalanisamy Dhanabal
- Department of Pharmacognosy and Phytochemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty-643001, Tamilnadu, India
| | - Sivasankaran Ponnusankar
- Department of Pharmacy Practice, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty-643001, Tamilnadu, India.
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Aghajanov M, Matinyan S, Chavushyan V, Danielyan M, Karapetyan G, Mirumyan M, Fereshetyan K, Harutyunyan H, Yenkoyan K. The Involvement of Insulin-Like Growth Factor 1 and Nerve Growth Factor in Alzheimer's Disease-Like Pathology and Survival Role of the Mix of Embryonic Proteoglycans: Electrophysiological Fingerprint, Structural Changes and Regulatory Effects on Neurotrophins. Int J Mol Sci 2021; 22:ijms22137084. [PMID: 34209299 PMCID: PMC8267974 DOI: 10.3390/ijms22137084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/17/2021] [Accepted: 06/28/2021] [Indexed: 12/31/2022] Open
Abstract
Alzheimer’s disease (AD)-associated neurodegeneration is triggered by different fragments of amyloid beta (Aβ). Among them, Aβ (25–35) fragment plays a critical role in the development of neurodegeneration—it reduces synaptic integrity by disruption of excitatory/inhibitory ratio across networks and alters the growth factors synthesis. Thus, in this study, we aimed to identify the involvement of neurotrophic factors—the insulin-like growth factor 1 (IGF-1) and nerve growth factor (NGF)—of AD-like neurodegeneration induced by Aβ (25–35). Taking into account our previous findings on the neuroprotective effects of the mix of proteoglycans of embryonic genesis (PEG), it was suggested to test its regulatory effect on IGF-1 and NGF levels. To evaluate the progress of neurodegeneration, in vivo electrophysiological investigation of synaptic activity disruption of the entorhinal cortex–hippocampus circuit at AD was performed and the potential recovery effects of PEG with relative structural changes were provided. To reveal the direct effects of PEG on brain functional activity, the electrophysiological pattern of the single cells from nucleus supraopticus, sensomotor cortex and hippocampus after acute injection of PEG was examined. Our results demonstrated that after i.c.v. injection of Aβ (25–35), the level of NGF decreased in cerebral cortex and hypothalamus, and, in contrast, increased in hippocampus, prompting its multidirectional role in case of brain damage. The concentration of IGF-1 significantly increased in all investigated brain structures. The administration of PEG balanced the growth factor levels accompanied by substantial restoration of neural tissue architecture and synaptic activity. Acute injection of PEG activated the hypothalamic nucleus supraopticus and hippocampal neurons. IGF-1 and NGF levels were found to be elevated in animals receiving PEG in an absence of amyloid exposure. We suggest that IGF-1 and NGF play a critical role in the development of AD. At the same time, it becomes clear that the neuroprotective effects of PEG are likely mediated via the regulation of neurotrophins.
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Affiliation(s)
- Michail Aghajanov
- Department of Biochemistry, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (M.A.); (S.M.); (M.M.); (K.F.)
| | - Senik Matinyan
- Department of Biochemistry, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (M.A.); (S.M.); (M.M.); (K.F.)
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
| | - Vergine Chavushyan
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
- Laboratory of Neuroendocrine Relations, L. Orbeli Institute of Physiology of NAS, Yerevan 0028, Armenia
| | - Margarita Danielyan
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
- Laboratory of Histochemistry and Electromicroscopy, L. Orbeli Institute of Physiology of NAS, Yerevan 0028, Armenia
| | - Gohar Karapetyan
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
| | - Margarita Mirumyan
- Department of Biochemistry, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (M.A.); (S.M.); (M.M.); (K.F.)
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
| | - Katarine Fereshetyan
- Department of Biochemistry, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (M.A.); (S.M.); (M.M.); (K.F.)
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
| | - Hayk Harutyunyan
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
| | - Konstantin Yenkoyan
- Department of Biochemistry, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (M.A.); (S.M.); (M.M.); (K.F.)
- Laboratory of Neuroscience, Yerevan State Medical University after M. Heratsi, Yerevan 0025, Armenia; (V.C.); (M.D.); (G.K.); (H.H.)
- Correspondence: or
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Triaca V, Ruberti F, Canu N. NGF and the Amyloid Precursor Protein in Alzheimer's Disease: From Molecular Players to Neuronal Circuits. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1331:145-165. [PMID: 34453297 DOI: 10.1007/978-3-030-74046-7_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Alzheimer's disease (AD), one of the most common causes of dementia in elderly people, is characterized by progressive impairment in cognitive function, early degeneration of basal forebrain cholinergic neurons (BFCNs), abnormal metabolism of the amyloid precursor protein (APP), amyloid beta-peptide (Aβ) depositions, and neurofibrillary tangles. According to the cholinergic hypothesis, dysfunction of acetylcholine-containing neurons in the basal forebrain contributes markedly to the cognitive decline observed in AD. In addition, the neurotrophic factor hypothesis posits that the loss nerve growth factor (NGF) signalling in AD may account for the vulnerability to atrophy of BFCNs and consequent impairment of cholinergic functions. Though acetylcholinesterase inhibitors provide only partial and symptomatic relief to AD patients, emerging data from in vivo magnetic resonance imaging (MRI) and positron emission tomography (PET) studies in mild cognitive impairment (MCI) and AD patients highlight the early involvement of BFCNs in MCI and the early phase of AD. These data support the cholinergic and neurotrophic hypotheses of AD and suggest new targets for AD therapy.Different mechanisms account for selective vulnerability of BFCNs to AD pathology, with regard to altered metabolism of APP and tau. In this review, we provide a general overview of the current knowledge of NGF and APP interplay, focusing on the role of APP in regulating NGF receptors trafficking/signalling and on the involvement of NGF in modulating phosphorylation of APP, which in turn controls APP intracellular trafficking and processing. Moreover, we highlight the consequences of APP interaction with p75NTR and TrkA receptor, which share the same binding site within the APP juxta-membrane domain. We underline the importance of insulin dysmetabolism in AD pathology, in the light of our recent data showing that overlapping intracellular signalling pathways stimulated by NGF or insulin can be compensatory. In particular, NGF-based signalling is able to ameliorates deficiencies in insulin signalling in the medial septum of 3×Tg-AD mice. Finally, we present an overview of NGF-regulated microRNAs (miRNAs). These small non-coding RNAs are involved in post-transcriptional regulation of gene expression , and we focus on a subset that are specifically deregulated in AD and thus potentially contribute to its pathology.
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Affiliation(s)
- Viviana Triaca
- Institute of Biochemistry and Cell Biology (IBBC), National Research Council (CNR), Campus A. Buzzati-Traverso, Monterotondo, RM, Italy
| | - Francesca Ruberti
- Institute of Biochemistry and Cell Biology (IBBC), National Research Council (CNR), Campus A. Buzzati-Traverso, Monterotondo, RM, Italy
| | - Nadia Canu
- Institute of Biochemistry and Cell Biology (IBBC), National Research Council (CNR), Campus A. Buzzati-Traverso, Monterotondo, RM, Italy. .,Department of System Medicine, Section of Physiology, University of Rome "Tor Vergata", Rome, Italy.
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10
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Validation of a priori candidate Alzheimer's disease SNPs with brain amyloid-beta deposition. Sci Rep 2019; 9:17069. [PMID: 31745181 PMCID: PMC6863876 DOI: 10.1038/s41598-019-53604-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 11/04/2019] [Indexed: 12/14/2022] Open
Abstract
The accumulation of brain amyloid β (Aβ) is one of the main pathological hallmarks of Alzheimer’s disease (AD). However, the role of brain amyloid deposition in the development of AD and the genetic variants associated with this process remain unclear. In this study, we sought to identify associations between Aβ deposition and an a priori evidence based set of 1610 genetic markers, genotyped from 505 unrelated individuals (258 Aβ+ and 247 Aβ−) enrolled in the Australian Imaging, Biomarker & Lifestyle (AIBL) study. We found statistically significant associations for 6 markers located within intronic regions of 6 genes, including AC103796.1-BDNF, PPP3R1, NGFR, KL, ABCA7 & CALHM1. Although functional studies are required to elucidate the role of these genes in the accumulation of Aβ and their potential implication in AD pathophysiology, our findings are consistent with results obtained in previous GWAS efforts.
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11
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Su R, Su W, Jiao Q. NGF protects neuroblastoma cells against β-amyloid-induced apoptosis via the Nrf2/HO-1 pathway. FEBS Open Bio 2019; 9:2063-2071. [PMID: 31605506 PMCID: PMC6886293 DOI: 10.1002/2211-5463.12742] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 08/21/2019] [Accepted: 10/09/2019] [Indexed: 01/18/2023] Open
Abstract
As one of the main neurotrophic factors, nerve growth factor (NGF) participates in various processes related to viability, plasticity, and neuronal growth. NGF is known to protect against cell death and toxicity triggered by β‐amyloid (Aβ), but the underlying mechanism remains unclear. Here, we investigated this process in SKNSH neuroblastoma, in which NGF reduced cell death induced by Aβ25–35. Furthermore, NGF suppressed the production of reactive oxygen species (ROS) and promoted antioxidant function via Aβ25–35. Additionally, we demonstrated that NGF impaired the activation of the JNK/c‐Jun signaling pathway and significantly increased Nrf2 nuclear translocation and HO‐1 expression. Nrf2 elimination abolished the protective effect of NGF‐1 on Aβ25–35‐induced ROS generation, apoptosis, and activation of the JNK/c‐Jun pathway. The results of our study indicate that NGF protects neuroblastoma against injury triggered by Aβ25–35 via suppression of ROS–JNK/c‐Jun pathway stimulation through the Nrf2/HO‐1 pathway. Nerve growth factor (NGF) promotes the nuclear translocation of Nrf2 and subsequently upregulates HO‐1 expression. This reduces the levels of reactive oxygen species (ROS), which attenuates the activation of JNK/c‐Jun pathway and eventually contributes to deceased cell apoptosis. The present discovery of this novel NGF/Nrf2/HO‐1 pathway and ROS–JNK/c‐Jun pathway identifies new clinical targets for therapeutic intervention of Alzheimer's disease.![]()
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Affiliation(s)
- Rui Su
- Department of Neurosurgery, Luoyang Central Hospital Affiliated to Zhengzhou University, China
| | - Wei Su
- Department of Intensive Care Unit, Sir Run Run Shaw Hospital Affiliated by Zhejiang University School of Medicine, Hangzhou, China
| | - Qian Jiao
- Department of Anesthesia Surgery, Sanmenxia Central Hospital, China
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12
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Expression of AHI1 Rescues Amyloidogenic Pathology in Alzheimer's Disease Model Cells. Mol Neurobiol 2019; 56:7572-7582. [PMID: 31062249 DOI: 10.1007/s12035-019-1587-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 03/27/2019] [Indexed: 01/03/2023]
Abstract
A hallmark of Alzheimer's disease (AD) pathogenesis is the accumulation of extracellular plaques mainly composed of amyloid-β (Aβ) derived from amyloid precursor protein (APP) cleavage. Recent reports suggest that transport of APP in vesicles with huntingtin-associated protein-1 (HAP1) negatively regulates Aβ production. In neurons, HAP1 forms a stable complex with Abelson helper integration site-1 (AHI1), in which mutations cause neurodevelopmental and psychiatric disorders. HAP1 and AHI1 interact with tropomyosin receptor kinases (Trks), which are also associated with APP and mediate neurotrophic signaling. In this study, we hypothesize that AHI1 participates in APP trafficking and processing to rescue AD pathology. Indeed, AHI1 was significantly reduced in mouse neuroblastoma N2a cells expressing human Swedish and Indiana APP (designed as AD model cells) and in 3xTg-AD mouse brain. The AD model cells as well as Ahi1-knockdown cells expressing wild-type APP-695 exhibited a significant reduction in viability. In addition, the AD model cells were reduced in neurite outgrowth. APP C-terminal fragment-β (CTFβ) and Aβ42 were increased in the AD cell lysates and the culture media, respectively. To investigate the mechanism how AHI1 alters APP activities, we overexpressed human AHI1 in the AD model cells. The results showed that AHI1 interacted with APP physically in mouse brain and transfected N2a cells despite APP genotypes. AHI1 expression facilitated intracellular translocation of APP and inhibited APP amyloidogenic process to reduce the level of APP-CTFβ in the total lysates of AD model cells as well as Aβ in the culture media. Consequently, AHI1-APP interactions enhanced neurotrophic signaling through Erk activation and led to restored cell survival and differentiation.
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13
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Mitra S, Behbahani H, Eriksdotter M. Innovative Therapy for Alzheimer's Disease-With Focus on Biodelivery of NGF. Front Neurosci 2019; 13:38. [PMID: 30804738 PMCID: PMC6370742 DOI: 10.3389/fnins.2019.00038] [Citation(s) in RCA: 101] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 01/15/2019] [Indexed: 12/31/2022] Open
Abstract
Alzheimer’s disease (AD) is a progressive neurodegenerative disorder associated with abnormal protein modification, inflammation and memory impairment. Aggregated amyloid beta (Aβ) and phosphorylated tau proteins are medical diagnostic features. Loss of memory in AD has been associated with central cholinergic dysfunction in basal forebrain, from where the cholinergic circuitry projects to cerebral cortex and hippocampus. Various reports link AD progression with declining activity of cholinergic neurons in basal forebrain. The neurotrophic molecule, nerve growth factor (NGF), plays a major role in the maintenance of cholinergic neurons integrity and function, both during development and adulthood. Numerous studies have also shown that NGF contributes to the survival and regeneration of neurons during aging and in age-related diseases such as AD. Changes in neurotrophic signaling pathways are involved in the aging process and contribute to cholinergic and cognitive decline as observed in AD. Further, gradual dysregulation of neurotrophic factors like NGF and brain derived neurotrophic factor (BDNF) have been reported during AD development thus intensifying further research in targeting these factors as disease modifying therapies against AD. Today, there is no cure available for AD and the effects of the symptomatic treatment like cholinesterase inhibitors (ChEIs) and memantine are transient and moderate. Although many AD treatment studies are being carried out, there has not been any breakthrough and new therapies are thus highly needed. Long-term effective therapy for alleviating cognitive impairment is a major unmet need. Discussion and summarizing the new advancements of using NGF as a potential therapeutic implication in AD are important. In summary, the intent of this review is describing available experimental and clinical data related to AD therapy, priming to gain additional facts associated with the importance of NGF for AD treatment, and encapsulated cell biodelivery (ECB) as an efficient tool for NGF delivery.
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Affiliation(s)
- Sumonto Mitra
- Division of Clinical Geriatrics, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Huddinge, Sweden
| | - Homira Behbahani
- Division of Neurogeriatrics, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Solna, Sweden
| | - Maria Eriksdotter
- Division of Clinical Geriatrics, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Huddinge, Sweden.,Aging Theme, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
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14
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Tsai YF, Yang DJ, Ngo TH, Shih CH, Wu YF, Lee CK, Phraekanjanavichid V, Yen SF, Kao SH, Lee HM, Huang VS, Shieh JCC, Lin YF. Ganglioside Hp-s1 Analogue Inhibits Amyloidogenic Toxicity in Alzheimer's Disease Model Cells. ACS Chem Neurosci 2019; 10:528-536. [PMID: 30346715 DOI: 10.1021/acschemneuro.8b00406] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Alzheimer's disease (AD) is characterized by extracellular deposition of amyloid plaques, which are predominantly composed of amyloid-β (Aβ) peptide derived from amyloid precursor protein (APP) cleavage. APP interacts with tropomyosin receptor kinase A, a neurotrophic receptor associated with gangliosides and mediating neuronal survival and differentiation through the extracellular signal-regulated protein kinase (ERK) pathway. The ganglioside Hp-s1's analogue Hp-s1A exerts neuritogenic activity; however, its effect on AD pathology remains unknown. To test the hypothesis that Hp-s1A is a potential candidate to treat AD, we established the AD-modeled cell line by expressing human Swedish and Indiana APP gene (APP-Swe/Ind) in N2a mouse neuroblastoma cells. The cells were treated with Hp-s1A or monosialoganglioside GM1 for comparison. The AD model cells expressing APP-Swe/Ind exhibited a significant reduction in viability, as well as neurite outgrowth rate, in comparison to the control cells expressing APP-695. APP C-terminal fragment-β (CTFβ) and Aβ42 were increased in the AD cell lysates and the culture media, respectively. With the treatment of either Hp-s1A or GM1 at 1 μM, the AD model cells showed a significant increase in viability; however, only Hp-s1A reduced CTFβ levels in these cells. Further analysis of the culture media revealed that Hp-s1A also reduced Aβ42 production from AD model cells. The phosphorylation of ERK was elevated and the neurite outgrowth rate was restored with Hp-s1A treatment. In conclusion, the ganglioside analogue Hp-s1A inhibited amyloidogenic processing of APP and promoted neurotrophic activity and survival of AD model cells. Hp-s1A has great potential in AD therapeutic development.
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Affiliation(s)
- Yow-Fu Tsai
- Department of Chemistry, College of Science, Chung Yuan Christian University, Taoyuan 320, Taiwan
| | - Dun-Jhu Yang
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
| | - Thi Huong Ngo
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
- Department of Allergology and Clinical Immunology, Hanoi Medical University, Hanoi, Vietnam
| | - Cheng-Hua Shih
- Department of Chemistry, College of Science, Chung Yuan Christian University, Taoyuan 320, Taiwan
| | - Yu-Fa Wu
- Department of Chemistry, College of Science, Chung Yuan Christian University, Taoyuan 320, Taiwan
| | - Ching-Kuo Lee
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110, Taiwan
| | - Veerapol Phraekanjanavichid
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
| | - Shu-Fen Yen
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
- Department of Laboratory Medicine, Taipei Medical University Hospital, Taipei 110, Taiwan
| | - Shu-Huei Kao
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
- Ph.D. Program in Medical Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
| | - Horng-Mo Lee
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
- Ph.D. Program in Medical Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
| | - Vivian Shuhsien Huang
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
- Department of Pharmaceutical Sciences, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts 02115, United States
| | - Jonathan Chang-Cheng Shieh
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
| | - Yung-Feng Lin
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
- Ph.D. Program in Medical Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan
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15
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Luu L, Ciccotosto GD, Vella LJ, Cheng L, Roisman LC, Multhaup G, Hill AF, Munter LM, Cappai R. Amyloid Precursor Protein Dimerisation Reduces Neurite Outgrowth. Mol Neurobiol 2018; 56:13-28. [PMID: 29675574 DOI: 10.1007/s12035-018-1070-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 04/09/2018] [Indexed: 02/08/2023]
Abstract
The amyloid precursor protein (APP) undergoes extensive metabolism, and its transport and proteolytic processing can be modulated by its ability to form a homodimer. We have investigated the functional consequences of stabilised APP dimer expression in cells by studying the engineered dimerisation of the APPL17C (residue 17 in Aβ sequence) construct, which is associated with a 30% increase in APP dimer expression, on APP's neurite outgrowth promoting activity. Overexpression of APPL17C in SH-SY5Y cells decreased neurite outgrowth upon retinoic acid differentiation as compared to overexpressing APPWT cells. The APPL17C phenotype was rescued by replacing the APPL17C media with conditioned media from APPWT cells, indicating that the APPL17C mutant is impairing the secretion of a neuritogenic promoting factor. APPL17C had altered transport and was localised in the endoplasmic reticulum. Defining the molecular basis of the APPL17C phenotype showed that RhoA GTPase activity, a negative regulator of neurite outgrowth, was increased in APPL17C cells. RhoA activity was decreased after APPWT conditioned media rescue. Moreover, treatment with the RhoA inhibitor, Y27632, restored a wild-type morphology to the APPL17C cells. Small RNAseq analysis of APPL17C and APPWT cells identified several differentially expressed miRNAs relating to neurite outgrowth. Of these, miR-34a showed the greatest decrease in expression. Lentiviral-mediated overexpression of miR-34a rescued neurite outgrowth in APPL17C cells to APPWT levels and changed RhoA activation. This study has identified a novel link between APP dimerisation and its neuritogenic activity which is mediated by miR-34a expression.
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Affiliation(s)
- Luan Luu
- Department of Pathology, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Giuseppe D Ciccotosto
- Department of Pathology, The University of Melbourne, Melbourne, VIC, 3010, Australia.,Department of Pharmacology & Therapeutics, The University of Melbourne, Melbourne, VIC, 3010, Australia.,Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Laura J Vella
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Lesley Cheng
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Laila C Roisman
- Department of Pathology, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Gerhard Multhaup
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, H3G 1Y6, Canada
| | - Andrew F Hill
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Lisa-Marie Munter
- Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, H3G 1Y6, Canada
| | - Roberto Cappai
- Department of Pathology, The University of Melbourne, Melbourne, VIC, 3010, Australia. .,Department of Pharmacology & Therapeutics, The University of Melbourne, Melbourne, VIC, 3010, Australia.
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16
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Long X, Li M, Li LX, Sun YY, Zhang WX, Zhao DY, Li YQ. Butyrate promotes visceral hypersensitivity in an IBS-like model via enteric glial cell-derived nerve growth factor. Neurogastroenterol Motil 2018; 30:e13227. [PMID: 29052293 DOI: 10.1111/nmo.13227] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 09/14/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND Altered visceral sensation is common in irritable bowel syndrome (IBS) and nerve growth factor (NGF) participates in visceral pain development. Sodium butyrate (NaB) could induce colonic hypersensitivity via peripheral up-regulation of NGF in animals. Enteric glial cells (EGCs) appear to be an important source of NGF. Whether butyrate could induce visceral hypersensitivity via increased EGC-derived NGF is still unknown. METHODS CRL-2690 cells were used for transcriptome analyses after butyrate treatment. Rats received butyrate enemas to induce colonic hypersensitivity. Colorectal distention test was performed to assess visceral sensitivity. Immunofluorescence studies were used to evaluate the co-expression of glial fibrillary acidic protein (GFAP) and NGF or growth associated protein 43 in animal model. NGF expression in rat colon was also investigated. In vitro, CRL-2690 cells were stimulated with NaB or trichostatin A (TSA). NGF or GFAP expression was also examined. KEY RESULTS Transcriptome analyses showed that butyrate induced marked changes of genes expression related to neurotrophic signaling pathways. NaB-treated rats showed increased visceral sensitivity. An improved NGF expression level was observed in NaB-treated rats. Meanwhile, a 2.1-fold increase in co-expression of GFAP and NGF was also determined in rats received NaB enemas. In cultured cells, both NaB and TSA treatment could cause obvious NGF expression. Thus, butyrate might regulate EGC function via histone deacetylase inhibition. CONCLUSIONS & INFERENCES Butyrate-EGC interplay may play a pivotal role in regulation of NGF expression and the development of colonic hypersensitivity in IBS-like animal model.
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Affiliation(s)
- X Long
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
| | - M Li
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
| | - L-X Li
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
| | - Y-Y Sun
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
| | - W-X Zhang
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
| | - D-Y Zhao
- Department of Gastroenterology, General Hospital of Puyang Oilfield, Puyang, China
| | - Y-Q Li
- Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
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17
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Colacurcio DJ, Pensalfini A, Jiang Y, Nixon RA. Dysfunction of autophagy and endosomal-lysosomal pathways: Roles in pathogenesis of Down syndrome and Alzheimer's Disease. Free Radic Biol Med 2018; 114:40-51. [PMID: 28988799 PMCID: PMC5748263 DOI: 10.1016/j.freeradbiomed.2017.10.001] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/03/2017] [Accepted: 10/04/2017] [Indexed: 12/12/2022]
Abstract
Individuals with Down syndrome (DS) have an increased risk of early-onset Alzheimer's Disease (AD), largely owing to a triplication of the APP gene, located on chromosome 21. In DS and AD, defects in endocytosis and lysosomal function appear at the earliest stages of disease development and progress to widespread failure of intraneuronal waste clearance, neuritic dystrophy and neuronal cell death. The same genetic factors that cause or increase AD risk are also direct causes of endosomal-lysosomal dysfunction, underscoring the essential partnership between this dysfunction and APP metabolites in AD pathogenesis. The appearance of APP-dependent endosome anomalies in DS beginning in infancy and evolving into the full range of AD-related endosomal-lysosomal deficits provides a unique opportunity to characterize the earliest pathobiology of AD preceding the classical neuropathological hallmarks. Facilitating this characterization is the authentic recapitulation of this endosomal pathobiology in peripheral cells from people with DS and in trisomy mouse models. Here, we review current research on endocytic-lysosomal dysfunction in DS and AD, the emerging importance of APP/βCTF in initiating this dysfunction, and the potential roles of additional trisomy 21 genes in accelerating endosomal-lysosomal impairment in DS. Collectively, these studies underscore the growing value of investigating DS to probe the biological origins of AD as well as to understand and ameliorate the developmental disability of DS.
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Affiliation(s)
- Daniel J Colacurcio
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY 10962, USA; Department of Psychiatry, New York University Langone Medical Center, New York, NY 10016, USA
| | - Anna Pensalfini
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY 10962, USA; Department of Psychiatry, New York University Langone Medical Center, New York, NY 10016, USA
| | - Ying Jiang
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY 10962, USA; Department of Psychiatry, New York University Langone Medical Center, New York, NY 10016, USA
| | - Ralph A Nixon
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY 10962, USA; Department of Psychiatry, New York University Langone Medical Center, New York, NY 10016, USA; Department of Cell Biology, New York University Langone Medical Center, New York, NY 10016, USA.
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18
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Canu N, Amadoro G, Triaca V, Latina V, Sposato V, Corsetti V, Severini C, Ciotti MT, Calissano P. The Intersection of NGF/TrkA Signaling and Amyloid Precursor Protein Processing in Alzheimer's Disease Neuropathology. Int J Mol Sci 2017. [PMID: 28632177 PMCID: PMC5486140 DOI: 10.3390/ijms18061319] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Dysfunction of nerve growth factor (NGF) and its high-affinity Tropomyosin receptor kinase A (TrkA) receptor has been suggested to contribute to the selective degeneration of basal forebrain cholinergic neurons (BFCN) associated with the progressive cognitive decline in Alzheimer's disease (AD). The aim of this review is to describe our progress in elucidating the molecular mechanisms underlying the dynamic interplay between NGF/TrkA signaling and amyloid precursor protein (APP) metabolism within the context of AD neuropathology. This is mainly based on the finding that TrkA receptor binding to APP depends on a minimal stretch of ~20 amino acids located in the juxtamembrane/extracellular domain of APP that carries the α- and β-secretase cleavage sites. Here, we provide evidence that: (i) NGF could be one of the “routing” proteins responsible for modulating the metabolism of APP from amyloidogenic towards non-amyloidogenic processing via binding to the TrkA receptor; (ii) the loss of NGF/TrkA signaling could be linked to sporadic AD contributing to the classical hallmarks of the neuropathology, such as synaptic loss, β-amyloid peptide (Aβ) deposition and tau abnormalities. These findings will hopefully help to design therapeutic strategies for AD treatment aimed at preserving cholinergic function and anti-amyloidogenic activity of the physiological NGF/TrkA pathway in the septo-hippocampal system.
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Affiliation(s)
- Nadia Canu
- Department of System Medicine, University of Rome "Tor Vergata", Via Montpellier 1, 00137 Rome, Italy.
- Institute of Cellular Biology and Neurobiology, National Council of Research Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
| | - Giuseppina Amadoro
- Institute of Translational Pharmacology, National Research Council (CNR) Rome, Via Fosso del Cavaliere 100, 00133 Rome, Italy.
| | - Viviana Triaca
- Institute of Cellular Biology and Neurobiology, National Council of Research Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
| | - Valentina Latina
- Institute of Translational Pharmacology, National Research Council (CNR) Rome, Via Fosso del Cavaliere 100, 00133 Rome, Italy.
| | - Valentina Sposato
- European Brain Research Institute Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
| | - Veronica Corsetti
- European Brain Research Institute Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
| | - Cinzia Severini
- Institute of Cellular Biology and Neurobiology, National Council of Research Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
| | - Maria Teresa Ciotti
- Institute of Cellular Biology and Neurobiology, National Council of Research Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
| | - Pietro Calissano
- European Brain Research Institute Rome, Via del Fosso del Fiorano 64, 00143 Rome, Italy.
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19
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Feng M, Hu X, Li N, Hu F, Chang F, Xu HF, Liu YJ. Distinctive roles of Rac1 and Rab29 in LRRK2 mediated membrane trafficking and neurite outgrowth. J Biomed Res 2017; 32:145-156. [PMID: 29336357 PMCID: PMC5895569 DOI: 10.7555/jbr.31.20170039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Parkinson's disease (PD) associated leucine-rich repeat kinase 2 (LRRK2) mutants have shown pathogenic effects on variety of subcellular processes.Two small GTPases Rac1 and Rab29 have been indicated as possible downstream effectors participating in LRRK2 signaling but their detail mechanisms remain unclear. In this study, we have used biochemical and cell biology approaches to address whether two GTPases interact with LRRK2 and hence function differently in LRRK2 mediated pathogenesis.Here we show thatRac1 and Rab29 specifically interact with LRRK2with higher affinity for Rab29and with different preference in functional domain binding. Mutant Rab29 but not Rac1 alters theendosome-to-TGN retrograde trafficking of a cargo protein cation-independent mannose-6-phosphate receptor (CI-M6PR) and its stability. On the other hand, overexpressedwild type Rab29 but not Rac1 rescue the altered retrograde membrane trafficking induced by the pathogenic mutant LRRK2G2019S. Furthermore, both Rac1 and Rab29 can rescue the neurite shortening in differentiated SH-SY5Y cells induced by LRRK2G2019S. Our study strongly suggests that Rac1 and Rab29 are involved in the distinct functions as downstream effectors in LRRK2 signaling pathways.
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Affiliation(s)
- Min Feng
- Department of Physiology, Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Xin Hu
- Department of Physiology, Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Na Li
- Department of Physiology, Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Fan Hu
- Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Fei Chang
- Department of Physiology, Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Hong-Fei Xu
- Department of Physiology, Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Yong-Jian Liu
- Department of Physiology, Analyticaland Testing Center, School of Basic Medical Science, Nanjing Medical University, Nanjing, Jiangsu 211166, China
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20
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Canu N, Pagano I, La Rosa LR, Pellegrino M, Ciotti MT, Mercanti D, Moretti F, Sposato V, Triaca V, Petrella C, Maruyama IN, Levi A, Calissano P. Association of TrkA and APP Is Promoted by NGF and Reduced by Cell Death-Promoting Agents. Front Mol Neurosci 2017; 10:15. [PMID: 28197073 PMCID: PMC5281621 DOI: 10.3389/fnmol.2017.00015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 01/11/2017] [Indexed: 12/31/2022] Open
Abstract
The amyloid precursor protein (APP) interacts with the tropomyosin receptor kinase A (TrkA) in normal rat, mouse, and human brain tissue but not in Alzheimer's disease (AD) brain tissue. However, it has not been reported whether the two proteins interact directly, and if so, which domains are involved. Clarifying these points will increase our understanding of the role and regulation of the TrkA/APP interaction in normal brain functioning as well as in AD. Here we addressed these questions using bimolecular fluorescence complementation (BiFC) and the proximity ligation assay (PLA). We demonstrated that exogenously expressed APP and TrkA associate through their juxtamembrane/transmembrane domains, to form a complex that localizes mainly to the plasma membrane, endoplasmic reticulum (ER) and Golgi. Formation of the complex was inhibited by p75NTR, ShcC and Mint-2. Importantly, we demonstrated that the association between endogenous APP and TrkA in primary septal neurons were modified by NGF, or by drugs that either inhibit ER-to-Golgi transport or perturb microtubules and microfilaments. Interestingly, several agents that induce cell death [amyloid β (Aβ)-peptide, staurosporine and rapamycin], albeit via different mechanisms, all caused dissociation of APP/TrkA complexes and increased production of C-terminal fragment (β-CTF) APP fragment. These findings open new perspectives for investigating the interplay between these proteins during neurodegeneration and AD.
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Affiliation(s)
- Nadia Canu
- Department of System Medicine, University of Rome "Tor Vergata"Rome, Italy; Institute of Cellular Biology and Neurobiology, National Council of Research of RomeRome, Italy
| | - Ilaria Pagano
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Luca Rosario La Rosa
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Marsha Pellegrino
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Maria Teresa Ciotti
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Delio Mercanti
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Fabiola Moretti
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Valentina Sposato
- Institute of Cellular Biology and Neurobiology, National Council of Research of RomeRome, Italy; European Brain Research InstituteRome, Italy
| | - Viviana Triaca
- Institute of Cellular Biology and Neurobiology, National Council of Research of RomeRome, Italy; European Brain Research InstituteRome, Italy
| | - Carla Petrella
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Ichiro N Maruyama
- Information Processing Biology Unit, Okinawa Institute of Science and Technology Graduate University Okinawa, Japan
| | - Andrea Levi
- Institute of Cellular Biology and Neurobiology, National Council of Research of Rome Rome, Italy
| | - Pietro Calissano
- European Brain Research InstituteRome, Italy; Institute of Cellular Biology and Neurobiology, National Council of Research of RomeRome, Italy
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21
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Finding novel distinctions between the sAPPα-mediated anabolic biochemical pathways in Autism Spectrum Disorder and Fragile X Syndrome plasma and brain tissue. Sci Rep 2016; 6:26052. [PMID: 27212113 PMCID: PMC4876513 DOI: 10.1038/srep26052] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 04/25/2016] [Indexed: 02/07/2023] Open
Abstract
Autism spectrum disorder (ASD) and Fragile X syndrome (FXS) are developmental disorders. No validated blood-based biomarkers exist for either, which impedes bench-to-bedside approaches. Amyloid-β (Aβ) precursor protein (APP) and metabolites are usually associated with Alzheimer’s disease (AD). APP cleavage by α-secretase produces potentially neurotrophic secreted APPα (sAPPα) and the P3 peptide fragment. β-site APP cleaving enzyme (BACE1) cleavage produces secreted APPβ (sAPPβ) and intact Aβ. Excess Aβ is potentially neurotoxic and can lead to atrophy of brain regions such as amygdala in AD. By contrast, amygdala is enlarged in ASD but not FXS. We previously reported elevated levels of sAPPα in ASD and FXS vs. controls. We now report elevated plasma Aβ and total APP levels in FXS compared to both ASD and typically developing controls, and elevated levels of sAPPα in ASD and FXS vs. controls. By contrast, plasma and brain sAPPβ and Aβ were lower in ASD vs. controls but elevated in FXS plasma vs. controls. We also detected age-dependent increase in an α-secretase in ASD brains. We report a novel mechanistic difference in APP pathways between ASD (processing) and FXS (expression) leading to distinct APP metabolite profiles in these two disorders. These novel, distinctive biochemical differences between ASD and FXS pave the way for blood-based biomarkers for ASD and FXS.
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Xu W, Weissmiller AM, White JA, Fang F, Wang X, Wu Y, Pearn ML, Zhao X, Sawa M, Chen S, Gunawardena S, Ding J, Mobley WC, Wu C. Amyloid precursor protein-mediated endocytic pathway disruption induces axonal dysfunction and neurodegeneration. J Clin Invest 2016; 126:1815-33. [PMID: 27064279 PMCID: PMC4855914 DOI: 10.1172/jci82409] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 02/24/2016] [Indexed: 12/17/2022] Open
Abstract
The endosome/lysosome pathway is disrupted early in the course of both Alzheimer's disease (AD) and Down syndrome (DS); however, it is not clear how dysfunction in this pathway influences the development of these diseases. Herein, we explored the cellular and molecular mechanisms by which endosomal dysfunction contributes to the pathogenesis of AD and DS. We determined that full-length amyloid precursor protein (APP) and its β-C-terminal fragment (β-CTF) act though increased activation of Rab5 to cause enlargement of early endosomes and to disrupt retrograde axonal trafficking of nerve growth factor (NGF) signals. The functional impacts of APP and its various products were investigated in PC12 cells, cultured rat basal forebrain cholinergic neurons (BFCNs), and BFCNs from a mouse model of DS. We found that the full-length wild-type APP (APPWT) and β-CTF both induced endosomal enlargement and disrupted NGF signaling and axonal trafficking. β-CTF alone induced atrophy of BFCNs that was rescued by the dominant-negative Rab5 mutant, Rab5S34N. Moreover, expression of a dominant-negative Rab5 construct markedly reduced APP-induced axonal blockage in Drosophila. Therefore, increased APP and/or β-CTF impact the endocytic pathway to disrupt NGF trafficking and signaling, resulting in trophic deficits in BFCNs. Our data strongly support the emerging concept that dysregulation of Rab5 activity contributes importantly to early pathogenesis of AD and DS.
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Affiliation(s)
- Wei Xu
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Neurosciences, UCSD, La Jolla, California, USA
| | | | - Joseph A. White
- Department of Biological Sciences, The State University of New York at Buffalo, Buffalo, New York, USA
| | - Fang Fang
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Neurosciences, UCSD, La Jolla, California, USA
| | - Xinyi Wang
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yiwen Wu
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Matthew L. Pearn
- Department of Anesthesiology, UCSD, La Jolla, California, USA
- VA San Diego Healthcare System, San Diego, California, USA
| | - Xiaobei Zhao
- Department of Neurosciences, UCSD, La Jolla, California, USA
| | - Mariko Sawa
- Department of Neurosciences, UCSD, La Jolla, California, USA
| | - Shengdi Chen
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shermali Gunawardena
- Department of Biological Sciences, The State University of New York at Buffalo, Buffalo, New York, USA
| | - Jianqing Ding
- Department of Neurology and Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | | | - Chengbiao Wu
- Department of Neurosciences, UCSD, La Jolla, California, USA
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The Emerging Therapeutic Role of NGF in Alzheimer’s Disease. Neurochem Res 2016; 41:1211-8. [DOI: 10.1007/s11064-016-1829-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 12/08/2015] [Accepted: 01/05/2016] [Indexed: 11/29/2022]
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24
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Chen Q, Wang H, Liao S, Gao Y, Liao R, Little PJ, Xu J, Feng ZP, Zheng Y, Zheng W. Nerve growth factor protects retinal ganglion cells against injury induced by retinal ischemia-reperfusion in rats. Growth Factors 2015; 33:149-59. [PMID: 25707536 DOI: 10.3109/08977194.2015.1010642] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
In this study, we investigated the protective effect of mouse nerve growth factor (NGF) on retinal ganglion cell (RGC) injury induced by retinal ischemia-reperfusion (RIR) in rats and explored its possible mechanisms of action. RIR caused a significant injury to RGCs and an obvious impairment of the inner retina functions, which could be seen from flash electroretinogram and flash visual evoked potential recordings. RIR also increased the expression of the apoptotic protein Bax while decreasing the expression of Bcl-2 and the phosphorylation of protein kinase B (Akt) in RGCs. Preinjection (i.m.) of NGF for 22 d reversed the injury induced by RIR and ameliorated the inner retina functions. NGF also reduced the expression of Bax and reversed the reduction of Bcl-2 and the phosphorylated Akt induced by RIR. These results indicate that NGF produces a neuroprotective effect on RGCs against RIR injury and the protective effect of NGF is mainly mediated by the PI-3K/Akt signaling pathway.
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Affiliation(s)
- Qian Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University , Guangzhou , China
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25
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Weissmiller AM, Natera-Naranjo O, Reyna SM, Pearn ML, Zhao X, Nguyen P, Cheng S, Goldstein LSB, Tanzi RE, Wagner SL, Mobley WC, Wu C. A γ-secretase inhibitor, but not a γ-secretase modulator, induced defects in BDNF axonal trafficking and signaling: evidence for a role for APP. PLoS One 2015; 10:e0118379. [PMID: 25710492 PMCID: PMC4339551 DOI: 10.1371/journal.pone.0118379] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 01/14/2015] [Indexed: 11/19/2022] Open
Abstract
Clues to Alzheimer disease (AD) pathogenesis come from a variety of different sources including studies of clinical and neuropathological features, biomarkers, genomics and animal and cellular models. An important role for amyloid precursor protein (APP) and its processing has emerged and considerable interest has been directed at the hypothesis that Aβ peptides induce changes central to pathogenesis. Accordingly, molecules that reduce the levels of Aβ peptides have been discovered such as γ-secretase inhibitors (GSIs) and modulators (GSMs). GSIs and GSMs reduce Aβ levels through very different mechanisms. However, GSIs, but not GSMs, markedly increase the levels of APP CTFs that are increasingly viewed as disrupting neuronal function. Here, we evaluated the effects of GSIs and GSMs on a number of neuronal phenotypes possibly relevant to their use in treatment of AD. We report that GSI disrupted retrograde axonal trafficking of brain-derived neurotrophic factor (BDNF), suppressed BDNF-induced downstream signaling pathways and induced changes in the distribution within neuronal processes of mitochondria and synaptic vesicles. In contrast, treatment with a novel class of GSMs had no significant effect on these measures. Since knockdown of APP by specific siRNA prevented GSI-induced changes in BDNF axonal trafficking and signaling, we concluded that GSI effects on APP processing were responsible, at least in part, for BDNF trafficking and signaling deficits. Our findings argue that with respect to anti-amyloid treatments, even an APP-specific GSI may have deleterious effects and GSMs may serve as a better alternative.
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Affiliation(s)
- April M. Weissmiller
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - Orlangie Natera-Naranjo
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - Sol M. Reyna
- Department of Cellular and Molecular Medicine, University of California San Diego, San Diego, California, United States of America
| | - Matthew L. Pearn
- Department of Anesthesiology, University of California San Diego, San Diego, California, United States of America
- V.A. San Diego Healthcare System, San Diego, California, United States of America
| | - Xiaobei Zhao
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - Phuong Nguyen
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - Soan Cheng
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - Lawrence S. B. Goldstein
- Department of Cellular and Molecular Medicine, University of California San Diego, San Diego, California, United States of America
| | - Rudolph E. Tanzi
- Genetics and Aging Research Unit, Department of Neurology, Massachusetts General Hospital, Charlestown, Massachusetts, United States of America
| | - Steven L. Wagner
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - William C. Mobley
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
| | - Chengbiao Wu
- Department of Neurosciences, University of California San Diego, San Diego, California, United States of America
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The role of rab proteins in neuronal cells and in the trafficking of neurotrophin receptors. MEMBRANES 2014; 4:642-77. [PMID: 25295627 PMCID: PMC4289860 DOI: 10.3390/membranes4040642] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 08/27/2014] [Accepted: 09/16/2014] [Indexed: 12/11/2022]
Abstract
Neurotrophins are a family of proteins that are important for neuronal development, neuronal survival and neuronal functions. Neurotrophins exert their role by binding to their receptors, the Trk family of receptor tyrosine kinases (TrkA, TrkB, and TrkC) and p75NTR, a member of the tumor necrosis factor (TNF) receptor superfamily. Binding of neurotrophins to receptors triggers a complex series of signal transduction events, which are able to induce neuronal differentiation but are also responsible for neuronal maintenance and neuronal functions. Rab proteins are small GTPases localized to the cytosolic surface of specific intracellular compartments and are involved in controlling vesicular transport. Rab proteins, acting as master regulators of the membrane trafficking network, play a central role in both trafficking and signaling pathways of neurotrophin receptors. Axonal transport represents the Achilles' heel of neurons, due to the long-range distance that molecules, organelles and, in particular, neurotrophin-receptor complexes have to cover. Indeed, alterations of axonal transport and, specifically, of axonal trafficking of neurotrophin receptors are responsible for several human neurodegenerative diseases, such as Huntington's disease, Alzheimer's disease, amyotrophic lateral sclerosis and some forms of Charcot-Marie-Tooth disease. In this review, we will discuss the link between Rab proteins and neurotrophin receptor trafficking and their influence on downstream signaling pathways.
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