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Sagheddu C, Stojanovic T, Kouhnavardi S, Savchenko A, Hussein AM, Pistis M, Monje FJ, Plasenzotti R, Aufy M, Studenik CR, Lubec J, Lubec G. Cognitive performance in aged rats is associated with differences in distinctive neuronal populations in the ventral tegmental area and altered synaptic plasticity in the hippocampus. Front Aging Neurosci 2024; 16:1357347. [PMID: 38469164 PMCID: PMC10926450 DOI: 10.3389/fnagi.2024.1357347] [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: 12/17/2023] [Accepted: 02/12/2024] [Indexed: 03/13/2024] Open
Abstract
Introduction Deterioration of cognitive functions is commonly associated with aging, although there is wide variation in the onset and manifestation. Albeit heterogeneity in age-related cognitive decline has been studied at the cellular and molecular level, there is poor evidence for electrophysiological correlates. The aim of the current study was to address the electrophysiological basis of heterogeneity of cognitive functions in cognitively Inferior and Superior old (19-20 months) rats in the ventral tegmental area (VTA) and the hippocampus, having Young (12 weeks) rats as a control. The midbrain VTA operates as a hub amidst affective and cognitive facets, processing sensory inputs related to motivated behaviours and hippocampal memory. Increasing evidence shows direct dopaminergic and non-dopaminergic input from the VTA to the hippocampus. Methods Aged Superior and Inferior male rats were selected from a cohort of 88 animals based on their performance in a spatial learning and memory task. Using in vivo single-cell recording in the VTA, we examined the electrical activity of different neuronal populations (putative dopaminergic, glutamatergic and GABAergic neurons). In the same animals, basal synaptic transmission and synaptic plasticity were examined in hippocampal slices. Results Electrophysiological recordings from the VTA and hippocampus showed alterations associated with aging per se, together with differences specifically linked to the cognitive status of aged animals. In particular, the bursting activity of dopamine neurons was lower, while the firing frequency of glutamatergic neurons was higher in VTA of Inferior old rats. The response to high-frequency stimulation in hippocampal slices also discriminated between Superior and Inferior aged animals. Discussion This study provides new insight into electrophysiological information underlying compromised cerebral ageing. Further understanding of brain senescence, possibly related to neurocognitive decline, will help develop new strategies towards the preservation of a high quality of life.
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Affiliation(s)
- Claudia Sagheddu
- Division of Neuroscience and Clinical Pharmacology, Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy
| | - Tamara Stojanovic
- Programme for Proteomics, Paracelsus Medical University, Salzburg, Austria
| | - Shima Kouhnavardi
- Programme for Proteomics, Paracelsus Medical University, Salzburg, Austria
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Artem Savchenko
- Programme for Proteomics, Paracelsus Medical University, Salzburg, Austria
- Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia
| | - Ahmed M. Hussein
- Programme for Proteomics, Paracelsus Medical University, Salzburg, Austria
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
- Department of Zoology, Faculty of Science, Al-Azhar University, Asyut, Egypt
| | - Marco Pistis
- Division of Neuroscience and Clinical Pharmacology, Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy
- Section of Cagliari, Neuroscience Institute National Research Council of Italy (CNR), Cagliari, Italy
- Unit of Clinical Pharmacology, University Hospital, Cagliari, Italy
| | - Francisco J. Monje
- Center for Physiology and Pharmacology, Department of Neurophysiology and Neuropharmacology, Medical University of Vienna, Vienna, Austria
| | - Roberto Plasenzotti
- Division of Biomedical Research, Medical University of Vienna, Vienna, Austria
| | - Mohammed Aufy
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Christian R. Studenik
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Jana Lubec
- Programme for Proteomics, Paracelsus Medical University, Salzburg, Austria
| | - Gert Lubec
- Programme for Proteomics, Paracelsus Medical University, Salzburg, Austria
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Czarniak N, Kamińska J, Matowicka-Karna J, Koper-Lenkiewicz OM. Cerebrospinal Fluid-Basic Concepts Review. Biomedicines 2023; 11:biomedicines11051461. [PMID: 37239132 DOI: 10.3390/biomedicines11051461] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/08/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
Cerebrospinal fluid plays a crucial role in protecting the central nervous system (CNS) by providing mechanical support, acting as a shock absorber, and transporting nutrients and waste products. It is produced in the ventricles of the brain and circulates through the brain and spinal cord in a continuous flow. In the current review, we presented basic concepts related to cerebrospinal fluid history, cerebrospinal fluid production, circulation, and its main components, the role of the blood-brain barrier and the blood-cerebrospinal fluid barrier in the maintenance of cerebrospinal fluid homeostasis, and the utility of Albumin Quotient (QAlb) evaluation in the diagnosis of CNS diseases. We also discussed the collection of cerebrospinal fluid (type, number of tubes, and volume), time of transport to the laboratory, and storage conditions. Finally, we briefly presented the role of cerebrospinal fluid examination in CNS disease diagnosis of various etiologies and highlighted that research on identifying cerebrospinal fluid biomarkers indicating disease presence or severity, evaluating treatment effectiveness, and enabling understanding of pathogenesis and disease mechanisms is of great importance. Thus, in our opinion, research on cerebrospinal fluid is still necessary for both the improvement of CNS disease management and the discovery of new treatment options.
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Affiliation(s)
- Natalia Czarniak
- Department of Clinical Laboratory Diagnostics, Medical University of Bialystok, 15-269 Bialystok, Poland
| | - Joanna Kamińska
- Department of Clinical Laboratory Diagnostics, Medical University of Bialystok, 15-269 Bialystok, Poland
| | - Joanna Matowicka-Karna
- Department of Clinical Laboratory Diagnostics, Medical University of Bialystok, 15-269 Bialystok, Poland
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Chen WB, Wang YX, Wang HG, An D, Sun D, Li P, Zhang T, Lu WG, Liu YQ. Role of TPEN in Amyloid-β 25-35-Induced Neuronal Damage Correlating with Recovery of Intracellular Zn 2+ and Intracellular Ca 2+ Overloading. Mol Neurobiol 2023:10.1007/s12035-023-03322-x. [PMID: 37059931 DOI: 10.1007/s12035-023-03322-x] [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: 11/18/2022] [Accepted: 03/17/2023] [Indexed: 04/16/2023]
Abstract
The overproduction of neurotoxic amyloid-β (Aβ) peptides in the brain is a hallmark of Alzheimer's disease (AD). To determine the role of intracellular zinc ion (iZn2+) dysregulation in mediating Aβ-related neurotoxicity, this study aimed to investigate whether N, N, N', N'‑tetrakis (2‑pyridylmethyl) ethylenediamine (TPEN), a Zn2+‑specific chelator, could attenuate Aβ25-35‑induced neurotoxicity and the underlying mechanism. We used the 3-(4, 5-dimethyl-thiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay to measure the viability of primary hippocampal neurons. We also determined intracellular Zn2+ and Ca2+ concentrations, mitochondrial and lysosomal functions, and intracellular reactive oxygen species (ROS) content in hippocampal neurons using live-cell confocal imaging. We detected L-type voltage-gated calcium channel currents (L-ICa) in hippocampal neurons using the whole‑cell patch‑clamp technique. Furthermore, we measured the mRNA expression levels of proteins related to the iZn2+ buffer system (ZnT-3, MT-3) and voltage-gated calcium channels (Cav1.2, Cav1.3) in hippocampal neurons using RT-PCR. The results showed that TPEN attenuated Aβ25-35‑induced neuronal death, relieved the Aβ25-35‑induced increase in intracellular Zn2+ and Ca2+ concentrations; reversed the Aβ25-35‑induced increase in ROS content, the Aβ25-35‑induced increase in the L-ICa peak amplitude at different membrane potentials, the Aβ25-35‑induced the dysfunction of the mitochondria and lysosomes, and the Aβ25-35‑induced decrease in ZnT-3 and MT-3 mRNA expressions; and increased the Cav1.2 mRNA expression in the hippocampal neurons. These results suggest that TPEN, the Zn2+-specific chelator, attenuated Aβ25-35‑induced neuronal damage, correlating with the recovery of intracellular Zn2+ and modulation of abnormal Ca2+-related signaling pathways.
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Affiliation(s)
- Wen-Bo Chen
- College of Life Sciences, Nankai University, Tianjin, 300071, China
- School of Basic Medical Science, Henan University, Kaifeng, 475004, China
| | - Yu-Xiang Wang
- Department of Immunology and Pathogenic Biology, School of Basic Medical Sciences, Hebei University of Chinese Medicine, Shijiazhuang, 050200, Hebei, China
| | - Hong-Gang Wang
- College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Di An
- College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Dan Sun
- College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Pan Li
- Tianjin Key Laboratory of Cerebral Vascular and Neurodegenerative Diseases, Tianjin Neurosurgery Institute, Department of Neurology, Tianjin Huanhu Hospital Affiliated to Nankai University, Tianjin, China
| | - Tao Zhang
- College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Wan-Ge Lu
- College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Yan-Qiang Liu
- College of Life Sciences, Nankai University, Tianjin, 300071, China.
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Badillo-Ramírez I, Landeros-Rivera B, Saniger JM, Popp J, Cialla-May D. SERS-based detection of 5- S-cysteinyl-dopamine as a novel biomarker of Parkinson's disease in artificial biofluids. Analyst 2023; 148:1848-1857. [PMID: 36939184 DOI: 10.1039/d3an00027c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
The early detection of Parkinson's disease (PD) can significantly improve treatment and quality of life in patients. 5-S-Cysteinyl-dopamine (CDA) is a key metabolite of high relevance for the early detection of PD. Therefore, its sensitive detection with fast and robust methods can improve its use as a biomarker. In this work we show the potentialities of label-free SERS spectroscopy in detecting CDA in aqueous solutions and artificial biofluids, with a simple, fast and sensitive approach. We present a detailed experimental SERS band assignment of CDA employing silver nanoparticle (AgNP) substrates in aqueous media, which was supported by theoretical calculations and simulated Raman and SERS spectra. The tentative orientation of CDA over the AgNP was also studied, indicating that catechol and carboxylic acid play a key role in the metallic surface adsorption. Moreover, we showed that SERS can allow us to identify CDA in aqueous media at low concentration, leading to the identification of some of its characteristic bands in pure water and in synthetic cerebrospinal fluid (SCSF) below 1 × 10-8 M, while its band identification in simulated urine (SUR) can be reached at 1 × 10-7 M. In conclusion, we show that CDA can be suitably detected by means of label-free SERS spectroscopy, which can significantly improve its sensitive detection for further analytical studies as a novel biomarker and further clinical diagnosis in PD patients.
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Affiliation(s)
- Isidro Badillo-Ramírez
- Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Health Technology, Technical University of Denmark, Kongens Lyngby 2800, Denmark.
| | - Bruno Landeros-Rivera
- Facultad de Química, Departamento de Química Inorgánica y Nuclear, Universidad Nacional Autónoma de México, Circuito exterior S/N, Ciudad Universitaria, 04510, Ciudad de México, Mexico
| | - José M Saniger
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito exterior S/N, Ciudad Universitaria, 04510, Ciudad de México, Mexico
| | - Jürgen Popp
- Friedrich Schiller University Jena, Institute of Physical Chemistry and Abbe Center of Photonics, Helmholtzweg 4, 07743 Jena, Germany.,Leibniz Institute of Photonic Technology Jena, Member of the Leibniz Research Alliance - Leibniz Health Technologies, Albert-Einstein-Str. 9, 07745 Jena, Germany
| | - Dana Cialla-May
- Friedrich Schiller University Jena, Institute of Physical Chemistry and Abbe Center of Photonics, Helmholtzweg 4, 07743 Jena, Germany.,Leibniz Institute of Photonic Technology Jena, Member of the Leibniz Research Alliance - Leibniz Health Technologies, Albert-Einstein-Str. 9, 07745 Jena, Germany
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Takeda A. [Brain Function and Pathophysiology Focused on Zn 2+ Dynamics]. YAKUGAKU ZASSHI 2022; 142:855-866. [PMID: 35908946 DOI: 10.1248/yakushi.22-00074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The basal levels of intracellular Zn2+ and extracellular Zn2+ are in the range of ~100 pM and ~10 nM, respectively, in the brain. Extracellular Zn2+ dynamics is involved in both cognitive performance and neurodegeneration. The bidirectional actions are linked with extracellular glutamate and amyloid-β1-42 (Aβ1-42). Intracellular Zn2+ signaling via extracellular glutamate is required for learning and memory, while intracellular Zn2+ dysregulation induces cognitive decline. Furthermore, human Aβ1-42, a causative peptide in Alzheimer's disease pathogenesis captures extracellular Zn2+ and readily taken up into hippocampal neurons followed by intracellular Zn2+ dysregulation. Aβ1-42-mediated intracellular Zn2+ dysregulation is accelerated with aging, because extracellular Zn2+ is age-relatedly increased, resulting in Aβ1-42-induced cognitive decline and neurodegeneration with aging. On the other hand, metallothioneins, zinc-binding proteins can capture Zn2+ released from intracellular Zn-Aβ1-42 complexes and serve for intracellular Zn2+-buffering to maintain intracellular Zn2+ homeostasis. This review summarizes Zn2+ function and its neurotoxicity in the brain, and also the potential defense strategy via metallothioneins against Aβ1-42-induced pathogenesis.
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Affiliation(s)
- Atsushi Takeda
- School of Pharmaceutical Sciences, University of Shizuoka
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Stangler LA, Kouzani A, Bennet KE, Dumee L, Berk M, Worrell GA, Steele S, Burns TC, Howe CL. Microdialysis and microperfusion electrodes in neurologic disease monitoring. Fluids Barriers CNS 2021; 18:52. [PMID: 34852829 PMCID: PMC8638547 DOI: 10.1186/s12987-021-00292-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/23/2021] [Indexed: 11/10/2022] Open
Abstract
Contemporary biomarker collection techniques in blood and cerebrospinal fluid have to date offered only modest clinical insights into neurologic diseases such as epilepsy and glioma. Conversely, the collection of human electroencephalography (EEG) data has long been the standard of care in these patients, enabling individualized insights for therapy and revealing fundamental principles of human neurophysiology. Increasing interest exists in simultaneously measuring neurochemical biomarkers and electrophysiological data to enhance our understanding of human disease mechanisms. This review compares microdialysis, microperfusion, and implanted EEG probe architectures and performance parameters. Invasive consequences of probe implantation are also investigated along with the functional impact of biofouling. Finally, previously developed microdialysis electrodes and microperfusion electrodes are reviewed in preclinical and clinical settings. Critically, current and precedent microdialysis and microperfusion probes lack the ability to collect neurochemical data that is spatially and temporally coincident with EEG data derived from depth electrodes. This ultimately limits diagnostic and therapeutic progress in epilepsy and glioma research. However, this gap also provides a unique opportunity to create a dual-sensing technology that will provide unprecedented insights into the pathogenic mechanisms of human neurologic disease.
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Affiliation(s)
- Luke A Stangler
- School of Engineering, Deakin University, 3216, Geelong, Victoria, Australia
- Division of Engineering, Mayo Clinic, 55905, Rochester, MN, USA
| | - Abbas Kouzani
- School of Engineering, Deakin University, 3216, Geelong, Victoria, Australia
| | - Kevin E Bennet
- School of Engineering, Deakin University, 3216, Geelong, Victoria, Australia
- Division of Engineering, Mayo Clinic, 55905, Rochester, MN, USA
| | - Ludovic Dumee
- School of Engineering, Deakin University, 3216, Geelong, Victoria, Australia
| | - Michael Berk
- School of Medicine, Deakin University, 3216, Geelong, Victoria, Australia
| | | | - Steven Steele
- Division of Engineering, Mayo Clinic, 55905, Rochester, MN, USA
| | - Terence C Burns
- Department of Neurosurgery, Mayo Clinic, 55905, Rochester, MN, USA
| | - Charles L Howe
- Department of Neurology, Mayo Clinic, 55905, Rochester, MN, USA.
- Division of Experimental Neurology, Mayo Clinic, 55905, Rochester, MN, USA.
- Center for MS and Autoimmune Neurology, Mayo Clinic, 55905, Rochester, MN, USA.
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Chen WB, Wang YX, Wang HG, An D, Sun D, Li P, Zhang T, Lu WG, Liu YQ. TPEN attenuates amyloid-β 25-35-induced neuronal damage with changes in the electrophysiological properties of voltage-gated sodium and potassium channels. Mol Brain 2021; 14:124. [PMID: 34384467 PMCID: PMC8359616 DOI: 10.1186/s13041-021-00837-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 08/02/2021] [Indexed: 11/10/2022] Open
Abstract
To understand the role of intracellular zinc ion (Zn2+) dysregulation in mediating age-related neurodegenerative changes, particularly neurotoxicity resulting from the generation of excessive neurotoxic amyloid-β (Aβ) peptides, this study aimed to investigate whether N, N, N', N'-tetrakis (2-pyridylmethyl) ethylenediamine (TPEN), a Zn2+-specific chelator, could attenuate Aβ25-35-induced neurotoxicity and the underlying electrophysiological mechanism. We used the 3-(4, 5-dimethyl-thiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay to measure the viability of hippocampal neurons and performed single-cell confocal imaging to detect the concentration of Zn2+ in these neurons. Furthermore, we used the whole-cell patch-clamp technique to detect the evoked repetitive action potential (APs), the voltage-gated sodium and potassium (K+) channels of primary hippocampal neurons. The analysis showed that TPEN attenuated Aβ25-35-induced neuronal death, reversed the Aβ25-35-induced increase in intracellular Zn2+ concentration and the frequency of APs, inhibited the increase in the maximum current density of voltage-activated sodium channel currents induced by Aβ25-35, relieved the Aβ25-35-induced decrease in the peak amplitude of transient outward K+ currents (IA) and outward-delayed rectifier K+ currents (IDR) at different membrane potentials, and suppressed the steady-state activation and inactivation curves of IA shifted toward the hyperpolarization direction caused by Aβ25-35. These results suggest that Aβ25-35-induced neuronal damage correlated with Zn2+ dysregulation mediated the electrophysiological changes in the voltage-gated sodium and K+ channels. Moreover, Zn2+-specific chelator-TPEN attenuated Aβ25-35-induced neuronal damage by recovering the intracellular Zn2+ concentration.
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Affiliation(s)
- Wen-Bo Chen
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China
| | - Yu-Xiang Wang
- Department of Immunology and Pathogenic Biology, School of Basic Medical Sciences, Hebei University of Chinese Medicine, Shijiazhuang, 050200, Hebei, People's Republic of China
| | - Hong-Gang Wang
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China
| | - Di An
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China
| | - Dan Sun
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China
| | - Pan Li
- Tianjin Key Laboratory of Cerebral Vascular and Neurodegenerative Diseases, Tianjin Neurosurgery Institute, Department of Neurology, Tianjin Huanhu Hospital Affiliated to Nankai University, Tianjin, People's Republic of China
| | - Tao Zhang
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China
| | - Wan-Ge Lu
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China
| | - Yan-Qiang Liu
- College of Life Sciences, Nankai University, Tianjin, 300071, People's Republic of China.
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Sato Y, Takiguchi M, Tamano H, Takeda A. Extracellular Zn 2+-Dependent Amyloid-β 1-42 Neurotoxicity in Alzheimer's Disease Pathogenesis. Biol Trace Elem Res 2021; 199:53-61. [PMID: 32281074 DOI: 10.1007/s12011-020-02131-w] [Citation(s) in RCA: 6] [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] [Received: 01/28/2020] [Accepted: 03/23/2020] [Indexed: 02/07/2023]
Abstract
The basal level of extracellular Zn2+ is in the range of low nanomolar (~ 10 nM) in the hippocampus. However, extracellular Zn2+ dynamics plays a key role for not only cognitive activity but also cognitive decline. Extracellular Zn2+ dynamics is modified by glutamatergic synapse excitation and the presence of amyloid-β1-42 (Aβ1-42), a causative peptide in Alzheimer's disease (AD). When human Aβ1-42 reaches high picomolar (> 100 pM) in the extracellular compartment of the rat dentate gyrus, Zn-Aβ1-42 complexes are readily formed and taken up into dentate granule cells, followed by Aβ1-42-induced cognitive decline that is linked with Zn2+ released from intracellular Zn-Aβ1-42 complexes. Aβ1-42-induced intracellular Zn2+ toxicity is accelerated with aging because of age-related increase in extracellular Zn2+. The recent findings suggest that Aβ1-42 secreted continuously from neuron terminals causes age-related cognitive decline and neurodegeneration via intracellular Zn2+ dysregulation. On the other hand, metallothioneins (MTs), zinc-binding proteins, quickly serve for intracellular Zn2+-buffering under acute intracellular Zn2+ dysregulation. On the basis of the idea that the defense strategy against Aβ1-42-induced pathogenesis leads to preventing the AD development, this review deals with extracellular Zn2+-dependent Aβ1-42 neurotoxicity, which is accelerated with aging.
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Affiliation(s)
- Yuichi Sato
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Mako Takiguchi
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan.
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Atsushi T, Tamano H. New insight into Parkinson's disease pathogenesis from reactive oxygen species-mediated extracellular Zn 2+ influx. J Trace Elem Med Biol 2020; 61:126545. [PMID: 32438294 DOI: 10.1016/j.jtemb.2020.126545] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/07/2020] [Accepted: 04/30/2020] [Indexed: 01/21/2023]
Abstract
BACKGROUND Parkinson's disease (PD) is the common neurodegenerative disorder in the elderly characterized by motor symptoms such as tremors, which is caused by selective loss of nigral dopaminergic neurons. Oxidative stress induced by the auto-oxidation of dopamine has been implicated as a key cause of the selective loss of dopaminergic neurons. METHODS To understand the selective loss of nigral dopaminergic neurons, the PD pathogenesis is reviewed focused on paraquat (PQ) and 6-hydroxydopamine (6-OHDA)-induced PD in rats. RESULTS Reactive oxygen species (ROS), which are produced by PQ and 6-OHDA, are retrogradely transported to presynaptic glutamatergic neuron terminals. ROS activate presynaptic transient receptor potential melastatin 2 (TRPM2) cation channels and induce extracellular glutamate accumulation in the substantia nigra pars compacta (SNpc), followed by age-related intracellular Zn2+ dysregulation. Loss of nigral dopaminergic neurons is accelerated by age-related intracellular Zn2+ dysregulation in the SNpc of rat PD models. The intracellular Zn2+ dysregulation in nigral dopaminergic neurons is linked with the rapid influx of extracellular Zn2+ via postsynaptic AMPA receptor activation, suggesting that PQ- and 6-OHDA-induced pathogenesis is linked with age-related intracellular Zn2+ dysregulation in the SNpc. Postsynaptic TRPM2 channels may be also involved in intracellular Zn2+ dysregulation in the SNpc. CONCLUSION A novel mechanism of nigral dopaminergic degeneration, in which ROS induce rapid intracellular Zn2+ dysregulation, figures out the PD pathogenesis induced by PQ and 6-OHDA in rats. This review deals with new insight into PD pathogenesis from ROS-mediated extracellular Zn2+ influx and its proposed defense strategy.
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Affiliation(s)
- Takeda Atsushi
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
| | - Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
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Tamano H, Takiguchi M, Tanaka Y, Murakami T, Adlard PA, Bush AI, Takeda A. Preferential Neurodegeneration in the Dentate Gyrus by Amyloid β 1-42-Induced Intracellular Zn 2+Dysregulation and Its Defense Strategy. Mol Neurobiol 2019; 57:1875-1888. [PMID: 31865526 DOI: 10.1007/s12035-019-01853-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 12/11/2019] [Indexed: 12/18/2022]
Abstract
On the basis of the evidence that rapid intracellular Zn2+ dysregulation by amyloid β1-42 (Aβ1-42) in the normal hippocampus transiently induces cognitive decline, here we report preferential neurodegeneration in the dentate gyrus by Aβ1-42-induced intracellular Zn2+ dysregulation and its defense strategy. Neurodegeneration was preferentially observed in the dentate granule cell layer in the hippocampus after a single Aβ1-42 injection into the lateral ventricle but not in the CA1 and CA3 pyramidal cell layers, while intracellular Zn2+ dysregulation was extensively observed in the hippocampus in addition to the dentate gyrus. Neurodegeneration in the dentate granule cell layer was rescued after co-injection of extracellular and intracellular Zn2+ chelators, i.e., CaEDTA and ZnAF-2DA, respectively. Aβ1-42-induced cognitive impairment was also rescued by co-injection of CaEDTA and ZnAF-2DA. Pretreatment with dexamethasone, an inducer of metalothioneins, Zn2+-binding proteins rescued neurodegeneration in the dentate granule cell layer and cognitive impairment via blocking the intracellular Zn2+ dysregulation induced by Aβ1-42. The present study indicates that intracellular Zn2+ dysregulation induced by Aβ1-42 preferentially causes neurodegeneration in the dentate gyrus, resulting in hippocampus-dependent cognitive decline. It is likely that controlling intracellular Zn2+ dysregulation, which is induced by the rapid uptake of Zn-Aβ1-42 complexes, is a defense strategy for Alzheimer's disease pathogenesis.
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Affiliation(s)
- Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Mako Takiguchi
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Yukino Tanaka
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Taku Murakami
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Paul A Adlard
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, 3052, Australia
| | - Ashley I Bush
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, 3052, Australia
| | - Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan.
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Tamano H, Takeda A. Age-Dependent Modification of Intracellular Zn 2+ Buffering in the Hippocampus and Its Impact. Biol Pharm Bull 2019; 42:1070-1075. [PMID: 31257282 DOI: 10.1248/bpb.b18-00631] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The basal concentrations of extracellular Zn2+ and intracellular Zn2+, which are approximately 10 nM and 100 pM, respectively, in the brain, are markedly lower than those of extracellular Ca2+ (1.3 mM) and intracellular Ca2+ (100 nM), respectively, resulting in much less attention paid to Zn2+ than to Ca2+. However, intracellular Zn2+ dysregulation, which is closely linked with glutamate- and amyloid β-mediated extracellular Zn2+ influx, is more critical for cognitive decline and neurodegeneration than intracellular Ca2+ dysregulation. It is estimated that the age-dependent increase in the basal concentration of extracellular Zn2+ in the hippocampus plays a key role in cognitive decline and neurodegeneration. The characteristics of extracellular Zn2+ influx in the hippocampus may be modified age-dependently, probably followed by modification of intracellular Zn2+ buffering that is closely linked with age-related cognitive decline and neurodegeneration. Reduction of intracellular Zn2+-buffering capacity may be linked with the pathophysiology of progressive neurodegeneration such as Alzheimer's disease. This paper deals with age-dependent modification of intracellular Zn2+ buffering in the hippocampus and its impact. On the basis of the estimated impact, we propose a potential defense strategy against Zn2+-mediated neurodegeneration, i.e., metallothionein induction in the hippocampus.
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Affiliation(s)
- Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka
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Zhang X, Liu S, Song X, Wang H, Wang J, Wang Y, Huang J, Yu J. Robust and Universal SERS Sensing Platform for Multiplexed Detection of Alzheimer's Disease Core Biomarkers Using PAapt-AuNPs Conjugates. ACS Sens 2019; 4:2140-2149. [PMID: 31353891 DOI: 10.1021/acssensors.9b00974] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Multiplexed detection of Alzheimer's disease (AD) core biomarkers is of great significance to early diagnosis and personalized treatment of AD patients. Herein, we construct a robust and convenient surface-enhanced Raman scattering (SERS) biosensing platform for simultaneous detection of Aβ(1-42) oligomers and Tau protein using different Raman dye-coded polyA aptamer-AuNPs (PAapt-AuNPs) conjugates. This strategy relies on the specific protein-aptamer binding-mediated aggregation of AuNPs and the concomitant plasmonic coupling effect that allow us to "turn on" SERS detection of protein biomarkers. To the best of our knowledge, this is the first work in which PAapt-AuNPs conjugates are used for probing protein biomarkers, which may be enlightening for the exploitation of more extensive biological applications of aptamer-AuNPs conjugates. The results reveal that the present strategy displays excellent analytical performance. Moreover, the applicability of this strategy is demonstrated in the artificial cerebrospinal fluid (CSF) samples with satisfactory results. Except for the prominent sensitivity and practicality, our strategy offers additional advantages. The preparation of nanoconjugates is handy and easily repeated, and the synthesis cost is greatly reduced because it dispenses with the complicated labeling process. Moreover, the assay can be accomplished in 15 min, allowing rapid detection of protein biomarkers. Furthermore, simultaneous detection of Tau protein and Aβ(1-42) oligomers is realized by employing different Raman dye-coded nanoconjugates, which is valuable for accurately predicting and diagnosing AD disease. Thus, our PAapt-AuNPs conjugate-based multiplexed SERS strategy indeed creates a useful and universal platform for detecting multiple protein biomarkers and related clinical diagnosis.
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Paraquat as an Environmental Risk Factor in Parkinson's Disease Accelerates Age-Related Degeneration Via Rapid Influx of Extracellular Zn 2+ into Nigral Dopaminergic Neurons. Mol Neurobiol 2019; 56:7789-7799. [PMID: 31119555 DOI: 10.1007/s12035-019-01642-5] [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: 12/28/2018] [Accepted: 05/10/2019] [Indexed: 10/26/2022]
Abstract
On the basis of the evidence that paraquat (PQ)-induced extracellular Zn2+ influx causes PQ-induced pathogenesis in the substantia nigra pars compacta (SNpc) of rats, we postulated that the transient receptor potential melastatin 2 (TRPM2) cation channels activated with PQ-induced reactive oxygen species (ROS) are linked with extracellular glutamate accumulation in the SNpc, followed by age-related intracellular Zn2+ dysregulation. Presynaptic activity (glutamate exocytosis), which was determined with FM4-64, was enhanced in the SNpc after exposure to PQ, and the enhancement was inhibited in the presence of N-(p-amylcinnamoyl)anthranilic acid (ACA), a blocker of TRPM2 cation channels, suggesting that PQ-induced ROS enhances presynaptic activity in the SNpc, probably via TRPM2 channel activation. Extracellular glutamate concentration in the SNpc was increased almost to the same extent under the SNpc perfusion with PQ of young and aged rats, and was suppressed by co-perfusion with ACA, suggesting that PQ-induced TRPM2 cation channel activation enhances glutamate exocytosis in the SNpc. Interestingly, PQ more markedly increased intracellular Zn2+ in the aged SNpc, which was also blocked by co-injection of ACA and CaEDTA, an extracellular Zn2+ chelator. Loss of nigrostriatal dopaminergic neurons was more severely increased in aged rats and completely blocked by co-injection of PQ and CaEDTA into the SNpc. The present study indicates that rapid influx of extracellular Zn2+ into dopaminergic neurons via PQ-induced TRPM2 cation channel activation accelerates nigrostriatal dopaminergic degeneration in aged rats. It is likely that vulnerability to PQ-induced pathogenesis in the aged SNpc is due to accelerated intracellular Zn2+ dysregulation.
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Takeda A, Tamano H. Is Vulnerability of the Dentate Gyrus to Aging and Amyloid-β 1-42 Neurotoxicity Linked with Modified Extracellular Zn 2+ Dynamics? Biol Pharm Bull 2018; 41:995-1000. [PMID: 29962410 DOI: 10.1248/bpb.b17-00871] [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] [Indexed: 11/22/2022]
Abstract
The basal levels of extracellular Zn2+ are in the range of low nanomolar concentrations in the hippocampus and perhaps increase age-dependently. Extracellular Zn2+ dynamics is critical for cognitive activity and excess influx of extracellular Zn2+ into hippocampal neurons is a known cause of cognitive decline. The dentate gyrus is vulnerable to aging in the hippocampus and affected in the early stage of Alzheimer's disease (AD). The reasons remain unclear. Neurogenesis-related apoptosis may induce non-specific neuronal depolarization by efflux of intracellular K+ in the dentate gyrus and be markedly increased along with aging. Extracellular Zn2+ influx into dentate granule cells via high K+-induced perforant pathway excitation leads to cognitive decline. Modified extracellular Zn2+ dynamics in the dentate gyrus of aged rats is linked with vulnerability to cognitive decline. Amyloid-β1-42 (Aβ1-42) is a causative candidate for AD pathogenesis. When Aβ1-42 concentration reaches picomolar in the extracellular compartment in the dentate gyrus, Zn-Aβ1-42 is formed in the extracellular compartment and rapidly taken up into dentate granule cells, followed by Aβ1-42-induced cognitive decline that is due to Zn2+ released from Aβ1-42, suggesting that dentate granule cells are sensitive to extracellular Zn2+-dependent Aβ1-42 toxicity. This paper deals with proposed vulnerability of the dentate gyrus to aging and Aβ1-42 neurotoxicity.
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Affiliation(s)
- Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka
| | - Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka
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Tamano H, Morioka H, Nishio R, Takeuchi A, Takeda A. Blockade of Rapid Influx of Extracellular Zn 2+ into Nigral Dopaminergic Neurons Overcomes Paraquat-Induced Parkinson's Disease in Rats. Mol Neurobiol 2018; 56:4539-4548. [PMID: 30341553 DOI: 10.1007/s12035-018-1398-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 10/14/2018] [Indexed: 02/02/2023]
Abstract
The herbicide paraquat (PQ) has been reported to enhance the risk of developing Parkinson's disease (PD) from epidemiological studies. PQ-induced reactive oxygen species (ROS) are linked with a selective loss of nigrostriatal dopaminergic neurons. Here, we first report a unique mechanism of nigrostriatal dopaminergic degeneration, in which rapid intracellular Zn2+ dysregulation via PQ-induced ROS production causes PD in rats. When the substantia nigra pars compacta (SNpc) of rats was perfused with PQ, extracellular concentrations of glutamate and Zn2+ were increased and decreased, respectively, in the SNpc. These changes were ameliorated by co-perfusion with Trolox, an antioxidative agent. In in vitro slice experiments, PQ rapidly increased extracellular Zn2+ influx via AMPA receptor activation. Both loss of nigrostriatal dopaminergic neurons and increase in turning behavior in response to apomorphine were markedly reduced by coinjection of PQ and intracellular Zn2+ chelator, i.e., ZnAF-2DA into the SNpc. Furthermore, loss of nigrostriatal dopaminergic neurons induced with a low dose of PQ, which did not induce any behavioral abnormality, was completely blocked by coinjection of ZnAF-2DA. The present study indicates that rapid influx of extracellular Zn2+ into dopaminergic neurons via AMPA receptor activation, which is initially induced by PQ-mediated ROS production in the SNpc, induces nigrostriatal dopaminergic degeneration, resulting in PQ-induced PD in rats. Intracellular Zn2+ dysregulation in dopaminergic neurons is the cause of PQ-induced pathogenesis in the SNpc, and the block of intracellular Zn2+ toxicity leads to defending PQ-induced pathogenesis.
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Affiliation(s)
- Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Hiroki Morioka
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Ryusuke Nishio
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Azusa Takeuchi
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan.
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Santhakumar H, Nair RV, Philips DS, Shenoy SJ, Thekkuveettil A, Ajayaghosh A, Jayasree RS. Real Time Imaging and Dynamics of Hippocampal Zn 2+ under Epileptic Condition Using a Ratiometric Fluorescent Probe. Sci Rep 2018; 8:9069. [PMID: 29899532 PMCID: PMC5998144 DOI: 10.1038/s41598-018-27029-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 05/23/2018] [Indexed: 01/07/2023] Open
Abstract
Zinc, the essential trace element in human body exists either in the bound or free state, for both structural and functional roles. Insights on Zn2+ distribution and its dynamics are essential in view of the fact that Zn2+ dyshomeostasis is a risk factor for epileptic seizures, Alzheimer's disease, depression, etc. Herein, a bipyridine bridged bispyrrole (BP) probe is used for ratiometric imaging and quantification of Zn2+ in hippocampal slices. The green fluorescence emission of BP shifts towards red in the presence of Zn2+. The probe is used to detect and quantify the exogenous and endogenous Zn2+ in glioma cells and hippocampal slices. The dynamics of chelatable zinc ions during epileptic condition is studied in the hippocampal neurons, in vitro wherein the translocation of Zn2+ from presynaptic to postsynaptic neuronal bodies is imaged and ratiometrically quantified. Raman mapping technique is used to confirm the dynamics of Zn2+ under epileptic condition. Finally, the Zn2+ distribution was imaged in vivo in epileptic rats and the total Zn2+ in rat brain was quantified. The results favour the use of BP as an excellent Zn2+ imaging probe in biological system to understand the zinc associated diseases and their management.
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Affiliation(s)
- Hema Santhakumar
- Division of Biophotonics and Imaging, Bio Medical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Trivandrum, 695012, Kerala, India
| | - Resmi V Nair
- Division of Biophotonics and Imaging, Bio Medical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Trivandrum, 695012, Kerala, India
| | - Divya Susan Philips
- Photosciences and Photonics Group, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum, 695019, Kerala, India
| | - Sachin J Shenoy
- Division of In Vivo Models and Testing, SCTIMST, Trivandrum, 695012, Kerala, India
| | | | - Ayyappanpillai Ajayaghosh
- Photosciences and Photonics Group, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum, 695019, Kerala, India.
| | - Ramapurath S Jayasree
- Division of Biophotonics and Imaging, Bio Medical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Trivandrum, 695012, Kerala, India.
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Takeda A, Tamano H, Hashimoto W, Kobuchi S, Suzuki H, Murakami T, Tempaku M, Koike Y, Adlard PA, Bush AI. Novel Defense by Metallothionein Induction Against Cognitive Decline: From Amyloid β 1-42-Induced Excess Zn 2+ to Functional Zn 2+ Deficiency. Mol Neurobiol 2018; 55:7775-7788. [PMID: 29460269 DOI: 10.1007/s12035-018-0948-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 01/31/2018] [Indexed: 02/07/2023]
Abstract
The role of metallothioneins (MTs) in cognitive decline associated with intracellular Zn2+ dysregulation remains unclear. Here, we report that hippocampal MT induction defends cognitive decline, which was induced by amyloid β1-42 (Aβ1-42)-mediated excess Zn2+ and functional Zn2+ deficiency. Excess increase in intracellular Zn2+, which was induced by local injection of Aβ1-42 into the dentate granule cell layer, attenuated in vivo perforant pathway LTP, while the attenuation was rescued by preinjection of MT inducers into the same region. Intraperitoneal injection of dexamethasone, which increased hippocampal MT proteins and blocked Aβ1-42-mediated Zn2+ uptake, but not Aβ1-42 uptake, into dentate granule cells, also rescued Aβ1-42-induced impairment of memory via attenuated LTP. The present study indicates that hippocampal MT induction blocks rapid excess increase in intracellular Zn2+ in dentate granule cells, which originates in Zn2+ released from Aβ1-42, followed by rescuing Aβ1-42-induced cognitive decline. Furthermore, LTP was vulnerable to Aβ1-42 in the aged dentate gyrus, consistent with enhanced Aβ1-42-mediated Zn2+ uptake into aged dentate granule cells, suggesting that Aβ1-42-induced cognitive decline, which is caused by excess intracellular Zn2+, can more frequently occur along with aging. On the other hand, attenuated LTP under functional Zn2+ deficiency in dentate granule cells was also rescued by MT induction. Hippocampal MT induction may rescue cognitive decline under lack of cellular transient changes in functional Zn2+ concentration, while its induction is an attractive defense strategy against Aβ1-42-induced cognitive decline.
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Affiliation(s)
- Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan.
| | - Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Wakana Hashimoto
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Shuhei Kobuchi
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Hiroki Suzuki
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Taku Murakami
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Munekazu Tempaku
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Yuta Koike
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Paul A Adlard
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, 3052, Australia
| | - Ashley I Bush
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, 3052, Australia
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Yu A, Lv J, Yuan F, Xia Z, Fan K, Chen G, Ren J, Lin C, Wei S, Yang F. mPEG-PLA/TPGS mixed micelles via intranasal administration improved the bioavailability of lamotrigine in the hippocampus. Int J Nanomedicine 2017; 12:8353-8362. [PMID: 29200847 PMCID: PMC5701607 DOI: 10.2147/ijn.s145488] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Purpose This study aimed to develop a novel methoxy poly(ethylene glycol)-poly(lactide) (mPEG-PLA)/D-α-tocopherol polyethylene glycol 1000 succinate (TPGS) mixed micelle drug delivery system to improve lamotrigine (LTG) distribution in the hippocampus. Methods LTG-loaded mPEG-PLA/TPGS mixed micelles and LTG-loaded mPEG-PLA micelles were formulated, and their characteristics, particle size, surface morphology, and release behavior in vitro were researched. Then, a microdialysis sampling technique coupled with two validated chromatographic systems was developed for the continuous measurement of the protein-unbound form of LTG in the rat plasma and hippocampus after administering two kinds of micelles and LTG solution intranasally. Results The drug loading and mean size of LTG-loaded micelles and LTG-loaded mixed micelles prepared with optimal formulation were 36.44%±0.14%, 39.28%±0.26%, 122.9, and 183.5 nm, respectively, with a core–shell structure. The cumulative release rate in vivo of LTG-loaded mixed micelles was 84.21% at 24 hours and showed more sustained release while that of LTG-loaded micelles was 80.61% at 6 hours. The Tmax and area under concentration-time curve from zero to time of last quantifiable concentration of LTG solution, LTG-loaded micelles, and LTG-loaded mixed micelles were 55, 35, and 15 minutes and about 5,384, 16,500, and 25,245 (min⋅μg)/L in the hippocampus, respectively. Conclusion The results revealed that LTG-loaded mPEG-PLA/TPGS mixed micelles enhanced the absorption of LTG at the nasal cavity and reduced the efflux of LTG in the brain, suggesting that the function of TPGS inhibited P-glycoprotein and LTG-loaded mPEG-PLA/TPGS mixed micelles had the potential to overcome refractory epilepsy.
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Affiliation(s)
| | | | | | | | | | - Gang Chen
- Department of Pharmaceutics.,Guangdong Provincial Engineering Center of Topical Precise Drug Delivery System, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | | | | | - Shijie Wei
- Department of Pharmaceutics.,Guangdong Provincial Engineering Center of Topical Precise Drug Delivery System, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | - Fan Yang
- Department of Pharmaceutics.,Guangdong Provincial Engineering Center of Topical Precise Drug Delivery System, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
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Takeda A, Tamano H. The Impact of Synaptic Zn 2+ Dynamics on Cognition and Its Decline. Int J Mol Sci 2017; 18:ijms18112411. [PMID: 29135924 PMCID: PMC5713379 DOI: 10.3390/ijms18112411] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 10/31/2017] [Accepted: 11/09/2017] [Indexed: 11/16/2022] Open
Abstract
The basal levels of extracellular Zn2+ are in the range of low nanomolar concentrations and less attention has been paid to Zn2+, compared to Ca2+, for synaptic activity. However, extracellular Zn2+ is necessary for synaptic activity. The basal levels of extracellular zinc are age-dependently increased in the rat hippocampus, implying that the basal levels of extracellular Zn2+ are also increased age-dependently and that extracellular Zn2+ dynamics are linked with age-related cognitive function and dysfunction. In the hippocampus, the influx of extracellular Zn2+ into postsynaptic neurons, which is often linked with Zn2+ release from neuron terminals, is critical for cognitive activity via long-term potentiation (LTP). In contrast, the excess influx of extracellular Zn2+ into postsynaptic neurons induces cognitive decline. Interestingly, the excess influx of extracellular Zn2+ more readily occurs in aged dentate granule cells and intracellular Zn2+-buffering, which is assessed with ZnAF-2DA, is weakened in the aged dentate granule cells. Characteristics (easiness) of extracellular Zn2+ influx seem to be linked with the weakened intracellular Zn2+-buffering in the aged dentate gyrus. This paper deals with the impact of synaptic Zn2+ signaling on cognition and its decline in comparison with synaptic Ca2+ signaling.
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Affiliation(s)
- Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
| | - Hanuna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
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Takeda A, Tamano H, Murakami T, Nakada H, Minamino T, Koike Y. Weakened Intracellular Zn 2+-Buffering in the Aged Dentate Gyrus and Its Involvement in Erasure of Maintained LTP. Mol Neurobiol 2017; 55:3856-3865. [PMID: 28547527 DOI: 10.1007/s12035-017-0615-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 05/11/2017] [Indexed: 11/24/2022]
Abstract
Memory is lost by the increased influx of extracellular Zn2+ into neurons. It is possible that intracellular Zn2+ dynamics is modified even at non-zincergic medial perforant pathway-dentate granule cell synapses along with aging and that vulnerability to the modification is linked to age-related cognitive decline. To examine these possibilities, vulnerability of long-term potentiation (LTP) maintenance, which underlies memory retention, to modification of synaptic Zn2+ dynamics was compared between young and aged rats. The influx of extracellular Zn2+ into dentate granule cells was increased in aged rats after injection of high K+ into the dentate gyrus, but not in young rats. This increase impaired maintained LTP in aged rats. However, the impairment was rescued by co-injection of CaEDTA, an extracellular Zn2+ chelator, or CNQX, an AMPA receptor antagonist, which suppressed the Zn2+ influx. Maintained LTP was also impaired in aged rats after injection of ZnAF-2DA into the dentate gyrus that chelates intracellular Zn2+, but not in young rats. Interestingly, the capacity of chelating intracellular Zn2+ with intracellular ZnAF-2 was almost lost in the aged dentate gyrus 2 h after injection of ZnAF-2DA into the dentate gyrus, suggesting that intracellular Zn2+-buffering is weakened in the aged dentate gyrus, compared to the young dentate gyrus. In the dentate gyrus of aged rats, maintained LTP is more vulnerable to modification of intracellular Zn2+ dynamics than in young rats, probably due to weakened intracellular Zn2+-buffering.
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Affiliation(s)
- Atsushi Takeda
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan.
| | - Haruna Tamano
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Taku Murakami
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Hiroyuki Nakada
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Tatsuya Minamino
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Yuta Koike
- Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
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