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Mahadeva M, Niestępski S, Kowacz M. Dependence of cell's membrane potential on extracellular voltage observed in Chara globularis. Biophys Chem 2024; 307:107199. [PMID: 38335807 DOI: 10.1016/j.bpc.2024.107199] [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: 12/22/2023] [Revised: 01/31/2024] [Accepted: 02/04/2024] [Indexed: 02/12/2024]
Abstract
The membrane potential (Vm) of a cell results from the selective movement of ions across the cell membrane. Recent studies have revealed the presence of a gradient of voltage within a few nanometers adjacent to erythrocytes. Very notably this voltage is modified in response to changes in cell's membrane potential thus effectively extending the potential beyond the membrane and into the solution. In this study, using the microelectrode technique, we provide experimental evidence for the existence of a gradient of negative extracellular voltage (Vz) in a wide zone close to the cell wall of algal cells, extending over several micrometers. Modulating the ionic concentration of the extracellular solution with CO2 alters the extracellular voltage and causes an immediate change in Vm. Elevated extracellular CO2 levels depolarize the cell and hyperpolarize the zone of extracellular voltage (ZEV) by the same magnitude. This observation strongly suggests a coupling effect between Vz and Vm. An increase in the level of intracellular CO2 (dark respiration) leads to hyperpolarization of the cell without any immediate effect on the extracellular voltage. Therefore, the metabolic activity of a cell can proceed without inducing changes in Vz. Conversely, Vz can be modified by external stimulation without metabolic input from the cell. The evolution of the ZEV, particularly around spines and wounded cells, where ion exchange is enhanced, suggests that the formation of the ZEV may be attributed to the exchange of ions across the cell wall and cell membrane. By comparing the changes in Vm in response to external stimuli, as measured by electrodes and observed using a potential-sensitive dye, we provide experimental evidence demonstrating the significance of extracellular voltage in determining the cell's membrane potential. This may have implications for our understanding of cell membrane potential generation beyond the activities of ion channels.
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Affiliation(s)
- Manohara Mahadeva
- Department of Reproductive Immunology & Pathology, Institute of Animal Reproduction and Food Research Polish Academy of Sciences, 10-748 Olsztyn, Poland
| | - Sebastian Niestępski
- Department of Reproductive Immunology & Pathology, Institute of Animal Reproduction and Food Research Polish Academy of Sciences, 10-748 Olsztyn, Poland
| | - Magdalena Kowacz
- Department of Reproductive Immunology & Pathology, Institute of Animal Reproduction and Food Research Polish Academy of Sciences, 10-748 Olsztyn, Poland.
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2
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Ikemoto K, Mohamad Ishak NS, Akagawa M. The effects of pyrroloquinoline quinone disodium salt on brain function and physiological processes. THE JOURNAL OF MEDICAL INVESTIGATION 2024; 71:23-28. [PMID: 38735721 DOI: 10.2152/jmi.71.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
Pyrroloquinoline quinone disodium salt (PQQ) is a red trihydrate crystal that was approved as a new food ingredient by FDA in 2008. Now, it is approved as a food in Japan and the EU. PQQ has redox properties and exerts antioxidant, neuroprotective, and mitochondrial biogenesis effects. The baseline intake level of PQQ is considered to be 20 mg/day. PQQ ingestion lowers blood lipid peroxide levels in humans, suggesting antioxidant activity. In the field of cognitive function, double-blind, placebo-controlled trials have been conducted. Various improvements have been reported regarding general memory, verbal memory, working memory, and attention. Furthermore, a stratified analysis of a population with a wide range of ages revealed unique effects in young people (20-40 years old) that were not observed in older adults (41-65 years old). Specifically, cognitive flexibility and executive speed improved more rapidly in young people at 8 weeks. Co-administration of PQQ and coenzyme Q10 further enhanced these effects. In an open-label trial, PQQ was shown to improve sleep and mood. Additionally, PQQ was found to suppress skin moisture loss and increase PGC-1α expression. Overall, PQQ is a food with various functions, including brain health benefits. J. Med. Invest. 71 : 23-28, February, 2024.
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Affiliation(s)
- Kazuto Ikemoto
- Niigata Research Laboratory, Mitsubishi Gas Chemical Co, Inc., Niigata, Japan
| | | | - Mitsugu Akagawa
- Department of Food and Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
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3
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Bourque M, Morissette M, Soulet D, Di Paolo T. Impact of Sex on Neuroimmune contributions to Parkinson's disease. Brain Res Bull 2023:110668. [PMID: 37196734 DOI: 10.1016/j.brainresbull.2023.110668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 03/27/2023] [Accepted: 05/13/2023] [Indexed: 05/19/2023]
Abstract
Parkinson's disease (PD) is the second most common neurodegenerative disorder after Alzheimer's disease. Inflammation has been observed in both the idiopathic and familial forms of PD. Importantly, PD is reported more often in men than in women, men having at least 1.5- fold higher risk to develop PD than women. This review summarizes the impact of biological sex and sex hormones on the neuroimmune contributions to PD and its investigation in animal models of PD. Innate and peripheral immune systems participate in the brain neuroinflammation of PD patients and is reproduced in neurotoxin, genetic and alpha-synuclein based models of PD. Microglia and astrocytes are the main cells of the innate immune system in the central nervous system and are the first to react to restore homeostasis in the brain. Analysis of serum immunoprofiles in female and male control and PD patients show that a great proportion of these markers differ between male and female. The relationship between CSF inflammatory markers and PD clinical characteristics or PD biomarkers shows sex differences. Conversely, in animal models of PD, sex differences in inflammation are well documented and the beneficial effects of endogenous and exogenous estrogenic modulation in inflammation have been reported. Targeting neuroinflammation in PD is an emerging therapeutic option but gonadal drugs have not yet been investigated in this respect, thus offering new opportunities for sex specific treatments.
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Affiliation(s)
- Mélanie Bourque
- Centre de Recherche du CHU de Québec, Axe Neurosciences, 2705, Boulevard Laurier, Québec, (Québec), G1V4G2, Canada.
| | - Marc Morissette
- Centre de Recherche du CHU de Québec, Axe Neurosciences, 2705, Boulevard Laurier, Québec, (Québec), G1V4G2, Canada.
| | - Denis Soulet
- Centre de Recherche du CHU de Québec, Axe Neurosciences, 2705, Boulevard Laurier, Québec, (Québec), G1V4G2, Canada; Faculté de Pharmacie, Pavillon Ferdinand-Vandry, 1050, avenue de la Médecine, Université Laval, Québec (Québec) G1V 0A6, Canada.
| | - Thérèse Di Paolo
- Centre de Recherche du CHU de Québec, Axe Neurosciences, 2705, Boulevard Laurier, Québec, (Québec), G1V4G2, Canada; Faculté de Pharmacie, Pavillon Ferdinand-Vandry, 1050, avenue de la Médecine, Université Laval, Québec (Québec) G1V 0A6, Canada.
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4
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Li S, Raja A, Noroozifar M, Kerman K. Understanding the Inhibitory and Antioxidant Effects of Pyrroloquinoline Quinone (PQQ) on Copper(II)-Induced α-Synuclein-119 Aggregation. ACS Chem Neurosci 2022; 13:1178-1186. [PMID: 35413176 DOI: 10.1021/acschemneuro.1c00703] [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: 11/30/2022] Open
Abstract
Parkinson's disease (PD) is associated with the aggregation and misfolding of a-synuclein (a-syn) protein in dopaminergic neurons. The misfolding process is heavily linked to copper dysregulation in PD. Experimental evidence supports the hypothesis that the co-presence of Cu(II) and α-syn facilitates the aggregation of α-syn, affecting the pathological development of PD. Recent literature has shown that pyrroloquinoline quinone (PQQ) contains strong neuroprotective activity by reducing the reactive oxygen species (ROS) production by α-syn. Despite these known facts, minimal studies have been done on the antioxidant effect of PQQ against ROS formation in the presence of Cu(II) and α-syn-119. Thus, it is of great significance to study the interaction between all three components, PQQ, Cu(II), and α-syn-119. In this proof-of-concept study, a variety of chemical techniques were employed to examine the antioxidant effect of PQQ on ROS that α-syn-119 produced in the presence of Cu(II). Our results showed that PQQ effectively prevented ROS formation in SH-SY5Y human differentiated neuronal cells. Thioflavin T (ThT) fluorescence assay, circular dichroism (CD) spectroscopy, and transmission electron microscopy (TEM) were applied, where PQQ was able to actively prevent fibrillation of α-syn-119 in the presence of Cu(II). This finding was further confirmed using electrochemical impedance spectroscopy (EIS), where the binding of PQQ to the α-syn-119 suppressed the aggregation process on the electrode surface. With these encouraging results, we envisage that PQQ and its derivatives can be a promising candidate for further studies as a multitarget therapeutic agent toward PD therapy.
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Affiliation(s)
- ShaoPei Li
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
| | - Aruna Raja
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
| | - Meissam Noroozifar
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
| | - Kagan Kerman
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
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Ziaunys M, Sneideris T, Smirnovas V. Formation of distinct prion protein amyloid fibrils under identical experimental conditions. Sci Rep 2020; 10:4572. [PMID: 32165692 PMCID: PMC7067779 DOI: 10.1038/s41598-020-61663-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Accepted: 02/28/2020] [Indexed: 01/01/2023] Open
Abstract
Protein aggregation into amyloid fibrils is linked to multiple neurodegenerative disorders, such as Alzheimer’s, Parkinson’s or Creutzfeldt-Jakob disease. A better understanding of the way these aggregates form is vital for the development of drugs. A large detriment to amyloid research is the ability of amyloidogenic proteins to spontaneously aggregate into multiple structurally distinct fibrils (strains) with different stability and seeding properties. In this work we show that prion proteins are capable of forming more than one type of fibril under the exact same conditions by assessing their Thioflavin T (ThT) binding ability, morphology, secondary structure, stability and seeding potential.
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Affiliation(s)
- Mantas Ziaunys
- Institute of Biotechnology, Life Sciences Center, Vilnius University, Vilnius, Lithuania
| | - Tomas Sneideris
- Institute of Biotechnology, Life Sciences Center, Vilnius University, Vilnius, Lithuania
| | - Vytautas Smirnovas
- Institute of Biotechnology, Life Sciences Center, Vilnius University, Vilnius, Lithuania.
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Liu X, Li Z, Zhang C, Tan X, Yang X, Wan C, Lee DJ. Enhancement of anaerobic degradation of petroleum hydrocarbons by electron intermediate: Performance and mechanism. BIORESOURCE TECHNOLOGY 2020; 295:122305. [PMID: 31675520 DOI: 10.1016/j.biortech.2019.122305] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/16/2019] [Accepted: 10/18/2019] [Indexed: 06/10/2023]
Abstract
A quinone-respiring strain capable of degrading multitudinous petroleum hydrocarbons was isolated by selective medium and identified as Bacillus sp. (named as C8). Maximum 76.7% of total petroleum hydrocarbons (TPH) were degraded by the biosurfactant-mediated C8 with the aid of nitrate and electron intermediate (anthraquinone-2,6-disulphonate, AQDS). The quantitative real-time PCR results of several intracellular key functional genes suggested that AQDS could participate in the transformation of intermediates and accelerate the electron transfer in the degradation of TPH and nitrate, thereby eliminating the accumulation of nitrite and increasing the degradation efficiency of TPH. A strengthening mechanism, which promoted electron transport in the anaerobic denitrification degradation of petroleum hydrocarbons by quinone-respiring strain with the aid of electron intermediate, was proposed. The influencing factors were evaluated by using response surface methodology, and the TPH removal was positively related to temperature but negatively to pH.
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Affiliation(s)
- Xiang Liu
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Zhengwen Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Chen Zhang
- Shanghai Municipal Engineering Design General Institute, Shanghai 200092, China
| | - Xuejun Tan
- Shanghai Municipal Engineering Design General Institute, Shanghai 200092, China
| | - Xue Yang
- Shanghai Municipal Engineering Design General Institute, Shanghai 200092, China
| | - Chunli Wan
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China.
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
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Siegel D, Baca SM, Thompson DC, Huntsman MM, Mower MM, Ross D. The effect of anodal/cathodal biphasic electrical stimulation on insulin release. J Cell Physiol 2019; 234:16389-16399. [PMID: 30746686 DOI: 10.1002/jcp.28307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 01/03/2019] [Accepted: 01/10/2019] [Indexed: 01/24/2023]
Abstract
We studied the effects of electrical stimulation on insulin release from rat insulinoma (INS-1) cells. The anodal/cathodal biphasic stimulation (ACBPS) electrical waveform resulted in a voltage- and stimulation duration-dependent increase in insulin release. ACBPS elicited insulin release both in the presence and absence of glucose. Basal and ACBPS-induced insulin secretion could be inhibited by mitochondrial poisons and calcium channel blockers, indicating that insulin release was dependent on adenosine triphosphate (ATP) and the influx of calcium. ACBPS parameters that released insulin caused no detectable plasma membrane damage or cytotoxicity, although temporary morphological changes could be observed immediately after ACBPS. ACBPS did not alter the plasma membrane transmembrane potential but did cause pronounced uptake of MitoTracker Red into the mitochondrial membrane, indicating an increased mitochondrial membrane potential. While the ATP:ADP ratio after ACBPS did not change, the guanosine triphosphate (GTP) levels increased and increased GTP levels have previously been associated with insulin release in INS-1 cells. These results provide evidence that ACBPS can have significant biological effects on cells. In the case of INS-1 cells, ACBPS promotes insulin release without causing cytotoxicity.
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Affiliation(s)
- David Siegel
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Serapio M Baca
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, Colorado.,Department of Neurology, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - David C Thompson
- Department of Clinical Pharmacy, Skaggs School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Molly M Huntsman
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Morton M Mower
- School of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - David Ross
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, Colorado
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Javed H, Nagoor Meeran MF, Azimullah S, Adem A, Sadek B, Ojha SK. Plant Extracts and Phytochemicals Targeting α-Synuclein Aggregation in Parkinson's Disease Models. Front Pharmacol 2019; 9:1555. [PMID: 30941047 PMCID: PMC6433754 DOI: 10.3389/fphar.2018.01555] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 12/20/2018] [Indexed: 12/21/2022] Open
Abstract
α-Synuclein (α-syn) is a presynaptic protein that regulates the release of neurotransmitters from synaptic vesicles in the brain. α-Syn aggregates, including Lewy bodies, are features of both sporadic and familial forms of Parkinson's disease (PD). These aggregates undergo several key stages of fibrillation, oligomerization, and aggregation. Therapeutic benefits of drugs decline with disease progression and offer only symptomatic treatment. Novel therapeutic strategies are required which can either prevent or delay the progression of the disease. The link between α-syn and the etiopathogenesis and progression of PD are well-established in the literature. Studies indicate that α-syn is an important therapeutic target and inhibition of α-syn aggregation, oligomerization, and fibrillation are an important disease modification strategy. However, recent studies have shown that plant extracts and phytochemicals have neuroprotective effects on α-syn oligomerization and fibrillation by targeting different key stages of its formation. Although many reviews on the antioxidant-mediated, neuroprotective effect of plant extracts and phytochemicals on PD symptoms have been well-highlighted, the antioxidant mechanisms show limited success for translation to clinical studies. The identification of specific plant extracts and phytochemicals that target α-syn aggregation will provide selective molecules to develop new drugs for PD. The present review provides an overview of plant extracts and phytochemicals that target α-syn in PD and summarizes the observed effects and the underlying mechanisms. Furthermore, we provide a synopsis of current experimental models and techniques used to evaluate plant extracts and phytochemicals. Plant extracts and phytochemicals were found to inhibit the aggregation or fibril formation of oligomers. These also appear to direct α-syn oligomer formation into its unstructured form or promote non-toxic pathways and suggested to be valuable drug candidates for PD and related synucleinopathy. Current evidences from in vitro studies require confirmation in the in vivo studies. Further studies are needed to ascertain their potential effects and safety in preclinical studies for pharmaceutical/nutritional development of these phytochemicals or dietary inclusion of the plant extracts in PD treatment.
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Affiliation(s)
- Hayate Javed
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Mohamed Fizur Nagoor Meeran
- Department of Pharmacology and Therapeutics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Sheikh Azimullah
- Department of Pharmacology and Therapeutics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Abdu Adem
- Department of Pharmacology and Therapeutics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Bassem Sadek
- Department of Pharmacology and Therapeutics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Shreesh Kumar Ojha
- Department of Pharmacology and Therapeutics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
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Höllerhage M, Bickle M, Höglinger GU. Unbiased Screens for Modifiers of Alpha-Synuclein Toxicity. Curr Neurol Neurosci Rep 2019; 19:8. [PMID: 30739256 DOI: 10.1007/s11910-019-0925-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE OF REVIEW We provide an overview about unbiased screens to identify modifiers of alpha-synuclein (αSyn)-induced toxicity, present the models and the libraries that have been used for screening, and describe how hits from primary screens were selected and validated. RECENT FINDINGS Screens can be classified as either genetic or chemical compound modifier screens, but a few screens do not fit this classification. Most screens addressing αSyn-induced toxicity, including genome-wide overexpressing and deletion, were performed in yeast. More recently, newer methods such as CRISPR-Cas9 became available and were used for screening purposes. Paradoxically, given that αSyn-induced toxicity plays a role in neurological diseases, there is a shortage of human cell-based models for screening. Moreover, most screens used mutant or fluorescently tagged forms of αSyn and only very few screens investigated wild-type αSyn. Particularly, no genome-wide αSyn toxicity screen in human dopaminergic neurons has been published so far. Most unbiased screens for modifiers of αSyn toxicity were performed in yeast, and there is a lack of screens performed in human and particularly dopaminergic cells.
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Affiliation(s)
- Matthias Höllerhage
- Department of Translational Neurodegeneration, German Center for Neurodegenerative Diseases (DZNE), 81377, Munich, Germany
- Department of Neurology, Technical University of Munich (TUM), 81675, Munich, Germany
| | - Marc Bickle
- HT-Technology Development Studio, Max Planck Institute of Molecular Cell Biology and Genetics, 01307, Dresden, Germany
| | - Günter U Höglinger
- Department of Translational Neurodegeneration, German Center for Neurodegenerative Diseases (DZNE), 81377, Munich, Germany.
- Department of Neurology, Technical University of Munich (TUM), 81675, Munich, Germany.
- Munich Cluster for Systems Neurology (SyNergy), Ludwig Maximilians University (LMU), 81377, Munich, Germany.
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Tsukakoshi K, Yoshida W, Kobayashi M, Kobayashi N, Kim J, Kaku T, Iguchi T, Nagasawa K, Asano R, Ikebukuro K, Sode K. Esterification of PQQ Enhances Blood-Brain Barrier Permeability and Inhibitory Activity against Amyloidogenic Protein Fibril Formation. ACS Chem Neurosci 2018; 9:2898-2903. [PMID: 30074759 DOI: 10.1021/acschemneuro.8b00355] [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] [Indexed: 02/04/2023] Open
Abstract
Several neurodegenerative diseases have a common pathophysiology where selective damage to neurons results from the accumulation of amyloid oligomer proteins formed via fibrilization. Considering that the formation of amyloid oligomers leads to cytotoxicity, the development of chemical compounds that are able to effectively cross the blood-brain barrier (BBB) and inhibit this conversion to oligomers and/or fibrils is essential for neurodegenerative disease therapy. We previously reported that pyrroloquinoline quinone (PQQ) prevented aggregation and fibrillation of α-synuclein, amyloid β1-42 (Aβ1-42), and mouse prion protein. To develop a novel drug against neurodegenerative diseases based on PQQ, it is necessary to improve the insufficient BBB permeability of PQQ. Here, we show that an esterified compound of PQQ, PQQ-trimethylester (PQQ-TME), has twice the BBB permeability than PQQ in vitro. Moreover, PQQ-TME exhibited greater inhibitory activity against fibrillation of α-synuclein, Aβ1-42, and prion protein. These results indicated that esterification of PQQ could be a useful approach in developing a novel PQQ-based amyloid inhibitor.
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Affiliation(s)
- Kaori Tsukakoshi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Wataru Yoshida
- School of Bioscience and Biotechnology, Tokyo University of Technology, 1404-1 Katakuramachi, Hachioji, Tokyo 192-0982, Japan
| | - Masaki Kobayashi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Natsuki Kobayashi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Jihoon Kim
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Toshisuke Kaku
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Toshitsugu Iguchi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Kazuo Nagasawa
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Ryutaro Asano
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Kazunori Ikebukuro
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Koji Sode
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
- Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, North Carolina 27599, United States
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11
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Lin TS, Tsai HJ, Lee CH, Song YQ, Huang RS, Hsieh-Li HM, Liang MC, Lin Y. An Improved Drugs Screening System Reveals that Baicalein Ameliorates the Aβ/AMPA/NMDA-Induced Depolarization of Neurons. J Alzheimers Dis 2018; 56:959-976. [PMID: 28106556 DOI: 10.3233/jad-160898] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The presence of amyloid-β (Aβ) plaque and tau protein hyperphosphorylation in brain tissue is the pathological hallmark of Alzheimer's disease (AD). At least some Aβ neurotoxicity is caused by the presence of excess glutamate that has been induced by Aβ accumulation. Memantine is currently the only NMDA receptor inhibitor approved for treating moderate-to-severe AD patients. We utilized primary cortical neurons and DiBAC4(3), a slow-response voltage sensitive fluorescence dye, to create a novel system for screening herbal medicines that allows the identification of pure compounds able to ameliorate Aβ-induced abnormal depolarization. The intensity of DiBAC4(3) fluorescence was increased when primary neurons were stimulated by Aβ; furthermore, pre-treatment with memantine abolished this change. Using this system, we identified six crude extracts made from herbal medicines that effectively alleviated this Aβ-induced abnormal depolarization. Among these herbal medicines, one pure compound, baicalein, which was known to be present in Scutellaria baricalensis and is known to improve memory using an AD mouse model, was identified by our assay. However, the compound's molecular mechanism remained unknown. We found that baicalein, in addition to inhibiting Aβ-induced depolarization, possibly functions as an antagonist of AMPA and NMDA receptors. Taken together, we have established a system/platform to identify herbal medicines that ameliorate Aβ-induced depolarization of neurons. Equally important, baicalein is a candidate drug with great potential for the treatment of AD patients.
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Affiliation(s)
- Tian-Syuan Lin
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Han-Jung Tsai
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Chih-Han Lee
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Yan-Qing Song
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Rih-Sheng Huang
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Hsiu-Mei Hsieh-Li
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Mei-Chih Liang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Yenshou Lin
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
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12
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Bezine M, Debbabi M, Nury T, Ben-Khalifa R, Samadi M, Cherkaoui-Malki M, Vejux A, Raas Q, de Sèze J, Moreau T, El-Ayeb M, Lizard G. Evidence of K+ homeostasis disruption in cellular dysfunction triggered by 7-ketocholesterol, 24S-hydroxycholesterol, and tetracosanoic acid (C24:0) in 158N murine oligodendrocytes. Chem Phys Lipids 2017; 207:135-150. [DOI: 10.1016/j.chemphyslip.2017.03.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 03/06/2017] [Accepted: 03/07/2017] [Indexed: 12/12/2022]
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