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  1. Article ; Online: Two New Polymorphs in H50Q Determined by CryoEM Suggest a Mechanism That Explains Its Faster Kinetics In Vitro.

    Aguirre, Cesar / Ikenaka, Kensuke / Mochizuki, Hideki

    Movement disorders : official journal of the Movement Disorder Society

    2020  Volume 35, Issue 6, Page(s) 935–936

    MeSH term(s) Amyloid/metabolism ; Humans ; Kinetics ; alpha-Synuclein/genetics ; alpha-Synuclein/metabolism
    Chemical Substances Amyloid ; alpha-Synuclein
    Language English
    Publishing date 2020-05-29
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 607633-6
    ISSN 1531-8257 ; 0885-3185
    ISSN (online) 1531-8257
    ISSN 0885-3185
    DOI 10.1002/mds.28100
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Disaggregation Behavior of Amyloid β Fibrils by Anthocyanins Studied by Total-Internal-Reflection-Fluorescence Microscopy Coupled with a Wireless Quartz-Crystal Microbalance Biosensor.

    Noi, Kentaro / Ikenaka, Kensuke / Mochizuki, Hideki / Goto, Yuji / Ogi, Hirotsugu

    Analytical chemistry

    2021  Volume 93, Issue 32, Page(s) 11176–11183

    Abstract: Amyloid fibrils are formed from various proteins, some of which cause the corresponding neurodegenerative disorders, such as Alzheimer's and Parkinson's diseases. It has been reported that many compounds inhibit the formation of amyloid fibrils. ... ...

    Abstract Amyloid fibrils are formed from various proteins, some of which cause the corresponding neurodegenerative disorders, such as Alzheimer's and Parkinson's diseases. It has been reported that many compounds inhibit the formation of amyloid fibrils. Anthocyanins are flavonoid pigments present in fruits and vegetables, which are known to suppress symptoms related with Alzheimer's disease. However, the influence of anthocyanins on the amyloid fibril remains unclear. Here, we succeeded in the direct monitoring of the disaggregation reaction of single amyloid β (Aβ) fibrils by anthocyanins using total-internal-reflection-fluorescence microscopy with a quartz-crystal microbalance (TIRFM-QCM). It is found that the disassembly activity to the Aβ fibrils depends on the number of hydroxyl groups in six-membered ring B of anthocyanin, and only delphinidin-3-galactoside, possessing three hydroxyl groups there, shows high disassembly activity. Our results show the importance of the number of hydroxyl groups and demonstrate the usefulness of TIRFM-QCM as a powerful tool in studying interactions between amyloid fibrils and compounds.
    MeSH term(s) Amyloid ; Amyloid beta-Peptides ; Anthocyanins ; Biosensing Techniques ; Microscopy, Fluorescence ; Peptide Fragments ; Quartz
    Chemical Substances Amyloid ; Amyloid beta-Peptides ; Anthocyanins ; Peptide Fragments ; Quartz (14808-60-7)
    Language English
    Publishing date 2021-08-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.1c01720
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: [A case of sporadic amyotrophic lateral sclerosis (ALS) with Senataxin (SETX) gene variant].

    Beppu, Shohei / Ikenaka, Kensuke / Yabumoto, Taiki / Todo, Kenichi / Hashiguchi, Akihiro / Takashima, Hiroshi / Mochizuki, Hideki

    Rinsho shinkeigaku = Clinical neurology

    2022  Volume 62, Issue 3, Page(s) 205–210

    Abstract: A 67-year-old man presented slowly progressive weakness of the extremities visited our hospital. Nerve conduction study showed axonal neuropathy and needle electromyography showed neurogenic changes with denervation findings in multiple limb muscles. ... ...

    Abstract A 67-year-old man presented slowly progressive weakness of the extremities visited our hospital. Nerve conduction study showed axonal neuropathy and needle electromyography showed neurogenic changes with denervation findings in multiple limb muscles. While he was diagnosed as Probable amyotrophic lateral sclerosis (ALS), which is defined by the Awaji criteria for diagnosis of ALS, he did not develop either respiratory muscle paralysis or bulbar palsy, which are characteristic symptoms of sporadic ALS. Genetic testing revealed a novel gene variant in senataxin (SETX), the causative gene of ALS4. We could not make a definite diagnosis of ALS4 because he had no relatives who could perform genetic testing (segregation study). However, we considered the variant can be pathogenic because it was not previously reported and absent in at least 1,000 healthy control individuals, the variant site was highly conserved in mammals, and it may impair the function of senataxin protein (in silico analysis).
    MeSH term(s) Aged ; Amyotrophic Lateral Sclerosis/diagnosis ; Amyotrophic Lateral Sclerosis/genetics ; Bulbar Palsy, Progressive ; DNA Helicases/genetics ; Electromyography ; Humans ; Male ; Multifunctional Enzymes/genetics ; Muscle, Skeletal/pathology ; RNA Helicases/genetics
    Chemical Substances Multifunctional Enzymes ; SETX protein, human (EC 3.6.1.-) ; DNA Helicases (EC 3.6.4.-) ; RNA Helicases (EC 3.6.4.13)
    Language Japanese
    Publishing date 2022-03-25
    Publishing country Japan
    Document type Case Reports ; Journal Article
    ZDB-ID 604200-4
    ISSN 1882-0654 ; 0009-918X
    ISSN (online) 1882-0654
    ISSN 0009-918X
    DOI 10.5692/clinicalneurol.cn-001675
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ultrastiff Amyloid-Fibril Network of α-Synuclein Formed by Surface Seeding Reaction Confirmed by Multichannel Electrodeless Quartz-Crystal-Microbalance Biosensor.

    Zhou, Lianjie / Hajiri, Touko / Nakajima, Kichitaro / Aguirre, César / Ikenaka, Kensuke / Mochizuki, Hideki / Yamaguchi, Keiichi / Goto, Yuji / Ogi, Hirotsugu

    ACS sensors

    2023  Volume 8, Issue 7, Page(s) 2598–2608

    Abstract: We developed a multichannel wireless quartz-crystal-microbalance (QCM) biosensor for mechanically studying the on-surface aggregation reaction of α-synuclein (α-syn). We find a quite unusual change in the resonant frequency that eventually exceeds the ... ...

    Abstract We developed a multichannel wireless quartz-crystal-microbalance (QCM) biosensor for mechanically studying the on-surface aggregation reaction of α-synuclein (α-syn). We find a quite unusual change in the resonant frequency that eventually exceeds the baseline, which has never been observed during seeding aggregation reaction. By incorporating a growth-to-percolation theory for fibril elongation reaction, we have favorably reproduced this unusual response and found that it can be explained only with formation of an ultrastiff fibril network. We also find that the stiffness of the fibril network grown from artificially prepared twist-type seeds is significantly higher than that from rod-type seeds. Furthermore, the stiffnesses of fibril networks grown from seeds derived from brain tissues of Parkinson's disease (PD) and multiple system atrophy (MSA) patients show a very similar trend to those of rod and twist seeds, respectively, indicating that fibrils from MSA patients are stiffer than those from PD.
    MeSH term(s) Humans ; alpha-Synuclein ; Quartz ; Parkinson Disease ; Amyloid ; Biosensing Techniques
    Chemical Substances alpha-Synuclein ; Quartz (14808-60-7) ; Amyloid
    Language English
    Publishing date 2023-06-26
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2379-3694
    ISSN (online) 2379-3694
    DOI 10.1021/acssensors.3c00331
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Neuronal MML-1/MXL-2 regulates systemic aging via glutamate transporter and cell nonautonomous autophagic and peroxidase activity.

    Shioda, Tatsuya / Takahashi, Ittetsu / Ikenaka, Kensuke / Fujita, Naonobu / Kanki, Tomotake / Oka, Toshihiko / Mochizuki, Hideki / Antebi, Adam / Yoshimori, Tamotsu / Nakamura, Shuhei

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 39, Page(s) e2221553120

    Abstract: Accumulating evidence has demonstrated the presence of intertissue-communication regulating systemic aging, but the underlying molecular network has not been fully explored. We and others previously showed that two basic helix-loop-helix transcription ... ...

    Abstract Accumulating evidence has demonstrated the presence of intertissue-communication regulating systemic aging, but the underlying molecular network has not been fully explored. We and others previously showed that two basic helix-loop-helix transcription factors, MML-1 and HLH-30, are required for lifespan extension in several longevity paradigms, including germlineless
    MeSH term(s) Animals ; Aging/genetics ; Amino Acid Transport System X-AG ; Autophagy/genetics ; Caenorhabditis elegans/genetics ; Neurons ; Peroxidases ; Caenorhabditis elegans Proteins/genetics
    Chemical Substances Amino Acid Transport System X-AG ; Peroxidases (EC 1.11.1.-) ; MML-1 protein, C elegans ; MXL-2 protein, C elegans ; Caenorhabditis elegans Proteins
    Language English
    Publishing date 2023-09-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2221553120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Disaggregation Behavior of Amyloid β Fibrils by Anthocyanins Studied by Total-Internal-Reflection-Fluorescence Microscopy Coupled with a Wireless Quartz-Crystal Microbalance Biosensor

    Noi, Kentaro / Ikenaka, Kensuke / Mochizuki, Hideki / Goto, Yuji / Ogi, Hirotsugu

    Analytical chemistry. 2021 Aug. 05, v. 93, no. 32

    2021  

    Abstract: Amyloid fibrils are formed from various proteins, some of which cause the corresponding neurodegenerative disorders, such as Alzheimer’s and Parkinson’s diseases. It has been reported that many compounds inhibit the formation of amyloid fibrils. ... ...

    Abstract Amyloid fibrils are formed from various proteins, some of which cause the corresponding neurodegenerative disorders, such as Alzheimer’s and Parkinson’s diseases. It has been reported that many compounds inhibit the formation of amyloid fibrils. Anthocyanins are flavonoid pigments present in fruits and vegetables, which are known to suppress symptoms related with Alzheimer’s disease. However, the influence of anthocyanins on the amyloid fibril remains unclear. Here, we succeeded in the direct monitoring of the disaggregation reaction of single amyloid β (Aβ) fibrils by anthocyanins using total-internal-reflection-fluorescence microscopy with a quartz-crystal microbalance (TIRFM-QCM). It is found that the disassembly activity to the Aβ fibrils depends on the number of hydroxyl groups in six-membered ring B of anthocyanin, and only delphinidin-3-galactoside, possessing three hydroxyl groups there, shows high disassembly activity. Our results show the importance of the number of hydroxyl groups and demonstrate the usefulness of TIRFM-QCM as a powerful tool in studying interactions between amyloid fibrils and compounds.
    Keywords amyloid ; analytical chemistry ; anthocyanins ; biosensors ; microscopy ; quartz crystal microbalance
    Language English
    Dates of publication 2021-0805
    Size p. 11176-11183.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.1c01720
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Lipids as

    Ikenaka, Kensuke / Suzuki, Mari / Mochizuki, Hideki / Nagai, Yoshitaka

    Frontiers in neuroscience

    2019  Volume 13, Page(s) 693

    Abstract: Aggregation of α-synuclein (αSyn) plays a central role in the pathogenesis of Parkinson's disease (PD) and dementia with Lewy bodies (DLB). Lewy bodies (LBs) and Lewy neurites, which consist mainly of aggregated αSyn, are widely observed in the affected ... ...

    Abstract Aggregation of α-synuclein (αSyn) plays a central role in the pathogenesis of Parkinson's disease (PD) and dementia with Lewy bodies (DLB). Lewy bodies (LBs) and Lewy neurites, which consist mainly of aggregated αSyn, are widely observed in the affected regions of patient brains. Except for some familial forms of PD/DLB, most sporadic PD/DLB patients express the wild-type (WT) αSyn protein without any mutations, and the mechanisms as to how WT αSyn gains the propensity to pathologically aggregate still remains unclear. Furthermore, the mechanisms by which the same αSyn protein can cause different synucleinopathies with distinct phenotypes and pathologies, such as PD, DLB, and multiple system atrophy (MSA), still remain largely unknown. Recently, mutations in the
    Language English
    Publishing date 2019-07-03
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2411902-7
    ISSN 1662-453X ; 1662-4548
    ISSN (online) 1662-453X
    ISSN 1662-4548
    DOI 10.3389/fnins.2019.00693
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Decreased hepatic enzymes reflect the decreased vitamin B6 levels in Parkinson's disease patients.

    Ikenaka, Kensuke / Kajiyama, Yuta / Aguirre, César / Choong, Chi-Jing / Taniguchi, Seira / Doi, Junko / Wang, Nan / Ajiki, Takahiro / Ogawa, Kotaro / Kakuda, Keita / Kimura, Yasuyoshi / Mochizuki, Hideki

    Pharmacology research & perspectives

    2024  Volume 12, Issue 1, Page(s) e1174

    Abstract: The study aims to investigate the vitamin B6 levels in Parkinson's disease (PD) patients and their association with liver enzymes and evaluate how much dysregulation is associated with levodopa dose. Furthermore, to evaluate the effect of Opicapone, a ... ...

    Abstract The study aims to investigate the vitamin B6 levels in Parkinson's disease (PD) patients and their association with liver enzymes and evaluate how much dysregulation is associated with levodopa dose. Furthermore, to evaluate the effect of Opicapone, a catechol-o-methyl-transferase inhibitor, on vitamin B6 levels by monitoring the AST and ALT levels in patients treated with Levodopa-Carbidopa Intestinal Gel Infusion (LCIG). For these aims, serum vitamin B6 levels were measured (PD, n = 72 and controls, n = 31). The vitamin B6 level was compared with the total levodopa dose, clinical parameters, and blood homocysteine, albumin, and hemoglobin levels in PD patients. Correlations between vitamin B6 levels and AST and ALT levels, as well as the ratio ALT/AST, were analyzed. Changes in the AST and ALT levels and ALT/AST were analyzed in the patients treated with LCIG before and after the therapy (n = 24) and in the patients treated with LCIG + Opicapone before and after Opicapone treatment (n = 12). We found vitamin B6 levels were significantly lower in PD patients. Total levodopa dose and albumin levels were independently associated with vitamin B6 levels. Decreased vitamin B6 levels appeared as lower AST and ALT levels and ALT/AS. Treatment with LCIG decreased the AST and ALT levels and ALT/AST. Adjunctive therapy with Opicapone to LCIG ameliorated the decreased ALT and ALT/AST. We conclude that the ALT and ALT/AST can be useful parameters for monitoring vitamin B6 levels and Opicapone can ameliorate the dysregulated vitamin B6 in PD patients.
    MeSH term(s) Humans ; Parkinson Disease/drug therapy ; Levodopa/therapeutic use ; Levodopa/adverse effects ; Antiparkinson Agents/pharmacology ; Antiparkinson Agents/therapeutic use ; Vitamin B 6/therapeutic use ; Albumins/therapeutic use
    Chemical Substances Levodopa (46627O600J) ; Antiparkinson Agents ; Vitamin B 6 (8059-24-3) ; Albumins
    Language English
    Publishing date 2024-01-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2740389-0
    ISSN 2052-1707 ; 2052-1707
    ISSN (online) 2052-1707
    ISSN 2052-1707
    DOI 10.1002/prp2.1174
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: The validation of a Japanese version of the New Freezing of Gait Questionnaire (NFOG-Q).

    Taniguchi, Seira / Marumoto, Kohei / Kajiyama, Yuta / Revankar, Gajanan / Inoue, Michiko / Yamamoto, Hiroshi / Kayano, Rika / Mizuta, Eiji / Takahashi, Ryuichi / Shirahata, Emi / Saeki, Chizu / Ozono, Tatsuhiko / Kimura, Yasuyoshi / Ikenaka, Kensuke / Mochizuki, Hideki

    Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology

    2024  

    Abstract: Objective: This study aimed to develop a Japanese version of the New Freezing of Gait Questionnaire (NFOG-Q) and investigate its validity and reliability.: Methods: After translating the NFOG-Q according to a standardised protocol, 56 patients with ... ...

    Abstract Objective: This study aimed to develop a Japanese version of the New Freezing of Gait Questionnaire (NFOG-Q) and investigate its validity and reliability.
    Methods: After translating the NFOG-Q according to a standardised protocol, 56 patients with Parkinson's disease (PD) were administered it. Additionally, the MDS-UPDRS parts II and III, Hoehn and Yahr (H&Y) stage, and number of falls over 1 month were evaluated. Spearman's correlation coefficients (rho) were used to determine construct validity, and Cronbach's alpha (α) was used to examine reliability.
    Results: The interquartile range of the NFOG-Q scores was 10.0-25.3 (range 0-29). The NFOG-Q scores were strongly correlated with the MDS-UPDRS part II, items 2.12 (walking and balance), 2.13 (freezing), 3.11 (freezing of gait), and 3.12 (postural stability) and the postural instability and gait difficulty score (rho = 0.515-0.669), but only moderately related to the MDS-UPDRS item 3.10 (gait), number of falls, disease duration, H&Y stage, and time of the Timed Up-and-Go test (rho = 0.319-0.434). No significant correlations were observed between age and the time of the 10-m walk test. The internal consistency was excellent (α = 0.96).
    Conclusions: The Japanese version of the NFOG-Q is a valid and reliable tool for assessing the severity of freezing in patients with PD.
    Language English
    Publishing date 2024-02-22
    Publishing country Italy
    Document type Journal Article
    ZDB-ID 2016546-8
    ISSN 1590-3478 ; 1590-1874
    ISSN (online) 1590-3478
    ISSN 1590-1874
    DOI 10.1007/s10072-024-07405-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Strong acids induce amyloid fibril formation of β

    Yamaguchi, Keiichi / Hasuo, Kenshiro / So, Masatomo / Ikenaka, Kensuke / Mochizuki, Hideki / Goto, Yuji

    The Journal of biological chemistry

    2021  Volume 297, Issue 5, Page(s) 101286

    Abstract: Amyloid fibrils, crystal-like fibrillar aggregates of proteins associated with various amyloidoses, have the potential to propagate via a prion-like mechanism. Among known methodologies to dissolve preformed amyloid fibrils, acid treatment has been used ... ...

    Abstract Amyloid fibrils, crystal-like fibrillar aggregates of proteins associated with various amyloidoses, have the potential to propagate via a prion-like mechanism. Among known methodologies to dissolve preformed amyloid fibrils, acid treatment has been used with the expectation that the acids will degrade amyloid fibrils similar to acid inactivation of protein functions. Contrary to our expectation, treatment with strong acids, such as HCl or H
    MeSH term(s) Amyloid/chemistry ; Anions/chemistry ; Circular Dichroism ; Humans ; Hydrogen-Ion Concentration ; Protein Aggregates ; Sodium Chloride/chemistry ; beta 2-Microglobulin/chemistry
    Chemical Substances Amyloid ; Anions ; B2M protein, human ; Protein Aggregates ; beta 2-Microglobulin ; Sodium Chloride (451W47IQ8X)
    Language English
    Publishing date 2021-10-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1016/j.jbc.2021.101286
    Database MEDical Literature Analysis and Retrieval System OnLINE

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