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  1. AU="Ishibashi, Kenji"
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  1. Article ; Online: Clinical application of MAO-B PET using

    Ishibashi, Kenji

    Geriatrics & gerontology international

    2023  Volume 24 Suppl 1, Page(s) 31–43

    Abstract: Monoamine oxidase B (MAO-B) is an enzyme localized to the outer mitochondrial membrane and highly concentrated in astrocytes. Temporal changes in regional MAO-B levels can be used as an index of astrocytic proliferation, known as activated astrocytes or ... ...

    Abstract Monoamine oxidase B (MAO-B) is an enzyme localized to the outer mitochondrial membrane and highly concentrated in astrocytes. Temporal changes in regional MAO-B levels can be used as an index of astrocytic proliferation, known as activated astrocytes or astrogliosis. MAO-B is a marker to evaluate the degree of astrogliosis. Therefore, MAO-B positron emission tomography (PET) is a powerful imaging technique for visualizing and quantifying ongoing astrogliosis through the estimate of regional MAO-B levels. Each neurodegenerative disorder generally has a characteristic distribution pattern of astrogliosis secondary to neuronal loss and pathological protein aggregation. Therefore, by imaging astrogliosis, MAO-B PET can be used as a neurodegeneration marker for identifying degenerative lesions. Any inflammation in the brain usually accompanies astrogliosis starting from an acute phase to a chronic phase. Therefore, by imaging astrogliosis, MAO-B PET can be used as a neuroinflammation marker for identifying inflammatory lesions. MAO-B levels are high in gliomas originating from astrocytes but low in lymphoid tumors. Therefore, MAO-B PET can be used as a brain tumor marker for identifying astrocytic gliomas by imaging MAO-B levels and distinguishing between astrocytic and lymphoid tumors. This review summarizes the clinical application of MAO-B PET using
    MeSH term(s) Humans ; Monoamine Oxidase/metabolism ; Gliosis/metabolism ; Gliosis/pathology ; Neuroinflammatory Diseases ; Positron-Emission Tomography ; Nervous System Diseases/metabolism ; Nervous System Diseases/pathology ; Brain/metabolism ; Neoplasms ; Aminopyridines ; Quinolines
    Chemical Substances Monoamine Oxidase (EC 1.4.3.4) ; THK5351 ; Aminopyridines ; Quinolines
    Language English
    Publishing date 2023-11-16
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 2113849-7
    ISSN 1447-0594 ; 1444-1586
    ISSN (online) 1447-0594
    ISSN 1444-1586
    DOI 10.1111/ggi.14729
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Pitfalls of Amyloid-Beta PET: Comparisons With 18 F-MK-6240 and 18 F-THK5351 PET.

    Ishibashi, Kenji / Kurihara, Masanori / Toyohara, Jun / Ishii, Kenji / Iwata, Atsushi

    Clinical nuclear medicine

    2024  Volume 49, Issue 4, Page(s) 319–321

    Abstract: Abstract: We present 3 patients as pitfalls of amyloid-beta (Aβ) PET, who underwent 11 C-PiB (Aβ), 18 F-MK-6240 (Alzheimer disease [AD]-tau), and 18 F-THK5351 (astrogliosis) PET examinations. Despite negligible or tiny Aβ pathology, patients 1 and 2 ... ...

    Abstract Abstract: We present 3 patients as pitfalls of amyloid-beta (Aβ) PET, who underwent 11 C-PiB (Aβ), 18 F-MK-6240 (Alzheimer disease [AD]-tau), and 18 F-THK5351 (astrogliosis) PET examinations. Despite negligible or tiny Aβ pathology, patients 1 and 2 were diagnosed with AD as the cause of symptoms. Despite widespread Aβ pathology, patient 3 was not diagnosed with AD as the cause of symptoms. However, if we had only conducted Aβ PET, patients 1 and 2 might not have been diagnosed with AD, whereas patient 3 might have been diagnosed with AD. Hence, both Aβ and AD-tau assessments are necessary to relate clinical symptoms to AD pathology.
    MeSH term(s) Humans ; Amyloid beta-Peptides ; Alzheimer Disease/diagnostic imaging ; Aminopyridines ; Isoquinolines ; Quinolines
    Chemical Substances MK-6240 ; THK5351 ; Amyloid beta-Peptides ; Aminopyridines ; Isoquinolines ; Quinolines
    Language English
    Publishing date 2024-02-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 197628-x
    ISSN 1536-0229 ; 0363-9762
    ISSN (online) 1536-0229
    ISSN 0363-9762
    DOI 10.1097/RLU.0000000000005097
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Diagnostic performance of the cingulate island sign ratio for differentiating dementia with Lewy bodies from Alzheimer's disease changes depending on the mini-mental state examination score.

    Asahara, Yuki / Kameyama, Masashi / Ishii, Kenji / Ishibashi, Kenji

    Journal of the neurological sciences

    2023  Volume 455, Page(s) 122782

    Abstract: Background: The cingulate island sign (CIS) ratio is a diagnostic adjunct for differentiating dementia with Lewy bodies (DLB) from Alzheimer's disease (AD). A recent study showed that the CIS ratio in DLB changed depending on the Mini-Mental State ... ...

    Abstract Background: The cingulate island sign (CIS) ratio is a diagnostic adjunct for differentiating dementia with Lewy bodies (DLB) from Alzheimer's disease (AD). A recent study showed that the CIS ratio in DLB changed depending on the Mini-Mental State Examination (MMSE) score. We aimed to evaluate whether the diagnostic performance (sensitivity and specificity) of the CIS ratio for differentiating DLB from AD changes depending on the MMSE score.
    Methods: Twenty-two patients with DLB and 26 amyloid-positive patients with AD, who underwent
    Results: Within Group B, the CIS ratio in DLB was significantly higher than that in AD (p = 0.0005), but not within Groups A (p = 0.5117) and C (p = 0.8671). ROC curve analyses showed that the sensitivities and specificities of the CIS ratio for differentiating DLB from AD were 66.7% and 77.8% in Group A, 91.7% and 100.0% in Group B, and 75.0% and 66.7% in Group C, respectively.
    Conclusions: The present study suggests that the diagnostic performance of the CIS ratio for differentiating DLB from AD changes depending on the MMSE score, with higher sensitivity and specificity at MMSE scores of 20-24.
    MeSH term(s) Humans ; Alzheimer Disease/diagnostic imaging ; Lewy Body Disease/diagnostic imaging ; Sensitivity and Specificity ; ROC Curve ; Fluorodeoxyglucose F18 ; Diagnosis, Differential
    Chemical Substances Fluorodeoxyglucose F18 (0Z5B2CJX4D)
    Language English
    Publishing date 2023-11-09
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80160-4
    ISSN 1878-5883 ; 0022-510X ; 0374-8642
    ISSN (online) 1878-5883
    ISSN 0022-510X ; 0374-8642
    DOI 10.1016/j.jns.2023.122782
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Clinical Application of 18F-THK5351 PET to Identify Inflammatory Lesions Through Imaging Astrogliosis in a Case of Cytomegalovirus Ventriculoencephalitis.

    Hatano, Keiko / Ishibashi, Kenji / Yamada, Kazuki / Ishii, Kenji / Iwata, Atsushi

    Clinical nuclear medicine

    2023  Volume 48, Issue 10, Page(s) e489–e490

    Abstract: Abstract: 18F-THK5351 PET is used to estimate the degree of astrogliosis. Because inflammatory lesions usually accompany astrogliosis, 18F-THK5351 PET is potentially worthy of clinical application in inflammatory disorders. Here, we report a case of ... ...

    Abstract Abstract: 18F-THK5351 PET is used to estimate the degree of astrogliosis. Because inflammatory lesions usually accompany astrogliosis, 18F-THK5351 PET is potentially worthy of clinical application in inflammatory disorders. Here, we report a case of cytomegalovirus ventriculoencephalitis in an immunocompromised 75-year-old woman who underwent 18F-THK5351 PET and conventional neuroimaging modalities, including 11C-methionine, 18F-FDG, and MRI. 18F-THK5351 PET was clearly superior to the other modalities in identifying inflammatory lesions and can therefore be a useful marker for identifying inflammatory lesions through imaging astrogliosis. This feature of 18F-THK5351 may contribute to the early diagnosis of cytomegalovirus ventriculoencephalitis.
    MeSH term(s) Female ; Humans ; Aged ; Gliosis ; Cytomegalovirus ; Aminopyridines ; Positron-Emission Tomography
    Chemical Substances THK5351 ; Aminopyridines
    Language English
    Publishing date 2023-08-30
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 197628-x
    ISSN 1536-0229 ; 0363-9762
    ISSN (online) 1536-0229
    ISSN 0363-9762
    DOI 10.1097/RLU.0000000000004809
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: 18 F-THK5351 PET Can Evaluate Tumor Extension in Intravascular Large B-Cell Lymphoma : Comparison With 11C-Methionine PET and 18F-FDG PET.

    Hatano, Keiko / Ishibashi, Kenji / Kondo, Soichiro / Ishii, Kenji / Iwata, Atsushi

    Clinical nuclear medicine

    2023  Volume 48, Issue 4, Page(s) e204–e206

    Abstract: Abstract: A 79-year-old man presenting with gait disturbance and cognitive decline was diagnosed with intravascular large B-cell lymphoma (IVLBCL) by random skin biopsy. Some IVLBCL lesions were identified by PET examinations using 11 C-methionine, 18 F- ...

    Abstract Abstract: A 79-year-old man presenting with gait disturbance and cognitive decline was diagnosed with intravascular large B-cell lymphoma (IVLBCL) by random skin biopsy. Some IVLBCL lesions were identified by PET examinations using 11 C-methionine, 18 F-FDG, and 18 F-THK5351. 11 C-methionine and 18 F-FDG uptake, which likely reflects the presence of the lymphoma cells themselves, increased clearly in the left putamen but weakly in the left deep white matter. 18 F-THK5351 uptake increased in all lesions, likely reflecting perivascular astrogliosis caused by IVLBCL. Hence, 18 F-THK5351 PET can evaluate tumor extension in IVLBCL lesions where 11 C-methionine and 18 F-FDG PET may fail in its visualization.
    MeSH term(s) Male ; Humans ; Aged ; Fluorodeoxyglucose F18 ; Carbon Radioisotopes ; Radiopharmaceuticals ; Positron-Emission Tomography ; Methionine ; Lymphoma, Large B-Cell, Diffuse
    Chemical Substances Fluorodeoxyglucose F18 (0Z5B2CJX4D) ; THK5351 ; Carbon-11 ; Carbon Radioisotopes ; Radiopharmaceuticals ; carbon-11 methionine (58576-49-1) ; Methionine (AE28F7PNPL)
    Language English
    Publishing date 2023-01-20
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 197628-x
    ISSN 1536-0229 ; 0363-9762
    ISSN (online) 1536-0229
    ISSN 0363-9762
    DOI 10.1097/RLU.0000000000004568
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: A Novel Proposal for an Index for Regional Cerebral Perfusion Pressure - A Theoretical Approach Using Fluid Dynamics.

    Kameyama, Masashi / Momose, Toshimitsu / Ishibashi, Kenji / Ishii, Kenji

    Frontiers in neurology

    2022  Volume 12, Page(s) 765463

    Abstract: Cerebral blood flow (CBF) / cerebral blood volume (CBV) ratio derived by [ ...

    Abstract Cerebral blood flow (CBF) / cerebral blood volume (CBV) ratio derived by [
    Language English
    Publishing date 2022-01-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2564214-5
    ISSN 1664-2295
    ISSN 1664-2295
    DOI 10.3389/fneur.2021.765463
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Detailed Assessment of 18F-THK5351 Distribution Pattern in the Midbrain: Comparison With Progressive Supranuclear Palsy and Corticobasal Syndrome.

    Ishibashi, Kenji / Kurihara, Masanori / Ihara, Ryoko / Higashihara, Mana / Iwata, Atsushi / Ishii, Kenji

    Clinical nuclear medicine

    2023  Volume 48, Issue 10, Page(s) 841–846

    Abstract: Background: 18F-THK5351 PET is used to image ongoing astrogliosis by estimating monoamine oxidase B levels. 18F-THK5351 preferentially accumulates around the substantia nigra (SN) and periaqueductal gray (PG) in the midbrain under healthy conditions and ...

    Abstract Background: 18F-THK5351 PET is used to image ongoing astrogliosis by estimating monoamine oxidase B levels. 18F-THK5351 preferentially accumulates around the substantia nigra (SN) and periaqueductal gray (PG) in the midbrain under healthy conditions and exhibits a "trimodal pattern." In progressive supranuclear palsy (PSP) and corticobasal syndrome (CBS), the midbrain 18F-THK5351 uptake can be increased by astrogliosis, collapsing the "trimodal pattern." We aimed to elucidate cases in which the "trimodal pattern" collapses in PSP and CBS.
    Patients and methods: Participants in the PSP (n = 11), CBS (n = 17), Alzheimer disease (n = 11), and healthy control (n = 8) groups underwent 18F-THK5351 PET. Volumes of interest (VOIs) were placed on the SN, PG, and their midpoints. The midbrain uptake ratio (MUR) was calculated to assess the trimodal pattern as follows: MUR = (VOI value on the midpoint)/(VOI value on the SN and PG). Approximately, the trimodal pattern can be identified at MUR <1 but not at MUR >1.
    Results: Compared with the healthy control group, MUR significantly increased in the PSP (P < 0.01) and CBS (P < 0.01) groups, but was unchanged in the Alzheimer disease group (P = 0.10). In the PSP group, all patients, including 2 with mild symptoms and a short disease duration, showed MUR >1. In the CBS group, MUR varied widely.
    Conclusions: In PSP, the trimodal pattern can collapse even in the early phase when symptoms are mild. In CBS, the trimodal pattern may or may not collapse depending on the underlying pathology.
    MeSH term(s) Humans ; Supranuclear Palsy, Progressive/diagnostic imaging ; Alzheimer Disease ; Corticobasal Degeneration ; Gliosis ; Mesencephalon/diagnostic imaging
    Chemical Substances THK5351
    Language English
    Publishing date 2023-09-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 197628-x
    ISSN 1536-0229 ; 0363-9762
    ISSN (online) 1536-0229
    ISSN 0363-9762
    DOI 10.1097/RLU.0000000000004815
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Ventral Variant Posterior Cortical Atrophy with Occipito-temporal Accumulation of Tau Proteins/Astrocyte Gliosis.

    Shiio, Mihoko / Maeda, Nobuya / Iwata, Atsushi / Ishibashi, Kenji / Ishii, Kenji / Takuma, Hiroshi / Ishizaka, Yuko / Sakurai, Yasuhisa

    Internal medicine (Tokyo, Japan)

    2024  

    Abstract: A 73-year-old woman with posterior cortical atrophy (PCA) presented with progressive apperceptive visual agnosia, alexia, agraphia, ventral simultanagnosia, prosopagnosia, and allocentric (stimulus-centered) left-sided hemispatial neglect. All of these ... ...

    Abstract A 73-year-old woman with posterior cortical atrophy (PCA) presented with progressive apperceptive visual agnosia, alexia, agraphia, ventral simultanagnosia, prosopagnosia, and allocentric (stimulus-centered) left-sided hemispatial neglect. All of these symptoms were attributed to damage to the bilateral occipito-temporal cortices, consistent with ventral variant PCA. While the Pittsburgh compound B uptake was extensively distributed throughout the occipito-parietal (dorsal) and occipito-temporal (ventral) areas, the THK5351 (ligand binding to tau aggregates/astrocyte gliosis) accumulation was limited to the ventral area. These findings suggest that local accumulation of tau proteins and/or astrocyte gliosis over the occipito-temporal cortices can result in ventral variant PCA.
    Language English
    Publishing date 2024-02-19
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 32371-8
    ISSN 1349-7235 ; 0021-5120 ; 0918-2918
    ISSN (online) 1349-7235
    ISSN 0021-5120 ; 0918-2918
    DOI 10.2169/internalmedicine.2844-23
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: [Cross-validation of Quantitative Analytical Software Using 18F-florbetapir PET Imaging].

    Wagatsuma, Kei / Miwa, Kenta / Sakata, Muneyuki / Ishibashi, Kenji / Ishii, Kenji

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2021  Volume 77, Issue 1, Page(s) 32–40

    Abstract: Background: 18: Methods: We injected 40 individuals with : Results: A cSUVR>1.10 was determined by Amygo neuro and MIMneuro in 15 of the 40 individuals. The rSUVR in the posterior cingulate, parietal lobe, precuneus, and temporal lobe ... ...

    Abstract Background: 18
    Methods: We injected 40 individuals with
    Results: A cSUVR>1.10 was determined by Amygo neuro and MIMneuro in 15 of the 40 individuals. The rSUVR in the posterior cingulate, parietal lobe, precuneus, and temporal lobe significantly differed between Amygo neuro and MIMneuro, whereas the cSUVR did not. The SUVR calculated by the two types of software closely correlated to each other (R=0.89-0.96, P<0.05).
    Conclusions: The cSUVR was not different between Amygo neuro and MIMneuro. We suggest that Amygo neuro is comparable to MIMneuro in quantitative analysis using SUVR for
    MeSH term(s) Alzheimer Disease/diagnostic imaging ; Amyloid beta-Peptides/metabolism ; Aniline Compounds ; Brain/diagnostic imaging ; Brain/metabolism ; Ethylene Glycols ; Humans ; Positron-Emission Tomography ; Software
    Chemical Substances Amyloid beta-Peptides ; Aniline Compounds ; Ethylene Glycols ; florbetapir (6867Q6IKOD)
    Language Japanese
    Publishing date 2021-01-20
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2269092-X
    ISSN 1881-4883 ; 0369-4305
    ISSN (online) 1881-4883
    ISSN 0369-4305
    DOI 10.6009/jjrt.2021_JSRT_77.1.32
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Brain

    Ishibashi, Kenji / Miura, Yoshiharu / Wagatsuma, Kei / Kameyama, Masashi / Ishii, Kenji

    Journal of neuroimaging : official journal of the American Society of Neuroimaging

    2021  Volume 31, Issue 5, Page(s) 864–868

    Abstract: Background and purpose: Little evidence exists on the role of type 1 metabotropic glutamate receptor (mGluR1) in the pathophysiology of Alzheimer's disease (AD), although mGluR1 may be involved in the regulation of neuronal excitability and synaptic ... ...

    Abstract Background and purpose: Little evidence exists on the role of type 1 metabotropic glutamate receptor (mGluR1) in the pathophysiology of Alzheimer's disease (AD), although mGluR1 may be involved in the regulation of neuronal excitability and synaptic plasticity. We have recently reported that mGluR1 availability in the early stage of AD is equivalent to that in healthy subjects. This study aimed to address whether mGluR1 availability changes with the progression of AD.
    Methods: Eight patients with AD (79.1 ± 4.6 years) underwent a total of two positron emission tomography (PET) examinations using the mGluR1 radioligand during the early-to-middle stages of AD. The mean interval was 2.8 years. Volumes-of-interest were placed on the frontal, parietal, and temporal cortices, hippocampus, anterior and posterior lobes, and vermis in the cerebellum. The binding potential (BP
    Results: No significant difference was observed in BP
    Conclusion: This study suggests that mGluR1 availability is unchanged in the follow-up period of a few years during the early-to-middle stages of AD.
    MeSH term(s) Alzheimer Disease/diagnostic imaging ; Brain/diagnostic imaging ; Brain/metabolism ; Humans ; Positron-Emission Tomography ; Receptors, Metabotropic Glutamate/metabolism
    Chemical Substances Receptors, Metabotropic Glutamate
    Language English
    Publishing date 2021-06-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1071724-9
    ISSN 1552-6569 ; 1051-2284
    ISSN (online) 1552-6569
    ISSN 1051-2284
    DOI 10.1111/jon.12895
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