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Takahashi H, Takami Y, Takeda S, Hayakawa N, Nakajima T, Takeya Y, Matsuo-Hagiyama C, Arisawa A, Rakugi H, Tomiyama N. Imaging Biomarker for Early-Stage Alzheimer Disease: Utility of Hippocampal Histogram Analysis of Diffusion Metrics. AJNR Am J Neuroradiol 2024; 45:320-327. [PMID: 38331963 DOI: 10.3174/ajnr.a8106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 11/17/2023] [Indexed: 02/10/2024]
Abstract
BACKGROUND AND PURPOSE Biomarkers have been required for diagnosing early Alzheimer disease. We assessed the utility of hippocampal diffusion parameters for diagnosing Alzheimer disease pathology in mild cognitive impairment. MATERIALS AND METHODS Sixty-nine patients with mild cognitive impairment underwent both CSF measurement and multi-shell diffusion imaging at 3T. Based on the CSF biomarker level, patients were classified according to the presence (Alzheimer disease group, n = 35) or absence (non-Alzheimer disease group, n = 34) of Alzheimer disease pathology. Neurite orientation dispersion and density imaging and diffusion tensor imaging parametric maps were generated. Two observers independently created the hippocampal region of interest for calculating histogram features. Interobserver correlations were calculated. The statistical significance of intergroup differences was tested by using the Mann-Whitney U test. Logistic regression analyses, using both the clinical scale and the image data, were used to predict intergroup differences, after which group discriminations were performed. RESULTS Most intraclass correlation coefficient values were between 0.59 and 0.91. In the regions of interest of both observers, there were statistically significant intergroup differences for the left-side neurite orientation dispersion and density imaging-derived intracellular volume fraction, right-side diffusion tensor imaging-derived mean diffusivity, left-side diffusion tensor imaging-derived mean diffusivity, axial diffusivity, and radial diffusivity (P < .05). Logistic regression models revealed that diffusion parameters contributed the most to discriminating between the groups. The areas under the receiver operating characteristic curve for the regions of interest of observers A/B were 0.69/0.68, 0.69/0.68, 0.73/0.68, 0.71/0.68, and 0.68/0.68 for the left-side intracellular volume fraction (mean), right-side mean diffusivity (mean), left-side mean diffusivity (10th percentile), axial diffusivity (10th percentile), and radial diffusivity (mean). CONCLUSIONS Hippocampal diffusion parameters might be useful for the early diagnosis of Alzheimer disease.
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Affiliation(s)
- Hiroto Takahashi
- From the Department of Diagnostic and Interventional Radiology (H.T., C.M.-H., A.A., N.T.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Yoichi Takami
- Department of Geriatric and General Medicine (Y. Takami, N.H., T.N., Y. Takeya, H.R.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Shuko Takeda
- Department of Clinical Gene Therapy, Graduate School of Medicine (S.T.), Osaka University, Suita, Osaka, Japan
- Osaka Psychiatric Research Center (S.T.), Osaka Psychiatric Medical Center, Hirakata, Osaka, Japan
| | - Naoki Hayakawa
- Department of Geriatric and General Medicine (Y. Takami, N.H., T.N., Y. Takeya, H.R.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Tsuneo Nakajima
- Department of Geriatric and General Medicine (Y. Takami, N.H., T.N., Y. Takeya, H.R.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Yasushi Takeya
- Department of Geriatric and General Medicine (Y. Takami, N.H., T.N., Y. Takeya, H.R.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Chisato Matsuo-Hagiyama
- From the Department of Diagnostic and Interventional Radiology (H.T., C.M.-H., A.A., N.T.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Atsuko Arisawa
- From the Department of Diagnostic and Interventional Radiology (H.T., C.M.-H., A.A., N.T.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiromi Rakugi
- Department of Geriatric and General Medicine (Y. Takami, N.H., T.N., Y. Takeya, H.R.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Noriyuki Tomiyama
- From the Department of Diagnostic and Interventional Radiology (H.T., C.M.-H., A.A., N.T.), Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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Yamamoto S, Okita Y, Arita H, Sanada T, Sakai M, Arisawa A, Kagawa N, Shimosegawa E, Nakanishi K, Kinoshita M, Kishima H. Qualitative MR features to identify non-enhancing tumors within glioblastoma's T2-FLAIR hyperintense lesions. J Neurooncol 2023; 165:251-259. [PMID: 37917281 DOI: 10.1007/s11060-023-04454-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 09/13/2023] [Indexed: 11/04/2023]
Abstract
PURPOSE To identify qualitative MRI features of non-(contrast)-enhancing tumor (nCET) in glioblastoma's T2-FLAIR hyperintense lesion. METHODS Thirty-three histologically confirmed glioblastoma patients whose T1-, T2- and contrast-enhanced T1-weighted MRI and 11C-methionine positron emission tomography (Met-PET) were available were included in this study. Met-PET was utilized as a surrogate for tumor burden. Imaging features for identifying nCET were searched by qualitative examination of 156 targets. A new scoring system to identify nCET was established and validated by two independent observers. RESULTS Three imaging features were found helpful for identifying nCET; "Bulky gray matter involvement", "Around the rim of contrast-enhancement (Around-rim)," and "High-intensity on T1WI and low-intensity on T2WI (HighT1LowT2)" resulting in an nCET score = 2 × Bulky gray matter involvement - 2 × Around-rim + HighT1LowT2 + 2. The nCET score's classification performances of two independent observers measured by AUC were 0.78 and 0.80, with sensitivities and specificities using a threshold of four being 0.443 and 0.771, and 0.916 and 0.768, respectively. The weighted kappa coefficient for the nCET score was 0.946. CONCLUSION The current investigation demonstrated that qualitative assessments of glioblastoma's MRI might help identify nCET in T2/FLAIR high-intensity lesions. The novel nCET score is expected to aid in expanding treatment targets within the T2/FLAIR high-intensity lesions.
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Affiliation(s)
- Shota Yamamoto
- Department of Neurosurgery, Osaka Greneral Medical Center, Bandai-higashi 3-1-56, Sumiyoshi-ku, Osaka, 558-8558, Japan
- Department of Neurosurgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
- Department of Neurosurgery, Asahikawa Medical University, Midorigaoka-higashi 2-1-1-1, Asahikawa, Hokkaido, 078-8510, Japan
| | - Yoshiko Okita
- Department of Neurosurgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
| | - Hideyuki Arita
- Department of Neurosurgery, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567, Japan
| | - Takahiro Sanada
- Department of Neurosurgery, Asahikawa Medical University, Midorigaoka-higashi 2-1-1-1, Asahikawa, Hokkaido, 078-8510, Japan
| | - Mio Sakai
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567, Japan
| | - Atsuko Arisawa
- Department of Diagnostic Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
| | - Naoki Kagawa
- Department of Neurosurgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
| | - Katsuyuki Nakanishi
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567, Japan
| | - Manabu Kinoshita
- Department of Neurosurgery, Asahikawa Medical University, Midorigaoka-higashi 2-1-1-1, Asahikawa, Hokkaido, 078-8510, Japan.
| | - Haruhiko Kishima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
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Mavragani A, Fujita K, Oki R, Osaki Y, Miyamoto R, Morino H, Nagano S, Atsuta N, Kanazawa Y, Matsumoto Y, Arisawa A, Kawai H, Sato Y, Sakaguchi S, Yagi K, Hamatani T, Kagimura T, Yanagawa H, Mochizuki H, Doyu M, Sobue G, Harada M, Izumi Y. An Exploratory Trial of EPI-589 in Amyotrophic Lateral Sclerosis (EPIC-ALS): Protocol for a Multicenter, Open-Labeled, 24-Week, Single-Group Study. JMIR Res Protoc 2023; 12:e42032. [PMID: 36716091 PMCID: PMC9926342 DOI: 10.2196/42032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 11/20/2022] [Accepted: 12/08/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder, with its currently approved drugs, including riluzole and edaravone, showing limited therapeutic effects. Therefore, safe and effective drugs are urgently necessary. EPI-589 is an orally available, small-molecule, novel redox-active agent characterized by highly potent protective effects against oxidative stress with high blood-brain barrier permeability. Given the apparent oxidative stress and mitochondrial dysfunction involvement in the pathogenesis of ALS, EPI-589 may hold promise as a therapeutic agent. OBJECTIVE This protocol aims to describe the design and rationale for the EPI-589 Early Phase 2 Investigator-Initiated Clinical Trial for ALS (EPIC-ALS). METHODS EPIC-ALS is an explorative, open-labeled, single-arm trial that evaluates the safety and tolerability of EPI-589 in patients with ALS. This trial consists of 12-week run-in, 24-week treatment, and 4-week follow-up periods. Patients will receive 500 mg of EPI-589 3 times daily over the 24-week treatment period. Clinical assessments include the mean monthly change of Amyotrophic Lateral Sclerosis Functional Rating Scale-Revised total score. The biomarkers are selected to analyze the effect on oxidative stress and neuronal damage. The plasma biomarkers are 8-hydroxy-2'-deoxyguanosine (8-OHdG), 3-nitrotyrosine (3-NT), neurofilament light chain (NfL), phosphorylated neurofilament heavy chain (pNfH), homocysteine, and creatinine. The cerebrospinal fluid biomarkers are 8-OHdG, 3-NT, NfL, pNfH, and ornithine. The magnetic resonance biomarkers are fractional anisotropy in the corticospinal tract and N-acetylaspartate in the primary motor area. RESULTS This trial began data collection in September 2021 and is expected to be completed in October 2023. CONCLUSIONS This study can provide useful data to understand the characteristics of EPI-589. TRIAL REGISTRATION Japan Primary Registries Network jRCT2061210031; tinyurl.com/2p84emu6. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) DERR1-10.2196/42032.
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Affiliation(s)
| | - Koji Fujita
- Department of Neurology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Ryosuke Oki
- Department of Neurology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Yusuke Osaki
- Department of Neurology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Ryosuke Miyamoto
- Department of Neurology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Hiroyuki Morino
- Department of Medical Genetics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Seiichi Nagano
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Japan.,Department of Neurology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Naoki Atsuta
- Department of Neurology, Aichi Medical University School of Medicine, Nagakute, Japan
| | - Yuki Kanazawa
- Department of Biomedical Information Sciences, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Yuki Matsumoto
- Department of Radiology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Atsuko Arisawa
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hisashi Kawai
- Department of Radiology, Aichi Medical University School of Medicine, Nagakute, Japan
| | - Yasutaka Sato
- Clinical Research Center for Developmental Therapeutics, Tokushima University Hospital, Tokushima, Japan
| | - Satoshi Sakaguchi
- Clinical Research Center for Developmental Therapeutics, Tokushima University Hospital, Tokushima, Japan
| | - Kenta Yagi
- Clinical Research Center for Developmental Therapeutics, Tokushima University Hospital, Tokushima, Japan
| | | | - Tatsuo Kagimura
- The Translational Research Center for Medical Innovation, Foundation for Biomedical Research and Innovation at Kobe, Kobe, Japan
| | - Hiroaki Yanagawa
- Clinical Research Center for Developmental Therapeutics, Tokushima University Hospital, Tokushima, Japan
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Manabu Doyu
- Department of Neurology, Aichi Medical University School of Medicine, Nagakute, Japan
| | - Gen Sobue
- Aichi Medical University School of Medicine, Nagakute, Japan
| | - Masafumi Harada
- Department of Radiology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Yuishin Izumi
- Department of Neurology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
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Kuroda H, Okita Y, Arisawa A, Utugi R, Tachi T, Hirayama R, Kijima N, Nakamura H, Kagawa N, Kishima H. NI-3 FEASIBILITY OF MRI PERFUSION IN DISCRIMINATING BETWEEN EDEMA AND INFILTRATIVE AREAS IN THE PERI-GBM NON-CONTRAST T2 WEIGHTED HIGH AREA. Neurooncol Adv 2022. [DOI: 10.1093/noajnl/vdac167.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Abstract
Background
Glioblastomas are highly infiltrative tumors, and differentiating between infiltrating tumors and vasogenic edema occurring in the non-enhancing T2-weighted hyperintense area is challenging. Here, we differentiated between infiltrating tumors and edemas in glioblastomas using dynamic perfusion-weighted MR imaging.
Methods
Data were collected from 33 patients with glioblastomas and 15 with meningioma as controls, who underwent resection at our institution between January 2019 and March 2022. The MRI data included T2 weighted images and contrast-enhanced T1 weighted images, and dynamic perfusion-weighted MR imaging. Two neurosurgeons manually assigned regions of interest (ROIs) to infiltrating tumors and vasogenic edema based on a previous report using conventional MRI features. The ratio of cerebral blood volume (CBV), cerebral blood flow (CBF), and mean transit time (MTT) in the ROIs to that contralateral normal regions were calculated. We also histological analysis using histological specimens obtained by stereotactic biopsy in each ROI.
Results
CBF and MTT ratios of infiltrating tumors and edemas differed significantly (p<0.01), while CBF and MTT ratios of edemas and controls showed similarities. MTT values of controls and infiltrating tumors differed significantly (p=0.02). Receiver operating characteristic curve analysis revealed that CBF (area under the curve [AUC]=0.81) and MTT(AUC=0.95) were effective in distinguishing between infiltrating tumors and edemas. Pathological analysis revealed that cell density, MIB1-index, and microvessel density were higher in infiltrating tumors than in edemas.
Conclusions
Using dynamic perfusion-weighted MR imaging may prove useful in differentiating infiltrating tumors from edemas in the non-contrast T2 hyperintensity region of glioblastomas.
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Affiliation(s)
- Hideki Kuroda
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Yoshiko Okita
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | | | - Rena Utugi
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Tetsuro Tachi
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Ryuichi Hirayama
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Noriyuki Kijima
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Hajime Nakamura
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Naoki Kagawa
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
| | - Haruhiko Kishima
- The Department of Neurosurgery, University of Osaka, Osaka, Japan
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Fujita Y, Khoo HM, Hirayama M, Kawahara M, Koyama Y, Tarewaki H, Arisawa A, Yanagisawa T, Tani N, Oshino S, Lemieux L, Kishima H. Evaluating the Safety of Simultaneous Intracranial Electroencephalography and Functional Magnetic Resonance Imaging Acquisition Using a 3 Tesla Magnetic Resonance Imaging Scanner. Front Neurosci 2022; 16:921922. [PMID: 35812224 PMCID: PMC9259878 DOI: 10.3389/fnins.2022.921922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 05/25/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundThe unsurpassed sensitivity of intracranial electroencephalography (icEEG) and the growing interest in understanding human brain networks and ongoing activities in health and disease have make the simultaneous icEEG and functional magnetic resonance imaging acquisition (icEEG-fMRI) an attractive investigation tool. However, safety remains a crucial consideration, particularly due to the impact of the specific characteristics of icEEG and MRI technologies that were safe when used separately but may risk health when combined. Using a clinical 3-T scanner with body transmit and head-receive coils, we assessed the safety and feasibility of our icEEG-fMRI protocol.MethodsUsing platinum and platinum-iridium grid and depth electrodes implanted in a custom-made acrylic-gel phantom, we assessed safety by focusing on three factors. First, we measured radio frequency (RF)-induced heating of the electrodes during fast spin echo (FSE, as a control) and the three sequences in our icEEG-fMRI protocol. Heating was evaluated with electrodes placed orthogonal or parallel to the static magnetic field. Using the configuration with the greatest heating observed, we then measured the total heating induced in our protocol, which is a continuous 70-min icEEG-fMRI session comprising localizer, echo-planar imaging (EPI), and magnetization-prepared rapid gradient-echo sequences. Second, we measured the gradient switching-induced voltage using configurations mimicking electrode implantation in the frontal and temporal lobes. Third, we assessed the gradient switching-induced electrode movement by direct visual detection and image analyses.ResultsOn average, RF-induced local heating on the icEEG electrode contacts tested were greater in the orthogonal than parallel configuration, with a maximum increase of 0.2°C during EPI and 1.9°C during FSE. The total local heating was below the 1°C safety limit across all contacts tested during the 70-min icEEG-fMRI session. The induced voltage was within the 100-mV safety limit regardless of the configuration. No gradient switching-induced electrode displacement was observed.ConclusionWe provide evidence that the additional health risks associated with heating, neuronal stimulation, or device movement are low when acquiring fMRI at 3 T in the presence of clinical icEEG electrodes under the conditions reported in this study. High specific absorption ratio sequences such as FSE should be avoided to prevent potential inadvertent tissue heating.
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Affiliation(s)
- Yuya Fujita
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hui Ming Khoo
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
- *Correspondence: Hui Ming Khoo,
| | - Miki Hirayama
- Department of Radiology, Osaka University Hospital, Suita, Japan
| | - Masaaki Kawahara
- Department of Radiology, Osaka University Hospital, Suita, Japan
| | - Yoshihiro Koyama
- Department of Radiology, Osaka University Hospital, Suita, Japan
| | | | - Atsuko Arisawa
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Takufumi Yanagisawa
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Naoki Tani
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Satoru Oshino
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Louis Lemieux
- Department of Clinical and Experimental Epilepsy, UCL Queen Square Institute of Neurology, London, United Kingdom
| | - Haruhiko Kishima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
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Takahashi H, Kashiwagi N, Arisawa A, Matsuo C, Kato H, Adachi H, Kajiyama Y, Mochizuki H, Tomiyama N. Imaging of the nigrostriatal system for evaluating the preclinical phase of Parkinson's disease development: the utility of neuromelanin, diffusion MRI, and DAT-SPECT. Br J Radiol 2022; 95:20210837. [PMID: 34808066 PMCID: PMC8822574 DOI: 10.1259/bjr.20210837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
OBJECTIVE To assess the utility of examining the nigrostriatal system with MRI and dopamine transporter (DAT) imaging for evaluating the preclinical phase of Parkinson's disease (PD). METHODS The subjects were 32 patients with early PD and a history of probable rapid eye movement sleep behavior disorder (RBD; PD group), 15 patients with idiopathic RBD (RBD group), and 24 age-matched healthy controls (HC group) who underwent neuromelanin and diffusion tensor MRI for analysis of the substantia nigra pars compacta (SNpc). The RBD and PD groups underwent DAT imaging. In the RBD group, totals of 39 MRI and 27 DAT imaging examinations were obtained longitudinally. For each value, intergroup differences and receiver operating characteristic analysis for diagnostic performance were examined statistically. RESULTS The neuromelanin value was significantly lower and the diffusion tensor values except fractional anisotropy were significantly higher in the RBD and PD groups than in the HC group. The DAT specific binding ratio (SBR) was significantly lower in the PD group than in the RBD group. The areas under the receiver operating characteristic curves (AUCs) for neuromelanin/mean diffusivity value in the SNpc were 0.76/0.82 for diagnosing RBD and 0.83/0.80 for diagnosing PD. The area under the receiver operating characteristic curves for the SBR for discriminating PD from RBD was 0.87. CONCLUSION MRI and DAT imaging may be useful for evaluating sequential nigrostriatal changes during the preclinical phase of PD. ADVANCES IN KNOWLEDGE MRI detects nigrostriatal changes in both RBD and early PD, and DAT imaging detects nigrostriatal changes during the transition to PD in RBD.
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Affiliation(s)
| | - Nobuo Kashiwagi
- Department of Future Diagnostic Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Atsuko Arisawa
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Chisato Matsuo
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiroki Kato
- Department of Nuclear Medicine and Tracer Kinetics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiroyoshi Adachi
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yuta Kajiyama
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Noriyuki Tomiyama
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
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Yamamoto S, Sanada T, Sakai M, Arisawa A, Kagawa N, Shimosegawa E, Nakanishi K, Kanemura Y, Kinoshita M, Kishima H. Prediction and Visualization of Non-Enhancing Tumor in Glioblastoma via T1w/T2w-Ratio Map. Brain Sci 2022; 12:brainsci12010099. [PMID: 35053842 PMCID: PMC8774070 DOI: 10.3390/brainsci12010099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/06/2022] [Accepted: 01/09/2022] [Indexed: 11/28/2022] Open
Abstract
One of the challenges in glioblastoma (GBM) imaging is to visualize non-enhancing tumor (NET) lesions. The ratio of T1- and T2-weighted images (rT1/T2) is reported as a helpful imaging surrogate of microstructures of the brain. This research study investigated the possibility of using rT1/T2 as a surrogate for the T1- and T2-relaxation time of GBM to visualize NET effectively. The data of thirty-four histologically confirmed GBM patients whose T1-, T2- and contrast-enhanced T1-weighted MRI and 11C-methionine positron emission tomography (Met-PET) were available were collected for analysis. Two of them also underwent MR relaxometry with rT1/T2 reconstructed for all cases. Met-PET was used as ground truth with T2-FLAIR hyperintense lesion, with >1.5 in tumor-to-normal tissue ratio being NET. rT1/T2 values were compared with MR relaxometry and Met-PET. rT1/T2 values significantly correlated with both T1- and T2-relaxation times in a logarithmic manner (p < 0.05 for both cases). The distributions of rT1/T2 from Met-PET high and low T2-FLAIR hyperintense lesions were different and a novel metric named Likeliness of Methionine PET high (LMPH) deriving from rT1/T2 was statistically significant for detecting Met-PET high T2-FLAIR hyperintense lesions (mean AUC = 0.556 ± 0.117; p = 0.01). In conclusion, this research study supported the hypothesis that rT1/T2 could be a promising imaging marker for NET identification.
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Affiliation(s)
- Shota Yamamoto
- Department of Neurosurgery, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan; (S.Y.); (T.S.)
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita 565-0871, Japan; (N.K.); (H.K.)
| | - Takahiro Sanada
- Department of Neurosurgery, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan; (S.Y.); (T.S.)
| | - Mio Sakai
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, Chuo-ku, Osaka 541-8567, Japan; (M.S.); (K.N.)
| | - Atsuko Arisawa
- Department of Diagnostic Radiology, Osaka University Graduate School of Medicine, Suita 565-0871, Japan;
| | - Naoki Kagawa
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita 565-0871, Japan; (N.K.); (H.K.)
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita 565-0871, Japan;
| | - Katsuyuki Nakanishi
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, Chuo-ku, Osaka 541-8567, Japan; (M.S.); (K.N.)
| | - Yonehiro Kanemura
- Department of Biomedical Research and Innovation, Institute for Clinical Research, National Hospital Organization Osaka National Hospital, Chuo-ku, Osaka 540-0006, Japan;
| | - Manabu Kinoshita
- Department of Neurosurgery, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan; (S.Y.); (T.S.)
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita 565-0871, Japan; (N.K.); (H.K.)
- Department of Neurosurgery, Osaka International Cancer Institute, Chuo-ku, Osaka 541-8567, Japan
- Correspondence: ; Tel.: +81-6-6945-1181 or +81-166-68-2594; Fax: +81-166-68-2599
| | - Haruhiko Kishima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita 565-0871, Japan; (N.K.); (H.K.)
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Yamamoto S, Sanada T, Sakai M, Arisawa A, Shimosegawa E, Nakanishi K, Kanemura Y, Kagawa N, Kishima H, Kinoshita M. NI-14 estimation of property of MRI non-contrast enhanced lesion of Glioblastoma using T1/T2 ratio. Neurooncol Adv 2021. [PMCID: PMC8648156 DOI: 10.1093/noajnl/vdab159.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Background: Tumor mass of glioblastoma is considered to exist beyond gadolinium-enhancing lesion into T2/FLAIR-high intensity lesions (T2/FL-HIL) on MRI. However, it is challenging to differentiate non-enhancing tumor region (NET) from pure brain edema for T2/FL-HIL. The T1/T2 ratio (rT1/T2) is an MRI metric considered to semi-quantify the tissue relaxation time on MRI. This research tested the hypothesis that rT1/T2 is useful for identifying NET within T2/FL-HIL by comparing it with 11C-methionine positron emission tomography (MET-PET). Method: Forty-six glioblastoma (GBM) patients at Osaka International Cancer Institute and Osaka University Hospital where T1-, T2- and contrast-enhanced T1-weighted MRI and MET-PET were available were included in this study. rT1/T2 maps were obtained after signal corrections were performed, as reported previously. Region-of-interests (ROIs) were defined within T2/FL-HILs beyond the gadolinium-enhanced lesion. MET-PET and rT1/T2 maps were co-registered to the same coordinate system, and the relationship between methionine uptake and rT1/T2 values was examined in a voxel-wise manner.ResultApproximately three million voxels were included for analysis. Lesions with methionine uptake higher than 5.0 on T/N showed 0.7 < rT1/T2 < 0.98. For those with methionine uptake higher than 3.0, rT1/T2 was between 0.70 and 1.04.DiscussionThis report suggested that rT1/T2 represents histological characteristics of the glioblastoma within T2/FL-HIL. It also indicated that rT1/T2 could be a useful biomarker for detecting NET within T2/FL-HIL for glioblastoma.
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Affiliation(s)
| | | | - Mio Sakai
- Department of Radiology Osaka International Cancer Institute
| | - Atsuko Arisawa
- Department of Radiology Osaka University Graduate School of Medicine
| | - Eku Shimosegawa
- Department of Molecular Imaging in Medicine. Osaka University Graduate School of Medicine
| | | | - Yonehiro Kanemura
- Department of Biomedical Research and Innovation Clinical Research Center National Hospital Organization Osaka national Hospital
| | - Naoki Kagawa
- Department of Neurosurgery Osaka University Graduate School of Medicine
| | - Haruhiko Kishima
- Department of Neurosurgery Osaka University Graduate School of Medicine
| | - Manabu Kinoshita
- Department of Neurosurgery Asahikawa Medical University
- Department of Neurosurgery Osaka University Graduate School of Medicine
- Department of Neurosurgery Osaka International Cancer Institute
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9
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Sakisuka T, Kashiwagi N, Doi H, Takahashi H, Arisawa A, Matsuo C, Masuda Y, Inohara H, Sato K, Outani H, Ishii K, Tomiyama N. Prognostic factors for bone metastases from head and neck squamous cell carcinoma: A case series of 97 patients. Mol Clin Oncol 2021; 15:246. [PMID: 34650813 DOI: 10.3892/mco.2021.2408] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 08/04/2021] [Indexed: 12/11/2022] Open
Abstract
Although bone is the second-most frequent site of distant metastases of head and neck squamous cell carcinoma (HNSCC), variable prognostic factors in patients with bone metastases from HNSCC have not been fully investigated. The aim of the present study was to assess the prognostic factors affecting overall survival (OS) in these patients. The medical records of 97 patients at two institutions who developed bone metastases from HNSCC between January 2010 and December 2020 were retrospectively reviewed. A multivariate analysis using a Cox proportional hazards model was performed to identify potential clinical predictive factors for longer OS. The median OS was 7 months, and the 1- and 2-year OS rates for all patients were 35.4 and 19.2%, respectively. The independent predictive factors for longer OS were single bone metastasis, good performance status and administration of systemic chemotherapy. The median OS with each predictor was 10, 10 and 10.5 months, respectively. In a selected group of patients with these three factors, the OS was 14.5 months. In conclusion, single bone metastasis, a good performance status and systemic chemotherapy were independent predictors of longer OS in patients with HNSCC, but their contributions were limited.
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Affiliation(s)
- Takahisa Sakisuka
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Nobuo Kashiwagi
- Department of Future Diagnostic Radiology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Hiroshi Doi
- Department of Radiation Oncology, Kindai University Faculty of Medicine, Osakasayama, Osaka 589-8511, Japan
| | - Hiroto Takahashi
- Center for Twin Research, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Atsuko Arisawa
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Chisato Matsuo
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Yu Masuda
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Hidenori Inohara
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Kazuaki Sato
- Department of Pathology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Hidetatsu Outani
- Department of Orthopedic Surgery, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
| | - Kazunari Ishii
- Department of Radiology, Kindai University Faculty of Medicine, Osakasayama, Osaka 589-8511, Japan
| | - Noriyuki Tomiyama
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan
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10
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Asai K, Nakamura H, Watanabe Y, Nishida T, Sakai M, Arisawa A, Takagaki M, Arita H, Ozaki T, Kagawa N, Fujimoto Y, Nakanishi K, Kinoshita M, Kishima H. Efficacy of endovascular intratumoral embolization for meningioma: assessment using dynamic susceptibility contrast-enhanced perfusion-weighted imaging. J Neurointerv Surg 2021; 13:1167-1171. [PMID: 33722964 DOI: 10.1136/neurintsurg-2020-017116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 01/29/2021] [Accepted: 02/04/2021] [Indexed: 11/03/2022]
Abstract
BACKGROUND In preoperative embolization for intracranial meningioma, endovascular intratumoral embolization is considered to be more effective for the reduction of tumorous vascularity than proximal feeder occlusion. In this study, we aimed to reveal different efficacies for reducing tumor blood flow in meningiomas by comparing endovascular intratumoral embolization and proximal feeder occlusion using dynamic susceptibility contrast-enhanced perfusion-weighted imaging (DSC-PWI). METHODS 28 consecutive patients were included. DSC-PWI was performed before and after embolization for intracranial meningiomas. Normalized tumor blood volume (nTBV) of voxels of interest of whole tumors were measured from the DSC-PWI data before and after embolization. ΔnTBV% was compared between the cases that received intratumoral embolization and proximal feeder occlusion. RESULTS ΔnTBV% in the intratumoral embolization group (42.4±29.8%) was higher than that of the proximal feeder occlusion group (15.3±14.3%, p=0.0039). We used three types of embolic materials and ΔnTBV% did not differ between treatments with or without the use of each material: 42.8±42.4% vs 28.7±20.1% for microspheres (p=0.12), 36.1±20.6% vs 28.1±41.1% for n-butyl cyanoacrylate (p=0.33), and 32.3±37.3% vs 34.1±19.0% for bare platinum coils (p=0.77). CONCLUSIONS The flow reduction effect of intratumoral embolization was superior to that of proximal feeder occlusion in preoperative embolization for intracranial meningioma in an assessment using DSC-PWI.
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Affiliation(s)
- Katsunori Asai
- Neurosurgery, Osaka International Cancer Institute, Osaka, Japan .,Neurosurgery, Osaka Neurological Institute, Toyonaka, Japan
| | - Hajime Nakamura
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | | | - Takeo Nishida
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Mio Sakai
- Diagnostic and Interventional Radiology, Osaka International Cancer Institute, Osaka, Japan
| | - Atsuko Arisawa
- Diagnostic and Interventional Radiology, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Masatoshi Takagaki
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Hideyuki Arita
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Tomohiko Ozaki
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Naoki Kagawa
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Yasunori Fujimoto
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Katsuyuki Nakanishi
- Diagnostic and Interventional Radiology, Osaka International Cancer Institute, Osaka, Japan
| | - Manabu Kinoshita
- Neurosurgery, Osaka International Cancer Institute, Osaka, Japan.,Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
| | - Haruhiko Kishima
- Neurosurgery, Osaka University School of Medicine Graduate School of Medicine, Suita, Japan
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11
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Kinoshita M, Arita H, Takahashi M, Uda T, Fukai J, Ishibashi K, Kijima N, Hirayama R, Sakai M, Arisawa A, Takahashi H, Nakanishi K, Kagawa N, Ichimura K, Kanemura Y, Narita Y, Kishima H. Impact of Inversion Time for FLAIR Acquisition on the T2-FLAIR Mismatch Detectability for IDH-Mutant, Non-CODEL Astrocytomas. Front Oncol 2021; 10:596448. [PMID: 33520709 PMCID: PMC7841010 DOI: 10.3389/fonc.2020.596448] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 11/30/2020] [Indexed: 11/29/2022] Open
Abstract
The current research tested the hypothesis that inversion time (TI) shorter than 2,400 ms under 3T for FLAIR can improve the diagnostic accuracy of the T2-FLAIR mismatch sign for identifying IDHmt, non-CODEL astrocytomas. We prepared three different cohorts; 94 MRI from 76 IDHmt, non-CODEL Lower-grade gliomas (LrGGs), 33 MRI from 31 LrGG under the restriction of FLAIR being acquired with TI < 2,400 ms for 3T or 2,016 ms for 1.5T, and 112 MRI from 112 patients from the TCIA/TCGA dataset for LrGG. The presence or absence of the “T2-FLAIR mismatch sign” was evaluated, and we compared diagnostic accuracies according to TI used for FLAIR acquisition. The T2-FLAIR mismatch sign was more frequently positive when TI was shorter than 2,400 ms under 3T for FLAIR acquisition (p = 0.0009, Fisher’s exact test). The T2-FLAIR mismatch sign was positive only for IDHmt, non-CODEL astrocytomas even if we confined the cohort with FLAIR acquired with shorter TI (p = 0.0001, Fisher’s exact test). TCIA/TCGA dataset validated that the sensitivity, specificity, PPV, and NPV of the T2-FLAIR mismatch sign to identify IDHmt, non-CODEL astrocytomas improved from 31, 90, 79, and 51% to 67, 94, 92, and 74%, respectively and the area under the curve of ROC improved from 0.63 to 0.87 when FLAIR was acquired with shorter TI. We revealed that TI for FLAIR impacts the T2-FLAIR mismatch sign’s diagnostic accuracy and that FLAIR scanned with TI < 2,400 ms in 3T is necessary for LrGG imaging.
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Affiliation(s)
- Manabu Kinoshita
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hideyuki Arita
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan.,Department of Neurosurgery, Takatsuki General Hospital, Takatsuki, Japan
| | - Masamichi Takahashi
- Department of Neurosurgery and Neuro-Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Takehiro Uda
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Junya Fukai
- Department of Neurological Surgery, Wakayama Medical University, Wakayama, Japan
| | - Kenichi Ishibashi
- Department of Neurosurgery, Osaka City General Hospital, Osaka, Japan
| | - Noriyuki Kijima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Ryuichi Hirayama
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Mio Sakai
- Department of Diagnostic Radiology, Osaka International Cancer Institute, Osaka, Japan
| | - Atsuko Arisawa
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hiroto Takahashi
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Japan
| | - Katsuyuki Nakanishi
- Department of Diagnostic Radiology, Osaka International Cancer Institute, Osaka, Japan
| | - Naoki Kagawa
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Kouichi Ichimura
- Division of Brain Tumor Translational Research, National Cancer Center Research Institute, Tokyo, Japan
| | - Yonehiro Kanemura
- Department of Biomedical Research and Innovation, Institute for Clinical Research, National Hospital Organization Osaka National Hospital, Osaka, Japan
| | - Yoshitaka Narita
- Department of Neurosurgery and Neuro-Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Haruhiko Kishima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan
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12
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Kashiwagi N, Miyazaki K, Takahashi H, Tsuji K, Fujiwara M, Arisawa A, Nakamura H, Kishima H, Ishii K, Tomiyama N. Spontaneous closure of non-cavernous sinus dural arteriovenous fistulas: A case series and systematic review of the literature. J Neuroradiol 2020; 49:94-100. [PMID: 32918945 DOI: 10.1016/j.neurad.2020.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/03/2020] [Accepted: 09/03/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND AND PURPOSE To report 9 new cases of non-cavernous sinus dural arteriovenous fistulas (NCS-DAVFs) that closed spontaneously and systematically review reports of other cases in the literature. MATERIAL AND METHODS We performed a retrospective analysis of 9 cases from 2 institutions of NCS-DAVFs that closed spontaneously. Using PubMed and Scopus in accordance with the PRISMA guidelines, we systematically reviewed English language articles about NCS-DAVFs showing spontaneous closure. RESULTS Review of the cases from 2 institutions identified 9 cases of NCS-DAVFs showing spontaneous closure in follow-up magnetic resonance angiography (MRA), and the systematic review of the literature yielded an additional 38 cases, which had been diagnosed by repeated arteriography. Collectively, the patients included 23 men and 24 women with a mean age of 54 years. The shunts were located in the transverse-sigmoid sinus in 24 cases (51%), anterior condylar confluence in 11, and other locations in 12. Based on the venous drainage pattern on arteriography, 27 cases (57%) were classified as low-risk NCS-DAVF (without cortical venous reflux) and 17 were classified as high-risk NCS-DAVF (with cortical venous reflux). Shunt closure was observed within 3 months in 17 cases (36%). Extrinsic predisposing factors for shunt closure were detected in 14 cases (30%). These included angiography in 7 cases, sinus recanalization in 4, development of sinus occlusion in 2, and sinus compression by a newly developed hematoma in 1. CONCLUSION Spontaneous closures of NCS-DAVFs can occur for both high- and low-risk types. One-third of these closures occur within 3 months.
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Affiliation(s)
- Nobuo Kashiwagi
- Department of Future Diagnostic Radiology, Osaka University Graduate School of Medicine, Japan.
| | - Koichi Miyazaki
- Department of Radiology, Kindai University Faculty of Medicine, Japan.
| | - Hiroto Takahashi
- Center for twin research, Osaka University Graduate School of Medicine, Japan.
| | - Kiyoshi Tsuji
- Department of Neurosurgery, Kindai University Faculty of Medicine, Japan.
| | - Masahiro Fujiwara
- Department of Radiology, Osaka University Graduate School of Medicine, Japan.
| | - Atsuko Arisawa
- Department of Radiology, Osaka University Graduate School of Medicine, Japan.
| | - Hajime Nakamura
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Japan.
| | - Haruhiko Kishima
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Japan.
| | - Kazunari Ishii
- Department of Radiology, Kindai University Faculty of Medicine, Japan.
| | - Noriyuki Tomiyama
- Department of Radiology, Osaka University Graduate School of Medicine, Japan.
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13
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Bao S, Watanabe Y, Takahashi H, Tanaka H, Arisawa A, Matsuo C, Wu R, Fujimoto Y, Tomiyama N. Differentiating between Glioblastoma and Primary CNS Lymphoma Using Combined Whole-tumor Histogram Analysis of the Normalized Cerebral Blood Volume and the Apparent Diffusion Coefficient. Magn Reson Med Sci 2018; 18:53-61. [PMID: 29848919 PMCID: PMC6326759 DOI: 10.2463/mrms.mp.2017-0135] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Purpose: This study aimed to determine whether whole-tumor histogram analysis of normalized cerebral blood volume (nCBV) and apparent diffusion coefficient (ADC) for contrast-enhancing lesions can be used to differentiate between glioblastoma (GBM) and primary central nervous system lymphoma (PCNSL). Methods: From 20 patients, 9 with PCNSL and 11 with GBM without any hemorrhagic lesions, underwent MRI, including diffusion-weighted imaging and dynamic susceptibility contrast perfusion-weighted imaging before surgery. Histogram analysis of nCBV and ADC from whole-tumor voxels in contrast-enhancing lesions was performed. An unpaired t-test was used to compare the mean values for each type of tumor. A multivariate logistic regression model (LRM) was performed to classify GBM and PCNSL using the best parameters of ADC and nCBV. Results: All nCBV histogram parameters of GBMs were larger than those of PCNSLs, but only average nCBV was statistically significant after Bonferroni correction. Meanwhile, ADC histogram parameters were also larger in GBM compared to those in PCNSL, but these differences were not statistically significant. According to receiver operating characteristic curve analysis, the nCBV average and ADC 25th percentile demonstrated the largest area under the curve with values of 0.869 and 0.838, respectively. The LRM combining these two parameters differentiated between GBM and PCNSL with a higher area under the curve value (Logit (P) = −21.12 + 10.00 × ADC 25th percentile (10−3 mm2/s) + 5.420 × nCBV mean, P < 0.001). Conclusion: Our results suggest that whole-tumor histogram analysis of nCBV and ADC combined can be a valuable objective diagnostic method for differentiating between GBM and PCNSL.
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Affiliation(s)
- Shixing Bao
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Yoshiyuki Watanabe
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Hiroto Takahashi
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Hisashi Tanaka
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Atsuko Arisawa
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Chisato Matsuo
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Rongli Wu
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Yasunori Fujimoto
- Department of Neurosurgery, Osaka University Graduate School of Medicine
| | - Noriyuki Tomiyama
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
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14
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Arisawa A, Watanabe Y, Tanaka H, Takahashi H, Matsuo C, Fujiwara T, Fujiwara M, Fujimoto Y, Tomiyama N. Comparative study of pulsed-continuous arterial spin labeling and dynamic susceptibility contrast imaging by histogram analysis in evaluation of glial tumors. Neuroradiology 2018; 60:599-608. [DOI: 10.1007/s00234-018-2024-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 04/16/2018] [Indexed: 10/17/2022]
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15
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Tanaka H, Watanabe Y, Nakamura H, Takahashi H, Arisawa A, Fujiwara T, Matsuo C, Tomiyama N. Multiple blood flow measurements before and after carotid artery stenting via phase-contrast magnetic resonance imaging: An observational study. PLoS One 2018; 13:e0195099. [PMID: 29641548 PMCID: PMC5895018 DOI: 10.1371/journal.pone.0195099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2017] [Accepted: 03/18/2018] [Indexed: 11/19/2022] Open
Abstract
After carotid artery stenting, the procurement of information about blood flow redistribution among brain-feeding arteries and its time trend is essential to understanding a patient’s physiological background and to determine their care regimen. Cerebral blood flow has been measured twice following carotid artery stenting in few previous studies, with some discrepancies in the results. The purpose of this study was to measure cerebral blood flow at multiple time points after carotid artery stenting, and to elucidate the time trend of cerebral blood flow and redistribution among arteries. Blood flow rates in 11 subjects were measured preoperatively, at one day, one week, and about three months, respectively after carotid artery stenting by using phase-contrast magnetic resonance imaging. The target vessels were the bilateral internal carotid arteries, the basilar artery, and the bilateral middle cerebral arteries. Lumen was semi-automatically defined using an algorithm utilizing pulsatility. The results showed that blood flow rates in the stented internal carotid artery and the ipsilateral middle cerebral artery increased following carotid artery stenting. Blood flow rates in the contralateral internal carotid artery and the basilar artery gradually declined, and they were lower than the preoperative values at three months after stenting. The sum of blood flow rates of the bilateral internal carotid arteries and the basilar artery increased after carotid artery stenting, and then decreased over the next three months. There was no significant change in the blood flow rate in the contralateral middle cerebral artery. From these results, it was concluded that redistribution among the bilateral internal carotid arteries and the basilar artery occurs after carotid artery stenting, and that it takes months thereafter to reach another equilibrium.
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Affiliation(s)
- Hisashi Tanaka
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
- * E-mail:
| | - Yoshiyuki Watanabe
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hajime Nakamura
- Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiroto Takahashi
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Atsuko Arisawa
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Takuya Fujiwara
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Chisato Matsuo
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Noriyuki Tomiyama
- Department of Radiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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16
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Wu R, Watanabe Y, Arisawa A, Takahashi H, Tanaka H, Fujimoto Y, Watabe T, Isohashi K, Hatazawa J, Tomiyama N. Whole-tumor histogram analysis of the cerebral blood volume map: tumor volume defined by 11C-methionine positron emission tomography image improves the diagnostic accuracy of cerebral glioma grading. Jpn J Radiol 2017; 35:613-621. [PMID: 28879406 DOI: 10.1007/s11604-017-0675-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 08/04/2017] [Indexed: 11/27/2022]
Abstract
PURPOSE This study aimed to compare the tumor volume definition using conventional magnetic resonance (MR) and 11C-methionine positron emission tomography (MET/PET) images in the differentiation of the pre-operative glioma grade by using whole-tumor histogram analysis of normalized cerebral blood volume (nCBV) maps. MATERIALS AND METHODS Thirty-four patients with histopathologically proven primary brain low-grade gliomas (n = 15) and high-grade gliomas (n = 19) underwent pre-operative or pre-biopsy MET/PET, fluid-attenuated inversion recovery, dynamic susceptibility contrast perfusion-weighted magnetic resonance imaging, and contrast-enhanced T1-weighted at 3.0 T. The histogram distribution derived from the nCBV maps was obtained by co-registering the whole tumor volume delineated on conventional MR or MET/PET images, and eight histogram parameters were assessed. RESULTS The mean nCBV value had the highest AUC value (0.906) based on MET/PET images. Diagnostic accuracy significantly improved when the tumor volume was measured from MET/PET images compared with conventional MR images for the parameters of mean, 50th, and 75th percentile nCBV value (p = 0.0246, 0.0223, and 0.0150, respectively). CONCLUSION Whole-tumor histogram analysis of CBV map provides more valuable histogram parameters and increases diagnostic accuracy in the differentiation of pre-operative cerebral gliomas when the tumor volume is derived from MET/PET images.
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Affiliation(s)
- Rongli Wu
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yoshiyuki Watanabe
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Atsuko Arisawa
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hiroto Takahashi
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hisashi Tanaka
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yasunori Fujimoto
- Department of Neurosurgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Tadashi Watabe
- Department of Nuclear Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kayako Isohashi
- Department of Nuclear Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Jun Hatazawa
- Department of Nuclear Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Noriyuki Tomiyama
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
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Matsuo-Hagiyama C, Watanabe Y, Tanaka H, Takahashi H, Arisawa A, Yoshioka E, Nabatame S, Nakano S, Tomiyama N. Comparison of Silent and Conventional MR Imaging for the Evaluation of Myelination in Children. Magn Reson Med Sci 2016; 16:209-216. [PMID: 27795484 PMCID: PMC5600027 DOI: 10.2463/mrms.mp.2016-0045] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Purpose: Silent magnetic resonance imaging (MRI) scans produce reduced acoustic noise and are considered more gentle for sedated children. The aim of this study was to compare the validity of T1- (T1W) and T2-weighted (T2W) silent sequences for myelination assessment in children with conventional spin-echo sequences. Materials and Methods: A total of 30 children (21 boys, 9 girls; age range: 1–83 months, mean age: 35.5 months, median age: 28.5 months) were examined using both silent and spin-echo sequences. Acoustic noise levels were analyzed and compared. The degree of myelination was qualitatively assessed via consensus, and T1W and T2W signal intensities were quantitatively measured by percent contrast. Results: Acoustic noise levels were significantly lower during silent sequences than during conventional sequences (P < 0.0001 for both T1W and T2W). Inter-method comparison indicated overall good to excellent agreement (T1W and T2W images, κ = 0.76 and 0.80, respectively); however, agreement was poor for cerebellar myelination on T1W images (κ = 0.14). The percent contrast of silent and conventional MRI sequences had a strong correlation (T1W, correlation coefficient [CC] = 0.76; T1W excluding the middle cerebellar peduncle, CC = 0.82; T2W, CC = 0.91). Conclusions: For brain MRI, silent sequences significantly reduced acoustic noise and provided diagnostic image quality for myelination evaluations; however, the two methods differed with respect to cerebellar delineation on T1W sequences.
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Affiliation(s)
| | - Yoshiyuki Watanabe
- Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Hisashi Tanaka
- Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Hiroto Takahashi
- Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Atsuko Arisawa
- Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Eri Yoshioka
- Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
| | - Shin Nabatame
- Department of Pediatrics, Osaka University Graduate School of Medicine
| | - Sayaka Nakano
- Department of Pediatrics, Osaka University Graduate School of Medicine
| | - Noriyuki Tomiyama
- Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine
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Tsukabe A, Watanabe Y, Tanaka H, Kunitomi Y, Nishizawa M, Arisawa A, Yoshiya K, Shimazu T, Tomiyama N. Prevalence and diagnostic performance of computed tomography angiography spot sign for intracerebral hematoma expansion depend on scan timing. Neuroradiology 2014; 56:1039-45. [PMID: 25228452 DOI: 10.1007/s00234-014-1430-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 09/03/2014] [Indexed: 11/26/2022]
Abstract
INTRODUCTION The computed tomography angiography (CTA) spot sign correlates with intracerebral hemorrhage (ICH) expansion; however, various diagnostic performances for hematoma expansion, especially in sensitivity, have been reported. We aimed to assess the impact of scan timing of CTA on the diagnostic performance of the CTA spot sign for ICH expansion in two different arterial phases within patients. METHODS Eighty-three consecutive patients with primary ICH who received two sequential CTAs were recruited. Two neuroradiologists reviewed CTAs for CTA spot signs, while one reviewed initial and follow-up non-contrast CT for measuring ICH volume. The time interval between two phases was then calculated, and the diagnostic performance of CTA spot sign in each phase was evaluated. RESULTS CTA spot signs were observed in 20/83 (24.1 %) patients in the early phase and 44/83 (53.0%) patients in the late phase. The mean time interval between the two phases was 12.7 s. Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy for hematoma progression of CTA spot sign were 48.1, 87.5, 65.0, 77.8, and 74.7%, respectively, in early phase and 92.6, 66.1, 56.8, 94.9, and 74.7%, respectively, in late phase. The CTA spot sign was significantly associated with ICH expansion in early (P < 0.001) and late (P < 0.00001) phases (Pearson's chi-square test). CONCLUSION A mere 10-s difference in scan timing could make a difference on prevalence and diagnostic performance of the CTA spot sign, suggesting a need for the standardization of the CTA protocol to generalize the approach for effective clinical application.
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Affiliation(s)
- Akio Tsukabe
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan,
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19
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Watanabe Y, Tsukabe A, Kunitomi Y, Nishizawa M, Arisawa A, Tanaka H, Yoshiya K, Shimazu T, Tomiyama N. Dual-energy CT for detection of contrast enhancement or leakage within high-density haematomas in patients with intracranial haemorrhage. Neuroradiology 2014; 56:291-5. [PMID: 24510167 DOI: 10.1007/s00234-014-1333-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 01/22/2014] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Our study aimed to elucidate the diagnostic performance of dual-energy CT (DECT) in the detection of contrast enhancement in intracranial haematomas (ICrH) with early phase dual-energy computed tomography angiography (CTA) and compare the results with those obtained by delayed CT enhancement. METHODS Thirty-six patients with ICrH were retrospectively included in this study. All patients had undergone single-energy non-contrast CT and contrast-enhanced dual-source DECT. DECT images were post-processed with commercial software, followed by obtaining iodine images and virtual non-contrast images and generating combined images that created the impression of 120-kVp images. Two neuroradiologists, blinded to the patients' data, reviewed two reading sessions: session A (non-contrast CT and combined CT) and session B (non-contrast CT, combined CT, and iodine images) for detection of contrast enhancement in the haematomas. RESULTS Contrast leakage or enhancement was detected in 23 (57.5 %) out of 40 haemorrhagic lesions in 36 patients on delayed CT. Three enhanced lesions were depicted only in the DECT iodine images. The sensitivity, specificity, positive predictive value, and negative predictive value of session A were 82.6, 94.1, 95.0, and 80.0 %, respectively, and those of session B were 95.7, 94.1, 95.7, and 94.1 %, respectively. CONCLUSION DECT emphasised the iodine enhancement and facilitated the detection of contrast enhancement or leakage.
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Affiliation(s)
- Yoshiyuki Watanabe
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan,
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Yasutake Y, Fujii Y, Cheon WK, Arisawa A, Tamura T. Structure of vitamin D 3hydroxylase, a novel cytochrome P450 from Pseudonocardia autotrophica. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308090673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
We are using directed evolution to extend the range of dioxygenase-catalyzed biotransformations to include substrates that are either poorly accepted or not accepted at all by the naturally occurring enzymes. Here we report on the oxidation of a heterocyclic substrate, 4-picoline, by toluene dioxygenase (TDO) and improvement of the enzyme's activity by laboratory evolution. The biotransformation of 4-picoline proceeds at only approximately 4.5% of the rate of the natural reaction on toluene. Random mutagenesis, saturation mutagenesis, and screening directly for product formation using a modified Gibbs assay generated mutant TDO 3-B38, in which the wild-type stop codon was replaced with a codon encoding threonine. Escherichia coli-expressed TDO 3-B38 exhibited 5.6 times higher activity toward 4-picoline and approximately 20% more activity towards toluene than wild-type TDO. The product of the biotransformation of 4-picoline is 3-hydroxy-4-picoline; no cis-diols of 4-picoline were observed.
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Affiliation(s)
- T Sakamoto
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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22
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Joern JM, Sakamoto T, Arisawa A, Arnold FH. A versatile high throughput screen for dioxygenase activity using solid-phase digital imaging. J Biomol Screen 2001; 6:219-23. [PMID: 11689121 DOI: 10.1177/108705710100600403] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We have developed a solid-phase, high throughput (10,000 clones/day) screen for dioxygenase activity. The cis-dihydrodiol product of dioxygenase bioconversion is converted to a phenol by acidification or to a catechol by reaction with cis-dihydrodiol dehydrogenase. Gibbs reagent reacts quickly with these oxygenated aromatics to yield colored products that are quantifiable using a microplate reader or by digital imaging and image analysis. The method is reproducible and quantitative at product concentrations of only 30 microM, with essentially no background from media components. This method is an effective general screen for aromatic oxidation and should be a useful tool for the discovery and directed evolution of oxygenases.
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Affiliation(s)
- J M Joern
- California Institute of Technology, Pasadena, CA 91125, USA
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Abstract
BACKGROUND Oxygenases catalyze the hydroxylation of a wide variety of organic substrates. An ability to alter oxygenase substrate specificities and improve their activities and stabilities using recombinant DNA techniques would expand their use in processes such as chemical synthesis and bioremediation. Discovery and directed evolution of oxygenases require efficient screens that are sensitive to the activities of interest and can be applied to large numbers of crude enzyme samples. RESULTS Horseradish peroxidase (HRP) couples the phenolic products of hydroxylation of aromatic substrates to generate colored and/or fluorescent compounds that are easily detected spectroscopically in high-throughput screening. Coexpression of the coupling enzyme with a functional mono- or dioxygenase creates a pathway for the conversion of aromatic substrates into fluorescent compounds in vivo. We used this approach for detecting the products of the toluene-dioxygenase-catalyzed hydroxylation of chlorobenzene and to screen large mutant libraries of Pseudomonas putida cytochrome P450cam by fluorescence digital imaging. Colors generated by the HRP coupling reaction are sensitive to the site of oxygenase-catalyzed hydroxylation, allowing the screen to be used to identify catalysts with new or altered regiospecificities. CONCLUSIONS The coupled oxygenase-peroxidase reaction system is well suited for screening oxygenase libraries to identify mutants with desired features, including higher activity or stability and altered reaction specificity. This approach should also be useful for screening expressed DNA libraries and combinatorial chemical libraries for hydroxylation catalysts and for optimizing oxygenase reaction conditions.
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Affiliation(s)
- H Joo
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
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Arisawa A, Kawamura N, Narita T, Kojima I, Okamura K, Tsunekawa H, Yoshioka T, Okamoto R. Direct fermentative production of acyltylosins by genetically-engineered strains of Streptomyces fradiae. J Antibiot (Tokyo) 1996; 49:349-54. [PMID: 8641997 DOI: 10.7164/antibiotics.49.349] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A tylosin-producer, Streptomyces fradiae, was transformed with plasmids carrying genes from Streptomyces thermotolerans that are involved in acyl modification of macrolide antibiotics. A transformant with pMAB3, in which macrolide 4"-O-acyltransferase gene (acyB1) and its regulatory gene (acyB2) are subcloned, produced several types of 4"-O-acyltylosins. A transformant with pAB11 delta EH containing macrolide 3-O-acyltransferase gene (acyA) in addition to the above two genes produced 3-O-acetyltylosin and 3-O-acetyl-4"-O-acyltylosins. Among the products of the latter transformant, 3-O-acetyl-4"-O-isovaleryltylosin (AIV) was detected as a minor component. When L-leucine, a precursor of isovaleryl-CoA, was added to the medium at the late stage of the fermentation, AIV content among the total macrolides increased ten-fold and AIV became a main product. This fact suggests that a high level of endogenous isovaleryl-CoA may be essential for the selective production of AIV by S. fradiae carrying pAB11 delta EH.
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Affiliation(s)
- A Arisawa
- Merican Corporation, Central Research Laboratories, Kanagawa, Japan
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Arisawa A, Tsunekawa H, Okamura K, Okamoto R. Nucleotide sequence analysis of the carbomycin biosynthetic genes including the 3-O-acyltransferase gene from Streptomyces thermotolerans. Biosci Biotechnol Biochem 1995; 59:582-8. [PMID: 7772821 DOI: 10.1271/bbb.59.582] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A 3.2-kb DNA fragment of the carbomycin biosynthetic region including the 3-O-acyltransferase gene (acyA) from Streptomyces thermotolerans was sequenced, and four ORFs were found in the fragment. The second ORF, designated ORF-A, was transcribed in the opposite direction to the other three ORFs. The first ORF was identified as carA, a gene for carbomycin resistance. The amino acid sequence of ORF-A was homologous to proteins of the cytochrome P-450 family. Streptomyces lividans transformed with pCB20, in which ORF-A was subcloned, epoxidized carbomycin B at its C-12, 13 positions, thus producing carbomycin A. The third ORF, the amino acid sequence of which showed a homology to macrolide antibiotics O-acyltransferases was identified as acyA. The last ORF (ORF-B), which starts just 3 bp downstream from the TGA termination codon of acyA, was thought to be a carbomycin 4-O-methyltransferase gene, because the amino acid sequence deduced from ORF-B showed high homology to a putative midecamycin 4-O-methyltransferase encoded on mdmC.
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Affiliation(s)
- A Arisawa
- Mercian Corporation, Central Research Laboratories, Kanagawa, Japan
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Arisawa A, Kawamura N, Takeda K, Tsunekawa H, Okamura K, Okamoto R. Cloning of the macrolide antibiotic biosynthesis gene acyA, which encodes 3-O-acyltransferase, from Streptomyces thermotolerans and its use for direct fermentative production of a hybrid macrolide antibiotic. Appl Environ Microbiol 1994; 60:2657-60. [PMID: 8074537 PMCID: PMC201700 DOI: 10.1128/aem.60.7.2657-2660.1994] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A gene encoding the macrolide modification enzyme 3-O-acyltransferase (acyA) was cloned by chromosome walking onto the carbomycin biosynthetic region in Streptomyces thermotolerans TH475, with the 3' region of the gene encoding the macrolide modification enzyme 4"-O-acyltransferase (acyB1) as a probe. A shortened fragment (1.8 kb) containing acyA was subcloned with pIJ350. A high-level tylosin producer, Streptomyces fradiae MBBF, transformed with the plasmid could produce a hybrid macrolide, 3-O-acetyltylosin, most efficiently.
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Affiliation(s)
- A Arisawa
- Mercian Corporation, Central Research Laboratories, Kanagawa, Japan
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Arisawa A, Kawamura N, Tsunekawa H, Okamura K, Tone H, Okamoto R. Cloning and nucleotide sequences of two genes involved in the 4''-O-acylation of macrolide antibiotics from Streptomyces thermotolerans. Biosci Biotechnol Biochem 1993; 57:2020-5. [PMID: 7764361 DOI: 10.1271/bbb.57.2020] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A DNA fragment responsible for the 4''-O-acylation of macrolide antibiotics was cloned from a mutant strain of the carbomycin producer Streptomyces thermotolerans. The gene encoding the macrolide 4''-O-acyltransferase was within a 2.7-kb region of the cloned fragment (15-kb). Streptomyces lividans carrying the region converted exogenously added tylosin to 4''-O-acyltylosins. Nucleotide sequencing of the region showed two open reading frames (ORFs). Expression assay using deleted plasmids showed that both ORFs were essential for optimal expression of the acyltransferase activity. One of them (acyB1) was identical with carE reported previously as a gene encoding 4''-mycarosyl isovaleryl-CoA transferase. The other (acyB2) was assumed to encode a novel regulatory protein that could active acyB1 expression. acyB1 and acyB2 were highly conserved among streptomycetes with macrolide 4''-O-acyl transferase activity.
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Affiliation(s)
- A Arisawa
- Mercian Corporation, Central Research Laboratories, Kanagawa, Japan
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Abstract
Rat genomic regions covering c-myc were cloned from the DNA of both normal liver and two lines of Morris hepatomas, one of which had c-myc amplification. The three restriction maps showed perfect agreement within the overlapping regions. The 7 kb regions, which included the entire normal rat c-myc and the region 2.2 kb upstream, and one from the hepatomas, were sequenced and found to be identical. The coding regions of exons 2 and 3 were highly conserved between rat, mouse and man, but some differences in amino acids were noted. Exon 1 and the non-coding region of exon 3 showed limited homology between the three species. Rat exon 1 contained several nonsense codons in each frame and no ATG codon, indicating there to be no coding capacity in this exon. The 2.2 kb upstream regions and the introns compared showed unusual conservation between the rat and human genes. Some motifs, previously proposed as having a functional role in human c-myc, were also found in equivalent positions of the rat sequence. Nucleas S1 protection mapping revealed the second promoter to be preferentially used in most tissues or in hepatoma cells, and the second poly A addition signal to be the only one functional in all the RNA sources examined.
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Ikezoe J, Sone S, Higashihara T, Morimoto S, Arisawa A, Kuriyama K, Taguchi T, Monden Y, Nakahara K. [Ultrasonically guided drainage of thymic cyst]. Rinsho Hoshasen 1985; 30:411-4. [PMID: 3894719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Ikezoe J, Sone S, Higashihara T, Morimoto S, Arisawa A, Kuriyama K, Taguchi T, Monden Y, Nakahara K. [Ultrasonographic and CT findings in mesothelioma]. Rinsho Hoshasen 1985; 30:307-10. [PMID: 3889428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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