1
|
Pan C, Ikeda H, Minote M, Tokuda T, Kuranaga T, Taniguchi T, Shinzato N, Onaka H, Kakeya H. Amoxetamide A, a new anoikis inducer, produced by combined-culture of Amycolatopsis sp. and Tsukamurella pulmonis. J Antibiot (Tokyo) 2024; 77:66-70. [PMID: 37903880 DOI: 10.1038/s41429-023-00668-1] [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: 08/09/2023] [Revised: 10/01/2023] [Accepted: 10/16/2023] [Indexed: 11/01/2023]
Abstract
Cancer cells including colorectal cancer cells are resistant to anoikis, an anchorage-independent programmed death, which enables metastasis and subsequent survival in a new tumor microenvironment. In this study, we identified a new anoikis inducer, amoxetamide A (1) with a β-lactone moiety, that was produced by combined-culture of Amycolatopsis sp. 26-4 and mycolic acid-containing bacteria (MACB) Tsukamurella pulmonis TP-B0596. The structure of 1 including the stereochemistry of C8 was determined by MS and NMR spectroscopy and modified Mosher's method, and the absolute configurations of C11 and C12 were suggested as 11R and 12S, respectively, by GIAO NMR calculations. Amoxetamide A (1) exhibited anoikis-inducing activity in human colorectal cancer HT-29 cells in anchorage-independent culture conditions.
Collapse
Affiliation(s)
- Chengqian Pan
- Department of System Chemotherapy and Molecular Sciences, Division of Medicinal Frontier Sciences, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, China
| | - Hiroaki Ikeda
- Department of System Chemotherapy and Molecular Sciences, Division of Medicinal Frontier Sciences, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Mayuri Minote
- Department of System Chemotherapy and Molecular Sciences, Division of Medicinal Frontier Sciences, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Tensei Tokuda
- Department of System Chemotherapy and Molecular Sciences, Division of Medicinal Frontier Sciences, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Takefumi Kuranaga
- Department of System Chemotherapy and Molecular Sciences, Division of Medicinal Frontier Sciences, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Tohru Taniguchi
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
| | - Naoya Shinzato
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, 903-0213, Japan
| | - Hiroyasu Onaka
- Department of Life Science, Faculty of Science, Gakushuin University, Tokyo, 171-8588, Japan
| | - Hideaki Kakeya
- Department of System Chemotherapy and Molecular Sciences, Division of Medicinal Frontier Sciences, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan.
| |
Collapse
|
2
|
Saito Y, Takami H, Abdelhamid Ahmed AH, Nakao A, Ho K, Tokuda T, Miyata R, Randolph GW, Ando N. Association of symptomatic gallstones and primary hyperparathyroidism: a propensity score-matched analysis. Br J Surg 2021; 108:e336-e337. [PMID: 34370814 PMCID: PMC10364881 DOI: 10.1093/bjs/znab249] [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] [Received: 04/01/2021] [Revised: 06/02/2021] [Accepted: 06/10/2021] [Indexed: 11/12/2022]
Abstract
If the prevalence of primary hyperparathyroidism (PHPT) in patients with symptomatic gallstones is higher than that in the general population, PHPT screening could reveal important clinical implications. We observed that the prevalence of PHPT in these patients was higher compared to that of healthy matched controls.
Collapse
Affiliation(s)
- Y Saito
- Department of Surgery, International Goodwill Hospital, Yokohama, Kanagawa, Japan.,Department of Surgery, Keio University School of Medicine, Tokyo, Japan.,Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA
| | - H Takami
- Department of Surgery, Ito Hospital, Tokyo, Japan
| | - A H Abdelhamid Ahmed
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA
| | - A Nakao
- Department of Surgery, International Goodwill Hospital, Yokohama, Kanagawa, Japan
| | - K Ho
- Department of Surgery, International Goodwill Hospital, Yokohama, Kanagawa, Japan
| | - T Tokuda
- Department of Surgery, International Goodwill Hospital, Yokohama, Kanagawa, Japan
| | - R Miyata
- Department of Surgery, International Goodwill Hospital, Yokohama, Kanagawa, Japan
| | - G W Randolph
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA
| | - N Ando
- Department of Surgery, International Goodwill Hospital, Yokohama, Kanagawa, Japan
| |
Collapse
|
3
|
Tokuda T, Oba Y, Koshida R, Suzuki Y, Murata A, Ito T. Prediction of the Technical Success of Endovascular Therapy in Patients with Critical Limb Threatening Ischaemia Using the Global Limb Anatomical Staging System. J Vasc Surg 2020. [DOI: 10.1016/j.jvs.2020.09.015] [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: 10/22/2022]
|
4
|
Matsuda H, Kagase A, Tokuda T, Ochiumi Y, Takeya M, Sato K, Murata A, Suzuki Y, Ito T. P269 Mid-term clinical outcomes of biodegradable polymer everolimus-eluting stents compared with durable polymer everolimus-eluting stents: a propensity-matched study. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehz872.092] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Introduction: Several studies have reported that durable polymer drug-eluting stents could cause delayed healing and late catch-up. Although biodegradable polymer everolimus-eluting stents (BP-EES) might solve these problems, there is few data about mid-term clinical outcomes of BP-EES compared with durable polymer everolimus-eluting stents (DP-EES).
Purpose
This study aimed to compare mid-term clinical outcomes between BP-EES and DP-EES.
Methods
Between January to December 2016, 206 consecutive patients were treated with BP-EES and 177 consecutive patients were treated with DP-EES in our Heart Center. The primary endpoint was 3-year cumulative incidence of target lesion failure (TLF) defined as cardiac death, target vessel-related myocardial infarction and clinical-driven target lesion revascularization. Moreover, clinical-driven target vessel revascularization (TVR) and definite stent thrombosis (ST) were also evaluated.
Results
After propensity score matching, 160 patients were selected in each group. At 3 years, the cumulative incidences of TLF were 4.1% in BP-EES group vs. 7.9% in DP-EES (p = 0.12). Similarly, those of clinical-driven TVR were not different between the 2 groups (10.9% vs. 8.0%, p = 0.39). The incidence of definite ST in BP-EES tended to be higher than in that of DP-EES (BP-EES vs. DP-EES; 0% vs. 1.8%, p = 0.06).
Conclusions
There were no significant differences of TLF between BP-EES and DP-EES within 3 years. In this study, BP-EES seems to prevent definite ST and be safer than DP-EES in mid-term.
Abstract P269 Figure.
Collapse
Affiliation(s)
| | - A Kagase
- Nagoya Heart Center, Nagoya, Japan
| | - T Tokuda
- Nagoya Heart Center, Nagoya, Japan
| | | | - M Takeya
- Nagoya Heart Center, Nagoya, Japan
| | - K Sato
- Nagoya Heart Center, Nagoya, Japan
| | - A Murata
- Nagoya Heart Center, Nagoya, Japan
| | - Y Suzuki
- Nagoya Heart Center, Nagoya, Japan
| | - T Ito
- Nagoya Heart Center, Nagoya, Japan
| |
Collapse
|
5
|
Matsuda H, Kagase A, Tokuda T, Ochiumi Y, Takeya M, Sato K, Murata A, Suzuki Y, Ito T. P2796Biodegradable polymer everolimus-eluting stents versus durable polymer everolimus-eluting stents in diabetic patients: a 3-year propensity-matched study. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.1109] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background and introduction
Diabetic patients are at high risk of adverse cardiovascular events after percutaneous coronary intervention (PCI) even with durable polymer drug-eluting stents. A biodegradable polymer everolimus-eluting stents (BP-EES) might improve clinical outcomes in patients with diabetes mellitus.
Purpose
This study aimed to compare the mid-term clinical outcomes between BP-EES and durable polymer everolimus-eluting stents (DP-EES) in diabetic patients.
Methods
We investigated consecutive 383 patients treated with BP-EES or DP-EES at our Heart Center between January and December 2016. Among these patients, 155 (40.5%) patients had diabetes mellitus. The primary endpoint was 3-year cumulative incidence of target lesion failure (TLF) defined as target vessel-related myocardial infarction (MI) and clinical-driven target lesion revascularization (TLR). Moreover, the incidence of definite stent thrombosis (ST) was also evaluated.
Results
After propensity score matching, 148 patients were divided into 2 groups (BP-EES; N=74, DP-EES; N=74). The 3-year cumulative incidences of TLF were significantly lower in BP-EES group than in DP-EES group (BP-EES vs. DP-EES; 1.4% vs. 11.4%, p=0.01). The incidence of cardiac death, target vessel-related MI, and definite ST were none in the both group.
Figure 1
Conclusions
In diabetic patients, the incidence of TLR within 3 years was significantly lower in BP-EES than in DP-EES. In PCI for diabetic patients, BP-EES might improve clinical outcomes compared to DP-EES.
Collapse
Affiliation(s)
| | - A Kagase
- Nagoya Heart Center, Nagoya, Japan
| | - T Tokuda
- Nagoya Heart Center, Nagoya, Japan
| | | | - M Takeya
- Nagoya Heart Center, Nagoya, Japan
| | - K Sato
- Nagoya Heart Center, Nagoya, Japan
| | - A Murata
- Nagoya Heart Center, Nagoya, Japan
| | - Y Suzuki
- Nagoya Heart Center, Nagoya, Japan
| | - T Ito
- Nagoya Heart Center, Nagoya, Japan
| |
Collapse
|
6
|
Seki H, Sakurai T, Shimizu K, Mizuno S, Tokuda T, Kaburagi T, Seki M, Karahashi T, Nakajima K. Abstract P2-14-09: A novel nipple aleolar complex involvement predictive index (NACPI) for indicating nipple sparing mastectomy in breast cancer patients. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p2-14-09] [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: 11/16/2022]
Abstract
Abstract
Background: While Preservation of NAC is concerned to increase the risk of local recurrences in the retroareolar glandular tissue, nipple sparing mastectomy (NSM) is increasing in patients with breast cancer and has been shown to result in better cosmetic outcome and the benefit for quality-of-life. It is necessary to predict accurately NAC involvement in order to select which patients may be candidates to NSM. The distance from the nipple to the tumor (DNT) is proposed as one of the best criteria to select the patient. The purpose of this study is to identify the predictors of NAC involvement retrospectively and to develop a clinical predictive model to select the patients who can be offered preservation of NAC.Methods: A total of 168 patients with primary operable breast cancer who received subcutaneous mastectomy for breast reconstruction at Saitama Medical Center during July 2013 to December 2017 were selected from the hospital's surgical database. NAC involvement was defined by the presence of invasive carcinoma and/or ductal carcinoma in situ at the subareolar margin.
Results: Of the 148 patients who were preserved NAC, 89.9% (133/148) were NAC involvement negative and 10.1% (15/148) were positive in permanent pathological specimens. Of the 20 patients who were resected NAC, NAC involvement positivity was only 50.0% (10/20). This revealed that NAC involvement with a sensitivity (SN) of 40.0%, a specificity (SP) of 93.0%, a positive predictive value (PPV) of 50.0% and a negative predictive value (NPV) of 89.9% (AUC=0.665, 95%CI: 0.5345-0.796). In 140 patients who were performed intraoperative sub-nipple frozen section biopsy, the findings was significantly associated with NAC involvement (P<0.001), and which predict the NAC involvement with a SN of 93.3%, a SP of 89.6%, a PPV of 51.9%, and a NPV of 99.1% (AUC=0.915, 95%CI: 0.835-0.994). In the concordance rate between frozen section findings and definitive pathologic results, DCIS was 53% (9/17), atypical cell was 50% (2/4) and invasive ductal carcinoma was 100% (3/3). Correlation between NAC involvement and clinicopathological factors, tumor size ≥4cm (P<0.001), DNT <1cm by MMG (P=0.002), DNT <1cm by MRI (P<0.001), nipple contrast findings by MRI (P<0.001), tumor in central portion (P<0.001), multicentirc/focal lesion (P<0.001), c(N) positive (P=0.014) were significant relation with NAC involvement. Each predictors were scored 0 or 1, and the total score of 0-3 points was defined as low risk, 4 points as intermediate risk, and 5-7 points as high risk. Depending on this categorized classification, the NAC involvement rate was 3.5% (5/142) in low risk, 68.7% (11/16) in intermediate risk, 90.0% (9/10) in high risk and there was a significant correlation between the risk group and NAC involvement (P <0.001). Notably, assuming that NAC is preserved for low risk patients and is resected for intermediate and high risk patients, NACPI contributes to improve the accuracy of selecting the surgical procedures (SN 80.0%, SP 95.8%, PPV 76.9%, NPV 96.5% (AUC=0.879, 95%CI: 0.784-0.974)).Conclusion: This study suggests that NACPI can help us indicating subcutaneous mastectomy for the breast cancer patients who request preserve NAC with more oncological safety.
Citation Format: Seki H, Sakurai T, Shimizu K, Mizuno S, Tokuda T, Kaburagi T, Seki M, Karahashi T, Nakajima K. A novel nipple aleolar complex involvement predictive index (NACPI) for indicating nipple sparing mastectomy in breast cancer patients [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P2-14-09.
Collapse
Affiliation(s)
- H Seki
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - T Sakurai
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - K Shimizu
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - S Mizuno
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - T Tokuda
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - T Kaburagi
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - M Seki
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - T Karahashi
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| | - K Nakajima
- Saitama Medical Center, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan; Division of Pathology, 4-9-3 Kitaurawa, Urawa City, Saitama, Japan
| |
Collapse
|
7
|
Makino K, Ito Y, Hirano K, Yamawaki M, Araki M, Kobayashi N, Mori S, Sakamoto Y, Tsutsumi M, Honda Y, Tokuda T, Shigemitsu S. P3570Impact of nutritional status on clinical outcomes in critical limb ischemia with tissue loss after endovascular treatment. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- K Makino
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - Y Ito
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - K Hirano
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - M Yamawaki
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - M Araki
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - N Kobayashi
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - S Mori
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - Y Sakamoto
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - M Tsutsumi
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - Y Honda
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - T Tokuda
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| | - S Shigemitsu
- Saiseikai Yokohama City Eastern Hospital, Yokohama, Japan
| |
Collapse
|
8
|
Tsutsumi M, Ito Y, Hirano K, Yamawaki M, Araki M, Kobayashi N, Mori S, Sakamoto Y, Honda Y, Tokuda T, Makino K, Shirai S. P791Comparison between a novel bioabsorbable polymer everolimus-eluting stent and a durable polymer everolimus-eluting stent. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M Tsutsumi
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - Y Ito
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - K Hirano
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - M Yamawaki
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - M Araki
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - N Kobayashi
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - S Mori
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - Y Sakamoto
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - Y Honda
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - T Tokuda
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - K Makino
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| | - S Shirai
- Saiseikai Yokohama City Eastern Hospital, Department of Cardiology, Yokohama, Japan
| |
Collapse
|
9
|
Azuma Y, Tokuda T, Kushimura Y, Yamamoto I, Yoshida H, Mizuta I, Ueyama M, Nagai Y, Nakagawa M, Mizuno T, Yamaguchi M. The search for genes that modulate FUS-mediated phenotypes by Drosophila amyotrophic lateral sclerosis model. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.575] [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: 10/18/2022]
|
10
|
Kushimura Y, Tokuda T, Azuma Y, Yamamoto I, Yoshida H, Mizuta I, Ueyama M, Nagai Y, Nakagawa M, Mizuno T, Yamaguchi M. Loss of function mutant of ter94, Drosophila VCP, partially enhanced motor neuron degeneration induced by knockdown of TBPH, Drosophila TDP-43. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1586] [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: 10/18/2022]
|
11
|
Kuriyama N, Ihara M, Koyama T, Mizuno T, Ozaki E, Kondo M, Tokuda T, Tamura A, Kazuo T, Nakagawa M, Watanabe Y. Vasoactive mid-regional pro-adrenomedullin is associated with cognitive decline accompa-nying deep white matter lesions in the brain: A longitudinal brain MRI study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.940] [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: 11/30/2022]
|
12
|
Tsutsumi M, Ito Y, Hirano K, Yamawaki M, Araki M, Kobayashi N, Sakamoto Y, Mori S, Takama T, Honda Y, Tokuda T, Makino K, Shirai S. P5188Long-term clinical outcomes after polymer-free paclitaxel-coated stent implantation for femoropopliteal disease in comparison with bare metal stent. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5188] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
13
|
Kobayashi N, Hirano K, Yamawaki M, Araki M, Sakamoto Y, Mori S, Tsutsumi M, Honda Y, Tokuda T, Makino K, Shirai S, Ito Y. P5215Severity of angiographic dissection and future restenosis after balloon angioplasty for femoropopliteal disease. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5215] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
14
|
Tamita K, Iwamura T, Maeda M, Tokuda T, Shimizu T, Takaoka N, Hyodo E, Hashimura H, Yamamuro A. P4320Enhancement patterns detected by multidetector computed tomography are associated with the long-term prognosis in patients with acute myocardial infarction. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
15
|
Noto YI, Shiga K, Tsuji Y, Kondo M, Tokuda T, Nakagawa M, Mizuno T. P603: Contrasting echogenicity in FDP-FCU: a diagnostic ultrasound pattern in sporadic inclusion body myositis. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50696-7] [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: 11/24/2022]
|
16
|
Tokuda T, Miyatani T, Maezawa Y, Kobayashi T, Noda T, Sasagawa K, Ohta J. A CMOS-based on-chip neural interface device equipped with integrated LED array for optogenetics. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2012:5146-9. [PMID: 23367087 DOI: 10.1109/embc.2012.6347152] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A novel CMOS-based neural interface device equipped with an integrated micro light source array was proposed and demonstrated. Target application of the device is optogenetics. GaInN LED array formed on sapphire substrate was successfully assembled with a multifunctional CMOS image sensor which is capable of injecting current via any of the pixel. We demonstrated addressable LED operation with the present device. The device has advantages such as simultaneous multi-site stimulation and on-chip optical imaging, that are not available with previously reported LED array device for optogenetics.
Collapse
Affiliation(s)
- T Tokuda
- Graduate School of Materials Science, NaraInstitute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0192, JAPAN.
| | | | | | | | | | | | | |
Collapse
|
17
|
Kondo M, Tokuda T, Itsukage M, Kuriyama N, Matsushima S, Yamada K, Nakanishi H, Ishikawa M, Nakagawa M. Distribution of amyloid burden differs between idiopathic normal pressure hydrocephalus and Alzheimer's disease. Neuroradiol J 2013; 26:41-6. [PMID: 23859166 DOI: 10.1177/197140091302600107] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Accepted: 02/19/2013] [Indexed: 11/15/2022] Open
Abstract
This study aimed to elucidate the incidence and distribution of the cortical retention of Pittsburgh compound B (PIB) in patients with idiopathic normal pressure hydrocephalus (iNPH) and clarify the differences from those in patients with Alzheimer's disease (AD). Ten patients with iNPH without any clinical signs indicative of AD were enrolled in this study. Cerebral retention of PIB in positron emission tomography (PET) in iNPH patients was compared with those in seven age-matched AD patients. The CSF levels of β-amyloid 1-42 peptide (Aβ42), which inversely decrease with cerebral amyloid burden, were also measured. Three of the ten patients with iNPH showed increased cortical PIB retention. Although the mean cortical SUV ratios were similar, the distribution of PIB retention differed widely between the patients with iNPH and AD. PIB retention was limited to the high-convexity parasagittal areas in iNPH patients, whereas it spread over the frontal and parietotemporal areas in AD. The coronal images of PIB-PET were more informative than conventional transverse images in evaluating the distribution pattern of cortical PIB retention. Two iNPH patients with higher cortical PIB retention had the lowest levels of CSF Aβ42, indicating that PIB retention in iNPH would not reflect a simple delay in PIB clearance but its binding to existing Aβ amyloid in the brain. Our results indicate that iNPH is one of the diseases exhibiting cortical PIB retention. The characteristic distribution of PIB retention in iNPH could be useful in the differential diagnosis between iNPH and AD.
Collapse
Affiliation(s)
- M Kondo
- Department of Neurology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Tokuda T, Nakajima S, Maezawa Y, Noda T, Sasagawa K, Ishikawa Y, Shiosaka S, Ohta J. An in vitro demonstration of CMOS-based optoelectronic neural interface device for optogenetics. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2013:799-802. [PMID: 24109808 DOI: 10.1109/embc.2013.6609621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A CMOS-based neural interface device equipped with an integrated micro light source array for optogenetics was fabricated and demonstrated. A GaInN LED array formed on sapphire substrate was successfully assembled with a multifunctional CMOS image sensor that is capable of on-chip current injection. We demonstrated a functionality of light stimulation onto ChR2-expressed cells in an in vitro experiment. A ChR2-expressed cell were successfully stimulated with the light emitted from the fabricated device.
Collapse
|
19
|
Tokuda T, Ito T, Kitao T, Noda T, Sasagawa K, Terasawa Y, Tashiro H, Kanda H, Fujikado T, Ohta J. CMOS-based smart-electrode-type retinal stimulator with bullet-shaped bulk Pt electrodes. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2011:6733-6. [PMID: 22255884 DOI: 10.1109/iembs.2011.6091661] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A CMOS-based flexible retinal stimulator equipped with bullet-shaped bulk Pt electrodes was fabricated and demonstrated. We designed a new CMOS unit chip with an on-chip stimulator, single- and multi-site stimulation modes, and monitoring functions. We have developed a new structure and packaging process of flexible retinal stimulator with bullet-type bulk Pt electrode. We have confirmed the retinal stimulation functionality in an in vivo stimulation trial on rabbit's retina.
Collapse
Affiliation(s)
- T Tokuda
- Graduate School of MateriL Science, Nara Institute of Science and Technology, Ikoma, Nara, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Watanabe Y, Tatebe H, Tokuda T, Mizuno T, Nakagawa M, Tanaka M. 3.303 INTRACELLULAR AND EXTRACELLULAR MECHANISM OF α-SYNUCLEIN METABOLISM. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70937-3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
21
|
Tokuda T, Takeuchi Y, Sagawa Y, Noda T, Sasagawa K, Nishida K, Fujikado T, Ohta J. Development and in vivo Demonstration of CMOS-Based Multichip Retinal Stimulator With Simultaneous Multisite Stimulation Capability. IEEE Trans Biomed Circuits Syst 2010; 4:445-453. [PMID: 23853382 DOI: 10.1109/tbcas.2010.2078508] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A complementary metal-oxide semiconductor (CMOS)-based multichip flexible neural stimulator for retinal prostheses was developed. The multichip retinal stimulator is capable of simultaneous multisite stimulation. An on-chip stimulation generator was implemented on the "unit chip," which is the core device of the multichip retinal stimulator. The performance of the CMOS circuitry was characterized. A new device structure and packaging process was developed. The in vivo retinal stimulation on a rabbit's retina was successfully performed and the multisite stimulation functionality was confirmed.
Collapse
|
22
|
Tokuda T, Qureshi MM, Ardah MT, Varghese S, Shehab SAS, Kasai T, Ishigami N, Tamaoka A, Nakagawa M, El-Agnaf OMA. Detection of elevated levels of α-synuclein oligomers in CSF from patients with Parkinson disease. Neurology 2010; 75:1766-72. [PMID: 20962290 DOI: 10.1212/wnl.0b013e3181fd613b] [Citation(s) in RCA: 375] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND To date, there is no accepted clinical diagnostic test for Parkinson disease (PD) that is based on biochemical analysis of blood or CSF. The discovery of mutations in the SNCA gene encoding α-synuclein in familial parkinsonism and the accumulation of α-synuclein in the PD brain suggested a critical role for this protein in PD etiology. METHODS We investigated total and α-synuclein oligomers levels in CSF from patients clinically diagnosed with PD, progressive supranuclear palsy (PSP), or Alzheimer disease (AD), and age-matched controls, using ELISA developed in our laboratory. RESULTS The levels of α-synuclein oligomers and oligomers/total-α-synuclein ratio in CSF were higher in the PD group (n = 32; p < 0.0001, Mann-Whitney U test) compared to the control group (n = 28). The area under the receiver operating characteristic curve (AUC) indicated a sensitivity of 75.0% and a specificity of 87.5%, with an AUC of 0.859 for increased CSF α-synuclein oligomers in clinically diagnosed PD cases. However, when the CSF oligomers/total-α-synuclein ratio was analyzed, it provided an even greater sensitivity of 89.3% and specificity of 90.6%, with an AUC of 0.948. In another cross-sectional pilot study, we confirmed that the levels of CSF α-synuclein oligomers were higher in patients with PD (n = 25) compared to patients with PSP (n = 18; p < 0.05) or AD (n = 35; p < 0.001) or control subjects (n = 43; p < 0.05). CONCLUSION Our results demonstrate that levels of α-synuclein oligomers in CSF and the oligomers/total-α-synuclein ratio can be useful biomarkers for diagnosis and early detection of PD.
Collapse
Affiliation(s)
- T Tokuda
- Department of Neurology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Hirohata M, Yoshita M, Ishida C, Ikeda SI, Tamaoka A, Kuzuhara S, Shoji M, Ando Y, Tokuda T, Yamada M. Clinical features of non-hypertensive lobar intracerebral hemorrhage related to cerebral amyloid angiopathy. Eur J Neurol 2010; 17:823-9. [PMID: 20158508 DOI: 10.1111/j.1468-1331.2009.02940.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND PURPOSE The present study aims to clarify the clinical features of non-hypertensive cerebral amyloid angiopathy-related lobar intracerebral hemorrhage (CAA-L-ICH). METHODS We investigated clinical, laboratory, and neuroimaging findings in 41 patients (30, women; 11, men) with pathologically supported CAA-L-ICH from 303 non-hypertensive Japanese patients aged >OR=55, identified via a nationwide survey as symptomatic CAA-L-ICH. RESULTS The mean age of patients at onset of CAA-L-ICH was 73.2 +/- 7.4 years; the number of patients increased with age. The corrected female-to-male ratio for the population was 2.2, with significant female predominance. At onset, 7.3% of patients received anti-platelet therapy. In brain imaging studies, the actual frequency of CAA-L-ICHs was higher in the frontal and parietal lobes; however, after correcting for the estimated cortical volume, the parietal lobe was found to be the most frequently affected. CAA-L-ICH recurred in 31.7% of patients during the average 35.3-month follow-up period. The mean interval between intracerebral hemorrhages (ICHs) was 11.3 months. The case fatality rate was 12.2% at 1 month and 19.5% at 12 months after initial ICH. In 97.1% of patients, neurosurgical procedures were performed without uncontrollable intraoperative or post-operative hemorrhage. CONCLUSIONS Our study revealed the clinical features of non-hypertensive CAA-L-ICH, including its parietal predilection, which will require further study with a larger number of patients with different ethnic backgrounds.
Collapse
Affiliation(s)
- M Hirohata
- Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Tanigawa N, Kariya S, Tokuda T, Nakatani M, Yagi R, Komemushi A, Sawada S. Abstract No. 14: Prospective analysis of respiratory function following percutaneous vertebroplasty for osteoporotic compression fractures. J Vasc Interv Radiol 2010. [DOI: 10.1016/j.jvir.2009.12.156] [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: 11/28/2022] Open
|
25
|
Tokuda T, Sagawa Y, Noda T, Sasagawa K, Nishida K, Fujikado T, Ohta J. A CMOS-based multichip flexible retinal stimulator for simultaneous multi-site stimulation. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2010:5883-5886. [PMID: 21096930 DOI: 10.1109/iembs.2010.5627531] [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] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We developed a novel CMOS-based multichip flexible neural stimulator with on-chip stimulation generator. It enables simultaneous multi-site stimulation. We also propose a new type of multi-chip retinal stimulator with single electrode / unit chip configuration. We successfully performed simultaneous multi-site stimulation in an in vivo retinal stimulation experiment using a rabbit.
Collapse
Affiliation(s)
- T Tokuda
- Nara Institute Science and Technology, Takayama-cho 8916-5, Ikoma, 630-0192, JAPAN.
| | | | | | | | | | | | | |
Collapse
|
26
|
Tokuda T, El-Agnaf O. P2.023 Detection of a-synuclein oligomers in CSF from Parkinson's disease patients. Parkinsonism Relat Disord 2009. [DOI: 10.1016/s1353-8020(09)70374-8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
27
|
Tokuda T, Yamada H, Sasagawa K, Ohta J. Polarization-Analyzing CMOS Image Sensor With Monolithically Embedded Polarizer for Microchemistry Systems. IEEE Trans Biomed Circuits Syst 2009; 3:259-266. [PMID: 23853264 DOI: 10.1109/tbcas.2009.2022835] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This paper proposes and demonstrates a polarization-analyzing CMOS sensor based on image sensor architecture. The sensor was designed targeting applications for chiral analysis in a microchemistry system. The sensor features a monolithically embedded polarizer. Embedded polarizers with different angles were implemented to realize a real-time absolute measurement of the incident polarization angle. Although the pixel-level performance was confirmed to be limited, estimation schemes based on the variation of the polarizer angle provided a promising performance for real-time polarization measurements. An estimation scheme using 180 pixels in a 1deg step provided an estimation accuracy of 0.04deg. Polarimetric measurements of chiral solutions were also successfully performed to demonstrate the applicability of the sensor to optical chiral analysis.
Collapse
|
28
|
Shomura Y, Tanigawa N, Tokuda T, Kariya S, Kojima H, Komemushi A, Sawada S. Composite material stent comprising metallic wire and polylactic acid fibers, and its mechanical strength and retrievability. Acta Radiol 2009; 50:355-9. [PMID: 19306137 DOI: 10.1080/02841850902774600] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND Although metallic stents are characterized by strong expanse of force, thin walls, and easy stent deployment, their removal from the body is usually difficult or impossible due to the difficulty of unraveling their mesh structure. A stent built of a composite material comprising a metallic wire and a polylactic acid (PLA) fiber, in which the metallic wire component could be unraveled after PLA fiber degradation in the body, should allow easy stent removal. PURPOSE To evaluate the mechanical strength and retrievability of a composite material stent comprising a metallic wire and a PLA fiber. MATERIAL AND METHODS We produced a composite material stent comprising a metallic wire and a biodegradable fiber (hybrid stent). As the metallic wire is not cross-linked with itself, but with the PLA fibers only, the hybrid stent can be easily unraveled after PLA fiber degradation. This stent was built with a 0.2-mm stainless-steel wire and a 0.23-mm PLA fiber knitted in the same textile as an Ultraflex stent. For comparison, an identical stent was built using PLA fiber only (PLA stent). The mechanical strength of these stents was tested by the radial expansive force response against circumferential shrinkage stress load. Change in radial force due to PLA fiber degradation was estimated by adding an artificial PLA degeneration process, by immersing each stent in a water bath at 80 degrees C for 48 hours. Retrievability of the hybrid stent after PLA degeneration was examined by hooking and pulling out the residual stainless-steel wire from a silicon tube. RESULTS The hybrid stent exhibited a linear response in radial expansive force within the range of 15% diameter reduction. The PLA stent did not exhibit linear response at over 15% diameter reduction. Decrease of radial expansive force after PLA degradation was within 5% of the original force in the hybrid stent, but the PLA stent did not create effective radial expansive force. Hybrid stents, even after PLA degradation, exhibited a linear response in radial expansive force, within the range of 15% diameter reduction. The metallic component of the heat-processed hybrid stent was easily unraveled by pulling out the wire. CONCLUSION The hybrid stent comprising a stainless-steel wire and a PLA fiber appears to provide effective radial expansive force and retrievability.
Collapse
Affiliation(s)
- Y. Shomura
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| | - N. Tanigawa
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| | - T. Tokuda
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| | - S. Kariya
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| | - H. Kojima
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| | - A. Komemushi
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| | - S. Sawada
- Department of Radiology, Kansai Medical University, Hirakata Hospital, Osaka, Japan
| |
Collapse
|
29
|
Hagiwara K, Ochi H, Suzuki S, Shimizu Y, Tokuda T, Murai H, Shigeto H, Ohyagi Y, Iwata M, Iwaki T, Kira JI. Highly selective leptomeningeal amyloidosis with transthyretin variant Ala25Thr. Neurology 2009; 72:1358-60. [PMID: 19365058 DOI: 10.1212/wnl.0b013e3181a0fe74] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- K Hagiwara
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Tanigawa N, Kariya S, Komemushi A, Shomura Y, Tokuda T, Sawada S. Abstract No. 4: Percutaneous Vertebroplasty for Osteoporotic Compression Fracture, First 500 Levels of a Single Center: Long Term Evaluation of the Technical and Clinical Outcomes. J Vasc Interv Radiol 2009. [DOI: 10.1016/j.jvir.2008.12.005] [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: 11/26/2022] Open
|
31
|
Tokuda T, Asano R, Hiyama K, Terasawa Y, Nishida K, Kitaguchi Y, Fujikado T, Tano Y, Ohta J. Multi-finger structure and pulsed-powering operation scheme for CMOS LSI-based flexible stimulator for retinal prosthesis. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2008:4212-5. [PMID: 19163641 DOI: 10.1109/iembs.2008.4650138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Multi-finger structure was proposed to improve flexibility of the CMOS LSI-based multi-chip retinal stimulator. A dual-finger retinal stimulator was fabricated and its functionality was demonstrated in retinal stimulation experiments on rabbit's retina, We also proposed an idea of pulsed-powering operation scheme for the multi-chip flexible retinal stimulator. We compared the pulsed-powering scheme with conventional one in a simulation, and show that the pulsed-powering can be an alternative operation scheme for the neural stimulator that provides an improved safety to the biological tissue.
Collapse
Affiliation(s)
- T Tokuda
- Nara Institute Science and Technology, Takayama-cho 8916-5, Ikoma 630-0192, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Tokuda T, Takeuchi Y, Noda T, Sasagawa K, Nishida K, Kitaguchi Y, Fujikado T, Tano Y, Ohta J. Light-controlled retinal stimulation on rabbit using CMOS-based flexible multi-chip stimulator. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2009:646-649. [PMID: 19964235 DOI: 10.1109/iembs.2009.5333809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We implemented a light-sensing function on CMOS-based multi-chip stimulator for retinal prosthesis. Using the light-sensing circuitry attached to each stimulation electrode, the flexible multi-chip stimulator is capable of image-based patterned stimulation. We verified the function of the light-controlled decision based on the light intensity measured just beside the stimulation site. We also experimentally demonstrated in vivo retinal stimulation on rabbit's retina with light-controlled decision. The result of the present work is a simplified demonstration for the concept of retinal prosthesis with on-site imaging.
Collapse
Affiliation(s)
- T Tokuda
- Nara Institute Science and Technology, Takayama-cho 8916-5, Ikoma, Nara, 630-0192, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Tanigawa N, Kariya S, Kojima H, Komemushi A, Shomura Y, Tokuda T, Ueno Y, Kuwata S, Fujita A, Terada J, Sawada S. Improvement in respiratory function by percutaneous vertebroplasty. Acta Radiol 2008; 49:638-43. [PMID: 18568555 DOI: 10.1080/02841850802010758] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
BACKGROUND Percutaneous vertebroplasty (PVP) improves back pain and corrects spinal misalignment to some extent, and thus may improve respiratory function. PURPOSE To retrospectively investigate changes in respiratory function after PVP. MATERIAL AND METHODS 41 patients (mean age 72.0 years, range 59-86 years; 39 women, two men) who had undergone PVP for vertebral compression fractures (37 thoracic vertebral bodies [Th6-Th12] and 50 lumbar vertebral bodies [L1-L5]) caused by osteoporosis visited our hospital for follow-up consultation between January and June 2005. At this follow-up consultation, respiratory function testing, including percent forced vital capacity (FVC%) and percent forced expiratory volume in 1 s (FEV(1)%), was performed. We retrospectively compared these values with those taken before PVP using a Wilcoxon signed-rank test. RESULTS FVC% was 85.2+/-30.3% before PVP and 91.5+/-16.8% at follow-up (mean 10 months after PVP), which represented a significant difference (P<0.003). No significant difference in FEV(1)% was detected. Regarding the number of treatment levels, that is, single vertebroplasty versus multiple vertebroplasty, no significant difference in improvement of FVC% was confirmed (P=0.1). FVC% was abnormally low (<or=79%) before PVP in 16 patients and improved to within normal range postoperatively in six of these patients (38%). CONCLUSION PVP improves preoperatively decreased lung function, but this improvement takes time.
Collapse
Affiliation(s)
- N. Tanigawa
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - S. Kariya
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - H. Kojima
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - A. Komemushi
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - Y. Shomura
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - T. Tokuda
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - Y. Ueno
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - S. Kuwata
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - A. Fujita
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - J. Terada
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| | - S. Sawada
- Department of Radiology, Kansai Medical University Hirakata Hospital, Osaka, Japan; Department of Radiology, Kansai Medical University Takii Hospital, Osaka, Japan
| |
Collapse
|
34
|
Tokuda T, Asano R, Sugitani S, Terasawa Y, Nunoshita M, Nakauchi K, Fujikado T, Tano Y, Ohta J. In vivo stimulation on rabbit retina using CMOS LSI-based multi-chip flexible stimulator for retinal prosthesis. ACTA ACUST UNITED AC 2008; 2007:5791-4. [PMID: 18003329 DOI: 10.1109/iembs.2007.4353663] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We have performed in vivo electric stimulation experiments on rabbit retina to demonstrate feasibility of CMOS LSI-based multi-chip flexible neural stimulator for retinal prosthesis. We have developed new packaging structure with an improved flexibility and device control system which totally controls the LSI-based multi-chip stimulator, counter electrode, and stimulation generator. We have implanted the fabricated multi-chip stimulator into sclera pocket for STS (Suprachoroidal Transretinal Stimulation) configuration. We successfully obtained EEP (Electrically Evoked Potential) on visual cortex evoked by the multi-chip stimulator.
Collapse
Affiliation(s)
- T Tokuda
- Nara Institute Science and Technology, Takayama-cho 8916-5, Ikoma, Nara, 630-0192, JAPAN.
| | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Nomura M, Komemushi A, Kamata M, Tanigawa N, Hori Y, Sawada S, Arakawa M, Nakashuji M, Kariya S, Kojima H, Shomura Y, Tokuda T, Terada J. Abstract No. 180: Does Bone Cement Injected to Vertebra Affect Radiotherapy Dose Distribution? J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
36
|
Ohta J, Tokuda T, Kagawa K, Sugitani S, Taniyama M, Uehara A, Terasawa Y, Nakauchi K, Fujikado T, Tano Y. Laboratory investigation of microelectronics-based stimulators for large-scale suprachoroidal transretinal stimulation (STS). J Neural Eng 2007; 4:S85-91. [PMID: 17325420 DOI: 10.1088/1741-2560/4/1/s10] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This paper describes the technological developments underlying the realization of a reliable and reproducible microchip-based stimulator with a large number of stimulus electrodes. A microchip-based stimulator with over 500 electrodes for suprachoroidal transretinal stimulation (STS) is proposed in this paper, and an example is presented. To enhance reliability and reproducibility for such a large array, we introduce a flip-chip bonding technique and place microchips on the reverse side of a substrate. A square microchip of size 600 microm was fabricated using 0.35 microm standard CMOS process technology. Twelve microchips were flip-chip bonded on a polyimide substrate through Au bumps. To evaluate the feasibility of the proposed device, we successfully fabricated a stimulator with 12 microchips and 118 electrodes made of Pt/Au bumps, and demonstrated their operation in a saline solution for 2 weeks. Also, to evaluate the device operation in vivo, a stimulator with one active IrO(x) electrode was implanted into the scleral pocket of a rabbit and electrical evoked potential (EEP) signals with a threshold of 100 microA were obtained. We also fabricated a simulator with 64 microchips that has 576 electrodes (9 electrodes in a microchip times 64 microchips).
Collapse
Affiliation(s)
- J Ohta
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Yazaki M, Mitsuhashi S, Tokuda T, Kametani F, Takei YI, Koyama J, Kawamorita A, Kanno H, Ikeda SI. Progressive wild-type transthyretin deposition after liver transplantation preferentially occurs onto myocardium in FAP patients. Am J Transplant 2007; 7:235-42. [PMID: 17061984 DOI: 10.1111/j.1600-6143.2006.01585.x] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [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: 01/25/2023]
Abstract
To elucidate whether progressive wild-type transthyretin (TTR) deposition can actually occur after liver transplantation (LT), amyloid fibrils were investigated in two familial amyloid polyneuropathy patients with TTR Val30Leu variant, who died 1 year after LT. Amyloid fibrils were extracted from cardiac muscles, sciatic nerves and kidney, which were investigated by the immunoprecipitation-mass spectrometry method and liquid chromatography-ion trap mass spectrometry analysis. The ratio of wild-type to variant TTR in cardiac muscle was approximately 5:5 before LT, but greatly increased to about 9:1 after transplantation. The ratios in sciatic nerves and kidney obtained at autopsy were approximately 5:5. Wild-type TTR was undetectable in kidney amyloid obtained before LT. Our results indicate that paradoxical wild-type TTR deposition after LT can preferentially occur in myocardium, leading to fatal cardiac dysfunction, but it is quite likely that this phenomenon can also occur in other visceral organs.
Collapse
Affiliation(s)
- M Yazaki
- Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Watano S, Tokuda T, Nakamura H. Wet granulation of nano-particles in a rotating fluidized bed. New Developments and Application in Chemical Reaction Engineering 2006. [DOI: 10.1016/s0167-2991(06)81639-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
39
|
Tokuda T, Kawada M, Sugitani S, Taniyama M, Uehara A, Kagawa K, Nunoshita M, Ohta J. A multi-chip-architecture based flexible stimulation device for retinal prosthesis with a flip-chip packaging technique. Conf Proc IEEE Eng Med Biol Soc 2006; 2006:2920-2923. [PMID: 17946150 DOI: 10.1109/iembs.2006.260794] [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] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In the present work, we designed a multi-chip-architecture based flexible neural stimulation device for retinal prosthesis. Based on the multi-chip architecture, a novel CMOS stimulation device was successfully designed and characterized. A packaging technique for thin, flexible neural stimulation device was also proposed and demonstrated. Flip-chip bonding technology plays an essential role in the fabrication of the present thin and flexible neural stimulation device.
Collapse
Affiliation(s)
- T Tokuda
- Nara Inst. of Sci. & Technol., Nara, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Tokuda T, Delavaud C, Chilliard Y. Comparative study of plasma leptin concentration
between ruminal and abomasal feeding in sheep. J Anim Feed Sci 2004. [DOI: 10.22358/jafs/73964/2004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
41
|
Oide T, Ohara S, Oguchi K, Maruyama M, Yazawa M, Inoue K, Sekijima Y, Tokuda T, Ikeda S. Remitting seronegative symmetrical synovitis with pitting edema (RS3PE) syndrome in Nagano, Japan: clinical, radiological, and cytokine studies of 13 patients. Clin Exp Rheumatol 2004; 22:91-8. [PMID: 15005010] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
OBJECTIVE Remitting seronegative symmetrical synovitis with pitting edema (RS3PE) has so far been reported almost exclusively from the USA and Europe. We carried out this study to define the clinical characteristics of this syndrome in Japanese patients. METHODS Prospectively, we identified 13 Japanese patients with RS3PE (5 men and 8 women, age 72.7 +/- 11.8 years (mean +/- SD)) without underlying neoplasm. Their clinical features were summarized, pertinent laboratory data including serum/synovial interleukin-6 (IL-6) concentrations were obtained, and extensive radiologic studies using magnetic resonance imaging and 67gallium-citrate (67Ga) whole body scintigram were performed. RESULTS All patients suffered from proximal arthralgia/myalgia in addition to typical distal symptoms of RS3PE, and all experienced systemic symptoms such as fever, malaise, and weight loss. In laboratory examinations, anemia and elevated inflammatory markers were often remarkable. Magnetic resonance imaging showed severe tenosynovitis of the hands. 67Ga-scintigram revealed radioisotope accumulation in both proximal and distal joints of the extremities. IL-6 activity was markedly elevated both in the serum (mean 82.4 +/- 62.1 (SD) pg/ml, normal range 0.157-2.94) and in the synovial fluid (mean 3350 +/- 633 (SD) pg/ml). CONCLUSION Compared with cases reported previously from the USA/Europe, Japanese patients with RS3PE are characterized by more prominent systemic symptoms/signs associated with marked inflammatory responses including elevated IL-6 activity. All patients had proximal as well as distal synovitis which could be demonstrated by 67Ga-scintigram. These clinical features were very similar to those of polymyalgia rheumatica, suggesting that RS3PE and polymyalgia rheumatica are closely related disorders which may have a common pathogenesis.
Collapse
Affiliation(s)
- T Oide
- Third Department of Medicine, Shinshu University School of Medicine, Department of Neurology, National Chushin-Matsumoto Hospital, Matsumoto, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Tokuda T, Shinde S. Plasma leptin concentration during 45 days in
pre-weaning Japanese Black and Holstein calves. J Anim Feed Sci 2003. [DOI: 10.22358/jafs/67764/2003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
43
|
Yonekura H, Yamamoto Y, Sakurai S, Watanabe T, Li H, Kim CH, Myint KM, Tokuda T, Tsuchiya F, Sagara A, Yamamoto H. 1P-0160 Regulations of human RAGE as potential target in diabetes-induced vascular injury. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90234-0] [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: 11/30/2022]
|
44
|
Tokuda T, Oide T, Tamaoka A, Ishii K, Matsuno S, Ikeda S. Prednisolone (30-60 mg/day) for diseases other than AD decreases amyloid beta-peptides in CSF. Neurology 2002; 58:1415-8. [PMID: 12011295 DOI: 10.1212/wnl.58.9.1415] [Citation(s) in RCA: 13] [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: 11/15/2022] Open
Abstract
The effect of corticosteroid on the concentration of amyloid beta-peptide (Abeta) in human CSF obtained from 16 patients without dementia treated with prednisolone (> or =30 mg daily) was studied. The concentrations of Abetax-40 and Abetax-42 in CSF decreased after treatment was started (p < 0.002). A moderate- or high-dose regimen of prednisolone decreases Abeta production or increases Abeta degradation in the human brain and deserves further study in AD.
Collapse
Affiliation(s)
- T Tokuda
- Third Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
| | | | | | | | | | | |
Collapse
|
45
|
Abstract
Although dissociation of the transthyretin (TTR) tetramer is suspected of being the first step in amyloid fibril formation in hereditary TTR amyloidosis, including familial amyloid polyneuropathy (FAP), the TTR monomer has never been examined in vivo. Therefore, we analyzed the TTR monomer in the serum of FAP patients and normal individuals. Free TTR monomer was detected in both groups using gel filtration chromatography and immunoblotting. Both the mean concentration of free TTR monomer and the total serum TTR were significantly lower in FAP patients than in normal individuals. Moreover, in FAP patients, mass spectrometry showed that the variant TTR monomer was markedly decreased compared with the wild-type TTR monomer. These findings suggest that the free variant TTR monomer is unstable in serum, and that it aggregates in deposits in various organs or is adsorbed by preexisting amyloid fibrils before it is degraded
Collapse
Affiliation(s)
- Y Sekijima
- Department of Molecular Biology, Tokyo Institute of Psychiatry, Japan
| | | | | | | | | | | |
Collapse
|
46
|
Mochizuki H, Kamakura K, Masaki T, Hirata A, Tokuda T, Yazaki M, Motoyoshi K, Ikeda S. Nodular cutaneous amyloidosis and carpal tunnel syndrome due to the amyloidogenic transthyretin His 114 variant. Amyloid 2001; 8:105-10. [PMID: 11409031 DOI: 10.3109/13506120109007352] [Citation(s) in RCA: 14] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This is the second report of transthyretin (TTR) amyloidosis in a patient who had ATTR Tyr114His diagnosed by mass spectrometry and gene analysis. This case had some clinical features that differed from those of the first reported cases. The patient, 73-year-old man, complained of generalized cutaneous tubercula that had started at age 68. These tubercula gradually increased in size and became generalized. He felt a slight numbness in his extremities. Clinical and electrophysiological examinations revealed that he had bilateral carpal tunnel syndrome (CTS), whereas there was no clear evidence of sensory and/or motor polyneuropathy. Autonomic symptoms were not present. Biopsy studies revealed that both his tuberculum and his sural nerve contained TTR-related amyloid. In his sural nerve, amyloid deposits were observed mainly in the perineurium, not in the endoneurium, and there was no significant depletion of myelinated fibers. The features of this patient were clinically characterized by generalized cutaneous amyloid deposits and late-onset CTS with a lack of overt polyneuropathy and autonomic dysfunction. The unique clinical features in this case seemed to be consistent with the distribution of amyloid deposits.
Collapse
Affiliation(s)
- H Mochizuki
- Third Department of Internal Medicine, National Defense Medical College, 3-2, Namiki, Tokorozawa, Saitama 359-8513, Japan
| | | | | | | | | | | | | | | |
Collapse
|
47
|
Tokuda T, Tamaoka A, Matsuno S, Sakurai S, Shimada H, Morita H, Ikeda S. Plasma levels of amyloid beta proteins did not differ between subjects taking statins and those not taking statins. Ann Neurol 2001. [PMID: 11310640 DOI: 10.1002/ana.112] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
48
|
Sekijima Y, Ikeda S, Tokuda T, Satoh S, Hidaka H, Hidaka E, Ishikawa M, Yanagisawa N. Prevalence of dementia of Alzheimer type and apolipoprotein E phenotypes in aged patients with Down's syndrome. Eur Neurol 2000; 39:234-7. [PMID: 9635475 DOI: 10.1159/000007940] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [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: 11/19/2022]
Abstract
We investigated the exact prevalence of dementia of Alzheimer type (DAT) and apolipoprotein E (ApoE) phenotypes in 106 Japanese Down's syndrome (DS) patients. Among these patients 16 were diagnosed as having DAT. The prevalence of DAT was 0% in the 30- to 39-year-old group, 16% in the 40- to 49-year-old group, and 38% in those over 50 years old. The frequency of the epsilon4 allele in DS patients with DAT was 18.8%, which was considerably higher than that of nondemented DS patients (4.5%) and Japanese nondemented controls (6.7%). Especially, the frequency of the epsilon4 allele in DS patients who developed DAT under 50 years was significantly higher (28.6%). DS patients certainly develop DAT at earlier ages but the prevalence of DAT in each group of patients was lower than previously recognized. It is very likely that the ApoE epsilon4 is a risk factor for DAT even in DS patients with a genetic predisposition to Alzheimer's disease.
Collapse
Affiliation(s)
- Y Sekijima
- Department of Medicine (Neurology), Shinshu University School of Medicine, Asahi, Matsumoto, Japan
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Ishikawa S, Ishikawa M, Tokuda T, Yoshida K, Wakui K, Matsuura S, Ohara S, Sekijima Y, Hidaka E, Fukushima Y, Shigeta H, Komatsu K, Ikeda S. Japanese family with an autosomal dominant chromosome instability syndrome: a new neurodegenerative disease? Am J Med Genet 2000; 94:265-70. [PMID: 11038437 DOI: 10.1002/1096-8628(20001002)94:4<265::aid-ajmg1>3.0.co;2-#] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/15/2023]
Abstract
We report on a Japanese family having an autosomal dominant neurodegenerative disease with chromosomal instability and radiosensitivity. Clinical manifestations of affected members included short stature, osteoporosis, severe dental caries, and various neurological abnormalities, such as mental retardation, depression, dysarthria, hyperreflexia, and ataxic gait. MRI demonstrated a markedly atrophic spinal cord and degeneration of the white matter. Cytogenetic examination showed spontaneous chromosome rearrangements at 14q11.2 and hypersensitivity to radiation and bleomycin. The degree of these cytogenetic abnormalities was significantly higher in the patients than in normal controls but lower than in patients with ataxia telangiectasia or Nijmegen breakage syndrome. Moreover, genetic anticipation was observed in this family: the age of disease onset became earlier, MRI abnormalities more extensive, and the chromosome hypersensitivity to radiation increased in successive generations. We speculate that a basic defect in this family is a mutation in the gene that is responsible for DNA double-strand breakage repair.
Collapse
Affiliation(s)
- S Ishikawa
- Department of Medicine (Neurology), Shinshu University School of Medicine, Matsumoto, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Miravalle L, Tokuda T, Chiarle R, Giaccone G, Bugiani O, Tagliavini F, Frangione B, Ghiso J. Substitutions at codon 22 of Alzheimer's abeta peptide induce diverse conformational changes and apoptotic effects in human cerebral endothelial cells. J Biol Chem 2000; 275:27110-6. [PMID: 10821838 DOI: 10.1074/jbc.m003154200] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cerebral amyloid angiopathy is commonly associated with normal aging and Alzheimer's disease and it is also the principal feature of hereditary cerebral hemorrhage with amyloidosis Dutch type, a familial condition associated to a point mutation G to C at codon 693 of the amyloid beta (Abeta) precursor protein gene resulting in a Glu to Gln substitution at position 22 of the Abeta (E22Q). The patients carrying the AbetaE22Q variant usually present with lobar cerebral hemorrhages before 50 years of age. A different mutation described in several members of three Italian kindred who presented with recurrent hemorrhagic strokes late in life, between 60 and 70 years of age, also associated with extensive cerebrovascular amyloid deposition has been found at the same position 22, this time resulting in a Glu to Lys substitution (E22K). We have compared the secondary structure, aggregation, and fibrillization properties of the two Abeta40 variants and the wild type peptide. Using flow cytometry analysis after staining with propidium iodide and annexin V, we also evaluated the cytotoxic effects of the peptides on human cerebral endothelial cells in culture. Under the conditions tested, the E22Q peptide exhibited the highest content of beta-sheet conformation and the fastest aggregation/fibrillization properties. The Dutch variant also induced apoptosis of cerebral endothelial cells at a concentration of 25 micrometer, whereas the wild type Abeta and the E22K mutant had no effect. The data suggest that different amino acids at position 22 confer distinct structural properties to the peptides that appear to influence the onset and aggressiveness of the disease rather than the phenotype.
Collapse
Affiliation(s)
- L Miravalle
- Department of Pathology, New York University School of Medicine, New York, New York 10016, USA
| | | | | | | | | | | | | | | |
Collapse
|