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Inukai D, Yokoi H, Yamanaka S, Nakamura H, Maruo T, Ogawa T, Kondo K, Lee Y, Nakamura K, Fujimoto Y. Dynamic Analysis Of Male "Extra-high Voice" Using Multi-row Detector Computed Tomography. J Voice 2023:S0892-1997(23)00234-5. [PMID: 37730488 DOI: 10.1016/j.jvoice.2023.07.025] [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: 05/28/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 09/22/2023]
Abstract
OBJECTIVES/HYPOTHESIS Some people who practice singing on a daily basis may be able to produce a voice higher than the upper limit of the normal range (extra high voice), but there is much regarding the movement of the larynx that remains unknown. We have been conducting dynamic analysis of the larynx using multi-row detection computed tomography (MD-CT) at our university and report herein an analysis of the extra high voice. STUDY DESIGN Observational. METHODS Images of a normal male participant capable of extremely high-frequency speech (the highest speech range is C7 [2093 Hz] and the singing application range is up to B5 [988 Hz]) during speech were captured by MD-CT. The acquisition time was 2 seconds, and the rise of the voice from low to high and then to very high tones was recorded. Ten frames per second were analyzed as three-dimensional images. RESULTS In the fundamental frequency range from A3 to D5 (220-587 Hz), laryngeal elevation movements were observed as the voice rose in pitch. However, posterior upward displacement of the laryngeal cartilage was observed as the frequency range increased from E5 to B5 (659-988 Hz). CONCLUSIONS In the E5-B5 range, laryngeal movements were different from those observed in the previous range. MD-CT analysis is useful in the study of this range because it allows visualization of laryngeal movements that are unclear using endoscopy or external examination.
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Affiliation(s)
- Daisuke Inukai
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan.
| | - Hiroki Yokoi
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
| | - Shumpei Yamanaka
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
| | - Hiromu Nakamura
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
| | - Takashi Maruo
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
| | - Tetsuya Ogawa
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
| | - Kenichi Kondo
- Central Radiation Division, Aichi Medical University Hospital, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
| | - Yogaku Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Kyushu University School of Medicine, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kazuhiro Nakamura
- Department of Otorhinolaryngology-Head and Neck Surgery, Japan University School of Medicine, Oyaguchi-kamimachi 30-1, Itabashi-ku, Tokyo 173-8610, Japan
| | - Yasushi Fujimoto
- Department of Otorhinolaryngology-Head and Neck Surgery, Aichi Medical University School of Medicine, Yazakokarimata 1-1, Nagakute, Aichi 480-1195, Japan
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Miyagawa K, Yamanaka S, Isobe H, Shoji M, Kawakami T, Taniguchi M, Okumura M, Yamaguchi K. Electronic and spin structures of CaMn 4O x clusters in the S 0 state of the oxygen evolving complex of photosystem II. Domain-based local pair natural orbital (DLPNO) coupled-cluster (CC) calculations using optimized geometries and natural orbitals (UNO) by hybrid density functional theory (HDFT) calculations. Phys Chem Chem Phys 2021; 22:27191-27205. [PMID: 33226053 DOI: 10.1039/d0cp04762g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Domain-based local pair natural orbital (DLPNO) coupled cluster single and double (CCSD) with triple perturbation (T) correction methods were performed to elucidate the relative stabilities of ten different intermediate structures of the CaMn4Ox cluster in the S0 state of the oxygen evolving complex (OEC) of photosystem II (PSII). Full geometry optimizations of all the S0 intermediates were performed by the UB3LYP-D3/Def2-TZVP methods, providing the assumed geometrical structures and starting natural orbitals (UNO) for DLPNO-CCSD(T)/Def2TZVP calculations. The effective exchange integrals (J) for the spin Hamiltonian models for the ten intermediates were obtained by the UB3LYP/Def2-TZVP calculations followed by the general spin projections. DLPNO-CCSD(T) calculations followed by the CBS extrapolation procedure elucidated that the (II, III, IV, IV) and (III, III, III, IV) valence states in the CaMn4O5 cluster of the OEC of the PS II were nearly degenerated in energy in the S0 state, indicating an important role of dynamical electron correlation effects for the valence and spin fluctuations in strongly correlated electron systems (SCESs) consisting of 3d transition metals.
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Affiliation(s)
- K Miyagawa
- Institute for Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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Miyagawa K, Kawakami T, Suzuki Y, Isobe H, Shoji M, Yamanaka S, Okumura M, Nakajima T, Yamaguchi K. Relative stability among intermediate structures in S2 state of CaMn4O5 cluster in PSII by using hybrid-DFT and DLPNO-CC methods and evaluation of magnetic interactions between Mn ions. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.112923] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yamaguchi K, Yamanaka S, Isobe H, Shoji M, Miyagawa K, Kawakami T. Theory of chemical bonds in metalloenzymes XXIII fundamental principles for the photo-induced water oxidation in oxygen evolving complex of photosystem II. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1725168] [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] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- K. Yamaguchi
- The Institute for Scientific and Industrial Research, Osaka University, Osaka, Japan
- Graduate School of Science, Osaka University, Toyonaka, Japan
- RIKEN Center for Computational Science, Kobe, Japan
- Institute for Nanoscience Design, Osaka University, Toyonaka, Japan
- Division of Quantum Information and Quantum Biology (QIQB), Osaka University, Toyonaka, Japan
| | - S. Yamanaka
- Graduate School of Science, Osaka University, Toyonaka, Japan
- Division of Quantum Information and Quantum Biology (QIQB), Osaka University, Toyonaka, Japan
| | - H. Isobe
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - M. Shoji
- Center of Computational Sciences, Tsukuba University, Tsukuba, Japan
| | - K. Miyagawa
- The Institute for Scientific and Industrial Research, Osaka University, Osaka, Japan
| | - T. Kawakami
- Graduate School of Science, Osaka University, Toyonaka, Japan
- RIKEN Center for Computational Science, Kobe, Japan
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Fukuhara S, Asai K, Kakeno A, Umebachi C, Yamanaka S, Watanabe T, Yamazaki T, Nakao K, Setoh K, Kawaguchi T, Morita S, Nakayama T, Matsuda F, Bessho K. Association of Education and Depressive Symptoms with Tooth Loss. J Dent Res 2020; 100:361-368. [PMID: 33155502 DOI: 10.1177/0022034520969129] [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] [Indexed: 11/16/2022] Open
Abstract
Previous evidence suggests the association of lower educational attainment and depressive symptoms with tooth loss. The hypothesis of this study was that these factors may exacerbate the effect on tooth loss beyond the sum of their individual effects. We aimed to clarify the independent and interactive effects of educational attainment and depressive symptoms on the number of missing teeth among community residents. Cross-sectional data of 9,647 individuals were collected from the general Japanese population. Dental examination was conducted by dentists. Educational attainment was categorized into 3 levels based on the number of educational years: ≤9, >9 to ≤12, and >12 y. The Center for Epidemiologic Studies Depression Scale (CES-D) was used to assess depressive symptoms; a total score of ≥16 and/or the use of medications for depression indicate the presence of depressive symptoms. In the multivariate analysis with adjustment for conventional risk factors, educational attainment was identified as a determinant of the number of missing teeth (>9 to ≤12 y of education: coefficient = 0.199, 95% confidence interval [CI], 0.135 to 0.263, P < 0.001; ≤9 y of education: coefficient = 0.318, 95% CI, 0.231 to 0.405, P < 0.001: reference, >12 y of education). An analysis that included interaction terms revealed that the relationship between "≤9 y of education" and the number of missing teeth differed depending on the depressive symptoms, indicating a positive interactive association (coefficient for interaction = 0.198; 95% CI, 0.033 to 0.364, P for interaction = 0.019: reference, >12 y of education). Our study suggests the presence of a significant association between educational attainment and tooth loss, as well as a partial interactive association between "≤9 y of education" and "depressive symptoms" in the general Japanese population.
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Affiliation(s)
- S Fukuhara
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Asai
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - A Kakeno
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - C Umebachi
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - S Yamanaka
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Watanabe
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Yamazaki
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Nakao
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Setoh
- Center for Genomic Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Kawaguchi
- Center for Genomic Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - S Morita
- Department of Biomedical Statistics and Bioinformatics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Nakayama
- Department of Health Informatics, Kyoto University School of Public Health, Kyoto, Japan
| | - F Matsuda
- Center for Genomic Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Bessho
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Ikeda T, Ogawa S, Kitazono T, Nakagawara J, Minematsu K, Miyamoto S, Murakawa Y, Iwashiro S, Hayashi Y, Okayama Y, Sunaya T, Sato S, Yamanaka S. Long-term outcomes of Japan-specific dosage of rivaroxaban in high-risk patients with non-valvular atrial fibrillation: analysis from the XAPASS. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0646] [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
XAPASS is a real-world, prospective, single-arm, observational study conducted as a post-marketing surveillance mandated by the health authority in Japan. Nowadays, direct oral anticoagulant therapy using factor Xa or thrombin inhibitor has been the standard of care for patients with non-valvular atrial fibrillation (NVAF) to prevent ischemic stroke. However, the clinical impact of reduced dosage (approved dose of 15 or 10 mg once daily in Japan is relatively reduced compared to global dosage) factor Xa inhibitor rivaroxaban in high-risk patients remains unclear.
Purpose
The present sub-analysis of XAPASS was carried out to assess long-term safety and effectiveness of reduced-dose rivaroxaban in high-risk NVAF patients for bleeding and thromboembolism.
Methods
All patients with NVAF who were newly started on rivaroxaban were eligible for surveillance. The principal safety outcome was a composite of major and non-major bleeding events, and the primary effectiveness outcome was a composite of ischaemic stroke, haemorrhagic stroke, non-central nervous system systemic embolism (non-CNS SE), and myocardial infarction (MI). In this present sub-analysis, high-risk patients were defined as those who had two of the following three risk factors: elderly (≥75 years old), low body weight (≤50 kg), and renal impairment (CrCl <50 mL/min).
Results
In total, 11,308 patients were enrolled between April 2012 and June 2014 from 1,419 hospitals, and overall data were analysed from 10,664 patients from whom data were collected. Among them, 3,694 patients matched the criteria for the high-risk patients defined in this sub-analysis, and 6,970 patients did not match the criteria (non-high-risk patients). The mean treatment duration was 791±673 days in the high-risk patients and 944±709 days in the non-high-risk patients. Mean patient age was 80.9±5.5 years and 69.0±9.0 years at baseline, respectively. Mean CHADS2 score was 2.8 and 1.8, and CHA2DS2-VASc score was 4.4 and 2.9, respectively. The rates of CHADS2 component comorbidities were lower in the non-high-risk patients except for diabetes mellitus. The incidence rates of any bleeding, major bleeding, and the primary effectiveness outcomes were 4.8, 1.6, and 2.1%/patient-year in the high-risk patients. The incidence rates of these clinical events in the non-high-risk patients were 3.3, 0.9, and 1.0%/patient-year, respectively.
Conclusions
Incidence rates of long-term bleeding and thromboembolism were higher in the high-risk patients than in the non-high-risk patients. However, the rates of these outcomes using the Japan-specific reduced dose were not so high. Furthermore, the balance between safety and effectiveness outcomes was within an acceptable range. The present study provides useful information for physicians to stratify high-risk patients using the reduced dose in daily clinical practice.
Funding Acknowledgement
Type of funding source: Private company. Main funding source(s): Bayer Yakuhin Ltd.
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Affiliation(s)
- T Ikeda
- Toho University, Department of Cardiovascular Medicine, Tokyo, Japan
| | - S Ogawa
- IUHW Mita Hospital, Tokyo, Japan
| | - T Kitazono
- Kyushu University Graduate School of Medical Sciences, Department of Medical and Clinical Science, Fukuoka, Japan
| | - J Nakagawara
- National Cerebral & Cardiovascular Center, Suita, Japan
| | - K Minematsu
- National Cerebral & Cardiovascular Center, Suita, Japan
| | - S Miyamoto
- Kyoto University Graduate School of Medicine, Department of Neurosurgery, Kyoto, Japan
| | - Y Murakawa
- Mizonokuchi Hospital, Teikyo University School of Medicine, The 4th Department of Internal Medicine, Kawasaki, Japan
| | - S Iwashiro
- Bayer Yakuhin Ltd., Medical Affairs, Osaka, Japan
| | - Y Hayashi
- Bayer Yakuhin Ltd., Medical Affairs, Osaka, Japan
| | - Y Okayama
- Bayer Yakuhin Ltd., Medical Affairs, Osaka, Japan
| | - T Sunaya
- Bayer Yakuhin Ltd., Research and Development, Osaka, Japan
| | - S Sato
- Bayer Yakuhin Ltd., Medical Affairs, Osaka, Japan
| | - S Yamanaka
- Bayer Yakuhin Ltd., Medical Affairs, Osaka, Japan
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TAKAMURA T, Fujimoto T, Matsumoto N, Saito Y, Tajiri S, Yamanaka S, Matsumoto K, Okano james H, Yokoo T. SUN-313 A NEW NEPHRON PROGENITOR CELL REPLACEMENT SYSTEM CAN REGENERATE NEPHRONS FROM HUMAN INDUCED PLURIPOTENT STEM CELLS. Kidney Int Rep 2020. [DOI: 10.1016/j.ekir.2020.02.850] [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] Open
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8
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Fujihashi T, Sataka Y, Nochioka K, Miura M, Kasahara S, Sato M, Aoyanagi H, Yamanaka S, Hayashi H, Shiroto T, Sugimura K, Takahashi J, Miyata S, Shimokawa H. P6337Prognostic impacts of serum uric acid levels in patients with chronic heart failure: insights from the CHART-2 Study. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0934] [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
Prognostic impact of serum uric acid (UA) levels in patients with heart failure (HF) remains to be fully elucidated, as previous studies were inconclusive with small study sample sizes. Furthermore, although the J-curve relationship between serum UA levels and cardiovascular events has been suggested in patients with hypertension and those with diabetes, it is still unclear whether this is also the case for patients with HF.
Purpose
We examined the prognostic impacts of serum UA levels in HF patients, using the database of our Chronic Heart Failure Registry and Analysis in the Tohoku district (CHART)-2 Study, the largest multicenter, prospective, observational cohort study for cardiovascular patients with HF or those at risk of HF in Japan (N=10,219).
Methods
First, we determined the cut-off value of serum UA levels at baseline by the Classification and Regression Tree (CART). Then, we divided 4,652 consecutive HF patients in the CHART-2 Study into 4 groups; G1 (<3.8 mg/dL, N=313), G2 (3.8–7.1 mg/dL, N=3,070), G3 (7.2–9.2 mg/dL, N=1,018), and G4 (≥9.3 mg/dL, N=251). Among the 4 groups, we compared clinical characteristics and incidence of all-cause death, HF hospitalization, and a composite of all-cause death and HF hospitalization.
Results
Mean age in G1, G2, G3, and G4 was 71±12, 69±12, 68±13, and 69±15 years, respectively (P<0.001). G1 was characterized by a significantly high prevalence of women as compared with G2, G3 and G4 (59, 32, 24 and 23%, respectively). Serum creatinine levels (0.8±0.4, 0.9±0.4, 1.2±0.6 and 1.4±0.8 mg/dL, respectively), prevalence of atrial fibrillation (34, 39, 45 and 50%, respectively), and diuretics use (36, 45, 67, 89%, respectively) increased from G1, G2, G3 to G4 (all P<0.001), while left ventricular ejection fraction decreased from G1, G2, G3 to G4 (59±15, 58±15, 54±15, and 52±17%, respectively, P<0.001). Median BNP levels were comparably low in G1 and G2 and then increased to G3 and G4 (94.4, 91.5, 130 and 192.5 pg/mL, respectively, P<0.001). As a HF etiology, prevalence of ischemic heart disease was highest in G2 and lowest in G4 (48, 52, 48, 38%, respectively, P<0.001), while that of dilated cardiomyopathy increased from G1, G2, G3 to G4 (11, 12, 16 and 20%, respectively, P<0.001). During the median follow-up period of 6.3 years, in G1, G2, G3 and G4, 111 (35%), 905 (29%), 370 (36%) and 139 (55%) patients died and 79 (25%), 729 (24%), 300 (29%) and 115 (46%) experienced HF hospitalization, respectively (both P<0.001). Cox proportional hazard models adjusted for clinical backgrounds showed that, as compared with G2, both G1 and G4 had increased risk for all-cause death, HF hospitalization and a composite of all-cause death, and HF hospitalization, indicating the J-curve relationship between serum UA levels and prognosis (Figure).
Prognostic impacts of serum UA levels
Conclusions
Both decreased and increased UA levels were associated with increased incidence of death and HF hospitalization in HF patients.
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Affiliation(s)
- T Fujihashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - Y Sataka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K Nochioka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - M Miura
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Kasahara
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - M Sato
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - H Aoyanagi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Yamanaka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - H Hayashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - T Shiroto
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K Sugimura
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - J Takahashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Miyata
- Tohoku University Graduate School of Medicine, Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | - H Shimokawa
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
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Miyagawa K, Kawakami T, Isobe H, Shoji M, Yamanaka S, Nakatani K, Okumura M, Nakajima T, Yamaguchi K. Domain-based local pair natural orbital CCSD(T) calculations of six different S1 structures of oxygen evolving complex of photosystem II. Proposal of multi-intermediate models for the S1 state. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136660] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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10
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Miyagawa K, Kawakami T, Suzuki Y, Isobe H, Shoji M, Yamanaka S, Okumura M, Nakajima T, Yamaguchi K. Domain-based local pair natural orbital CCSD(T) calculations of strongly correlated electron systems: Examination of dynamic equilibrium models based on multiple intermediates in S1 state of photosystem II. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1666171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- K. Miyagawa
- Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
| | - T. Kawakami
- Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
- RIKEN Center for Computational Science, Kobe, Hyogo 650-0047, Japan
| | - Y. Suzuki
- Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - H. Isobe
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - M. Shoji
- Center of Computational Sciences, Tsukuba University, Tsukuba, Ibaraki 305-8577, Japan
| | - S. Yamanaka
- Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - M. Okumura
- Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - T. Nakajima
- RIKEN Center for Computational Science, Kobe, Hyogo 650-0047, Japan
| | - K. Yamaguchi
- Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
- RIKEN Center for Computational Science, Kobe, Hyogo 650-0047, Japan
- Insitute for Nanoscience Design, Osaka University, Toyonaka 560-0043, Japan
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11
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Kawakami T, Miyagawa K, Isobe H, Shoji M, Yamanaka S, Katouda M, Nakajima T, Nakatani K, Okumura M, Yamaguchi K. Relative stability between the manganese hydroxide- and oxo-models for water oxidation by CCSD, DMRG CASCI, CASSCF, CASPT2 and CASDFT methods; Importance of static and dynamical electron correlation effects for OEC of PSII. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.05.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Yamanaka S, Tajiri S, Fujimoto T, Matsumoto K, Fukunaga S, Kim BS, Okano HJ, Yokoo T. Generation of interspecies limited chimeric nephrons using a conditional nephron progenitor cell replacement system. Nat Commun 2017; 8:1719. [PMID: 29170512 PMCID: PMC5701015 DOI: 10.1038/s41467-017-01922-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [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: 03/14/2017] [Accepted: 10/25/2017] [Indexed: 01/08/2023] Open
Abstract
Animal fetuses and embryos may have applications in the generation of human organs. Progenitor cells may be an appropriate cell source for regenerative organs because of their safety and availability. However, regenerative organs derived from exogenous lineage progenitors in developing animal fetuses have not yet been obtained. Here, we established a combination system through which donor cells could be precisely injected into the nephrogenic zone and native nephron progenitor cells (NPCs) could be eliminated in a time- and tissue-specific manner. We successfully achieved removal of Six2+ NPCs within the nephrogenic niche and complete replacement of transplanted NPCs with donor cells. These NPCs developed into mature glomeruli and renal tubules, and blood flow was observed following transplantation in vivo. Furthermore, this artificial nephron could be obtained using NPCs from different species. Thus, this technique enables in vivo differentiation from progenitor cells into nephrons, providing insights into nephrogenesis and organ regeneration. The transplantation of tissue-specific progenitor cells may be an approach in organ regeneration. Here the authors show that the nephron progenitor population of a developing mouse kidney, when ablated, can be replaced by exogenously supplied rat nephron progenitors, generating interspecies nephrons.
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Affiliation(s)
- S Yamanaka
- Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan
| | - S Tajiri
- Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan.,Division of Regenerative Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan
| | - T Fujimoto
- Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan.,Division of Regenerative Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan
| | - K Matsumoto
- Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan
| | - S Fukunaga
- Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan.,Department of Internal Medicine IV, Shimane University, Izumo, Shimane, 6938501, Japan
| | - B S Kim
- Division of Regenerative Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan.,Department of Urology, Kyungpook National University School of Medicine, Daegu, 41944, Korea
| | - H J Okano
- Division of Regenerative Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan
| | - T Yokoo
- Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, 1058461, Japan.
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13
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Miyagawa K, Komi K, Ohnari J, Maruyama S, Yamanaka S, Saito T, Kawakami T, Yamaguchi K, Okumura M. Density functional study of the magneto-structural correlations of manganese complexes, [Mn2O2H (salpn)2]+(2−) (n= 0–2) from the viewpoint of the protonation modes of the bridging oxygen anions. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.044] [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: 10/19/2022]
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14
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Yamanaka S. Recent progress in iPS cell research and application. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.153] [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: 11/29/2022]
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15
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Yamanaka S, Nakao K, Koyama N, Isobe Y, Ueda Y, Kanai Y, Kondo E, Fujii T, Miura M, Yasoda A, Nakao K, Bessho K. Circulatory CNP Rescues Craniofacial Hypoplasia in Achondroplasia. J Dent Res 2017. [PMID: 28644737 DOI: 10.1177/0022034517716437] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Achondroplasia is the most common genetic form of human dwarfism, characterized by midfacial hypoplasia resulting in occlusal abnormality and foramen magnum stenosis, leading to serious neurologic complications and hydrocephalus. Currently, surgery is the only way to manage jaw deformity, neurologic complications, and hydrocephalus in patients with achondroplasia. We previously showed that C-type natriuretic peptide (CNP) is a potent stimulator of endochondral bone growth of long bones and vertebrae and is also a potent stimulator in the craniofacial region, which is crucial for midfacial skeletogenesis. In this study, we analyzed craniofacial morphology in a mouse model of achondroplasia, in which fibroblast growth factor receptor 3 (FGFR3) is specifically activated in cartilage ( Fgfr3ach mice), and investigated the mechanisms of jaw deformities caused by this mutation. Furthermore, we analyzed the effect of CNP on the maxillofacial area in these animals. Fgfr3ach mice exhibited midfacial hypoplasia, especially in the sagittal direction, caused by impaired endochondral ossification in craniofacial cartilage and by premature closure of the spheno-occipital synchondrosis, an important growth center in craniomaxillofacial skeletogenesis. We crossed Fgfr3ach mice with transgenic mice in which CNP is expressed in the liver under the control of the human serum amyloid-P component promoter, resulting in elevated levels of circulatory CNP ( Fgfr3ach/SAP-Nppc-Tg mice). In the progeny, midfacial hypoplasia in the sagittal direction observed in Fgfr3ach mice was improved significantly by restoring the thickness of synchondrosis and promoting proliferation of chondrocytes in the craniofacial cartilage. In addition, the foramen magnum stenosis observed in Fgfr3ach mice was significantly ameliorated in Fgfr3ach/SAP-Nppc-Tg mice due to enhanced endochondral bone growth of the anterior intraoccipital synchondrosis. These results clearly demonstrate the therapeutic potential of CNP for treatment of midfacial hypoplasia and foramen magnum stenosis in achondroplasia.
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Affiliation(s)
- S Yamanaka
- 1 Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kazumasa Nakao
- 1 Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - N Koyama
- 1 Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Isobe
- 1 Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Ueda
- 2 Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Kanai
- 2 Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - E Kondo
- 2 Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Fujii
- 2 Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - M Miura
- 2 Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - A Yasoda
- 2 Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kazuwa Nakao
- 3 TK Project, Medical Innovation Center, Kyoto University, Kyoto, Japan
| | - K Bessho
- 1 Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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16
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Yamaguchi K, Shoji M, Isobe H, Yamanaka S, Umena Y, Kawakami K, Kamiya N. On the guiding principles for understanding of geometrical structures of the CaMn4O5 cluster in oxygen-evolving complex of photosystem II. Proposal of estimation formula of structural deformations via the Jahn–Teller effects. Mol Phys 2017. [DOI: 10.1080/00268976.2016.1278476] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- K. Yamaguchi
- Institute for Nanoscience Design, Osaka University, Toyonaka, Japan
- Handairigaku Techno-Research , Toyonaka, Japan
| | - M. Shoji
- Center of Computational Sciences, Tsukuba University , Tsukuba, Japan
| | - H. Isobe
- Graduate School of Natural Science and Technology, Okayama University , Okayama, Japan
| | - S. Yamanaka
- Graduate School of Science, Osaka University , Osaka, Japan
| | - Y. Umena
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA), Osaka City University , Osaka, Japan
| | - K. Kawakami
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA), Osaka City University , Osaka, Japan
| | - N. Kamiya
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA), Osaka City University , Osaka, Japan
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Kurihara M, Mizobuti T, Yamanaka S. O-139THORACOGRAPHIC FIBRIN GLUE SEALING: A NOVEL INTERVENTIONAL TREATMENT FOR PNEUMOTHORAX WITH INTRACTABLE PERSISTENT AIR LEAKAGE. Interact Cardiovasc Thorac Surg 2016. [DOI: 10.1093/icvts/ivw260.137] [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: 11/14/2022] Open
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18
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Yamaguchi K, Isobe H, Shoji M, Yamanaka S, Okumura M. Theory of chemical bonds in metalloenzymes XX: magneto-structural correlations in the CaMn4O5cluster in oxygen-evolving complex of photosystem II. Mol Phys 2015. [DOI: 10.1080/00268976.2015.1114162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Yukimura T, Miura K, Yamashita Y, Shimmen T, Okumura M, Yamanaka S, Saito M, Yamamoto K. Effects of the calcium channel antagonist nicardipine on renal action of endothelin in dogs. Contrib Nephrol 2015; 90:105-10. [PMID: 1959334 DOI: 10.1159/000420131] [Citation(s) in RCA: 6] [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: 12/29/2022]
Abstract
Endothelin is a potent vasoconstrictor peptide isolated from cultured vascular endothelial cells. Interaction between endothelin and calcium channel antagonist on the renal hemodynamics and urine formation was studied in anesthetized dogs. Intrarenal arterial administration of the peptide progressively reduced renal blood flow from 139 +/- 22 to 85 +/- 12 ml/min at 20 min after the start of continuous infusion, with no change in systemic blood pressure. Glomerular filtration rate, urine flow and urinary sodium and calcium excretion decreased significantly by 30-50% from the preinfusion control values. An endothelin-induced reduction in renal blood flow was markedly attenuated by pretreatment with the calcium antagonist nicardipine (100 ng/kg/min intrarenally). Changes in glomerular filtration rate and antinatriuretic and anticalciuretic actions by the peptide was not affected by nicardipine treatment. It is suggested that the renal vasoconstrictor action, but not the tubular action, of endothelin is functionally coupled with the activation of dihydropyridine-sensitive calcium channels.
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Affiliation(s)
- T Yukimura
- Department of Pharmacology, Osaka City University Medical School, Japan
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20
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Isobe H, Shoji M, Yamanaka S, Mino H, Umena Y, Kawakami K, Kamiya N, Shen JR, Yamaguchi K. Generalized approximate spin projection calculations of effective exchange integrals of the CaMn4O5 cluster in the S1 and S3 states of the oxygen evolving complex of photosystem II. Phys Chem Chem Phys 2015; 16:11911-23. [PMID: 24632787 DOI: 10.1039/c4cp00282b] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Full geometry optimizations followed by the vibrational analysis were performed for eight spin configurations of the CaMn4O4X(H2O)3Y (X = O, OH; Y = H2O, OH) cluster in the S1 and S3 states of the oxygen evolution complex (OEC) of photosystem II (PSII). The energy gaps among these configurations obtained by vertical, adiabatic and adiabatic plus zero-point-energy (ZPE) correction procedures have been used for computation of the effective exchange integrals (J) in the spin Hamiltonian model. The J values are calculated by the (1) analytical method and the (2) generalized approximate spin projection (AP) method that eliminates the spin contamination errors of UB3LYP solutions. Using J values derived from these methods, exact diagonalization of the spin Hamiltonian matrix was carried out, yielding excitation energies and spin densities of the ground and lower-excited states of the cluster. The obtained results for the right (R)- and left (L)-opened structures in the S1 and S3 states are found to be consistent with available optical and magnetic experimental results. Implications of the computational results are discussed in relation to (a) the necessity of the exact diagonalization for computations of reliable energy levels, (b) magneto-structural correlations in the CaMn4O5 cluster of the OEC of PSII, (c) structural symmetry breaking in the S1 and S3 states, and (d) the right- and left-handed scenarios for the O-O bond formation for water oxidation.
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Affiliation(s)
- H Isobe
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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21
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Shoji M, Isobe H, Yamanaka S, Umena Y, Kawakami K, Kamiya N, Shen JR, Nakajima T, Yamaguchi K. Large-Scale QM/MM Calculations of Hydrogen Bonding Networks for Proton Transfer and Water Inlet Channels for Water Oxidation—Theoretical System Models of the Oxygen-Evolving Complex of Photosystem II. Advances in Quantum Chemistry 2015. [DOI: 10.1016/bs.aiq.2014.10.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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22
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Nishimura Y, Hagiwara A, Suzuki T, Yamanaka S. Xenorhabdus japonicus sp. nov. associated with the nematode Steinernema kushidai. World J Microbiol Biotechnol 2014; 10:207-10. [PMID: 24420949 DOI: 10.1007/bf00360889] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/1993] [Accepted: 09/02/1993] [Indexed: 11/28/2022]
Abstract
A new species, Xenorhabdus japonicus, is proposed as the bacterial symbiont of Steinernema kushidai isolated from field soil in Shizuoka Prefecture, Japan. Xenorhabdus japonicus could be distinguished phenotypically and genetically from other Xenorhabdus spp. The type strain of the species, SK-1, a Gram-negative, facultative anaerobe and peritrichously flagellated rod, has colonies with primary and secondary forms. The strain can be differentiated from the type strain of Xenorhabdus nematophilus by several characters, including the formation of arginine dehydrolase, phenylalanine deaminase and lysine decarboxylase, the assimilation of inosine and L-proline and acid production from inositol. The major cellular fatty acids are 16:0, cyclo 17:0 and 18:1. The ubiquinone system is Q-8. The G+C content of DNA is 45.9 mol%. The DNA of strain SK-1 has 20 to 58% homology with that of the type strains of other Xenorhabdus spp.
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Affiliation(s)
- Y Nishimura
- the Science University of Tokyo, Tokyo, Japan
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23
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Yamaguchi K, Kitagawa Y, Isobe H, Shoji M, Yamanaka S, Okumura M. Reprint of “Theory of chemical bonds in metalloenzymes XVIII. Importance of mixed-valence configurations for Mn5O5, CaMn4O5 and Ca2Mn3O5 clusters revealed by UB3LYP computations. A bio-inspired strategy for artificial photosynthesis”. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.08.003] [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: 10/26/2022]
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24
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Yamaguchi K, Shoji M, Isobe H, Kitagawa Y, Yamada S, Kawakami T, Yamanaka S, Okumura M. Theory of chemical bonds in metalloenzymes XVI. Oxygen activation by high-valent transition metal ions in native and artificial systems. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.05.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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25
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Yamaguchi K, Yamanaka S, Shoji M, Isobe H, Kitagawa Y, Kawakami T, Yamada S, Okumura M. Theory of chemical bonds in metalloenzymes XIX: labile manganese oxygen bonds of the CaMn4O5cluster in oxygen evolving complex of photosystem II. Mol Phys 2013. [DOI: 10.1080/00268976.2013.842009] [Citation(s) in RCA: 13] [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] [Indexed: 10/26/2022]
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26
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Kitagawa Y, Kawakami T, Yamanaka S, Okumura M. DFT and DFT-D studies on molecular structure of double-decker phthalocyaninato-terbium(III) complex. Mol Phys 2013. [DOI: 10.1080/00268976.2013.825341] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Yamaguchi K, Kitagawa Y, Isobe H, Shoji M, Yamanaka S, Okumura M. Theory of chemical bonds in metalloenzymes XVIII. Importance of mixed-valence configurations for Mn5O5, CaMn4O5 and Ca2Mn3O5 clusters revealed by UB3LYP computations. A bio-inspired strategy for artificial photosynthesis. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.04.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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28
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Egawa N, Kitaoka S, Tsukita K, Naitoh M, Takahashi K, Yamamoto T, Adachi F, Kondo T, Okita K, Asaka I, Aoi T, Watanabe A, Yamada Y, Morizane A, Takahashi J, Ayaki T, Ito H, Yoshikawa K, Yamawaki S, Suzuki S, Watanabe D, Hioki H, Kaneko T, Makioka K, Okamoto K, Takuma H, Tamaoka A, Hasegawa K, Nonaka T, Hasegawa M, Kawata A, Yoshida M, Nakahata T, Takahashi R, Marchetto MCN, Gage FH, Yamanaka S, Inoue H. Response to Comment on "Drug Screening for ALS Using Patient-Specific Induced Pluripotent Stem Cells". Sci Transl Med 2013; 5:188lr2. [DOI: 10.1126/scitranslmed.3005697] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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29
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Tateishi K, Tateishi U, Sato M, Yamanaka S, Kanno H, Murata H, Inoue T, Kawahara N. Application of 62Cu-diacetyl-bis (N4-methylthiosemicarbazone) PET imaging to predict highly malignant tumor grades and hypoxia-inducible factor-1α expression in patients with glioma. AJNR Am J Neuroradiol 2013; 34:92-9. [PMID: 22700754 DOI: 10.3174/ajnr.a3159] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [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: 12/12/2022]
Abstract
BACKGROUND AND PURPOSE Hypoxic tissue evaluation in glioma is important for predicting treatment response and establishing antihypoxia therapy. In this preliminary study, (62)Cu-ATSM PET was used to determine its validity as a biomarker for distinguishing tumor grade and tissue hypoxia. MATERIALS AND METHODS (62)Cu-ATSM PET was performed in 22 patients with glioma, and the (62)Cu-ATSM SUV(max) and T/B ratio were semiquantitatively evaluated. (62)Cu-ATSM uptake distribution was qualitatively evaluated and compared with MR imaging findings. HIF-1α expression, a hypoxia marker, was compared with (62)Cu-ATSM uptake values. RESULTS The (62)Cu-ATSM SUV(max) and T/B ratio were significantly higher in grade IV than in grade III gliomas (P = .014 and .018, respectively), whereas no significant differences were found between grade III and grade II gliomas. At a T/B ratio cutoff threshold of 1.8, (62)Cu-ATSM uptake was predictive of HIF-1α expression, with 92.3% sensitivity and 88.9% specificity. The mean T/B ratio was also significantly higher in HIF-1α-positive glioma tissue than in HIF-1α-negative tissue (P = .001). Using this optimal threshold of T/B ratio, (62)Cu-ATSM PET showed regional uptake in 61.9% (13/21) of tumors within the contrast-enhanced region on MR imaging, which was significantly correlated with presence of a necrotic component (P = .002). CONCLUSIONS Our results demonstrated that (62)Cu-ATSM uptake is relatively high in grade IV gliomas and correlates with the MR imaging findings of necrosis. Moreover, the (62)Cu-ATSM T/B ratio showed significant correlation with HIF-1α expression. Thus, (62)Cu-ATSM appears to be a suitable biomarker for predicting highly malignant grades and tissue hypoxia in patients with glioma.
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Affiliation(s)
- K Tateishi
- Department of Neurosurgery, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
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30
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Shoji M, Isobe H, Yamanaka S, Umena Y, Kawakami K, Kamiya N, Shen JR, Yamaguchi K. Theoretical insight in to hydrogen-bonding networks and proton wire for the CaMn4O5 cluster of photosystem II. Elongation of Mn–Mn distances with hydrogen bonds. Catal Sci Technol 2013. [DOI: 10.1039/c3cy00051f] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Yamada E, Endo H, Nakajima A, Yamanaka S. Disseminated Mycobacterium avium disease with nodular infiltration in the small intestine, detected by capsule endoscopy. Endoscopy 2012; 43 Suppl 2 UCTN:E332-3. [PMID: 22020712 DOI: 10.1055/s-0030-1256782] [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: 12/10/2022]
Affiliation(s)
- E Yamada
- Division of Gastroenterology, Yokohama City University School of Medicine, Yokohama, Japan
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Takayama S, Izuhara C, Yamada N, Yamanaka S, Hashimoto E, Kaneko S, Takeuchi K. A new model of gastric bleeding induced in rats by aspirin plus clopidogrel under stimulation of acid secretion. Prophylactic effects of antiulcer drugs. J Physiol Pharmacol 2012; 63:41-52. [PMID: 22460460] [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] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Accepted: 02/10/2012] [Indexed: 05/31/2023]
Abstract
We set up a new model of gastric bleeding induced by the luminal perfusion of aspirin (ASA) in rats pretreated with clopidogrel under conditions where acid secretion is stimulated, and examined the effect of antiulcer drugs on the bleeding. Under urethane anesthesia, acid secretion was stimulated by i.v. infusion of histamine (8 mg/kg/h), and two catheters were inserted into the stomach, one from the esophagus and another from the duodenum. The stomach was perfused with 25 mM ASA at a rate of 0.1 ml/min using an infusion pump, and gastric bleeding was measured as hemoglobin concentration in the perfusate collected every 15 min. Clopidogrel (30 mg/kg) was given orally 24 h before the perfusion. Various antiulcer drugs were given intraduodenally 30 min before the ASA treatment. Perfusion of the stomach with ASA provoked little gastric bleeding or damage even when acid secretion was stimulated. Pretreatment with clopidogrel significantly increased the bleeding and damage caused by ASA. The bleeding and lesions produced by ASA plus clopidogrel were significantly prevented by pretreatment with famotidine and omeprazole. Mucosal protective drugs such as rebamipide, irsogladine and teprenone also prevented gastric bleeding response to ASA/clopidogrel under conditions of acid secretion, although the effect was less pronounced than that of the antisecretory drugs. We conclude that clopidogrel increases gastric bleeding induced by ASA when acid secretion is stimulated. Both antisecretory and mucosal protective drugs are effective in reducing gastric bleeding under such conditions. This model is useful for the screening of drugs that protect against gastric bleeding.
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Affiliation(s)
- S Takayama
- Department of Pharmacology and Experimental Therapeutics, Division of Pathological Sciences, Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto, Japan.
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Yamanaka S, Kanda K, Saito T, Umena Y, Kawakami K, Shen JR, Kamiya N, Okumura M, Nakamura H, Yamaguchi K. Electronic and Spin Structures of the CaMn4O5(H2O)4 Cluster in OEC of PSII Refined to 1.9Å X-ray Resolution. Advances in Quantum Chemistry Volume 64 2012. [DOI: 10.1016/b978-0-12-396498-4.00016-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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34
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Isobe H, Shoji M, Yamanaka S, Umena Y, Kawakami K, Kamiya N, Shen JR, Yamaguchi K. Theoretical illumination of water-inserted structures of the CaMn4O5 cluster in the S2 and S3 states of oxygen-evolving complex of photosystem II: full geometry optimizations by B3LYP hybrid density functional. Dalton Trans 2012; 41:13727-40. [DOI: 10.1039/c2dt31420g] [Citation(s) in RCA: 162] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Kitagawa Y, Nakanishi Y, Kataoka Y, Saito T, Yasuda N, Kawakami T, Yamanaka S, Okumura M, Yamaguchi K. Theoretical study of intra- and inter-chain magnetic interactions in [Ni(chxn)2Br]Br2. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Yamanaka S, Isobe H, Kanda K, Saito T, Umena Y, Kawakami K, Shen JR, Kamiya N, Okumura M, Nakamura H, Yamaguchi K. Possible mechanisms for the O–O bond formation in oxygen evolution reaction at the CaMn4O5(H2O)4 cluster of PSII refined to 1.9Å X-ray resolution. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.06.021] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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37
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Affiliation(s)
- Y Kumon
- Department of Laboratory Medicine, Kochi Medical School, Kochi University, Kochi, Japan.
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Oshiro H, Nagashima Y, Kanazawa M, Sagawa H, Yamanaka S, Inayama Y. Imprint cytology of primary ethmoidal lipid-rich carcinoma combined with adipophilin immunocytochemistry. Cytopathology 2011; 21:420-3. [PMID: 20132263 DOI: 10.1111/j.1365-2303.2010.00736.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
AbstractInterlayers of montmorillonite were pillared with TiO2, SiO2-TiO2and SiO2-Fe2O3sols. The pillared structures were thermally stable at least up to 500°C and retained unusually large basal spacings in the range of 24–45Å and surface areas as high as 300–500 m2/g. The TiO2pillared clay showed Type IV adsorption isotherm for nitrogen. Although SiO2-TiO2and SiO2-Fe2O3pillared clays had basal spacings much larger than that of TiO2pillared clay, these mixed oxide pillared clays had small pores and exhibited Type I isotherm. The acidic strength distributions were determined by a titration method using n-butylamine and Hammett indicators. All of the pillared clays had large acidities, but the acidic strength decreased in the following order: TiO2- SiO2» SiO2-Fe2O3pillared clays. Temperature-programmed desorption (TPD) spectra of ammonia were measured and interpreted in relation to the acidity distribution. Infrared spectra of pyridine adsorbed on TiO2pillared clay indicated that the acidity predominantly arises from Lewis acid sites.
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Tamaoki N, Takahashi K, Tanaka T, Ichisaka T, Aoki H, Takeda-Kawaguchi T, Iida K, Kunisada T, Shibata T, Yamanaka S, Tezuka K. Dental pulp cells for induced pluripotent stem cell banking. J Dent Res 2010; 89:773-8. [PMID: 20554890 DOI: 10.1177/0022034510366846] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Defined sets of transcriptional factors can reprogram human somatic cells to induced pluripotent stem (iPS) cells. However, many types of human cells are not easily accessible to minimally invasive procedures. Here we evaluated dental pulp cells (DPCs) as an optimal source of iPS cells, since they are easily obtained from extracted teeth and can be expanded under simple culture conditions. From all 6 DPC lines tested with the conventional 3 or 4 reprogramming factors, iPS cells were effectively established from 5 DPC lines. Furthermore, determination of the HLA types of 107 DPC lines revealed 2 lines homozygous for all 3 HLA loci and showed that if an iPS bank is established from these initial pools, the bank will cover approximately 20% of the Japanese population with a perfect match. Analysis of these data demonstrates the promising potential of DPC collections as a source of iPS cell banks for use in regenerative medicine.
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Affiliation(s)
- N Tamaoki
- Department of Oral and Maxillofacial Science, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu 501-1194, Japan
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41
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Yamanaka S, Uekusa T, Tajiri M. [Mucosa-associated lymphoid tissue lymphoma in the thymus with multiple amyloid nodules in the both lungs]. Kyobu Geka 2010; 63:392-395. [PMID: 20446609] [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] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Here, we present a case of mucosa-associated lymphoid tissue (MALT) lymphoma in the thymus with multiple amyloid nodules in both lung. A 66-year-old woman was incidentally found to have an abnormal shadow on mass-screening chest roentgenogram. A chest computed tomography (CT) demonstrated a mass of 50 mm in diameter with a smooth margin adjacent to the heart in the anterior mediastinum and multiple small nodules in both lung. As a differential diagnosis, thymic carcinoma with multiple lung metastases was firstly considered from these clinical informations. To make a definite diagnosis, the operation via a thoracoscopy was done. As a result, it turned out that pulmonary nodules were amyloidosis and the thymic tumor was MALT lymphoma. Postoperative course was uneventful and she was treated with chemoradiotherapy. In addition, she was diagnosed with Sjögren's syndrome 1 and half years later. Four years later the patient has been well without recurrence.
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Affiliation(s)
- S Yamanaka
- Department of Thoracic Surgery, Kanto Rosai Hospital, Kawasaki, Japan
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42
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Kawakami T, Takeda R, Nishihara S, Saito T, Shoji M, Yamada S, Yamanaka S, Kitagawa Y, Okumura M, Yamaguchi K. Symmetry and Broken-Symmetry in Molecular Orbital Descriptions of Unstable Molecules. 3. The Nature of Chemical Bonds of Spin Frustrated Systems. J Phys Chem A 2009; 113:15281-97. [DOI: 10.1021/jp905991r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T. Kawakami
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - R. Takeda
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - S. Nishihara
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - T. Saito
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - M. Shoji
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - S. Yamada
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - S. Yamanaka
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Y. Kitagawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - M. Okumura
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - K. Yamaguchi
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, Nanomaterial Design Center, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan, and Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
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43
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Yamanaka S, Yamamoto T, Watanabe K, Inui K, Masuda M. [Metastatic ectopic cervical thymoma with prolonged survival; report of a case]. Kyobu Geka 2009; 62:594-597. [PMID: 19588834] [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] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A 60-year-old woman presented with a palpable and painful nodule of her neck. Physical examination revealed that the anterior neck mass was enlarged without other positive findings. The tumor was not diagnosed with a fine needle aspiration biopsy, so that the excision of the tumor was underwent. The diagnosis at permanent section analysis revealed a non-invasive thymoma. The patient did not receive adjunctive postoperative therapy. For the duration of 6.5-year follow-up, metastasis of the left lobe of thyroid and right upper lobe of lung in twice have been sequentially detected and resected, and now she has been healthy with no known recurrence of the tumor. The recurrence of a non-invasive cervical ectopic thymoma has been reported as extremely rare, and this case indicates that the surgical control for recurrence lesion of cervical ectopic thymoma is effective when the tumor is resectable.
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Affiliation(s)
- S Yamanaka
- Department of Thoracic Surgery, Yokohama City University Medical Center, Yokohama, Japan
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44
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Nishihara S, Yamanaka S, Nakata K, Kitagawa Y, Yonezawa Y, Okumura M, Nakamura H, Takada T, Yamaguchi K. A resonating broken-symmetry CI study of cationic states of phenalenyl dimeric compounds. Polyhedron 2009. [DOI: 10.1016/j.poly.2008.10.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Nishihara S, Yamanaka S, Kusakabe K, Nakata K, Yonezawa Y, Nakamura H, Takada T, Yamaguchi K. A resonating broken symmetry configuration interaction approach for double-exchange magnetic systems. J Phys Condens Matter 2009; 21:064227. [PMID: 21715929 DOI: 10.1088/0953-8984/21/6/064227] [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: 05/31/2023]
Abstract
The correct description for ion-radical systems has recently attracted much attention from density functional theory (DFT) researchers. Although several hybridization schemes using exact (Hartree-Fock) exchange and DFT exchange-correlation functionals have been proposed, it has been reported that such treatments do not work for the description of ion-radical systems. In this study we show that combining the exact exchange term in the Kohn-Sham DFT (or the Hartree-Fock equation) with the following resonating configuration interaction method is effective for the description of double-exchange type molecular magnetic interactions. The results are analyzed in relation to the 'many-electron self-interaction' concept that was recently proposed by DFT researchers.
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Affiliation(s)
- S Nishihara
- Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
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Aoi T, Yae K, Nakagawa M, Ichisaka T, Okita K, Takahashi K, Chiba T, Yamanaka S. Generation of Pluripotent Stem Cells from Adult Mouse Liver and Stomach Cells. Science 2008; 321:699-702. [DOI: 10.1126/science.1154884] [Citation(s) in RCA: 814] [Impact Index Per Article: 50.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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47
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Yamanaka S, Arai H, Rino Y, Masuda M. [Pulmonary metastasis of metachronous triple cancer occurring in a young patient]. Kyobu Geka 2008; 61:541-544. [PMID: 18616097] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A 24-year-old patient who developed pulmonary metastasis of metachronous triple cancer was presented. She had undergone surgery and combined chemotherapy for osteosarcoma of the right humerus in 1993. Then, she was followed-up without any sign of recurrence. She felt accidentally a lump of the right breast so she had visited a hospital for a work-up in 2004. The detailed examination proved that the right breast mass was primary breast cancer so the right mastectomy was carried out. Moreover, the left mastectomy was also carried out for the primary breast cancer in 2005. Additionally, a solitary nodule shadow was detected by computed tomography in 2007 so she had thoracoscopic partial resection of right middle lobe. Histopathologically, the tumor was diagnosed metastasis from the left breast cancer. It is unlikely that familial cancer disease was the underlying cause because she had no family history of cancer. A more likely explanation is that there is the influence of combined chemotherapy during puberty.
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Affiliation(s)
- S Yamanaka
- Department of General Surgery, Yokohama City University of Medicine, Yokohama, Japan
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Inoue K, Ikeda Y, Yamanaka S, Kumon Y, Ohkubo S, Morita T, Suehiro T, HAshimoto K. SERUM FETUIN-A LEVELS IN PATIENTS WITH RHEUMATOID ARTHRITIS. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70930-9] [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: 11/25/2022]
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49
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Ikeda Y, Yamanaka S, Kumon Y, Ohguro T, Ishibashi A, Takata H, Inoue M, Arii K, Suehiro T, Hashimoto K. INCREASED SERUM FETUIN-A IS A MARKER OF INSULIN RESISTANCE IN NON-DIABETIC JAPANESE SUBJECTS. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70489-6] [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]
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50
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Abstract
Pluripotent stem cells, such as embryonic stem cells (ESCs), proliferate rapidly while maintaining pluripotency, namely, the ability to differentiate into various types of cells. Embryonic stem cells are promising donor sources for cell transplantation therapies. However, human ESCs are also associated with ethical issues regarding the use of human embryos and rejection reactions after allogenic transplantation. It may be possible to overcome these issues by generating pluripotent stem cells directly from a patient's somatic cells. That somatic cell nuclei acquire an embryonic stem-like status by fusion with ESCs suggests the existence of 'pluripotency-inducing' factors. Previous studies have recently shown that retrovirus-mediated transfection with four transcription factors (Oct-3/4, Sox2, KLF4 and c-Myc), which are highly expressed in ESCs, into mouse fibroblasts has resulted in generation of induced pluripotent stem (iPS) cells. iPS cells are similar to ESCs in morphology, proliferation, and pluripotency, judged by teratoma formation and chimaera contribution. If iPS cells can be derived from human somatic cells, then such cells may thus lead to important drug discoveries and advances in regenerative medicine.
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Affiliation(s)
- S Yamanaka
- Department of Stem Cell Biology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan.
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