1
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Yashi M, Suzuki I, Ishida K, Imasato N, Shimoda H, Nakamura G, Hidetoshi K, Takei K, Nishihara D, Kijima T, Kamai T. Nodal tumor burden provides independent predictive value for biochemical recurrence in patients with node-positive prostate cancer after definitive surgery. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)00708-x] [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: 02/12/2023]
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2
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Yashi M, Yokoyama M, Nakamura G, Uematsu T, Takei K, Suzuki I, Sakamoto K, Nishihara D, Kijima T, Kamai T. Extended pelvic lymph node dissection during robotic prostate surgery firmly reduces biochemical recurrence: A propensity score-matched analysis for intermediate- to high-risk prostate cancer. Eur Urol 2022. [DOI: 10.1016/s0302-2838(22)00754-0] [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]
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3
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Numata R, Takigiku K, Takei K, Akazawa Y, Yonehara K, Obinata H, Konuma T, Kojima A. The impact of intraoperative pericardial three-dimensional echocardiography for the atrioventricular valve repair in the patient with congenital heart disease. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1613] [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
Atrioventricular valve (AVV) regurgitation enormously affected the survival outcome of the patients with congenital heart disease (CHD). However, the image quality by use of transthoracic echocardiography has not reached a level that is sufficient, and also, three-dimensional echocardiography, which is useful to clarify complex AVV anatomy, cannot be applied for the patients less than 15kg, to guide for the AVV repair in pediatric patients. We try to show surgeons more precise three-dimensional images about an AVV by using intraoperative pericardial three-dimensional echocardiography (IP3DE) and improve the surgical outcome.
Purpose
To determine the efficacy of IP3DE by assessing the surgical outcome of an AVV repair and re-intervention rate.
Method
Eighty-five patient with CHD who underwent atrioventricular repair with significant regurgitation (Grade 2–4+) before operation were divided into two groups imaged IP3DE or not, in our hospital from 1993 to 2020. We assessed the surgical outcome and re-intervention rate between two arms and re-evaluate AVV images before surgery compared to the IP3DE.
Result
IP3DE was performed in forty-six patients (IP3DE group) and thirty-nine patients were not (control group). Median age at AVV repair was 3.0/2.8 years, respectively. The AVV was tricuspid (n=25), mitral (n=41), or common (n=19). The IP3DE group had a significantly higher improvement in regurgitation of AVV (IP3DE: Grade 3.2±0.3 → 1.7±0.3 vs Control: Grade 2.8±0.3 → 1.8±0.3, p<0.05). Fifty-nine percent of the IP3DE group was successful outcome (Grade<1+ after repair). There was no significant difference in the rate of re-intervention after surgery between two groups. In multivariate analysis, using IP3DE contributed to successful outcome for AVV repair (OR: 4.66, 95% CI: 1.46–14.8, p<0.01). The different and/or additional anatomical AVV findings were obtained in sixty-one percent of patients by the IP3DE.
Conclusion
IP3DE contributes to successful outcome for AVV repair by obtaining further information on complicated AVV anatomy in congenital heart disease. IP3DE also enables both cardiovascular surgeons and cardiologists to share the accurate and detail “surgeon's view” in the operating room for planning of AVV repair.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- R Numata
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - K Takigiku
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - K Takei
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - Y Akazawa
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - K Yonehara
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - H Obinata
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - T Konuma
- Nagano Children's Hospital, Cardiovascular Surgery, Azumino, Japan
| | - A Kojima
- Nagano Children's Hospital, Cardiovascular Surgery, Azumino, Japan
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4
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Niitsuma-Sugaya I, Kanamori H, Ichikawa S, Fukuhara N, Seike I, Takei K, Baba H, Oshima K, Aoyagi T, Harigae H, Tokuda K. Disseminated gonococcal infection in a patient with paroxysmal nocturnal haemoglobinuria receiving eculizumab. Lancet Infect Dis 2021; 21:741. [PMID: 33894850 DOI: 10.1016/s1473-3099(20)30930-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 11/24/2020] [Indexed: 11/25/2022]
Affiliation(s)
- Ikumi Niitsuma-Sugaya
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hajime Kanamori
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Infection Control, Tohoku University Hospital, Sendai, Japan.
| | - Satoshi Ichikawa
- Department of Hematology, Tohoku University Hospital, Sendai, Japan
| | - Noriko Fukuhara
- Department of Hematology, Tohoku University Hospital, Sendai, Japan
| | - Issei Seike
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kentaro Takei
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hiroaki Baba
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kengo Oshima
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Tetsuji Aoyagi
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hideo Harigae
- Department of Hematology, Tohoku University Hospital, Sendai, Japan
| | - Koichi Tokuda
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Infection Control, Tohoku University Hospital, Sendai, Japan
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5
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Baba H, Kanamori H, Oshima K, Seike I, Niitsuma-Sugaya I, Takei K, Sato Y, Tokuda K, Aoyagi T. Prolonged presence of SARS-CoV-2 in a COVID-19 case with rheumatoid arthritis taking iguratimod treated with ciclesonide. J Infect Chemother 2020; 26:1100-1103. [PMID: 32631736 PMCID: PMC7328613 DOI: 10.1016/j.jiac.2020.06.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 06/18/2020] [Accepted: 06/29/2020] [Indexed: 12/22/2022]
Abstract
We report a coronavirus disease 2019 (COVID-19) case with rheumatoid arthritis taking iguratimod. The patient who continued iguratimod therapy without dose reduction was treated with ciclesonide had an uneventful clinical course, but prolonged detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was observed after resolution of symptoms. The effects of disease-modifying antirheumatic drugs (DMARDs) and ciclesonide on clinical course and viral shedding remain unknown and warrant further investigation.
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Affiliation(s)
- Hiroaki Baba
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan.
| | - Hajime Kanamori
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan; Division of Infection Control, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Kengo Oshima
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
| | - Issei Seike
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Ikumi Niitsuma-Sugaya
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Kentaro Takei
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Yukio Sato
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan; Sendai Medical Imaging Clinic, 2-1-25 Itsutsubashi, Aoba-ku, Sendai, Miyagi, 980-0022, Japan
| | - Koichi Tokuda
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan; Division of Infection Control, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Tetsuji Aoyagi
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan; Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
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6
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Yashi M, Yokoyama M, Fuchizawa H, Okubo N, Kurashina R, Takei K, Suzuki I, Sakamoto K, Nukui A, Fukabori Y, Kamai T. Plasma Progastrin-releasing peptide (ProGRP) level well predicts the degree and duration of PSA response in patients with metastatic castration-resistant prostate cancer underwent enzalutamide. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)33178-5] [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: 12/01/2022] Open
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7
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Sumikawa K, Takei K, Kumagai Y, Shimizu T, Yasui H, Kishimura H. In Silico Analysis of ACE Inhibitory Peptides from Chloroplast Proteins of Red Alga Grateloupia asiatica. Mar Biotechnol (NY) 2020; 22:391-402. [PMID: 32206928 DOI: 10.1007/s10126-020-09959-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 02/25/2020] [Indexed: 06/10/2023]
Abstract
Inhibition of angiotensin I-converting enzyme (ACE) is one of the key factors to repress high blood pressure. Although many studies have been reported that seaweed protein hydrolysates showed the ACE inhibitory activity, the comprehensive understanding of the relationship was still unclear. In this study, we employed chloroplast genome for in silico analysis and compared it with in vitro experiments. We first extracted water-soluble proteins (WSP) from red alga Grateloupia asiatica, which contained mainly PE, PC, APC, and Rbc, and prepared WSP hydrolysate by thermolysin, resulting that the hydrolysate showed ACE inhibitory activity. Then, we determined the complete chloroplast genome of G. asiatica (187,518 bp: 206 protein-coding genes, 29 tRNA, and 3 rRNA) and clarified the amino acid sequences of main WSP, i.e., phycobiliproteins and Rubisco, to perform in silico analysis. Consequently, 190 potential ACE inhibitory peptides existed in the main WSP sequences, and 21 peptides were obtained by in silico thermolysin digestion. By comparing in vitro and in silico analyses, in vitro ACE inhibitory activity was correlated to the IC50 value from in silico digestion. Therefore, in silico approach provides insight into the comprehensive understanding of the potential bioactive peptides from seaweed proteins.
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Affiliation(s)
- Kana Sumikawa
- Chair of Marine Chemical Resource Development, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan
| | - Kentaro Takei
- Chair of Marine Chemical Resource Development, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan
| | - Yuya Kumagai
- Laboratory of Marine Chemical Resource Development, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan
| | - Takeshi Shimizu
- Department of Research and Development, Hokkaido Industrial Technology Center, Hakodate, Hokkaido, 041-0801, Japan
| | - Hajime Yasui
- Laboratory of Humans and the Ocean, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan
| | - Hideki Kishimura
- Laboratory of Marine Chemical Resource Development, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan.
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8
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Suzuki K, Akasaka K, Otsudo T, Mizoguchi Y, Ono K, Tamura A, Hattori H, Hasebe Y, Takei K, Yamamoto M, Hall T. Functional movement screen score and baseball performance in Japanese high school baseball players after corrective exercises. Ann Phys Rehabil Med 2018. [DOI: 10.1016/j.rehab.2018.05.1084] [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]
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9
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Ono K, Akasaka K, Otsudo T, Mizoguchi Y, Suzuki K, Tamura A, Hattori H, Hasebe Y, Takei K, Yamamoto M, Hall T. Effects of neuromuscular training on ankle sprain in junior high school basketball players. Ann Phys Rehabil Med 2018. [DOI: 10.1016/j.rehab.2018.05.1075] [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: 11/16/2022]
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10
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Ogata K, Jeon S, Ko DS, Jung IS, Kim JH, Ito K, Kubo Y, Takei K, Saito S, Cho YH, Park H, Jang J, Kim HG, Kim JH, Kim YS, Choi W, Koh M, Uosaki K, Doo SG, Hwang Y, Han S. Evolving affinity between Coulombic reversibility and hysteretic phase transformations in nano-structured silicon-based lithium-ion batteries. Nat Commun 2018; 9:479. [PMID: 29396479 PMCID: PMC5797158 DOI: 10.1038/s41467-018-02824-w] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Accepted: 01/02/2018] [Indexed: 11/09/2022] Open
Abstract
Nano-structured silicon is an attractive alternative anode material to conventional graphite in lithium-ion batteries. However, the anode designs with higher silicon concentrations remain to be commercialized despite recent remarkable progress. One of the most critical issues is the fundamental understanding of the lithium-silicon Coulombic efficiency. Particularly, this is the key to resolve subtle yet accumulatively significant alterations of Coulombic efficiency by various paths of lithium-silicon processes over cycles. Here, we provide quantitative and qualitative insight into how the irreversible behaviors are altered by the processes under amorphous volume changes and hysteretic amorphous-crystalline phase transformations. Repeated latter transformations over cycles, typically featured as a degradation factor, can govern the reversibility behaviors, improving the irreversibility and eventually minimizing cumulative irreversible lithium consumption. This is clearly different from repeated amorphous volume changes with different lithiation depths. The mechanism behind the correlations is elucidated by electrochemical and structural probing.
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Affiliation(s)
- K Ogata
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea.
- Samsung Research Institute of Japan, Samsung Electronics, 2-1-11, Senba-nishi, Mino-shi, Osaka-fu, 562-0036, Japan.
| | - S Jeon
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea.
| | - D-S Ko
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - I S Jung
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - J H Kim
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - K Ito
- C4GR-GREEN, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Y Kubo
- C4GR-GREEN, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - K Takei
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - S Saito
- Samsung Research Institute of Japan, Samsung Electronics, 2-1-11, Senba-nishi, Mino-shi, Osaka-fu, 562-0036, Japan
| | - Y-H Cho
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - H Park
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - J Jang
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - H-G Kim
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - J-H Kim
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - Y S Kim
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - W Choi
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - M Koh
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - K Uosaki
- C4GR-GREEN, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - S G Doo
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - Y Hwang
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea
| | - S Han
- Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon, Gyeonggi-do, 16678, Korea.
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11
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Hasebe Y, Akasaka K, Otsudo T, Takei K, Yamamoto M. Injury and disorder prevalence and current injury prevention methods in high school soccer players in Japan. Phys Ther Sport 2017. [DOI: 10.1016/j.ptsp.2017.08.007] [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: 11/17/2022]
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12
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Takahashi K, Kurihara Y, Takei K, Takeuchi H, Tanaka F. Lotus protein, an endogenous Nogo receptor antagonist, is involved in inflammation of experimental autoimmune encephalomyelitis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3009] [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]
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13
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Denda S, Takei K, Kumamoto J, Goto M, Denda M. Expression level of Orai3 correlates with aging-related changes in mechanical stimulation-induced calcium signalling in keratinocytes. Exp Dermatol 2017; 26:276-278. [DOI: 10.1111/exd.13175] [Citation(s) in RCA: 4] [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] [Accepted: 08/24/2016] [Indexed: 11/26/2022]
Affiliation(s)
- Sumiko Denda
- Shiseido Global Innovation Center; Yokohama Japan
- Japan Science and Technology Agency; CREST; Kawaguchi Japan
| | - Kentaro Takei
- Japan Science and Technology Agency; CREST; Kawaguchi Japan
- Research Institute for Electronic Science; Hokkaido University; Sapporo Japan
| | - Junichi Kumamoto
- Japan Science and Technology Agency; CREST; Kawaguchi Japan
- Research Institute for Electronic Science; Hokkaido University; Sapporo Japan
| | - Makiko Goto
- Shiseido Global Innovation Center; Yokohama Japan
- Japan Science and Technology Agency; CREST; Kawaguchi Japan
| | - Mitsuhiro Denda
- Shiseido Global Innovation Center; Yokohama Japan
- Japan Science and Technology Agency; CREST; Kawaguchi Japan
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14
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Takei K, Denda S, Nagayama M, Denda M. Role of STIM1-Orai1 system in intra-cellular calcium elevation induced by ATP in cultured human keratinocytes. Exp Dermatol 2016; 25:323-5. [PMID: 26738614 DOI: 10.1111/exd.12928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/16/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Kentaro Takei
- Japan Science and Technology Agency, CREST, Kawaguchi, Japan.,Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan
| | - Sumiko Denda
- Japan Science and Technology Agency, CREST, Kawaguchi, Japan.,Shiseido Research Center, Yokohama, Japan
| | - Masaharu Nagayama
- Japan Science and Technology Agency, CREST, Kawaguchi, Japan.,Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan
| | - Mitsuhiro Denda
- Japan Science and Technology Agency, CREST, Kawaguchi, Japan.,Shiseido Research Center, Yokohama, Japan
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15
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Affiliation(s)
| | - Kentaro Takei
- Research Institute for Electronic Science; Hokkaido University; Sapporo Japan
- Japan Science and Technology Agency; CREST; Tokyo Japan
| | - Mitsuhiro Denda
- Shiseido Research Center; Yokohama Japan
- Japan Science and Technology Agency; CREST; Tokyo Japan
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16
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Takei K, Mitoma C, Hashimoto‐Hachiya A, Takahara M, Tsuji G, Nakahara T, Furue M. Galactomyces
fermentation filtrate prevents T helper 2‐mediated reduction of filaggrin in an aryl hydrocarbon receptor‐dependent manner. Clin Exp Dermatol 2015; 40:786-93. [DOI: 10.1111/ced.12635] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/09/2014] [Indexed: 01/19/2023]
Affiliation(s)
- K. Takei
- Department of DermatologyKyushu University Fukuoka Japan
| | - C. Mitoma
- Department of DermatologyKyushu University Fukuoka Japan
- Research and Clinical Center for Yusho and DioxinKyushu University Fukuoka Japan
| | | | - M. Takahara
- Department of DermatologyKyushu University Fukuoka Japan
| | - G. Tsuji
- Department of DermatologyKyushu University Fukuoka Japan
| | - T. Nakahara
- Department of DermatologyKyushu University Fukuoka Japan
- Division of Skin Surface Sensing Kyushu University Fukuoka Japan
| | - M. Furue
- Department of DermatologyKyushu University Fukuoka Japan
- Research and Clinical Center for Yusho and DioxinKyushu University Fukuoka Japan
- Division of Skin Surface Sensing Kyushu University Fukuoka Japan
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17
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Takei K, Denda S, Kumamoto J, Denda M. Low environmental humidity induces synthesis and release of cortisol in an epidermal organotypic culture system. Exp Dermatol 2014; 22:662-4. [PMID: 24079737 DOI: 10.1111/exd.12224] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/08/2013] [Indexed: 10/26/2022]
Abstract
Dry environmental conditions induce a variety of skin pathologies and a recent report indicating that cortisol synthesis in epidermis was increased during wound healing led us to hypothesize that environmental dryness might induce increased cortisol secretion in epidermis. Therefore, we incubated a skin equivalent model under dry (relative humidity: less than 10%) and humid (relative humidity: approximately 100%) conditions for 48 hours and evaluated cortisol secretion and mRNA levels of cortisol-synthesizing enzyme (steroid 11β-hydroxylase, CYP11B1) and IL-1β. Cortisol secretion was increased threefold, and CYP11B1 and IL-1β mRNAs were increased 38-fold and sixfold, respectively, in the dry condition versus the humid condition. Occlusion with a water-impermeable plastic membrane partially blocked the increases in cortisol secretion and CYP11B1 and IL-1β mRNA expression in the dry condition. Thus, environmental dryness might induce increased cortisol secretion in epidermis of diseased skin characterized by epidermal barrier dysfunction, potentially influencing mental state and systemic physiology.
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Affiliation(s)
- Kentaro Takei
- Japan Science and Technology Agency, CREST, Tokyo, Japan
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18
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Denda M, Denda S, Tsutsumi M, Goto M, Kumamoto J, Nakatani M, Takei K, Kitahata H, Nakata S, Sawabu Y, Kobayashi Y, Nagayama M. Frontiers in epidermal barrier homeostasis--an approach to mathematical modelling of epidermal calcium dynamics. Exp Dermatol 2014; 23:79-82. [PMID: 24330223 DOI: 10.1111/exd.12302] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2013] [Indexed: 01/04/2023]
Abstract
Intact epidermal barrier function is crucial for survival and is associated with the presence of gradients of both calcium ion concentration and electric potential. Although many molecules, including ion channels and pumps, are known to contribute to maintenance of these gradients, the mechanisms involved in epidermal calcium ion dynamics have not been clarified. We have established that a variety of neurotransmitters and their receptors, originally found in the brain, are expressed in keratinocytes and are also associated with barrier homeostasis. Moreover, keratinocytes and neurons show some similarities of electrochemical behaviour. As mathematical modelling and computer simulation have been employed to understand electrochemical phenomena in brain science, we considered that a similar approach might be applicable to describe the dynamics of epidermal electrochemical phenomena associated with barrier homeostasis. Such methodology would also be potentially useful to address a number of difficult problems in clinical dermatology, such as ageing and itching. Although this work is at a very early stage, in this essay, we discuss the background to our approach and we present some preliminary results of simulation of barrier recovery.
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Affiliation(s)
- Mitsuhiro Denda
- Japan Science and Technology Agency, CREST, Tokyo, Japan; Shiseido Research Center, Yokohama, Japan
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Kiba T, Takei K, Kojima M, Sakakibara H. Side-chain modification of cytokinins controls shoot growth in Arabidopsis. Dev Cell 2014; 27:452-61. [PMID: 24286826 DOI: 10.1016/j.devcel.2013.10.004] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 09/12/2013] [Accepted: 10/09/2013] [Indexed: 01/25/2023]
Abstract
Cytokinins (CKs), a class of plant hormones, are central regulators of plant growth and development. Based on numerous physiological and genetic studies, the quantitative regulation of cytokinin levels is the major mechanism regulating cytokinin action in diverse developmental processes. Here, we identified a different mechanism with which the physiological function of CK is modulated through side-chain modification (trans-hydroxylation). The trans-hydroxylation that forms trans-zeatin (tZ)-type CK from N(6)-(Δ(2)-isopentenyl)adenine (iP)-type CK is catalyzed by the cytochrome P450 enzymes CYP735A1 and CYP735A2 in Arabidopsis. Deficiency in trans-hydroxylation activity results in dramatic retardation of shoot growth without affecting total CK quantity, while augmentation of the activity enhances shoot growth. Application of exogenous tZ but not iP recovers the wild-type phenotype in the mutants, indicating that trans-hydroxylation modifies the physiological function of CK. We propose that the control of cytokinin function by side-chain modification is crucial for shoot growth regulation in plants.
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Affiliation(s)
- Takatoshi Kiba
- RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama 230-0045, Japan
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Kumamoto JI, Nakatani M, Tsutsumi M, Goto M, Denda S, Takei K, Denda M. Coculture system of keratinocytes and dorsal-root-ganglion-derived cells for screening neurotrophic factors involved in guidance of neuronal axon growth in the skin. Exp Dermatol 2013; 23:58-60. [DOI: 10.1111/exd.12288] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2013] [Indexed: 12/17/2022]
Affiliation(s)
| | - Masashi Nakatani
- CREST; Japan Science and Technology Agency; Tokyo Japan
- Japan Society for the Promotion of Science; Tokyo Japan
| | - Moe Tsutsumi
- CREST; Japan Science and Technology Agency; Tokyo Japan
- Shiseido Research Center; Yokohama Japan
| | - Makiko Goto
- CREST; Japan Science and Technology Agency; Tokyo Japan
- Shiseido Research Center; Yokohama Japan
| | - Sumiko Denda
- CREST; Japan Science and Technology Agency; Tokyo Japan
- Shiseido Research Center; Yokohama Japan
| | - Kentaro Takei
- CREST; Japan Science and Technology Agency; Tokyo Japan
| | - Mitsuhiro Denda
- CREST; Japan Science and Technology Agency; Tokyo Japan
- Shiseido Research Center; Yokohama Japan
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Kiba T, Takei K, Kojima M, Sakakibara H. Side-chain modification of cytokinins controls shoot growth in Arabidopsis. Dev Cell 2013. [PMID: 24286826 DOI: 10.1016/j.devce1.2013.10.004] [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: 04/17/2023]
Abstract
Cytokinins (CKs), a class of plant hormones, are central regulators of plant growth and development. Based on numerous physiological and genetic studies, the quantitative regulation of cytokinin levels is the major mechanism regulating cytokinin action in diverse developmental processes. Here, we identified a different mechanism with which the physiological function of CK is modulated through side-chain modification (trans-hydroxylation). The trans-hydroxylation that forms trans-zeatin (tZ)-type CK from N(6)-(Δ(2)-isopentenyl)adenine (iP)-type CK is catalyzed by the cytochrome P450 enzymes CYP735A1 and CYP735A2 in Arabidopsis. Deficiency in trans-hydroxylation activity results in dramatic retardation of shoot growth without affecting total CK quantity, while augmentation of the activity enhances shoot growth. Application of exogenous tZ but not iP recovers the wild-type phenotype in the mutants, indicating that trans-hydroxylation modifies the physiological function of CK. We propose that the control of cytokinin function by side-chain modification is crucial for shoot growth regulation in plants.
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Affiliation(s)
- Takatoshi Kiba
- RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama 230-0045, Japan
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22
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Yoshino R, Tomizawa Y, Takei K, Kuwako T, Yoshii A, Watanabe S, Saitou R. Retrospective Analysis of Re-Challenge of EGFR TK-IS in Patients with Advanced and Recurrent Non-Small Cell Lung Cancer. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.148] [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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Sasaki E, Ogura T, Takei K, Kojima M, Kitahata N, Sakakibara H, Asami T, Shimada Y. Uniconazole, a cytochrome P450 inhibitor, inhibits trans-zeatin biosynthesis in Arabidopsis. Phytochemistry 2013; 87:30-8. [PMID: 23280040 DOI: 10.1016/j.phytochem.2012.11.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 10/03/2012] [Accepted: 11/30/2012] [Indexed: 05/22/2023]
Abstract
Cytokinin (CK) is a plant hormone that plays important regulatory roles in many aspects of plant growth and development. Although functions of CK and its biosynthesis pathway have been studied extensively, there is still no efficient biosynthesis inhibitor, which would be useful for studying CK from a chemical genetic approach. Here, CK biosynthesis inhibitor candidates were searched for using a systematic approach. In silico screening of candidates were carried out using genome-wide gene expression profiles and prediction of target sites using global CK accumulation profile analysis. As a result of these screenings, it was found that uniconazole, a well known inhibitor of cytochrome P450 monooxygenase, prevents the biosynthesis of trans-zeatin, and that its target is CYP735As in Arabidopsis.
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Affiliation(s)
- Eriko Sasaki
- RIKEN Plant Science Center, 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan
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24
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Denda M, Takei K, Denda S. How does epidermal pathology interact with mental state? Med Hypotheses 2013; 80:194-6. [DOI: 10.1016/j.mehy.2012.11.027] [Citation(s) in RCA: 16] [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] [Received: 09/20/2012] [Revised: 11/15/2012] [Accepted: 11/18/2012] [Indexed: 01/19/2023]
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Denda S, Takei K, Kumamoto J, Goto M, Tsutsumi M, Denda M. Oxytocin is expressed in epidermal keratinocytes and released upon stimulation with adenosine 5'-[γ-thio]triphosphate in vitro. Exp Dermatol 2012; 21:535-7. [PMID: 22583056 DOI: 10.1111/j.1600-0625.2012.01507.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2012] [Indexed: 01/15/2023]
Abstract
Oxytocin is a neuropeptide produced primarily in the hypothalamus and is best known for its roles in parturition and lactation. It also influences behaviour, memory and mental state. Recent studies have suggested a variety of roles for oxytocin in peripheral tissues, including skin. Here we show that oxytocin is expressed in human skin. Immunohistochemical studies showed that oxytocin and its carrier protein, neurophysin I, are predominantly localized in epidermis. RT-PCR confirmed the expression of oxytocin in both skin and cultured epidermal keratinocytes. We also show that oxytocin is released from keratinocytes after application of adenosine 5'-[γ-thio]triphosphate (ATPγS, a stable analogue of ATP) in a dose-dependent manner. The ATPγS-induced oxytocin release was inhibited by removal of extracellular calcium, or by the P2X receptor antagonist 2',3'-O-(2,4,6-trinitrophenyl)adenosine 5'-triphosphate (TNP-ATP). These results suggest that oxytocin is produced in human epidermal keratinocytes and is released in response to calcium influx via P2X receptors.
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Maekawa Y, Sakamoto T, Umezu K, Ohashi N, Harada Y, Yasukochi S, Takigiku K, Takei K, Nakano Y, Inoue N, Otagiri T, Hashida Y. [Senning operation for transposition of great arteries in a premature baby]. Kyobu Geka 2010; 63:1028-1031. [PMID: 21066841] [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: 05/30/2023]
Abstract
A male baby was delivered by emergency cesarean section due to fetal distress at 30 weeks of gestational age with a birth weight of 813 g. By fetal echocardiography, the patient had been diagnosed with transposition of great arteries (type 1). Early two-staged arterial switch operation was planned after 34 gestational age avoiding intracranial hemorrhage under cardiopulmonary bypass. At 19 days of life, vegetation was revealed on the pulmonary valve by echocardiography, so he was diagnosed as infectious endocarditis. Cefotaxime and gamma-globulin were given intravenously for 4 weeks. While waiting for the increase in the body weight, desaturation from chronic respiratory distress syndrome was exacerbated. At 8 months old, urgent Senning operation was performed to improve desaturation. The patient was discharged at 20 post operative day. We conclude that Senning operation can be feasible operation in such a complicated case.
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Affiliation(s)
- Y Maekawa
- Division of Cardiovascular Surgery, Nagano Children's Hospital, Azumino, Japan
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27
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Blanco R, Takei K, Romero E. Leptospiral glycolipoprotein as a candidate antigen for serodiagnosis of human leptospirosis. Lett Appl Microbiol 2009; 49:267-73. [DOI: 10.1111/j.1472-765x.2009.02650.x] [Citation(s) in RCA: 10] [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: 11/28/2022]
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28
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Kojima M, Kamada-Nobusada T, Komatsu H, Takei K, Kuroha T, Mizutani M, Ashikari M, Ueguchi-Tanaka M, Matsuoka M, Suzuki K, Sakakibara H. Highly sensitive and high-throughput analysis of plant hormones using MS-probe modification and liquid chromatography-tandem mass spectrometry: an application for hormone profiling in Oryza sativa. Plant Cell Physiol 2009; 50:1201-14. [PMID: 19369275 PMCID: PMC2709547 DOI: 10.1093/pcp/pcp057] [Citation(s) in RCA: 317] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2009] [Accepted: 04/12/2009] [Indexed: 05/18/2023]
Abstract
We have developed a highly sensitive and high-throughput method for the simultaneous analysis of 43 molecular species of cytokinins, auxins, ABA and gibberellins. This method consists of an automatic liquid handling system for solid phase extraction and ultra-performance liquid chromatography (UPLC) coupled with a tandem quadrupole mass spectrometer (qMS/MS) equipped with an electrospray interface (ESI; UPLC-ESI-qMS/MS). In order to improve the detection limit of negatively charged compounds, such as gibberellins, we chemically derivatized fractions containing auxin, ABA and gibberellins with bromocholine that has a quaternary ammonium functional group. This modification, that we call 'MS-probe', makes these hormone derivatives have a positive ion charge and permits all compounds to be measured in the positive ion mode with UPLC-ESI-qMS/MS in a single run. Consequently, quantification limits of gibberellins increased up to 50-fold. Our current method needs <100 mg (FW) of plant tissues to determine phytohormone profiles and enables us to analyze >180 plant samples simultaneously. Application of this method to plant hormone profiling enabled us to draw organ distribution maps of hormone species in rice and also to identify interactions among the four major hormones in the rice gibberellin signaling mutants, gid1-3, gid2-1 and slr1. Combining the results of hormone profiling data with transcriptome data in the gibberellin signaling mutants allows us to analyze relationships between changes in gene expression and hormone metabolism.
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Affiliation(s)
- Mikiko Kojima
- RIKEN Plant Science Center, 1-7-22, Suehiro, Tsurumi, Yokohama, 230-0045 Japan
| | | | - Hirokazu Komatsu
- Faculty of Science and Technology, Keio University, Kohoku, Yokohama, 223-8522 Japan
| | - Kentaro Takei
- RIKEN Plant Science Center, 1-7-22, Suehiro, Tsurumi, Yokohama, 230-0045 Japan
| | - Takeshi Kuroha
- RIKEN Plant Science Center, 1-7-22, Suehiro, Tsurumi, Yokohama, 230-0045 Japan
| | - Masaharu Mizutani
- Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada, Kobe, 657-8501 Japan
| | - Motoyuki Ashikari
- Bioscience and Biotechnology Center, Nagoya University, Nagoya, 464-8601 Japan
| | | | - Makoto Matsuoka
- Bioscience and Biotechnology Center, Nagoya University, Nagoya, 464-8601 Japan
| | - Koji Suzuki
- Faculty of Science and Technology, Keio University, Kohoku, Yokohama, 223-8522 Japan
| | - Hitoshi Sakakibara
- RIKEN Plant Science Center, 1-7-22, Suehiro, Tsurumi, Yokohama, 230-0045 Japan
- *Corresponding author: E-mail, ; Fax, +81-45-503-9609
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Iketani M, Imaizumi C, Nakamura F, Jeromin A, Mikoshiba K, Goshima Y, Takei K. Regulation of neurite outgrowth mediated by neuronal calcium sensor-1 and inositol 1,4,5-trisphosphate receptor in nerve growth cones. Neuroscience 2009; 161:743-52. [PMID: 19368896 DOI: 10.1016/j.neuroscience.2009.04.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Revised: 04/06/2009] [Accepted: 04/06/2009] [Indexed: 11/26/2022]
Abstract
Calcium acts as an important second messenger in the intracellular signal pathways in a variety of cell functions. Strictly controlled intracellular calcium is required for proper neurite outgrowth of developing neurons. However, the molecular mechanisms of this process are still largely unknown. Neuronal calcium sensor-1 (NCS-1) is a high-affinity and low-capacity calcium binding protein, which is specifically expressed in the nervous system. NCS-1 was distributed throughout the entire region of growth cones located at a distal tip of neurite in cultured chick dorsal root ganglion neurons. In the central domain of the growth cone, however, NCS-1 was distributed in a clustered specific pattern and co-localized with the type 1 inositol 1,4,5-trisphosphate receptor (InsP(3)R1). The pharmacological inhibition of InsP(3) receptors decreased the clustered specific distribution of NCS-1 in the growth cones and inhibited neurite outgrowth but did not change the growth cone morphology. The acute and localized loss of NCS-1 function in the growth cone induced by chromophore-assisted laser inactivation (CALI) resulted in the growth arrest of neurites and lamellipodial and filopodial retractions. These findings suggest that NCS-1 is involved in the regulation of both neurite outgrowth and growth cone morphology. In addition, NCS-1 is functionally linked to InsP(3)R1, which may play an important role in the regulation of neurite outgrowth.
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Affiliation(s)
- M Iketani
- Department of Molecular Pharmacology and Neurobiology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Barreto AMEC, Takei K, E C S, Bellesa MAO, Salles NA, Barreto CC, Nishiya AS, Chamone DF. Cost-effective analysis of different algorithms for the diagnosis of hepatitis C virus infection. ACTA ACUST UNITED AC 2008; 41:126-34. [PMID: 18235967 DOI: 10.1590/s0100-879x2008005000004] [Citation(s) in RCA: 9] [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] [Received: 05/11/2007] [Accepted: 11/26/2007] [Indexed: 11/21/2022]
Abstract
We compared the cost-benefit of two algorithms, recently proposed by the Centers for Disease Control and Prevention, USA, with the conventional one, the most appropriate for the diagnosis of hepatitis C virus (HCV) infection in the Brazilian population. Serum samples were obtained from 517 ELISA-positive or -inconclusive blood donors who had returned to Fundação Pró-Sangue/Hemocentro de São Paulo to confirm previous results. Algorithm A was based on signal-to-cut-off (s/co) ratio of ELISA anti-HCV samples that show s/co ratio > or =95% concordance with immunoblot (IB) positivity. For algorithm B, reflex nucleic acid amplification testing by PCR was required for ELISA-positive or -inconclusive samples and IB for PCR-negative samples. For algorithm C, all positive or inconclusive ELISA samples were submitted to IB. We observed a similar rate of positive results with the three algorithms: 287, 287, and 285 for A, B, and C, respectively, and 283 were concordant with one another. Indeterminate results from algorithms A and C were elucidated by PCR (expanded algorithm) which detected two more positive samples. The estimated cost of algorithms A and B was US$21,299.39 and US$32,397.40, respectively, which were 43.5 and 14.0% more economic than C (US$37,673.79). The cost can vary according to the technique used. We conclude that both algorithms A and B are suitable for diagnosing HCV infection in the Brazilian population. Furthermore, algorithm A is the more practical and economical one since it requires supplemental tests for only 54% of the samples. Algorithm B provides early information about the presence of viremia.
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Affiliation(s)
- A M E C Barreto
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, SP, Brasil.
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Hirose N, Takei K, Kuroha T, Kamada-Nobusada T, Hayashi H, Sakakibara H. Regulation of cytokinin biosynthesis, compartmentalization and translocation. J Exp Bot 2008; 59:75-83. [PMID: 17872922 DOI: 10.1093/jxb/erm157] [Citation(s) in RCA: 265] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Cytokinins, a group of mobile phytohormones, play an important role in plant growth and development, and their activity is finely controlled by environmental factors in the control of morphogenic and metabolic adaptations. Inorganic nitrogen sources, such as nitrate, are a major factor regulating gene expression of adenosine phosphate-isopentenyltransferase (IPT), a key enzyme of cytokinin biosynthesis. Modulation of IPT and macronutrient transporter gene expression in response to nitrate, sulphate and phosphate, and cytokinin-dependent repression of the transporter genes suggest that cytokinins play a critical role in balancing acquisition and distribution of macronutrients. Biased distribution of trans-zeatin (tZ)-type cytokinins in xylem and N(6)-(Delta(2)-isopentenyl)adenine (iP)-type cytokinins in phloem saps suggest that, in addition to acting as local signals, cytokinins communicate acropetal and systemic long-distance signals, and that structural side chain variations mediate different biological messages. The compartmentalization of tZ- and iP-type cytokinins implies the involvement of a selective transport system. Recent studies have raised the possibility of subsets of the purine permease family as a transporter of cytokinin nucleobases and equilibrative nucleoside transporters (ENT) for cytokinin nucleosides. These biochemical and transgenic data suggest that AtENT6, an Arabidopsis ENT, could also participate in cytokinin nucleoside transport with a preference for iP riboside in vascular tissue.
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Affiliation(s)
- Naoya Hirose
- RIKEN Plant Science Center, Suehiro 1-7-22, Tsurumi, Yokohama 230-0045, Japan
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32
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Sakakibara H, Takei K, Hirose N, Kuroha T, Kamada-Nobusada T. Regulation of cytokinin metabolism and translocation. Comp Biochem Physiol A Mol Integr Physiol 2007. [DOI: 10.1016/j.cbpa.2007.01.538] [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: 10/23/2022]
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33
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Sakakibara H, Takei K, Hirose N. Interactions between nitrogen and cytokinin in the regulation of metabolism and development. Trends Plant Sci 2006; 11:440-8. [PMID: 16899391 DOI: 10.1016/j.tplants.2006.07.004] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Revised: 06/15/2006] [Accepted: 07/25/2006] [Indexed: 05/11/2023]
Abstract
Inorganic nitrogen is a substrate for nitrogen assimilation and also functions as a signal triggering widespread changes in gene expression that modulate metabolism and development. To integrate the actions of the nitrogen signal at the whole plant level, plants use multiple signaling routes that communicate internal and external nitrogen status. One route depends on nitrate itself and one uses cytokinin as a messenger. Recent genome-wide research has shown that the nitrate-specific signal regulates a wide variety of metabolic processes including nitrogen and carbon metabolism, and cytokinin biosynthesis. Cytokinin-mediated signaling is related to the control of development, protein synthesis and acquisition of macronutrients. The coordination and interaction of both regulatory pathways is important for normal plant growth under variable nitrogen supply conditions.
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Affiliation(s)
- Hitoshi Sakakibara
- RIKEN Plant Science Center, 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
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Pedro ABP, Romaldini JH, Americo C, Takei K. Association of circulating antibodies against double-stranded and single-stranded DNA with thyroid autoantibodies in Graves' disease and Hashimoto's thyroiditis patients. Exp Clin Endocrinol Diabetes 2006; 114:35-8. [PMID: 16450315 DOI: 10.1055/s-2005-873005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 10/25/2022]
Abstract
The occurrence of antinuclear antibody (ANA), rheumatoid factor (RF), antibodies to double-stranded DNA (anti-dsDNA) and to single-stranded DNA (anti-ssDNA) was investigated in 51 patients with autoimmune thyroid diseases (AITD), and in 25 matched control subjects. In comparison with controls, the prevalence of anti-dsDNA was 74.5% in AITD patients (p=0.0001), 82.0% in 39 hyperthyroid Graves' disease (GD) (p=0.0001), and 50.0% in 12 euthyroid Hashimoto's thyroiditis (HT) patients (p=0.0001). The prevalence of anti-ssDNA was 90.1% in AITD (94.8% in GD and 75% in HT; p=0.001). The concentration of both anti-dsDNA and anti-ssDNA were higher (p=0.002) in AITD, in GD (p=0.001), and in HT (p=0.01) patients than in controls. Two patients with AITD were identified as positive for ANA. RF was detected in 4 AITD patients. Positive correlation was noted between anti-dsDNA with T4 (p=0.001), T3 (p=0.002), thyroid peroxidase antibody (anti-TPO) (p=0.0001), and TSH (p=0.001) values but not with thyroglobulin antibody (anti-Tg). Serum anti-ssDNA values were also correlated with T3 (p=0.0001), TSH (p=0.003), and anti-TPO (p=0.0001). However, by using a multiple regression analysis only anti-TPO remained associated with anti-dsDNA and both anti-Tg and anti-TPO with anti-ssDNA values. The predisposition to develop systemic autoimmune disorders is not influenced by thyroid hormones. The elevated prevalence of serum anti-dsDNA and anti-ssDNA in AITD patients points out that we must be aware of the risk for predisposition for the development of other systemic autoimmune diseases.
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Affiliation(s)
- A B P Pedro
- Department of Endocrinology & Clinical Laboratory, Hospital do Servidor Público Estadual, IAMSPE, São Paulo, Brazil
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Abstract
In intact plants, the shoot apex grows predominantly and inhibits outgrowth of axillary buds. After decapitation of the shoot apex, outgrowth of axillary buds begins. This phenomenon is called an apical dominance. Although the involvement of auxin, which represses outgrowth of axillary buds, and cytokinin (CK), which promotes outgrowth of axillary buds, has been proposed, little is known about the underlying molecular mechanisms. In the present study, we demonstrated that auxin negatively regulates local CK biosynthesis in the nodal stem by controlling the expression level of the pea (Pisum sativum L.) gene adenosine phosphate-isopentenyltransferase (PsIPT), which encodes a key enzyme in CK biosynthesis. Before decapitation, PsIPT1 and PsIPT2 transcripts were undetectable; after decapitation, they were markedly induced in the nodal stem along with accumulation of CK. Expression of PsIPT was repressed by the application of indole-3-acetic acid (IAA). In excised nodal stem, PsIPT expression and CK levels also increased under IAA-free conditions. Furthermore, beta-glucuronidase expression, under the control of the PsIPT2 promoter region in transgenic Arabidopsis, was repressed by an IAA. Our results indicate that in apical dominance one role of auxin is to repress local biosynthesis of CK in the nodal stem and that, after decapitation, CKs, which are thought to be derived from the roots, are locally biosynthesized in the nodal stem rather than in the roots.
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Affiliation(s)
- Mina Tanaka
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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Sakamoto Y, Mashiko K, Matsumoto H, Hara Y, Kutsukata N, Takei K, Ueno Y, Tomita Y, Yamamoto Y. Crit Care 2006; 10:P291. [DOI: 10.1186/cc4638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Sakakibara H, Kasahara H, Ueda N, Kojima M, Takei K, Hishiyama S, Asami T, Okada K, Kamiya Y, Yamaya T, Yamaguchi S. Agrobacterium tumefaciens increases cytokinin production in plastids by modifying the biosynthetic pathway in the host plant. Proc Natl Acad Sci U S A 2005; 102:9972-7. [PMID: 15998742 PMCID: PMC1174980 DOI: 10.1073/pnas.0500793102] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Agrobacterium tumefaciens infects plants and induces the formation of tumors called "crown galls" by integrating the transferred-DNA (T-DNA) region of the Ti-plasmid into the plant nuclear genome. Tumors are formed because the T-DNA encodes enzymes that modify the synthesis of two plant growth hormones, auxin and cytokinin (CK). Here, we show that a CK biosynthesis enzyme, Tmr, which is encoded by the Agrobacterium T-DNA region, is targeted to and functions in plastids of infected plant cells, despite having no typical plastid-targeting sequence. Evidence is provided that Tmr is an adenosine phosphate-isopentenyltransferase (IPT) that creates a new CK biosynthesis bypass by using 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate (HMBDP) as a substrate. Unlike in the conventional CK biosynthesis pathway in plants, trans-zeatin-type CKs are produced directly without the requirement for P450 monooxygenase-mediated hydroxylation. Consistent with the plastid localization of Tmr, HMBDP is an intermediate in the methylerythritol phosphate pathway, a plastid-localized biosynthesis route for universal isoprenoid precursors. These results demonstrate that A. tumefaciens modifies CK biosynthesis by sending a key enzyme into plastids of the host plant to promote tumorigenesis.
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Affiliation(s)
- Hitoshi Sakakibara
- Laboratories for Communication Mechanisms and Cellular Growth and Development, Plant Science Center, RIKEN, Suehiro 1-7-22, Tsurumi, Yokohama 230-0045, Japan.
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Luyo-Acero GE, Uezato H, Oshiro M, Takei K, Kariya K, Katakura K, Gomez-Landires E, Hashiguchi Y, Nonaka S. Sequence variation of the cytochrome b gene of various human infecting members of the genus Leishmania and their phylogeny. Parasitology 2004; 128:483-91. [PMID: 15180316 DOI: 10.1017/s0031182004004792] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [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: 11/06/2022]
Abstract
The Cytochrome b (Cyt b) gene has proved to be useful for identification and classification of many mammals and plants. In order to evaluate the utility of this gene for discrimination of Leishmania parasites as well as for exploring their phylogenetic relationships, we determined the nucleotide sequences of the Cyt b gene from 13 human-infecting Leishmania species (14 strains) from the New and Old Worlds. The Cyt b genes, approximately 1080 base pairs, were found to be A/T rich, and their 5' terminal-editing regions were highly conserved. The nucleotide sequence variation among them was enough to discriminate parasite species; 245 nucleotide positions were polymorphic and 190 positions were parsimony informative. The phylogenetic relationships based on this gene, showed good agreement with the classification of Lainson & Shaw (1987) except for the inclusion of L. (L.) major in the L. (L.) tropica complex and the placement of L. tarentolae in another genus. These data show that the Cyt b gene is useful for phylogenetic study of Leishmania parasites.
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Affiliation(s)
- G E Luyo-Acero
- Department of Dermatology, Faculty of Medicine, University of the Ryukyus, 207 Uehara, Nishihara-cho, Okinawa 903-0125, Japan
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Takei K, Ueda N, Aoki K, Kuromori T, Hirayama T, Shinozaki K, Yamaya T, Sakakibara H. AtIPT3 is a key determinant of nitrate-dependent cytokinin biosynthesis in Arabidopsis. Plant Cell Physiol 2004; 45:1053-62. [PMID: 15356331 DOI: 10.1093/pcp/pch119] [Citation(s) in RCA: 228] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We analyzed the spatial expression pattern of Arabidopsis thaliana adenosine phosphates-isopentenyltransferase genes (AtIPT1, AtIPT3 to AtIPT8) and the effect of inorganic nitrogen sources on their regulation. In mature plants, the AtIPTs were differentially expressed in various tissues including the roots, leaves, stems, flowers and siliques. In transgenic seedlings expressing a gene for green fluorescent protein (GFP) driven by the AtIPT promoters, AtIPT1::GFP was predominantly expressed in the vascular stele of the roots, AtIPT3::GFP was in the phloem companion cells, AtIPT5::GFP was in the lateral root primordium and pericycle, and AtIPT7::GFP was in both the vascular stele and the phloem companion cells of the roots. In a long-term treatment, the accumulation level of AtIPT5 transcript was correlated with the concentrations of NO(3)(-) and NH(4)(+) in the growth medium. However, under nitrogen-limited conditions, AtIPT3 expression was rapidly induced by NO(3)(-) in the seedlings accompanying the accumulation of cytokinins, whereas AtIPT5 expression was little affected. The NO(3)(-)-dependent accumulation of both the AtIPT3 transcript and the cytokinins was markedly reduced in a Ds transposon-insertion mutant of AtIPT3. These results suggest that nitrogen availability differentially regulates expression of AtIPT3 and AtIPT5, and that AtIPT3 is a key determinant of cytokinin biosynthesis in response to rapid changes in the availability of NO(3)(-).
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Affiliation(s)
- Kentaro Takei
- Plant Science Center, RIKEN (Institute of Physical and Chemical Research), Suehiro 1-7-22, Tsurumi, Yokohama, 230-0045 Japan
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Takei K, Yamaya T, Sakakibara H. Arabidopsis CYP735A1 and CYP735A2 encode cytokinin hydroxylases that catalyze the biosynthesis of trans-Zeatin. J Biol Chem 2004; 279:41866-72. [PMID: 15280363 DOI: 10.1074/jbc.m406337200] [Citation(s) in RCA: 243] [Impact Index Per Article: 12.2] [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: 11/06/2022] Open
Abstract
Cytokinins (CKs), a group of phytohormones, are adenine derivatives that carry either an isoprene-derived or an aromatic side chain at the N(6) terminus. trans-Zeatin (tZ), an isoprenoid CK, is assumed to play a central physiological role because of its general occurrence and high activity in bioassays. Although hydroxylation of isopentenyladenine-type CKs is a key step of tZ biosynthesis, the catalyzing enzyme has not been characterized yet. Here we demonstrate that CYP735A1 and CYP735A2 are cytochrome P450 monooxygenases (P450s) that catalyze the biosynthesis of tZ. We identified the genes from Arabidopsis using an adenosine phosphate-isopentenyltransferase (AtIPT4)/P450 co-expression system in yeast. Co-expression of AtIPT4 and CYP735A enabled yeast to excrete tZ and the nucleosides to the culture medium. In vitro, both CYP735As preferentially utilized isopentenyladenine nucleotides rather than the nucleoside and free base forms and produced tZ nucleotides but not the cis-isomer. The expression of CYP735A1 and CYP735A2 was differentially regulated in terms of organ specificity and response to CK. Root-specific induction of CYP735A2 expression by CK suggests that the trans-hydroxylation is involved in the regulation of CK metabolism and signaling in roots.
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Affiliation(s)
- Kentaro Takei
- Plant Science Center, RIKEN, Suehiro 1-7-22, Tsurumi, Yokohama 230-0045, Japan
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Yamazaki T, Sawada U, Kura Y, Ito T, Hatta Y, Takeuchi J, Takei K, Uenogawa K, Saiki M. Combination of rituximab with dose-intensified CHOP (double-CHOP) followed by high-dose chemotherapy for high risk diffuse large B-cell lymphomas (DLBL). J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.6684] [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: 11/20/2022] Open
Affiliation(s)
- T. Yamazaki
- Nihon University School of Medicine, Tokyo, Japan
| | - U. Sawada
- Nihon University School of Medicine, Tokyo, Japan
| | - Y. Kura
- Nihon University School of Medicine, Tokyo, Japan
| | - T. Ito
- Nihon University School of Medicine, Tokyo, Japan
| | - Y. Hatta
- Nihon University School of Medicine, Tokyo, Japan
| | - J. Takeuchi
- Nihon University School of Medicine, Tokyo, Japan
| | - K. Takei
- Nihon University School of Medicine, Tokyo, Japan
| | - K. Uenogawa
- Nihon University School of Medicine, Tokyo, Japan
| | - M. Saiki
- Nihon University School of Medicine, Tokyo, Japan
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Kasahara H, Takei K, Ueda N, Hishiyama S, Yamaya T, Kamiya Y, Yamaguchi S, Sakakibara H. Distinct isoprenoid origins of cis- and trans-zeatin biosyntheses in Arabidopsis. J Biol Chem 2004; 279:14049-54. [PMID: 14726522 DOI: 10.1074/jbc.m314195200] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.9] [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: 11/06/2022] Open
Abstract
Plants produce the common isoprenoid precursors isopentenyl diphosphate and dimethylallyl diphosphate (DMAPP) through the methylerythritol phosphate (MEP) pathway in plastids and the mevalonate (MVA) pathway in the cytosol. To assess which pathways contribute DMAPP for cytokinin biosynthesis, metabolites from each isoprenoid pathway were selectively labeled with (13)C in Arabidopsis seedlings. Efficient (13)C labeling was achieved by blocking the endogenous pathway genetically or chemically during the feed of a (13)C labeled precursor specific to the MEP or MVA pathways. Liquid chromatography-mass spectrometry analysis demonstrated that the prenyl group of trans-zeatin (tZ) and isopentenyladenine is mainly produced through the MEP pathway. In comparison, a large fraction of the prenyl group of cis-zeatin (cZ) derivatives was provided by the MVA pathway. When expressed as fusion proteins with green fluorescent protein in Arabidopsis cells, four adenosine phosphate-isopentenyltransferases (AtIPT1, AtIPT3, AtIPT5, and AtIPT8) were found in plastids, in agreement with the idea that the MEP pathway primarily provides DMAPP to tZ and isopentenyladenine. On the other hand, AtIPT2, a tRNA isopentenyltransferase, was detected in the cytosol. Because the prenylated adenine moiety of tRNA is usually of the cZ type, the formation of cZ in Arabidopsis seedlings might involve the transfer of DMAPP from the MVA pathway to tRNA. Distinct origins of large proportions of DMAPP for tZ and cZ biosynthesis suggest that plants are able to separately modulate the level of these cytokinin species.
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Affiliation(s)
- Hiroyuki Kasahara
- Laboratory for Cellular Growth and Development, Plant Science Center, RIKEN, Yokohoma, Japan
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Lee JH, Takei K, Sakakibara H, Sun Cho H, Kim DM, Kim YS, Min SR, Kim WT, Sohn DY, Lim YP, Pai HS. CHRK1, a chitinase-related receptor-like kinase, plays a role in plant development and cytokinin homeostasis in tobacco. Plant Mol Biol 2003; 53:877-90. [PMID: 15082932 DOI: 10.1023/b:plan.0000023668.34205.a8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
CHRK1 encodes a receptor-like kinase that contains a chitinase-related sequence in the extracellular domain in Nicotiana tabacum. In this study, we showed that CHRK1 is mainly expressed in the shoot apex region including leaf primordia and young leaves, and germinating seedlings and vascular tissues, based on GUS activity of transgenic tobacco plants carrying the CHRK1 promoter-GUS fusion gene. Transgenic tobacco plants in which CHRK1 expression was suppressed exhibited pleiotrophic developmental abnormality, including formation of proliferating shooty calli from emerging seedlings and severely altered seedling development. At the cellular level, ectopic cell proliferation, reduced cell specificity, and aberrant chloroplast development were observed. The transgenic lines contained 3-fold higher level of cytokinin than the wild-type plants. Consistently, the transgenic seedlings exhibited a typical cytokinin response in the absence of hormone, such as deetiolation under the dark. Based on these results, we propose that CHRK1 is involved in a developmental signaling pathway regulating cell proliferation/differentiation and the endogenous cytokinin levels in tobacco.
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Affiliation(s)
- Jeong Hee Lee
- Laboratory of Plant Genomics, Korea Research Institute of Bioscience and Biotechnology, Yusong, Taejon 305-333, Korea
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Takei K, Dekishima Y, Eguchi T, Yamaya T, Sakakibara H. A new method for enzymatic preparation of isopentenyladenine-type and trans-zeatin-type cytokinins with radioisotope-labeling. J Plant Res 2003; 116:259-263. [PMID: 12728344 DOI: 10.1007/s10265-003-0098-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2002] [Accepted: 03/06/2003] [Indexed: 05/24/2023]
Abstract
We describe a new enzymatic reaction method for the preparation of the radioisotope-labeled cytokinins isopentenyladenine (iP), trans-zeatin (tZ), and their ribosides. The method is based on the three enzyme activities of an adenylate isopentenyltransferase (IPT; EC 2.5.1.27) from Arabidopsis thaliana, an alkaline phosphatase (EC 3.1.3.1) from calf intestine, and a purine-nucleoside phosphorylase (EC 2.4.2.1) from Escherichia coli. The A. thaliana IPT, AtIPT7, utilized both dimethylallyldiphosphate and 4-hydroxy-3-methyl-2-( E)-butenyl diphosphate as isoprenoid donors. The dual specificity of the substrates enabled us to produce iP-type and tZ-type cytokinins separately in the same system simply by switching the substrates. Our method affords a much higher yield of the labeled products than the chemical reaction methods previously used. These labeled compounds will be useful tools for cytokinin research, such as receptor-ligand assays and cell metabolism studies.
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Affiliation(s)
- Kentaro Takei
- Plant Science Center, RIKEN (The Institute of Physical and Chemical Research), 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan
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Takei K, Yamaya T, Sakakibara H. A method for separation and determination of cytokinin nucleotides from plant tissues. J Plant Res 2003; 116:265-269. [PMID: 12734720 DOI: 10.1007/s10265-003-0099-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2003] [Accepted: 02/16/2003] [Indexed: 05/24/2023]
Abstract
Recent progress in the study of cytokinin metabolism in plants indicates that quantitative analysis of cytokinin nucleotides is essential for elucidation of early steps of the biosynthetic pathway. However, traditional procedures for purification and quantification of cytokinin cannot discriminate the various nucleotides. We describe here a method for separation and determination of cytokinin nucleotides through a series of anion-exchange column chromatography steps followed by liquid chromatography-mass spectrometry. This method enabled us to analyze the amount of each species of cytokinin nucleotide in plant tissues.
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Affiliation(s)
- Kentaro Takei
- Plant Science Center, RIKEN (The Institute of Physical and Chemical Research), 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan
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Ohkama N, Takei K, Sakakibara H, Hayashi H, Yoneyama T, Fujiwara T. Regulation of sulfur-responsive gene expression by exogenously applied cytokinins in Arabidopsis thaliana. Plant Cell Physiol 2002; 43:1493-501. [PMID: 12514246 DOI: 10.1093/pcp/pcf183] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Effects of plant hormones on a sulfur-deficiency responsive element (betaSR) from the promoter region of the beta subunit gene of beta-conglycinin, a major seed storage protein of soybean, were investigated using transgenic Arabidopsis thaliana. Among the hormones tested, the cytokinins, trans-zeatin (Z) and trans-zeatin riboside, upregulated gene expression directed by the betaSR element both in the presence and in the absence of sulfate in the medium. Z also increased transcript accumulation of two endogenous sulfur-responsive genes, the adenosine 5'-phosphosulfate reductase (APR1) and the Sultr2;2, a sulfate transporter. Concentrations of cytokinins were unaltered during early stages of sulfur starvation when expression of these genes was upregulated. Z did not alter concentrations of O-acetyl-L-serine, a positive regulator of gene expression in sulfur starvation response. Concentrations of sucrose, which is known to upregulate expression of APR1, were increased in rosette leaves by Z. Sucrose application to the medium also increased expression directed by the betaSR element, although sucrose concentrations in tissues were not significantly altered by sulfur availability. These results suggest that exogenously applied cytokinins positively regulate expression of these sulfur responsive genes through a pathway independent of that from sulfur starvation, possibly through increasing sucrose concentrations in tissues.
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Affiliation(s)
- Naoko Ohkama
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657 Japan.
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Takei K, Takahashi T, Sugiyama T, Yamaya T, Sakakibara H. Multiple routes communicating nitrogen availability from roots to shoots: a signal transduction pathway mediated by cytokinin. J Exp Bot 2002; 53:971-7. [PMID: 11912239 DOI: 10.1093/jexbot/53.370.971] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In higher plants, inorganic nitrogen has crucial effects on growth and development, providing cellular components and modulating gene expression. To date, not only nitrogen assimilatory genes but also a substantial number of genes with other functions have been shown to be selectively regulated by the availability of nitrogen. In terms of the communicating substance(s) between root and shoot, accumulating evidence suggests that nitrate itself is the primary signal molecule triggering the activation of transcription of nitrate assimilation and related genes. On the other hand, some of the genes involved in photosynthesis, cell cycling and translation machinery are also regulated, at least in part, by nitrate and other nitrogen sources and, in some cases, the effect can be mimicked by cytokinin treatment. Spatial and temporal studies on the accumulation levels and the translocation of cytokinin in response to nitrate replenishment in maize showed subsequent accumulation of various cytokinin species in the roots, xylem sap and leaves. In Arabidopsis thaliana, trans-zeatin riboside-5'-monophosphate and/or trans-zeatin riboside also accumulated in the roots in response to nitrate resupply. These studies suggest that cytokinin metabolism and translocation could be commonly modulated by nitrogen availability in higher plants. Thus, in addition to nitrate, cytokinin could be another root-to-shoot signal communicating nitrogen availability.
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Affiliation(s)
- Kentaro Takei
- Laboratory for Communication Mechanism, Plant Science Center, RIKEN (The Institute of Physical and Chemical Research) Hirosawa 2-1, Wako, Saitama 351-0198, Japan
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Sakakibara H, Takei K. Identification of Cytokinin Biosynthesis Genes in Arabidopsis: A Breakthrough for Understanding the Metabolic Pathway and the Regulation in Higher Plants. J Plant Growth Regul 2002; 21:17-23. [PMID: 11976877 DOI: 10.1007/s003440010043] [Citation(s) in RCA: 8] [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] [Received: 10/03/2001] [Accepted: 12/05/2001] [Indexed: 05/23/2023]
Abstract
The primary biosynthetic reaction of cytokinin is thought to be the isopentenylation of an adenine nucleotide such as AMP with dimethylallylpyrophosphate. For many years, the nature of the enzyme catalyzing this reaction in higher plants had not been identified despite the physiological importance of these compounds. However, the completion of the genomic sequence of Arabidopsis thaliana, a model plant for genetic research, has provided us with new opportunities to solve these problems. Recent studies have revealed the cytokinin biosynthesis enzyme is encoded by a small multigene family that is structurally related to both bacterial adenylate isopentenyltransferase and tRNA isopentenyltransferase. Interestingly, biochemical studies of some of the gene products indicate that ADP and ATP, rather than AMP, are preferentially used as substrates for this biosynthetic reaction. These findings require reconsideration of the currently accepted cytokinin biosynthetic pathway. In addition, there is an increasing body of evidence suggesting that the expression of these cytokinin synthesis genes is affected by the availability of nutrients.
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Affiliation(s)
- Hitoshi Sakakibara
- The Institute of Physical and Chemical Research (RIKEN), Plant Science Center, Wako, Saitama, Japan
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Nemoto Y, Wenk MR, Watanabe M, Daniell L, Murakami T, Ringstad N, Yamada H, Takei K, De Camilli P. Identification and characterization of a synaptojanin 2 splice isoform predominantly expressed in nerve terminals. J Biol Chem 2001; 276:41133-42. [PMID: 11498538 DOI: 10.1074/jbc.m106404200] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [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
We have previously identified synaptojanin 1, a phosphoinositide phosphatase predominantly expressed in the nervous system, and synaptojanin 2, a broadly expressed isoform. Synaptojanin 1 is concentrated in nerve terminals, where it has been implicated in synaptic vesicle recycling and actin function. Synaptojanin 2A is targeted to mitochondria via a PDZ domain-mediated interaction. We have now characterized an alternatively spliced form of synaptojanin 2 that shares several properties with synaptojanin 1. This isoform, synaptojanin 2B, undergoes further alternative splicing to generate synaptojanin 2B1 and 2B2. Both amphiphysin and endophilin, two partners synaptojanin 1, bind synaptojanin 2B2, whereas only amphiphysin binds synaptojanin 2B1. Sequence similar to the endophilin-binding site in synaptojanin 1 is present only in synaptojanin 2B2, and this sequence was capable of affinity purifying endophilin from rat brain. The Sac1 domain of synaptojanin 2 exhibited phosphoinositide phosphatase activity very similar to that of the Sac1 domain of synaptojanin 1. Site-directed mutagenesis further illustrated its functional similarity to the catalytic domain of Sac1 proteins. Antibodies raised against the synaptojanin 2B-specific carboxyl-terminal region identified a 160-kDa protein in brain and testis. Immunofluorescence showed that synaptojanin 2B is localized at nerve terminals in brain and at the spermatid manchette in testis. Active Rac1 GTPase affects the intracellular localization of synaptojanin 2, but not of synaptojanin 1. These results suggest that synaptojanin 2B has a partially overlapping function with synaptojanin 1 in nerve terminals, with additional roles in neurons and other cells including spermatids.
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Affiliation(s)
- Y Nemoto
- Neuronal Circuit Mechanisms Research Group, Brain Science Institute, Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Takei K, Sano Y, Achiron LR, Carr JD, Stulting RD, Thompson KP, Waring GO. Monocular Diplopia Related to Asymmetric Corneal Topography After Laser in situ Keratomileusis. J Refract Surg 2001; 17:652-7. [PMID: 11758983 DOI: 10.3928/1081-597x-20011101-04] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/20/2022]
Abstract
PURPOSE To show a specific relationship between monocular diplopia and corneal refractive asymmetry after laser in situ keratomileusis (LASIK). METHODS One hundred thirty-eight eyes of 98 patients who underwent LASIK for myopia between -2.12 and -17.75 D were examined under room-lighted conditions. We examined 51 eyes at 2 weeks, 46 eyes at 3 months, 32 eyes at 6 months, and 9 eyes at 1 year after LASIK. We attempted to correlate the presence of monocular diplopia with their corneal topographical features. RESULTS Eight eyes of five patients (five eyes at 2 weeks, three eyes at 3 months after LASIK) produced symptoms of monocular diplopia. These symptomatic patients had a common corneal topographical feature caused by decentralized or inhomogeneous ablation. Every pupillary area in the patients' topographies contained steeper and flatter areas. The range of refractive power variation in these asymmetric areas was at least 1.50 D. The location of the secondary image correlated with the direction of the steeper area in all eight eyes. Pinhole viewing eliminated or reduced the prominence of secondary images in every case. CONCLUSION Monocular diplopia following LASIK appears to correlate with postoperative corneal refractive power variation inside the pupillary area, caused by decentralized or inhomogeneous ablation.
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Affiliation(s)
- K Takei
- Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
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