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Watanabe J, Ohya H, Sakai J, Suwa Y, Goto K, Nakagawa K, Ozawa M, Ishibe A, Suwa H, Kunisaki C, Endo I. Long-term outcomes of indocyanine green fluorescence imaging-guided laparoscopic lateral pelvic lymph node dissection for clinical stage II/III middle-lower rectal cancer: a propensity score-matched cohort study. Tech Coloproctol 2023; 27:759-767. [PMID: 36773172 DOI: 10.1007/s10151-023-02761-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 01/25/2023] [Indexed: 02/12/2023]
Abstract
BACKGROUND We previously reported that indocyanine green fluorescence imaging (ICG-FI)-guided laparoscopic lateral pelvic lymph node dissection (LPLND) was able to increase the total number of harvested lateral pelvic lymph nodes without impairing functional preservation. However, the long-term outcomes of ICG-FI-guided laparoscopic LPLND have not been evaluated. The aim of the present study was to compare the long-term outcomes of ICG-FI-guided laparoscopic LPLND to conventional laparoscopic LPLND without ICG-FI. METHODS This was a retrospective, multi-institutional study with propensity score matching. The study population included consecutive patients with middle-low rectal cancer (clinical stage II to III) who underwent laparoscopic LPLND between January 2013 and February 2018. The main evaluation items in this study were the 3-year overall survival, relapse-free survival (RFS), local recurrence rate, and lateral local recurrence (LLR) rate. RESULTS A total of 172 patients with middle-lower rectal cancer who had undergone laparoscopic LPLND were included in this study. After propensity score matching, 58 patients were matched in each of the ICG-FI and non-ICG-FI groups. There were no substantial differences in the baseline characteristics between the two groups. The ICG-FI group and non-ICG-FI group included 40 and 38 women and had a median age of 65 (IQR 60-72) and 66 (IQR 60-73) years, respectively. The median follow-up for all patients was 63.7 (IQR 51.3-76.8) months. The estimated respective 3-year overall survival, RFS, and local recurrence rates were 93.1%, 70.7%, and 5.2% in the ICG-FI group and 85.9%, 71.7%, and 12.8% in the non-ICG-FI group (p = 0.201, 0.653, 0.391). The 3-year cumulative LLR rate was 0% in the ICG-FI group and 9.3% in the non-ICG-FI group (p = 0.048). CONCLUSIONS This study revealed that laparoscopic LPLND combined with ICG-FI was able to decrease the LLR rate. It appears that ICG-FI could contribute to improving the quality of laparoscopic LPLND and strengthening local control of the lateral pelvis. TRIALS REGISTRATION This study was registered with the Japanese Clinical Trials Registry as UMIN000041372 ( http://www.umin.ac.jp/ctr/index.htm ).
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Affiliation(s)
- J Watanabe
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, Yokohama, 232-0024, Japan.
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
| | - H Ohya
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - J Sakai
- Department of Surgery, Yokosuka Kyosai Hospital, Yokosuka, Japan
| | - Y Suwa
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, Yokohama, 232-0024, Japan
| | - K Goto
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, Yokohama, 232-0024, Japan
| | - K Nakagawa
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - M Ozawa
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - A Ishibe
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - H Suwa
- Department of Surgery, Yokosuka Kyosai Hospital, Yokosuka, Japan
| | - C Kunisaki
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, Yokohama, 232-0024, Japan
| | - I Endo
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Ohya H, Watanabe J, Chida K, Goto K, Suwa Y, Nakagawa K, Suwa H, Ozawa M, Ishibe A, Endo I. Initial experience with the transanal approach for lateral pelvic lymph node dissection in rectal cancer. Tech Coloproctol 2023; 27:685-691. [PMID: 36757559 DOI: 10.1007/s10151-023-02763-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 01/25/2023] [Indexed: 02/10/2023]
Abstract
BACKGROUND The efficacy and safety of transanal lateral pelvic lymph node dissection (TaLPLND) in rectal cancer has not yet been clarified. The aim of the present study was to evaluate the short-term results as an initial experience of TaLPLND. METHODS This retrospective study included patients with middle to lower rectal cancer who underwent TaLPLND from July 2018 to July 2021. Our institutions targeted lymph nodes in the internal iliac area and the obturator area for lateral pelvic lymph node dissection (LPLND). RESULTS A total of 30 consecutive patients with rectal cancer were included in this analysis. The median age was 60 years (range, 36-83 years), and the male-female ratio was 2:1. The median operative time was 362 min (IQR, 283-661 min), and the median intraoperative blood loss was 74 ml (IQR, 5-500 ml). Intraoperative blood transfusion was required in one case. No cases required conversion to laparotomy. TaLPLND was performed bilaterally in 13 patients (43.3%). Five patients (16.7%) underwent LPLND with combined resection of the internal iliac vessels. The median distance of the distal margin from the anal verge was 20 mm. The pathological radial margin (pRM) was positive in one case, and the negative pRM rate was 96.7%. Short-term postoperative complications (Clavien-Dindo classification grade ≥ II) were observed in nine cases (30.0%). There were no cases of reoperation or mortality. The median number of harvested lateral pelvic lymph nodes was 11 (range, 3-28). On pathological examination, lateral pelvic lymph nodes were positive for metastasis in seven cases (23.3%). CONCLUSIONS TaLPLND appeared to be beneficial from an oncological point of view because it was close to the upstream lymphatic drainage from the tumor. The short-term outcomes of this initial experience indicate that this novel approach is feasible.
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Affiliation(s)
- H Ohya
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Kanazawa-Ku, Yokohama, Japan
| | - J Watanabe
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, YokohamaYokohama, 232-0024, Japan.
| | - K Chida
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, YokohamaYokohama, 232-0024, Japan
| | - K Goto
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, YokohamaYokohama, 232-0024, Japan
| | - Y Suwa
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, 4-57, Urafune-Cho, Minami-Ku, YokohamaYokohama, 232-0024, Japan
| | - K Nakagawa
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Kanazawa-Ku, Yokohama, Japan
| | - H Suwa
- Department of Surgery, Yokosuka Kyosai Hospital, Yokosuka, Japan
| | - M Ozawa
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Kanazawa-Ku, Yokohama, Japan
| | - A Ishibe
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Kanazawa-Ku, Yokohama, Japan
| | - I Endo
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Kanazawa-Ku, Yokohama, Japan
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Yamazaki K, Satake H, Takashima A, Mizusawa J, Kataoka T, Fukuda H, Ishizuka Y, Suwa Y, Numata K, Shibata N, Asayama M, Yokota M, Tsushima T, Ohta T, Yamaguchi T, Hamaguchi T, Kanemitsu Y. 446TiP Randomized phase III study of bi-weekly trifluridine/tipiracil (FTD/TPI) plus bevacizumab (BEV) vs. FTD/TPI for chemorefractory metastatic colorectal cancer (mCRC): ROBiTS/JCOG2014. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Taniguchi N, Miyasaka Y, Suwa Y, Harada S, Nakai E, Shiojima I. External validation of H2ARDD score for the prediction of heart failure events in patients with atrial fibrillation. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0480] [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: 11/14/2022] Open
Abstract
Abstract
Background
Heart failure is an important consequence in patients with atrial fibrillation (AF) which is associated with worse prognosis. The H2ARDD score, calculated from 5 clinical risk factors, was reported as a predictor of heart failure events in patients with AF. However, this score has not been externally validated.
Purpose
The purpose of this study was to evaluate and validate the usefulness of the H2ARDD score for the prediction of heart failure events in AF patients.
Methods
We used prospective data of patients with AF followed up from 2007 to 2017 in our institute. Patients with active cancer were excluded according to the previous report. H2ARDD score was calculated as follows; history of heart disease=2 points, anemia=1 point, renal dysfunction=1 point, diabetes =1 point, diuretic use=1 point (range from 0 to 6 points). Outcome of interest was defined as heart failure events including new-onset heart failure and death with heart failure. Heart failure was ascertained based on the Framingham criteria. Univariable and multivariable Cox-proportional hazards model were used to assess the risk of heart failure events. Heart failure events-free survival was estimated with Kaplan-Meier methods, and the predictive accuracy of the H2ARDD score for the prediction of heart failure events was measured by the area under the receiver operating characteristic (ROC) curve.
Results
Of 562 AF patients, 522 (age 69±10 year–old, 64.9%men) met study criteria. Patients who had a history of heart disease was 185 (35%), diabetes mellitus was 135 (26%), anemia was 54 (10%), renal dysfunction was 221 (43%), and diuretic use was 193 (37%). The mean H2ARDD score was 1.88±1.57. Of all study patients, 84 (16.2%) developed heart failure events during a mean follow–up of 54±42 months. Patients who developed heart failure events in 1 year was 24 (4.6%). In multivariable Cox–proportional hazards model, H2ARDD score was shown as an significant predictor for heart failure events (hazard ratio: 1.56, 95% confidence interval: 1.36 - 1.79, P<0.0001), independently of age (per 10 years, hazard ratio: 1.35, 95% confidence interval: 1.03 – 1.78, P<0.05). In the Kaplan–Meier analyses stratified by H2ARDD score (0–1, 2–3, 4–6), patients who had a higher H2ARDD sore had significantly worse heart failure event-free survival (log-rank P<0.0001) (Figure 1). The area under the ROC curve for the prediction of heart failure events in 1-year was 0.812 (95% confidence interval: 0.737 – 0.887, P<0.0001), and the best cut-off value was ≥4 points (sensitivity: 67%, specificity: 83%) (Figure 2).
Conclusion
H2ARDD score was demonstrated as a significant independent predictor for the prediction of heart failure events, with high predictive accuracy. H2ARDD score may be useful for heart failure risk stratification of AF patients.
Funding Acknowledgement
Type of funding sources: None. Figure 1Figure 2
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Affiliation(s)
| | | | - Y Suwa
- Kansai Medical University, Osaka, Japan
| | - S Harada
- Kansai Medical University, Osaka, Japan
| | - E Nakai
- Kansai Medical University, Osaka, Japan
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Kobashigawa Y, Ohara T, Morita K, Toyota Y, Nakamura T, Kotani S, Arimori T, Yamauchi S, Liu C, Kitazaki M, Wakeyama-Miyazaki Y, Suwa Y, Uchida-Kamekura M, Fukuda N, Sato T, Nakajima M, Takagi J, Yamagata Y, Morioka H. Molecular recognition of a single-chain Fv antibody specific for GA-pyridine, an advanced glycation end-product (AGE), elucidated using biophysical techniques and synthetic antigen analogues. J Biochem 2021; 170:379-387. [PMID: 34185078 DOI: 10.1093/jb/mvab056] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/22/2021] [Indexed: 11/13/2022] Open
Abstract
Advanced glycation end-products (AGEs) are a heterogeneous group of compounds formed by non-enzymatic reaction between reducing-sugar and Arg/Lys in proteins, and are involved in various diabetic complications. GA-pyridine is derived from glycolaldehyde and is one of the most cytotoxic AGEs. Here, we established a single-chain Fv (scFv) antibody against GA-pyridine, 73MuL9-scFv, and examined the details of its specificity and antigen recognition by using various techniques involving biophysics, chemical biology and structural biology. We also synthesized several compounds that differ slightly in regard to the position and number of GA-pyridine substituent groups, and revealed that GA-pyridine was specifically bound to 73MuL9-scFv. Thermodynamic analysis revealed that the association of GA-pyridine to 73MuL9-scFv was an exothermic and enthalpy driven reaction, and thus that the antigen recognition involved multiple specific interactions. Crystallographic analysis of the Fv fragment of 73MuL9-scFv revealed that several CH-π and hydrogen bond interactions took place between the Fv-fragment and GA-pyridine, which was consistent with the results of thermodynamic analysis. Further studies using 73MuL9-scFv as a tool to clarify the relevance of GA-pyridine to diabetic complications are warranted.
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Affiliation(s)
- Yoshihiro Kobashigawa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Toshiya Ohara
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Kosuke Morita
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Yuya Toyota
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Teruya Nakamura
- Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan.,Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan
| | - Shunsuke Kotani
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Takao Arimori
- Laboratory of Protein Synthesis and Expression, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Soichiro Yamauchi
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Chenjiang Liu
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Masaya Kitazaki
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Yukari Wakeyama-Miyazaki
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Yoshiaki Suwa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Makiyo Uchida-Kamekura
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Natsuki Fukuda
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Takashi Sato
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Makoto Nakajima
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Junichi Takagi
- Laboratory of Protein Synthesis and Expression, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yuriko Yamagata
- Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Hiroshi Morioka
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
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Watanabe J, Ishibe A, Takei S, Suwa Y, Suwa H, Endo I. A new intracorporeal suture-less stapled end-to-end anastomosis in laparoscopic left-colectomy for colon cancer - a video vignette. Colorectal Dis 2020; 22:1803-1804. [PMID: 32620045 DOI: 10.1111/codi.15232] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 06/15/2020] [Indexed: 02/08/2023]
Affiliation(s)
- J Watanabe
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan
| | - A Ishibe
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - S Takei
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan
| | - Y Suwa
- Department of Surgery, Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan
| | - H Suwa
- Department of Surgery, Yokosuka Kyosai Hospital, Yokosuka, Japan
| | - I Endo
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Miyasaka Y, Taniguchi N, Suwa Y, Nakai E, Harada S, Shiojima I. Usefulness of H2FPEF score as an independent predictor of heart failure development in patients with atrial fibrillation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
The H2 FPEF score, which based on simple clinical characteristics and echocardiography, enables discrimination of HFpEF from noncardiac causes of dyspnea.
Purpose
We sought to evaluate whether H2 FPEF score predicts congestive heart failure (CHF) development in patients with atrial fibrillation (AF).
Methods
Among adult AF patients who underwent transthoracic echocardiography between July 2007 and December 2008, those with preserved left ventricular ejection fraction (LVEF) (≥50%) were included and followed up to new-onset CHF events. Patients with a history of CHF, cardiac surgery, or significant left-sided valvular heart disease were excluded. The H2 FPEF score was calculated from 6 variables (obesity = 2 points, treatment with ≥2 antihypertensive drugs = 1 point, AF = 3 points, echocardiographic pulmonary artery systolic pressure >35 mmHg = 1 point, age >60 years = 1 point, and echocardiographic E/e'ratio >9 = 1 point). CHF was ascertained using Framingham criteria. Cox-proportional hazards modeling was used to assess risk of CHF development.
Results
Of 562 AF patients, 367 (69±10 year old, 66% men) met all study criteria. Of whom, 37 (10%) developed CHF events during a mean follow–up of 56±43 months. The mean H2 FPEF score was 5.50±1.14, and the number of patients with H2 FPEF score ≥7 was 64 (17%). After adjusting for comorbidities in a multivariate model, H2 FPEF score was significant predictor of new-onset CHF events both as continuous (HR=1.43, 95% CI: 1.05–1.96, P<0.05) or categorical (H2 FPEF score ≥7) (HR=2.32, 95% CI: 1.17–4.63, P<0.05) variables. The Kaplan-Meier estimates of CHF-free survival stratified by H2 FPEF status (≥7 or <7) were shown in Figure.
Conclusion
H2 FPEF score provides prognostic information for new-onset CHF development in patients with AF.
Figure 1
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Miyasaka
- Kansai Medical University, Department of Medicine II, Osaka, Japan
| | - N Taniguchi
- Kansai Medical University, Department of Medicine II, Osaka, Japan
| | - Y Suwa
- Kansai Medical University, Department of Medicine II, Osaka, Japan
| | - E Nakai
- Kansai Medical University, Department of Medicine II, Osaka, Japan
| | - S Harada
- Kansai Medical University, Department of Medicine II, Osaka, Japan
| | - I Shiojima
- Kansai Medical University, Department of Medicine II, Osaka, Japan
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Suwa Y, Joshi M, Poynter L, Endo I, Ashrafian H, Darzi A. Obese patients and robotic colorectal surgery: systematic review and meta-analysis. BJS Open 2020; 4:1042-1053. [PMID: 32955800 PMCID: PMC7709366 DOI: 10.1002/bjs5.50335] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 07/05/2020] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Obesity is a major health problem, demonstrated to double the risk of colorectal cancer. The benefits of robotic colorectal surgery in obese patients remain largely unknown. This meta-analysis evaluated the clinical and pathological outcomes of robotic colorectal surgery in obese and non-obese patients. METHODS MEDLINE, Embase, Global Health, Healthcare Management Information Consortium (HMIC) and Midwives Information and Resources Service (MIDIRS) databases were searched on 1 August 2018 with no language restriction. Meta-analysis was performed according to PRISMA guidelines. Obese patients (BMI 30 kg/m2 or above) undergoing robotic colorectal cancer resections were compared with non-obese patients. Included outcome measures were: operative outcomes (duration of surgery, conversion to laparotomy, blood loss), postoperative complications, hospital length of stay and pathological outcomes (number of retrieved lymph nodes, positive circumferential resection margins and length of distal margin in rectal surgery). RESULTS A total of 131 full-text articles were reviewed, of which 12 met the inclusion criteria and were included in the final analysis. There were 3166 non-obese and 1420 obese patients. A longer duration of surgery was documented in obese compared with non-obese patients (weighted mean difference -21·99 (95 per cent c.i. -31·52 to -12·46) min; P < 0·001). Obese patients had a higher rate of conversion to laparotomy than non-obese patients (odds ratio 1·99, 95 per cent c.i. 1·54 to 2·56; P < 0·001). Blood loss, postoperative complications, length of hospital stay and pathological outcomes were not significantly different in obese and non-obese patients. CONCLUSION Robotic surgery in obese patients results in a significantly longer duration of surgery and higher conversion rates than in non-obese patients. Further studies should focus on better stratification of the obese population with colorectal disease as candidates for robotic procedures.
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Affiliation(s)
- Y. Suwa
- Department of Surgery and CancerImperial College LondonLondonUK
- Department of Gastroenterological SurgeryYokohama City UniversityYokohamaJapan
| | - M. Joshi
- Department of Surgery and CancerImperial College LondonLondonUK
| | - L. Poynter
- Department of Surgery and CancerImperial College LondonLondonUK
| | - I. Endo
- Department of Gastroenterological SurgeryYokohama City UniversityYokohamaJapan
| | - H. Ashrafian
- Department of Surgery and CancerImperial College LondonLondonUK
| | - A. Darzi
- Department of Surgery and CancerImperial College LondonLondonUK
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Yamamoto M, Suwa Y, Sugiyama K, Okashita N, Kawaguchi M, Tani N, Matsubara K, Nakamura A, Seki Y. The PRDM14-CtBP1/2-PRC2 complex regulates transcriptional repression during the transition from primed to naïve pluripotency. J Cell Sci 2020; 133:jcs240176. [PMID: 32661086 DOI: 10.1242/jcs.240176] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 06/25/2020] [Indexed: 12/17/2022] Open
Abstract
The pluripotency-associated transcriptional network is regulated by a core circuitry of transcription factors. The PR domain-containing protein PRDM14 maintains pluripotency by activating and repressing transcription in a target gene-dependent manner. However, the mechanisms underlying dichotomic switching of PRDM14-mediated transcriptional control remain elusive. Here, we identified C-terminal binding protein 1 and 2 (CtBP1 and CtBP2; generically referred to as CtBP1/2) as components of the PRDM14-mediated repressive complex. CtBP1/2 binding to PRDM14 depends on CBFA2T2, a core component of the PRDM14 complex. The loss of Ctbp1/2 impaired the PRDM14-mediated transcriptional repression required for pluripotency maintenance and transition from primed to naïve pluripotency. Furthermore, CtBP1/2 interacted with the PRC2 complexes, and the loss of Ctbp1/2 impaired Polycomb repressive complex 2 (PRC2) and H3K27me3 enrichment at target genes after Prdm14 induction. These results provide evidence that the target gene-dependent transcriptional activity of PRDM14 is regulated by partner switching to ensure the transition from primed to naïve pluripotency.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Maiko Yamamoto
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Yoshiaki Suwa
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Kohta Sugiyama
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Naoki Okashita
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Masanori Kawaguchi
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Naoki Tani
- Liaison Laboratory Research Promotion Center, Institute of Molecular Embryology and Genetics, Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan
| | - Kazumi Matsubara
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Akira Nakamura
- Department of Germline Development, Institute of Molecular Embryology and Genetics, Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan
| | - Yoshiyuki Seki
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
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10
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Ishima Y, Mimono A, Tuan Giam Chuang V, Fukuda T, Kusumoto K, Okuhira K, Suwa Y, Watanabe H, Ishida T, Morioka H, Maruyama T, Otagiri M. Albumin domain mutants with enhanced Aβ binding capacity identified by phage display analysis for application in various peripheral Aβ elimination approaches of Alzheimer's disease treatment. IUBMB Life 2019; 72:641-651. [PMID: 31794135 DOI: 10.1002/iub.2203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 11/03/2019] [Indexed: 11/11/2022]
Abstract
Deposition of amyloid protein, particularly Aβ1-42 , is a major contributor to the onset of Alzheimer's disease (AD). However, almost no deposition of Aβ in the peripheral tissues could be found. Human serum albumin (HSA), the most abundant protein in the blood, has been reported to inhibit amyloid formation through binding Aβ, which is believed to play an important role in the peripheral clearance of Aβ. We identified the Aβ binding site on HSA and developed HSA mutants with high binding capacities for Aβ using a phage display method. HSA fragment 187-385 (Domain II) was found to exhibit the highest binding capacity for Aβ compared with the other two HSA fragments. To elucidate the sequence that forms the binding site for Aβ on Domain II, a random screening of Domain II display phage biopanning was constructed. A number of mutants with higher Aβ binding capacities than the wild type were identified. These mutants exhibited stronger scavenging abilities than the wild type, as revealed via in vitro equilibrium dialysis of Aβ experiments. These findings provide useful basic data for developing a safer alternative therapy than Aβ vaccines and for application in plasma exchange as well as extracorporeal dialysis.
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Affiliation(s)
- Yu Ishima
- Department of Pharmacokinetics and Biopharmaceutics, Institute of Biomedical Sciences, Tokushima University, Tokushima, Japan.,School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Subang Jaya, Selangor, Malaysia
| | - Ai Mimono
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Oe-honmachi, Kumamoto, Japan
| | - Victor Tuan Giam Chuang
- School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Subang Jaya, Selangor, Malaysia
| | - Tetsuya Fukuda
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Oe-honmachi, Kumamoto, Japan
| | - Kohshi Kusumoto
- Department of Pharmacokinetics and Biopharmaceutics, Institute of Biomedical Sciences, Tokushima University, Tokushima, Japan
| | - Keiichiro Okuhira
- Department of Pharmacokinetics and Biopharmaceutics, Institute of Biomedical Sciences, Tokushima University, Tokushima, Japan
| | - Yoshiaki Suwa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Hiroshi Watanabe
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Oe-honmachi, Kumamoto, Japan
| | - Tatsuhiro Ishida
- Department of Pharmacokinetics and Biopharmaceutics, Institute of Biomedical Sciences, Tokushima University, Tokushima, Japan
| | - Hiroshi Morioka
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Toru Maruyama
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Oe-honmachi, Kumamoto, Japan
| | - Masaki Otagiri
- Faculty of Pharmaceutical Sciences, Sojo University, Ikeda, Kumamoto, Japan.,DDS Research Institute, Sojo University, Ikeda, Kumamoto, Japan
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11
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Suwa Y, Miyasaka Y, Taniguchi N, Harada S, Shiojima I. P303Prognostic value of diastolic wall strain in patients with asymptomatic severe aortic stenosis. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0138] [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: 11/13/2022] Open
Abstract
Abstract
Background
Diastolic wall strain (DWS) has been reported to be associated with left ventricular (LV) stiffness and worse clinical outcomes. We sought to assess the utility of this new index for prediction of prognosis in asymptomatic patients with severe aortic stenosis (AS).
Methods
Asymptomatic severe AS patients [peak flow velocity (PFV) ≥4.0m/s, mean pressure gradient (mPG) ≥40mmHg, aortic valve area (AVA) ≤1.0cm2, or indexed AVA ≤0.6cm2/m2)] diagnosed between July 2007 and April 2016 were included in this study. Patients with significant mitral valve disease, posterior wall motion abnormality, prior cardiac surgery, hypertrophic cardiomyopathy, and LV ejection fraction <50% were excluded. DWS was calculated with a validated formula [DWS = (posterior wall thickness at end-systole − posterior wall thickness at end-diastole)/posterior wall thickness at end-systole]. All study patients were prospectively followed up to last visit or death until November 2017, and predictive value of all-cause death was assessed using Cox-proportional hazards modeling. Patients who underwent aortic valve replacement (AVR) during the study period were censored on the date of surgery.
Results
A total of 184 asymptomatic severe AS, 138 (age 76±9year-old, men 41%, PFV 3.9±1.0m/s, mPG 38±19mmHg, AVA 0.83±0.18cm2, indexed AVA 0.56±0.13cm2/m2) met all study criteria. Of whom, 43 (31%) underwent AVR and 28 (20%) died during a mean follow-up of 25±28months. In a multivariable model after adjusting for clinical and echocardiographic variables, advancing age (per10yrs; HR=2.19, 95% CI=1.19–4.03, P<0.05), history of hemodialysis (HR=4.31, 95% CI=1.30–14.35, P<0.05), and low-DWS (DWS <0.30) (HR=2.83, 95% CI=1.25–6.40, P<0.05) were independent predictors of all-cause death. In the Kaplan-Meier estimates of cumulative survival stratified by DWS status were shown (Figure).
The Kaplan-Meier estimates of survival
Conclusion
Low-DWS provides prognostic information in patients with asymptomatic severe AS.
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Affiliation(s)
- Y Suwa
- Kansai Medical University, Osaka, Japan
| | | | | | - S Harada
- Kansai Medical University, Osaka, Japan
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12
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Kawaguchi M, Sugiyama K, Matsubara K, Lin CY, Kuraku S, Hashimoto S, Suwa Y, Yong LW, Takino K, Higashida S, Kawamura D, Yu JK, Seki Y. Co-option of the PRDM14–CBFA2T complex from motor neurons to pluripotent cells during vertebrate evolution. Development 2019; 146:dev.168633. [DOI: 10.1242/dev.168633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 12/20/2018] [Indexed: 11/20/2022]
Abstract
Gene regulatory networks underlying cellular pluripotency are controlled by a core circuitry of transcription factors in mammals, including POU5F1. However, the evolutionary origin and transformation of pluripotency-related transcriptional networks have not been elucidated in deuterostomes. PR domain-containing protein 14 (PRDM14) is specifically expressed in pluripotent cells and germ cells, and required for establishing embryonic stem cells (ESCs) and primordial germ cells in mice. Here, we compared the functions and expression patterns of PRDM14 orthologues within deuterostomes. Amphioxus PRDM14 and zebrafish PRDM14, but not sea urchin PRDM14, compensated for mouse PRDM14 function in maintaining mouse ESC pluripotency. Interestingly, sea urchin PRDM14 together with sea urchin CBFA2T, an essential partner of PRDM14 in mouse ESCs, complemented the self-renewal defect in mouse Prdm14 KO ESCs. Contrary to the Prdm14-expression pattern in mouse embryos, Prdm14 was expressed in motor neurons of amphioxus embryos as observed in zebrafish embryos. Thus, Prdm14 expression in motor neurons was conserved in non-tetrapod deuterostomes and the co-option of the PRDM14-CBFA2T complex from motor neurons into pluripotent cells may have maintained the transcriptional network for pluripotency during vertebrate evolution.
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Affiliation(s)
- Masanori Kawaguchi
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Kota Sugiyama
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Kazumi Matsubara
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Che-Yi Lin
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Shigehiro Kuraku
- Laboratory for Phyloinformatics, RIKEN Center for Biosystems Dynamics Research, 2-2-3 Minatojima-minami, Kobe, 650-0047, Japan
| | - Shota Hashimoto
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Yoshiaki Suwa
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Luok Wen Yong
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Koji Takino
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Shota Higashida
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Daisuke Kawamura
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
| | - Jr-Kai Yu
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Yoshiyuki Seki
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin Univerisity, Japan
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13
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Abe Y, Yokozawa S, Umemiya-Shirafuji R, Moumouni P, Suwa Y, Suzuki H. Fertilizing ability of canine spermatozoa cryopreserved with skim milk-based extender in a retrospective study. Reprod Domest Anim 2017; 53:237-242. [PMID: 29110350 DOI: 10.1111/rda.13098] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 09/19/2017] [Indexed: 12/18/2022]
Abstract
We previously reported that skim milk (SM) is an effective cryoprotectant for cryopreservation of canine spermatozoa instead of egg yolk (EY), which is the conventional cryoprotectant. In this study, the fertilizing ability and practical use of frozen canine spermatozoa prepared with SM were evaluated by transcervical insemination. Frozen-thawed spermatozoa were inseminated one to four times on days 2-9 after the LH surge. In SM group, a single transcervical insemination (TCI) on Day 5 led to higher delivery rate (83%) than any other days (33%-50%) post-LH surge. In EY group, delivery rate in double TCI on days 5 and 6 (71%) was higher compared to any other experimental groups (0%-44%). Regardless of single or double, TCI on Day 5 or Day 6 led to higher litter sizes in SM or EY groups, respectively. The breeding efficiency and litter size of single TCI on Day 5 (4.2) and double TCI on Day 5 and Day 6 (3.7) were significantly higher than in the other experimental groups in SM and EY groups, respectively (p < .05). These findings suggest that skim milk is a suitable alternative to egg yolk for cryopreservation of canine spermatozoa, and the suitable timing for insemination might be on Day 5 post-LH surge.
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Affiliation(s)
- Y Abe
- Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
| | - S Yokozawa
- Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
| | - R Umemiya-Shirafuji
- Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.,Global Agro-Medicine Research Center, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
| | - Pfa Moumouni
- Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
| | - Y Suwa
- Hokkaido Guide Dog Association, Sapporo, Japan
| | - H Suzuki
- Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.,Global Agro-Medicine Research Center, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.,Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
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14
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Fukuda N, Noi K, Weng L, Kobashigawa Y, Miyazaki H, Wakeyama Y, Takaki M, Nakahara Y, Tatsuno Y, Uchida-Kamekura M, Suwa Y, Sato T, Ichikawa-Tomikawa N, Nomizu M, Fujiwara Y, Ohsaka F, Saitoh T, Maenaka K, Kumeta H, Shinya S, Kojima C, Ogura T, Morioka H. Production of Single-Chain Fv Antibodies Specific for GA-Pyridine, an Advanced Glycation End-Product (AGE), with Reduced Inter-Domain Motion. Molecules 2017; 22:molecules22101695. [PMID: 28994732 PMCID: PMC6151396 DOI: 10.3390/molecules22101695] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 10/08/2017] [Accepted: 10/09/2017] [Indexed: 01/12/2023] Open
Abstract
Due to their lower production cost compared with monoclonal antibodies, single-chain variable fragments (scFvs) have potential for use in several applications, such as for diagnosis and treatment of a range of diseases, and as sensor elements. However, the usefulness of scFvs is limited by inhomogeneity through the formation of dimers, trimers, and larger oligomers. The scFv protein is assumed to be in equilibrium between the closed and open states formed by assembly or disassembly of VH and VL domains. Therefore, the production of an scFv with equilibrium biased to the closed state would be critical to overcome the problem in inhomogeneity of scFv for industrial or therapeutic applications. In this study, we obtained scFv clones stable against GA-pyridine, an advanced glycation end-product (AGE), by using a combination of a phage display system and random mutagenesis. Executing the bio-panning at 37 °C markedly improved the stability of scFvs. We further evaluated the radius of gyration by small-angle X-ray scattering (SAXS), obtained compact clones, and also visualized open.
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Affiliation(s)
- Natsuki Fukuda
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Kentaro Noi
- Department of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan.
- CREST, JST, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan.
| | - Lidong Weng
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Yoshihiro Kobashigawa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Hiromi Miyazaki
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Yukari Wakeyama
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Michiyo Takaki
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Yusuke Nakahara
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Yuka Tatsuno
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Makiyo Uchida-Kamekura
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
- Graduate School of Environmental Earth Science, Hokkaido University, Kita-10 Nishi-5, Kita-ku, Sapporo 060-0810, Japan.
| | - Yoshiaki Suwa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Takashi Sato
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Naoki Ichikawa-Tomikawa
- Graduate School of Environmental Earth Science, Hokkaido University, Kita-10 Nishi-5, Kita-ku, Sapporo 060-0810, Japan.
| | - Motoyoshi Nomizu
- Graduate School of Environmental Earth Science, Hokkaido University, Kita-10 Nishi-5, Kita-ku, Sapporo 060-0810, Japan.
| | - Yukio Fujiwara
- Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto 860-8556, Japan.
| | - Fumina Ohsaka
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan.
| | - Takashi Saitoh
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan.
| | - Katsumi Maenaka
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan.
| | - Hiroyuki Kumeta
- Global Station of Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Kita-15 Nishi-8, Kita-ku, Sapporo 060-0815, Japan.
| | - Shoko Shinya
- Laboratory of Molecular Biophysics, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
| | - Chojiro Kojima
- Laboratory of Molecular Biophysics, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
- Division of Materials Science and Chemical Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Teru Ogura
- Department of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan.
- CREST, JST, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan.
| | - Hiroshi Morioka
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
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15
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Fukuda N, Suwa Y, Uchida M, Kobashigawa Y, Yokoyama H, Morioka H. Role of the mobility of antigen binding site in high affinity antibody elucidated by surface plasmon resonance. J Biochem 2016; 161:37-43. [PMID: 27507818 DOI: 10.1093/jb/mvw050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 07/20/2016] [Indexed: 11/12/2022] Open
Abstract
Antibody is known to exhibit conformational change in the antigen recognition site after forming the initial complex. This structural change, which is widely known as "induced fit", is believed to be critical for high affinity (Kd of nM range) of antigen-antibody interaction. Elucidation of this 'induced fit' process is essential for rational design of high affinity antibody, while it is prevented by limitation of the available biophysical and biochemical data of the initial complex. Here, we performed kinetic and thermodynamic analysis of the interaction between single-chain variable fragment (denoted as scFv) of 64M5 antibody and a (6-4) photoproduct by using surface plasmon resonance (denoted as SPR). It revealed that the 64M5scFv associates the (6-4) photoproduct at initial step by hydrophobic interactions, and enthalpy-driving interactions, hydrogen bonds and van der Waals interactions, were formed by second step structural rearrangement. Furthermore, mutational analysis revealed that the mobility of the antigen-binding site is critical for the second step. It could be assumed that optimization of the mobility of the antigen recognition site is a clue for rational design of high affinity antibody.
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Affiliation(s)
- Natsuki Fukuda
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Yoshiaki Suwa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Makiyo Uchida
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Yoshihiro Kobashigawa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Hideshi Yokoyama
- Labratory of Physical Biochemistry, Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Hiroshi Morioka
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
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16
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Baranovskiy AG, Babayeva ND, Zhang Y, Gu J, Suwa Y, Pavlov YI, Tahirov TH. Mechanism of Concerted RNA-DNA Primer Synthesis by the Human Primosome. J Biol Chem 2016; 291:10006-20. [PMID: 26975377 DOI: 10.1074/jbc.m116.717405] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [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: 01/26/2016] [Indexed: 12/31/2022] Open
Abstract
The human primosome, a 340-kilodalton complex of primase and DNA polymerase α (Polα), synthesizes chimeric RNA-DNA primers to be extended by replicative DNA polymerases δ and ϵ. The intricate mechanism of concerted primer synthesis by two catalytic centers was an enigma for over three decades. Here we report the crystal structures of two key complexes, the human primosome and the C-terminal domain of the primase large subunit (p58C) with bound DNA/RNA duplex. These structures, along with analysis of primase/polymerase activities, provide a plausible mechanism for all transactions of the primosome including initiation, elongation, accurate counting of RNA primer length, primer transfer to Polα, and concerted autoregulation of alternate activation/inhibition of the catalytic centers. Our findings reveal a central role of p58C in the coordinated actions of two catalytic domains in the primosome and ultimately could impact the design of anticancer drugs.
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Affiliation(s)
- Andrey G Baranovskiy
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and
| | - Nigar D Babayeva
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and
| | - Yinbo Zhang
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and the Departments of Biochemistry and Molecular Biology and
| | - Jianyou Gu
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and
| | - Yoshiaki Suwa
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and
| | - Youri I Pavlov
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and the Departments of Biochemistry and Molecular Biology and Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Tahir H Tahirov
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center and
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17
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Maruta Y, Kuwata T, Tanaka K, Alam M, Valdez KPR, Egami Y, Suwa Y, Morioka H, Matsushita S. Cross-Neutralization Activity of Single-Chain Variable Fragment (scFv) Derived from Anti-V3 Monoclonal Antibodies Mediated by Post-Attachment Binding. Jpn J Infect Dis 2016; 69:395-404. [PMID: 26902223 DOI: 10.7883/yoken.jjid.2015.667] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The V3 loop in the envelope (Env) of HIV-1 is one of the major targets of neutralizing antibodies. However, this antigen is hidden inside the Env trimer in most isolates and is fully exposed only during CD4-gp120 interaction. Thus, primary HIV-1 isolates are relatively resistant to anti-V3 antibodies because IgG is too large to access the V3 loop. To overcome this obstacle, we constructed single-chain variable fragments (scFvs) from anti-V3 monoclonal antibodies 0.5γ, 5G2, and 16G6. Enhanced neutralization by 0.5γ and 5G2 scFvs was observed in strains resistant to their IgG counterparts. Neutralization coverage by 0.5γ scFv reached up to 90% of the tested viruses (tier 2 and 3 classes). The temperature-regulated neutralization assay revealed that extensive cross-neutralization of 0.5γ scFv can be explained by post-attachment neutralization. Neutralization assay involving viruses carrying an inter-subunit disulfide bond (SOS virus) showed that the neutralization-susceptible timeframe after attachment was 60 to 120 min. These results indicate that the scFvs efficiently access the V3 loop and subsequently neutralize HIV-1, even after virus attachment to the target cells. Based on its broad and potent neutralizing activity, further development of anti-V3 scFv for therapeutic and preventive strategies is warranted.
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Affiliation(s)
- Yasuhiro Maruta
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University
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18
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Baranovskiy AG, Zhang Y, Suwa Y, Gu J, Babayeva ND, Pavlov YI, Tahirov TH. Insight into the Human DNA Primase Interaction with Template-Primer. J Biol Chem 2015; 291:4793-802. [PMID: 26710848 DOI: 10.1074/jbc.m115.704064] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Indexed: 12/18/2022] Open
Abstract
DNA replication in almost all organisms depends on the activity of DNA primase, a DNA-dependent RNA polymerase that synthesizes short RNA primers of defined size for DNA polymerases. Eukaryotic and archaeal primases are heterodimers consisting of small catalytic and large accessory subunits, both of which are necessary for the activity. The mode of interaction of primase subunits with substrates during the various steps of primer synthesis that results in the counting of primer length is not clear. Here we show that the C-terminal domain of the large subunit (p58C) plays a major role in template-primer binding and also defines the elements of the DNA template and the RNA primer that interact with p58C. The specific mode of interaction with a template-primer involving the terminal 5'-triphosphate of RNA and the 3'-overhang of DNA results in a stable complex between p58C and the DNA/RNA duplex. Our results explain how p58C participates in RNA synthesis and primer length counting and also indicate that the binding site for initiating NTP is located on p58C. These findings provide notable insight into the mechanism of primase function and are applicable for DNA primases from other species.
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Affiliation(s)
- Andrey G Baranovskiy
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center
| | - Yinbo Zhang
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, Department of Biochemistry and Molecular Biology, and
| | - Yoshiaki Suwa
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center
| | - Jianyou Gu
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center
| | - Nigar D Babayeva
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center
| | - Youri I Pavlov
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, Department of Biochemistry and Molecular Biology, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Tahir H Tahirov
- From the Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center,
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Okashita N, Sakashita N, Ito K, Mitsuya A, Suwa Y, Seki Y. PRDM14 maintains pluripotency of embryonic stem cells through TET-mediated active DNA demethylation. Biochem Biophys Res Commun 2015; 466:138-45. [DOI: 10.1016/j.bbrc.2015.08.122] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 08/23/2015] [Indexed: 12/21/2022]
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20
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Suwa Y, Gu J, Baranovskiy AG, Babayeva ND, Pavlov YI, Tahirov TH. Crystal Structure of the Human Pol α B Subunit in Complex with the C-terminal Domain of the Catalytic Subunit. J Biol Chem 2015; 290:14328-37. [PMID: 25847248 DOI: 10.1074/jbc.m115.649954] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [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: 03/04/2015] [Indexed: 11/06/2022] Open
Abstract
In eukaryotic DNA replication, short RNA-DNA hybrid primers synthesized by primase-DNA polymerase α (Prim-Pol α) are needed to start DNA replication by the replicative DNA polymerases, Pol δ and Pol ϵ. The C terminus of the Pol α catalytic subunit (p180C) in complex with the B subunit (p70) regulates the RNA priming and DNA polymerizing activities of Prim-Pol α. It tethers Pol α and primase, facilitating RNA primer handover from primase to Pol α. To understand these regulatory mechanisms and to reveal the details of human Pol α organization, we determined the crystal structure of p70 in complex with p180C. The structured portion of p70 includes a phosphodiesterase (PDE) domain and an oligonucleotide/oligosaccharide binding (OB) domain. The N-terminal domain and the linker connecting it to the PDE domain are disordered in the reported crystal structure. The p180C adopts an elongated asymmetric saddle shape, with a three-helix bundle in the middle and zinc-binding modules (Zn1 and Zn2) on each side. The extensive p180C-p70 interactions involve 20 hydrogen bonds and a number of hydrophobic interactions resulting in an extended buried surface of 4080 Å(2). Importantly, in the structure of the p180C-p70 complex with full-length p70, the residues from the N-terminal to the OB domain contribute to interactions with p180C. The comparative structural analysis revealed both the conserved features and the differences between the human and yeast Pol α complexes.
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Affiliation(s)
- Yoshiaki Suwa
- From the Eppley Institute for Research in Cancer and Allied Diseases and
| | - Jianyou Gu
- From the Eppley Institute for Research in Cancer and Allied Diseases and
| | | | - Nigar D Babayeva
- From the Eppley Institute for Research in Cancer and Allied Diseases and
| | - Youri I Pavlov
- From the Eppley Institute for Research in Cancer and Allied Diseases and the Departments of Biochemistry and Molecular Biology and Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Tahir H Tahirov
- From the Eppley Institute for Research in Cancer and Allied Diseases and
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21
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Abstract
DNA replication in bacteria and eukaryotes requires the activity of DNA primase, a DNA-dependent RNA polymerase that lays short RNA primers for DNA polymerases. Eukaryotic and archaeal primases are heterodimers consisting of small catalytic and large accessory subunits, both of which are necessary for RNA primer synthesis. Understanding of RNA synthesis priming in eukaryotes is currently limited due to the lack of crystal structures of the full-length primase and its complexes with substrates in initiation and elongation states. Here we report the crystal structure of the full-length human primase, revealing the precise overall organization of the enzyme, the relative positions of its functional domains, and the mode of its interaction with modeled DNA and RNA. The structure indicates that the dramatic conformational changes in primase are necessary to accomplish the initiation and then elongation of RNA synthesis. The presence of a long linker between the N- and C-terminal domains of p58 provides the structural basis for the bulk of enzyme's conformational flexibility. Deletion of most of this linker affected the initiation and elongation steps of the primer synthesis.
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Affiliation(s)
- Andrey G Baranovskiy
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Yinbo Zhang
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198, the Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198, and
| | - Yoshiaki Suwa
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Nigar D Babayeva
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Jianyou Gu
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Youri I Pavlov
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198, the Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198, and the Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Tahir H Tahirov
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198,
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Abstract
Natural tetracyclic diterpenoid aphidicolin is a potent and specific inhibitor of B-family DNA polymerases, haltering replication and possessing a strong antimitotic activity in human cancer cell lines. Clinical trials revealed limitations of aphidicolin as an antitumor drug because of its low solubility and fast clearance from human plasma. The absence of structural information hampered the improvement of aphidicolin-like inhibitors: more than 50 modifications have been generated so far, but all have lost the inhibitory and antitumor properties. Here we report the crystal structure of the catalytic core of human DNA polymerase α (Pol α) in the ternary complex with an RNA-primed DNA template and aphidicolin. The inhibitor blocks binding of dCTP by docking at the Pol α active site and by rotating the template guanine. The structure provides a plausible mechanism for the selectivity of aphidicolin incorporation opposite template guanine and explains why previous modifications of aphidicolin failed to improve its affinity for Pol α. With new structural information, aphidicolin becomes an attractive lead compound for the design of novel derivatives with enhanced inhibitory properties for B-family DNA polymerases.
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Affiliation(s)
- Andrey G Baranovskiy
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Nigar D Babayeva
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Yoshiaki Suwa
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Jianyou Gu
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Youri I Pavlov
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE 68198, USA Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Tahir H Tahirov
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA
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Maruta Y, Kuwata T, Tanaka K, Nakahara Y, Ramirez K, Alam M, Egami Y, Hirata I, Suwa Y, Morioka H, Matsushita S. Post-attachment Neutralization by Single-chain Variable Fragment (scFv) from an Anti-V3 Monoclonal Antibody with Cross-reactivity. AIDS Res Hum Retroviruses 2014. [DOI: 10.1089/aid.2014.5452.abstract] [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: 11/12/2022] Open
Affiliation(s)
- Yasuhiro Maruta
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Takeo Kuwata
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Kazuki Tanaka
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Yusuke Nakahara
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Kristel Ramirez
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Muntasir Alam
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Yoshika Egami
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Izumi Hirata
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
| | - Yoshiaki Suwa
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Hiroshi Morioka
- Department of Analytical and Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Shuzo Matsushita
- Matsushita Project Laboratory, Center for AIDS Research, Kumamoto University, Kumamoto, Japan
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Gu J, Babayeva ND, Suwa Y, Baranovskiy AG, Price DH, Tahirov TH. Crystal structure of HIV-1 Tat complexed with human P-TEFb and AFF4. Cell Cycle 2014; 13:1788-97. [PMID: 24727379 DOI: 10.4161/cc.28756] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Developing anti-viral therapies targeting HIV-1 transcription has been hampered by the limited structural knowledge of the proteins involved. HIV-1 hijacks the cellular machinery that controls RNA polymerase II elongation through an interaction of HIV-1 Tat with the positive transcription elongation factor P-TEFb, which interacts with an AF4 family member (AFF1/2/3/4) in the super elongation complex (SEC). Because inclusion of Tat•P-TEFb into the SEC is critical for HIV transcription, we have determined the crystal structure of the Tat•AFF4•P-TEFb complex containing HIV-1 Tat (residues 1-48), human Cyclin T1 (1-266), human Cdk9 (7-332), and human AFF4 (27-69). Tat binding to AFF4•P-TEFb causes concerted structural changes in AFF4 via a shift of helix H5' of Cyclin T1 and the α-3 10 helix of AFF4. The interaction between Tat and AFF4 provides structural constraints that explain tolerated Tat mutations. Analysis of the Tat-binding surface of AFF4 coupled with modeling of all other AF4 family members suggests that AFF1 and AFF4 would be preferred over AFF2 or AFF3 for interaction with Tat•P-TEFb. The structure establishes that the Tat-TAR recognition motif (TRM) in Cyclin T1 interacts with both Tat and AFF4, leading to the exposure of arginine side chains for binding to TAR RNA. Furthermore, modeling of Tat Lys28 acetylation suggests that the acetyl group would be in a favorable position for H-bond formation with Asn257 of TRM, thereby stabilizing the TRM in Cyclin T1, and provides a structural basis for the modulation of TAR RNA binding by acetylation of Tat Lys28.
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Affiliation(s)
- Jianyou Gu
- Eppley Institute for Research in Cancer and Allied Diseases; University of Nebraska Medical Center; Omaha, NE USA
| | - Nigar D Babayeva
- Eppley Institute for Research in Cancer and Allied Diseases; University of Nebraska Medical Center; Omaha, NE USA
| | - Yoshiaki Suwa
- Eppley Institute for Research in Cancer and Allied Diseases; University of Nebraska Medical Center; Omaha, NE USA
| | - Andrey G Baranovskiy
- Eppley Institute for Research in Cancer and Allied Diseases; University of Nebraska Medical Center; Omaha, NE USA
| | - David H Price
- Biochemistry Department; University of Iowa; Iowa City, IA USA
| | - Tahir H Tahirov
- Eppley Institute for Research in Cancer and Allied Diseases; University of Nebraska Medical Center; Omaha, NE USA
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Baranovskiy AG, Gu J, Babayeva ND, Agarkar VB, Suwa Y, Tahirov TH. Crystallization and preliminary X-ray diffraction analysis of human DNA primase. Acta Crystallogr F Struct Biol Commun 2014; 70:206-10. [PMID: 24637758 DOI: 10.1107/s2053230x13034432] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 12/21/2013] [Indexed: 12/31/2022]
Abstract
Human primase synthesizes RNA primers and transfers them to the active site of Pol α with subsequent extension with dNTPs. Human primase is a heterodimer of two subunits: a small catalytic subunit (p49) and a large subunit (p58). The structural details of the initiation and elongation steps of primer synthesis, as well as primer length counting, are not known. To address these questions, structural studies of human primase were initiated. Two types of crystals were obtained. The best diffracting crystals belonged to space group P1, with unit-cell parameters a = 86.2, b = 88.9, c = 94.68 Å, α = 93.82, β = 96.57, γ = 111.72°, and contained two heterodimers of full-length p49 and p59 subunits in the asymmetric unit.
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Affiliation(s)
- Andrey G Baranovskiy
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-7696, USA
| | - Jianyou Gu
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-7696, USA
| | - Nigar D Babayeva
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-7696, USA
| | - Vinod B Agarkar
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-7696, USA
| | - Yoshiaki Suwa
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-7696, USA
| | - Tahir H Tahirov
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-7696, USA
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26
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Minomo A, Ishima Y, Chuang VT, Suwa Y, Kragh-Hansen U, Narisoko T, Morioka H, Maruyama T, Otagiri M. Albumin domain II mutant with high bilirubin binding affinity has a great potential as serum bilirubin excretion enhancer for hyperbilirubinemia treatment. Biochim Biophys Acta Gen Subj 2013; 1830:2917-23. [DOI: 10.1016/j.bbagen.2013.01.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 12/14/2012] [Accepted: 01/07/2013] [Indexed: 11/24/2022]
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27
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Yasuda T, Waki M, Kuroda K, Hanajima D, Fukumoto Y, Yamagishi T, Suwa Y, Suzuki K. Responses of community structure of amoA
-encoding archaea and ammonia-oxidizing bacteria in ammonia biofilter with rockwool mixtures to the gradual increases in ammonium and nitrate. J Appl Microbiol 2012. [DOI: 10.1111/jam.12091] [Citation(s) in RCA: 7] [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. Yasuda
- Institute of Livestock and Grassland Science; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
| | - M. Waki
- Institute of Livestock and Grassland Science; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
| | - K. Kuroda
- Kyushu Okinawa Agricultural Research Center; National Agriculture and Food Research Organization; Koshi Kumamoto Japan
| | - D. Hanajima
- Agricultural Research Center for Hokkaido Region; National Agriculture and Food Research Organization; Sapporo Hokkaido Japan
| | - Y. Fukumoto
- Institute of Livestock and Grassland Science; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
| | - T. Yamagishi
- Institute of Environmental Management Technology; National Institute of Advanced Industrial Science and Technology; Tsukuba Ibaraki Japan
| | - Y. Suwa
- Department of Biological Sciences; Chuo University; Tokyo Japan
| | - K. Suzuki
- Institute of Livestock and Grassland Science; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
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28
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Nakamura Y, Kato H, Nishikawa T, Iwasaki N, Suwa Y, Rotinsulu H, Losung F, Maarisit W, Mangindaan REP, Morioka H, Yokosawa H, Tsukamoto S. Siladenoserinols A-L: new sulfonated serinol derivatives from a tunicate as inhibitors of p53-Hdm2 interaction. Org Lett 2012; 15:322-5. [PMID: 23268733 DOI: 10.1021/ol3032363] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Siladenoserinols A-L were isolated from a tunicate as inhibitors of p53-Hdm2 interaction, a promising target for cancer chemotherapy. Their structures including the absolute configurations were elucidated to be new sulfonated serinol derivatives, each of which contains a 6,8-dioxabicyclo[3.2.1]octane unit and either glycerophosphocholine or glycerophosphoethanolamine moiety. They inhibited p53-Hdm2 interaction with IC(50) values of 2.0-55 μM. Among them, siladenoserinol A and B exhibited the strongest inhibition with an IC(50) value of 2.0 μM.
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Affiliation(s)
- Yuichi Nakamura
- Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan
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Sasao A, Suwa Y, Aso T, Kohmatsu H, Ohtsu Y, Mishima S, Yonemitsu K, Morioka H, Nishitani Y. Single-chain variable fragment technology in forensic toxicological analysis: production of an antibody to fluvoxamine. Forensic Toxicol 2012. [DOI: 10.1007/s11419-012-0163-4] [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: 10/27/2022]
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30
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Ushiyama S, Umaoka H, Kato H, Suwa Y, Morioka H, Rotinsulu H, Losung F, Mangindaan REP, de Voogd NJ, Yokosawa H, Tsukamoto S. Manadosterols A and B, sulfonated sterol dimers inhibiting the Ubc13-Uev1A interaction, isolated from the marine sponge Lissodendryx fibrosa. J Nat Prod 2012; 75:1495-1499. [PMID: 22873794 DOI: 10.1021/np300352u] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Two new dimeric sterols, manadosterols A (1) and B (2), were isolated from the marine sponge Lissodendryx fibrosa collected in Indonesia. The two compounds are comprised of two sulfonated sterol cores connected through the respective side chains. Manadosterols A (1) and B (2) inhibited the Ubc13-Uev1A interaction with IC(50) values of 0.09 and 0.13 μM, respectively. They are the second and third natural compounds showing inhibitory activities against the Ubc13-Uev1A interaction and are more potent than leucettamol A (IC(50), 106 μM), the first such inhibitor, isolated from another marine sponge.
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Affiliation(s)
- Shuntaro Ushiyama
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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31
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Suwa Y, Nakamura T, Toma S, Koga T, Shuto T, Ikemizu S, Kai H, Morioka H, Yamagata Y. Structural basis for DNA recognition and binding specificity by the transcription factor Ets2. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311082535] [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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Shibata M, Kiuchi K, Sekiguchi YI, Suwa Y. Truncated Moment Formalism for Radiation Hydrodynamics in Numerical Relativity. ACTA ACUST UNITED AC 2011. [DOI: 10.1143/ptp.125.1255] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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33
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Miyata M, Sato T, Kugimiya M, Sho M, Nakamura T, Ikemizu S, Chirifu M, Mizuguchi M, Nabeshima Y, Suwa Y, Morioka H, Arimori T, Suico MA, Shuto T, Sako Y, Momohara M, Koga T, Morino-Koga S, Yamagata Y, Kai H. The Crystal Structure of the Green Tea Polyphenol (−)-Epigallocatechin Gallate−Transthyretin Complex Reveals a Novel Binding Site Distinct from the Thyroxine Binding Site,. Biochemistry 2010; 49:6104-14. [DOI: 10.1021/bi1004409] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masanori Miyata
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Takashi Sato
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Miyuki Kugimiya
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Misato Sho
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | | | | | | | - Mineyuki Mizuguchi
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0914, Japan
| | - Yuko Nabeshima
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0914, Japan
| | | | | | | | - Mary Ann Suico
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Tsuyoshi Shuto
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Yasuhiro Sako
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Mamiko Momohara
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Tomoaki Koga
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Saori Morino-Koga
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | | | - Hirofumi Kai
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
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Matheson VG, Forney LJ, Suwa Y, Nakatsu CH, Sexstone AJ, Holben WE. Evidence for Acquisition in Nature of a Chromosomal 2,4-Dichlorophenoxyacetic Acid/(alpha)-Ketoglutarate Dioxygenase Gene by Different Burkholderia spp. Appl Environ Microbiol 2010; 62:2457-63. [PMID: 16535356 PMCID: PMC1388894 DOI: 10.1128/aem.62.7.2457-2463.1996] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We characterized the gene required to initiate the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) by the soil bacterium Burkholderia sp. strain TFD6, which hybridized to the tfdA gene of the canonical 2,4-D catabolic plasmid pJP4 under low-stringency conditions. Cleavage of the ether bond of 2,4-D by cell extracts of TFD6 proceeded by an (alpha)-ketoglutarate-dependent reaction, characteristic of TfdA (F. Fukumori and R. P. Hausinger, J. Bacteriol. 175:2083-2086, 1993). The TFD6 tfdA gene was identified in a recombinant plasmid which complemented a tfdA transposon mutant of TFD6 created by chromosomal insertion of Tn5. The plasmid also expressed TfdA activity in Escherichia coli DH5(alpha), as evidenced by enzyme assays with cell extracts. Sequence analysis of the tfdA gene and flanking regions from strain TFD6 showed 99.5% similarity to a tfdA gene cloned from the chromosome of a different Burkholderia species (strain RASC) isolated from a widely separated geographical area. This chromosomal gene has 77.2% sequence identity to tfdA from plasmid pJP4 (Y. Suwa, W. E. Holben, and L. J. Forney, abstr. Q-403, in Abstracts of the 94th General Meeting of the American Society for Microbiology 1994.). The tfdA homologs cloned from strains TFD6 and RASC are the first chromosomally encoded 2,4-D catabolic genes to be reported. The occurrence of highly similar tfdA genes in different bacterial species suggests that this chromosomal gene can be horizontally transferred.
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Miyata M, Sato T, Mizuguchi M, Nakamura T, Ikemizu S, Nabeshima Y, Susuki S, Suwa Y, Morioka H, Ando Y, Suico MA, Shuto T, Koga T, Yamagata Y, Kai H. Role of the Glutamic Acid 54 Residue in Transthyretin Stability and Thyroxine Binding,. Biochemistry 2009; 49:114-23. [DOI: 10.1021/bi901677z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masanori Miyata
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Takashi Sato
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Mineyuki Mizuguchi
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0914, Japan
| | | | | | - Yuko Nabeshima
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0914, Japan
| | - Seiko Susuki
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | | | | | - Yukio Ando
- Department of Diagnostic Medicine, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-0811, Japan
| | - Mary Ann Suico
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Tsuyoshi Shuto
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Tomoaki Koga
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | | | - Hirofumi Kai
- Departments of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
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Suwa Y, Nakamura T, Toma S, Ikemizu S, Kai H, Morioka H, Yamagata Y. Structural basis for transcriptional regulation mechanisms by the transcription factor Ets2. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308090296] [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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Kawamura S, Ando M, Nakamura T, Tsubono K, Tanaka T, Funaki I, Seto N, Numata K, Sato S, Ioka K, Kanda N, Takashima T, Agatsuma K, Akutsu T, Akutsu T, Aoyanagi KS, Arai K, Arase Y, Araya A, Asada H, Aso Y, Chiba T, Ebisuzaki T, Enoki M, Eriguchi Y, Fujimoto MK, Fujita R, Fukushima M, Futamase T, Ganzu K, Harada T, Hashimoto T, Hayama K, Hikida W, Himemoto Y, Hirabayashi H, Hiramatsu T, Hong FL, Horisawa H, Hosokawa M, Ichiki K, Ikegami T, Inoue KT, Ishidoshiro K, Ishihara H, Ishikawa T, Ishizaki H, Ito H, Itoh Y, Kamagasako S, Kawashima N, Kawazoe F, Kirihara H, Kishimoto N, Kiuchi K, Kobayashi S, Kohri K, Koizumi H, Kojima Y, Kokeyama K, Kokuyama W, Kotake K, Kozai Y, Kudoh H, Kunimori H, Kuninaka H, Kuroda K, Maeda KI, Matsuhara H, Mino Y, Miyakawa O, Miyoki S, Morimoto MY, Morioka T, Morisawa T, Moriwaki S, Mukohyama S, Musha M, Nagano S, Naito I, Nakagawa N, Nakamura K, Nakano H, Nakao K, Nakasuka S, Nakayama Y, Nishida E, Nishiyama K, Nishizawa A, Niwa Y, Ohashi M, Ohishi N, Ohkawa M, Okutomi A, Onozato K, Oohara K, Sago N, Saijo M, Sakagami M, Sakai SI, Sakata S, Sasaki M, Sato T, Shibata M, Shinkai H, Somiya K, Sotani H, Sugiyama N, Suwa Y, Tagoshi H, Takahashi K, Takahashi K, Takahashi T, Takahashi H, Takahashi R, Takahashi R, Takamori A, Takano T, Taniguchi K, Taruya A, Tashiro H, Tokuda M, Tokunari M, Toyoshima M, Tsujikawa S, Tsunesada Y, Ueda KI, Utashima M, Yamakawa H, Yamamoto K, Yamazaki T, Yokoyama J, Yoo CM, Yoshida S, Yoshino T. The Japanese space gravitational wave antenna - DECIGO. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/122/1/012006] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Suwa Y, Nakamura T, Toma S, Ikemizu S, Kai H, Yamagata Y. Preparation, crystallization and preliminary X-ray diffraction analysis of the DNA-binding domain of the Ets transcription factor in complex with target DNA. Acta Crystallogr Sect F Struct Biol Cryst Commun 2008; 64:171-4. [PMID: 18323600 PMCID: PMC2374153 DOI: 10.1107/s1744309108002662] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2007] [Accepted: 01/24/2008] [Indexed: 11/10/2022]
Abstract
The Ets2 transcription factor is a member of the Ets transcription-factor family. Ets2 plays a role in the malignancy of cancer and in Down's syndrome by regulating the transcription of various genes. The DNA-binding domain of Ets2 (Ets domain; ETSD), which contains residues that are highly conserved among Ets transcription-factor family members, was expressed as a GST-fusion protein. The aggregation of ETSD produced after thrombin cleavage could be prevented by treatment with NDSB-195 (nondetergent sulfobetaine 195). ETSD was crystallized in complex with DNA containing the Ets2 target sequence (GGAA) by the hanging-drop vapour-diffusion method. The best crystals were grown using 25% PEG 3350, 80 mM magnesium acetate, 50 mM sodium cacodylate pH 5.0/5.5 as the reservoir at 293 K. The crystals belonged to space group C2, with unit-cell parameters a = 85.89, b = 95.52, c = 71.89 A, beta = 101.7 degrees and a V(M) value of 3.56 A(3) Da(-1). Diffraction data were collected to a resolution of 3.0 A.
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Affiliation(s)
- Yoshiaki Suwa
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - Teruya Nakamura
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - Sachiko Toma
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - Shinji Ikemizu
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - Hirofumi Kai
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - Yuriko Yamagata
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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Koga K, Taguchi A, Koshimizu S, Suwa Y, Yamada Y, Shirasaka N, Yoshizumi H. Reactive Oxygen Scavenging Activity of Matured Whiskey and Its Active Polyphenols. J Food Sci 2007; 72:S212-7. [DOI: 10.1111/j.1750-3841.2007.00311.x] [Citation(s) in RCA: 19] [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: 11/30/2022]
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Lina BAR, Wolterbeek APM, Suwa Y, Fujikawa S, Ishikura Y, Tsuda S, Dohnalek M. Subchronic (13-week) oral toxicity study, preceded by an in utero exposure phase, with arachidonate-enriched triglyceride oil (SUNTGA40S) in rats. Food Chem Toxicol 2006; 44:326-35. [PMID: 16168548 DOI: 10.1016/j.fct.2005.08.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2005] [Revised: 06/29/2005] [Accepted: 08/04/2005] [Indexed: 10/25/2022]
Abstract
Polyunsaturated fatty acids (PUFAs), such as arachidonic acid (ARA) and docosahexaenoic acid (DHA) are natural constituents found in human milk, fish oil or egg yolk. Until recently, infant formulas, though providing the essential fatty acid precursors for these PUFAs, did not contain preformed ARA or DHA. In this study the safety of SUNTGA40S as source of ARA, not only for use in infant formulas but also for nutritional products or food supplements, was evaluated in a subchronic study in Wistar rats, preceded by a 4-week pretreatment period of parental (F(0)) rats and exposure of the F(0) dams throughout mating, gestation and lactation. SUNTGA40S was administered at dietary levels of 0.5%, 1.5% and 5% (wt/wt) adjusted with corn oil to 5.76% added fat. An additional group received 3.65% (wt/wt) SUNTGA40S in conjunction with 2.11% (wt/wt) high DHA Tuna oil, providing an ARA:DHA ratio of 2.7:1. High-fat and low-fat controls received basal diet with or without 5.76% corn-oil supplement. The content, stability and homogeneous distribution of the test substances in the diet were confirmed under study conditions. The administration of SUNTGA40S, with or without DHA oil, did not affect health, growth, fertility or reproductive performance of the parental rats, nor pup characteristics (condition, weight gain, viability, number per litter or sex ratio). In the subchronic study with the offspring (F(1)) rats, no significant differences were found in condition, neurobehavioural observations, ophthalmoscopy, growth, urinalysis or macroscopic and microscopic findings between the test groups and the low-fat or the high-fat controls. In males of the 5% SUNTGA40S and the SUNTGA40S/DHA group, red blood cell counts, haemoglobin concentration and packed cell volume were lower and reticulocytes were slightly higher than in the high-fat and low-fat control groups. Cholesterol, triglycerides and phospholipids in plasma were lower than in the high-fat controls in both sexes in the 5% SUNTGA40S and the SUNTGA40S/DHA group and (for triglycerides only) in the 1.5% SUNTGA group. Due to the administration of extra dietary fat, food intake and prothrombin time (males only) were lower and alkaline phosphatase activity was higher in all the high-fat groups, including the corn-oil controls, as compared to the low-fat controls. The weight of the spleen was higher in males of the 5% SUNTGA40S and the SUNTGA40S/DHA group compared to both the low-fat and the high-fat controls. The effects noted in this study at high dose levels of SUNTGA40S are consistent with previously reported physiological responses to dietary intake of high PUFA containing oils. The present results provide evidence that SUNTGA40S is a safe source of arachidonic acid. Except during lactation when the intake in dams doubled, 5% Suntga40S in the diet was equivalent to an overall intake of approximately 3g/kg body weight/day in F(0) and F(1) animals.
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Affiliation(s)
- B A R Lina
- TNO Quality of Life, Toxicology and Applied Pharmacology, Zeist, The Netherlands.
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41
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Bae HS, Yamagishi T, Suwa Y. Developing and sustaining 3-chlorophenol-degrading populations in up-flow anaerobic column reactors under circum-denitrifying conditions. Appl Microbiol Biotechnol 2002; 59:118-24. [PMID: 12073142 DOI: 10.1007/s00253-002-0974-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2001] [Revised: 01/24/2002] [Accepted: 02/07/2002] [Indexed: 10/27/2022]
Abstract
Microbial consortia capable of degrading 3-chlorophenol (3-CP) were enriched in continuous up-flow column reactors under circum-denitrifying conditions. 3-CP degradation capability was developed and sustained when 3-CP was supplied at 16-21 microM, although suppression of the 3-CP degradation capability was observed when 3-CP was supplied at 42 microM. When 3-CP was stably degraded, the ratio of nitrate consumption to 3-CP degradation approached the theoretical stoichiometric value, which was calculated by assuming a 3-CP degradation-dependent nitrate reduction. Batch-incubation experiments demonstrated that the microbial consortium that was enriched in the column reactors required either nitrate or oxygen for degrading 3-CP, while 3-CP was not degraded under sulfate-degrading conditions. Although many attempts were made to sustain the microbial 3-CP degradation capability under denitrifying conditions, mostly in batch cultures, none of them have been successful so far. Therefore, the results obtained in this study may be the first to demonstrate sustainable 3-CP degradation capability under circum-denitrifying conditions.
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Affiliation(s)
- H S Bae
- Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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Yamagishi T, Leite J, Ueda S, Yamaguchi F, Suwa Y. Simultaneous removal of phenol and ammonia by an activated sludge process with cross-flow filtration. Water Res 2001; 35:3089-3096. [PMID: 11487105 DOI: 10.1016/s0043-1354(01)00032-x] [Citation(s) in RCA: 18] [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] [Indexed: 05/23/2023]
Abstract
Attempts were made for removing ammonia from synthetic wastewater under the presence of phenol, which is inhibitory to nitrification, by using a single-stage activated sludge process with cross-flow filtration. Activated sludge biomass which had been acclimated with phenol for over 15 years was used for the inoculum, and synthetic wastewater was continuously supplied to the process retaining biomass at 8000 mg VSS l(-1). Phenol was completely removed, and ammonia was simultaneously nitrified to nitrate; nitrification rate reached 200 mg N l(-1) d(-1) when phenol was removed at a rate up to 300 mg l(-1) d(-1). It was observed that 0-13% of the ammonia was removed via denitrification. Intermittent aeration enhanced the denitrification rate to 160 mg N l(-1) d(-1) by utilizing phenol. and approximately 24% of the denitrified nitrogen was recovered as nitrous oxide. Methanol, which is the most commonly used electron donor in conventional nitrogen removal processes, did not enhance the denitrification rate of the phenol-acclimated activated sludge used in this study, however phenol did. The results suggest that this process potentially works as a space- and energy-saving nitrogen removal process by utilizing substances inhibitory to nitrifiers as electron donors for denitrification.
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Affiliation(s)
- T Yamagishi
- Department of Ecological Chemistry and Microbiology, National Institute for Resources and Environment, AIST, MITI, Tsukuba, Ibaraki, Japan.
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Takeuchi R, Suwa Y, Yamagishi T, Yonezawa Y. Anaerobic transformation of chlorophenols in methanogenic sludge unexposed to chlorophenols. Chemosphere 2000; 41:1457-1462. [PMID: 11057583 DOI: 10.1016/s0045-6535(99)00521-4] [Citation(s) in RCA: 25] [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: 05/23/2023]
Abstract
Transformation of all 19 chlorophenol (CP) isomers was investigated in a laboratory anaerobic methanogenic sludge that had not been exposed to synthetic chemicals. Concentration of CP was analyzed over time to calculate disappearance rate constants using first-order reaction kinetics and all possible CP degradation pathways were estimated. The rate constants ranged between 0.46 x 10(-3) and 0.161 day(-1). CPs were transformed via dechlorination. The chlorine atom at the ortho-position was the most easily dechlorinated, whereas dechlorination rate at the para-position was lowest. The overall pathways of CP transformation were much less diverse than that we previously found for contaminated sediment. The Dolfing hypothesis of microbial selection of the most thermodynamically favorable pathways was not applicable for CP transformation in this study as well as previous study performed by our group.
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Affiliation(s)
- R Takeuchi
- National Institute for Resources and Environment, AIST, MITI, Ecological Chemistry and Microbiology, Tsukuba, Ibaraki, Japan.
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Abstract
We attempted to clarify the relationship between cyclin E to p27(Kip1), Ki-67 and clinicopathologic features in transitional cell bladder carcinoma. Immunohistochemical staining of archival tissue specimens of transitional cell bladder carcinoma obtained from 94 patients was performed by the labeled streptavidin-biotin-peroxidase method. Overexpression of cyclin E protein was observed in 38 of the 94 (40.4%) specimens, and was positively correlated with histological grade, Ki-67 LI and p27(Kip1) labeling index (LI). These data suggest that cyclin E may be associated with aggressive tumor growth, and may have a relationship with p27(Kip1) for the regulation of cell cycle progression in transitional cell bladder carcinoma.
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Affiliation(s)
- K Makiyama
- Department of Urology, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa-ken, Japan
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Sato K, Inaba M, Suwa Y, Matsuu A, Hikasa Y, Ono K, Kagota K. Inherited defects of sodium-dependent glutamate transport mediated by glutamate/aspartate transporter in canine red cells due to a decreased level of transporter protein expression. J Biol Chem 2000; 275:6620-7. [PMID: 10692470 DOI: 10.1074/jbc.275.9.6620] [Citation(s) in RCA: 18] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Canine red cells have a high affinity Na(+)/K(+)-dependent glutamate transporter. We herein demonstrate that this transport is mediated by the canine homologue of glutamate/aspartate transporter (GLAST), one of the glutamate transporter subtypes abundant in the central nervous system. We also demonstrate that GLAST is the most ubiquitous glutamate transporter among the transporter subtypes that have been cloned to date. The GLAST protein content was extremely reduced in variant red cells, low glutamate transport (LGlut) red cells characterized by an inherited remarkable decrease in glutamate transport activity. All LGluT dogs carried a missense mutation of Gly(492) to Ser (G492S) in either the heterozygous or homozygous state. The GLAST protein with G492S mutation was fully functional in glutamate transport in Xenopus oocytes. However, G492S GLAST exhibited a marked decrease in activity after the addition of cycloheximide, while the wild type showed no significant change, indicating that G492S GLAST was unstable compared with the wild-type transporter. Moreover, LGluT dogs, but not normal dogs, heterozygous for the G492S mutation showed a selective decrease in the accumulation of GLAST mRNA from the normal allele. Based on these findings, we conclude that a complicated heterologous combination of G492S mutation and some transcriptional defect contributes to the pathogenesis of the LGluT red cell phenotype.
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Affiliation(s)
- K Sato
- Department of Veterinary Internal Medicine, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
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Kouzai T, Takase K, Suwa Y, Moriyama M, Mou M, Kurata H, Nakamura N. [Renal cell carcinoma in a horseshoe kidney with abdominal aortic aneurysm: a case report]. Hinyokika Kiyo 2000; 46:15-7. [PMID: 10723658] [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: 02/15/2023]
Abstract
We herein report a case of renal cell carcinoma in a horseshoe kidney with an abdominal aortic aneurysm in a 69-year-old man. Radiological examinations showed a left renal tumor, horseshoe kidney and abdominal aortic aneurysm. We performed a left radical nephrectomy with the division of the isthmus and artificial graft through an abdominal transperitoneal approach. Histological findings revealed clear cell type renal cell carcinoma without invasion of the capsule or renal pelvis. Only 31 cases of renal cell carcinoma in a horseshoe kidney have been reported in Japan, and our case is the 32nd. No case with abdominal aortic aneurysm has been reported previously. We assume that abdominal aortic aneurysm was associated with renal cell carcinoma by chance in the horseshoe kidney in this case. The arterial and venous supplies vary from case to case. We emphasize that arteriography and venography are very important preoperative procedures.
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Affiliation(s)
- T Kouzai
- Department of Urology, Yokohama Municipal Citizen's Hospital
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Koda H, Yokoo Y, Matsumoto N, Suwa Y, Fukazawa H, Ishida H, Tsuji K, Nukaya H, Kuriyama K. Antagonistic effect of N-methyltyramine on alpha2-adrenoceptor in mice. Jpn J Pharmacol 1999; 81:313-5. [PMID: 10622222 DOI: 10.1254/jjp.81.313] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
We examined the effect of N-methyltyramine (NMT) on alpha2-adrenoceptor. NMT (10(-8)-10(-3) M) inhibited the binding of [3H]p-aminoclonidine to alpha2-adrenoceptor dose-dependently. However, the IC50 value for NMT (5.53 x 10(-6) M) was higher than that for RX821002, an alpha2-adrenoceptor antagonist (1.07 x 10(-8) M). RX821002 (5 mg/kg, i.p.) inhibited hypermotility induced by scopolamine (8 mg/kg, s.c.) in male ddY mice. NMT (20 or 100 mg/kg, i.p.) was found to have a dose-dependent inhibitory effect similar to that of RX821002. These findings indicate that NMT has the properties of an alpha2-adrenoceptor antagonist. However, the affinity of NMT for alpha2-adrenoceptor is weaker than that of RX821002.
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Affiliation(s)
- H Koda
- Products Safety & Alcohol Science Laboratory, Suntory Limited, Mishima-gun, Osaka, Japan
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Yokoo Y, Kohda H, Kusumoto A, Naoki H, Matsumoto N, Amachi T, Suwa Y, Fukazawa H, Ishida H, Tsuji K, Nukaya H. Isolation from beer and structural determination of a potent stimulant of gastrin release. Alcohol Alcohol 1999; 34:161-8. [PMID: 10344776 DOI: 10.1093/alcalc/34.2.161] [Citation(s) in RCA: 24] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Beer was subjected to five successive chromatographic procedures to isolate the gastrin release-inducing activity, guided by bioassay of the fractions in anaesthetized Donryu rats. The procedures were: (1) hydrophobic interaction chromatography (aqueous effluent with an HP20 column); (2) weak cation-exchange chromatography (1 M acetic acid eluate with a CM Sephadex C-25 column); (3) gel filtration (methanol eluate with a Sephadex LH-20 column); (4) same as (2); (5) high-performance liquid chromatography (YMC-Pack ODS-AM with 7% acetonitrile-0.01 M HCl). The active component finally isolated had a specific activity approximately 10000 times higher than that of beer. It was identified by means of mass, 1H- and 13C-nuclear magnetic resonance spectral analyses as N-methyltyramine (NMT). The dose of NMT giving maximal gastrin-releasing activity was 25 microg/kg, and the 50% effective dose was approximately 10 microg/kg on oral administration to rats. NMT was isolated and identified as a gastrin release inducer in beer. Its concentration in beer is sufficient to account for most of the activity of beer.
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Affiliation(s)
- Y Yokoo
- Technical Development Department, Suntory Limited, Mishima-Gun, Osaka, Japan
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