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Effects of empagliflozin on progression of chronic kidney disease: a prespecified secondary analysis from the empa-kidney trial. Lancet Diabetes Endocrinol 2024; 12:39-50. [PMID: 38061371 PMCID: PMC7615591 DOI: 10.1016/s2213-8587(23)00321-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 12/23/2023]
Abstract
BACKGROUND Sodium-glucose co-transporter-2 (SGLT2) inhibitors reduce progression of chronic kidney disease and the risk of cardiovascular morbidity and mortality in a wide range of patients. However, their effects on kidney disease progression in some patients with chronic kidney disease are unclear because few clinical kidney outcomes occurred among such patients in the completed trials. In particular, some guidelines stratify their level of recommendation about who should be treated with SGLT2 inhibitors based on diabetes status and albuminuria. We aimed to assess the effects of empagliflozin on progression of chronic kidney disease both overall and among specific types of participants in the EMPA-KIDNEY trial. METHODS EMPA-KIDNEY, a randomised, controlled, phase 3 trial, was conducted at 241 centres in eight countries (Canada, China, Germany, Italy, Japan, Malaysia, the UK, and the USA), and included individuals aged 18 years or older with an estimated glomerular filtration rate (eGFR) of 20 to less than 45 mL/min per 1·73 m2, or with an eGFR of 45 to less than 90 mL/min per 1·73 m2 with a urinary albumin-to-creatinine ratio (uACR) of 200 mg/g or higher. We explored the effects of 10 mg oral empagliflozin once daily versus placebo on the annualised rate of change in estimated glomerular filtration rate (eGFR slope), a tertiary outcome. We studied the acute slope (from randomisation to 2 months) and chronic slope (from 2 months onwards) separately, using shared parameter models to estimate the latter. Analyses were done in all randomly assigned participants by intention to treat. EMPA-KIDNEY is registered at ClinicalTrials.gov, NCT03594110. FINDINGS Between May 15, 2019, and April 16, 2021, 6609 participants were randomly assigned and then followed up for a median of 2·0 years (IQR 1·5-2·4). Prespecified subgroups of eGFR included 2282 (34·5%) participants with an eGFR of less than 30 mL/min per 1·73 m2, 2928 (44·3%) with an eGFR of 30 to less than 45 mL/min per 1·73 m2, and 1399 (21·2%) with an eGFR 45 mL/min per 1·73 m2 or higher. Prespecified subgroups of uACR included 1328 (20·1%) with a uACR of less than 30 mg/g, 1864 (28·2%) with a uACR of 30 to 300 mg/g, and 3417 (51·7%) with a uACR of more than 300 mg/g. Overall, allocation to empagliflozin caused an acute 2·12 mL/min per 1·73 m2 (95% CI 1·83-2·41) reduction in eGFR, equivalent to a 6% (5-6) dip in the first 2 months. After this, it halved the chronic slope from -2·75 to -1·37 mL/min per 1·73 m2 per year (relative difference 50%, 95% CI 42-58). The absolute and relative benefits of empagliflozin on the magnitude of the chronic slope varied significantly depending on diabetes status and baseline levels of eGFR and uACR. In particular, the absolute difference in chronic slopes was lower in patients with lower baseline uACR, but because this group progressed more slowly than those with higher uACR, this translated to a larger relative difference in chronic slopes in this group (86% [36-136] reduction in the chronic slope among those with baseline uACR <30 mg/g compared with a 29% [19-38] reduction for those with baseline uACR ≥2000 mg/g; ptrend<0·0001). INTERPRETATION Empagliflozin slowed the rate of progression of chronic kidney disease among all types of participant in the EMPA-KIDNEY trial, including those with little albuminuria. Albuminuria alone should not be used to determine whether to treat with an SGLT2 inhibitor. FUNDING Boehringer Ingelheim and Eli Lilly.
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T, Tamori Y, Tamura R, Tamura Y, Tan CHH, Tan EZZ, Tanabe A, Tanabe K, Tanaka A, Tanaka A, Tanaka N, Tang S, Tang Z, Tanigaki K, Tarlac M, Tatsuzawa A, Tay JF, Tay LL, Taylor J, Taylor K, Taylor K, Te A, Tenbusch L, Teng KS, Terakawa A, Terry J, Tham ZD, Tholl S, Thomas G, Thong KM, Tietjen D, Timadjer A, Tindall H, Tipper S, Tobin K, Toda N, Tokuyama A, Tolibas M, Tomita A, Tomita T, Tomlinson J, Tonks L, Topf J, Topping S, Torp A, Torres A, Totaro F, Toth P, Toyonaga Y, Tripodi F, Trivedi K, Tropman E, Tschope D, Tse J, Tsuji K, Tsunekawa S, Tsunoda R, Tucky B, Tufail S, Tuffaha A, Turan E, Turner H, Turner J, Turner M, Tuttle KR, Tye YL, Tyler A, Tyler J, Uchi H, Uchida H, Uchida T, Uchida T, Udagawa T, Ueda S, Ueda Y, Ueki K, Ugni S, Ugwu E, Umeno R, Unekawa C, Uozumi K, Urquia K, Valleteau A, Valletta C, van Erp R, Vanhoy C, Varad V, Varma R, Varughese A, Vasquez P, Vasseur A, Veelken R, Velagapudi C, Verdel K, Vettoretti S, Vezzoli G, Vielhauer V, Viera R, Vilar E, Villaruel S, 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Yamada N, Yamagata K, Yamaguchi M, Yamaji Y, Yamamoto A, Yamamoto S, Yamamoto S, Yamamoto T, Yamanaka A, Yamano T, Yamanouchi Y, Yamasaki N, Yamasaki Y, Yamasaki Y, Yamashita C, Yamauchi T, Yan Q, Yanagisawa E, Yang F, Yang L, Yano S, Yao S, Yao Y, Yarlagadda S, Yasuda Y, Yiu V, Yokoyama T, Yoshida S, Yoshidome E, Yoshikawa H, Young A, Young T, Yousif V, Yu H, Yu Y, Yuasa K, Yusof N, Zalunardo N, Zander B, Zani R, Zappulo F, Zayed M, Zemann B, Zettergren P, Zhang H, Zhang L, Zhang L, Zhang N, Zhang X, Zhao J, Zhao L, Zhao S, Zhao Z, Zhong H, Zhou N, Zhou S, Zhu D, Zhu L, Zhu S, Zietz M, Zippo M, Zirino F, Zulkipli FH. Impact of primary kidney disease on the effects of empagliflozin in patients with chronic kidney disease: secondary analyses of the EMPA-KIDNEY trial. Lancet Diabetes Endocrinol 2024; 12:51-60. [PMID: 38061372 DOI: 10.1016/s2213-8587(23)00322-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 12/23/2023]
Abstract
BACKGROUND The EMPA-KIDNEY trial showed that empagliflozin reduced the risk of the primary composite outcome of kidney disease progression or cardiovascular death in patients with chronic kidney disease mainly through slowing progression. We aimed to assess how effects of empagliflozin might differ by primary kidney disease across its broad population. METHODS EMPA-KIDNEY, a randomised, controlled, phase 3 trial, was conducted at 241 centres in eight countries (Canada, China, Germany, Italy, Japan, Malaysia, the UK, and the USA). Patients were eligible if their estimated glomerular filtration rate (eGFR) was 20 to less than 45 mL/min per 1·73 m2, or 45 to less than 90 mL/min per 1·73 m2 with a urinary albumin-to-creatinine ratio (uACR) of 200 mg/g or higher at screening. They were randomly assigned (1:1) to 10 mg oral empagliflozin once daily or matching placebo. Effects on kidney disease progression (defined as a sustained ≥40% eGFR decline from randomisation, end-stage kidney disease, a sustained eGFR below 10 mL/min per 1·73 m2, or death from kidney failure) were assessed using prespecified Cox models, and eGFR slope analyses used shared parameter models. Subgroup comparisons were performed by including relevant interaction terms in models. EMPA-KIDNEY is registered with ClinicalTrials.gov, NCT03594110. FINDINGS Between May 15, 2019, and April 16, 2021, 6609 participants were randomly assigned and followed up for a median of 2·0 years (IQR 1·5-2·4). Prespecified subgroupings by primary kidney disease included 2057 (31·1%) participants with diabetic kidney disease, 1669 (25·3%) with glomerular disease, 1445 (21·9%) with hypertensive or renovascular disease, and 1438 (21·8%) with other or unknown causes. Kidney disease progression occurred in 384 (11·6%) of 3304 patients in the empagliflozin group and 504 (15·2%) of 3305 patients in the placebo group (hazard ratio 0·71 [95% CI 0·62-0·81]), with no evidence that the relative effect size varied significantly by primary kidney disease (pheterogeneity=0·62). The between-group difference in chronic eGFR slopes (ie, from 2 months to final follow-up) was 1·37 mL/min per 1·73 m2 per year (95% CI 1·16-1·59), representing a 50% (42-58) reduction in the rate of chronic eGFR decline. This relative effect of empagliflozin on chronic eGFR slope was similar in analyses by different primary kidney diseases, including in explorations by type of glomerular disease and diabetes (p values for heterogeneity all >0·1). INTERPRETATION In a broad range of patients with chronic kidney disease at risk of progression, including a wide range of non-diabetic causes of chronic kidney disease, empagliflozin reduced risk of kidney disease progression. Relative effect sizes were broadly similar irrespective of the cause of primary kidney disease, suggesting that SGLT2 inhibitors should be part of a standard of care to minimise risk of kidney failure in chronic kidney disease. FUNDING Boehringer Ingelheim, Eli Lilly, and UK Medical Research Council.
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Kumazawa T, Kotake K, Nishimura A, Asai N, Ugajin T, Yokozeki H, Adachi T. Isolation of food-derived bacteria inducing interleukin-22 in B cells. Biosci Microbiota Food Health 2020; 39:1-9. [PMID: 32010538 PMCID: PMC6971416 DOI: 10.12938/bmfh.19-012] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 09/04/2019] [Indexed: 11/20/2022]
Abstract
Recently, we found a novel function of the lactic acid bacterium Tetragenococcus halophilus derived from miso, a fermented soy paste, that induces interleukin (IL)-22
production in B cells preferentially. IL-22 plays a critical role in barrier functions in the gut and skin. We further screened other bacteria species, namely, Enterococcus,
Lactobacillus, Lactococcus, Leuconostoc, Weissella, Pediococcus, and Bacillus, in
addition to Tetragenococcus and found that some of them possessed robust IL-22-inducible function in B cells in vitro. This process resulted in the
augmented expression of activation markers CD86 and CD69 on B and T cells, respectively. However, these observations were not correlated with IL-22 production. We isolated Bacillus
coagulans sc-09 from miso and determined it to be the best strain to induce robust IL-22 production in B cells. Furthermore, feeding B. coagulans sc-09 to mice
augmented the barrier function of the skin regardless of gut microbiota.
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Affiliation(s)
- Toshihiko Kumazawa
- Ichibiki Co., Ltd., Nagoya, Aichi 456-0018, Japan.,Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Kunihiko Kotake
- Ichibiki Co., Ltd., Nagoya, Aichi 456-0018, Japan.,Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | | | | | - Tsukasa Ugajin
- Department of Dermatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Hiroo Yokozeki
- Department of Dermatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Takahiro Adachi
- Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
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Koizumi Y, Sakata M, Shiota A, Hagihara M, Asai N, Yamagishi Y, Mikamo H. The diagnostic ability of plasma Procalcitonin levels in Gram positive bacteremia. J Infect Public Health 2020. [DOI: 10.1016/j.jiph.2020.01.081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Abstract
Tetragenococcus halophilus is a halophilic lactic acid bacterium that exists in the traditional Japanese seasoning miso-a fermented soy paste. Considering the popularity of miso as a component of healthy diet, we attempted to evaluate the immunoregulatory functions of T. halophilus spices isolated from miso. We screened 56 strains that facilitated the upregulation of activation markers such as CD86 and CD69 on B cells and T cells in vitro. Of these, 7 strains (Nos. 1, 3, 13, 15, 19, 30, and 31) were found to preferentially induce the CD86 expression on B cells. Furthermore, DNA microarray analysis revealed that T. halophilus strain No. 1 significantly augmented the gene expressions of CD86, CD70, IL-10, INF-γ, and IL-22 in B cells. We confirmed these results at the protein level by flow cytometry. Mice feeding diet containing 1% T. halophilus No. 1 exhibited significantly greater IgA production in the serum. Furthermore, a diet containing 1% T. halophilus No. 1 augmented ovoalbumin (OVA)-specific IgG titer in mice upon OVA/alum immunization. Thus, we demonstrated that T. halophilus No. 1 is a strong immunomodulatory strain with potential as a probiotic.
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Affiliation(s)
- Toshihiko Kumazawa
- Ichibiki CO., LTD. Nagoya, Japan
- Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | - Takahiro Adachi
- Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
- * E-mail:
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Kojima T, Asai S, Takahashi N, Yabe Y, Hirano Y, Kanayama Y, Kaneko A, Takemoto T, Asai N, Watanabe T, Funahashi K, Hayashi M, Ishiguro N. AB0377 Differences in Baseline Predictive Factors for Remission at 52 Weeks by Concomitant MTX Use during Tocilizumab Treatment Using Propensity Score Matched Groups. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2514] [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: 11/04/2022]
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Funahashi K, Kojima T, Takahashi N, Asai S, Takemoto T, Asai N, Watanabe T, Goto T, Shimizu M, Kariya H, Ishiguro N. SAT0069 The Validation about The Measurement of Joint Space Distance by Using Super Resolution Image and Curve Fitting Methods. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5421] [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: 11/03/2022]
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Kanayama Y, Kaneko A, Takahashi N, Kato T, Hirano Y, Hattori Y, Asai N, Ishiguro N, Kojima T. AB0334 Clinical Efficacy of Certolizumab Pegol Therapy in Patients with Japanese Active Rheumatoid Arthritis 52 Week Result ∼A Multicenter Registry Study∼. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3146] [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: 11/03/2022]
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Kojima T, Takahashi N, Kaneko A, Kida D, Hirano Y, Fujibayashi T, Yabe Y, Takagi H, Oguchi T, Miyake H, Kato T, Watanabe T, Hayashi M, Shioura T, Kanayama Y, Funahashi K, Asai S, Yoshioka Y, Terabe K, Takemoto T, Asai N, Ishiguro N. THU0115 Importance of Both Disease Activity at 12 Weeks and Clinical Response up to 12 Weeks to Predict Achievement of Low Disease Activity at 52 Weeks During Abatacept Treatment in Biologics-Switching Patients with Rheumatoid Arthritis: A Multicenter Observational Cohort Study in Japan. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Watanabe T, Kojima T, Takahashi N, Funahashi K, Asai S, Takemoto T, Asai N, Ishiguro N. AB1181 The Impact of Physical Function on Patient Global Assessment in Rheumatoid Arthritis. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.2018] [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: 11/03/2022]
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Asai S, Takahashi N, Funahashi K, Yoshioka Y, Takemoto T, Terabe K, Asai N, Ishiguro N, Kojima T. THU0078 Effects of Concomitant Methotrexate on the Long-Term Outcome of Knee Joint Destruction in Patients with Rheumatoid Arthritis Treated with Tumour Necrosis Factor Inhibitors. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1337] [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: 11/04/2022]
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Funahashi K, Kojima T, Takahashi N, Asai S, Yoshioka Y, Takemoto T, Terabe K, Asai N, Yabe Y, Ishiguro N. AB0466 The Outcome of Tocilizumab Treatment with Achievement of Glucocorticoids Withdrawal Against Rheumatoid Arthritis for 24 Months from TBC Registry. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.2587] [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: 11/03/2022]
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Kojima T, Takahashi N, Kaneko A, Kida D, Hirano Y, Fujibayashi T, Yabe Y, Takagi H, Oguchi T, Miyake H, Kato T, Watanabe T, Hayashi M, Shioura T, Kanayama Y, Funahashi K, Asai S, Yoshioka Y, Terabe K, Takemoto T, Asai N, Ishiguro N. AB0485 Predictive Factors for Achievement of Low Disease Activity or Remission at 52 Weeks in Switching from TNF Inhibitors to Abatacept with Background of low Dose or no Methotrexate: A Multicenter Observational Cohort Study in Japan. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1319] [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: 11/03/2022]
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Asai N, Yabe Y, Kojima T, Takahashi N, Funahashi K, Asai S, Takemoto T, Terabe K, Yoshioka Y, Ishiguro N. AB0476 Influence of the Reason for Discontinuation of Previous TNF Antagonists on the Retention of Tocilizumab. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5418] [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: 11/04/2022]
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Matsunuma R, Asai N, Ohkuni Y, Nakashima K, Iwasaki T, Misawa M, Norihiro K. I-ROAD could be efficient in predicting severity of community-acquired pneumonia or healthcare-associated pneumonia. Singapore Med J 2015; 55:318-24. [PMID: 25017407 DOI: 10.11622/smedj.2014082] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
INTRODUCTION The ability to predict the prognosis of patients with pneumonia is critical, especially when making decisions regarding treatment regimens and sites of care. However, prognostic guidelines for healthcare-associated pneumonia (HCAP) have yet to be established. I-ROAD is the prognostic guideline of the Japanese Respiratory Society for hospital-acquired pneumonia (HAP). This study compared available prognostic guidelines to determine the usefulness of I-ROAD as a prognostic tool for patients with HCAP. METHODS We conducted a retrospective review of all patients with pneumonia admitted to Kameda Medical Center, Japan, from January 2006 to September 2009. Patients were categorised into two groups, namely those with community acquired pneumonia (CAP) and those with HCAP. We compared the baseline characteristics, laboratory findings, identified pathogens, antibiotic regimens, clinical outcomes, pneumonic severity and prognostic accuracy of each guideline between the two patient groups. The severity of each disease was assessed on admission using the A-DROP, CURB-65, PSI and I-ROAD guidelines. RESULTS Of the 302 patients evaluated, 228 (75.5%) were diagnosed with CAP and 74 (24.5%) with HCAP. Patients with HCAP were older and had a higher performance status than patients with CAP. The mortality rate in the CAP group tended to rise with increasing severity scores of prognostic guidelines. Although the severity scores of all prognostic guidelines could predict 30-day mortality in patients with CAP, I-ROAD exhibited a higher discriminatory power for patients with HCAP based on analysis of receiver-operating characteristic curves. CONCLUSION I-ROAD could be more accurate than other prognostic guidelines for evaluating the severity of HCAP.
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Affiliation(s)
- R Matsunuma
- Department of Pulmonology, Kameda Medical Center, 929 Higashi-cho, Kamogawa City, Chiba Prefecture, Japan 296-8602.
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Kojima T, Yabe Y, Kaneko A, Takahashi N, Funahashi K, Kato D, Hanabayashi M, Asai S, Hirabara S, Asai N, Hirano Y, Hayashi M, Miyake H, Kojima M, Ishiguro N. Importance of methotrexate therapy concomitant with tocilizumab treatment in achieving better clinical outcomes for rheumatoid arthritis patients with high disease activity: an observational cohort study. Rheumatology (Oxford) 2014; 54:113-20. [DOI: 10.1093/rheumatology/keu302] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Asai N, Kojima T, Kaneko A, Yabe Y, Shioura T, Saito K, Kobayakawa T, Ishiguro N. AB0443 Influence of the Reason for Discontinuation of Previous TNF Antagonists on the Retention of Tocilizumab. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2299] [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: 11/04/2022]
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Kojima T, Takahashi N, Funahashi K, Kato D, Hattori Y, Hanabayashi M, Asai N, Ishiguro N. SAT0139 Importance of Concomitant MTX Use During Treatment with Tocilizumab in Patients with Rheumatoid Arthritis. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2013-eular.1865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Asai N, Ohkuni Y, Matsuda M, Kaneko N. Small-cell lung cancer with epidermal growth factor receptor mutation: Case report and review of literature. Indian J Cancer 2014; 51:384-385. [PMID: 25494153 DOI: 10.4103/0019-509x.146753] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- N Asai
- Department of Pulmonology, Kameda Medical Center, Chiba, Japan
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Yokoe N, Kubo A, Kosaka K, Hamanaka R, Matsubara A, Nishimura M, Tanaka H, Asai N, Takahashi A, Yamaguchi E. Interstitial Lung Disease (ILD) After Pleurodesis Against Malignant Pleural Effusion (MPE). Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.139] [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: 11/13/2022] Open
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Yabe Y, Kojima T, Kaneko A, Kanayama Y, Hirano Y, Shioura T, Saito K, Asai N, Kobayakawa T, Ishiguro N. AB0338 Evaluation of tocilizumab treatment continuation rate stratified by time of start of administration. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2660] [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: 11/04/2022]
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Asai N, Kobayakawa T, Saito K, Shioura T, Yabe Y, Kojima T, Kaneko A, Ishiguro N. AB0564 Continuation and remission rates of tocilizumab treatment based on improvement in patient global assessment: 2-year study based on the tsurumai biologics communication registry. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.564] [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: 11/04/2022]
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Yabe Y, Kojima T, Kaneko A, Kanayama Y, Hirano Y, Shioura T, Saito K, Asai N, Kobayakawa T, Ishiguro N. SAT0143 Analysis of Patients Who Obtained Remission by Disease Activity Score After Tocilizumab Treatment But Still had Low Disease Activity by Clinical Disease Activity Index, and Examination of Points for Treatment Intensification. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1869] [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: 11/04/2022]
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Yabe Y, Kojima T, Kaneko A, Kanayama Y, Shioura T, Asai N, Kobayakawa T, Saito K, Ishiguro N. AB0590 Rates of treatment continuation and remission in 97 patients with high c-reactive protein receiving tocilizumab: 2-year study based on the tsurumai biologics communication registry. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.590] [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: 11/04/2022]
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Asai N, Ohkuni Y, Matsunuma R, Nakashima K, Nakashita T, Otsuka Y, Kaneko N, Motojima S, Aoshima M. The predictive rule for the management of hospital-acquired pneumonia in adults by the Japanese Respiratory Society, I-ROAD, could correctly estimate the severity of Pneumcystis Pneumonia without human immunodeficiency virus infection. Int J Infect Dis 2012. [DOI: 10.1016/j.ijid.2012.05.358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Aoki N, Yokoyama R, Asai N, Ohki M, Ohki Y, Kusubata K, Heissig B, Hattori K, Nakagawa Y, Matsuda T. Adipocyte-derived microvesicles are associated with multiple angiogenic factors and induce angiogenesis in vivo and in vitro. Endocrinology 2010; 151:2567-76. [PMID: 20382694 DOI: 10.1210/en.2009-1023] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We previously reported that 3T3-L1 and rat primary adipocytes secreted microvesicles, known as adipocyte-derived microvesicles (ADMs). In the present study, we further characterized the 3T3-L1 ADMs and found that they exhibited angiogenic activity in vivo. Antibody arrays and gelatin zymography analyses revealed that several angiogenic and antiangiogenic proteins, including leptin, TNFalpha, acidic fibroblast growth factor (FGFa), interferon-gamma, and matrix metalloprotease (MMP)-2 and MMP-9, were present in the ADMs. Gene expression of most of these angiogenic factors was induced in the adipose tissue of diet-induced obese mice. Furthermore, leptin, TNFalpha, and MMP-2 were up-regulated at the protein level in the adipocyte fractions prepared from epididymal adipose tissues of high-fat-diet-induced obese mice. ADMs induced cell migration and tube formation of human umbilical vein endothelial cells, which were partially suppressed by neutralizing antibodies to leptin, TNFalpha, or FGFa but not to interferon-gamma. Supporting these data, a mixture of leptin, TNFalpha, and FGFa induced tube formation. ADMs also promoted cell invasion of human umbilical vein endothelial cells through Matrigel, which was suppressed by the addition of the MMP inhibitor 1,10'-phenanthroline and a neutralizing antibody to MMP-2 but not to MMP-9. These results suggest that ADMs are associated with multiple angiogenic factors and play a role in angiogenesis in adipose tissue.
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Affiliation(s)
- Naohito Aoki
- Department of Life Sciences, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu 514-8507, Japan.
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27
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Sato H, Abe T, Wakusawa R, Asai N, Kunikata H, Ohta H, Sonoda H, Sato Y, Nishida K. Vitreous levels of vasohibin-1 and vascular endothelial growth factor in patients with proliferative diabetic retinopathy. Diabetologia 2009; 52:359-61. [PMID: 19057892 DOI: 10.1007/s00125-008-1229-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2008] [Accepted: 11/04/2008] [Indexed: 11/24/2022]
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28
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Kusakabe Y, Tsunoda M, Tanaka N, Ohno S, Nakamura M, Senda T, Moriguchi T, Asai N, Sekine M, Yokogawa T, Nishikawa K, Nakamura K. Molecular basis for recognition of cognate tRNA by tyrosyl-tRNA synthetase from three kingdoms. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308090090] [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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29
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Hasegawa T, Enomoto A, Kato T, Kawai K, Miyamoto R, Jijiwa M, Ichihara M, Ishida M, Asai N, Murakumo Y, Ohara K, Niwa Y, Goto H, Takahashi M. Roles of induced expression of MAPK phosphatase-2 in tumor development in RET-MEN2A transgenic mice. Oncogene 2008; 27:5684-95. [DOI: 10.1038/onc.2008.182] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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30
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Aoki N, Jin-no S, Nakagawa Y, Asai N, Arakawa E, Tamura N, Tamura T, Matsuda T. Identification and characterization of microvesicles secreted by 3T3-L1 adipocytes: redox- and hormone-dependent induction of milk fat globule-epidermal growth factor 8-associated microvesicles. Endocrinology 2007; 148:3850-62. [PMID: 17478559 DOI: 10.1210/en.2006-1479] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Adipocytes are now recognized as endocrine cells secreting adipocytokines, regulating multiple metabolic pathways. In this study, we addressed secretion of microvesicles by 3T3-L1 adipocytes. We found that MFG-E8, one of the exosomal proteins, was present in the microvesicles and was distributed in the sucrose density fractions with 1.13-1.20 g/ml, which has been reported for exosomes. Several integral, cytosolic, and nuclear proteins such as caveolin-1, c-Src kinase, and heat shock protein 70 were also found to be microvesicle components. Unexpectedly, adiponectin was also substantially distributed in the microvesicle fractions. Furthermore, proteomic analysis of the microvesicles revealed that many other proteins such as extracellular matrix-related proteins were also present. Microvesicles secreted by 3T3-L1 adipocytes exhibited heterogeneity in size and comprised both smaller exosome-like and larger membrane vesicles as revealed by electron microscopy. Milk fat globule-epidermal growth factor 8 (MFG-E8)-associated adiposomes exhibited binding activity toward phosphatidylserine and apoptotic cells. MFG-E8 in the microvesicles was reduced when cultured in the low-glucose medium or cultured in the high-glucose medium with antioxidant N-acetyl cysteine. Insulin and TNF-alpha also up-regulated MFG-E8 in the microvesicles. Moreover, MFG-E8 was strongly up-regulated in the hypertrophic adipose tissue, predominantly in adipocyte fractions, of diet-induced obese C57BL/6 mice, where increased oxidative stress is induced. Thus, it is suggested that microvesicles, especially MFG-E8-associated ones, modulate adipose functions under redox- and hormone-dependent regulation. Based on the above findings, the adipocyte-derived microvesicles were named adiposomes.
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Affiliation(s)
- Naohito Aoki
- Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan.
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31
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Kuwano M, Kanda T, Shimizu K, Asai N, Kuwano M. [Health-related quality of life assessed by EuroQol in home care patients with stroke]. Nihon Ronen Igakkai Zasshi 2001; 38:831-3. [PMID: 11774734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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32
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Abstract
To confirm their structures and to assess the pheromonal activity, novel ceramides, possible sex pheromones of the hair crab Erimacrus isenbeckii, were synthesized from D-galactose. The synthetic ceramides were identical with the natural ceramides.
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Affiliation(s)
- N Asai
- Laboratory of Aquatic Natural Products Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
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33
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Iwashita T, Kurokawa K, Qiao S, Murakami H, Asai N, Kawai K, Hashimoto M, Watanabe T, Ichihara M, Takahashi M. Functional analysis of RET with Hirschsprung mutations affecting its kinase domain. Gastroenterology 2001; 121:24-33. [PMID: 11438491 DOI: 10.1053/gast.2001.25515] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND AIMS Many missense mutations in the RET proto-oncogene were found in familial and sporadic cases of Hirschsprung disease (HSCR). The aim of this study was to make clear the mechanisms of RET dysfunction by HSCR mutations identified in its kinase domain. METHODS Ten kinase domain HSCR mutations were introduced into wild-type RET and constitutively activated RET with a multiple endocrine neoplasia 2A mutation, and the resulting mutant complementary DNAs were transfected into SK-N-MC primitive neuroectodermal tumor cells or NIH 3T3 fibroblast cells. The levels of activation of mutant RET and representative signaling molecules were investigated in the transfectants. RESULTS E762Q, S767R, R972G, and M980T mutations partially impaired the RET kinase activity and the representative signaling pathways. In particular, these mutations severely impaired the phospholipase C-gamma signaling pathway in SK-N-MC cells. S765P, R873Q, F893L, R897Q, and E921K mutations resulted in a complete loss of the RET kinase activity. The P973L mutation markedly decreased the expression of the RET protein with normal kinase activity. CONCLUSIONS Hirschsprung disease can result from these distant functional classes of kinase domain mutation of RET.
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Affiliation(s)
- T Iwashita
- Department of Pathology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
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34
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Abstract
This paper reports the synthesis of nucleotide antibiotics having N-acyl phosphoramidate linkages. The key reaction, the construction of the N-acyl phosphoramidate linkage was achieved by the reaction of nucleoside 5'-phosphoramidite derivatives with carboxamide derivatives in the presence of 5-(3,5-dinitrophenyl)-1H-tetrazole as a very effective activator. By use of this activator, Phosmidosine was synthesized by condensation of an appropriately protected 8-oxoadenosine 5'-O-phosphoramidite derivative with an N-protected prolinamide derivative. In the case of Agrocin 84, the two P-N bonds were constructed progressively. The N-acyl phosphoramidate linkage at the 5'-position of the ribose moiety was similarly synthesized. After phosphorylation of the amino group of the adenine moiety, a fully protected Agrocin 84 derivative, which would be converted to Agrocin 84, was successfully synthesized.
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Affiliation(s)
- T Moriguchi
- Department of Life Science, Tokyo Institute of Technology, Yokohama, Japan
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35
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Yoshida S, Shibata M, Yamamoto S, Hagihara M, Asai N, Takahashi M, Mizutani S, Muramatsu T, Kadomatsu K. Homo-oligomer formation by basigin, an immunoglobulin superfamily member, via its N-terminal immunoglobulin domain. Eur J Biochem 2000; 267:4372-80. [PMID: 10880960 DOI: 10.1046/j.1432-1327.2000.01482.x] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Basigin (Bsg) is a highly glycosylated transmembrane protein with two immunoglobulin (Ig)-like domains. A number of studies, including gene targeting, have demonstrated that Bsg plays pivotal roles in spermatogenesis, implantation, neural network formation and tumor progression. In the present study, to understand the mechanism of action of Bsg, we determined its expression status on the plasma membrane. Cotransfection of Bsg expression vectors with two different tags clarified that Bsg forms homo-oligomers in a cis-dependent manner on the plasma membrane. If the disulfide bond of the more N-terminally located Ig-like domain was destroyed by mutations, Bsg could not form oligomers. In contrast, the mutations of the C-terminal Ig-like domain or N-glycosylation sites did not affect the association. The association of mouse and human Bsgs, which exhibit high homology in the transmembrane and intracellular domains but low homology in the extracellular domain, was very weak as compared with that within the same species, suggesting the importance of the extracellular domain in the association. If the extracellular domain of the human Ret protein was replaced with the N-terminal Ig-like domain of Bsg, the resulting chimera protein was associated with intact wild-type Bsg, but not if the C-terminal Ig-like domain, instead of the N-terminal one, of Bsg was used. No oligomer formation took place between the intact wild-type Ret and Bsg proteins. In conclusion, these data indicate that the N-terminal Ig-like domain is necessary and sufficient for oligomer formation by Bsg on the plasma membrane.
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MESH Headings
- Animals
- Antigens, CD
- Antigens, Neoplasm
- Antigens, Surface/chemistry
- Avian Proteins
- Basigin
- Biotinylation
- Blood Proteins
- Blotting, Western
- COS Cells
- Cell Membrane/metabolism
- DNA, Complementary/metabolism
- Disulfides
- Electrophoresis, Polyacrylamide Gel
- Glycosylation
- Humans
- Immunoglobulins/chemistry
- Male
- Membrane Glycoproteins/biosynthesis
- Membrane Glycoproteins/chemistry
- Membrane Glycoproteins/genetics
- Mice
- Mice, Inbred C57BL
- Models, Biological
- Mutagenesis, Site-Directed
- Mutation
- Plasmids/metabolism
- Precipitin Tests
- Protein Structure, Tertiary
- Recombinant Fusion Proteins/metabolism
- Testis/metabolism
- Transfection
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Affiliation(s)
- S Yoshida
- Departments of Biochemistry, Obstetrics and Gynecology, and Pathology, Nagoya University School of Medicine, Japan
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36
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Vuddhakul V, Patararungrong N, Pungrasamee P, Jitsurong S, Morigaki T, Asai N, Nishibuchi M. Isolation and characterization of Escherichia coli O157 from retail beef and bovine feces in Thailand. FEMS Microbiol Lett 2000; 182:343-7. [PMID: 10620690 DOI: 10.1111/j.1574-6968.2000.tb08919.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Antibody to Escherichia coli O157 lipopolysaccharide was detected in the sera of healthy individuals more frequently in Southern Thailand than in Japan. The result suggested possible exposure of Thai people to E. coli O157. E. coli O157:H7 or O157:H(-) was isolated from four of 95 retail beef and one of 55 bovine feces samples collected in Southern Thailand by enrichment culture followed by immunomagnetic bead separation. Four of the five strains carried the stx(2) gene alone or in combination with the stx(1) gene. The strains were shown to be genetically distinct by an arbitrarily primed PCR method.
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Affiliation(s)
- V Vuddhakul
- Department of Microbiology, Faculty of Science, Prince of Songkla University, Hat-yai, Thailand
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37
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Kato M, Iwashita T, Takeda K, Akhand AA, Liu W, Yoshihara M, Asai N, Suzuki H, Takahashi M, Nakashima I. Ultraviolet light induces redox reaction-mediated dimerization and superactivation of oncogenic Ret tyrosine kinases. Mol Biol Cell 2000; 11:93-101. [PMID: 10637293 PMCID: PMC14759 DOI: 10.1091/mbc.11.1.93] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.0] [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: 11/11/2022] Open
Abstract
The c-RET proto-oncogene encodes a receptor-type tyrosine kinase, and its mutations in the germ line are responsible for the inheritance of multiple endocrine neoplasia type 2A (MEN2A) and 2B (MEN2B). Ret kinases are constitutively activated as a result of MEN2A mutations (Ret-MEN2A) or MEN2B mutations (Ret-MEN2B). Here we demonstrate that UV light (UV) irradiation induces superactivation of the constitutively activated Ret-MEN2A and Ret-MEN2B as well as activation of c-Ret. Before UV irradiation, small percentages of c-Ret (3-4%) and Ret-MEN2B (1-2%) and large percentages of Ret-MEN2A (30-40%) were dimerized through disulfide bonds. These dimerized Ret proteins were preferentially autophosphorylated, suggesting a close relation between up-regulated kinase activity and disulfide bond-mediated dimerization of Ret proteins. We found that UV irradiation promotes the disulfide bond-mediated dimerization of the Ret proteins, in close association with activation and superactivation of Ret kinases. UV irradiation also induced dimerization and activation of the extracellular domain-deleted mutant Ret (Ret-PTC-1). Interestingly, the levels of basic kinase activity and dimerization of Ret-PTC-1-C376A, in which cysteine 376 in the tyrosine kinase domain of Ret-PTC-1 was replaced by alanine, were low and were not increased by UV irradiation. These results suggest that Ret-PTC-1 cysteine 376 is one of possibly multiple critical target amino acids of UV for Ret kinase activation. Overexpression of Cu/Zn superoxide dismutase in cells as a result of gene transfection prevented both the UV-mediated promotion of dimerization and the superactivation of Ret-MEN2A kinase. These results suggest that the UV-induced free radicals in cells attack intracellular domains of Ret to dimerize the kinase proteins for superactivation.
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Affiliation(s)
- M Kato
- Department of Immunology, Nagoya University School of Medicine, Nagoya, Aichi 466-8550, Japan
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38
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Oho E, Asai N, Itoh S. Image quality improvement using helium gas in low voltage variable pressure scanning electron microscopy. J Electron Microsc (Tokyo) 2000; 49:761-763. [PMID: 11270857 DOI: 10.1093/oxfordjournals.jmicro.a023869] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An effective combination of the low voltage and variable pressure (VP) scanning electron microscopy (SEM) are discussed. In low voltage VP-SEM, helium gas is utilized for reducing the amount of scatter of the primary electron beam. Most samples can receive various benefits obtained from the combination of low voltage and low vacuum observation. Compared to a back-scattered electron (BSE) image in air, signal-to-noise ratio (SNR) of a BSE image taken with helium gas is 5.4 times under a pressure of 50 Pa and an accelerating voltage of 1.5 kV.
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39
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Asai N, Nakajima N, Tamaoki M, Kamada H, Kondo N. Role of malate synthesis mediated by phosphoenolpyruvate carboxylase in guard cells in the regulation of stomatal movement. Plant Cell Physiol 2000; 41:10-5. [PMID: 10750703 DOI: 10.1093/pcp/41.1.10] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
To clarify the pathway and role of malate synthesis in guard cells, epidermal strips isolated from Vicia faba L. leaflets were treated with 3,3-dichloro-2-dihydroxyphosphinoylmethyl-2-propenoate (DCDP), a specific inhibitor of phosphoenolpyruvate carboxylase (PEPC). When dark-closed stomata were illuminated, malate accumulated in guard cells and stomata opened; these were inhibited by 60% and 30%, respectively, by 5 mM DCDP treatment. When light-opened stomata were treated with DCDP, both malate level in guard cells and stomatal aperture decreased. Treatment with 5 mM DCDP partially inhibited CO2 incorporation into malate in guard cells. Treatment with mannitol at 0.4 M (osmotic stress) in the light increased malate level in guard cells and closed stomata. DCDP treatment decreased both malate level and stomatal aperture under stressed condition. These results show that malate synthesis in the light under both non-stressed and stressed conditions is dependent on PEPC activity. The extent of the decrease in malate level by DCDP treatment was larger under stressed condition than under nonstressed condition, suggesting that osmotic stress may enhance the activity of this pathway of malate synthesis which is induced by light. Role of malate synthesis in guard cells is discussed.
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Affiliation(s)
- N Asai
- Department of Biological Sciences, University of Tsukuba, Japan
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40
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Takeuchi H, Asai N, Tanabe K, Kozaki T, Fujita M, Sakai T, Okuda A, Naruse N, Yamamoto S, Sameshima T, Heida N, Dobashi K, Baba M. EM2487, a novel anti-HIV-1 antibiotic, produced by Streptomyces sp. Mer-2487: taxonomy, fermentation, biological properties, isolation and structure elucidation. J Antibiot (Tokyo) 1999; 52:971-82. [PMID: 10656569 DOI: 10.7164/antibiotics.52.971] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the purpose of discovering novel agents that inhibit HIV-1 replication at the transcriptional level, we have established cell lines reflecting the HIV-1 long terminal repeat-driven gene expression. Using these cell lines, we have screened approximately 10,000 microorganism products and found that the culture supernatant of Streptomyces sp. Mer-2487 suppresses the HIV-1 Tat-induced gene expression without affecting the basal or tumor necrosis factor-alpha-induced transcription. The purified active component has a unique structure, as shown in Fig. 1. This compound has an inhibitory effect on HIV-1 replication in chronically infected cells as well as acutely infected cells, suggesting that the inhibition occurs at a postintegration step of HIV-1 proviral DNA in the HIV-1 replication cycle.
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Affiliation(s)
- H Takeuchi
- Tsukuba Research Laboratories, Eisai Co., Ltd., Ibaraki, Japan
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41
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Tezel G, Nagasaka T, Iwahashi N, Asai N, Iwashita T, Sakata K, Takahashi M. Different nuclear/cytoplasmic distributions of RET finger protein in different cell types. Pathol Int 1999; 49:881-6. [PMID: 10571821 DOI: 10.1046/j.1440-1827.1999.00957.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The RET finger protein (RFP), which belongs to the B box zinc finger protein family, has a tripartite motif consisting of a Ring finger, a B box finger and a coiled-coil domain. The RET finger protein becomes oncogenic when its tripartite motif is fused with the tyrosine kinase domain of the RET protein. This study examined the RFP expression in normal and tumor tissues by immunohistochemistry. RFP was detected in the nuclei of various cells, including peripheral and central neurones, hepatocytes, adrenal chromaffin cells and male germ cells. Among them, RFP was expressed at high levels in male germ cells such as primary spermatocytes and round spermatids, and formed a perinuclear cap structure in primary spermatocytes. On the other hand, high levels of cytoplasmic expression of RFP were observed in some plasma cells as well as solitary plasmacytoma and multiple myeloma. These results suggested that different nuclear/cytoplasmic distributions of RFP might play a role in the regulation of growth or differentiation of different cell types.
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Affiliation(s)
- G Tezel
- Department of Pathology, Nagoya University School of Medicine, Japan
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42
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Ishiguro Y, Iwashita T, Murakami H, Asai N, Iida K, Goto H, Hayakawa T, Takahashi M. The role of amino acids surrounding tyrosine 1062 in ret in specific binding of the shc phosphotyrosine-binding domain. Endocrinology 1999; 140:3992-8. [PMID: 10465268 DOI: 10.1210/endo.140.9.7003] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We investigated the role of the I-E-N-K-L (amino acids 1057-1061) sequence amino-terminal to Tyr1062 in Ret for binding of the Shc phosphotyrosine-binding (PTB) domain. Substitution of Ser for Ile1057 (I1057S), Ala for Asn1059 (N1059A), or Pro for Leu1061 (L1061P) in this sequence significantly decreased the transforming activity of Ret with the multiple endocrine neoplasm type 2A (MEN2A) mutation as well as the binding affinity of Shc to it in vivo and in vitro, indicating that these three amino acids play a role in Shc binding. In addition, as the RET protooncogene is translated as three isoforms of 1114 amino acids (Ret 51), 1106 amino acids (Ret 43), and 1072 amino acids (Ret 9) that differ from one another in the sequence carboxyl-terminal to Tyr1062, we examined whether these sequence differences influence the binding affinity of Shc to Ret. As a result, we found that the transforming activity of Ret 43 isoform with the MEN2A mutation and the binding affinity of Shc to it were very low, although the consensus sequence for the binding of the Shc PTB domain is conserved in the Ret 43 isoform. This finding suggested that the sequence carboxyl-terminal to Tyr1062 in Ret could also influence the binding affinity to Shc.
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Affiliation(s)
- Y Ishiguro
- Department of Pathology, Nagoya University School of Medicine, Japan
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43
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Murakami H, Iwashita T, Asai N, Shimono Y, Iwata Y, Kawai K, Takahashi M. Enhanced phosphatidylinositol 3-kinase activity and high phosphorylation state of its downstream signalling molecules mediated by ret with the MEN 2B mutation. Biochem Biophys Res Commun 1999; 262:68-75. [PMID: 10448070 DOI: 10.1006/bbrc.1999.1186] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [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: 11/22/2022]
Abstract
We compared the intracellular signalling pathways through Ret tyrosine kinase activated by glial cell line-derived neurotrophic factor (GDNF), multiple endocrine neoplasia (MEN) 2A, or MEN 2B mutation. Tyrosine phosphorylation of Grb2-associated binder-1 (Gab1) and activation of phosphatidylinositol 3-kinase (PI 3-kinase) were induced at higher levels by GDNF stimulation or the MEN 2B mutation than by the MEN 2A mutation. Tyrosine-phosphorylated Gab1 was a major component that interacted with the active PI 3-kinase in vivo. In addition, we found that p62Dok and PKB/Akt were phosphorylated in a PI 3-kinase-dependent manner and the levels of their phosphorylation were significantly higher in the MEN 2B transfectant than in the MEN 2A transfectant. Tyrosine phosphorylation of p62Dok resulted in its complex formation with the Ras GTPase-activating protein (RasGAP) and the Nck adaptor protein. These findings thus suggested that high levels of activation of PI 3-kinase and of phosphorylation of its downstream signalling molecules may be associated with the clinical phenotype of MEN 2B.
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Affiliation(s)
- H Murakami
- Department of Pathology, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
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44
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Iwata Y, Nakayama A, Murakami H, Iida K, Iwashita T, Asai N, Takahashi M. Characterization of the promoter region of the human RFP gene. Biochem Biophys Res Commun 1999; 261:381-4. [PMID: 10425194 DOI: 10.1006/bbrc.1999.1037] [Citation(s) in RCA: 8] [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] [Indexed: 11/22/2022]
Abstract
The RFP gene encodes a Ring finger protein that has a tripartite motif consisting of a Ring finger, a B-box finger and a coiled-coil domain. In the present study, we cloned and characterized the promoter region of the human RFP gene. The nucleotide sequence of the promoter was GC-rich and had no typical TATA and CAAT boxes. Instead, it contained one AP2 and two Sp1 binding sites within 100 base pairs upstream of the transcription initiation site. Analysis by the luciferase assay revealed that the activity of this promoter region is very strong in both human and mouse cell lines, although the activity in human cells was approximately 10-15 fold higher than that in mouse cells. In addition, the AP2 and Sp1 binding sites appeared to synergistically function for the promoter activity. Thus, the promoter of the RFP gene could be useful for high levels of expression of various genes in culture cells.
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Affiliation(s)
- Y Iwata
- Department of Pathology, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
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45
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Iwashita T, Kato M, Murakami H, Asai N, Ishiguro Y, Ito S, Iwata Y, Kawai K, Asai M, Kurokawa K, Kajita H, Takahashi M. Biological and biochemical properties of Ret with kinase domain mutations identified in multiple endocrine neoplasia type 2B and familial medullary thyroid carcinoma. Oncogene 1999; 18:3919-22. [PMID: 10445857 DOI: 10.1038/sj.onc.1202742] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Several mutations were identified in the kinase domain of the RET proto-oncogene in patients with multiple endocrine neoplasia (MEN) 2B, familial medullary thyroid carcinoma (FMTC) or sporadic medullary thyroid carcinoma. We introduced seven mutations (glutamic acid 768-->aspartic acid (E768D), valine 804-->leucine (V804L), alanine 883-->phenylalanine (A883F), serine 891-->alanine (S891A), methionine 918-->threonine (M918T), alanine 919-->proline (A919P) and E768D/A919P) into the short and long isoforms of RET cDNA and transfected the mutant cDNAs into NIH3T3 cells. The transforming activity of the long isoform of Ret with each mutation was much higher that that of its short isoform. Based on the levels of the transforming activity, these mutant RET genes were classified into two groups; a group with high transforming activity (A883F, M918T and E768D/A919P) and a group with low transforming activity (E768D, V804L, S891A and A919P) (designated high group and low group). Interestingly, the level of transforming activity correlated with clinical phenotypes; high group Ret with the A883F or M918T mutation and low group Ret with the E768D, V804L or S891A mutation were associated with the development of MEN 2B and FMTC, respectively. In addition, we found that substitution of phenylalanine for tyrosine 905 present in the kinase domain abolished both transforming and autophosphorylation activities of low group Ret whereas it did not affect the activities of high group Ret.
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Affiliation(s)
- T Iwashita
- Department of Pathology, Nagoya University School of Medicine, Japan
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Nakayama S, Iida K, Tsuzuki T, Iwashita T, Murakami H, Asai N, Iwata Y, Ichihara M, Ito S, Kawai K, Asai M, Kurokawa K, Takahashi M. Implication of expression of GDNF/Ret signalling components in differentiation of bone marrow haemopoietic cells. Br J Haematol 1999; 105:50-7. [PMID: 10233362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Glial cell line-derived neurotrophic factor (GDNF) and neurturin (NTN) mediate their actions through a unique multicomponent receptor system composed of Ret receptor tyrosine kinase and glycosyl-phosphatidylinositol-linked cell surface proteins (designated GFRalpha-1 and GFRalpha-2). In the present study, expression of these signalling components in the process of differentiation of haemopoietic cells was investigated. Ret was expressed at variable levels in normal and malignant cells of the myelomonocyte lineage. Immunohistochemical analysis of human and mouse tissues revealed that Ret expression was increased in intermediate mature myeloid cells such as promyelocytes and myelocytes and decreased in mature granulocytes and monocytes. Consistent with this observation, when THP-1 monocytic and HL-60 promyelocytic leukaemia cells expressing Ret were differentiated toward macrophages or granulocytes by treatment of 12-O-tetradecanoylphorbol-13-acetate (TPA) or all-trans retinoic acid (RA), Ret expression strikingly decreased during differentiation. Expression of GDNF, NTN, GFRalpha-1 and GFRalpha-2 was undetectable in THP-1 and HL-60 cells as well as in bone marrow haemopoietic cells. In contrast, bone marrow stromal cells appeared to express GDNF, GFRalpha-1 and GFRalpha-2 but not Ret. These findings suggested that the interaction between stromal cells and Ret-expressing haemopoietic cells in the bone marrow microenvironment may play a role in the differentiation of myelomonocyte-lineage cells through activation of the GDNF/Ret signalling pathway.
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Affiliation(s)
- S Nakayama
- Department of Pathology, Nagoya University School of Medicine, Showa-ku, Nagoya, Japan
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Murakami H, Iwashita T, Asai N, Iwata Y, Narumiya S, Takahashi M. Rho-dependent and -independent tyrosine phosphorylation of focal adhesion kinase, paxillin and p130Cas mediated by Ret kinase. Oncogene 1999; 18:1975-82. [PMID: 10208419 DOI: 10.1038/sj.onc.1202514] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Glial cell line-derived neurotrophic factor (GDNF) signals through a unique receptor system that includes Ret receptor tyrosine kinase and a glycosyl-phosphatidylinositol-linked cell surface protein. In the present study, we have identified several proteins in neuroblastoma cells that are phosphorylated on tyrosine in response to GDNF. The phosphorylated proteins include focal adhesion kinase (FAK), paxillin and Crk-associated substrate, p130Cas, all of which are known to be associated with focal adhesions. Of these, paxillin and p130Cas interacted with Crk proteins in GDNF-treated neuroblastoma cells. GDNF also induced reorganization of the actin cytoskelton. Tyrosine phosphorylation of FAK, paxillin and p130Cas was inhibited by cytochalasin D or two specific inhibitors of phosphatidylinositol-3' kinase (PI-3' kinase), wortmannin and LY294002, indicating that their tyrosine phosphorylation depends on the formation of actin stress fiber and activation of PI-3' kinase. In addition, phosphorylation of FAK but not of paxillin and p130Cas was markedly impaired by the Clostridium botulinum C3 exoenzyme that specifically ADP-ribosylates and inactivates Rho. These results suggested the presence of Rho-dependent and -independent signaling pathways downstream of PI-3' kinase that mediate tyrosine phosphorylation of FAK, paxillin and p130Cas through Ret kinase.
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Affiliation(s)
- H Murakami
- Department of Pathology, Nagoya University School of Medicine, Japan
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Asai N, Iwashita T, Murakami H, Takanari H, Ohmori K, Ichihara M, Takahashi M. Mechanism of Ret activation by a mutation at aspartic acid 631 identified in sporadic pheochromocytoma. Biochem Biophys Res Commun 1999; 255:587-90. [PMID: 10049754 DOI: 10.1006/bbrc.1999.0237] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mutations at aspartic acid 631 in Ret were reported in sporadic pheochromocytoma and medullary thyroid carcinoma. We replaced this aspartic acid with four other amino acids including tyrosine, glycine, asparagine, and alanine and investigated the transforming activity of these mutant cDNAs. Among them, RET cDNA with a mutation of aspartic acid to tyrosine (D631Y) that was reported in sporadic pheochromocytoma showed high transforming activity. The D631Y mutation activated Ret by inducing its disulfide-linked dimerization in the transfectant as observed for multiple endocrine neoplasia (MEN) 2A mutations at cysteine 609, 611, 618, 620, 630, or 634. Further mutation analysis suggested that cysteine 630 or 634 could be involved in the disulfide-linked Ret dimerization induced by the D631Y mutation.
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Affiliation(s)
- N Asai
- Department of Pathology, Nagoya University School of Medicine, 65 Tsurumai-cho, Nagoya, Showa-ku, 466-8550, Japan
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Takahashi M, Asai N, Iwashita T, Murakami H, Ito S. Mechanisms of development of multiple endocrine neoplasia type 2 and Hirschsprung's disease by ret mutations. Recent Results Cancer Res 1999; 154:229-36. [PMID: 10027003 DOI: 10.1007/978-3-642-46870-4_14] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
The ret proto-oncogene encodes a receptor tyrosine kinase whose ligands belong to the glial cell line-derived neurotrophic factor (GDNF) protein family. Its germline mutations are responsible for the development of multiple endocrine neoplasia (MEN) types 2A and 2B and Hirschsprung's disease (HSCR). MEN2A and MEN2B mutations result in the constitutive activation of Ret by different molecular mechanisms. MEN2A mutations involve cysteine residues present in the Ret extracellular domain and induce disulfide-linked Ret dimerization on the cell surface. MEN2B mutations were identified in methionine 918 in the tyrosine kinase domain and activate Ret without dimerization, probably due to a conformational change of its catalytic core region. In contrast to MEN2 mutations, HSCR mutations represent loss of function mutations. We found that most of HSCR mutations detected in the extracellular domain impair the Ret cell surface expression. More interestingly, ret mutations in cysteines 618 and 620 were reported in several families who developed both MEN2A and HSCR. It was suggested that these mutations might have two biological effects on Ret function, leading to the development of different clinical phenotypes in the same patients.
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Affiliation(s)
- M Takahashi
- Department of Pathology, Nagoya University School of Medicine, Japan
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Asai M, Kato M, Asai N, Iwashita T, Murakami H, Kawai K, Nakashima I, Takahashi M. Differential regulation of MMP-9 and TIMP-2 expression in malignant melanoma developed in metallothionein/RET transgenic mice. Jpn J Cancer Res 1999; 90:86-92. [PMID: 10076570 PMCID: PMC5925989 DOI: 10.1111/j.1349-7006.1999.tb00670.x] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
We recently established a metallothionein-I(MT)/RET transgenic mouse line in which skin melanosis, benign melanocytic tumor and malignant melanoma develop stepwise. Malignant melanoma cells but not benign melanocytic tumor cells had metastatic ability in transgenic mice. In the present study, we investigated the expression of several matrix metalloproteinases (MMPs) and tissue inhibitors of matrix metalloproteinases (TIMPs), including MMP-1, MMP-2, MMP-3, MMP-7, MMP-9, MT1-MMP, TIMP-1 and TIMP-2, in these tumors. Western and northern blot analyses revealed that malignant transformation of melanocytic tumors developed in MT/RET transgenic mice accompanied with upregulation of MMP-9 and downregulation of TIMP-2. Expression of other MMP and TIMP genes examined was very low or undetectable in both benign and malignant tumors. Since activation of MMP-9 in malignant tumors was detected by gelatin zymography, these results suggest that imbalance of expression of the MMP-9 and TIMP-2 genes might be associated with metastatic ability of melanoma cells developed in MT/RET transgenic mice.
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Affiliation(s)
- M Asai
- Department of Pathology, Nagoya University School of Medicine
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