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Sato Y, Takita A, Suzue K, Hashimoto Y, Hiramoto S, Murakami M, Tomita H, Hirakawa H. TusDCB, a sulfur transferase complex involved in tRNA modification, contributes to UPEC pathogenicity. Sci Rep 2024; 14:8978. [PMID: 38637685 PMCID: PMC11026471 DOI: 10.1038/s41598-024-59614-2] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 04/12/2024] [Indexed: 04/20/2024] Open
Abstract
tRNA modifications play a crucial role in ensuring accurate codon recognition and optimizing translation levels. While the significance of these modifications in eukaryotic cells for maintaining cellular homeostasis and physiological functions is well-established, their physiological roles in bacterial cells, particularly in pathogenesis, remain relatively unexplored. The TusDCB protein complex, conserved in γ-proteobacteria like Escherichia coli, is involved in sulfur modification of specific tRNAs. This study focused on the role of TusDCB in the virulence of uropathogenic E. coli (UPEC), a bacterium causing urinary tract infections. The findings indicate that TusDCB is essential for optimal production of UPEC's virulence factors, including type 1 fimbriae and flagellum, impacting the bacterium's ability to aggregate in bladder epithelial cells. Deletion of tusDCB resulted in decreased virulence against urinary tract infection mice. Moreover, mutant TusDCB lacking sulfur transfer activity and tusE- and mnmA mutants revealed the indispensability of TusDCB's sulfur transfer activity for UPEC pathogenicity. The study extends its relevance to highly pathogenic, multidrug-resistant strains, where tusDCB deletion reduced virulence-associated bacterial aggregation. These insights not only deepen our understanding of the interplay between tRNA sulfur modification and bacterial pathogenesis but also highlight TusDCB as a potential therapeutic target against UPEC strains resistant to conventional antimicrobial agents.
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Affiliation(s)
- Yumika Sato
- Department of Bacteriology, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Ayako Takita
- Department of Bacteriology, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Kazutomo Suzue
- Department of Infectious Diseases and Host Defense, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Yusuke Hashimoto
- Department of Bacteriology, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Suguru Hiramoto
- Department of Clinical Laboratory Medicine, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
| | - Haruyoshi Tomita
- Department of Bacteriology, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
- Laboratory of Bacterial Drug Resistance, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi Maebashi, Gunma, 371-8511, Japan
| | - Hidetada Hirakawa
- Department of Bacteriology, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan.
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Hirakawa H, Takita A, Sato Y, Hiramoto S, Hashimoto Y, Ohshima N, Minamishima YA, Murakami M, Tomita H. Inactivation of ackA and pta Genes Reduces GlpT Expression and Susceptibility to Fosfomycin in Escherichia coli. Microbiol Spectr 2023; 11:e0506922. [PMID: 37199605 PMCID: PMC10269713 DOI: 10.1128/spectrum.05069-22] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 04/29/2023] [Indexed: 05/19/2023] Open
Abstract
Fosfomycin is used to treat a variety of bacterial infections, including urinary tract infections caused by Escherichia coli. In recent years, quinolone-resistant and extended-spectrum β-lactamase (ESBL)-producing bacteria have been increasing. Because fosfomycin is effective against many of these drug-resistant bacteria, the clinical importance of fosfomycin is increasing. Against this background, information on the mechanisms of resistance and the antimicrobial activity of this drug is desired to enhance the usefulness of fosfomycin therapy. In this study, we aimed to explore novel factors affecting the antimicrobial activity of fosfomycin. Here, we found that ackA and pta contribute to fosfomycin activity against E. coli. ackA and pta mutant E. coli had reduced fosfomycin uptake capacity and became less sensitive to this drug. In addition, ackA and pta mutants had decreased expression of glpT that encodes one of the fosfomycin transporters. Expression of glpT is enhanced by a nucleoid-associated protein, Fis. We found that mutations in ackA and pta also caused a decrease in fis expression. Thus, we interpret the decrease in glpT expression in ackA and pta defective strains to be due to a decrease in Fis levels in these mutants. Furthermore, ackA and pta are conserved in multidrug-resistant E. coli isolated from patients with pyelonephritis and enterohemorrhagic E. coli, and deletion of ackA and pta from these strains resulted in decreased susceptibility to fosfomycin. These results suggest that ackA and pta in E. coli contribute to fosfomycin activity and that mutation of these genes may pose a risk of reducing the effect of fosfomycin. IMPORTANCE The spread of drug-resistant bacteria is a major threat in the field of medicine. Although fosfomycin is an old type of antimicrobial agent, it has recently come back into the limelight because of its effectiveness against many drug-resistant bacteria, including quinolone-resistant and ESBL-producing bacteria. Since fosfomycin is taken up into the bacteria by GlpT and UhpT transporters, its antimicrobial activity fluctuates with changes in GlpT and UhpT function and expression. In this study, we found that inactivation of the ackA and pta genes responsible for the acetic acid metabolism system reduced GlpT expression and fosfomycin activity. In other words, this study shows a new genetic mutation that leads to fosfomycin resistance in bacteria. The results of this study will lead to further understanding of the mechanism of fosfomycin resistance and the creation of new ideas to enhance fosfomycin therapy.
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Affiliation(s)
- Hidetada Hirakawa
- Department of Bacteriology, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Ayako Takita
- Department of Bacteriology, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Yumika Sato
- Department of Bacteriology, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Suguru Hiramoto
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Yusuke Hashimoto
- Department of Bacteriology, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Noriyasu Ohshima
- Department of Biochemistry, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Yoji A. Minamishima
- Department of Biochemistry, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Haruyoshi Tomita
- Department of Bacteriology, Gunma University Graduate School of Medicine, Gunma, Japan
- Laboratory of Bacterial Drug Resistance, Gunma University Graduate School of Medicine, Gunma, Japan
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Hiramoto S, Kikuchi A, Oya K, Sakashita A, Ito S, Ito T. 1279P Changes in vital signs of end-of-life patients with advanced cancer: A prospective cohort study. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1412] [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: 11/01/2022] Open
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4
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Matsumoto T, Hiramoto S, Niwa T, Machida H, Suto C, Takahashi M. First description of a clinical glutamine-dependent Escherichia coli with a missense mutation in the glnA. J Infect Chemother 2022; 28:1513-1518. [DOI: 10.1016/j.jiac.2022.07.022] [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] [Received: 04/21/2022] [Revised: 07/13/2022] [Accepted: 07/28/2022] [Indexed: 10/31/2022]
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Hiramoto S, Miyashita D, Kimura T, Niwa T, Uchida A, Sano M, Murata M, Nagasawa T, Tsunekawa K, Aoki T, Yoshida A, Kato T, Yanagisawa K, Tokue Y, Murakami M. Serological Screening of Immunoglobulin G against SARS-CoV-2 Nucleocapsid and Spike Protein before and after Two Vaccine Doses among Healthcare Workers in Japan. TOHOKU J EXP MED 2022; 257:57-64. [PMID: 35354694 DOI: 10.1620/tjem.2022.j017] [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: 11/18/2022]
Affiliation(s)
- Suguru Hiramoto
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Daichi Miyashita
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Takao Kimura
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Takahiko Niwa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Azusa Uchida
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Maika Sano
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Mai Murata
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Takumi Nagasawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Katsuhiko Tsunekawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Tomoyuki Aoki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Akihiro Yoshida
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
| | - Toshimitsu Kato
- Infection Control and Prevention Center, Gunma University Hospital
| | - Kunio Yanagisawa
- Infection Control and Prevention Center, Gunma University Hospital
| | - Yutaka Tokue
- Infection Control and Prevention Center, Gunma University Hospital
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine.,Clinical Laboratory Center, Gunma University Hospital
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Hiramoto S, Tokutani R. 1464P Clinical factors associated with survival time from the last administration of systemic anticancer therapy to death in patients with advanced cancer. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.229] [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: 11/27/2022] Open
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7
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Nagasawa T, Kimura T, Yoshida A, Tsunekawa K, Araki O, Ushiki K, Ishigaki H, Shoho Y, Suda I, Hiramoto S, Murakami M. Konjac Glucomannan Attenuated Triglyceride Metabolism during Rice Gruel Tolerance Test. Nutrients 2021; 13:nu13072191. [PMID: 34202167 PMCID: PMC8308303 DOI: 10.3390/nu13072191] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/16/2021] [Accepted: 06/22/2021] [Indexed: 11/21/2022] Open
Abstract
In a recent study, we showed that konjac glucomannan (KGM) inhibits rice gruel-induced postprandial increases in plasma glucose and insulin levels. To extend this research, we investigated the effects of KGM addition to rice gruel on pre- and postprandial concentrations of circulating lipoprotein lipase (LPL), glycosylphosphatidylinositol-anchored high-density lipoprotein-binding protein 1 (GPIHBP1), hepatic triglyceride lipase (HTGL), free fatty acids (FFA), and triglycerides (TG). A total of 13 Japanese men, without diabetes, dyslipidemia, or gastrointestinal diseases, interchangeably ingested rice gruel containing no KGM (0%G), rice gruel supplemented with 0.4% KGM (0.4%G), and rice gruel supplemented with 0.8% KGM (0.8%G), every Sunday for 3 weeks. Blood samples were obtained at baseline and at 30, 60, and 120 min after ingestion to measure the abovementioned lipid parameters. Lipid parameters showed small, but significant, changes. Significant reductions were found in circulating FFA levels among all participants. Circulating TG levels significantly declined at 30 min and then remained nearly constant in the 0.8%G group but exhibited no significant difference in the 0%G and 0.4%G groups. Although circulating levels of LPL and GPIHBP1 significantly decreased in the 0%G and 0.4%G groups, they increased at 120 min in the 0.8%G group. Participants in the 0%G and 0.4%G groups showed significant decreases in circulating HTGL levels, which was not observed in the 0.8%G group. Our results demonstrate the novel pleiotropic effects of KGM. Supplementation of rice gruel with KGM powder led to TG reduction accompanied by LPL and GPIHBP1 elevation and HTGL stabilization, thereby attenuating TG metabolism.
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Affiliation(s)
- Takumi Nagasawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
| | - Takao Kimura
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
- Center for Food Science and Wellness, Gunma University, Aramaki-machi 4-2, Meabshi 371-8510, Gunma, Japan
- Correspondence: ; Tel.: +81-27-220-8576; Fax: +81-27-220-8583
| | - Akihiro Yoshida
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
- Center for Food Science and Wellness, Gunma University, Aramaki-machi 4-2, Meabshi 371-8510, Gunma, Japan
| | - Katsuhiko Tsunekawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
- Center for Food Science and Wellness, Gunma University, Aramaki-machi 4-2, Meabshi 371-8510, Gunma, Japan
| | - Osamu Araki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
| | - Kazumi Ushiki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
| | - Hirotaka Ishigaki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
| | - Yoshifumi Shoho
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
| | - Itsumi Suda
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
| | - Suguru Hiramoto
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan; (T.N.); (A.Y.); (K.T.); (O.A.); (K.U.); (H.I.); (Y.S.); (I.S.); (S.H.); (M.M.)
- Clinical Laboratory Center, Gunma University Hospital, Showa-machi 3-39-22, Meabshi 371-8511, Gunma, Japan
- Center for Food Science and Wellness, Gunma University, Aramaki-machi 4-2, Meabshi 371-8510, Gunma, Japan
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Hiramoto S, Taniyama T, Kikuchi A, Hori T, Yoshioka A, Inoue A. 1520P Effect of molecular targeting agents and immune-checkpoint inhibitors use near the end of life patients with advanced cancer. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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9
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Yoshida A, Kimura T, Tsunekawa K, Araki O, Ushiki K, Ishigaki H, Shoho Y, Suda I, Hiramoto S, Murakami M. Glucomannan Inhibits Rice Gruel-Induced Increases in Plasma Glucose and Insulin Levels. Ann Nutr Metab 2020; 76:259-267. [PMID: 32659777 DOI: 10.1159/000508674] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 05/08/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Given the association between diabetes suppression and inhibition of diet-induced elevation in glucose and insulin, we investigated the effects of adding glucomannan to rice gruel on pre- and postprandial glucose and insulin concentrations. METHODS A total of 25 Japanese subjects without a history of diabetes or gastrointestinal disease (all males; aged 37-60 years; body mass index 20.4-31.6) participated in this study. Subjects received a 75-g oral glucose tolerance test (75gOGTT) and rice gruel containing 0, 0.4, or 0.8% of glucomannan. Blood samples were then obtained at preload and at 30, 60, and 120 min after receiving 75 g of glucose or rice gruel with or without glucomannan. RESULTS After the 75gOGTT, 8 subjects had normal glucose tolerance (NGT), whereas 17 showed a borderline pattern. Moreover, our data showed that greater amounts of glucomannan promoted lesser 30-min postload plasma glucose and insulin levels, with differences being larger in the borderline group than in the NGT group. CONCLUSIONS Glucomannan dose-dependently inhibited the rice gruel-induced increase in 30-min postprandial plasma glucose and insulin levels. Furthermore, greater inhibitory effects on glucose and insulin elevation were observed in the borderline group than in the NGT group.
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Affiliation(s)
- Akihiro Yoshida
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Gunma University Center for Food Science and Wellness, Maebashi, Japan
| | - Takao Kimura
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan, .,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan, .,Gunma University Center for Food Science and Wellness, Maebashi, Japan,
| | - Katsuhiko Tsunekawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan.,Gunma University Center for Food Science and Wellness, Maebashi, Japan
| | - Osamu Araki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan
| | - Kazumi Ushiki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan
| | - Hirotaka Ishigaki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Yoshifumi Shoho
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Itsumi Suda
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan
| | - Suguru Hiramoto
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan.,Clinical Laboratory Center, Gunma University Hospital, Maebashi, Japan.,Gunma University Center for Food Science and Wellness, Maebashi, Japan
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10
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Hiramoto S, Nagashima K, Hori T, Kikuchi A, Yoshioka A. Association between prognosis and discontinuation by image diagnosis for advanced gastrointestinal cancer patients who received end-of-life chemotherapy. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz155.014] [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: 11/12/2022] Open
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11
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Hiramoto S, Kikuchi A, Hori T, Yoshioka A, Nagashima K. Associations between primary cancer site, metastatic site, comorbidity, and details of symptoms and treatment in advanced gastrointestinal cancer patients at end-of-life. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz155.013] [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: 11/12/2022] Open
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12
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Hiramoto S, Kikuch A, Hori T, Yoshioka A, Tamaki T. Prognostic impact of end-of-life chemotherapy in the last weeks for patients with advanced cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy295.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Hiramoto S, Kikuchi A, Yoshioka A, Maeda I. 1506 Efficacy of palliative radiotherapy and chemoradiotherapy for localized bleeding and obstruction caused by unresectable gastric cancer. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30596-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Kuroda K, Miyahara H, Ye M, Eremeev SV, Koroteev YM, Krasovskii EE, Chulkov EV, Hiramoto S, Moriyoshi C, Kuroiwa Y, Miyamoto K, Okuda T, Arita M, Shimada K, Namatame H, Taniguchi M, Ueda Y, Kimura A. Experimental verification of PbBi2Te4 as a 3D topological insulator. Phys Rev Lett 2012; 108:206803. [PMID: 23003165 DOI: 10.1103/physrevlett.108.206803] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Indexed: 06/01/2023]
Abstract
The experimental evidence is presented of the topological insulator state in PbBi2Te4. A single surface Dirac cone is observed by angle-resolved photoemission spectroscopy with synchrotron radiation. Topological invariants Z2 are calculated from the ab initio band structure to be 1;(111). The observed two-dimensional isoenergy contours in the bulk energy gap are found to be the largest among the known three-dimensional topological insulators. This opens a pathway to achieving a sufficiently large spin current density in future spintronic devices.
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Affiliation(s)
- K Kuroda
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
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15
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Yanai M, Suzuki M, Kawamura K, Oshida N, Hiramoto S, Yasuda O, Shingai A, Suguro T. Synthesis of N-4909 analogs. Part I. A stimulant of apolipoprotein E secretion in human hepatoma G2 cells. J Antibiot (Tokyo) 2000; 53:1385-96. [PMID: 11217804 DOI: 10.7164/antibiotics.53.1385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Analogs of N-4909 (1), which had a stimulating activity for apolipoprotein E (apo E) secretion in Human hepatoma Hep G2 cells, were prepared and their activities examined. Cyclic analogs which had different kinds of amino acids or different number of amino acids from N-4909 (1) showed less effect on apo E secretion from Hep G2 cells. The length of acyl chain was found to be an important factor for the activity. Shorter chain reduced the activity. Linear analogs were also prepared. One of their analogs, N-5849 (17), which had six amino acids was found to have strong activity.
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Affiliation(s)
- M Yanai
- Pharmaceutical Research Laboratories, Nisshin Flour Milling Co, Ltd, Iruma-gun, Saitama, Japan
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16
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Takahashi T, Hiramoto S, Wato S, Nishimoto T, Wada Y, Nagai K, Yamaguchi H. Identification of essential amino acid residues of an alpha-amylase inhibitor from Phaseolus vulgaris white kidney beans. J Biochem 1999; 126:838-44. [PMID: 10544275 DOI: 10.1093/oxfordjournals.jbchem.a022524] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Kidney bean (Phaseolus vulgaris) alpha-amylase inhibitors, which are bivalent inhibitors with the subunit stoichiometry of (alphabeta)(2) complex, have been inferred to contain unique arginine, tryptophan, and tyrosine residues essential for the inhibitory activity. To test the validity of this inference, an attempt was made to identify the essential amino acid residues of a white kidney bean (P. vulgaris) alpha-amylase inhibitor (PHA-I) by using the chemical modification technique combined with amino acid sequencing and mass spectrometry. Exhaustive modification of the arginine residues by phenylglyoxal did not lead to a marked loss of activity, suggesting that no arginine residue is directly associated with the inhibitory activity. N-Bromosuccinimide treatment of PHA-I in the presence or absence of a substrate alpha-amylase revealed the involvement of two tryptophan residues in alpha-amylase inhibition, and they were identified as Trp188 of the beta-subunit by amino acid sequencing and mass spectrometry of lysylendopeptidase peptides. Further, two tyrosine residues were preferentially modified either by N-acetylimidazole or by tetranitromethane, resulting in a concomitant loss of most of the PHA-I activity. Amino acid sequencing of the lysylendopeptidase peptides from a tetranitromethane-modified PHA-I identified Tyr186 of the beta-subunit as an essential residue.
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Affiliation(s)
- T Takahashi
- Department of Applied Biological Chemistry, College of Agriculture, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
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17
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Okamura N, Kiuchi S, Tamba M, Kashima T, Hiramoto S, Baba T, Dacheux F, Dacheux JL, Sugita Y, Jin YZ. A porcine homolog of the major secretory protein of human epididymis, HE1, specifically binds cholesterol. Biochim Biophys Acta 1999; 1438:377-87. [PMID: 10366780 DOI: 10.1016/s1388-1981(99)00070-0] [Citation(s) in RCA: 148] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A porcine homolog of the major secretory protein of human epididymis, HE1, was for the first time purified from the porcine cauda epididymal fluid. The HE1 homolog was secreted into the epididymal fluid as a 19-kDa glycoprotein, whose sugar moiety was gradually processed to form a 16-kDa protein during transit through the epididymis. The HE1 homolog mRNA was detected only in the caput and corpus epididymis among the porcine tissues examined. The purified HE1 homolog specifically bound cholesterol with high affinity (Kd=2. 3 microM). The binding stoichiometry was determined to be 0.94 mol/mol, suggesting that 1 mol of cholesterol binds to 1 mol of the protein. It was also found that the HE1 homolog is a major cholesterol-binding protein in the porcine epididymal fluid. The possibility that the HE1 homolog is involved in the regulation of the lipid composition of the sperm membranes during the maturation in epididymis is discussed.
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Affiliation(s)
- N Okamura
- Institute of Basic Medical Sciences, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.
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18
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Yanai M, Hiramoto S. First total synthesis of N-4909 and its diastereomer; a stimulant of apolipoprotein E secretion in human hepatoma Hep G2 cells. J Antibiot (Tokyo) 1999; 52:150-9. [PMID: 10344569 DOI: 10.7164/antibiotics.52.150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Both (R)- and (S)-3-hydroxy-13-methyltetradecanoic acids were prepared via a lipase-catalyzed enantioselective acylation. The total synthesis of N-4909 and its diastereomer were achieved by a coupling of either (R)- or (S)-3-hydroxy-13-methyltetradecanoic acid moiety with a hexapeptide moiety and by a cyclization with HATU (O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate) and HOAt (1-hydroxy-7-azabenzotriazole) in a high dilution condition. The R configuration of 3-hydroxy-13-methyltetradecanoic acid was found to be important for stimulating the activity of apolipoprotein E secretion in human hepatoma Hep G2 cells.
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Affiliation(s)
- M Yanai
- 1st Pharmaceutical Laboratory, Pharmaceutical Research Laboratories, Nisshin Flour Milling Co., Ltd., Saitama, Japan
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19
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Hiramoto S, Tamba M, Kiuchi S, Jin YZ, Bannai S, Sugita Y, Dacheux F, Dacheux JL, Yoshida M, Okamura N. Stage-specific expression of a mouse homologue of the porcine 135kDa alpha-D-mannosidase (MAN2B2) in type A spermatogonia. Biochem Biophys Res Commun 1997; 241:439-45. [PMID: 9425289 DOI: 10.1006/bbrc.1997.7768] [Citation(s) in RCA: 12] [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: 02/05/2023]
Abstract
The cDNA encoding a mouse homologue of porcine epididymis-specific 135kDa alpha-D-mannosidase (MAN2B2, D28521) was cloned from the mouse testis cDNA library. It was found that 1018 amino acids were coded in its open reading frame, and 62% of the amino acid sequence was identical to that of porcine MAN2B2. In the adult mouse, testis contained higher amounts of mRNA encoding the MAN2B2 homologue than the epididymis, though porcine MAN2B2 was mainly expressed in the narrow region between the caput and corpus epididymis. mRNA of the mouse MAN2B2 homologue was localized exclusively in spermatogonia in the testis. It was specifically expressed in type A spermatogonia at stages IX-XI of spermatogenesis and was detected there until the cell developed into type B spermatogonia. We conclude that the expression of the MAN2B2 homologue can serve as a good marker for the late stages of type A spermatogonia and may have an important role to play in the early step of spermatogenesis in mice.
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Affiliation(s)
- S Hiramoto
- Institute of Basic Medical Sciences, University of Tsukuba, Ibaraki, Japan
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20
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Okamura N, Iwaki Y, Hiramoto S, Tamba M, Bannai S, Sugita Y, Syntin P, Dacheux F, Dacheux JL. Molecular cloning and characterization of the epididymis-specific glutathione peroxidase-like protein secreted in the porcine epididymal fluid. Biochim Biophys Acta 1997; 1336:99-109. [PMID: 9271255 DOI: 10.1016/s0304-4165(97)00016-0] [Citation(s) in RCA: 38] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The epididymis-specific glutathione peroxidase was purified from the porcine cauda epididymal fluid in order to analyze its enzymatic activity and roles in the epididymis. The purified protein was found to consist of four identical 23 kDa subunits. The complementary DNA encoding the 23 kDa subunit was cloned from the cDNA library of the porcine proximal caput epididymis, only where the 23 kDa subunit is expressed. Although the selenocysteine codon (TGA) is contained in the cDNA of the other cytosolic type of glutathione peroxidases, it is replaced by cysteine codon (TGT) in the 23 kDa subunit cDNA, similarly to the results previously obtained for cDNAs encoding the epididymis-specific form of the secreted glutathione peroxidases of mouse, rat and monkey. By the direct analysis of the selenium, the purified protein was proved to contain no selenium atom in the molecule. The activities of the purified epididymis-specific glutathione peroxidase toward hydrogen peroxide or organic hydroperoxides were by far lower than the activity of cytosolic selenium-dependent glutathione peroxidase (less than 0.1%). In addition, the concentration of glutathione in the porcine epididymal fluids was about 20 microM, which is much lower than the optimal concentration for the glutathione peroxidase activity of the purified protein. These results strongly suggest that this protein is enzymatically quiescent at least in the porcine epididymal fluid. An immunocytochemical study showed that this protein was found to bind to the acrosomal region of the epididymal sperm and to disappear during the acrosome reaction. Furthermore, this protein significantly retarded the acrosome reaction induced in vitro. The possibilities have been discussed that it protects sperm from the premature acrosome reaction and maintains sperm fertilizing ability in the epididymis.
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Affiliation(s)
- N Okamura
- Institute of Basic Medical Sciences, University of Tsukuba, Ibaraki, Japan.
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21
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Hiramoto S, Kinoshita N, Hatanaka S, Seto H. Stimulation of apolipoprotein E secretion in human hepatoma Hep G2 cells by a cyclic acylpeptide, N-4909. J Antibiot (Tokyo) 1996; 49:949-52. [PMID: 8931734 DOI: 10.7164/antibiotics.49.949] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
MESH Headings
- Animals
- Apolipoproteins/drug effects
- Apolipoproteins/metabolism
- Apolipoproteins E/drug effects
- Apolipoproteins E/metabolism
- Bacillus/chemistry
- Bacillus/metabolism
- Carcinoma, Hepatocellular/drug therapy
- Carcinoma, Hepatocellular/metabolism
- Carcinoma, Hepatocellular/pathology
- Cholesterol/blood
- Humans
- Hypolipidemic Agents/chemistry
- Hypolipidemic Agents/pharmacology
- Male
- Molecular Structure
- Peptides, Cyclic/chemistry
- Peptides, Cyclic/metabolism
- Peptides, Cyclic/pharmacology
- Protein Synthesis Inhibitors/chemistry
- Protein Synthesis Inhibitors/pharmacology
- Rats
- Rats, Sprague-Dawley
- Spectrometry, Mass, Fast Atom Bombardment
- Tumor Cells, Cultured
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22
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Ichikawa-Haraguchi M, Sumizawa T, Yoshimura A, Furukawa T, Hiramoto S, Sugita M, Akiyama S. Progesterone and its metabolites: the potent inhibitors of the transporting activity of P-glycoprotein in the adrenal gland. Biochim Biophys Acta 1993; 1158:201-8. [PMID: 7902738 DOI: 10.1016/0304-4165(93)90016-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
P-glycoprotein (P-gp) is a transmembrane glycoprotein responsible for the multidrug resistant (MDR) phenotype in various cancer cells. It has been shown that P-gp transports various kinds of anti-cancer agents as well as hydrophobic chemicals. Although P-gp is also expressed in normal human tissues, such as liver, kidney, and adrenal gland, its function and transporting substrates in these tissues are still unknown. In previous work, we demonstrated that some compounds in human plasma modulate the transporting activity of P-gp. We also found that P-gp is expressed at a high level in the bovine adrenal gland and that this tissue contains large amount of compounds which inhibit the transporting activity of P-gp. We purified such compounds from the adrenal gland by monitoring the ability to enhance the accumulation of [3H]vincristine in MDR cells. Two major compounds were purified and identified as progesterone and pregnenolone by nuclear magnetic resonance (NMR) analysis. Progesterone was the most potent and abundant compound that inhibited the transporting activity of P-gp among the compounds extracted from bovine adrenal gland with methanol. We also found that six authentic progesterone metabolites in the 5 beta-metabolic pathway but none in the 5 alpha-metabolic pathway were able to enhance the accumulation of [3H]vincristine in MDR cells and to inhibit [3H]azidopine photolabeling of P-gp in the adrenal gland. These results indicate that some progesterone metabolites can interact with P-gp and that stereoisomerism around carbon 5 of the progesterone metabolites is important for them to be recognized by P-gp.
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Hiramoto S, Sugita M, Ando C, Sasaki T, Furihata K, Seto H, Otake N. Studies on mycotrienin antibiotics, a novel class of ansamycins. V. Isolation and structure determination of novel mycotrienin congeners. J Antibiot (Tokyo) 1985; 38:1103-6. [PMID: 4044410 DOI: 10.7164/antibiotics.38.1103] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Sugita M, Hiramoto S, Ando C, Sasaki T, Furihata K, Seto H, Otake N. Studies on mycotrienin antibiotics, a novel class of ansamycins. IV. Microbial conversion of mycotrienin-II to mycotrienol-II, 34-hydroxymycotrienin-II and 22-O-beta-D-glucopyranosylmycotrienin-II by Bacillus megaterium. J Antibiot (Tokyo) 1985; 38:799-802. [PMID: 3926737 DOI: 10.7164/antibiotics.38.799] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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25
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Fukushima H, Hiramoto S, Nagira Y. Efficiency of cranial irradiation and prednisolone toward Hand-Schüller-Christian disease: report of a case. Yonago Acta Med 1977; 21:44-7. [PMID: 614735] [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: 12/23/2022]
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