1
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Mure A, Sugiura Y, Maeda R, Honda K, Sakurai N, Takahashi Y, Watada M, Katoh T, Gotoh A, Gotoh Y, Taniguchi I, Nakamura K, Hayashi T, Katayama T, Uemura T, Hattori Y. Identification of key yeast species and microbe-microbe interactions impacting larval growth of Drosophila in the wild. eLife 2023; 12:RP90148. [PMID: 38150375 PMCID: PMC10752588 DOI: 10.7554/elife.90148] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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] [Indexed: 12/29/2023] Open
Abstract
Microbiota consisting of various fungi and bacteria have a significant impact on the physiological functions of the host. However, it is unclear which species are essential to this impact and how they affect the host. This study analyzed and isolated microbes from natural food sources of Drosophila larvae, and investigated their functions. Hanseniaspora uvarum is the predominant yeast responsible for larval growth in the earlier stage of fermentation. As fermentation progresses, Acetobacter orientalis emerges as the key bacterium responsible for larval growth, although yeasts and lactic acid bacteria must coexist along with the bacterium to stabilize this host-bacterial association. By providing nutrients to the larvae in an accessible form, the microbiota contributes to the upregulation of various genes that function in larval cell growth and metabolism. Thus, this study elucidates the key microbial species that support animal growth under microbial transition.
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Affiliation(s)
- Ayumi Mure
- Graduate School of Biostudies, Kyoto UniversityKyotoJapan
| | - Yuki Sugiura
- Center for Cancer Immunotherapy and Immunobiology, Kyoto UniversityKyotoJapan
| | - Rae Maeda
- Center for Cancer Immunotherapy and Immunobiology, Kyoto UniversityKyotoJapan
| | - Kohei Honda
- Graduate School of Biostudies, Kyoto UniversityKyotoJapan
| | | | | | - Masayoshi Watada
- Graduate School of Science and Engineering, Ehime UniversityMatsuyamaJapan
| | | | - Aina Gotoh
- Graduate School of Biostudies, Kyoto UniversityKyotoJapan
| | - Yasuhiro Gotoh
- Graduate School of Medical Sciences, Kyushu UniversityFukuokaJapan
| | - Itsuki Taniguchi
- Graduate School of Medical Sciences, Kyushu UniversityFukuokaJapan
| | - Keiji Nakamura
- Graduate School of Medical Sciences, Kyushu UniversityFukuokaJapan
| | - Tetsuya Hayashi
- Graduate School of Medical Sciences, Kyushu UniversityFukuokaJapan
| | | | - Tadashi Uemura
- Graduate School of Biostudies, Kyoto UniversityKyotoJapan
- Center for Living Systems Information Science, Kyoto UniversityKyotoJapan
- AMED-CRESTTokyoJapan
| | - Yukako Hattori
- Graduate School of Biostudies, Kyoto UniversityKyotoJapan
- Center for Living Systems Information Science, Kyoto UniversityKyotoJapan
- JST FORESTTokyoJapan
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2
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Gotoh A, Hidaka M, Sakurama H, Nishimoto M, Kitaoka M, Sakanaka M, Fushinobu S, Katayama T. Substrate recognition mode of a glycoside hydrolase family 42 β-galactosidase from Bifidobacterium longum subspecies infantis ( BiBga42A) revealed by crystallographic and mutational analyses. Microbiome Res Rep 2023; 2:20. [PMID: 38046823 PMCID: PMC10688820 DOI: 10.20517/mrr.2023.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/02/2023] [Accepted: 05/09/2023] [Indexed: 12/05/2023]
Abstract
Aim: Bifidobacterium longum subsp. infantis uses a glycoside hydrolase (GH) family 42 β-galactosidase (BiBga42A) for hydrolyzing lacto-N-tetraose (LNT), which is the most abundant core structure of human milk oligosaccharides (HMOs). As such, BiBga42A represents one of the pivotal enzymes underpinning the symbiosis between bifidobacteria and breastfed infants. Despite its importance, the structural basis underlying LNT hydrolysis by BiBga42A is not understood. Moreover, no substrate-complexed structures are available to date for GH42 family members. Methods: X-ray crystallography was used to determine the structures of BiBga42A in the apo- and liganded forms. The roles of the amino acid residues that were presumed to be involved in catalysis and substrate recognition were examined by a mutational study, in which kinetic parameters of each mutant were determined using 4-nitrophenyl-β-D-galactoside, lacto-N-biose I, LNT, and lacto-N-neotetraose (LNnT) as substrates. Conservation of those amino acid residues was examined among structure-determined GH42 β-galactosidases. Results: Crystal structures of the wild-type enzyme complexed with glycerol, the E160A/E318A double mutant complexed with galactose (Gal), and the E318S mutant complexed with LNT were determined at 1.7, 1.9, and 2.2 Å resolutions, respectively. The LNT molecule (excluding the Gal moiety at subsite +2) bound to the E318S mutant is recognized by an extensive hydrogen bond network and several hydrophobic interactions. The non-reducing end Gal moiety of LNT adopts a slightly distorted conformation and does not overlap well with the Gal molecule bound to the E160A/E318A mutant. Twelve of the sixteen amino acid residues responsible for LNT recognition and catalysis in BiBga42A are conserved among all homologs including β-1,6-1,3-galactosidase (BlGal42A) from Bifidobacterium animalis subsp. lactis. Conclusion: BlGal42A is active on 3-β-galactobiose similarly to BiBga42A but is inactive on LNT. Interestingly, we found that the entrance of the catalytic pocket of BlGal42A is narrower than that of BiBga42A and seems not easily accessible from the solvent side due to the presence of two bulky amino acid side chains. The specificity difference may reflect the structural difference between the two enzymes.
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Affiliation(s)
- Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Masafumi Hidaka
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572, Japan
| | - Haruko Sakurama
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Mamoru Nishimoto
- Institute of Food Research, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8642, Japan
| | - Motomitsu Kitaoka
- Institute of Food Research, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8642, Japan
- Faculty of Agriculture, Niigata University, Niigata 950-2102, Japan
| | - Mikiyasu Sakanaka
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shinya Fushinobu
- Department of Biotechnology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
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3
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Sen A, Nishimura T, Yoshimoto S, Yoshida K, Gotoh A, Katoh T, Yoneda Y, Hashimoto T, Xiao JZ, Katayama T, Odamaki T. Comprehensive analysis of metabolites produced by co-cultivation of Bifidobacterium breve MCC1274 with human iPS-derived intestinal epithelial cells. Front Microbiol 2023; 14:1155438. [PMID: 37125172 PMCID: PMC10133457 DOI: 10.3389/fmicb.2023.1155438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 03/23/2023] [Indexed: 05/02/2023] Open
Abstract
Examining how host cells affect metabolic behaviors of probiotics is pivotal to better understand the mechanisms underlying the probiotic efficacy in vivo. However, studies to elucidate the interaction between probiotics and host cells, such as intestinal epithelial cells, remain limited. Therefore, in this study, we performed a comprehensive metabolome analysis of a co-culture containing Bifidobacterium breve MCC1274 and induced pluripotent stem cells (iPS)-derived small intestinal-like cells. In the co-culture, we observed a significant increase in several amino acid metabolites, including indole-3-lactic acid (ILA) and phenyllactic acid (PLA). In accordance with the metabolic shift, the expression of genes involved in ILA synthesis, such as transaminase and tryptophan synthesis-related genes, was also elevated in B. breve MCC1274 cells. ILA production was enhanced in the presence of purines, which were possibly produced by intestinal epithelial cells (IECs). These findings suggest a synergistic action of probiotics and IECs, which may represent a molecular basis of host-probiotic interaction in vivo.
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Affiliation(s)
- Akira Sen
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
- *Correspondence: Akira Sen,
| | - Tatsuki Nishimura
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Shin Yoshimoto
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Keisuke Yoshida
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Aina Gotoh
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Toshihiko Katoh
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Yasuko Yoneda
- Technology Research Laboratory, Shimadzu Corp., Kyoto, Japan
| | | | - Jin-Zhong Xiao
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Takane Katayama
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Toshitaka Odamaki
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
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4
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Sugiyama Y, Mori Y, Nara M, Kotani Y, Nagai E, Kawada H, Kitamura M, Hirano R, Shimokawa H, Nakagawa A, Minami H, Gotoh A, Sakanaka M, Iida N, Koyanagi T, Katayama T, Okamoto S, Kurihara S. Gut bacterial aromatic amine production: aromatic amino acid decarboxylase and its effects on peripheral serotonin production. Gut Microbes 2022; 14:2128605. [PMID: 36217238 PMCID: PMC9553188 DOI: 10.1080/19490976.2022.2128605] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Colonic luminal aromatic amines have been historically considered to be derived from dietary source, especially fermented foods; however, recent studies indicate that the gut microbiota serves as an alternative source of these amines. Herein, we show that five prominent genera of Firmicutes (Blautia, Clostridium, Enterococcus, Ruminococcus, and Tyzzerella) have the ability to abundantly produce aromatic amines through the action of aromatic amino acid decarboxylase (AADC). In vitro cultivation of human fecal samples revealed that a significant positive correlation between aadc copy number of Ruminococcus gnavus and phenylethylamine (PEA) production. Furthermore, using genetically engineered Enterococcus faecalis-colonized BALB/cCrSlc mouse model, we showed that the gut bacterial aadc stimulates the production of colonic serotonin, which is reportedly involved in osteoporosis and irritable bowel syndrome. Finally, we showed that human AADC inhibitors carbidopa and benserazide inhibit PEA production in En. faecalis.
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Affiliation(s)
- Yuta Sugiyama
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan,Gunma University Center for Food Science and Wellness, Gunma University, Maebashi, Japan
| | - Yumiko Mori
- Department of Clinical Laboratory Sciences, Faculty of Health Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Misaki Nara
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan
| | - Yusuke Kotani
- Department of Clinical Laboratory Sciences, Faculty of Health Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Emiko Nagai
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan,Department of Biotechnology, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo-ku, Japan
| | - Hiroki Kawada
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan
| | - Mayu Kitamura
- Department of Clinical Laboratory Sciences, Faculty of Health Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Rika Hirano
- Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Japan
| | - Hiromi Shimokawa
- Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Japan
| | - Akira Nakagawa
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan
| | - Hiromichi Minami
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Mikiyasu Sakanaka
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan
| | - Noriho Iida
- Department of Gastroenterology, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
| | - Takashi Koyanagi
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan
| | - Takane Katayama
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan,Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Shigefumi Okamoto
- Department of Clinical Laboratory Sciences, Faculty of Health Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kanazawa, Japan,Advanced Health Care Science Research Unit, Innovative Integrated Bio-Research Core, Institute for Frontier Science Initiative, Kanazawa University, Kanazawa, Japan
| | - Shin Kurihara
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, 921-8836, Japan,Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Japan,CONTACT Shin Kurihara Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama649-6493, Japan
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5
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Yakabe K, Higashi S, Akiyama M, Mori H, Murakami T, Toyoda A, Sugiyama Y, Kishino S, Okano K, Hirayama A, Gotoh A, Li S, Mori T, Katayama T, Ogawa J, Fukuda S, Hase K, Kim YG. Dietary-protein sources modulate host susceptibility to Clostridioides difficile infection through the gut microbiota. Cell Rep 2022; 40:111332. [PMID: 36103838 DOI: 10.1016/j.celrep.2022.111332] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 07/12/2022] [Accepted: 08/17/2022] [Indexed: 11/27/2022] Open
Abstract
Clostridioides difficile causes nosocomial antibiotic-associated diarrhea on a global scale. Susceptibility to C. difficile infection (CDI) is influenced by the composition and metabolism of gut microbiota, which in turn are affected by diet. However, the mechanism underlying the interplay between diet and gut microbiota that modulates susceptibility to CDI remains unclear. Here, we show that a soy protein diet increases the mortality of antibiotic-treated, C. difficile-infected mice while also enhancing the intestinal levels of amino acids (aas) and relative abundance of Lactobacillus genus. Indeed, Ligilactobacillus murinus-mediated fermentation of soy protein results in the generation of aas, thereby promoting C. difficile growth, and the process involves the anchored cell wall proteinase PrtP. Thus, mutual interaction between dietary protein and the gut microbiota is a critical factor affecting host susceptibility to CDI, suggesting that dietary protein sources can be an important determinant in controlling the disease.
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Affiliation(s)
- Kyosuke Yakabe
- Research Center for Drug Discovery, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Tokyo 105-8512, Japan; Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Tokyo 105-8512, Japan
| | | | - Masahiro Akiyama
- Research Center for Drug Discovery, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Tokyo 105-8512, Japan
| | - Hiroshi Mori
- Advanced Genomics Center, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
| | - Takumi Murakami
- Advanced Genomics Center, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
| | - Atsushi Toyoda
- Advanced Genomics Center, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
| | - Yuta Sugiyama
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Shigenobu Kishino
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Kenji Okano
- Department of Life Science and Biotechnology, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan; International Center for Biotechnology, Osaka University, Osaka 565-0871, Japan
| | - Akiyoshi Hirayama
- Institute for Advanced Biosciences, Keio University, Yamagata 997-0052, Japan
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
| | - Shunyi Li
- Graduate School of Systems Life Sciences, Kyushu University, Fukuoka 819-0395, Japan
| | - Takeshi Mori
- Graduate School of Systems Life Sciences, Kyushu University, Fukuoka 819-0395, Japan
| | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
| | - Jun Ogawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Shinji Fukuda
- Institute for Advanced Biosciences, Keio University, Yamagata 997-0052, Japan; Transborder Medical Research Center, University of Tsukuba, Ibaraki 305-8575, Japan; Gut Environmental Design Group, Kanagawa Institute of Industrial Science and Technology, Kanagawa 210-0821, Japan; Laboratory for Regenerative Microbiology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Koji Hase
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Tokyo 105-8512, Japan; The Institute of Fermentation Sciences (IFeS), Faculty of Food and Agricultural Sciences, Fukushima University, Kanayagawa, Fukushima 960-1296, Japan; International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo (IMSUT), Tokyo 108-8639, Japan
| | - Yun-Gi Kim
- Research Center for Drug Discovery, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Tokyo 105-8512, Japan.
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6
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Ojima MN, Jiang L, Arzamasov AA, Yoshida K, Odamaki T, Xiao J, Nakajima A, Kitaoka M, Hirose J, Urashima T, Katoh T, Gotoh A, van Sinderen D, Rodionov DA, Osterman AL, Sakanaka M, Katayama T. Priority effects shape the structure of infant-type Bifidobacterium communities on human milk oligosaccharides. ISME J 2022; 16:2265-2279. [PMID: 35768643 PMCID: PMC9381805 DOI: 10.1038/s41396-022-01270-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [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] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 06/05/2022] [Accepted: 06/09/2022] [Indexed: 11/10/2022]
Abstract
Bifidobacteria are among the first colonizers of the infant gut, and human milk oligosaccharides (HMOs) in breastmilk are instrumental for the formation of a bifidobacteria-rich microbiota. However, little is known about the assembly of bifidobacterial communities. Here, by applying assembly theory to a community of four representative infant-gut associated Bifidobacterium species that employ varied strategies for HMO consumption, we show that arrival order and sugar consumption phenotypes significantly affected community formation. Bifidobacterium bifidum and Bifidobacterium longum subsp. infantis, two avid HMO consumers, dominate through inhibitory priority effects. On the other hand, Bifidobacterium breve, a species with limited HMO-utilization ability, can benefit from facilitative priority effects and dominates by utilizing fucose, an HMO degradant not utilized by the other bifidobacterial species. Analysis of publicly available breastfed infant faecal metagenome data showed that the observed trends for B. breve were consistent with our in vitro data, suggesting that priority effects may have contributed to its dominance. Our study highlights the importance and history dependency of initial community assembly and its implications for the maturation trajectory of the infant gut microbiota.
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Affiliation(s)
- Miriam N Ojima
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
| | - Lin Jiang
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | | | - Keisuke Yoshida
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Toshitaka Odamaki
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Jinzhong Xiao
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan
| | - Aruto Nakajima
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | | | - Junko Hirose
- School of Human Cultures, The University of Shiga Prefecture, Hikone, Shiga, Japan
- Department of Food and Nutrition, Kyoto Women's University, Kyoto, Japan
| | - Tadasu Urashima
- Department of Food and Life Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan
| | - Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Douwe van Sinderen
- APC Microbiome Ireland and School of Microbiology, Food Science Building, University College Cork, Cork, Ireland
| | - Dmitry A Rodionov
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Andrei L Osterman
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | | | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
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7
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Nakajima A, Yoshida K, Gotoh A, Katoh T, Ojima MN, Sakanaka M, Xiao JZ, Odamaki T, Katayama T. A simple method that enhances minority species detection in the microbiota: 16S metagenome-DRIP (Deeper Resolution using an Inhibitory Primer). Microbiome Res Rep 2022; 1:20. [PMID: 38046362 PMCID: PMC10688780 DOI: 10.20517/mrr.2022.08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/27/2022] [Accepted: 05/10/2022] [Indexed: 12/05/2023]
Abstract
Aim: 16S rRNA gene-based microbiota analyses (16S metagenomes) using next-generation sequencing (NGS) technologies are widely used to examine the microbial community composition in environmental samples. However, the sequencing capacity of NGS is sometimes insufficient to cover the whole microbial community, especially when analyzing soil and fecal microbiotas. This limitation may have hampered the detection of minority species that potentially affect microbiota formation and structure. Methods: We developed a simple method, termed 16S metagenome-DRIP (Deeper Resolution using an Inhibitory Primer), that not only enhances minority species detection but also increases the accuracy of their abundance estimation. The method relies on the inhibition of normal amplicon formation of the 16S rRNA gene of a target major (abundant) species during the first PCR step. The addition of a biotinylated primer that is complementary to the variable sequence of the V3-V4 region of the target species inhibits a normal amplification process to form an aberrant short amplicon. The fragment is then captured by streptavidin beads for removal from the reaction mixture, and the resulting mixture is utilized for the second PCR with barcode-tag primers. Thus, this method only requires two additional experimental procedures to the conventional 16S metagenome analysis. A proof-of-concept experiment was first conducted using a mock sample consisting of the genomes of 14 bacterial species. Then, the method was applied to infant fecal samples using a Bifidobacterium-specific inhibitory primer (n = 11). Results: As a result, the reads assigned to the family Bifidobacteriaceae decreased on average from 16,657 to 1718 per sample without affecting the total read counts (36,073 and 34,778 per sample for the conventional and DRIP methods, respectively). Furthermore, the minority species detection rate increased with neither affecting Bray-Curtis dissimilarity calculated by omitting the target Bifidobacterium species (median: 0.049) nor changing the relative abundances of the non-target species. While 115 amplicon sequence variants (ASVs) were unique to the conventional method, 208 ASVs were uniquely detected for the DRIP method. Moreover, the abundance estimation for minority species became more accurate, as revealed thorough comparison with the results of quantitative PCR analysis. Conclusion: The 16S metagenome-DRIP method serves as a useful technique to grasp a deeper and more accurate microbiota composition when combined with conventional 16S metagenome analysis methods.
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Affiliation(s)
- Aruto Nakajima
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keisuke Yoshida
- Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Miriam N. Ojima
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Mikiyasu Sakanaka
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Jin-Zhong Xiao
- Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Toshitaka Odamaki
- Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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8
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Ojima MN, Asao Y, Nakajima A, Katoh T, Kitaoka M, Gotoh A, Hirose J, Urashima T, Fukiya S, Yokota A, Abou Hachem M, Sakanaka M, Katayama T. Diversification of a Fucosyllactose Transporter within the Genus Bifidobacterium. Appl Environ Microbiol 2022; 88:e0143721. [PMID: 34731055 PMCID: PMC8788664 DOI: 10.1128/aem.01437-21] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [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: 07/26/2021] [Accepted: 10/29/2021] [Indexed: 11/20/2022] Open
Abstract
Human milk oligosaccharides (HMOs), which are natural bifidogenic prebiotics, were recently commercialized to fortify formula milk. However, HMO assimilation phenotypes of bifidobacteria vary by species and strain, which has not been fully linked to strain genotype. We have recently shown that specialized uptake systems, particularly for the internalization of major HMOs (fucosyllactose [FL]), are associated with the formation of a Bifidobacterium-rich gut microbial community. Phylogenetic analysis revealed that FL transporters have diversified into two clades harboring four clusters within the Bifidobacterium genus, but the underpinning functional diversity associated with this divergence remains underexplored. In this study, we examined the HMO consumption phenotypes of two bifidobacterial species, Bifidobacterium catenulatum subsp. kashiwanohense and Bifidobacterium pseudocatenulatum, both of which possess FL-binding proteins that belong to phylogenetic clusters with unknown specificities. Growth assays, heterologous gene expression experiments, and HMO consumption analyses showed that the FL transporter type from B. catenulatum subsp. kashiwanohense JCM 15439T conferred a novel HMO uptake pattern that includes complex fucosylated HMOs (lacto-N-fucopentaose II and lacto-N-difucohexaose I/II). Further genomic landscape analyses of FL transporter-positive bifidobacterial strains revealed that the H-antigen- or Lewis antigen-specific fucosidase gene(s) and FL transporter specificities were largely aligned. These results suggest that bifidobacteria have acquired FL transporters along with the corresponding gene sets necessary to utilize the imported HMOs. Our results provide insight into the species- and strain-dependent adaptation strategies of bifidobacteria in HMO-rich environments. IMPORTANCE The gut of breastfed infants is generally dominated by health-promoting bifidobacteria. Human milk oligosaccharides (HMOs) from breast milk selectively promote the growth of specific taxa such as bifidobacteria, thus forming an HMO-mediated host-microbe symbiosis. While the coevolution of humans and bifidobacteria has been proposed, the underpinning adaptive strategies employed by bifidobacteria require further research. Here, we analyzed the divergence of the critical fucosyllactose (FL) HMO transporter within Bifidobacterium. We have shown that the diversification of the solute-binding proteins of the FL transporter led to uptake specificities of fucosylated sugars ranging from simple trisaccharides to complex hexasaccharides. This transporter and the congruent acquisition of the necessary intracellular enzymes allow bifidobacteria to consume different types of HMOs in a predictable and strain-dependent manner. These findings explain the adaptation and proliferation of bifidobacteria in the competitive and HMO-rich infant gut environment and enable accurate specificity annotation of transporters from metagenomic data.
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Affiliation(s)
- Miriam N. Ojima
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Yuya Asao
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Aruto Nakajima
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | | | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Junko Hirose
- School of Human Cultures, The University of Shiga Prefecture, Hikone, Shiga, Japan
| | - Tadasu Urashima
- Department of Food and Life Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan
| | - Satoru Fukiya
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Atsushi Yokota
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Maher Abou Hachem
- Department of Biotechnology and Bioengineering, Technical University of Denmark, Lyngby, Denmark
| | | | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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9
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Hirano R, Sakanaka M, Yoshimi K, Sugimoto N, Eguchi S, Yamauchi Y, Nara M, Maeda S, Ami Y, Gotoh A, Katayama T, Iida N, Kato T, Ohno H, Fukiya S, Yokota A, Nishimoto M, Kitaoka M, Nakai H, Kurihara S. Next-generation prebiotic promotes selective growth of bifidobacteria, suppressing Clostridioides difficile. Gut Microbes 2021; 13:1973835. [PMID: 34553672 PMCID: PMC8475593 DOI: 10.1080/19490976.2021.1973835] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 08/12/2021] [Accepted: 08/19/2021] [Indexed: 02/04/2023] Open
Abstract
Certain existing prebiotics meant to facilitate the growth of beneficial bacteria in the intestine also promote the growth of other prominent bacteria. Therefore, the growth-promoting effects of β-galactosides on intestinal bacteria were analyzed. Galactosyl-β1,4-l-rhamnose (Gal-β1,4-Rha) selectively promoted the growth of Bifidobacterium. Bifidobacterium longum subsp. longum 105-A (JCM 31944) has multiple solute-binding proteins belonging to ATP-binding cassette transporters for sugars. Each strain in the library of 11 B. longum subsp. longum mutants, in which each gene of the solute-binding protein was disrupted, was cultured in a medium containing Gal-β1,4-Rha as the sole carbon source, and only the BL105A_0502 gene-disruption mutant showed delayed and reduced growth compared to the wild-type strain. BL105A_0502 homolog is highly conserved in bifidobacteria. In a Gal-β1,4-Rha-containing medium, Bifidobacterium longum subsp. infantis JCM 1222T, which possesses BLIJ_2090, a homologous protein to BL105A_0502, suppressed the growth of enteric pathogen Clostridioides difficile, whereas the BLIJ_2090 gene-disrupted mutant did not. In vivo, administration of B. infantis and Gal-β1,4-Rha alleviated C. difficile infection-related weight loss in mice. We have successfully screened Gal-β1,4-Rha as a next-generation prebiotic candidate that specifically promotes the growth of beneficial bacteria without promoting the growth of prominent bacteria and pathogens.
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Affiliation(s)
- Rika Hirano
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
- Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama, Japan
| | - Mikiyasu Sakanaka
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Kazuto Yoshimi
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Minato-ku, Tokyo, Japan
- Institute of Experimental Animal Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | | | - Syogo Eguchi
- Faculty of Agriculture, Niigata University, Niigata, Japan
| | - Yuko Yamauchi
- Division of Animal Genetics, Laboratory Animal Research Center, Institute of Medical Science, the University of Tokyo, Minato-ku, Tokyo, Japan
- Institute of Experimental Animal Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Misaki Nara
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Shingo Maeda
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Yuta Ami
- Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama, Japan
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Takane Katayama
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Noriho Iida
- Department of Gastroenterology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
| | - Tamotsu Kato
- Laboratory for Intestinal Ecosystem, Riken Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
| | - Hiroshi Ohno
- Laboratory for Intestinal Ecosystem, Riken Center for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
| | - Satoru Fukiya
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Atsushi Yokota
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Mamoru Nishimoto
- Institute of Food Research, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan
| | - Motomitsu Kitaoka
- Faculty of Agriculture, Niigata University, Niigata, Japan
- Institute of Food Research, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan
| | - Hiroyuki Nakai
- Faculty of Agriculture, Niigata University, Niigata, Japan
| | - Shin Kurihara
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
- Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama, Japan
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10
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Ojima MN, Gotoh A, Takada H, Odamaki T, Xiao JZ, Katoh T, Katayama T. Bifidobacterium bifidum Suppresses Gut Inflammation Caused by Repeated Antibiotic Disturbance Without Recovering Gut Microbiome Diversity in Mice. Front Microbiol 2020; 11:1349. [PMID: 32625197 PMCID: PMC7314955 DOI: 10.3389/fmicb.2020.01349] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 05/26/2020] [Indexed: 12/12/2022] Open
Abstract
The gut microbiome is a dynamic community that significantly affects host health; it is frequently disturbed by medications such as antibiotics. Recently, probiotics have been proposed as a remedy for antibiotic-induced dysbiosis, but the efficacy of such treatments remains uncertain. Thus, the effect of specific antibiotic-probiotic combinations on the gut microbiome and host health warrants further research. We tested the effect vancomycin, amoxicillin, and ciprofloxacin on mice. Antibiotic administration was followed by one of the following recovery treatments: Bifidobacterium bifidum JCM 1254 as a probiotic (PR); fecal transplant (FT); or natural recovery (NR). Each antibiotic administration and recovery treatment was repeated three times over 9 weeks. We used the Shannon Index and Chao1 Index to determine gut microbiome diversity and assessed recovery by quantifying the magnitude of microbial shift using the Bray-Curtis Index of Dissimilarity. We determined the community composition by sequencing the V3-V4 regions of the 16S ribosomal RNA gene. To assess host health, we measured body weight and cecum weight, as well as mRNA expression of inflammation-related genes by reverse-transcription quantitative PCR. Our results show that community response varied by the type of antibiotic used, with vancomycin having the most significant effects. As a result, the effect of probiotics and fecal transplants also varied by antibiotic type. For vancomycin, the first antibiotic disturbance substantially increased the relative abundance of inflammatory species in the phylum Proteobacteria, such as Proteus, but the effect of subsequent disturbances was less pronounced, suggesting that the gut microbiome is affected by past disturbance events. Furthermore, although gut microbiome diversity did not recover, probiotic supplementation was effective in limiting cecum size enlargement and colonic inflammation caused by vancomycin. However, for amoxicillin and ciprofloxacin, the relative abundances of proinflammatory species were not greatly affected, and consequently, the effect of probiotic supplementation on community structure, cecum weight, and expression of inflammation-related genes was comparatively negligible. These results indicate that probiotic supplementation is effective, but only when antibiotics cause proinflammatory species-induced gut inflammation, suggesting that the necessity of probiotic supplementation is strongly influenced by the type of disturbance introduced to the community.
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Affiliation(s)
- Miriam N. Ojima
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Aina Gotoh
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Hiromi Takada
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Toshitaka Odamaki
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Zama, Japan
| | - Jin-Zhong Xiao
- Next Generation Science Institute, Morinaga Milk Industry Co., Ltd., Zama, Japan
| | - Toshihiko Katoh
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Takane Katayama
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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11
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Katoh T, Ojima MN, Sakanaka M, Ashida H, Gotoh A, Katayama T. Enzymatic Adaptation of Bifidobacterium bifidum to Host Glycans, Viewed from Glycoside Hydrolyases and Carbohydrate-Binding Modules. Microorganisms 2020; 8:microorganisms8040481. [PMID: 32231096 PMCID: PMC7232152 DOI: 10.3390/microorganisms8040481] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/16/2020] [Accepted: 03/26/2020] [Indexed: 12/14/2022] Open
Abstract
Certain species of the genus Bifidobacterium represent human symbionts. Many studies have shown that the establishment of symbiosis with such bifidobacterial species confers various beneficial effects on human health. Among the more than ten (sub)species of human gut-associated Bifidobacterium that have significantly varied genetic characteristics at the species level, Bifidobacterium bifidum is unique in that it is found in the intestines of a wide age group, ranging from infants to adults. This species is likely to have adapted to efficiently degrade host-derived carbohydrate chains, such as human milk oligosaccharides (HMOs) and mucin O-glycans, which enabled the longitudinal colonization of intestines. The ability of this species to assimilate various host glycans can be attributed to the possession of an adequate set of extracellular glycoside hydrolases (GHs). Importantly, the polypeptides of those glycosidases frequently contain carbohydrate-binding modules (CBMs) with deduced affinities to the target glycans, which is also a distinct characteristic of this species among members of human gut-associated bifidobacteria. This review firstly describes the prevalence and distribution of B. bifidum in the human gut and then explains the enzymatic machinery that B. bifidum has developed for host glycan degradation by referring to the functions of GHs and CBMs. Finally, we show the data of co-culture experiments using host-derived glycans as carbon sources, which underpin the interesting altruistic behavior of this species as a cross-feeder.
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Affiliation(s)
- Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; (T.K.); (M.N.O.); (A.G.)
| | - Miriam N. Ojima
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; (T.K.); (M.N.O.); (A.G.)
| | - Mikiyasu Sakanaka
- National Food Institute, Technical University of Denmark, Kemitorvet, DK-2800 Kgs. Lyngby, Denmark;
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Hisashi Ashida
- Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama 649-6493, Japan;
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; (T.K.); (M.N.O.); (A.G.)
| | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; (T.K.); (M.N.O.); (A.G.)
- Correspondence: ; Tel.: +81-75-753-9233
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12
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Sakanaka M, Hansen ME, Gotoh A, Katoh T, Yoshida K, Odamaki T, Yachi H, Sugiyama Y, Kurihara S, Hirose J, Urashima T, Xiao JZ, Kitaoka M, Fukiya S, Yokota A, Lo Leggio L, Abou Hachem M, Katayama T. Evolutionary adaptation in fucosyllactose uptake systems supports bifidobacteria-infant symbiosis. Sci Adv 2019; 5:eaaw7696. [PMID: 31489370 PMCID: PMC6713505 DOI: 10.1126/sciadv.aaw7696] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 07/18/2019] [Indexed: 05/10/2023]
Abstract
The human gut microbiota established during infancy has persistent effects on health. In vitro studies have suggested that human milk oligosaccharides (HMOs) in breast milk promote the formation of a bifidobacteria-rich microbiota in infant guts; however, the underlying molecular mechanism remains elusive. Here, we characterized two functionally distinct but overlapping fucosyllactose transporters (FL transporter-1 and -2) from Bifidobacterium longum subspecies infantis. Fecal DNA and HMO consumption analyses, combined with deposited metagenome data mining, revealed that FL transporter-2 is primarily associated with the bifidobacteria-rich microbiota formation in breast-fed infant guts. Structural analyses of the solute-binding protein (SBP) of FL transporter-2 complexed with 2'-fucosyllactose and 3-fucosyllactose, together with phylogenetic analysis of SBP homologs of both FL transporters, highlight a unique adaptation strategy of Bifidobacterium to HMOs, in which the gain-of-function mutations enable FL transporter-2 to efficiently capture major fucosylated HMOs. Our results provide a molecular insight into HMO-mediated symbiosis and coevolution between bifidobacteria and humans.
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Affiliation(s)
- Mikiyasu Sakanaka
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Morten Ejby Hansen
- Department of Biotechnology and Bioengineering, Technical University of Denmark, Søltofts Plads, DK-2800 Kgs. Lyngby, Denmark
| | - Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
| | - Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
| | - Keisuke Yoshida
- Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Toshitaka Odamaki
- Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Hiroyuki Yachi
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Yuta Sugiyama
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Shin Kurihara
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Junko Hirose
- School of Human Cultures, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Tadasu Urashima
- Department of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
| | - Jin-zhong Xiao
- Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Motomitsu Kitaoka
- Food Research Institute, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8642, Japan
| | - Satoru Fukiya
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido 060-8589, Japan
| | - Atsushi Yokota
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido 060-8589, Japan
| | - Leila Lo Leggio
- Department of Chemistry, University of Copenhagen, Copenhagen 2100, Denmark
| | - Maher Abou Hachem
- Department of Biotechnology and Bioengineering, Technical University of Denmark, Søltofts Plads, DK-2800 Kgs. Lyngby, Denmark
- Corresponding author. (T.K.); (M.A.H.)
| | - Takane Katayama
- Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
- Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
- Corresponding author. (T.K.); (M.A.H.)
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13
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Gotoh A, Ojima MN, Katayama T. Minority species influences microbiota formation: the role of Bifidobacterium with extracellular glycosidases in bifidus flora formation in breastfed infant guts. Microb Biotechnol 2019; 12:259-264. [PMID: 30637938 PMCID: PMC6389856 DOI: 10.1111/1751-7915.13366] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 12/14/2018] [Indexed: 12/13/2022] Open
Abstract
The human body houses a variety of microbial ecosystems, such as the microbiotas on the skin, in the oral cavity and in the digestive tract. The gut microbiota is one such ecosystem that contains trillions of bacteria, and it is well established that it can significantly influence host health and diseases. With the advancement in bioinformatics tools, numerous comparative studies based on 16S ribosomal RNA (rRNA) gene sequences, metabolomics, pathological and epidemical analyses have revealed the correlative relationship between the abundance of certain taxa and disease states or amount of certain causative bioactive compounds. However, the 16S rRNA‐based taxonomic analyses using next‐generation sequencing (NGS) technology essentially detect only the majority species. Although the entire gut microbiome consists of 1013 microbial cells, NGS read counts are given in multiples of 106, making it difficult to determine the diversity of the entire microbiota. Some recent studies have reported instances where certain minority species play a critical role in creating locally stable conditions for other species by stabilizing the fundamental microbiota, despite their low abundance. These minority species act as ‘keystone species’, which is a species whose effect on the community is disproportionately large compared to its relative abundance. One of the attributes of keystone species within the gut microbiota is its extensive enzymatic capacity for substrates that are rare or difficult to degrade for other species, such as dietary fibres or host‐derived complex glycans, like human milk oligosaccharides (HMOs). In this paper, we propose that more emphasis should be placed on minority taxa and their possible role as keystone species in gut microbiota studies by referring to our recent studies on HMO‐mediated microbiota formation in the infant gut.
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Affiliation(s)
- Aina Gotoh
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Miriam Nozomi Ojima
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
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14
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Gotoh A, Shigenobu S, Yamaguchi K, Kobayashi S, Ito F, Tsuji K. Transcriptome characterization of male accessory glands in ants to identify molecules involved in their reproductive success. Insect Mol Biol 2018; 27:212-220. [PMID: 29226989 DOI: 10.1111/imb.12364] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In insects, seminal fluid proteins that are produced by male accessory glands and transferred to females during mating have key functions in sperm competition and sperm physiology that lead to male reproductive success. In ants, male reproductive success also depends on the longevity of sperm stored in the queen's spermatheca because their sexual offspring are usually produced only after a prolonged storage period. We identified genes that were up-regulated in the male accessory glands relative to the bodies of Crematogaster osakensis to characterize the reproductive molecules associated with male reproductive success in ants. We found novel genes that had no hits in a homology search and that were predominantly expressed in the accessory glands. These reproductive proteins may have evolved under rapid positive selection for reproductive success in the species. Furthermore, we discovered that three spermatheca-specific genes of C. osakensis queens were also enriched in the accessory glands relative to the bodies of males. These genes may be important for maintaining the sperm quality continuously from ejaculation by males to prolonged storage by queens. This research provides crucial information about the molecular mechanisms of sperm maintenance and sexual selection in ants, and also insight into the evolution of reproductive strategies in insects.
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Affiliation(s)
- A Gotoh
- Department of Biology, Faculty of Science and Engineering and Institute for Integrative Neurobiology, Konan University, Kobe, Japan
| | - S Shigenobu
- NIBB Core Research Facilities, National Institute for Basic Biology, Okazaki, Japan
- Department of Basic Biology, Faculty of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi, Japan
| | - K Yamaguchi
- NIBB Core Research Facilities, National Institute for Basic Biology, Okazaki, Japan
| | - S Kobayashi
- Life Science Center of Tsukuba Advanced Research Alliance (TARA Center), University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - F Ito
- Faculty of Agriculture, Kagawa University, Ikenobe, Miki, Japan
| | - K Tsuji
- Department of Agro-Environmental Sciences, Faculty of Agriculture, University of the Ryukyus, Okinawa, Nishihara, Japan
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15
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Sugiyama Y, Nara M, Sakanaka M, Gotoh A, Kitakata A, Okuda S, Kurihara S. Comprehensive analysis of polyamine transport and biosynthesis in the dominant human gut bacteria: Potential presence of novel polyamine metabolism and transport genes. Int J Biochem Cell Biol 2017; 93:52-61. [PMID: 29102547 DOI: 10.1016/j.biocel.2017.10.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 10/23/2017] [Accepted: 10/31/2017] [Indexed: 10/18/2022]
Abstract
Recent studies have reported that polyamines in the colonic lumen might affect animal health and these polyamines are thought to be produced by gut bacteria. In the present study, we measured the concentrations of three polyamines (putrescine, spermidine, and spermine) in cells and culture supernatants of 32 dominant human gut bacterial species in their growing and stationary phases. Combining polyamine concentration analysis in culture supernatant and cells with available genomic information showed that novel polyamine biosynthetic proteins and transporters were present in dominant human gut bacteria. Based on these findings, we suggested strategies for optimizing polyamine concentrations in the human colonic lumen via regulation of genes responsible for polyamine biosynthesis and transport in the dominant human gut bacteria.
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Affiliation(s)
- Yuta Sugiyama
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Misaki Nara
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | | | - Aina Gotoh
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Aya Kitakata
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Shujiro Okuda
- Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Japan
| | - Shin Kurihara
- Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan.
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16
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Katoh T, Maeshibu T, Kikkawa KI, Gotoh A, Tomabechi Y, Nakamura M, Liao WH, Yamaguchi M, Ashida H, Yamamoto K, Katayama T. Identification and characterization of a sulfoglycosidase from Bifidobacterium bifidum implicated in mucin glycan utilization. Biosci Biotechnol Biochem 2017; 81:2018-2027. [PMID: 28814130 DOI: 10.1080/09168451.2017.1361810] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Human gut symbiont bifidobacteria possess carbohydrate-degrading enzymes that act on the O-linked glycans of intestinal mucins to utilize those carbohydrates as carbon sources. However, our knowledge about mucin type O-glycan degradation by bifidobacteria remains fragmentary, especially regarding how they decompose sulfated glycans, which are abundantly found in mucin sugar-chains. Here, we examined the abilities of several Bifidobacterium strains to degrade a sulfated glycan substrate and identified a 6-sulfo-β-d-N-acetylglucosaminidase, also termed sulfoglycosidase, encoded by bbhII from Bifidobacterium bifidum JCM 7004. A recombinant BbhII protein showed a substrate preference toward 6-sulfated and 3,4-disulfated N-acetylglucosamines over non-sulfated and 3-sulfated N-acetylglucosamines. The purified BbhII directly released 6-sulfated N-acetylglucosamine from porcine gastric mucin and the expression of bbhII was moderately induced in the presence of mucin. This de-capping activity may promote utilization of sulfated glycans of mucin by other bacteria including bifidobacteria, thereby establishing the symbiotic relationship between human and gut microbes.
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Affiliation(s)
- Toshihiko Katoh
- a Graduate School of Biostudies , Kyoto University , Kyoto , Japan.,b Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Ishikawa , Japan
| | - Takako Maeshibu
- a Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Kei-Ichi Kikkawa
- b Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Ishikawa , Japan
| | - Aina Gotoh
- a Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Yusuke Tomabechi
- b Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Ishikawa , Japan
| | | | - Wei-Hsiang Liao
- a Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | | | - Hisashi Ashida
- d Faculty of Biology-Oriented Science and Technology , Kindai University , Kinokawa , Japan
| | - Kenji Yamamoto
- b Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Ishikawa , Japan
| | - Takane Katayama
- a Graduate School of Biostudies , Kyoto University , Kyoto , Japan.,b Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Ishikawa , Japan
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Gotoh A, Nara M, Sugiyama Y, Sakanaka M, Yachi H, Kitakata A, Nakagawa A, Minami H, Okuda S, Katoh T, Katayama T, Kurihara S. Use of Gifu Anaerobic Medium for culturing 32 dominant species of human gut microbes and its evaluation based on short-chain fatty acids fermentation profiles. Biosci Biotechnol Biochem 2017; 81:2009-2017. [PMID: 28782454 DOI: 10.1080/09168451.2017.1359486] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Recently, a "human gut microbial gene catalogue," which ranks the dominance of microbe genus/species in human fecal samples, was published. Most of the bacteria ranked in the catalog are currently publicly available; however, the growth media recommended by the distributors vary among species, hampering physiological comparisons among the bacteria. To address this problem, we evaluated Gifu anaerobic medium (GAM) as a standard medium. Forty-four publicly available species of the top 56 species listed in the "human gut microbial gene catalogue" were cultured in GAM, and out of these, 32 (72%) were successfully cultured. Short-chain fatty acids from the bacterial culture supernatants were then quantified, and bacterial metabolic pathways were predicted based on in silico genomic sequence analysis. Our system provides a useful platform for assessing growth properties and analyzing metabolites of dominant human gut bacteria grown in GAM and supplemented with compounds of interest.
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Affiliation(s)
- Aina Gotoh
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan.,b Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Misaki Nara
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Yuta Sugiyama
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Mikiyasu Sakanaka
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Hiroyuki Yachi
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Aya Kitakata
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Akira Nakagawa
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Hiromichi Minami
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
| | - Shujiro Okuda
- c Graduate School of Medical and Dental Sciences , Niigata University , Niigata , Japan
| | - Toshihiko Katoh
- b Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Takane Katayama
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan.,b Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Shin Kurihara
- a Research Institute for Bioresources and Biotechnology , Ishikawa Prefectural University , Nonoichi , Japan
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18
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Sugiyama Y, Katoh T, Honda Y, Gotoh A, Ashida H, Kurihara S, Yamamoto K, Katayama T. Application study of 1,2-α-l-fucosynthase: introduction of Fucα1-2Gal disaccharide structures on N-glycan, ganglioside, and xyloglucan oligosaccharide. Biosci Biotechnol Biochem 2016; 81:283-291. [PMID: 27832720 DOI: 10.1080/09168451.2016.1254532] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
We have recently generated a highly efficient 1,2-α-l-fucosynthase (BbAfcA N423H mutant) by protein engineering of 1,2-α-l-fucosidase from Bifidobacterium bifidum JCM 1254. This synthase could specifically introduce H-antigens (Fucα1-2Gal) into the non-reducing ends of oligosaccharides and in O-linked glycans in mucin glycoprotein. In the present study, we show an extended application of the engineered 1,2-α-l-fucosynthase by demonstrating its ability to insert Fuc residues into N- and O-glycans in fetuin glycoproteins, GM1 ganglioside, and a plant-derived xyloglucan nonasaccharide. This application study broadens the feasibility of this novel H-antigen synthesis technique in functional glycomics.
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Affiliation(s)
- Yuta Sugiyama
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan
| | - Toshihiko Katoh
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan.,b Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Yuji Honda
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan
| | - Aina Gotoh
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan.,b Graduate School of Biostudies , Kyoto University , Kyoto , Japan
| | - Hisashi Ashida
- c Faculty of Biology-Oriented Science and Technology , Kindai University , Kinokawa , Japan
| | - Shin Kurihara
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan
| | - Kenji Yamamoto
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan
| | - Takane Katayama
- a Faculty of Bioresources and Environmental Sciences , Ishikawa Prefectural University , Nonoichi , Japan.,b Graduate School of Biostudies , Kyoto University , Kyoto , Japan
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Sugiyama Y, Gotoh A, Katoh T, Honda Y, Yoshida E, Kurihara S, Ashida H, Kumagai H, Yamamoto K, Kitaoka M, Katayama T. Introduction of H-antigens into oligosaccharides and sugar chains of glycoproteins using highly efficient 1,2-α-l-fucosynthase. Glycobiology 2016; 26:1235-1247. [DOI: 10.1093/glycob/cww085] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 08/16/2016] [Accepted: 08/16/2016] [Indexed: 12/17/2022] Open
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Hidaka M, Gotoh A, Shimizu T, Minamisawa K, Imamura H, Uchida T. Visualization of NO3⁻/NO2⁻ Dynamics in Living Cells by Fluorescence Resonance Energy Transfer (FRET) Imaging Employing a Rhizobial Two-component Regulatory System. J Biol Chem 2015; 291:2260-9. [PMID: 26631727 DOI: 10.1074/jbc.m115.687632] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Indexed: 12/22/2022] Open
Abstract
Nitrate (NO3(-)) and nitrite (NO2(-)) are the physiological sources of nitric oxide (NO), a key biological messenger molecule. NO3(-)/NO2(-) exerts a beneficial impact on NO homeostasis and its related cardiovascular functions. To visualize the physiological dynamics of NO3(-)/NO2(-) for assessing the precise roles of these anions, we developed a genetically encoded intermolecular fluorescence resonance energy transfer (FRET)-based indicator, named sNOOOpy (sensor for NO3(-)/NO2(-) in physiology), by employing NO3(-)/NO2(-)-induced dissociation of NasST involved in the denitrification system of rhizobia. The in vitro use of sNOOOpy shows high specificity for NO3(-) and NO2(-), and its FRET signal is changed in response to NO3(-)/NO2(-) in the micromolar range. Furthermore, both an increase and decrease in cellular NO3(-) concentration can be detected. sNOOOpy is very simple and potentially applicable to a wide variety of living cells and is expected to provide insights into NO3(-)/NO2(-) dynamics in various organisms, including plants and animals.
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Affiliation(s)
- Masafumi Hidaka
- From the Department of Molecular Cell Science, Tohoku University, Sendai 981-8555
| | - Aina Gotoh
- From the Department of Molecular Cell Science, Tohoku University, Sendai 981-8555
| | - Taiki Shimizu
- From the Department of Molecular Cell Science, Tohoku University, Sendai 981-8555
| | - Kiwamu Minamisawa
- the Department of Environmental Life Sciences, Tohoku University, Sendai 980-8577, and
| | - Hiromi Imamura
- The Hakubi Center for Advanced Research, Kyoto University, Kyoto 606-8501, Japan
| | - Takafumi Uchida
- From the Department of Molecular Cell Science, Tohoku University, Sendai 981-8555,
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Sánchez C, Itakura M, Okubo T, Matsumoto T, Yoshikawa H, Gotoh A, Hidaka M, Uchida T, Minamisawa K. The nitrate-sensing NasST system regulates nitrous oxide reductase and periplasmic nitrate reductase in Bradyrhizobium japonicum. Environ Microbiol 2014; 16:3263-74. [PMID: 24947409 DOI: 10.1111/1462-2920.12546] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 06/13/2014] [Indexed: 11/30/2022]
Abstract
The soybean endosymbiont Bradyrhizobium japonicum is able to scavenge the greenhouse gas N2O through the N2O reductase (Nos). In previous research, N2O emission from soybean rhizosphere was mitigated by B. japonicum Nos(++) strains (mutants with increased Nos activity). Here, we report the mechanism underlying the Nos(++) phenotype. Comparative analysis of Nos(++) mutant genomes showed that mutation of bll4572 resulted in Nos(++) phenotype. bll4572 encodes NasS, the nitrate (NO3(-))-sensor of the two-component NasST regulatory system. Transcriptional analyses of nosZ (encoding Nos) and other genes from the denitrification process in nasS and nasST mutants showed that, in the absence of NO3(-) , nasS mutation induces nosZ and nap (periplasmic nitrate reductase) via nasT. NO3(-) addition dissociated the NasS-NasT complex in vitro, suggesting the release of the activator NasT. Disruption of nasT led to a marked decrease in nosZ and nap transcription in cells incubated in the presence of NO3(-). Thus, although NasST is known to regulate the NO3(-)-mediated response of NO3(-) assimilation genes in bacteria, our results show that NasST regulates the NO3(-) -mediated response of nosZ and napE genes, from the dissimilatory denitrification pathway, in B. japonicum.
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Affiliation(s)
- Cristina Sánchez
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
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Hiradate Y, Inoue H, Kobayashi N, Shirakata Y, Suzuki Y, Gotoh A, Roh SG, Uchida T, Katoh K, Yoshida M, Sato E, Tanemura K. Neurotensin enhances sperm capacitation and acrosome reaction in mice. Biol Reprod 2014; 91:53. [PMID: 25031361 DOI: 10.1095/biolreprod.113.112789] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Neurotensin (NT) has multiple functions, ranging from acting as a neurotransmitter to regulating intestinal movement. However, its function in reproductive physiology is unknown. Here, we confirmed the expression and localization of NT receptors (NTR1) in mouse epididymal spermatozoa and investigated the effect of NT on sperm function. Sperm protein tyrosine phosphorylation, one of the indices of sperm capacitation, was facilitated dose-dependently by NT administration. In addition, the acrosome reaction was promoted in capacitated spermatozoa, and addition of a selective antagonist of NTR1 and NTR2 blocked the induction. Furthermore, intracellular calcium mobilization by NT addition was observed. This showed that NT was an accelerator of sperm function via its functional receptors. The presence of NT was confirmed by immunohistochemistry and its localization was observed in epithelia of the uterus and oviduct isthmus and ampulla, which correspond to the fertilization route of spermatozoa. The NT mRNA level in ovulated cumulus cell was remarkably increased by treatment with human chorionic gonadotropin (hCG). Using an in vitro maturation model, we analyzed the effects of FSH, epidermal growth factor (EGF), estradiol, and progesterone in NT production in cumulus cells. We found that FSH and EGF upregulated NT release and mRNA expression. Both FSH- and EGF-induced upregulation were inhibited by U0126, an MAPK kinase inhibitor, indicating that FSH and EGF regulate NT expression via a MAPK-dependent pathway. This evidence suggests that NT can act as a promoter of sperm capacitation and the acrosome reaction in the female reproductive tract.
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Affiliation(s)
- Yuuki Hiradate
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Hiroki Inoue
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Norio Kobayashi
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Yoshiki Shirakata
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Yutaka Suzuki
- Laboratory of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Aina Gotoh
- Laboratory of Enzymology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Sang-Gun Roh
- Laboratory of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Takafumi Uchida
- Laboratory of Enzymology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Kazuo Katoh
- Laboratory of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Manabu Yoshida
- Misaki Marine Biological Station, Graduate School of Science, University of Tokyo, Kanagawa, Japan
| | - Eimei Sato
- National Livestock Breeding, Fukushima, Japan
| | - Kentaro Tanemura
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
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Inoue H, Hiradate Y, Shirakata Y, Kanai K, Kosaka K, Gotoh A, Fukuda Y, Nakai Y, Uchida T, Sato E, Tanemura K. Site-specific phosphorylation of Tau protein is associated with deacetylation of microtubules in mouse spermatogenic cells during meiosis. FEBS Lett 2014; 588:2003-8. [DOI: 10.1016/j.febslet.2014.04.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 03/26/2014] [Accepted: 04/10/2014] [Indexed: 11/26/2022]
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Gotoh A, Hidaka M, Hirose K, Uchida T. Gas7b (growth arrest specific protein 7b) regulates neuronal cell morphology by enhancing microtubule and actin filament assembly. J Biol Chem 2013; 288:34699-706. [PMID: 24151073 DOI: 10.1074/jbc.m113.513119] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Neurons undergo several morphological changes as a part of normal neuron maturation process. Alzheimer disease is associated with increased neuroproliferation and impaired neuronal maturation. In this study, we demonstrated that Gas7b (growth arrest specific protein 7b) expression in a neuronal cell line, Neuro 2A, induces cell maturation by facilitating formation of dendrite-like processes and/or filopodia projections and that Gas7b co-localizes with neurite microtubules. Molecular analysis was performed to evaluate whether Gas7b associates with actin filaments and microtubules, and the data revealed two novel roles of Gas7b in neurite outgrowth: we showed that Gas7b enhances bundling of several microtubule filaments and connects microtubules with actin filaments. These results suggest that Gas7b governs neural cell morphogenesis by enhancing the coordination between actin filaments and microtubules. We conclude that lower neuronal Gas7b levels may impact Alzheimer disease progression.
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Affiliation(s)
- Aina Gotoh
- From the Molecular Enzymology, Department of Molecular Cell Science, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 981-8555, Japan and
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Hidaka M, Koga T, Gotoh A, Sanada M, Hirose K, Uchida T. Alzheimer's disease-related protein hGas7b interferes with kinesin motility. J Biochem 2012; 151:593-8. [PMID: 22496485 DOI: 10.1093/jb/mvs038] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In the previous study, we reported the important properties of hGas7b (i) that binds to phospho-tau and facilitates microtubule polymerization and (ii) the level of hGas7b is very low in the brains of patients with Alzheimer's disease. These results led us to study the function of hGas7b in detail. We focused on the effect of hGas7b on microtubule dynamics in the absence of tau, on the assumption of healthy tau decrease in the brains of Alzheimer's disease. hGas7b binds to microtubule directly without tau, although this binding does not enhance microtubule polymerization. Excess hGas7b interferes with kinesin motility on microtubules. These results suggest that regulation to maintain an appropriate concentration of hGas7b is required for healthy neurotransmission.
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Affiliation(s)
- Masafumi Hidaka
- Molecular Enzymology, Department of Molecular Cell Science, Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai, Japan
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Cook CC, Kim A, Terao S, Gotoh A, Higuchi M. Consumption of oxygen: a mitochondrial-generated progression signal of advanced cancer. Cell Death Dis 2012; 3:e258. [PMID: 22258408 PMCID: PMC3270275 DOI: 10.1038/cddis.2011.141] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [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: 09/30/2011] [Revised: 11/15/2011] [Accepted: 11/21/2011] [Indexed: 11/29/2022]
Abstract
Changes in mitochondrial genome such as mutation, deletion and depletion are common in cancer and can determine advanced phenotype of cancer; however, detailed mechanisms have not been elucidated. We observed that loss of mitochondrial genome reversibly induced overexpression and activation of proto-oncogenic Ras, especially K-Ras 4A, responsible for the activation of AKT and ERK leading to advanced phenotype of prostate and breast cancer. Ras activation was induced by the overexpression of 3-hydroxy-3-methyl-glutaryl-CoA reductase (HMGR), the rate-limiting enzyme of the mevalonate pathway. Hypoxia is known to induce proteasomal degradation of HMGR. Well differentiated prostate and breast cancer cells with high mitochondrial DNA content consumed a large amount of oxygen and induced hypoxia. Loss of mitochondrial genome reduced oxygen consumption and increased in oxygen concentration in the cells. The hypoxic-to-normoxic shift led to the overexpression of HMGR through inhibiting proteasomal degradation. Therefore, reduction of mitochondrial genome content induced overexpression of HMGR through hypoxic to normoxic shift and subsequently the endogenous induction of the mevalonate pathway activated Ras that mediates advanced phenotype. Reduction of mitochondrial genome content was associated with the aggressive phenotype of prostate cancer in vitro cell line model and tissue specimens in vivo. Our results elucidate a coherent mechanism that directly links the mitochondrial genome with the advanced progression of the disease.
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Affiliation(s)
- C C Cook
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - A Kim
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - S Terao
- Laboratory of Cell and Gene Therapy, Institute for Advanced Medical Sciences, Hyogo College of Medicine, Nishinomiya, Japan
- Advanced Medicinal Research Center, Hyogo University of Health Science, Kobe, Japan
| | - A Gotoh
- Laboratory of Cell and Gene Therapy, Institute for Advanced Medical Sciences, Hyogo College of Medicine, Nishinomiya, Japan
- Advanced Medicinal Research Center, Hyogo University of Health Science, Kobe, Japan
| | - M Higuchi
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
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Akiyama H, Gotoh A, Shin RW, Koga T, Ohashi T, Sakamoto W, Harada A, Arai H, Sawa A, Uchida C, Uchida T. A novel role for hGas7b in microtubular maintenance: possible implication in tau-associated pathology in Alzheimer disease. J Biol Chem 2009; 284:32695-9. [PMID: 19801671 DOI: 10.1074/jbc.m109.035998] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Here, we report a novel role for hGas7b (human growth arrest specific protein 7b) in the regulation of microtubules. Using a bioinformatic approach, we studied the actin-binding protein hGas7b with a structural similarity to the WW domain of a peptidyl prolyl cis/trans isomerase, Pin1, that facilitates microtubule assembly. Thus, we have demonstrated that hGas7b binds Tau at the WW motif and that the hGas7b/Tau protein complex interacts with the microtubules, promoting tubulin polymerization. Tau, in turn, contributes to protein stability of hGas7b. Furthermore, we observed decreased levels of hGas7b in the brains from patients with Alzheimer disease. These results suggest an important role for hGas7b in microtubular maintenance and possible implication in Alzheimer disease.
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Affiliation(s)
- Hirotada Akiyama
- Department of Molecular Enzymology, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 981-8555, Japan
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Shigemura K, Chung L, Arbiser J, Gotoh A, Yamashita M, Fujisawa M. 7040 Honokiol, a natural plant product from magnolia tree, inhibits the bone metastatic growth of human prostate cancer cells. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71418-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Gotoh A, Hamada Y, Shiobara N, Kumagai K, Seto K, Horikawa T, Suzuki R. Skew in T cell receptor usage with polyclonal expansion in lesions of oral lichen planus without hepatitis C virus infection. Clin Exp Immunol 2008; 154:192-201. [PMID: 18782324 DOI: 10.1111/j.1365-2249.2008.03763.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Oral lichen planus (OLP) is a refractory disorder of the oral mucosa. Its predominant symptoms are pain and haphalgesia that impair the quality of life of patients. OLP develops via a T cell-mediated immune process. Here, we examined the characteristics of the infiltrating T cells in terms of the T cell receptor (TCR) repertoires, T cell clonality, T cell phenotypes and cytokine production profiles. TCR repertoire analyses and CDR3 size spectratyping were performed using peripheral blood mononuclear cells (PBMCs) and tissue specimens of OLP biopsies from 12 patients. The cytokine expression profiles and T cell phenotypes were measured by real-time quantitative polymerase chain reaction. We observed that there were skewed TCR repertoires in the tissue samples (TCRVA8-1, VA22-1, VB2-1, VB3-1 and VB5-1) and PBMCs (TCRVA8-1, VB2-1, VB3-1 and VB5-1) from OLP patients. Furthermore, the CDR3 distributions in the skewed TCR subfamilies exhibited polyclonal patterns. We observed increases in CD4(+) T lymphocytes, interleukin (IL)-5, tumour necrosis factor (TNF)-alpha and human leucocyte antigen D-related in the OLP tissue specimens. Taken together, the present results suggest that T cells bearing these TCRs are involved in the pathogenesis of OLP, and that IL-5 and TNF-alpha may participate in its inflammatory process.
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Affiliation(s)
- A Gotoh
- First Department of Oral and Maxillofacial Surgery, School of Dental Medicine, Tsurumi University, Yokohama, Japan
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Hara I, Miyake H, Hara S, Gotoh A, Nakamura I, Okada H, Arakawa S, Kamidono S. Health-related quality of life after radical cystectomy for bladder cancer: a comparison of ileal conduit and orthotopic bladder replacement. BJU Int 2008. [DOI: 10.1046/j.1464-410x.2002.02529.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ohyashiki K, Kiguchi T, Ito Y, Gotoh A, Tauchi T, Miyazawa K, Kimura Y, Hisatomi H, Ohyashiki JH. Isolated Erythrocythemia: A Distinct Entity or a Sub-type of Polycythemia Vera? Jpn J Clin Oncol 2008; 38:230-2. [DOI: 10.1093/jjco/hym174] [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: 11/14/2022] Open
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Shiobara N, Suzuki Y, Aoki H, Gotoh A, Fujii Y, Hamada Y, Suzuki S, Fukui N, Kurane I, Itoh T, Suzuki R. Bacterial superantigens and T cell receptor beta-chain-bearing T cells in the immunopathogenesis of ulcerative colitis. Clin Exp Immunol 2007; 150:13-21. [PMID: 17614973 PMCID: PMC2219284 DOI: 10.1111/j.1365-2249.2007.03443.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Ulcerative colitis (UC) is a chronic relapsing-remitting inflammatory bowel disease (IBD) that affects the colon and the rectum producing debilitating symptoms, which impair ability to function and quality of life. The aetiology of IBD is incompletely understood, but within the lymphocyte population, specific T cell subsets are known to be major factors in the development of intestinal immune pathology while different subsets are essential regulators, controlling IBD. Hence, IBD is thought to reflect dysregulated T cell behaviour. This study was to investigate if the normal molecular configuration of the T cell receptor (TCR) repertoire is compromised in patients with UC. The percentage of T cell-bearing beta-chain 4 (TCRBV4) was high in patients with UC, and T cells showed polyclonal expansion in the presence of bacterial superantigens (SA) such as streptococcal mitogenic exotoxin Z-2 (SMEZ-2), indicating that bacterial SA promote specific TCRBV family expansion. Further, in patients with UC, the duration of UC was significantly longer in patients with skewed TCRBV4 compared with patients without TCRBV4 skewing, suggesting that long-term exposure to bacterial SA such as SMEZ-2 might promote systemic immune disorders like the remission-relapsing cycles seen in patients with UC. In conclusion, our observations in this study support the perception that the systemic activation of T cells by enteric bacterial SA might lead to a dysregulated, but exuberant immune activity causing the remission and flare-up cycle of mucosal inflammation in patients with UC. Future studies should strengthen our findings and increase understanding on the aetiology of IBD.
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Affiliation(s)
- N Shiobara
- Department of Rheumatology and Clinical Immunology, Clinical Research Center for Allergy and Rheumatology, National Sagamihara Hospital, Kanagawa, Japan.
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Ohyashiki K, Akahane D, Gotoh A, Ito Y, Tauchi T, Miyazawa K, Kimura Y, Ohyashiki JH. Uncontrolled thrombocytosis in polycythemia vera is a risk for thrombosis, regardless of JAK2V617F mutational status. Leukemia 2007; 21:2544-5. [PMID: 17611562 DOI: 10.1038/sj.leu.2404829] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Ohyashiki K, Aota Y, Akahane D, Gotoh A, Ohyashiki JH. JAK2(V617F) mutational status as determined by semiquantitative sequence-specific primer-single molecule fluorescence detection assay is linked to clinical features in chronic myeloproliferative disorders. Leukemia 2007; 21:1097-9. [PMID: 17315023 DOI: 10.1038/sj.leu.2404604] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Higuchi M, Kudo T, Suzuki S, Evans TT, Sasaki R, Wada Y, Shirakawa T, Sawyer JR, Gotoh A. Mitochondrial DNA determines androgen dependence in prostate cancer cell lines. Oncogene 2006; 25:1437-45. [PMID: 16278679 PMCID: PMC2215312 DOI: 10.1038/sj.onc.1209190] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Prostate cancer progresses from an androgen-dependent to androgen-independent stage after androgen ablation therapy. Mitochondrial DNA plays a role in cell death and metastatic competence. Further, heteroplasmic large-deletion mitochondrial DNA is very common in prostate cancer. To investigate the role of mitochondrial DNA in androgen dependence of prostate cancers, we tested the changes of normal and deleted mitochondrial DNA in accordance with the progression of prostate cancer. We demonstrated that the androgen-independent cell line C4-2, established by inoculation of the androgen-dependent LNCaP cell line into castrated mice, has a greatly reduced amount of normal mitochondrial DNA and an accumulation of large-deletion DNA. Strikingly, the depletion of mitochondrial DNA from androgen-dependent LNCaP resulted in a loss of androgen dependence. Reconstitution of normal mitochondrial DNA to the mitochondrial DNA-depleted clone restored androgen dependence. These results indicate that mitochondrial DNA determines androgen dependence of prostate cancer cell lines. Further, mitochondrial DNA-deficient cells formed tumors in castrated athymic mice, whereas LNCaP did not. The accumulation of large deletion and depletion of mitochondrial DNA may thus play a role in the development of androgen independence, leading to progression of prostate cancers.
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Affiliation(s)
- M Higuchi
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR 72205-7199, USA.
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Sumi M, Tauchi T, Sashida G, Shoji N, Gotoh A, Itoh Y, Miyazawa K, Kimura Y, Ohyashiki JH, Ohyashiki K. Clinical usefulness of transcription-mediated amplification and hybridization protection assay in imatinib-treated chronic myelogenous leukemia patients. ACTA ACUST UNITED AC 2006; 27:416-7. [PMID: 16307547 DOI: 10.1111/j.1365-2257.2005.00723.x] [Citation(s) in RCA: 8] [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: 11/28/2022]
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37
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Ohyashiki K, Aota Y, Akahane D, Gotoh A, Miyazawa K, Kimura Y, Ohyashiki JH. The JAK2 V617F tyrosine kinase mutation in myelodysplastic syndromes (MDS) developing myelofibrosis indicates the myeloproliferative nature in a subset of MDS patients. Leukemia 2005; 19:2359-60. [PMID: 16239910 DOI: 10.1038/sj.leu.2403989] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Okahara S, Arimura Y, Yabana T, Kobayashi K, Gotoh A, Motoya S, Imamura A, Endo T, Imai K. Inflammatory gene signature in ulcerative colitis with cDNA macroarray analysis. Aliment Pharmacol Ther 2005; 21:1091-7. [PMID: 15854170 DOI: 10.1111/j.1365-2036.2005.02443.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Most array analyses of ulcerative colitis have focused on identifying susceptibility genes for ulcerative colitis. AIM To clarify the changes in gene expression during inflammation in ulcerative colitis colon mucosa using cDNA macroarray. METHODS From 23 ulcerative colitis patients, 16 each of inflamed and non-inflamed specimens (total 32 samples for individual analysis) were obtained by colonoscopic biopsy. Eighteen of the 32 samples, used for pairwise analysis, consisted of nine sample pairs, each pair being from the same patient. We examined expression profiles of approximately 1300 genes with cDNA macroarray. Comparisons were made using two kinds of statistics, t-test and significance analysis of microarray in both analyses. The reproducibility of significant genes from the macroarray analysis was confirmed by real-time ploymerase chain reaction. RESULTS We detected five upregulated genes, categorized into proinflammatory genes (MRP14, GRO gamma and SAA1) and anti-inflammatory genes (TIMP1 and Elafin) in inflamed mucosa, and one upregulated gene (L-FABP) in non-inflamed mucosa. CONCLUSIONS As the cDNA macroarray analysis in this study exactly reflects the total profile of gene expression in the clinical setting of ulcerative colitis, the genes identified will be directly applicable to diagnostics or as novel therapeutic targets in active ulcerative colitis.
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Affiliation(s)
- S Okahara
- First Department of Internal Medicine, Sapporo Medical University, Sapporo, Japan.
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Shigemura K, Shirakawa T, Okada H, Tanaka K, Kamidono S, Arakawa S, Gotoh A. Rapid detection and differentiation of Gram-negative and Gram-positive pathogenic bacteria in urine using TaqMan probe. Clin Exp Med 2005; 4:196-201. [PMID: 15750767 DOI: 10.1007/s10238-004-0056-x] [Citation(s) in RCA: 17] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2004] [Accepted: 01/18/2005] [Indexed: 11/28/2022]
Abstract
Urinary tract infection has been shown to be quite complicated and often difficult to diagnose and treat. For appropriate diagnosis, it is very important to find the correct Gram stain classification as soon as possible, especially in severe cases where there is a possibility of severe sepsis developing. In order to solve this problem, we developed a new method to detect a Gram stain of bacteria obtained from 1 ml of urine from urinary tract infection patients using a consensus real-time PCR protocol with a TaqMan probe that allows detection of spiked bacterial 16S DNA from urine. We extracted DNA of 55 urine samples obtained from patients with complicated urinary tract infection and at the same time performed urine culture testing. After DNA extraction, they were subjected to real-time PCR using a TaqMan discrimination system. Sixteen kinds of bacteria were cultured from the urine culture testing. Of these bacteria, eight were classified as Gram-positive bacteria and the other eight were classified as Gram-negative bacteria. Of the 55 samples, the TaqMan technique result showed 27 samples that were classified as Gram-negative bacteria; 11 samples that were Gram-positive, 10 that included both Gram-negative and -positive bacteria, and 7 that showed no amplification. The classifications of all samples corresponded exactly to those determined by urine culture testing. The present genotyping method of real-time PCR using a TaqMan discrimination system could be applied to the rapid detection of Gram-positive or -negative bacteria in urine of urinary tract infection patients. This assay can differentiate those species tested, but whether the presence of other (untested) bacteria could lead to misinterpretation is unknown. For further investigation, it is important to test other (untested) bacteria in the near future.
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Affiliation(s)
- K Shigemura
- Division of Urology, Department of Organs Therapeutics, Faculty of Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
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Gotoh A, Sameshima S, Tsuji K, Matsumoto T, Miura T. Apoptotic wing degeneration and formation of an altruism-regulating glandular appendage (gemma) in the ponerine ant Diacamma sp. from Japan (Hymenoptera, Formicidae, Ponerinae). Dev Genes Evol 2005; 215:69-77. [PMID: 15647944 DOI: 10.1007/s00427-004-0456-7] [Citation(s) in RCA: 21] [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] [Subscribe] [Scholar Register] [Received: 05/15/2004] [Accepted: 11/21/2004] [Indexed: 12/06/2022]
Abstract
We here show an example of morphological novelties, which have evolved from insect wings into the specific structures controlling social behaviour in an ant species. Most ant colonies consist of winged queen(s) and wingless workers. In the queenless ponerine ant Diacamma sp. from Japan, however, all female workers have a pair of small thoracic appendages, called "gemmae", which are homologous to the forewings and acts as an organ regulating altruism expression. Most workers, whose gemmae are clipped off by other colony members, become nonreproductive helpers, while only a single individual with complete gemmae becomes functionally reproductive. We examined histologically the development of gemmae, and compared it with that of functional wings in males. Female larvae had well-developed wing discs for both fore- and hindwings. At pupation, however, the wing discs started to evaginate and later degenerate. The hindwing discs completely degenerated, while the degeneration of forewing discs was incomplete, leading to the formation of gemmae. The degeneration process involved apoptotic cell death as confirmed by TUNEL assay. In addition, glandular cells differentiated from the epithelial cells of the forewing buds after completion of pupation. The mechanism of developmental transition from wing to gemma can be regarded as an evolutionary gain of new function, which can be seen in insect appendages and vertebrate limbs.
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Affiliation(s)
- A Gotoh
- Department of Biology, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Ito Y, Yamaguchi N, Sumi M, Sashida G, Okabe S, Katagiri T, Shoji N, Iwase O, Gotoh A, Ohyashiki K. P-77 Itraconazole capsules versusfluconazole capsules for anti-fungal chemoprophylaxis in patients with myelodysplastic syndromes or acute myeloid leukemia with multilineage dysplasia. Leuk Res 2005. [DOI: 10.1016/s0145-2126(05)80141-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sumi M, Tauchi T, Sashida G, Nakajima A, Gotoh A, Shin-Ya K, Ohyashiki JH, Ohyashiki K. A G-quadruplex-interactive agent, telomestatin (SOT-095), induces telomere shortening with apoptosis and enhances chemosensitivity in acute myeloid leukemia. Int J Oncol 2004; 24:1481-7. [PMID: 15138591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
Telomerase, the ribonucleoprotein enzyme maintaining the telomeres of eukaryotic chromosomes, is up-regulated in the vast majority of human neoplasias but not in normal somatic tissues. Therefore, the telomerase complex represents a promising universal therapeutic target in cancer. Telomeric G-rich single-stranded DNA can adopt in vitro an intramolecular quadruplex structure, which has been shown to inhibit telomerase activity. We examined G-quadruplex interactive agent, telomestatin (SOT-095), for its ability to inhibit the proliferation of human leukemia cells, including freshly obtained leukemia cells. Telomere length was determined by either the terminal restriction fragment method or flow-FISH, and apoptosis was assessed by flow cytometry. Moreover, chemosensitivity was examined in telomestatin-treated U937 cells before ultimate telomere shortening. Treatment with telomestatin reproducibly inhibited telomerase activity in U937 and NB4 cells followed by telomere shortening. Enhanced chemosensitivity toward daunorubicin and cytosine-arabinoside was observed in telomestatin-treated U937 cells, before ultimate telomere shortening. Telomere shortening associated with apoptosis by telomestatin was evident in some freshly obtained leukemia cells from acute myeloid leukemia patients, regardless of sub-types of AML and post-myelodysplasia AML. These results suggest that disruption of telomere maintenance by telomestatin limits the cellular lifespan of AML cells, as well. However, in a minority of AML patients apoptosis was not evident, thus indicating that resistant mechanism might exist in some freshly obtained AML cells. Therefore, further investigation of telomestatin as a therapeutic agent is warranted.
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Affiliation(s)
- M Sumi
- First Department of Internal Medicine, Tokyo Medical University, Tokyo 160-0023, Japan
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Shigemura K, Okada H, Shirakawa T, Tanaka K, Arakawa S, Kinoshita S, Gotoh A, Kamidono S. Susceptibilities of Neisseria gonorrhoeae to fluoroquinolones and other antimicrobial agents in Hyogo and Osaka, Japan. Sex Transm Infect 2004; 80:105-7. [PMID: 15054169 PMCID: PMC1744816 DOI: 10.1136/sti.2003.006908] [Citation(s) in RCA: 14] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVES Decreasing susceptibility of Neisseria gonorrhoeae to fluoroquinolones has been reported in several countries. Knowledge of local N gonorrhoeae susceptibilities to various antimicrobials is important for establishing a rational treatment strategy in each region. METHODS Isolates of N gonorrhoeae from male urethritis patients attending four urological clinics in Hyogo and Osaka prefectures in Japan were collected during 2002. The MICs for nine antimicrobials: penicillin G, tetracycline, cefixime, ceftriaxone, levofloxacin, gatifloxacin, ciprofloxacin, moxifloxacin, and spectinomycin were determined for each isolate. All isolates were also tested for beta lactamase producing profiles. RESULTS Among the 87 isolates obtained, only one isolate was revealed to produce beta lactamase. MIC90 values for ciprofloxacin, levofloxacin, gatifloxacin, and moxifloxacin were over 8 microg/ml, over 8 microg/ml, 4 microg/ml, and 2 microg/ml, respectively. The proportion of isolates resistant to fluoroquinolones was over 60% (ciprofloxacin, 70.1%; levofloxacin, 65.5%; gatifloxacin, 70.1%). Chromosomally mediated penicillin and tetracycline resistance was identified in 12.6% and 33.3% of the isolates. MIC90 values for cefixime and ceftriaxone and were 0.5 microg/ml and 0.0063 microg/ml. All isolates were sensitive to ceftriaxone and 90.8% of them were sensitive to cefixime. MIC90 for spectinomycin was 32 microg/ml and all isolates were sensitive to it. Fluoroquinolone resistance correlated significantly with MICs for penicillin G but not tetracycline. CONCLUSION Ceftriaxone and spectinomycin demonstrated lower MICs and so are recommended for N gonorrhoeae. Susceptibilities of N gonorrhoeae should be monitored periodically by region.
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Affiliation(s)
- K Shigemura
- Division of Urology, Department of Organs Therapeutics, Faculty of Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
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Gotoh A, Shirakawa T, Wada Y, Fujisawa M, Okada H, Kamidono S, Hamada K. The growth inhibitory effect of p21 adenovirus on androgen-dependent and -independent human prostate cancer cells. BJU Int 2003; 92:314-8. [PMID: 12887490 DOI: 10.1046/j.1464-410x.2003.04318.x] [Citation(s) in RCA: 12] [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: 11/20/2022]
Abstract
OBJECTIVE To assess the potential of p21 as a gene therapy treatment for prostate cancer, by introducing p21 into both androgen-dependent (AD) and -independent (AI) human prostate cancer cell lines via a recombinant adenoviral vector, Ad5CMV-p21, carrying human p21 cDNA. MATERIALS AND METHODS The LNCaP, DU145 and PC-3 human prostate cancer cell lines were cultured and infected with Ad5CMV-p21. Cell growth, cell-cycle progression and tumorigenicity were then assessed by thymidine incorporation into cellular DNA, and cell number, flow cytometry, and tumour growth after inoculating the cells into nude mice. RESULTS Growth was inhibited in Ad5CMV-p21 viral-infected AD and AI prostate cancer cells. The effects were dose-dependent, regardless of the androgen status of the cell lines. Flow cytometric analysis showed that Ad5CMV-p21 arrested cell-cycle progression at G1/S with no appreciable effect on the levels of apoptotic cells. The tumorigenicity of cancer cells infected with Ad5CMV-p21 was greatly reduced in athymic mice. CONCLUSIONS These results suggest that Ad5CMV-p21 may be a new therapeutic agent for human prostate cancer gene therapy.
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Affiliation(s)
- A Gotoh
- International Centre for Medical Research and Department of Urology, Kobe University School of Medicine, Kobe, Japan.
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Shirakawa T, Gotoh A, Wada Y, Kamidono S, Ko SC, Kao C, Gardner TA, Chung LW. Tissue-specific promoters in gene therapy for the treatment of prostate cancer. Mol Urol 2002; 4:73-82. [PMID: 12006246 DOI: 10.1089/10915360050138620] [Citation(s) in RCA: 20] [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: 11/12/2022]
Abstract
Delivery of therapeutic toxic genes to and their expression in tumor cells through the use of tissue-specific promoters could decrease their toxic effect on neighboring normal cells when virus-mediated gene delivery results in their infection. We have demonstrated the utility of two prostate cancer-specific promoters, long PSA and osteocalcin, for tissue-specific toxic gene therapy for prostate cancer. The two promoters were highly active in both androgen-dependent and androgen-independent prostate cancer cells. We also introduce the Phase I trial of osteocalcin promoter-based toxic gene therapy for bone metastases of prostate cancer, which is in progress at the University of Virginia.
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Affiliation(s)
- T Shirakawa
- Department of Urology, Kobe University School of Medicine, Kobe, Japan.
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Funato K, Miyazawa K, Yaguchi M, Gotoh A, Ohyashiki K. Combination of 22-oxa-1,25-dihydroxyvitamin D(3), a vitamin D(3) derivative, with vitamin K(2) (VK2) synergistically enhances cell differentiation but suppresses VK2-inducing apoptosis in HL-60 cells. Leukemia 2002; 16:1519-27. [PMID: 12145693 DOI: 10.1038/sj.leu.2402614] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2001] [Accepted: 04/17/2002] [Indexed: 11/09/2022]
Abstract
We originally reported that vitamin K(2) (VK2) effectively induces apoptosis in various types of primary cultured leukemia cells and leukemia cell lines in vitro. In addition, VK2 was shown to induce differentiation of leukemia cells when the cells were resistant against VK2-inducing apoptosis. A novel synthetic vitamin D(3)derivative, 22-oxa-1,25-dihydroxyvitamin D(3) (OCT: oxacarcitriol) shows a more potent differentiation-inducing ability among myeloid leukemia cells in vitro with much lesser extent of the induction of hypercalcemia in vivo as compared to the effects of 1alpha,25(OH)(2)D(3). In the present study, we focused on the effects of a combination of OCT plus VK2 on leukemia cells. Treatment of HL-60 cells with OCT for 72 h induces monocytic differentiation. A combination of OCT plus VK2 dramatically enhances monocytic differentiation as assessed by morphologic features, positivity for non-specific esterase staining, and cell surface antigen expressions. This combined effect far exceeds the maximum differentiation induction ability at the optimal concentrations of either OCT or VK2 alone. In addition, pronounced accumulation of the cells in the G0/G1 phase is observed by combined treatment with OCT plus VK2 as compared with each vitamin alone. In contrast to cell differentiation, caspase-3 activation and apoptosis induction in response to VK2 are significantly suppressed in the presence of OCT in HL-60 cells. These data suggest that monocytic differentiation and apoptosis induction of HL-60 cells are inversely regulated. Furthermore, pronounced induction of differentiation by combined treatment with VK2 plus OCT was also observed in four out of six cases of primary cultured acute myeloid leukemia cells in vitro, suggesting that VK2 plus OCT might be a potent combination for the differentiation-based therapy for acute myeloid leukemias.
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Affiliation(s)
- K Funato
- First Department of Internal Medicine (Hematology/Oncology), Tokyo Medical University, Tokyo, Japan
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Abstract
BACKGROUND AND PURPOSE Bladder cancer is common. Current treatment for patients with superficial bladder cancer involves transurethral resection followed by adjuvant bacillus Calmette-Guérin (BCG) administration. Adjuvant BCG has been reported to be effective in 38% to 68% of patients; however, more than 30% of patients do not respond. Because p53 mutations are common among superficial bladder cancers, we tested the feasibility of using p53 as a gene therapy agent for targeting superficial tumors, which are easily accessible using an intravesical approach. MATERIALS AND METHODS Wild-type p53 was transduced into various human and murine bladder cancer cell lines (HTB9, KU-1, and MBT-2) using a recombinant adenoviral vector (Ad5CMV-p53) in vitro. Also, subcutaneous tumors were established and then treated with intratumoral injection of Ad5CMV-p53 or control viruses. RESULTS In vitro assays revealed significant growth suppression of target cells by Ad5CMV-p53 in comparison with those receiving the control Ad5-CMV-PA vector or untreated control cells. In vivo studies using subcutaneous bladder tumor models established in syngeneic mice demonstrated that the rate of tumor growth and volume was reduced to a greater extent by 14 days of intratumoral injection of Ad5CMV-p53 rather than Ad5CMV-PA. Furthermore, the survival of host animals bearing tumors that were infected with Ad5CMV-p53 was significantly longer than that of the control group treated with Ad5CMV-PA (P < 0.01). CONCLUSION Our data suggest that Ad5CMV-p53 is effective in suppressing bladder cancer growth and improving host survival.
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Affiliation(s)
- Y Wada
- Department of Urology, Kobe University School of Medicine, Kobe, Japan.
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Hara I, Miyake H, Hara S, Gotoh A, Nakamura I, Okada H, Arakawa S, Kamidono S. Health-related quality of life after radical cystectomy for bladder cancer: a comparison of ileal conduit and orthotopic bladder replacement. BJU Int 2002; 89:10-3. [PMID: 11849152 DOI: 10.1046/j.1464-4096.2001.01475.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To compare the health-related quality of life (HRQoL) after radical cystectomy in patients with an ileal conduit or an orthotopic neobladder. PATIENTS AND METHODS The study included 85 men who underwent radical cystectomy for bladder cancer, comprising 48 with an orthotopic neobladder (26 with an ileal and 22 with a colon neobladder) and 37 with an ileal conduit. HRQoL was evaluated using the Short Form-36 survey containing 36 questions assessing eight aspects, including physical functioning, role-physical functioning, bodily pain, general health, vitality, social functioning, role-emotional functioning and mental health. RESULTS The mean follow-up periods for patients with a neobladder (ileal and sigmoid) and with an ileal conduit was 45.9 (38.2 and 53.1, respectively) and 130.9 months, respectively. Scale scores were not affected by the duration of follow-up in either group. There was no significant difference in any scale scores between the neobladder and ileal conduit groups. However, general health and social functioning in both the neobladder and ileal conduit groups appeared to be significantly lower than those in the general population in the USA. Furthermore, patients with a colon neobladder had a significantly higher score for role-emotional functioning than those with an ileal neobladder, while there was no significant difference in the remaining seven scores between patients with ileal and colon neobladders. CONCLUSIONS Six of the eight scales of HRQoL were favourable in both patients with a neobladder or an ileal conduit, and there was no significant difference between these groups. In addition, the HRQoL of patients with an orthotopic neobladder (except for role-emotional functioning) was unaffected by the segment of the intestine used for neobladder construction. Therefore, patients with both types of urinary diversion were generally satisfied with their overall health and quality of life.
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Affiliation(s)
- I Hara
- Department of Urology, Kobe University School of Medicine, Kobe, Japan.
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Sasaki R, Shirakawa T, Zhang ZJ, Tamekane A, Matsumoto A, Sugimura K, Matsuo M, Kamidono S, Gotoh A. Additional gene therapy with Ad5CMV-p53 enhanced the efficacy of radiotherapy in human prostate cancer cells. Int J Radiat Oncol Biol Phys 2001; 51:1336-45. [PMID: 11728695 DOI: 10.1016/s0360-3016(01)01803-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
PURPOSE The aim of this study was to investigate the efficacy of combination therapy of ionizing radiation (IR) and adenoviral p53 gene therapy and to evaluate its molecular mechanisms. METHODS AND MATERIALS Two human prostate cancer cell lines, DU145 and PC-3 cells, containing different types of p53 gene mutations, were investigated. The recombinant adenovirus vector containing the wild-type p53 gene (Ad5CMV-p53) was used for this study. Cells were irradiated (in 0, 2, 4, and 6 Gy, 300 cGy/min) and after 12 h of irradiation, the cells were infected with various doses of Ad5CMV-p53 (0-40 multiplicity of infection [MOI]). Cytotoxicity was determined by clonogenic assay. The molecular mechanisms were evaluated by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR), apoptotic cell detection, and cell cycle analysis. RESULTS The cell growth inhibition in DU145 (p53-mutated) cells by IR was strongly enhanced by additional Ad5CMV-p53 infection in a viral dose-dependent manner. In DU145 cells, IR alone induced minimal p53 mRNA expression. However, IR combined with Ad5CMV-p53 infection stimulated significant increase in p53 mRNA expression supplemented with Bax and p21 mRNA expressions. In PC-3 (p53-null), IR induced Bax and p21 mRNA expression, while the combination effects were observed in p53, Bax, and p21 mRNA expression. Apoptotic cell deaths were rarely observed after IR alone (DU145: 3%, PC-3: 5%). However, after combination therapy, the proportion of apoptotic cells greatly increased (sevenfold in DU145 cells, and twice in PC-3 cells). G1 cell cycle arrest was observed after Ad5CMV-p53 infection and the combination in both cell lines. CONCLUSION In this study, we demonstrated that the combination of IR and Ad5CMV-p53 gene therapy resulted in remarkable synergistic effects in human prostate cancer cells. This combination therapy could be one of the optimal treatment strategies for radioresistant prostate cancer.
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Affiliation(s)
- R Sasaki
- Department of Radiology, Kobe University School of Medicine, Hyogo, Kobe City, Japan
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Kawabata G, Hara I, Hara S, Isotani S, Sakai Y, Wada Y, Miyake H, Gotoh A, Chokyu H, Fujisawa M, Okada H, Kamidono S, Arakawa S. [Laparoscopic radical prostatectomy: initial 17 case report]. Nihon Hinyokika Gakkai Zasshi 2001; 92:647-55. [PMID: 11766363 DOI: 10.5980/jpnjurol1989.92.647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 04/17/2023]
Abstract
PURPOSE We report our early experience of laparoscopic radical prostatectomy for clinically localized prostatic cancer. MATERIAL AND METHOD Between April and December 2000, 17 patients with clinical stage T1c to T2b prostatic cancer underwent laparoscopic radical prostatectomy. The median age was 70.9 year old, the median preoperative PSA and the median Gleason score of biopsy specimens was 7.1 ng/ml, 6, respectively. We followed the operation technique from the "Montsouris technique". Briefly, we used five trocars (two 10-mm and three 5-mm trocars) and the operation was performed transperitoneally. Pelvic lymph node dissection was performed in only one patient (case 3). Urethrovesical anastomosis was performed with 6 to 9 interrupted 3-0 absorbable sutures. RESULTS No conversion to open surgery or reoperation was required in all cases. Median operation time was 450 minutes (range 290 to 750) and median intraoperative bleeding (including urine) was 600 ml (range 100 to 3,135). Only one case (case 3) needed homologous blood transfusion. Median postoperative Foley catheterization period was 9 days (range 5 to 19). Intraoperative complications related to operation procedure were one rectal injury and three vesical injuries, which were treated by absorbable suturing laparoscopically. Major complication was one complete A-V block (case 3) who was required a transient discontinuance of the procedure. Surgical margins were negative in 13 cases. Postoperative pathological evaluation was one pT0, five pT2a, seven pT2b and four pT3a. PSA value decreased less than 0.2 ng/ml after surgery in all patients. Although six months have passed after the surgery in only 4 patients, all of them were fully continent. CONCLUSION Although the operation time is still longer than that of conventional open procedures, intraoperative magnified vision allows a more precise and safer dissection, especially for apical dissection. We believe that operative time will decrease with more experience. These results show that laparoscopic radical prostatectomy can be an acceptable treatment option for localized prostatic cancer.
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Affiliation(s)
- G Kawabata
- Division of Urology, Department of Organs Therapeutics, Faculty of Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
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