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Morita M, Nambu T, Yamasaki R, Nagai-Yoshioka Y, Inoue M, Nishihara T, Okinaga T, Ariyoshi W. Characterization of oral microbiota in 6-8-month-old small breed dogs. BMC Vet Res 2024; 20:138. [PMID: 38580990 PMCID: PMC10996209 DOI: 10.1186/s12917-024-03973-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 03/13/2024] [Indexed: 04/07/2024] Open
Abstract
BACKGROUND Periodontitis is the most common oral disease in dogs, and its progression and severity are influenced by risk factors, such as age and body size. Recent studies have assessed the canine oral microbiota in relation to different stages of periodontitis and niches within the oral cavity. However, knowledge of the bacterial composition at different ages and body sizes, especially in puppies, is limited. This study aimed to characterize the oral microbiota in the healthy gingiva of small breed puppies using next-generation sequencing. Additionally, we assessed the impact of dental care practices and the presence of retained deciduous teeth on the oral microbiota. RESULTS In this study, plaque samples were collected from the gingival margin of 20 small breed puppies (age, 6.9 ± 0.6 months). The plaque samples were subjected to next-generation sequencing targeting the V3-V4 region of the 16 S rRNA. The microbiota of the plaque samples was composed mostly of gram-negative bacteria, primarily Proteobacteria (54.12%), Bacteroidetes (28.79%), and Fusobacteria (5.11%). Moraxella sp. COT-017, Capnocytophaga cynodegmi COT-254, and Bergeyella zoohelcum COT-186 were abundant in the oral cavity of the puppies. In contrast, Neisseria animaloris were not detected. The high abundance of Pasteurellaceae suggests that this genus is characteristic of the oral microbiota in puppies. Dental care practices and the presence of retained deciduous teeth showed no effects on the oral microbiota. CONCLUSIONS In this study, many bacterial species previously reported to be detected in the normal oral cavity of adult dogs were also detected in 6-8-month-old small breed dogs. On the other hand, some bacterial species were not detected at all, while others were detected in high abundance. These data indicate that the oral microbiota of 6-8-month-old small breed dogs is in the process of maturating in to the adult microbiota and may also have characteristics of the small dog oral microbiota.
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Affiliation(s)
- Masahiro Morita
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan
- Saki Animal Hospital, 1-19-33, Mukaino, Minami-ku, Fukuoka, 815-0035, Japan
| | - Takayuki Nambu
- Department of Bacteriology, Osaka Dental University, 8-1, Kuzuha-Hanazono, Hirakata, Osaka, 573-1121, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Yoshie Nagai-Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Maki Inoue
- Dental Center for Regional Medical Survey, Kyushu Dental University, 2-6- 1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Tatsuji Nishihara
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan
- Dental Center for Regional Medical Survey, Kyushu Dental University, 2-6- 1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Toshinori Okinaga
- Department of Bacteriology, Osaka Dental University, 8-1, Kuzuha-Hanazono, Hirakata, Osaka, 573-1121, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka, 803-8580, Japan.
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Takada K, Nakano S, Nishio R, Muku D, Mochizuki S, Inui I, Okita K, Koga A, Watanabe K, Yoshioka Y, Ariyoshi W, Yamasaki R. Medicinal herbs, especially Hibiscus sabdariffa, inhibit oral pathogenic bacteria. J Oral Biosci 2024; 66:179-187. [PMID: 38278302 DOI: 10.1016/j.job.2024.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 01/14/2024] [Accepted: 01/15/2024] [Indexed: 01/28/2024]
Abstract
OBJECTIVES Medicinal herbs are plants with potential medicinal and health benefits. In recent years, they are being increasingly used as a treatment alternative owing to their effectiveness against various diseases. In this study, we investigated the inhibitory effects of 15 medicinal herbs on causative bacteria for dental caries and periodontal disease. METHODS This study evaluated the effects of the extracts of 15 medicinal herbs on growth and biofilm formation in five oral pathogenic bacterial strains. The herbs were processed into extracts, and bacterial strains were cultured. Then, bacterial growth and biofilm formation were assessed using various methods. Finally, the extract of the herb Hibiscus sabdariffa (hibiscus) was analyzed using high-performance liquid chromatography. RESULTS Incubation of bacteria with the herbal extracts showed that hibiscus exerted a significant inhibitory effect on all the oral pathogenic bacterial strains evaluated in this study. In addition, the pigment delphinidin-3-sambubioside, which is found in hibiscus extract, was identified as a particularly important inhibitory component. CONCLUSIONS These results lay the ground work for the potential development of novel therapeutic or preventive agents against dental caries and periodontal disease, two major oral diseases.
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Affiliation(s)
- Kazuya Takada
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan; Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Shizuki Nakano
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Reina Nishio
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Daichi Muku
- Department of Chemistry and Biochemistry, The University of Kitakyushu, Kitakyushu, Fukuoka, 808-0135, Japan
| | - Shinichi Mochizuki
- Department of Chemistry and Biochemistry, The University of Kitakyushu, Kitakyushu, Fukuoka, 808-0135, Japan
| | - Inori Inui
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Kaede Okita
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Ayaka Koga
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Koji Watanabe
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Yoshie Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan; Collaborative Research Centre for Green Materials on Environmental Technology, Kyushu Institute of Technology, Kitakyushu, Fukuoka, 804-8550, Japan.
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Yamasaki R, Rajan R, Matsumura K. Enhancement of cryopreservation with intracellularly permeable zwitterionic polymers. Chem Commun (Camb) 2023; 59:14001-14004. [PMID: 37941405 DOI: 10.1039/d3cc04092e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
A novel copolymer containing zwitterionic and methylsulfinyl structures was developed, which enhanced cryoprotective efficacy by enabling intracellular cytoplasmic permeation without relying on mediated endocytosis and diffused out of the cells within approximately 30 min, making it more advantageous than polymeric nanoparticles for the transport of membrane-impermeable cryoprotectants such as trehalose.
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Affiliation(s)
- Ryota Yamasaki
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
| | - Robin Rajan
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
| | - Kazuaki Matsumura
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
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Ikeda-Motonakano R, Hirabayashi-Nishimuta F, Yada N, Yamasaki R, Nagai-Yoshioka Y, Usui M, Nakazawa K, Yoshiga D, Yoshioka I, Ariyoshi W. Fabrication of a Three-Dimensional Spheroid Culture System for Oral Squamous Cell Carcinomas Using a Microfabricated Device. Cancers (Basel) 2023; 15:5162. [PMID: 37958336 PMCID: PMC10649954 DOI: 10.3390/cancers15215162] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/21/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Cancer stem cells (CSCs) are considered to be responsible for recurrence, metastasis, and resistance to treatment in many types of cancers; therefore, new treatment strategies targeting CSCs are attracting attention. In this study, we fabricated a polyethylene glycol-tagged microwell device that enabled spheroid formation from human oral squamous carcinoma cells. HSC-3 and Ca9-22 cells cultured in the microwell device aggregated and generated a single spheroid per well within 24-48 h. The circular shape and smooth surface of spheroids were maintained for up to five days, and most cells comprising the spheroids were Calcein AM-positive viable cells. Interestingly, the mRNA expression of CSC markers (Cd44, Oct4, Nanog, and Sox2) were significantly higher in the spheroids than in the monolayer cultures. CSC marker-positive cells were observed throughout the spheroids. Moreover, resistance to cisplatin was enhanced in spheroid-cultured cells compared to that in the monolayer-cultured cells. Furthermore, some CSC marker genes were upregulated in HSC-3 and Ca9-22 cells that were outgrown from spheroids. In xenograft model, the tumor growth in the spheroid implantation group was comparable to that in the monolayer culture group. These results suggest that our spheroid culture system may be a high-throughput tool for producing uniform CSCs in large numbers from oral cancer cells.
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Affiliation(s)
- Reiko Ikeda-Motonakano
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.I.-M.); (R.Y.); (Y.N.-Y.)
- Division of Oral Medicine, Department of Science of Physical Function, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (F.H.-N.); (D.Y.); (I.Y.)
| | - Fumika Hirabayashi-Nishimuta
- Division of Oral Medicine, Department of Science of Physical Function, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (F.H.-N.); (D.Y.); (I.Y.)
| | - Naomi Yada
- Division of Oral Pathology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan;
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.I.-M.); (R.Y.); (Y.N.-Y.)
| | - Yoshie Nagai-Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.I.-M.); (R.Y.); (Y.N.-Y.)
| | - Michihiko Usui
- Division of Periodontology, Department of Oral Function, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan;
| | - Kohji Nakazawa
- Department of Life and Environment Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0135, Japan;
| | - Daigo Yoshiga
- Division of Oral Medicine, Department of Science of Physical Function, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (F.H.-N.); (D.Y.); (I.Y.)
| | - Izumi Yoshioka
- Division of Oral Medicine, Department of Science of Physical Function, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (F.H.-N.); (D.Y.); (I.Y.)
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.I.-M.); (R.Y.); (Y.N.-Y.)
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Noguchi S, Yamasaki R, Nagai-Yoshioka Y, Sato T, Kuroishi K, Gunjigake K, Ariyoshi W, Kawamoto T. The Mechanism of Interleukin 33-Induced Stimulation of Interleukin 6 in MLO-Y4 Cells. Int J Mol Sci 2023; 24:14842. [PMID: 37834290 PMCID: PMC10573633 DOI: 10.3390/ijms241914842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/22/2023] [Accepted: 09/29/2023] [Indexed: 10/15/2023] Open
Abstract
The differentiation and function of osteocytes are controlled by surrounding cells and mechanical stress; however, the detailed mechanisms are unknown. Recent findings suggest that IL-33 is highly expressed in periodontal tissues in orthodontic tooth movement. The present study aimed to elucidate the effect of IL-33 on the expression of regulatory factors for bone remodeling and their molecular mechanisms in the osteocyte-like cell line MLO-Y4. MLO-Y4 cells were treated with IL-33, and the activation of intracellular signaling molecules and transcriptional factors was determined using Western blot analysis and chromatin immunoprecipitation assay. IL-33 treatment enhanced the expression of IL-6 in MLO-Y4 cells, which was suppressed by the knockdown of the IL-33 receptor ST2L. Additionally, IL-33 treatment induced activation of NF-κB, JNK/AP-1, and p38 MAPK signaling pathways in MLO-Y4 cells. Moreover, pretreatment with specific inhibitors of NF-κB, p38 MAPK, and JNK/AP-1 attenuated the IL-33-induced expression of IL-6. Furthermore, chromatin immunoprecipitation indicated that IL-33 increased c-Jun recruitment to the IL-6 promoter. Overall, these results suggest that IL-33 induces IL-6 expression and regulates osteocyte function via activation of the NF-κB, JNK/AP-1, and p38 MAPK pathways through interaction with ST2L receptors on the plasma membrane.
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Affiliation(s)
- Sae Noguchi
- Division of Orofacial Functions and Orthodontics, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (S.N.); (K.K.); (K.G.); (T.K.)
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.Y.); (Y.N.-Y.)
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.Y.); (Y.N.-Y.)
| | - Yoshie Nagai-Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.Y.); (Y.N.-Y.)
| | - Tsuyoshi Sato
- Department of Oral and Maxillofacial Surgery, Saitama Medical University, 38 Moro-hongou, Moroyama-machi, Iruma-gun, Saitama 350-0495, Japan;
| | - Kayoko Kuroishi
- Division of Orofacial Functions and Orthodontics, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (S.N.); (K.K.); (K.G.); (T.K.)
| | - Kaori Gunjigake
- Division of Orofacial Functions and Orthodontics, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (S.N.); (K.K.); (K.G.); (T.K.)
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (R.Y.); (Y.N.-Y.)
| | - Tatsuo Kawamoto
- Division of Orofacial Functions and Orthodontics, Kyushu Dental University, 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka 803-8580, Japan; (S.N.); (K.K.); (K.G.); (T.K.)
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Okita K, Hikiji H, Koga A, Nagai-Yoshioka Y, Yamasaki R, Mitsugi S, Fujii W, Ariyoshi W. Ascorbic acid enhances chondrocyte differentiation of ATDC5 by accelerating insulin receptor signaling. Cell Biol Int 2023; 47:1737-1748. [PMID: 37381608 DOI: 10.1002/cbin.12067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 05/06/2023] [Accepted: 06/20/2023] [Indexed: 06/30/2023]
Abstract
Chondrogenesis is strictly regulated by several factors, including cytokines, hormones, and extracellular matrix proteins. Mouse teratocarcinoma-derived lineage cells, differentiate into chondrocytes in the presence of insulin. Although ascorbic acid promotes chondrogenic differentiation, the detailed regulative mechanisms underlying its role in chondrogenesis remain unclear. Therefore, in this study, we evaluated the effects of ascorbic acid on insulin-induced chondrogenic differentiation of ATDC5 cells and the underlying intracellular signaling. The results revealed that insulin-stimulated collagen deposition, matrix formation, calcification, and expression of chondrogenic differentiation marker genes in ATDC5 cells. This enhancement by insulin was amplified with the addition of ascorbic acid. Molecular analysis revealed that the activation of insulin-induced phosphoinositide 3-kinase (PI3K)/Akt signaling was enhanced in the presence of ascorbic acid. In contrast, Wnt/β-catenin signaling was suppressed during chondrocyte differentiation via upregulation of the Wnt agonist, secreted Frizzled-related protein 1 (sFRP-1) and 3 (sFRP-3). Notably, ascorbic acid upregulated the expression of insulin receptors and their substrates (IRS-1 and IRS-2). Furthermore, ascorbic acid reversed the suppression of IRS-1 and IRS-2 protein by insulin. These results indicate that ascorbic acid positively regulates the chondrogenic differentiation of ATDC5 cells via enhancement of insulin signaling. Our findings provide a substantial basis for further elucidation of the regulatory mechanisms of chondrocyte differentiation and the pathophysiology of OA, thus aiding in development of effective treatment strategies.
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Affiliation(s)
- Kaede Okita
- Department of Health Promotion, Division of Infections and Molecular Biology, Kyushu Dental University, Fukuoka, Japan
- School of Oral Health Sciences, Faculty of Dentistry, Kyushu Dental University, Fukuoka, Japan
| | - Hisako Hikiji
- School of Oral Health Sciences, Faculty of Dentistry, Kyushu Dental University, Fukuoka, Japan
| | - Ayaka Koga
- Department of Health Promotion, Division of Infections and Molecular Biology, Kyushu Dental University, Fukuoka, Japan
- School of Oral Health Sciences, Faculty of Dentistry, Kyushu Dental University, Fukuoka, Japan
| | - Yoshie Nagai-Yoshioka
- Department of Health Promotion, Division of Infections and Molecular Biology, Kyushu Dental University, Fukuoka, Japan
| | - Ryota Yamasaki
- Department of Health Promotion, Division of Infections and Molecular Biology, Kyushu Dental University, Fukuoka, Japan
| | - Sho Mitsugi
- Department of Science of Physical Functions, Division of Oral and Maxillofacial Surgery, Kyushu Dental University, Fukuoka, Japan
| | - Wataru Fujii
- School of Oral Health Sciences, Faculty of Dentistry, Kyushu Dental University, Fukuoka, Japan
| | - Wataru Ariyoshi
- Department of Health Promotion, Division of Infections and Molecular Biology, Kyushu Dental University, Fukuoka, Japan
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Nakamura Y, Watanabe K, Yoshioka Y, Ariyoshi W, Yamasaki R. Persister Cell Formation and Elevated lsrA and lsrC Gene Expression upon Hydrogen Peroxide Exposure in a Periodontal Pathogen Aggregatibacter actinomycetemcomitans. Microorganisms 2023; 11:1402. [PMID: 37374903 DOI: 10.3390/microorganisms11061402] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/23/2023] [Accepted: 05/25/2023] [Indexed: 06/29/2023] Open
Abstract
The effect of hydrogen peroxide, an antiseptic dental treatment, on Aggregatibacter actinomycetemcomitans, the main causative agent of localized invasive periodontitis, was investigated. Hydrogen peroxide treatment (0.06%, 4× minimum inhibitory concentration) resulted in the persistence and survival of approximately 0.5% of the bacterial population. The surviving bacteria did not genetically acquire hydrogen peroxide resistance but exhibited a known persister behavior. Sterilization with mitomycin C significantly reduced the number of A. actinomycetemcomitans persister survivors. RNA sequencing of hydrogen peroxide-treated A. actinomycetemcomitans showed elevated expression of Lsr family members, suggesting a strong involvement of autoinducer uptake. In this study, we found a risk of A. actinomycetemcomitans persister residual from hydrogen peroxide treatment and hypothesized associated genetic mechanisms of persister from RNA sequencing.
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Affiliation(s)
- Yohei Nakamura
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Koji Watanabe
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Yoshie Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
- Collaborative Research Centre for Green Materials on Environmental Technology, Kyushu Institute of Technology, 1-1 Sensui-chou, Tobata-ku, Kitakyushu 804-8550, Fukuoka, Japan
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8
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Koga A, Thongsiri C, Kudo D, Phuong DND, Iwamoto Y, Fujii W, Nagai-Yoshioka Y, Yamasaki R, Ariyoshi W. Mechanisms Underlying the Suppression of IL-1β Expression by Magnesium Hydroxide Nanoparticles. Biomedicines 2023; 11:biomedicines11051291. [PMID: 37238962 DOI: 10.3390/biomedicines11051291] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
In recent years, magnesium hydroxide has been widely studied due to its bioactivity and biocompatibility. The bactericidal effects of magnesium hydroxide nanoparticles on oral bacteria have also been reported. Therefore, in this study, we investigated the biological effects of magnesium hydroxide nanoparticles on inflammatory responses induced by periodontopathic bacteria. Macrophage-like cells, namely J774.1 cells, were treated with LPS derived from Aggregatibacter actinomycetemcomitans and two different sizes of magnesium hydroxide nanoparticles (NM80/NM300) to evaluate their effects on the inflammatory response. Statistical analysis was performed using an unresponsive Student's t-test or one-way ANOVA followed by Tukey's post hoc test. NM80 and NM300 inhibited the expression and secretion of IL-1β induced by LPS. Furthermore, IL-1β inhibition by NM80 was dependent on the downregulation of PI3K/Akt-mediated NF-κB activation and the phosphorylation of MAPK molecules such as JNK, ERK1/2, and p38 MAPK. By contrast, only the deactivation of the ERK1/2-mediated signaling cascade is involved in IL-1β suppression by NM300. Although the molecular mechanism involved varied with size, these results suggest that magnesium hydroxide nanoparticles have an anti-inflammatory effect against the etiologic factors of periodontopathic bacteria. These properties of magnesium hydroxide nanoparticles can be applied to dental materials.
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Affiliation(s)
- Ayaka Koga
- Department of Health Sciences, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Chuencheewit Thongsiri
- Department of Conservative Dentistry and Prosthodontics, Srinakharinwirot University, Bangkok 10110, Thailand
| | - Daisuke Kudo
- SETOLAS Holdings Inc., Sakaide 762-0012, Kagawa, Japan
| | | | | | - Wataru Fujii
- Unit of Interdisciplinary Promotion, School of Oral Health Sciences, Faculty of Dentistry, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Yoshie Nagai-Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu 803-8580, Fukuoka, Japan
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9
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Okamoto K, Kudo D, Phuong DND, Iwamoto Y, Watanabe K, Yoshioka Y, Ariyoshi W, Yamasaki R. Magnesium Hydroxide Nanoparticles Inhibit the Biofilm Formation of Cariogenic Microorganisms. Nanomaterials (Basel) 2023; 13:nano13050864. [PMID: 36903742 PMCID: PMC10005196 DOI: 10.3390/nano13050864] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/24/2023] [Accepted: 02/24/2023] [Indexed: 06/01/2023]
Abstract
Although various caries-preventive agents have been developed, dental caries is still a leading global disease, mostly caused by biological factors such as mutans streptococci. Magnesium hydroxide nanoparticles have been reported to exhibit antibacterial effects; however, they are rarely used in oral care practical applications. In this study, we examined the inhibitory effect of magnesium hydroxide nanoparticles on biofilm formation by Streptococcus mutans and Streptococcus sobrinus-two typical caries-causing bacteria. Three different sizes of magnesium hydroxide nanoparticles (NM80, NM300, and NM700) were studied, all of which inhibited biofilm formation. The results showed that the nanoparticles were important for the inhibitory effect, which was not influenced by pH or the presence of magnesium ions. We also determined that the inhibition process was mainly contact inhibition and that medium (NM300) and large (NM700) sizes were particularly effective in this regard. The findings of our study demonstrate the potential applications of magnesium hydroxide nanoparticles as caries-preventive agents.
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Affiliation(s)
- Kentaro Okamoto
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka 803-8580, Japan
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka 803-8580, Japan
| | - Daisuke Kudo
- SETOLAS Holdings Inc., Hayashida-cho, Sakaide, Kagawa 762-0012, Japan
| | | | - Yoshihito Iwamoto
- SETOLAS Holdings Inc., Hayashida-cho, Sakaide, Kagawa 762-0012, Japan
| | - Koji Watanabe
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka 803-8580, Japan
| | - Yoshie Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka 803-8580, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka 803-8580, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka 803-8580, Japan
- Collaborative Research Centre for Green Materials on Environmental Technology, Kyushu Institute of Technology, 1-1 Sensui-chou, Tobata-ku, Kitakyushu, Fukuoka 804-8550, Japan
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10
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Murayama A, Kamamoto S, Murata N, Yamasaki R, Yamada K, Yamashita E, Saito H, Tanimoto T, Ozaki A. Evaluation of financial conflicts of interest and quality of evidence in Japanese gastroenterology clinical practice guidelines. J Gastroenterol Hepatol 2022; 38:565-573. [PMID: 36518089 DOI: 10.1111/jgh.16089] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 11/02/2022] [Accepted: 12/11/2022] [Indexed: 12/30/2022]
Abstract
BACKGROUND Clinical practice guidelines assist healthcare professionals in providing evidence-based care. However, pharmaceutical companies' financial interests often influence guideline content. This study aimed to elucidate the magnitude of financial ties among Japanese gastroenterology guideline authors and the pharmaceutical industry. METHODS Using pharmaceutical company disclosed payment data, we evaluated financial conflicts of interest (COI) among Japanese Society of Gastroenterology guideline authors between 2016 and 2021. Additionally, we assessed the evidence quality supporting guideline recommendations and associations with financial COI. Finally, we evaluated author COI management during guideline development against global standards. RESULTS Overall, 88.2% (231/262) of guideline authors received a median of $12 968 (interquartile range [IQR]: $1839-$70 374) in payments between 2016 and 2019 for lectures, writings, and consulting. Chairpersons received significantly higher payments (median: $86 444 [IQR: $15 455-$165 679]). Notably, 41 (15.6%) authors had undeclared payments exceeding declaration requirements. Low or very low-quality evidence supported 41.0% of recommendations. There was a negative association between the median 4-year payment per author and the proportion of recommendations based on low-quality evidence (odds ratio: 0.966 [95% confidence interval [95% CI]: 0.945-0.987], P = 0.002) and positive association with moderate-quality evidence (odds ratio: 1.018 [95% CI: 1.011-1.025], P < 0.001). Still, the Japanese Society of Gastroenterology guideline development process remains less transparent, with insufficient COI policies relative to global standards. CONCLUSION There were extensive financial COI between pharmaceutical companies and guideline authors, and more than 40% of recommendations were based on low-quality evidence. More rigorous and transparent COI policies for guideline development adhering to global standards are warranted.
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Affiliation(s)
- Anju Murayama
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,School of Medicine, Tohoku University, Sendai, Miyagi, Japan
| | - Sae Kamamoto
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,Faculty of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Nanami Murata
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,Faculty of Medicine, Wakayama Medical University, Wakayama, Wakayama, Japan
| | - Ryota Yamasaki
- Faculty of Medicine, Wakayama Medical University, Wakayama, Wakayama, Japan
| | - Kohki Yamada
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,Osaka University School of Medicine, Osaka, Japan
| | - Erika Yamashita
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan
| | - Hiroaki Saito
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Miyagi, Japan
| | - Tetsuya Tanimoto
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,Department of Internal Medicine, Navitas Clinic, Tachikawa, Tokyo, Japan
| | - Akihiko Ozaki
- Medical Governance Research Institute, Minato-ku, Tokyo, Japan.,Department of Breast and Thyroid Surgery, Jyoban Hospital of Tokiwa Foundation, Iwaki, Fukushima, Japan
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11
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Inoue M, Nagai-Yoshioka Y, Yamasaki R, Kawamoto T, Nishihara T, Ariyoshi W. Mechanisms involved in suppression of osteoclast supportive activity by transforming growth factor-β1 via the ubiquitin-proteasome system. PLoS One 2022; 17:e0262612. [PMID: 35196318 PMCID: PMC8865688 DOI: 10.1371/journal.pone.0262612] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 12/28/2021] [Indexed: 11/18/2022] Open
Abstract
Orthodontic treatment requires the regulation of bone remodeling in both compression and tension sides. Transforming growth factor-β1 (TGF-β1) is an important coupling factor for bone remodeling. However, the mechanism underlying the TGF-β1-mediated regulation of the osteoclast-supporting activity of osteoblasts and stromal cells remain unclear. The current study investigated the effect of TGF-β1 on receptor activator of nuclear factor kappa-B ligand (RANKL) expression in stromal cells induced by 1α,25(OH)2D3 (D3) and dexamethasone (Dex). TGF-β1 downregulated the expression of RANKL induced by D3 and Dex in mouse bone marrow stromal lineage, ST2 cells. Co-culture system revealed that TGF-β1 suppressed osteoclast differentiation from bone marrow cell induced by D3 and Dex-activated ST2 cells. The inhibitory effect of TGF-β1 on RANKL expression was recovered by inhibiting the interaction between TGF-β1 and the TGF-β type I/activin receptor or by downregulating of smad2/3 expression. Interestingly, TGF-β1 degraded the retinoid X receptor (RXR)-α protein which forms a complex with vitamin D receptor (VDR) and regulates transcriptional activity of RANKL without affecting nuclear translocation of VDR and phosphorylation of signal transducer and activator of transcription3 (STAT3). The degradation of RXR-α protein by TGF-β1 was recovered by a ubiquitin-proteasome inhibitor. We also observed that poly-ubiquitination of RXR-α protein was induced by TGF-β1 treatment. These results indicated that TGF-β1 downregulates RANKL expression and the osteoclast-supporting activity of osteoblasts/stromal cells induced by D3 and Dex through the degradation of the RXR-α protein mediated by ubiquitin-proteasome system.
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Affiliation(s)
- Momoko Inoue
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
- Division of Orofacial Functions and Orthodontics, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - Yoshie Nagai-Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - Tatsuo Kawamoto
- Division of Orofacial Functions and Orthodontics, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - Tatsuji Nishihara
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
- * E-mail:
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12
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Okita K, Yamasaki R, Nakamura Y, Sakakura T, Kawano A, Takatsuji Y, Haruyama T, Yoshioka Y, Ariyoshi W. Quick and environmentally friendly sterilization process of dental instruments by radical vapor reactor. Process Biochem 2022. [DOI: 10.1016/j.procbio.2021.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Song S, Kim JS, Yamasaki R, Oh S, Benedik MJ, Wood TK. Escherichia coli cryptic prophages sense nutrients to influence persister cell resuscitation. Environ Microbiol 2021; 23:7245-7254. [PMID: 34668292 DOI: 10.1111/1462-2920.15816] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 10/07/2021] [Indexed: 11/28/2022]
Abstract
Cryptic prophages are not genomic junk but instead enable cells to combat myriad stresses as an active stress response. How these phage fossils affect persister cell resuscitation has, however, not been explored. Persister cells form as a result of stresses such as starvation, antibiotics and oxidative conditions, and resuscitation of these persister cells likely causes recurring infections such as those associated with tuberculosis, cystic fibrosis and Lyme disease. Deletion of each of the nine Escherichia coli cryptic prophages has no effect on persister cell formation. Strikingly, elimination of each cryptic prophage results in an increase in persister cell resuscitation with a dramatic increase in resuscitation upon deleting all nine prophages. This increased resuscitation includes eliminating the need for a carbon source and is due to activation of the phosphate import system resulting from inactivating the transcriptional regulator AlpA of the CP4-57 cryptic prophage. Deletion of alpA increases persister resuscitation, and AlpA represses phosphate regulator PhoR. Both phosphate regulators PhoP and PhoB stimulate resuscitation. This suggests a novel cellular stress mechanism controlled by cryptic prophages: regulation of phosphate uptake which controls the exit of the cell from dormancy and prevents premature resuscitation in the absence of nutrients.
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Affiliation(s)
- Sooyeon Song
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802-4400, USA.,Department of Animal Science, Jeonbuk National University, 587 Baekje-Daero, Deokjin-Gu, Jeonju-Si, Jeollabuk-Do, 54896, South Korea.,Department of Agricultural Convergence Technology, Jeonbuk National University, 587 Baekje-Daero, Deokjin-Gu, Jeonju-Si, Jeollabuk-Do, 54896, South Korea
| | - Jun-Seob Kim
- Department of Nano-Bioengineering, Incheon National University, 119 Academy-ro, Incheon, 22012, South Korea
| | - Ryota Yamasaki
- Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Sejong Oh
- Division of Animal Science, Chonnam National University, 77 Yongbong-Ro, Buk-Gu, Gwangju, 61186, South Korea
| | - Michael J Benedik
- Department of Biology, Texas A&M University, College Station, TX, 77843, USA
| | - Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802-4400, USA
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14
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Thongsiri C, Nagai-Yoshioka Y, Yamasaki R, Adachi Y, Usui M, Nakashima K, Nishihara T, Ariyoshi W. Schizophyllum commune β-glucan: Effect on interleukin-10 expression induced by lipopolysaccharide from periodontopathic bacteria. Carbohydr Polym 2021; 253:117285. [DOI: 10.1016/j.carbpol.2020.117285] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 10/08/2020] [Accepted: 10/18/2020] [Indexed: 12/20/2022]
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15
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Hara S, Nagai-Yoshioka Y, Yamasaki R, Adachi Y, Fujita Y, Watanabe K, Maki K, Nishihara T, Ariyoshi W. Dectin-1-mediated suppression of RANKL-induced osteoclastogenesis by glucan from baker's yeast. J Cell Physiol 2020; 236:5098-5107. [PMID: 33305824 DOI: 10.1002/jcp.30217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 04/01/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 12/31/2022]
Abstract
Immunoreceptors expressed on osteoclast precursor cells modify osteoclast differentiation and bone resorption activity. Dectin-1 is a lectin receptor of β-glucan and is specifically expressed in osteoclast precursor cells. In this study, we evaluated the bioactivity of β-glucan on receptor activator of nuclear factor-kappa B ligand (RANKL)-induced osteoclastogenesis and observed that glucan from baker's yeast inhibited this process in mouse bone marrow cells and dectin-1-overexpressing RAW264.7 (d-RAW) cells. In conjunction, RANKL-induced nuclear factor of activated T cell c1 expression was suppressed, subsequently downregulating TRAP and Oc-stamp. Additionally, nuclear factor-kappa B activation and the expression of c-fos and Blimp1 were reduced in d-RAW cells. Furthermore, glucan from baker's yeast induced the degradation of Syk protein, essential factor for osteoclastogenesis. These results suggest that glucan from baker's yeast suppresses RANKL-induced osteoclastogenesis and can be applied as a new treatment strategy for bone-related diseases.
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Affiliation(s)
- Shiika Hara
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan.,Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Yoshie Nagai-Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Yoshiyuki Adachi
- Laboratory for Immunopharmacology of Microbial Products, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan
| | - Yuko Fujita
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Kouji Watanabe
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Kenshi Maki
- Division of Developmental Stomatognathic Function Science, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | | | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
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16
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Yamasaki R, Kawano A, Yoshioka Y, Ariyoshi W. Rhamnolipids and surfactin inhibit the growth or formation of oral bacterial biofilm. BMC Microbiol 2020; 20:358. [PMID: 33228524 PMCID: PMC7684882 DOI: 10.1186/s12866-020-02034-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 11/05/2020] [Indexed: 12/16/2022] Open
Abstract
Background Bacteria survive in various environments by forming biofilms. Bacterial biofilms often cause significant problems to medical instruments and industrial processes. Techniques to inhibit biofilm formation are essential and have wide applications. In this study, we evaluated the ability of two types of biosurfactants (rhamnolipids and surfactin) to inhibit growth and biofilm formation ability of oral pathogenic bacteria such as Aggregatibacter actinomycetemcomitans, Streptococcus mutans, and Streptococcus sanguinis. Results Rhamnolipids inhibited the growth and biofilm formation ability of all examined oral bacteria. Surfactin showed effective inhibition against S. sanguinis ATCC10556, but lower effects toward A. actinomycetemcomitans Y4 and S. mutans UA159. To corroborate these results, biofilms were observed by scanning electron microscopy (SEM) and confocal microscopy. The observations were largely in concordance with the biofilm assay results. We also attempted to determine the step in the biofilm formation process that was inhibited by biosurfactants. The results clearly demonstrated that rhamnolipids inhibit biofilm formation after the initiation process, however, they do not affect attachment or maturation. Conclusions Rhamnolipids inhibit oral bacterial growth and biofilm formation by A. actinomycetemcomitans Y4, and may serve as novel oral drug against localized invasive periodontitis. Supplementary Information The online version contains supplementary material available at 10.1186/s12866-020-02034-9.
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Affiliation(s)
- Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan.
| | - Aki Kawano
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Yoshie Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
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17
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Kawano A, Yamasaki R, Sakakura T, Takatsuji Y, Haruyama T, Yoshioka Y, Ariyoshi W. Reactive Oxygen Species Penetrate Persister Cell Membranes of Escherichia coli for Effective Cell Killing. Front Cell Infect Microbiol 2020; 10:496. [PMID: 33042869 PMCID: PMC7530241 DOI: 10.3389/fcimb.2020.00496] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 09/12/2019] [Accepted: 08/10/2020] [Indexed: 02/05/2023] Open
Abstract
Persister cells are difficult to eliminate because they are tolerant to antibiotic stress. In the present study, using artificially induced Escherichia coli persister cells, we found that reactive oxygen species (ROS) have greater effects on persister cells than on exponential cells. Thus, we examined which types of ROS could effectively eliminate persister cells and determined the mechanisms underlying the effects of these ROS. Ultraviolet (UV) light irradiation can kill persister cells, and bacterial viability is markedly increased under UV shielding. UV induces the production of ROS, which kill bacteria by moving toward the shielded area. Electron spin resonance-based analysis confirmed that hydroxyl radicals are produced by UV irradiation, although singlet oxygen is not produced. These results clearly revealed that ROS sterilizes persister cells more effectively compared to the sterilization of exponential cells (**p < 0.01). These ROS do not injure the bacterial cell wall but rather invade the cell, followed by cell killing. Additionally, the sterilization effect on persister cells was increased by exposure to oxygen plasma during UV irradiation. However, vapor conditions decreased persister cell sterilization by reducing the levels of hydroxyl radicals. We also verified the effect of ROS against bacteria in biofilms that are more resistant than planktonic cells. Although UV alone could not completely sterilize the biofilm bacteria, UV with ROS achieved complete sterilization. Our results demonstrate that persister cells strongly resist the effects of antibiotics and starvation stress but are less able to withstand exposure to ROS. It was shown that ROS does not affect the cell membrane but penetrates it and acts internally to kill persister cells. In particular, it was clarified that the hydroxy radical is an effective sterilizer to kill persister cells.
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Affiliation(s)
- Aki Kawano
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
| | - Ryota Yamasaki
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
| | - Tatsuya Sakakura
- Division of Functional Interface Engineering, Department of Biological Systems and Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Yoshiyuki Takatsuji
- Division of Functional Interface Engineering, Department of Biological Systems and Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Tetsuya Haruyama
- Division of Functional Interface Engineering, Department of Biological Systems and Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Yoshie Yoshioka
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Kitakyushu, Japan
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18
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Yamasaki R, Song S, Benedik MJ, Wood TK. Persister Cells Resuscitate Using Membrane Sensors that Activate Chemotaxis, Lower cAMP Levels, and Revive Ribosomes. iScience 2020; 23:100792. [PMID: 31926430 PMCID: PMC6957856 DOI: 10.1016/j.isci.2019.100792] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 10/03/2019] [Accepted: 12/17/2019] [Indexed: 12/20/2022] Open
Abstract
Persistence, the stress-tolerant state, is arguably the most vital phenotype since nearly all cells experience nutrient stress, which causes a sub-population to become dormant. However, how persister cells wake to reconstitute infections is not understood well. Here, using single-cell observations, we determined that Escherichia coli persister cells resuscitate primarily when presented with specific carbon sources, rather than spontaneously. In addition, we found that the mechanism of persister cell waking is through sensing nutrients by chemotaxis and phosphotransferase membrane proteins. Furthermore, nutrient transport reduces the level of secondary messenger cAMP through enzyme IIA; this reduction in cAMP levels leads to ribosome resuscitation and rescue. Resuscitating cells also immediately commence chemotaxis toward nutrients, although flagellar motion is not required for waking. Hence, persister cells wake by perceiving nutrients via membrane receptors that relay the signal to ribosomes via the secondary messenger cAMP, and persisters wake and utilize chemotaxis to acquire nutrients.
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Affiliation(s)
- Ryota Yamasaki
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA
| | - Sooyeon Song
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA
| | - Michael J Benedik
- Department of Biology, Texas A & M University, College Station, TX 77843-3122, USA
| | - Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA; The Huck Institute of the Life Sciences, Pennsylvania State University, University Park, PA 16802-4400, USA.
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19
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Zhang W, Yamasaki R, Song S, Wood T. Interkingdom signal indole inhibits
Pseudomonas aeruginosa
persister cell waking. J Appl Microbiol 2019; 127:1768-1775. [DOI: 10.1111/jam.14434] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/26/2019] [Accepted: 08/16/2019] [Indexed: 12/14/2022]
Affiliation(s)
- W. Zhang
- Department of Chemical Engineering Pennsylvania State University University Park PA USA
| | - R. Yamasaki
- Department of Chemical Engineering Pennsylvania State University University Park PA USA
| | - S. Song
- Department of Chemical Engineering Pennsylvania State University University Park PA USA
| | - T.K. Wood
- Department of Chemical Engineering Pennsylvania State University University Park PA USA
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20
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Nakamura Y, Liu Z, Fukumoto S, Shinoda K, Sakoda A, Matsushita T, Hayashida S, Isobe N, Watanabe M, Hiwatashi A, Yamasaki R, Kira JI. Spinal cord involvement by atrophy and associations with disability are different between multiple sclerosis and neuromyelitis optica spectrum disorder. Eur J Neurol 2019; 27:92-99. [PMID: 31304648 DOI: 10.1111/ene.14038] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 06/18/2019] [Indexed: 01/07/2023]
Abstract
BACKGROUND AND PURPOSE The cervical and thoracic cross-sectional spinal cord area (CS-SCA) in multiple sclerosis (MS) correlates with disability, whilst such a correlation remains to be established in neuromyelitis optica spectrum disorder (NMOSD). Our aim was to clarify differences between MS and NMOSD in spinal cord segments where CS-SCA is associated with disability. METHODS The CS-SCA at C2/C3, C3/C4, T8/T9 and T9/T10 vertebral disc levels was measured in 140 MS patients (111 with relapsing-remitting MS and 29 with progressive MS) and 42 NMOSD patients with anti-aquaporin-4 immunoglobulin G. Disability was evaluated by Expanded Disability Status Scale (EDSS) scores. Multivariate associations between CS-SCA and disability were assessed by stepwise forward multiple linear regression. RESULTS Thoracic CS-SCA was significantly smaller in NMOSD patients than in MS patients even after adjusting for age, sex and disease duration (P = 0.002 at T8/T9), whilst there was no difference in cervical CS-SCA between the two diseases. Cervical and thoracic CS-SCA had a negative correlation with EDSS scores in MS patients (P < 0.0001 at C3/C4 and P = 0.0002 at T8/T9) whereas only thoracic CS-SCA correlated with EDSS scores in NMOSD patients (P = 0.0006 at T8/T9). By multiple regression analyses, predictive factors for disability in MS were smaller cervical CS-SCA, progressive course, older age and a higher number of relapses, whilst those in NMOSD were smaller thoracic CS-SCA and older age. CONCLUSIONS Thoracic CS-SCA is a useful predictive marker for disability in patients with NMOSD whilst cervical CS-SCA is associated with disability in patients with MS.
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Affiliation(s)
- Y Nakamura
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Z Liu
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - S Fukumoto
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - K Shinoda
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - A Sakoda
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T Matsushita
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - S Hayashida
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - N Isobe
- Department of Neurological Therapeutics, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - M Watanabe
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - A Hiwatashi
- Department of Molecular Imaging & Diagnosis, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - R Yamasaki
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - J-I Kira
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Song S, Gong T, Yamasaki R, Kim J, Wood TK. Identification of a potent indigoid persister antimicrobial by screening dormant cells. Biotechnol Bioeng 2019; 116:2263-2274. [DOI: 10.1002/bit.27078] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 05/19/2019] [Accepted: 05/27/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Sooyeon Song
- Department of Chemical EngineeringPennsylvania State UniversityUniversity Park Pennsylvania
| | - Ting Gong
- Department of Chemical EngineeringPennsylvania State UniversityUniversity Park Pennsylvania
| | - Ryota Yamasaki
- Department of Chemical EngineeringPennsylvania State UniversityUniversity Park Pennsylvania
| | - Jun‐Seob Kim
- Infectious Disease Research CenterKorea Research Institute of Bioscience and BiotechnologyDaejeon South Korea
| | - Thomas K. Wood
- Department of Chemical EngineeringPennsylvania State UniversityUniversity Park Pennsylvania
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22
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Zhu L, Gong T, Wood TL, Yamasaki R, Wood TK. σ 54 -Dependent regulator DVU2956 switches Desulfovibrio vulgaris from biofilm formation to planktonic growth and regulates hydrogen sulfide production. Environ Microbiol 2019; 21:3564-3576. [PMID: 31087603 DOI: 10.1111/1462-2920.14679] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Accepted: 05/11/2019] [Indexed: 11/30/2022]
Abstract
Microbiologically influenced corrosion causes $100 billion in damage per year, and biofilms formed by sulfate-reducing bacteria (SRB) are the major culprit. However, little is known about the regulation of SRB biofilm formation. Using Desulfovibrio vulgaris as a model SRB organism, we compared the transcriptomes of biofilm and planktonic cells and identified that the gene for σ54 -dependent regulator DVU2956 is repressed in biofilms. Utilizing a novel promoter that is primarily transcribed in biofilms (Pdvu0304 ), we found production of DVU2956 inhibits biofilm formation by 70%. Corroborating this result, deleting dvu2956 increased biofilm formation, and this biofilm phenotype could be complemented. By producing proteins in biofilms from genes controlled by DVU2956 (dvu2960 and dvu2962), biofilm formation was inhibited almost completely. A second round of RNA-seq for the production of DVU2956 revealed DVU2956 influences electron transport via an Hmc complex (high-molecular-weight cytochrome c encoded by dvu0531-dvu0536) and the Fe-only hydrogenase (encoded by dvu1769, hydA and dvu1770, hydB) to control H2 S production. Corroborating these results, producing DVU2956 in biofilms decreased H2 S production by half, deleting dvu2956 increased H2 S production by 131 ± 5%, and producing DVU2956 in the dvu2956 strain reduced H2 S production. Therefore, DVU2956 maintains SRB in the planktonic state and reduces H2 S formation.
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Affiliation(s)
- Lei Zhu
- Department of Chemical Engineering, Pennsylvania State University, University Park, State College, PA, 16802, USA
| | - Ting Gong
- Department of Chemical Engineering, Pennsylvania State University, University Park, State College, PA, 16802, USA
| | - Thammajun L Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, State College, PA, 16802, USA
| | - Ryota Yamasaki
- Department of Chemical Engineering, Pennsylvania State University, University Park, State College, PA, 16802, USA
| | - Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, State College, PA, 16802, USA
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23
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Wood TK, Song S, Yamasaki R. Ribosome dependence of persister cell formation and resuscitation. J Microbiol 2019; 57:213-219. [PMID: 30806978 DOI: 10.1007/s12275-019-8629-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 12/13/2018] [Accepted: 12/26/2018] [Indexed: 01/05/2023]
Abstract
Since most bacterial cells are starving, they must enter a resting stage. Persister is the term used for metabolically-dormant cells that are not spores, and these cells arise from stress such as that from antibiotics as well as that from starvation. Because of their lack of metabolism, persister cells survive exposure to multiple stresses without undergoing genetic change; i.e., they have no inherited phenotype and behave as wild-type cells once the stress is removed and nutrients are presented. In contrast, mutations allow resistant bacteria to grow in the presence of antibiotics and slow growth allows tolerant cells to withstand higher concentrations of antibiotics; hence, there are three closely-related phenotypes: persistent, resistant, and tolerant. In addition, since dormancy is so prevalent, persister cells must have a means for resuscitating (since so many cells should obtain this resting state). In this review, we focus on what is known about the formation and resuscitation of persister cells.
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Affiliation(s)
- Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802-4400, USA.
| | - Sooyeon Song
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802-4400, USA
| | - Ryota Yamasaki
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802-4400, USA
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24
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Takatsuji Y, Nakata I, Morimoto M, Sakakura T, Yamasaki R, Haruyama T. Highly Selective Methane Production Through Electrochemical CO2 reduction by Electrolytically Plated Cu-Co Electrode. Electrocatalysis (N Y) 2018. [DOI: 10.1007/s12678-018-0492-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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25
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Yamasaki R, Maeda T, Wood TK. Electron carriers increase electricity production in methane microbial fuel cells that reverse methanogenesis. Biotechnol Biofuels 2018; 11:211. [PMID: 30061933 PMCID: PMC6058355 DOI: 10.1186/s13068-018-1208-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/16/2018] [Indexed: 05/24/2023]
Abstract
BACKGROUND We previously reversed methanogenesis in microbial fuel cells (MFCs) to produce electricity for the first time from methane by combining an engineered archaeal strain that produces methyl-coenzyme M reductase from unculturable anaerobic methanotrophs (to capture methane and secrete acetate) with Geobacter sulfurreducens (to produce electrons from the generated acetate) and methane-acclimated sludge (to provide electron shuttles). RESULTS Here, the power density in MFCs was increased 77-fold to 5216 mW/m2 and the current density in MFCs was increased 73-fold to 7.3 A/m2 by reducing the surface area of the cathode (to make reasonable comparisons to other MFCs), by changing the order the strains of the consortium were added to the anode compartment, and by adding additional electron carriers (e.g., humic acids and cytochrome C). CONCLUSIONS This power density and current density are comparable to the best for any MFC, including those with Shewanella and Geobacter spp. that utilize non-gaseous substrates. In addition, we demonstrate the methane MFC may be used to power a fan by storing the energy in a capacitor. Hence, MFCs that convert methane to electricity are limited by electron carriers.
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Affiliation(s)
- Ryota Yamasaki
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400 USA
| | - Toshinari Maeda
- Department of Biological Functions Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, 808-0196 Japan
| | - Thomas K. Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400 USA
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26
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Kim JS, Chowdhury N, Yamasaki R, Wood TK. Viable but non-culturable and persistence describe the same bacterial stress state. Environ Microbiol 2018; 20:2038-2048. [PMID: 29457686 DOI: 10.1111/1462-2920.14075] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 02/01/2018] [Accepted: 02/13/2018] [Indexed: 11/30/2022]
Abstract
Bacteria are often thought of as having two dormant phenotypes: the viable but non-culturable (VBNC) state and the persister state. Here we investigate the relatedness of the two stress-induced phenotypes at the single-cell level and examine cell morphology and quantify cell resuscitation. Using the classic starvation conditions to create VBNC cells, we found that the majority of the remaining Escherichia coli population are spherical, have empty cytosol and fail to resuscitate; however, some of the spherical cells resuscitate immediately (most probably those with dense cytosol). Critically, all the culturable cells in this starved population became persister cells within 14 days of starvation. We found that the persister cells initially are rod-like, have clear but limited membrane damage, can resuscitate immediately and gradually become spherical by aging. After 24 h, only rod-shaped persister cells survive, and all the spherical cells lyse. Both cell populations formed under the VBNC-inducing conditions and the persister conditions are metabolically inactive. Therefore, the bacterial population consists of dead cells and persister cells in the VBNC-inducing conditions; that is, the non-lysed particles that do not resuscitate are dead, and the dormant cells that resuscitate are persister cells. Hence, 'VBNC' and 'persister' describe the same dormant phenotype.
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Affiliation(s)
- Jun-Seob Kim
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, 16802-4400, USA.,Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Nityananda Chowdhury
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, 16802-4400, USA.,Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Ryota Yamasaki
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, 16802-4400, USA.,Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Thomas K Wood
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, 16802-4400, USA.,Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
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27
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Abstract
Since persister cells survive antibiotic treatments through dormancy and resuscitate to reconstitute infections, it is imperative to determine the rate at which these cells revive. Using two sets of Escherichia coli persister cells, those arising after antibiotic treatment at low levels and those generated at high levels by ceasing transcription via rifampicin pretreatment (shown to be bona fide persisters through eight sets of experiments), we used microscopy of single cells to determine that the resuscitation of dormant persisters is heterogeneous and includes cells that grow immediately. In all, five phenotypes were found during the observation of persister cells when fresh nutrients were added: (i) immediate division, (ii) immediate elongation followed by division, (iii) immediate elongation but no division, (iv) delayed elongation/division and (v) no growth. In addition, once cell division begins, the growth rate is that of exponential cells. Critically, the greater the ribosome content, the faster the persister cells resuscitate.
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Affiliation(s)
- Jun-Seob Kim
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Ryota Yamasaki
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Sooyeon Song
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Weiwei Zhang
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
| | - Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16802-4400, USA
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28
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Guzailiayi M, Shinoda K, Nakamura Y, Masaki K, Matsushita T, Yamasaki R, Yoshikai Y, Kira J. Derangement of gamma deltaγδ t cell subsets is associated with disease severity of multiple sclerosis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Shinoda K, Matsushita T, Nakamura Y, Masaki K, Yamasaki R, Togao O, Hiwatashi A, Kira J. HLA–DRB1*04:05 is associated with intracortical lesions on 3-dimensional double inversion recovery imaging in Japanese patients with multiple sclerosis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Matsushita T, Nakamura Y, Niino M, Fukaura H, Tanaka M, Ochi H, Kanda T, Yokota T, Matsui M, Kusunoki S, Terayama Y, Kawachi I, Ohashi T, Shimohama S, Nishiyama K, Nakatsuji Y, Suzumura A, Ochi K, Yamamoto K, Yamasaki R, Kawano Y, Tsuji S, Hinomura A, Tada M, Matsuyama A, Shimizu Y, Nagaishi A, Okada K, Shinoda K, Isobe N, Kira J. Clinical and genetic features of Japanese patients with multiple sclerosis and neuromyelitis optica spectrum disorder based on Japan multiple sclerosis biobank. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2219] [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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31
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Tanaka K, Matsumoto S, Murai H, Yamasaki R, Kira J. Measurement conditions of end-diastolic ratio of common carotid arteries alter diagnostic ability for large artery intracranial occlusive disease. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2690] [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: 11/15/2022]
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32
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Kaida K, Kadoya M, Koike H, Iijima M, Takazaki H, Ogata H, Moriguchi K, Shimizu J, Nagata E, Takizawa S, Chiba A, Yamasaki R, Kira J, Sobue G, Ikewaki K. Diagnostic utility of ELISA for anti-neurofascin 155 antibodies in chronic inflammatory demyelinating polyradiculoneuropathy. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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33
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Koike H, Kadoya M, Kaida K, Nishi R, Ikeda S, Kawagashira Y, Iijima M, Kato D, Ogata H, Yamasaki R, Matsukawa N, Kira J, Katsuno M, Sobue G. Paranodal axo-glial detachment in chronic inflammatory demyelinating polyneuropathy with anti-neurofascin-155 and anti-contactin-1 antibodies. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Mezaki N, Miura T, Ogaki K, Eriguchi M, Mizuno Y, Komatsu K, Yamazaki H, Ono N, Kawajiri S, Yamasaki R, Nozaki H, Kasuga K, Okuma Y, Kira J, Hara H, Onodera O, Ikeuchi T. LMNB1-related adult-onset autosomal dominant leukodystrophy: Genetic and clinical studies of four Japanese families. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Saitoh B, Yamasaki R, Van Kruining D, Kira J. Early postnatal allergen exposure induces autism-like behavior in male mice. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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36
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Ogata H, Yamasaki R, Matsushita T, Kadoya M, Kaida K, Matsui M, Kuwabara S, Kusunoki S, Kira J. Proposal of diagnostic criteria for anti-neurofascin 155 antibody-associated neuropathy. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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37
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Une H, Yamaguchi H, Zhao Y, Shinoda K, Masaki K, Götz M, Yamasaki R, Kira J. Experimental autoimmune encephalomyelitis is ameliorated in mice with gray matter astroglia-specific inducible connexin 43 knock-out. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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38
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Yamashita K, Uehara T, Pukovisa P, Taniwaki Y, Utsunomiya H, Yamasaki R, Kira J. Functional connectivity changes related to cognitive improvement by acetylcholine esterase inhibitors in Alzheimer disease. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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39
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Hayashi S, Yamasaki R, Okamoto K, Murai H, Kira J. Distinct distribution of activated microglia/macrophages and dendritic cells in the spinal white matter of amyotrophic lateral sclerosis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Yamasaki R, Takatsuji Y, Morimoto M, Ishikawa S, Fujinami T, Haruyama T. Sustainable process for functional group introduction onto HOPG by exposing OH and 1O2 using a radical vapor reactor (RVR) without any chemical reagents. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Kumagai S, Yamasaki R, Kameda T, Saito Y, Watanabe A, Watanabe C, Teramae N, Yoshioka T. Tandem μ-reactor-GC/MS for online monitoring of aromatic hydrocarbon production via CaO-catalysed PET pyrolysis. REACT CHEM ENG 2017. [DOI: 10.1039/c7re00097a] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Online monitoring of products by a tandem μ-reactor-GC/MS system revealed the CaO catalysed PET pyrolysis pathway.
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Affiliation(s)
- S. Kumagai
- Graduate School of Environmental Studies
- Tohoku University
- Sendai
- Japan
| | - R. Yamasaki
- Graduate School of Environmental Studies
- Tohoku University
- Sendai
- Japan
| | - T. Kameda
- Graduate School of Environmental Studies
- Tohoku University
- Sendai
- Japan
| | - Y. Saito
- Graduate School of Environmental Studies
- Tohoku University
- Sendai
- Japan
| | | | | | - N. Teramae
- Frontier Laboratories Ltd
- Koriyama
- Japan
- Department of Chemistry
- Graduate School of Science
| | - T. Yoshioka
- Graduate School of Environmental Studies
- Tohoku University
- Sendai
- Japan
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42
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Shinoda K, Iwata T, Nakamura Y, Masaki K, Matsushita T, Yamasaki R, Kira JI. Minocycline-induced human herpesvirus 6 encephalomyelitis with drastically disseminated contrast-enhanced lesions. Eur J Neurol 2016; 23:e76-e77. [PMID: 27882729 DOI: 10.1111/ene.13190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 09/16/2016] [Indexed: 11/27/2022]
Affiliation(s)
- K Shinoda
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T Iwata
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Y Nakamura
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - K Masaki
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T Matsushita
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - R Yamasaki
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - J-I Kira
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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43
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Affiliation(s)
- Ryota Yamasaki
- Advanced
Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan
| | - Tetsuya Haruyama
- Advanced
Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan
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44
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Yamasaki R, Takatsuji Y, Asakawa H, Fukuma T, Haruyama T. Flattened-Top Domical Water Drops Formed through Self-Organization of Hydrophobin Membranes: A Structural and Mechanistic Study Using Atomic Force Microscopy. ACS Nano 2016; 10:81-87. [PMID: 26595357 DOI: 10.1021/acsnano.5b04049] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The Trichoderma reesei hydrophobin, HFBI, is a unique structural protein. This protein forms membranes by self-organization at air/water or water/solid interfaces. When HFBI forms a membrane at an air/water interface, the top of the water droplet is flattened. The mechanism underlying this phenomenon has not been explored. In this study, this unique phenomenon has been investigated. Self-organized HFBI membranes form a hexagonal structured membrane on the surface of water droplets; the structure was confirmed by atomic force microscopy (AFM) measurement. Assembled hexagons can form a planar sheet or a tube. Self-organized HFBI membranes on water droplets form a sheet with an array of hexagonal structures or a honeycomb structure. This membrane, with its arrayed hexagonal structures, has very high buckling strength. We hypothesized that the high buckling strength is the reason that water droplets containing HFBI form flattened domes. To test this hypothesis, the strength of the self-organized HFBI membranes was analyzed using AFM. The buckling strength of HFBI membranes was measured to be 66.9 mN/m. In contrast, the surface tension of water droplets containing dissolved HFBI is 42 mN/m. Thus, the buckling strength of a self-organized HFBI membrane is higher than the surface tension of water containing dissolved HFBI. This mechanistic study clarifies why the water droplets formed by self-organized HFBI membranes have a flattened top.
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Affiliation(s)
- Ryota Yamasaki
- Advanced Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST) , Tokyo 102-0076, Japan
| | - Yoshiyuki Takatsuji
- Advanced Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST) , Tokyo 102-0076, Japan
| | - Hitoshi Asakawa
- Advanced Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST) , Tokyo 102-0076, Japan
| | - Takeshi Fukuma
- Advanced Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST) , Tokyo 102-0076, Japan
| | - Tetsuya Haruyama
- Advanced Catalytic Transformation Program for Carbon Utilization (ACT-C), Japan Science and Technology Agency (JST) , Tokyo 102-0076, Japan
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45
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Kikuchi M, Akahoshi Y, Nakano H, Ugai T, Wada H, Yamasaki R, Sakamoto K, Kawamura K, Ishihara Y, Sato M, Ashizawa M, Terasako-Saito K, Kimura S, Yamazaki R, Kanda J, Kako S, Nishida J, Kanda Y. Risk factors for pre- and post-engraftment bloodstream infections after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2015; 17:56-65. [PMID: 25580541 DOI: 10.1111/tid.12345] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/29/2014] [Accepted: 11/03/2014] [Indexed: 11/26/2022]
Abstract
BACKGROUND Bloodstream infections (BSI) are frequently observed after allogeneic hematopoietic stem cell transplant (HSCT), and could cause morbidity and mortality. METHODS We retrospectively evaluated the incidence, characteristics of, and risk factors for BSI at both pre- and post-engraftment in 209 adult HSCT patients at our institute between June 2006 and December 2013. The median age at transplantation was 45 years (range, 15-65). A total of 122 patients received bone marrow, 68 received peripheral blood stem cells, and 19 received umbilical cord blood. RESULTS The cumulative incidences of pre- and post-engraftment BSI were 38.9% and 17.2%, respectively. Nine patients had both pre- and post-engraftment BSI. In the pre- and post-engraftment periods, respectively, 67.4% and 84.1% of isolates were gram-positive bacteria (GPB), 28.3% and 11.4% were gram-negative bacteria (GNB), and 4.3% and 4.5% were fungi. Coagulase-negative staphylococci were the most commonly isolated GPB, while Stenotrophomonas maltophilia and Pseudomonas aeruginosa were the most commonly isolated GNB. Pre-engraftment BSI was associated with an increased risk of death. Overall survival at day 180 for patients with or without pre-engraftment BSI was 70.0% and 82.7%, respectively (P = 0.02). CONCLUSIONS Risk factors for BSI in the pre-engraftment period were the interval between diagnosis and transplantation (261 days or more), engraftment failure, and high-risk disease status at HSCT in a multivariate analysis. No significant risk factor for BSI in the post-engraftment period was identified by a univariate analysis. These findings may be useful for deciding upon empiric antibacterial treatment for HSCT recipients.
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Affiliation(s)
- M Kikuchi
- Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan
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46
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Kimura SI, Murata T, Akahoshi Y, Nakano H, Ugai T, Wada H, Yamasaki R, Ishihara Y, Kawamura K, Sakamoto K, Ashizawa M, Sato M, Terasako-Saito K, Nakasone H, Kikuchi M, Yamazaki R, Kako S, Kanda J, Tanihara A, Nishida J, Kanda Y. Economic evaluation of a preemptive treatment strategy for invasive fungal infection in neutropenic patients with hematological diseases. Eur J Clin Microbiol Infect Dis 2015; 34:951-61. [PMID: 25577175 DOI: 10.1007/s10096-014-2311-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 12/29/2014] [Indexed: 02/03/2023]
Abstract
We compared the expected medical costs of empirical and preemptive treatment strategies for invasive fungal infection in neutropenic patients with hematological diseases. Based on the results of two clinical trials with different backgrounds reported by Oshima et al. [J Antimicrob Chemother 60(2):350-355; Oshima study] and Cordonnier et al. [Clin Infect Dis 48(8):1042-1051; PREVERT study], we developed a decision tree model that represented the outcomes of empirical and preemptive treatment strategies, and estimated the expected medical costs of medications and examinations in the two strategies. We assumed that micafungin was started in the empirical group at 5 days after fever had developed, while voriconazole was started in the preemptive group only when certain criteria, such as positive test results of imaging studies and/or serum markers, were fulfilled. When we used an incidence of positive test results of 6.7 % based on the Oshima study, the expected medical costs of the empirical and preemptive groups were 288,198 and 150,280 yen, respectively. Even in the case of the PREVERT study, in which the incidence of positive test results was 32.9 %, the expected medical costs in the empirical and preemptive groups were 291,871 and 284,944 yen, respectively. A sensitivity analysis indicated that the expected medical costs in the preemptive group would exceed those in the empirical group when the incidence of positive test results in the former was over 34.4 %. These results suggest that a preemptive treatment strategy can be expected to reduce medical costs compared with empirical therapy in most clinical settings.
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Affiliation(s)
- S-I Kimura
- Division of Hematology, Saitama Medical Center, Jichi Medical University, 1-847 Amanuma, Omiya-ku, Saitama-city, Saitama, 330-8503, Japan
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47
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Terasako-Saito K, Nakasone H, Tanaka Y, Yamazaki R, Sato M, Sakamoto K, Ishihara Y, Kawamura K, Akahoshi Y, Hayakawa J, Wada H, Harada N, Nakano H, Kameda K, Ugai T, Yamasaki R, Ashizawa M, Kimura SI, Kikuchi M, Tanihara A, Kanda J, Kako S, Nishida J, Kanda Y. Persistence of recipient-derived as well as donor-derived clones of cytomegalovirus pp65-specific cytotoxic T cells long after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2014; 16:930-40. [DOI: 10.1111/tid.12318] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 09/14/2014] [Indexed: 11/27/2022]
Affiliation(s)
- K. Terasako-Saito
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakasone
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Tanaka
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - R. Yamazaki
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Sato
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Sakamoto
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Ishihara
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Kawamura
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Akahoshi
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Hayakawa
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Wada
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - N. Harada
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakano
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Kameda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - T. Ugai
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - R. Yamasaki
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Ashizawa
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S.-I. Kimura
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Kikuchi
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - A. Tanihara
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Kanda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S. Kako
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Nishida
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Kanda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
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48
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Yamazaki R, Tanaka Y, Nakasone H, Sato M, Terasako-Saito K, Sakamoto K, Akahoshi Y, Nakano H, Ugai T, Yamasaki R, Wada H, Ishihara Y, Kawamura K, Ashizawa M, Kimura SI, Kikuchi M, Kako S, Kanda J, Tanihara A, Nishida J, Kanda Y. Allotype analysis to determine the origin of cytomegalovirus immunoglobulin-G after allogeneic stem cell transplantation. Transpl Infect Dis 2014; 16:904-13. [DOI: 10.1111/tid.12304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 07/17/2014] [Accepted: 08/07/2014] [Indexed: 11/26/2022]
Affiliation(s)
- R. Yamazaki
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Tanaka
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakasone
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Sato
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Terasako-Saito
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Sakamoto
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Akahoshi
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakano
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - T. Ugai
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - R. Yamasaki
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Wada
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Ishihara
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Kawamura
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Ashizawa
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S.-I. Kimura
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Kikuchi
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S. Kako
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Kanda
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - A. Tanihara
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Nishida
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Kanda
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
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49
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Nakasone H, Tanaka Y, Yamazaki R, Terasako K, Sato M, Sakamoto K, Yamasaki R, Wada H, Ishihara Y, Kawamura K, Machishima T, Ashizawa M, Kimura SI, Kikuchi M, Tanihara A, Kanda J, Kako S, Nishida J, Kanda Y. Single-cell T-cell receptor-β analysis of HLA-A*2402-restricted CMV- pp65-specific cytotoxic T-cells in allogeneic hematopoietic SCT. Bone Marrow Transplant 2013; 49:87-94. [DOI: 10.1038/bmt.2013.122] [Citation(s) in RCA: 13] [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: 03/06/2013] [Revised: 04/19/2013] [Accepted: 05/23/2013] [Indexed: 11/09/2022]
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50
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Takatsuji Y, Yamasaki R, Iwanaga A, Lienemann M, Linder MB, Haruyama T. Solid-support immobilization of a "swing" fusion protein for enhanced glucose oxidase catalytic activity. Colloids Surf B Biointerfaces 2013; 112:186-91. [PMID: 23974004 DOI: 10.1016/j.colsurfb.2013.07.051] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 07/10/2013] [Accepted: 07/26/2013] [Indexed: 02/04/2023]
Abstract
The strategic surface immobilization of a protein can add new functionality to a solid substrate; however, protein activity, e.g., enzymatic activity, can be drastically decreased on immobilization onto a solid surface. The concept of a designed and optimized "molecular interface" is herein introduced in order to address this problem. In this study, molecular interface was designed and constructed with the aim of attaining high enzymatic activity of a solid-surface-immobilized a using the hydrophobin HFBI protein in conjunction with a fusion protein of HFBI attached to glucose oxidase (GOx). The ability of HFBI to form a self-organized membrane on a solid surface in addition to its adhesion properties makes it an ideal candidate for immobilization. The developed fusion protein was also able to form an organized membrane, and its structure and immobilized state on a solid surface were investigated using QCM-D measurements. This method of immobilization showed retention of high enzymatic activity and the ability to control the density of the immobilized enzyme. In this study, we demonstrated the importance of the design and construction of molecular interface for numerous purposes. This method of protein immobilization could be utilized for preparation of high throughput products requiring structurally ordered molecular interfaces, in addition to many other applications.
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Affiliation(s)
- Yoshiyuki Takatsuji
- Department of Biological Functions and Engineering, Kyushu Institute of Technology, Kitakyushu Science and Research Park, Kitakyushu, Fukuoka, 808-0196, Japan; JST ACT-C, Japan
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