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Wakabayashi Y, Kumeda Y, Yoshihara S, Tokumoto H, Kawatsu K, Miyake M. Prevalence of Staphylococcus argenteus among food handlers, kitchen utensils, and food samples in Japan. Lett Appl Microbiol 2024; 77:ovae031. [PMID: 38544318 DOI: 10.1093/lambio/ovae031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 03/01/2024] [Accepted: 03/26/2024] [Indexed: 04/17/2024]
Abstract
Staphylococcus argenteus has received increased attention from an aspect of food safety since several food poisoning outbreaks caused by the bacterium were reported in Japan. However, S. argenteus prevalence among food handlers and utensils has not yet been investigated. In this study, we investigated S. argenteus prevalence among a collection of coagulase-positive staphylococci (CPS) that were isolated during food sanitary inspections in Japan. Out of a total of 191 CPS isolates, 14 were identified as S. argenteus. One was isolated from shelled shrimp, nine were isolated from food handlers' hand swabs, and four were isolated from kitchen utensils. Whole-genome sequencing revealed that transmission of S. argenteus from human hands to utensils was possible. Though all 14 isolates were negative for the pvl and tst-1 genes, 6 harbored the seb gene. Only 21.4% of S. argenteus isolates were resistant to antibiotics, while 62.1% of the S. aureus isolates from the same sources were confirmed to be resistant. To the best of our knowledge, this is the first report to demonstrate possible transmission of S. argenteus from food handlers to utensils in food-processing environments.
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Affiliation(s)
- Yuki Wakabayashi
- Bacteriology Section, Division of Microbiology, Osaka Institute of Public Health, 1-3-3 Nakamichi, Higashinari-ku, Osaka, 537-0025, Japan
- Graduate School of Veterinary Science, Department of Veterinary Science, Osaka Metropolitan University, 1-58 Rinku Ourai Kita, Izumisano, Osaka, 598-0048, Japan
| | - Yuko Kumeda
- Research Center of Microorganism Control, Organization for Research Promotion, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-kyu, Sakai, Osaka, 599-8231, Japan
| | - Shizue Yoshihara
- Graduate School of Science, Department of Biology, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8231, Japan
| | - Hayato Tokumoto
- Graduate School of Science, Department of Biology, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8231, Japan
| | - Kentaro Kawatsu
- Bacteriology Section, Division of Microbiology, Osaka Institute of Public Health, 1-3-3 Nakamichi, Higashinari-ku, Osaka, 537-0025, Japan
| | - Masami Miyake
- Graduate School of Veterinary Science, Department of Veterinary Science, Osaka Metropolitan University, 1-58 Rinku Ourai Kita, Izumisano, Osaka, 598-0048, Japan
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Yamada R, Ando Y, Mitsui R, Mizobata A, Yoshihara S, Tokumoto H, Matsumoto T, Ogino H. Improving carotenoid production in recombinant yeast, Saccharomyces cerevisiae, using ultrasound-irradiated two-phase extractive fermentation. Eng Life Sci 2022; 22:4-12. [PMID: 35024023 PMCID: PMC8727735 DOI: 10.1002/elsc.202100051] [Citation(s) in RCA: 4] [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: 04/30/2021] [Revised: 08/11/2021] [Accepted: 10/10/2021] [Indexed: 12/28/2022] Open
Abstract
Carotenoids are hydrophobic compounds that exhibit excellent bioactivity and can be produced by recombinant S. cerevisiae. Irradiating microorganisms with ultrasonic waves increase the productivity of various useful chemicals. Ultrasonic waves are also used to extract useful chemicals that accumulate in microbial cells. In this study, we aimed to improve the carotenoid production efficiency of a recombinant S. cerevisiae using an ultrasonic-irradiation based two-phase extractive fermentation process. When isopropyl myristate was used as the extraction solvent, a total of 264 mg/L of carotenoid was produced when batches were subjected to ultrasonic-irradiation at 10 W, which was a 1.3-fold increase when compared to the control. Transcriptome analysis suggested that one of the reasons for this improvement was an increase in the number of living cells. In fact, after 96 h of fermentation, the number of living cells increased by 1.4-fold upon irradiation with ultrasonic waves. Consequently, we succeeded in improving the carotenoid production in a recombinant S. cerevisiae strain using a ultrasonic-irradiated two-phase extractive fermentation and isopropyl myristate as the solvent. This fermentation strategy has the potential to be widely applied during the production of hydrophobic chemicals in recombinant yeast, and future research is expected to further develop this process.
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Affiliation(s)
- Ryosuke Yamada
- Department of Chemical EngineeringOsaka Prefecture UniversitySakaiOsakaJapan
| | - Yorichika Ando
- Department of Chemical EngineeringOsaka Prefecture UniversitySakaiOsakaJapan
| | - Ryosuke Mitsui
- Department of Chemical EngineeringOsaka Prefecture UniversitySakaiOsakaJapan
| | - Asuka Mizobata
- Department of Chemical EngineeringOsaka Prefecture UniversitySakaiOsakaJapan
| | - Shizue Yoshihara
- Department of Biological ScienceOsaka Prefecture UniversitySakaiOsakaJapan
| | - Hayato Tokumoto
- Department of Biological ScienceOsaka Prefecture UniversitySakaiOsakaJapan
| | - Takuya Matsumoto
- Department of Chemical EngineeringOsaka Prefecture UniversitySakaiOsakaJapan
| | - Hiroyasu Ogino
- Department of Chemical EngineeringOsaka Prefecture UniversitySakaiOsakaJapan
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3
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Wakabayashi Y, Takemoto K, Iwasaki S, Yajima T, Kido A, Yamauchi A, Kuroiwa K, Kumai Y, Yoshihara S, Tokumoto H, Kawatsu K, Yasugi M, Miyake M. Isolation and characterization of Staphylococcus argenteus strains from retail foods and slaughterhouses in Japan. Int J Food Microbiol 2021; 363:109503. [PMID: 34968888 DOI: 10.1016/j.ijfoodmicro.2021.109503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 08/28/2021] [Revised: 12/05/2021] [Accepted: 12/11/2021] [Indexed: 11/20/2022]
Abstract
Staphylococcus argenteus has been recently established as a novel species of Staphylococcus aureus complex. It is known to cause various human diseases, such as skin and soft-tissue infections, sepsis, and staphylococcal food poisoning, although the source of infection has not been clearly described. In food poisoning cases, the source of bacterial contamination in food is unknown. This study examined the prevalence of S. argenteus among retail fresh food and poultry slaughterhouses in Japan. Among 642 food samples examined, successful isolation of S. argenteus was achieved in 21 of 151 (13.9%) chicken samples. No isolations from pork, beef, fish, or vegetables in retail markets were confirmed. Multiple-locus sequence typing revealed that the 21 isolates were classified into four sequence types (ST) that were divided into 14 subtypes using spa-typing. All food isolates were susceptible to methicillin and did not show positivity for the Panton-Valentine leukocidin gene. When bacteria were isolated from two poultry slaughterhouses in the same region, 14 S. argenteus strains were successfully isolated from only one slaughterhouse. Thirteen of 14 strains were isolated from a poultry carcass and slaughterhouse environments during a certain sampling period and were all classified as ST5961 with identical spa-type. Also, the number of single nucleotide variants (SNVs) detected on the core genomes of the same 13 strains were between 0 and 17, suggesting a long-term inhabitation of an S. argenteus strain inside the facility. Furthermore, one isolate from chicken meat was also genetically linked with the same lineage of slaughterhouse isolates, with ≤15 SNVs being detected. Additionally, one slaughterhouse isolate from chiller water and three chicken isolates were classified into the same cluster by phylogenetic analysis, although the number of pairwise SNVs ranged from 62 to 128. To the best of the authors' knowledge, this is the first study that demonstrated S. argenteus in a food processing facility and the possible bacterial contamination on food during food processing.
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Affiliation(s)
- Yuki Wakabayashi
- Bacteriology Section, Division of Microbiology, Osaka Institute of Public Health, 1-3-69 Nakamichi, Higashinari-ku, Osaka, Japan; Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku Ourai Kita, Izumisano, Osaka, Japan
| | - Kohei Takemoto
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Satomi Iwasaki
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Tomoya Yajima
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Akiko Kido
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Akiko Yamauchi
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Kyoko Kuroiwa
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Yuko Kumai
- Osaka Prefectural Government Poultry Inspection Center, 2-11-13 Sangenyahigashi, Taisyo-ku, Osaka, Japan
| | - Shizue Yoshihara
- Department of Biological Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, Japan
| | - Hayato Tokumoto
- Department of Biological Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, Japan
| | - Kentaro Kawatsu
- Bacteriology Section, Division of Microbiology, Osaka Institute of Public Health, 1-3-69 Nakamichi, Higashinari-ku, Osaka, Japan
| | - Mayo Yasugi
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku Ourai Kita, Izumisano, Osaka, Japan
| | - Masami Miyake
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku Ourai Kita, Izumisano, Osaka, Japan.
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Hirose Y, Shiozaki T, Hamano I, Yoshihara S, Tokumoto H, Eki T, Harada N. A specific combination of dual index adaptors decreases the sensitivity of amplicon sequencing with the Illumina platform. DNA Res 2021; 27:5893952. [PMID: 32810209 PMCID: PMC7547650 DOI: 10.1093/dnares/dsaa017] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 08/11/2020] [Indexed: 11/14/2022] Open
Abstract
Amplicon sequencing is a powerful approach in microbiome studies as it detects live organisms with high sensitivity. This approach determines the composition of sequence variants of marker genes using high-throughput DNA sequencers. The use of dual index adaptors is the fundamental technique for pooling DNA libraries for Illumina sequencers and is believed not to affect the results. However, here, we observed a decrease of sequence quality in samples containing a specific combination of indexes, namely N704 and S507 in Nextera kits, in multiple runs on the Illumina MiSeq sequencer operated in different facilities. This decrease was also observed when sequencing randomly fragmented DNA of Escherichia coli and was not observed when either individual adaptor was used. Each end of the DNA library with this index combination contains a complementary sequence motif, which potentially inhibits proper cluster generation and/or subsequent sequencing. Community analysis of the 16S and 18S rRNA amplicons using QIIME2 revealed significant decreases in α-diversity in the samples containing the N704/S507 index combination, resulting from loss of low-abundance sequence variants during denoising. Our data underscore the importance of quality validation of sequence reads in developing dual index techniques and suggest cautious interpretation of microbiome data containing low-quality sequence reads.
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Affiliation(s)
- Yuu Hirose
- Department of Applied Chemistry and Life Science, Toyohashi University of Technology, Tempaku, Toyohashi, Aichi 441-8580, Japan
| | - Takuhei Shiozaki
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan
| | - Itsuki Hamano
- Department of Biological Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Shizue Yoshihara
- Department of Biological Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Hayato Tokumoto
- Department of Biological Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Toshihiko Eki
- Department of Applied Chemistry and Life Science, Toyohashi University of Technology, Tempaku, Toyohashi, Aichi 441-8580, Japan
| | - Naomi Harada
- Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan
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Mizobata A, Mitsui R, Yamada R, Matsumoto T, Yoshihara S, Tokumoto H, Ogino H. Improvement of 2,3-butanediol tolerance in Saccharomyces cerevisiae by using a novel mutagenesis strategy. J Biosci Bioeng 2020; 131:283-289. [PMID: 33277188 DOI: 10.1016/j.jbiosc.2020.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 10/30/2020] [Accepted: 11/15/2020] [Indexed: 10/22/2022]
Abstract
Although the yeast Saccharomyces cerevisiae has been used to produce various bio-based chemicals, including solvents and organic acids, most of these products inhibit yeast growth at high concentrations. In general, it is difficult to rationally improve stress tolerance in yeast by modifying specific genes, because many of the genes involved in stress response remain unidentified. Previous studies have reported that various forms of stress tolerance in yeast were improved by introducing random mutations, such as DNA point mutations and DNA structural mutations. In this study, we developed a novel mutagenesis strategy that allows for the simultaneous performance of these two types of mutagenesis to construct a yeast variant with high 2,3-butanediol (2,3-BDO) tolerance. The mutations were simultaneously introduced into S. cerevisiae YPH499, accompanied by a stepwise increase in the concentration of 2,3-BDO. The resulting mutant YPH499/pol3δ/BD_392 showed 4.9-fold higher cell concentrations than the parental strain after 96 h cultivation in medium containing 175 g/L 2,3-BDO. Afterwards, we carried out transcriptome analysis to characterize the 2,3-BDO-tolerant strain. Gene ontology enrichment analysis with RNA sequence data revealed an increase in expression levels of genes related to amino acid metabolic processes. Therefore, we hypothesize that the yeast acquired high 2,3-BDO tolerance by amino acid function. Our research provides a novel mutagenesis strategy that achieves efficient modification of the genome for improving tolerance to various types of stressors.
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Affiliation(s)
- Asuka Mizobata
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Ryosuke Mitsui
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Ryosuke Yamada
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
| | - Takuya Matsumoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Shizue Yoshihara
- Department of Biological Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hayato Tokumoto
- Department of Biological Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hiroyasu Ogino
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
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6
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Harada N, Hanada K, Minami Y, Kitakaze T, Ogata Y, Tokumoto H, Sato T, Kato S, Inui H, Yamaji R. Role of gut microbiota in sex- and diet-dependent metabolic disorders that lead to early mortality of androgen receptor-deficient male mice. Am J Physiol Endocrinol Metab 2020; 318:E525-E537. [PMID: 32017595 DOI: 10.1152/ajpendo.00461.2019] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The gut microbiota is involved in metabolic disorders induced by androgen deficiency after sexual maturation in males (late-onset hypogonadism). However, its role in the energy metabolism of congenital androgen deficiency (e.g., androgen-insensitive syndrome) remains elusive. Here, we examined the link between the gut microbiota and metabolic disease symptoms in androgen receptor knockout (ARKO) mouse by administering high-fat diet (HFD) and/or antibiotics. HFD-fed male, but not standard diet-fed male or HFD-fed female, ARKO mice exhibited increased feed efficiency, obesity with increased visceral adipocyte mass and hypertrophy, hepatic steatosis, glucose intolerance, insulin resistance, and loss of thigh muscle. In contrast, subcutaneous fat mass accumulated in ARKO mice irrespective of the diet and sex. Notably, all HFD-dependent metabolic disorders observed in ARKO males were abolished after antibiotics administration. The ratios of fecal weight-to-food weight and cecum weight-to-body weight were specifically reduced by ARKO in HFD-fed males. 16S rRNA sequencing of fecal microbiota from HFD-fed male mice revealed differences in microbiota composition between control and ARKO mice. Several genera or species (e.g., Turicibacter and Lactobacillus reuteri, respectively) were enriched in ARKO mice, and antibiotics treatment spoiled the changes. Furthermore, the life span of HFD-fed ARKO males was shorter than that of control mice, indicating that androgen deficiency causes metabolic dysfunctions leading to early death. These findings also suggest that AR signaling plays a role in the prevention of metabolic dysfunctions, presumably by influencing the gut microbiome, and improve our understanding of health consequences in subjects with hypogonadism and androgen insensitivity.
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Affiliation(s)
- Naoki Harada
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Kazuki Hanada
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Yukari Minami
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Tomoya Kitakaze
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Yoshiyuki Ogata
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Hayato Tokumoto
- Division of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Takashi Sato
- Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, Japan
| | - Shigeaki Kato
- Graduate School of Science and Engineering, Iryo Sosei University, Iwaki, Fukushima, Japan
| | - Hiroshi Inui
- Department of Nutrition, College of Health and Human Sciences, Osaka Prefecture University, Habikino, Osaka, Japan
| | - Ryoichi Yamaji
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
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Nishiyama K, Aono K, Fujimoto Y, Kuwamura M, Okada T, Tokumoto H, Izawa T, Okano R, Nakajima H, Takeuchi T, Azuma YT. Chronic kidney disease after 5/6 nephrectomy disturbs the intestinal microbiota and alters intestinal motility. J Cell Physiol 2018; 234:6667-6678. [PMID: 30317589 DOI: 10.1002/jcp.27408] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 08/21/2018] [Indexed: 12/11/2022]
Abstract
Organ-organ crosstalk is involved in homeostasis. Gastrointestinal symptoms are common in patients with renal failure. The aim of this study was to elucidate the relationship between gastrointestinal motility and gastrointestinal symptoms in chronic kidney disease. We performed studies in C57BL/6 mice with chronic kidney disease after 5/6 nephrectomy. Gastrointestinal motility was evaluated by assessing the ex vivo responses of ileum and distal colon strips to electrical field stimulation. Feces were collected from mice, and the composition of the gut microbiota was analyzed using 16S ribosomal RNA sequencing. Mice with chronic kidney disease after 5/6 nephrectomy showed a decreased amount of stool, and this constipation was correlated with a suppressed contraction response in ileum motility and decreased relaxation response in distal colon motility. Spermine, one of the uremic toxins, inhibited the contraction response in ileum motility, but four types of uremic toxins showed no effect on the relaxation response in distal colon motility. The 5/6 nephrectomy procedure disturbed the balance of the gut microbiota in the mice. The motility dysregulation and constipation were resolved by antibiotic treatments. The expression levels of interleukin 6, tumor necrosis factor-α, and iNOS in 5/6 nephrectomy mice were increased in the distal colon but not in the ileum. In addition, macrophage infiltration in 5/6 nephrectomy mice was increased in the distal colon but not in the ileum. We found that 5/6 nephrectomy altered gastrointestinal motility and caused constipation by changing the gut microbiota and causing colonic inflammation. These findings indicate that renal failure was remarkably associated with gastrointestinal dysregulation.
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Affiliation(s)
- Kazuhiro Nishiyama
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Kimiya Aono
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Yasuyuki Fujimoto
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Mitsuru Kuwamura
- Laboratory of Veterinary Pathology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Toshiya Okada
- Department of Laboratory Animal Science, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Hayato Tokumoto
- Laboratory of Bioscience and Biotechnology, Division of Biological Science, Osaka Prefecture University Graduate School of Science, Osaka, Japan
| | - Takeshi Izawa
- Laboratory of Veterinary Pathology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Ryoichi Okano
- Laboratory of Separation Science and Engineering, Division of Chemical Engineering, Osaka Prefecture University Graduate School of Engineering, Osaka, Japan
| | - Hidemitsu Nakajima
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Tadayoshi Takeuchi
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
| | - Yasu-Taka Azuma
- Laboratory of Veterinary Pharmacology, Division of Veterinary Science, Osaka Prefecture University Graduate School of Life and Environmental Science, Osaka, Japan
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Hirayama Y, Hinoue M, Tokumoto H, Matsuoka A, Noishiki K, Muto A. Liquid–Liquid Extraction and Separation of Cobalt and Lithium Ions Using a Slug Flow Microreactor. Journal of Chemical Engineering of Japan 2018. [DOI: 10.1252/jcej.17we152] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuki Hirayama
- Graduate School of Engineering, Department of Chemical Engineering, Osaka Prefecture University
| | - Mikiya Hinoue
- Graduate School of Engineering, Department of Chemical Engineering, Osaka Prefecture University
| | - Hayato Tokumoto
- Graduate School of Engineering, Department of Chemical Engineering, Osaka Prefecture University
| | - Akira Matsuoka
- Technical Development Group, Mechanical Engineering Research Laboratory, Chemical & Environmental Technology Research Section, Kobe Steel, Ltd
| | - Koji Noishiki
- Machinery Business, Takasago Equipment Plant, Engineering Section, Kobe Steel, Ltd
| | - Akinori Muto
- Graduate School of Engineering, Department of Chemical Engineering, Osaka Prefecture University
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Kurahashi K, Kimura C, Fujimoto Y, Tokumoto H. Value-adding conversion and volume reduction of sewage sludge by anaerobic co-digestion with crude glycerol. Bioresour Technol 2017; 232:119-125. [PMID: 28214698 DOI: 10.1016/j.biortech.2017.02.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 01/31/2017] [Accepted: 02/03/2017] [Indexed: 06/06/2023]
Abstract
In this study, conversion of sewage sludge to biogas by anaerobic co-digestion with crude glycerol was examined. When 0.126g/L crude glycerol was added to the reactor, only methane was produced. Upon addition of 5.04g/L crude glycerol, hydrogen production occurred, and a significant amount of 1,3-propanediol (1,3-PDO) was generated in the liquid phase. On day 6, the dry weight was largely composed of organic acids (48%) and 1,3-PDO (17%), which are water-soluble. Degradation of 1,3-PDO was very slow, which is advantageous for recovery. Crude glycerol, which contains alkaline substances, promoted organic matter degradation by microorganisms, which possibly affected biogas and 1,3-PDO production. Addition of 0.630-2.52g/L glycerol initially led to hydrogen production, followed by methane production a few days later, which stabilized within 1week. In conclusion, adjustment of the crude glycerol concentration allows controllable conversion to value-added products for co-digestion.
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Affiliation(s)
- Kensuke Kurahashi
- Osaka Prefecture University College of Technology, 26-12 Saiwai-cho, Neyagawa, Osaka 572-8572, Japan
| | - Chie Kimura
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - You Fujimoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hayato Tokumoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Muto A, Hirayama Y, Tokumoto H, Matsuoka A, Noishiki K. Liquid–Liquid Extraction of Lithium Ions Using a Slug Flow Microreactor: Effect of Extraction Reagent and Microtube Material. Solvent Extraction and Ion Exchange 2017. [DOI: 10.1080/07366299.2016.1272388] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Akinori Muto
- Osaka Prefecture University, Department of Chemical Engineering, Graduate School of Engineering, Osaka, Japan
| | - Yuki Hirayama
- Osaka Prefecture University, Department of Chemical Engineering, Graduate School of Engineering, Osaka, Japan
| | - Hayato Tokumoto
- Osaka Prefecture University, Department of Chemical Engineering, Graduate School of Engineering, Osaka, Japan
| | - Akira Matsuoka
- Kobe Steel, Ltd., Chemical & Environmental Technology Research Section, Mechanical Engineering Research Laboratory, Technical Development Group, Hyogo, Japan
| | - Koji Noishiki
- Kobe Steel, Ltd., Engineering Section, Takasago Equipment Plant, Machinery Business, Hyogo, Japan
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Muto A, Matsumoto T, Tokumoto H. Continuous flow demulsification of a water-in-toluene emulsion by an alternating electric field. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2015.09.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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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Yoshihara A, Nobuhira N, Narahara H, Toyoda S, Tokumoto H, Konishi Y, Nomura T. Estimation of the adhesive force distribution for the flagellar adhesion of Escherichia coli on a glass surface. Colloids Surf B Biointerfaces 2015; 131:67-72. [PMID: 25956746 DOI: 10.1016/j.colsurfb.2015.04.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 04/09/2015] [Accepted: 04/15/2015] [Indexed: 01/20/2023]
Abstract
The effects of the presence or absence of microbial flagella and the microbial motility on the colloidal behaviors of microbial cells were quantitatively evaluated. The microbial cell attachment and detachment processes on a glass surface were observed directly using a parallel-plate flow chamber. Wild-type, flagellar paralyzed, and nonflagellated Escherichia coli strains were used as model microbial cells. In the cell attachment tests, the microbial adhesion rate in a 160mM NaCl solution was approximately 10 times higher than that in a 10mM solution, for all E. coli strains. The colloidal behavior of the microbial cells agreed well with the predictions of the DLVO theory. In addition, the microbial flagella and motility did not significantly affect the cell attachment, regardless of the existence of a potential barrier between the cell and the glass substratum. In the cell detachment tests, the cumulative number of microbial cells detached from the glass substratum with increasing flow rate was fit well with the Weibull distribution function. The list of strains arranged in order of increasing median drag force required to remove them was nonflagellated strain, flagellar paralyzed strain, and wild-type strain. These results indicated that the flagella and the flagellar motility inhibited the cell detachment from the glass substratum. Furthermore, a large external force would likely be required to inhibit the microbial adhesion in the early stage of the biofilm formation.
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Affiliation(s)
- Akinori Yoshihara
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan; Corporate Engineering Center, Corporate Production Management & Engineering Division, Sumitomo Bakelite Co., Ltd., 2100 Takayanagi, Fujieda, Shizuoka 426-0041, Japan.
| | - Noritaka Nobuhira
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hisaya Narahara
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Syunsuke Toyoda
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hayato Tokumoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Yasuhiro Konishi
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Toshiyuki Nomura
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Miyazaki J, Kuriyama Y, Tokumoto H, Konishi Y, Nomura T. Cytotoxicity and behavior of polystyrene latex nanoparticles to budding yeast. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.01.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Yoshihara A, Narahara H, Kuriyama Y, Toyoda S, Tokumoto H, Konishi Y, Nomura T. Measurement of microbial adhesive forces with a parallel plate flow chamber. J Colloid Interface Sci 2014; 432:77-85. [PMID: 25086382 DOI: 10.1016/j.jcis.2014.06.052] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 06/21/2014] [Accepted: 06/23/2014] [Indexed: 11/27/2022]
Abstract
HYPOTHESIS It was predicted that the colloidal behaviors of archaea and bacteria with disparate surface structure were different. In this study, the effects of the physicochemical properties of microbial cell surfaces on colloidal behavior were analyzed with Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, thermodynamics, and powder technology. EXPERIMENTS Cell attachment and detachment from model substrates were directly observed using a parallel plate flow chamber. Gram-negative Escherichia coli and archaeal Methanosarcina barkeri were used as model microbial cells, and positively and negatively charged glass slides were used as model substrates. FINDINGS Microbial adhesion on both substrates agreed well with predictions calculated from DLVO theory, using experimental parameters. The total number of cells detached from the substrates as a function of flow rate was fit with the Weibull distribution function. In addition, the drag force required for detachment, which was estimated from the hydrodynamic forces, had a wide distribution; however, the forces became smaller with increasing ionic strength because of reduced electrostatic interactions between the cells and the substrate. M. barkeri could not be detached from positively charged substrates because it would entail a negative change in the interfacial energy of interaction. Thus adhesion was thermodynamically favored in this case.
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Affiliation(s)
- Akinori Yoshihara
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan; Corporate Engineering Center, Corporate Production Management & Engineering Div., Sumitomo Bakelite Co., Ltd., 2100 Takayanagi, Fujieda, Shizuoka 426-0041, Japan
| | - Hisaya Narahara
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Yuta Kuriyama
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Syunsuke Toyoda
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hayato Tokumoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Yasuhiro Konishi
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Toshiyuki Nomura
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Miyazaki J, Kuriyama Y, Miyamoto A, Tokumoto H, Konishi Y, Nomura T. Adhesion and internalization of functionalized polystyrene latex nanoparticles toward the yeast Saccharomyces cerevisiae. ADV POWDER TECHNOL 2014. [DOI: 10.1016/j.apt.2014.06.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nomura T, Miyazaki J, Miyamoto A, Kuriyama Y, Tokumoto H, Konishi Y. Exposure of the yeast Saccharomyces cerevisiae to functionalized polystyrene latex nanoparticles: influence of surface charge on toxicity. Environ Sci Technol 2013; 47:3417-23. [PMID: 23448545 DOI: 10.1021/es400053x] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Novel nanoparticles with unique physicochemical characteristics are being developed with increasing frequency, leading to higher probability of nanoparticle release and environmental accumulation. Therefore, it is important to assess the potential environmental and biological adverse effects of nanoparticles. In this study, we investigated the toxicity and behavior of surface-functionalized nanoparticles toward yeast (Saccharomyces cerevisiae). The colony count method and confocal microscopy were used to examine the cytotoxicity of manufactured polystyrene latex (PSL) nanoparticles with various functional groups (amine, carboxyl, sulfate, and nonmodified). S. cerevisiae were exposed to PSL nanoparticles (40 mg/L) dispersed in 5-154 mM NaCl solutions for 1 h. Negatively charged nanoparticles had little or no toxic effect. Interestingly, nanoparticles with positively charged amine groups (p-Amine) were not toxic in 154 mM NaCl, but highly toxic in 5 mM NaCl. Confocal microscopy indicated that in 154 mM NaCl, the p-Amine nanoparticles were internalized by endocytosis, whereas in 5 mM NaCl they covered the dead cell surfaces. This demonstrates that nanoparticle-induced cell death might to be related to their adhesion to cells rather than their internalization. Together, these findings identify important factors in determining nanoparticle toxicity that might affect their impact on the environment and human health.
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Affiliation(s)
- Toshiyuki Nomura
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Tokumoto H, Kashiwagi M. Changes in dominant fermentation type during anaerobic digestion of high-loading glycerol with slight glucose content. Bioresour Technol 2012; 126:13-17. [PMID: 23073084 DOI: 10.1016/j.biortech.2012.09.028] [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] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 09/06/2012] [Accepted: 09/09/2012] [Indexed: 06/01/2023]
Abstract
High-loading glycerol containing slight amounts of five different monosaccharides was inoculated with seed sludge obtained from a methane fermentation reactor. The use of different monosaccharides as fermentation promoters resulted in changes in fermentation types; in particular, glucose induced the formation of 1,3-propanediol. After 9 days incubation with glucose, glycerol levels had fallen by 81%, while molar yields of organic acids and 1,3-propanediol (per mole of glycerol degraded) were 0.22 and 0.39, respectively. Other monosaccharides enhanced methane production after 14 days of incubation in the following order: galactose, galacturonic acid, mannose and arabinose. Hydrogen was generated (together with a negligible amount of methane) only in the presence of glucose. When glucose was introduced to a methane-producing reactor (promoted by galacturonic acid), hydrogen production began 5 days later and displaced the methane production after 12 days. These results suggest that glucose catalyzes glycerol degradation, resulting in the production of hydrogen.
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Affiliation(s)
- Hayato Tokumoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Tokumoto H, Tanaka M. Novel anaerobic digestion induced by bacterial components for value-added byproducts from high-loading glycerol. Bioresour Technol 2012; 107:327-332. [PMID: 22209438 DOI: 10.1016/j.biortech.2011.12.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 12/08/2011] [Accepted: 12/10/2011] [Indexed: 05/31/2023]
Abstract
A novel bioprocessing system was developed and tested that involved anaerobic fermentation to degrade high-loading glycerol by a fermentation promoter, and which could be used for the production of important resources. In the absence of a promoter, there was no anaerobic digestion when glycerol (4.0-6.0%, v/v) was added to the reactor. By contrast, glycerol was readily decomposed when sewage sludge, acting as a fermentation promoter, was added to the anaerobic reactor. Fermentation resulted in the generation of hydrogen, 1,3-propanediol (1,3-PDO) and various organic acids. In 7 days, glycerol decomposition reached 88%; hydrogen production was 3.1mg/kg-glycerol (0.0004 g/day/L), and 1,3-PDO yield reached 0.35 kg/kg-glycerol (0.05 g/day/L). Further experiments confirmed that the bacteria Escherichia coli and particularly Schizosaccharomyces pombe (found within sewage sludge) and especially glucose (found within bacterial components (i.e., cell walls)) acted as efficient promoters of fermentation.
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Affiliation(s)
- Hayato Tokumoto
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Gruverman A, Prakash SA, Aggarwal S, Ramesh R, Auciello O, Tokumoto H. Nanoscale Investigation of Polarization Retention Loss in Ferroelectric Thin Films VIA Scanning Force Microscopy. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-493-53] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTScanning force microscopy (SFM) was applied to direct nanoscale investigation of the mechanism of retention loss in ferroelectric thin films. Experiments were conducted by performing local polarization reversal within an individual grain with subsequent imaging of a resulting domain structure at various time intervals. A conductive SFM tip was used for domain switching and imaging in the SFM piezoresponse mode.
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Nomura T, Narahara H, Tokumoto H, Konishi Y. The role of microbial surface properties and extracellular polymer in Lactococcus Lactis aggregation. ADV POWDER TECHNOL 2009. [DOI: 10.1016/j.apt.2009.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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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Yoshida H, Tokumoto H, Ishii K, Ishii R. Efficient, high-speed methane fermentation for sewage sludge using subcritical water hydrolysis as pretreatment. Bioresour Technol 2009; 100:2933-2939. [PMID: 19254834 DOI: 10.1016/j.biortech.2009.01.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Revised: 01/27/2009] [Accepted: 01/27/2009] [Indexed: 05/27/2023]
Abstract
A novel biomass-energy process for the production of methane from sewage sludge using a subcritical water (sub-CW) hydrolysis reaction as pretreatment is proposed. The main substances of sewage sludge hydrolyzed by sub-CW at 513 K for 10 min were acetic acid, formic acid, pyroglutamic acid, alanine, and glycine. Fermentation experiments were conducted in an anaerobic-sludge reactor for two different samples: real sewage sludge and a model solution containing components typically produced by the sub-CW pretreatment of sewage sludge. In the experiment for the sub-CW pretreatment of sewage sludge, methane generation was twice that for non-pretreatment after 3 days of incubation. In the model experiment, the methane conversion was about 40% with the application of mixture of organic acids and amino acids after 5 days of incubation. Furthermore, the methane conversion was about 60% for 2 days when only organic acids, such as acetic acid and formic acid, were applied. Because acetic acid is the key intermediate and main precursor of the methanogenesis step, fermentation experiments were conducted in an anaerobic-sludge reactor with high concentrations of acetic acid (0.01-0.1M). Nearly 100% of acetic acid was converted to methane and carbon dioxide in 1-3 days.
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Affiliation(s)
- Hiroyuki Yoshida
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
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Nomura T, Yoshihara A, Nagao T, Tokumoto H, Konishi Y. Effect of the surface characteristics of Methanosarcina barkeri on immobilization to support materials. ADV POWDER TECHNOL 2007. [DOI: 10.1163/156855207782146599] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Affiliation(s)
- H. Tokumoto
- a Department of Physics , Bedford College , Regent's Park, London , NW1 4NS , England
- b Electrotechnical Laboratory, 1–1–4 Umezono , Sakuramura, Niiharigun , Ibaraki , 305 , Japan
| | - R. Mansfield
- a Department of Physics , Bedford College , Regent's Park, London , NW1 4NS , England
| | - M. J. Lea
- a Department of Physics , Bedford College , Regent's Park, London , NW1 4NS , England
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Ohno H, Nagahara LA, Gwo S, Mizutani W, Tokumoto H. Nanostructural Formation of Self-Assembled Monolayer Films on Cleaved AlGaAs/GaAs Heterojuctions. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259708042827] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- H. Ohno
- a Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
- c Corporate Research and Development Group, Sharp Corporation
| | - L. A. Nagahara
- a Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
| | - S. Gwo
- a Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
- b Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research (NAIR) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
| | - W. Mizutani
- a Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
- b Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research (NAIR) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
| | - H. Tokumoto
- a Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
- b Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research (NAIR) , 1-1-4 Higashi, Tsukuba, Ibaraki , 305 , Japan
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Abstract
Cotton (Gossypium herbaceum L.) fibers elongated almost linearly up to about 20 days post anthesis. The molecular mass of xyloglucans in fiber cell walls decreased gradually during the elongation stage. When enzymatically active (native) cell wall preparations of fibers were autolyzed, the molecular mass of xyloglucans decreased. The decrease was most prominent in wall preparations obtained from the rapidly elongating fibers. The xyloglucan-degrading activity was recovered from the fiber cell walls with 3 mol/L NaCl, and the activity was high at the stages in which fibers elongated vigorously. These results suggest the possible involvement of xyloglucan metabolism in the regulation of cotton fiber elongation.
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Affiliation(s)
- Hayato Tokumoto
- Department of Biological Sciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
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Umemura K, Komatsu J, Uchihashi T, Choi N, Ikawa S, Nishinaka T, Shibata T, Nakayama Y, Katsura S, Mizuno A, Tokumoto H, Ishikawa M, Kuroda R. RecA-double stranded DNA complexes studied by atomic force microscopy. Nucleic Acids Symp Ser 2003:213-4. [PMID: 12903344 DOI: 10.1093/nass/44.1.213] [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] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
RecA-double stranded (ds) DNA complexes have been studied by atomic force microscopy (AFM). When the complexes were prepared in the presence of ATP gamma S, fully covered RecA-dsDNA filaments were observed by AFM. When the concentration of RecA proteins was lower, various lengths of filaments were found. The variation of the observed structures may directly reflect the real distribution of the intermediate complexes in the reaction mixture, as the mixture was simply deposited on a mica surface for AFM observation without special fixation or staining. The use of a carbon nanotube (CNT) AFM tip enabled high resolution to reveal the periodicity of RecA-dsDNA filaments. Our observations demonstrated the potential of the AFM method for the structural studies of the RecA-dsDNA complexes, especially their intermediate states.
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Affiliation(s)
- K Umemura
- Joint Research Center for Atom Technology, 1-1-4 Higashi, Tsukuba, Ibaraki 305-0046, Japan
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Luna M, de Pablo PJ, Colchero J, Gomez-Herrero J, Baro AM, Tokumoto H, Jarvis SP. Interaction forces and conduction properties between multi wall carbon nanotube tips and Au(111). Ultramicroscopy 2003; 96:83-92. [PMID: 12623173 DOI: 10.1016/s0304-3991(02)00401-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We have studied the interaction forces and electrical conduction properties arising between multiwall carbon nanotube tips and the Au(111) surface in air, by means of amplitude modulation scanning force microscopy, also called intermittent contact. We have centered our work on tips with metallic electronic structure and for the specific parameters used we have found a preliminary interaction range where there is no contact between tip and surface. Stable imaging in this non-contact range is possible with multiwall carbon nanotube tips. These tips have also been used to obtain simultaneous topographic and current maps of the surface. They show excellent properties as tips due to their high aspect ratio and durability, as a result of their elastic and non-reactive properties. Correspondingly, multiwall carbon nanotube tips allow high resolution local analysis of electrical conductivity on a nanometer scale.
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Affiliation(s)
- M Luna
- Lab. Nuevas Microscopi;as, Dpto. Física de la Materia Condensada, C-III, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
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Abstract
Double-stranded DNA molecules were patterned by selective adsorption to aminosilane patterns on mica surfaces. Line patterns with 10 microm spacing were made by photolithography and transferred to a polymer stamp. The stamp was then used for applying aminosilane molecules by microcontact-printing technique on mica substrates. We applied DNA in Tris-EDTA (TE) buffer solution on the patterned substrate, and incubated it for 5 min at room temperature. The sample was then rinsed with pure water, and dried with nitrogen gas. Tapping mode force microscopy showed that DNA was adsorbed selectively on the aminosilanized parts of the mica substrate. We also tried to bridge two aluminum electrodes with DNA using AC electrophoresis.
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Affiliation(s)
- M Fujita
- National Institute of Advanced Industrial Science and Technology, Nanotechnology Research Institute, Tsukuba, Japan
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Tokumoto H, Wakabayashi K, Kamisaka S, Hoson T. Changes in the sugar composition and molecular mass distribution of matrix polysaccharides during cotton fiber development. Plant Cell Physiol 2002; 43:411-418. [PMID: 11978869 DOI: 10.1093/pcp/pcf048] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Cotton (Gossypium herbaceum L.) fiber development consists of a fiber elongation stage (up to 20 d post-anthesis) and a subsequent cell wall thickening stage. Cell wall analysis revealed that the extractable matrix (pectic and hemicellulosic) polysaccharides accounted for 30-50% of total sugar content in the fiber elongation stage but less than 3% in the cell wall thickening stage. By contrast, cellulose increased dramatically after the fiber elongation ceased. The amounts of extractable xyloglucans and arabinose- and galactose-containing polymers per seed increased in the early fiber elongation stage and decreased thereafter. The amounts of extractable acidic polymers and non-cellulosic beta-glucans (mainly composed of beta-1,3-glucans) increased in parallel with fiber elongation and then decreased. The molecular masses of extractable non-cellulosic beta-glucans, and arabinose- and galactose-containing polymers decreased during both fiber elongation and cell wall thickening stages. The molecular mass of extractable xyloglucans also decreased during the fiber elongation stage, but this decrease ceased during the cell wall thickening stage. Conversely, the molecular size of acidic polymers in the extractable pectic fraction increased during both stages. Thus, not only the amounts but also the molecular size of the extractable matrix polysaccharides showed substantial changes during cotton fiber development.
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Affiliation(s)
- Hayato Tokumoto
- Department of Biological Sciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku 558-8585 Japan
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Takeda S, Ptak R, Nakamura C, Miyake J, Kageshima M, Jarvis SP, Tokumoto H. Measurement of the length of the a helical section of a peptide directly using atomic force microscopy. Chem Pharm Bull (Tokyo) 2001; 49:1512-6. [PMID: 11767067 DOI: 10.1248/cpb.49.1512] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Using atomic force microscopy (AFM), the length of the alpha-helix structure of poly-L-lysine was investigated by stretching the peptide directly, one molecule at a time. In the absence of urea, many rupturing points that seemed to be due to the breaking of some hydrogen bonds were observed in force-extension curves, while these points were never observed in the presence of 8 M urea. In the presence of 0.4 or 1.6 M urea, both force-extension curve types were observed. Total peptide elongation for each condition was calculated from force-extension curves reflecting the alpha-helix rupturing process. The experimental value of total elongation divided by the theoretical value of total alpha-helix elongation yields the alpha-helix content. This value was compatible with circular dichroism (CD) measurement results. This suggests that peptide conformation and content of the alpha-helix on a single molecule scale can be investigated by direct mechanical measurement using atomic force microscopy.
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Affiliation(s)
- S Takeda
- Tissue Engineering Research Center (TERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan.
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Umemura K, Komatsu J, Uchihashi T, Choi N, Ikawa S, Nishinaka T, Shibata T, Nakayama Y, Katsura S, Mizuno A, Tokumoto H, Ishikawa M, Kuroda R. Atomic force microscopy of RecA--DNA complexes using a carbon nanotube tip. Biochem Biophys Res Commun 2001; 281:390-5. [PMID: 11181060 DOI: 10.1006/bbrc.2001.4333] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report high resolution images of RecA-double stranded (ds) DNA complexes obtained by atomic force microscopy (AFM). When a carbon nanotube (CNT) tip was used, AFM images visualized the 10-nm pitch of RecA-dsDNA complexes and RecA filaments as three-dimensional surface topography without reconstruction analysis. The depth of the notch between two pitches was less than 1 nm. When adsorbed on a soft surface covered with proteins, naked DNA, RecA monomers, RecA hexamers, and short RecA filaments were all clearly resolved in one image. The high resolution images with a CNT tip provided valuable information on the initiation process of RecA-dsDNA complex formation.
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Affiliation(s)
- K Umemura
- Joint Research Center for Atom Technology, 1-1-4 Higashi, Tsukuba, Ibaraki 305-0046, Japan
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Hoson T, Kamisaka S, Wakabayashi K, Soga K, Tabuchi A, Tokumoto H, Okamura K, Nakamura Y, Mori R, Tanimoto E, Takeba G, Nishitani K, Izumi R, Ishioka N, Kamigaichi S, Aizawa S, Yoshizaki I, Shimazu T, Fukui K. Growth regulation mechanisms in higher plants under microgravity conditions - changes in cell wall metabolism. Biol Sci Space 2000; 14:75-96. [PMID: 11543424 DOI: 10.2187/bss.14.75] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
During Space Shuttle STS-95 mission, we cultivated seedlings of rice (Oryza sativa L. cv. Koshihikari and cv. Tan-ginbozu) and Arabidopsis (Arabidopsis thaliana L. cv. Columbia and cv. etr1-1) for 68.5, 91.5, and 136 hr on board, and then analyzed changes in the nature of their cell walls, growth, and morphogenesis under microgravity conditions. In space, elongation growth of both rice coleoptiles and Arabidopsis hypocotyls was stimulated. Also, the increase in the cell wall extensibility, especially that in the irreversible extensibility, was observed for such materials. The analyses of the amounts, the structure, and the physicochemical properties of the cell wall constituents indicated that the decreases in levels and molecular masses of cell wall polysaccharides were induced under microgravity conditions, which appeared to contribute to the increase in the wall extensibility. The activity of certain wall enzymes responsible for the metabolic turnover of the wall polysaccharides was increased in space. By the space flight, we also confirmed the occurrence of automorphogenesis of both seedlings under microgravity conditions; rice coleoptiles showed an adaxial bending, whereas Arabidopsis hypocotyls elongated in random directions. Furthermore, it was shown that spontaneous curvatures of rice coleoptiles in space were brought about uneven modifications of cell wall properties between the convex and the concave sides.
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Tokumoto H. Analysis of HLA-DRB1-related alleles in Japanese patients with lung cancer--relationship to genetic susceptibility and resistance to lung cancer. J Cancer Res Clin Oncol 1998; 124:511-6. [PMID: 9808426 DOI: 10.1007/s004320050207] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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: 11/24/2022]
Abstract
PURPOSE To investigate differences in HLA status among lung cancer patients, patients with hematological malignancies, and healthy controls in order to determine the genetic susceptibility and resistance features of HLA-DRB1-related alleles in Japanese patients with lung cancer. METHODS HLA class I (HLA-A, -B, and -C) antigens and HLA class II (HLA-DRB1) alleles were determined in 36 patients with lung cancer, 35 patients with hematological malignancies, and 90 healthy controls. HLA class I status was investigated by serological techniques, and HLA class II by polymerase chain reaction/restriction-fragment-length polymorphism analysis. RESULTS Lung cancer patients showed an increased frequency of HLA-DRB1*0901, and a decreased frequency of HLA-DRB1*1302 and DRB1*14-related alleles when compared to the other subjects. CONCLUSION These results suggest that genetic factors influence the susceptibility and resistance to lung cancer. However, this study should be considered preliminary because of the relatively small number of patients examined and the possibility of racial differences in HLA status of lung cancer patients between Japan and other countries.
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Affiliation(s)
- H Tokumoto
- Department of Internal Medicine, Komatsu Hospital, Neyagawa Osaka, Japan
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Satoh JI, Tokumoto H, Yukitake M, Matsui M, Matsuyama Z, Kawakami H, Nakamura S, Kuroda Y. Spinocerebellar ataxia type 6: MRI of three Japanese patients. Neuroradiology 1998; 40:222-7. [PMID: 9592791 DOI: 10.1007/s002340050571] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We describe the MRI findings in three Japanese patients with spinocerebellar ataxia type 6 (SCA6) in which a polymorphic CAG repeat was identified in the gene encoding the alpha 1A voltage-dependent P/Q-type Ca2+ channel subunit (CACNL1A4). All showed slowly progressive cerebellar ataxia and mild pyramidal signs. Neuroradiologically, they had moderate cerebellar atrophy, most prominently in the superior vermis, whereas the brain stem appeared to be spared. No abnormal signal intensity was identified.
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Affiliation(s)
- J I Satoh
- Department of Internal Medicine, Saga Medical School, Japan.
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Nagahara L, Nakamura M, Tokumoto H. Investigation of mesoscopic domains in thin organic films using near-field optical absorption mapping. Ultramicroscopy 1998. [DOI: 10.1016/s0304-3991(97)00092-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Urata H, Miyagoshi H, Kakuya H, Tokumoto H, Kawahata T, Otake T, Akagi M. Design and racemic synthesis of conformationally restricted carbocyclic pyrimidine nucleoside analogs based on the structure of the L-nucleoside residue in heterochiral DNA. Chem Pharm Bull (Tokyo) 1998; 46:458-61. [PMID: 9549888 DOI: 10.1248/cpb.46.458] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Carbocyclic pyrimidine nucleoside analogs which have restricted glycosidic conformation at chi approximately 180 degrees were designed, based on the conformational features of the L-nucleotide residue in heterochiral DNA, and synthesized. The synthesis of (+/-)-carbocyclic 6,6'-O-cyclo-2'-deoxyuridine was achieved via bromination and subsequent intramolecular cyclization of carbocyclic 6'beta-hydroxy-2'-deoxyuridine. (+/-)-Carbocyclic 6,6'-O-cyclo-2'-deoxycytidine was synthesized from protected carbocyclic 6,6'-O-cyclo-2'-deoxyuridine via the 4-triazole intermediate.
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Affiliation(s)
- H Urata
- Osaka University of Pharmaceutical Sciences, Takatsuki, Japan
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Satoh JI, Tokumoto H, Kurohara K, Yukitake M, Matsui M, Kuroda Y, Yamamoto T, Furuya H, Shinnoh N, Kobayashi T, Kukita Y, Hayashi K. Adult-onset Krabbe disease with homozygous T1853C mutation in the galactocerebrosidase gene. Unusual MRI findings of corticospinal tract demyelination. Neurology 1997; 49:1392-9. [PMID: 9371928 DOI: 10.1212/wnl.49.5.1392] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A 51-year-old woman developed a slowly progressive spastic paraparesis and diminished vibration sense beginning at age 38. Intellectual capacity was normal. Krabbe disease was confirmed by markedly reduced leukocyte galactocerebrosidase (GALC) activity, typical inclusions in Schwann cell cytoplasm, and an identification of the homozygous point mutation T1835C (Leu618Ser) in the GALC gene. T2-weighted MRI of the brain showed symmetric high-signal-intensity lesions in the bilateral frontoparietal white matter, the centrum semiovale, and the posterior limb of the internal capsule with sparing of the periventricular white matter. This case is unusual because of the late onset, protracted clinical course, and MRI findings of demyelination confined to the corticospinal tracts.
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Affiliation(s)
- J I Satoh
- Division of Neurology, Saga Medical School, Japan
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Kitada C, Yamanaka Y, Tokumoto H, Yoshimura C, Kitajima H, Yonezu S, Fukuhara S. 146 High-dose chemotherapy with PBSCT for small cell lung cancer. Lung Cancer 1997. [DOI: 10.1016/s0169-5002(97)89425-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Tokumoto H, Nomura S, Yamaguchi K, Yoshizumi M, Kamoshida S. [Primary pulmonary hemangiopericytoma detected on routine chest X-ray examination]. Nihon Kyobu Shikkan Gakkai Zasshi 1996; 34:1125-9. [PMID: 8953908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Hemangiopericytoma is a rare tumor originating from pericytes. In May 1988, a 33-year-old man was found to have a well-defined nodular shadow in the right upper lobe during a routine chest X-ray examination. Although the mass had been thought to be benign, in December 1992 it was found to have grown. In May 1993, the patient was referred to our hospital for further examination. A chest X-ray film and a high-resolution CT scan revealed a well-defined nodule in the right upper lung field without vascular gathering or pleural puckering. The tumor was slightly less dense than was soft tissues. There was no evidence suggesting another primary tumor or metastasis. In July 1993, because the mass was suspected to be a low-grade malignant tumor, a segementectomy (rt-S2) was done. On the basis of histologic, immunohistochemical and electronmicroscopic findings, pulmonary hemangiopericytoma was diagnosed. The postoperative course was uneventful. The patient has been well for 2 years and five months after the operation, with no sign of recurrence or metastasis.
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Affiliation(s)
- H Tokumoto
- Department of Internal Medicine, Hyogo Prefectural Amagasaki Hospital, Japan
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Croxtall JD, Choudhury Q, Tokumoto H, Flower RJ. Lipocortin-1 and the control of arachidonic acid release in cell signalling. Glucocorticoids (changed from glucorticoids) inhibit G protein-dependent activation of cPLA2 activity. Biochem Pharmacol 1995; 50:465-74. [PMID: 7646551 DOI: 10.1016/0006-2952(95)00156-t] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In pre-labelled A549 cells epidermal growth factor (EGF) (10 nM) stimulates the release of [5,6,8,9,11,12,14,15-3H(N)]-arachidonic acid (3H-AA) by approximately 70%. Increasing Ca2+i with thapsigargin (50 nM) stimulates 3H-AA release by approximately 120%. However, the combined use of these two agents results in a synergistic stimulation of 3H-AA release by over 700%. The EGF stimulated release is sensitive to pertussis toxin (10 ng/mL) and guanosine 5'-O-(2-thiodiphosphate) suggesting a G protein-mediated event. This is supported by the fact that the G protein activators AlF-4 and guanosine 5'-O-(2-thiotriphosphate) both stimulate 3H-AA release. The stimulation of 3H-AA release by both EGF or direct G protein activation is completely blocked following pre-treatment for 3 hr with 1 nM dexamethasone. This effect is reversed with a neutralizing antibody to lipocortin-1 (1 microgram/mL) suggesting that this protein mediates the inhibitory effects of glucocorticoids on agonist activated 3H-AA release. Thapsigargin stimulation of 3H-AA release is insensitive to dexamethasone treatment. A peptide fragment from the N-terminus of lipocortin-1-Lc13-25 (20-200 micrograms/mL) mimics the effect of glucocorticoid in suppressing both EGF and G protein activated 3H-AA release. A peptide with Me-Tyr substituting Tyr21 is much reduced in activity suggesting that the presence of this residue is essential. As peptide Lc13-25 is not derived from the Ca2+/phospholipid binding domain of the native protein then sequestration of phospholipid substrate for PLA2 remains an unlikely mechanism of action for this peptide.
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Affiliation(s)
- J D Croxtall
- Department of Biochemical Pharmacology, Medical College of St. Bartholomews Hospital, London, U.K
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Kolosov O, Gruverman A, Hatano J, Takahashi K, Tokumoto H. Nanoscale visualization and control of ferroelectric domains by atomic force microscopy. Phys Rev Lett 1995; 74:4309-4312. [PMID: 10058468 DOI: 10.1103/physrevlett.74.4309] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Tokumoto H, Croxtall JD, Flower RJ. Differential role of extra- and intracellular calcium in bradykinin and interleukin 1 alpha stimulation of arachidonic acid release from A549 cells. Biochim Biophys Acta 1994; 1211:301-9. [PMID: 8130263 DOI: 10.1016/0005-2760(94)90154-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The release of arachidonic acid in A549 cells was stimulated in a time- and dose-dependent manner by the Ca2+ ionophore ionomycin (t1/2 = 4 min), thapsigargin (t1/2 = 8 min), bradykinin (t1/2 = 12 min, EC50 = 3 nM), and interleukin 1 alpha (t1/2 = 28 min, EC50 = 0.3 ng/ml). Bradykinin (10 nM) and interleukin 1 alpha (1 ng/ml) stimulation was blocked by the bradykinin B2 receptor antagonist, D-Arg,[Hyp3,Thi5,8, D-Phe7]bradykinin and interleukin 1 receptor antagonist (IC50 = 30 mM and 20 ng/ml, respectively), suggesting receptor mediation. Diacylglycerol release was < 10% of total arachidonic acid release in all cases, suggesting activation of phospholipase A2 activity was greater than phospholipase C activation by these agents. The effects of ionomycin (3 microM) and thapsigargin (0.3 microM) were abolished in Ca(2+)-free buffer with and without 0.5 mM EGTA. Bradykinin (10 nM) stimulation was reduced by 50% in Ca(2+)-free buffer whereas interleukin 1 alpha (1 ng/ml) stimulation remained unaffected. However, the presence of EGTA completely abolished bradykinin stimulation and partially blocked the effect of interleukin 1 alpha (43% inhibition). In the presence of extracellular Ca2+, ionomycin (3 mM), thapsigargin (0.3 mM), bradykinin (10 nM), and interleukin 1 alpha (1 ng/ml) stimulation of arachidonic acid release was blocked by the Ca2+ influx blocker LaCl3 (29, 44, 35, and 41% inhibition, respectively). Nifedipine also blocked ionomycin and thapsigargin stimulation but only partially blocked bradykinin and interleukin 1 alpha stimulation. These results suggest that following B2 receptor activation, cytosolic phospholipase A2 is stimulated by a rise in intracellular Ca2+ levels which are sensitive to the action of EGTA, whereas interleukin 1 alpha stimulation of cytosolic phospholipase A2 is mediated by a rise in intracellular Ca2+ from both EGTA-sensitive and resistant pools. Furthermore the results of ionomycin and thapsigargin indicate that extracellular Ca2+ is important for activation of cytosolic phospholipase A2 in A549 cells.
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Affiliation(s)
- H Tokumoto
- Ono Pharmaceutical Co., Minase Research Institute, Osaka, Japan
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Kolosov O, Ogiso H, Tokumoto H, Yamanaka K. Elastic Imaging with Nanoscale and Atomic Resolution by Ultrasonic Force Microscopy (UFM). Nanostructures and Quantum Effects 1994. [DOI: 10.1007/978-3-642-79232-8_50] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Tokumoto H, Croxtall JD, Choudhury Q, Flower RJ. Phospholipase A2-induced stimulation of A549 lung adenocarcinoma cell line proliferation. Biochim Biophys Acta 1993; 1169:236-42. [PMID: 7548116 DOI: 10.1016/0005-2760(93)90246-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Phospholipase A2 (PLA2) activity was found in the cytosolic fraction of the A549 human lung adenocarcinoma line. This PLA2 had a molecular mass of approximately 70 kDa as assessed by gel filtration chromatography and required submicromolar concentrations of calcium concentrations for optimal activity. These characteristics are consistent with the cytosolic PLA2 recently reported in other cell types, such as U937 cells. We have now demonstrated that A549 cell PLA2 (PLA2 activity: 1 unit/ml) partially purified by gel filtration stimulated proliferation of A549 cells by 50% after 3 days of culture. Similarly, porcine pancreatic PLA2 (0.1 unit/ml) also promoted proliferation of A549 cell cultures by 42%. Furthermore, A549 cell PLA2 stimulated prostaglandin E2 release (approx. 7-fold increase). Both PLA2s lost activity when treated with p-bromophenacyl bromide. Neither porcine pancreatic PLA2 nor A549 cell PLA2 reversed the inhibitory activities of dexamethasone and indomethacin on cell growth. These results suggest that both of these PLA2s stimulate A549 cell growth, and that this is likely to be mediated by increased eicosanoid production.
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Affiliation(s)
- H Tokumoto
- Department of Biochemical Pharmacology, William Harvey Research Institute, Medical College of St. Bartholomew's Hospital, London, UK
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Hibino H, Fukuda T, Suzuki M, Homma Y, Sato T, Iwatsuki M, Miki K, Tokumoto H. High-temperature scanning-tunneling-microscopy observation of phase transitions and reconstruction on a vicinal Si(111) surface. Phys Rev B Condens Matter 1993; 47:13027-13030. [PMID: 10005518 DOI: 10.1103/physrevb.47.13027] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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