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Oiwa T, Nakamizo S, Nomura T, Tomari K, Horiguchi Y, Kabashima K. Reduction of E-cadherin expression in the lesion of molluscum contagiosum: A possible explanation for the lack of Langerhans cells. J Dermatol 2021; 48:e600-e601. [PMID: 34545622 DOI: 10.1111/1346-8138.16171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 11/27/2022]
Affiliation(s)
- Tomohiro Oiwa
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Satoshi Nakamizo
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Takashi Nomura
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Kaori Tomari
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | | | - Kenji Kabashima
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
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2
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Nakamizo S, Dutertre CA, Khalilnezhad A, Zhang XM, Lim S, Lum J, Koh G, Foong C, Yong PJA, Tan KJ, Sato R, Tomari K, Yvan-Charvet L, He H, Guttman-Yassky E, Malleret B, Shibuya R, Iwata M, Janela B, Goto T, Lucinda TS, Tang MBY, Theng C, Julia V, Hacini-Rachinel F, Kabashima K, Ginhoux F. Single-cell analysis of human skin identifies CD14+ type 3 dendritic cells co-producing IL1B and IL23A in psoriasis. J Exp Med 2021; 218:212481. [PMID: 34279540 PMCID: PMC8292131 DOI: 10.1084/jem.20202345] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 04/03/2021] [Accepted: 06/15/2021] [Indexed: 12/27/2022] Open
Abstract
Inflammatory skin diseases including atopic dermatitis (AD) and psoriasis (PSO) are underpinned by dendritic cell (DC)-mediated T cell responses. Currently, the heterogeneous human cutaneous DC population is incompletely characterized, and its contribution to these diseases remains unclear. Here, we performed index-sorted single-cell flow cytometry and RNA sequencing of lesional and nonlesional AD and PSO skin to identify macrophages and all DC subsets, including the newly described mature LAMP3+BIRC3+ DCs enriched in immunoregulatory molecules (mregDC) and CD14+ DC3. By integrating our indexed data with published skin datasets, we generated a myeloid cell universe of DC and macrophage subsets in healthy and diseased skin. Importantly, we found that CD14+ DC3s increased in PSO lesional skin and co-produced IL1B and IL23A, which are pathological in PSO. Our study comprehensively describes the molecular characteristics of macrophages and DC subsets in AD and PSO at single-cell resolution, and identifies CD14+ DC3s as potential promoters of inflammation in PSO.
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Affiliation(s)
- Satoshi Nakamizo
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Skin Research Institute of Singapore, Agency for Science, Technology and Research, Singapore.,Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Charles-Antoine Dutertre
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Program in Emerging Infectious Disease, Duke-NUS Medical School, Singapore.,Translational Immunology Institute, Singhealth/Duke-NUS Academic Medical Centre, Singapore
| | - Ahad Khalilnezhad
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Department of Microbiology and Immunology, Immunology Translational Research Programme, Yong Loo Lin School of Medicine, Immunology Programme, Life Sciences Institute, National University of Singapore, Singapore
| | - Xiao Meng Zhang
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore
| | - Shawn Lim
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore
| | - Josephine Lum
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore
| | - Geraldine Koh
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore
| | | | | | - Kahbing Jasmine Tan
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Skin Research Institute of Singapore, Agency for Science, Technology and Research, Singapore
| | - Reiko Sato
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Kaori Tomari
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Laurent Yvan-Charvet
- Institut National de la Santé et de la Recherche Médicale U1065, Centre Mediterraneen de Medecine Moleculaire, Atip-Avenir, Nice, France
| | - Helen He
- Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Emma Guttman-Yassky
- Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Benoit Malleret
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Department of Microbiology and Immunology, Immunology Translational Research Programme, Yong Loo Lin School of Medicine, Immunology Programme, Life Sciences Institute, National University of Singapore, Singapore
| | - Rintaro Shibuya
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Masashi Iwata
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Baptiste Janela
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Singapore
| | - Tsuyoshi Goto
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto, Japan
| | | | | | | | | | | | - Kenji Kabashima
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Skin Research Institute of Singapore, Agency for Science, Technology and Research, Singapore.,Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto, Japan
| | - Florent Ginhoux
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.,Skin Research Institute of Singapore, Agency for Science, Technology and Research, Singapore.,Translational Immunology Institute, Singhealth/Duke-NUS Academic Medical Centre, Singapore.,Shanghai Institute of Immunology, Shanghai JiaoTong University School of Medicine, Shanghai, China
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3
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Nakamizo S, Honda T, Sato T, Al Mamun M, Chow Z, Duan K, Lum J, Tan KJ, Tomari K, Sato R, Kitoh A, Tay ASL, Common JEA, Guan NL, Setou M, Ginhoux F, Kabashima K. High-fat diet induces a predisposition to follicular hyperkeratosis and neutrophilic folliculitis in mice. J Allergy Clin Immunol 2021; 148:473-485.e10. [PMID: 33713763 DOI: 10.1016/j.jaci.2021.02.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 10/02/2020] [Revised: 02/23/2021] [Accepted: 02/26/2021] [Indexed: 01/22/2023]
Abstract
BACKGROUND Neutrophilic folliculitis is an inflammatory condition of hair follicles. In some neutrophilic folliculitis, such as in patients with acne and hidradenitis suppurativa, follicular hyperkeratosis is also observed. Neutrophilic folliculitis is often induced and/or exacerbated by a high-fat diet (HFD). However, the molecular mechanisms by which an HFD affects neutrophilic folliculitis are not fully understood. OBJECTIVE Our aim was to elucidate how an HFD promotes the development of neutrophilic folliculitis. METHODS Mice were fed an HFD, and their skin was subjected to histologic, RNA sequencing, and imaging mass spectrometry analyses. To examine the effect of an HFD on neutrophil accumulation around the hair follicles, phorbol 12-myristate 13-acetate (PMA) was used as an irritant to the skin. RESULTS Histologic analysis revealed follicular hyperkeratosis in the skin of HFD-fed mice. RNA sequencing analysis showed that genes related to keratinization, especially in upper hair follicular keratinocytes, were significantly upregulated in HFD-fed mice. Application of PMA to the skin induced neutrophilic folliculitis in HFD-fed mice but not in mice fed a normal diet. Accumulation of neutrophils in the skin and around hair follicles was dependent on CXCR2 signaling, and CXCL1 (a CXCR2 ligand) was produced mainly by hair follicular keratinocytes. Imaging mass spectrometry analysis revealed an increase in fatty acids in the skin of HFD-fed mice. Application of these fatty acids to the skin induced follicular hyperkeratosis and caused PMA-induced neutrophilic folliculitis even in mice fed a normal diet. CONCLUSION An HFD can facilitate the development of neutrophilic folliculitis with the induction of hyperkeratosis of hair follicles and increased neutrophil infiltration around the hair follicles via CXCR2 signaling.
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Affiliation(s)
- Satoshi Nakamizo
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore; Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore; Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Tetsuya Honda
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan; Department of Dermatology, School of Medicine, Hamamatsu University, Hamamatsu, Shizuoka, Japan.
| | - Tomohito Sato
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Md Al Mamun
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Zachary Chow
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore
| | - Kaibo Duan
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore
| | - Josephine Lum
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore
| | - Kahbing Jasmine Tan
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore; Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore
| | - Kaori Tomari
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Reiko Sato
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore; Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Akihiko Kitoh
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Angeline S L Tay
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore
| | - John E A Common
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore
| | - Ng Lai Guan
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore
| | - Mitsutoshi Setou
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Florent Ginhoux
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore; Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore.
| | - Kenji Kabashima
- Singapore Immunology Network, Agency for Science, Technology and Research, Biopolis, Singapore; Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biopolis, Singapore; Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
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4
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Watanabe D, Ishiaku US, Nagaoka T, Tomari K, Hamada H. Flow Behavior of Sandwich Injection Molding in Sequential and Simultaneous Injection. INT POLYM PROC 2013. [DOI: 10.3139/217.1735] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The flow behavior of skin and core materials in co-injection molding was investigated to understand the flow patterns that could lead to core breakthrough in sequential and simultaneous injection molding. A spiral-flow mold was used and the core material was loaded with a black master batch to facilitate the monitoring of the core material. PC/ABS blend was used as the skin material and ABS was the core material. It was revealed irrespective of simultaneous injection time, sandwich injection molding display the four flow regions identified earlier i. e. primary injection region, core advance region, core expansion region and core breakthrough region. The flow length of core expansion region lengthened with increasing simultaneous injection time of skin and core material while the overall injection time decreased. It was also observed that the core became thinner and wider with increasing simultaneous injection time.
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Affiliation(s)
- D. Watanabe
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - U. S. Ishiaku
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - T. Nagaoka
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - K. Tomari
- Osaka Municipal Technical Research Institute, Osaka, Japan
| | - H. Hamada
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
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Abstract
Abstract
The morphology of injection molded polyacetal was investigated using spiral-flow test mold and shear effect on crystallization phenomena is discussed. Morphology differed for skin, shear and core layers. The thickness of the shear layer was proportional to flow time.
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Affiliation(s)
- W. Mizuno
- Toyama Industrial Technology Center, Toyama, Japan
| | - K. Tomari
- Osaka Municipal Technical Research Institute, Joto-ku, Osaka, Japan
| | - H. Hamada
- Kyoto Institute of Technology, Kyoto, Japan
| | - Z. Maekawa
- Kyoto Institute of Technology, Kyoto, Japan
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6
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Watanabe D, Ishiaku US, Nagaoka T, Tomari K, Hamada H. The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding. INT POLYM PROC 2013. [DOI: 10.3139/217.1787] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The processing conditions that exert influence on the occurrence of breakthrough during sandwich injection molding were investigated. A spiral flow mold mounted on a twin-barrel injection machine fitted with a single nozzle was used. The effect of mold cavity thickness and the effects of skin material cylinder temperature on skin material viscosity, melt strength, and drawing ratio were considered. Scanning electron microscopy was used to study the morphology of the skin material at the flow front. It was found that the flow length at core expansion region increased and breakthrough phenomenon was delayed as the thickness of the mold cavity increased. When cylinder temperature is increased, the viscosity is lowered and the flow front of the skin material extends with greater ease when pushed by the core material, thus, a greater core volume can be accommodated. As the flow front progresses, the tendency is that the skin material becomes thinner. Polishing and etching followed by SEM examination of the skin material at the flow front revealed that the skin material is oriented perpendicular to the flow direction and the extent of orientation increases with increasing cylinder temperature. This further supported the observation that the deformation ratio and drawing ratio increased with increasing cylinder temperature.
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Affiliation(s)
- D. Watanabe
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - U. S. Ishiaku
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - T. Nagaoka
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - K. Tomari
- Osaka Municipal Technical Research Institute, Osaka, Japan
| | - H. Hamada
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
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7
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Watanabe D, Ishiaku US, Nagaoka T, Tomari K, Hamada H. The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding. INT POLYM PROC 2013. [DOI: 10.3139/217.17522] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The processing variables that control the occurrence of breakthrough phenomenon in sandwich injection molding were investigated. Particular attention was paid to the conditions that would yield an optimum sandwich molded part. The effects of variation of core volume ratio that would yield optimum core shot size, injection speed and the skin/core viscosity ratio were examined. The flow morphology at the various stages of flow was also explored. The study was conducted with a bar-flow mold mounted on a twin-barrel injection machine fitted with a common nozzle. It was noted that the core material flow distance depends on the core cylinder screw metering position (core shot size). At the stage at which the core material completely penetrated through the skin material (breakthrough), four distinct regions of flow could be identified. The flow distance of the core material is controlled by the injection speed of the core material while the injection speed of the skin material is of little significance. In order to increase the flow distance of the core material, it is effective to increase the core material injection speed albeit limited by an optimum value of screw metering position. It was found that the flow distance of the core material was longer when the core material viscosity was lower than that of the skin material but breakthrough occurred much earlier so core volume is limited. Breakthrough failed to occur when the viscosity of the core material was higher than that of the skin material. It was found that optimum core volume and core distribution occurred when skin/core viscosities were intermediate. The morphology of the skin material leading to breakthrough was also analyzed.
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Affiliation(s)
- D. Watanabe
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - U. S. Ishiaku
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - T. Nagaoka
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
| | - K. Tomari
- Osaka Municipal Technical Research Institute, Osaka, Japan
| | - H. Hamada
- Advanced Fibro Science, Kyoto Institute of Technology, Kyoto, Japan
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Abstract
Recently, it has been described that basophils play an essential role in antibody-mediated acquired immunity against ticks in mice. However, it is still unknown whether basophil infiltration has any significance in the infestation with ticks in humans. In this report, we have evaluated the infiltration of basophils into human skin lesions of tick bites.
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Affiliation(s)
- Kyoko Nakahigashi
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
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9
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Torisu T, Kaku N, Tumura H, Taira H, Tomari K. 3M integral bipolar cup system for dysplastic osteoarthritis. Clinical and radiographic review with five- to seven-year follow-up. J Bone Joint Surg Br 2003; 85:822-5. [PMID: 12931798] [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: 04/21/2023]
Abstract
Between 1995 and 1997 we undertook 40 bipolar hip arthroplasties in 35 patients with dysplastic osteoarthritis. The steep and shallow acetabulum was excavated and the bipolar socket was placed high with an adjustment of leg-length. At follow-up of between five and seven years, there were 19 excellent, 16 good and five fair results according to the scoring system of Merle d'Aubigné and Postel. The mean radiographic superior migration of the bipolar socket was 2.1 mm (0 to 10). Osteolysis was noted in three hips within three years of the operation. Abduction on weight-bearing was recorded in 24 hips and the bipolar system was found to be functioning predominantly between the inner bearing and the metal femoral head in 20.
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Affiliation(s)
- T Torisu
- Department of Orthopaedic Surgery and Oncological Science, Faculty of Medicine, Oita Medical University and Shinbeppu Hospital, Japan
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10
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Abstract
Between 1995 and 1997 we undertook 40 bipolar hip arthroplasties in 35 patients with dysplastic osteoarthritis. The steep and shallow acetabulum was excavated and the bipolar socket was placed high with an adjustment of leg-length. At follow-up of between five and seven years, there were 19 excellent, 16 good and five fair results according to the scoring system of Merle d’Aubigné and Postel. The mean radiographic superior migration of the bipolar socket was 2.1 mm (0 to 10). Osteolysis was noted in three hips within three years of the operation. Abduction on weight-bearing was recorded in 24 hips and the bipolar system was found to be functioning predominantly between the inner bearing and the metal femoral head in 20.
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Affiliation(s)
- T. Torisu
- Department of Orthopaedic Surgery and Oncological Science, Faculty of Medicine, Oita Medical University, Hasama-cho, Oita 879-5593, Japan
| | - N. Kaku
- Department of Orthopaedic Surgery and Oncological Science, Faculty of Medicine, Oita Medical University, Hasama-cho, Oita 879-5593, Japan
| | - H. Tumura
- Department of Orthopaedic Surgery and Oncological Science, Faculty of Medicine, Oita Medical University, Hasama-cho, Oita 879-5593, Japan
| | - H. Taira
- Department of Orthopaedic Surgery and Oncological Science, Faculty of Medicine, Oita Medical University, Hasama-cho, Oita 879-5593, Japan
| | - K. Tomari
- Section of Orthopaedic Surgery, Shinbeppu Hospital, 3898 Tsurumi Beppu, Oita 874-0833, Japan
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Shingu M, Obata K, Ezaki I, Tomari K, Fujikawa Y, Wada T, Nonaka S, Suenaga Y, Iwata K, Nobunaga M. [Stromelysin-1 (MMP-3) level in the sera from patients with rheumatoid arthritis and other connective tissue diseases--clinical significances in early onset rheumatoid arthritis]. Ryumachi 1995; 35:15-24. [PMID: 7732485] [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: 01/26/2023]
Abstract
Stromelysin-1 (MMP-3) is a metalloproteinase that degrades articular cartilage matrix in patients with rheumatoid arthritis (RA). We measured MMP-3 in the sera from patients with RA and other connective tissue diseases using specific sandwich EIA and studied its clinical significance in early onset RA. MMP-3 level in healthy control (n = 170) was significantly higher in male than in female. The level of MMP-3 in RA was significantly and dramatically higher than in healthy control, osteoarthritis, systemic lupus erythematosus, progressive systemic sclerosis, primary sjogren's syndrome, mixed connective tissue disease, gouty arthritis and traumatic arthritis. Serum MMP-3 significantly correlated with serum BUN or serum creatinine levels in SLE patients but not in RA patients. In early onset RA, serum MMP-3 level was significantly elevated. Furthermore, when the relationship between the serum MMP-3 level and X-ray findings of the joints in RA was studied, it was found that MMP-3 level was elevated even in stage I or II and that there was no statistical differences between stage I or II and stage III or IV, suggesting that serum MMP-3 level is elevated in the early stage of initial inflammatory process when only mild cartilage degradation is seen. These results suggest that measurements of serum MMP-3 is an important tool for establishing diagnosis of early onset RA, and that serum MMP-3 level may be a marker of cartilage destruction and of estimating therapeutic efficacy in early onset RA.
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Affiliation(s)
- M Shingu
- Department of Clinical Immunology, Kyushu University, Beppu-city
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12
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Shingu M, Isayama T, Yasutake C, Naono T, Nobunaga M, Tomari K, Horie K, Goto Y. Role of oxygen radicals and IL-6 in IL-1-dependent cartilage matrix degradation. Inflammation 1994; 18:613-23. [PMID: 7843804 DOI: 10.1007/bf01535259] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
It has been suggested that IL-1 produces cartilage matrix degradation by metalloproteinases such as collagenase and that such degradation is regulated by metalloproteinase inhibitors. In the present study, the effects of IL-6 and oxygen radical scavengers on cartilage matrix degradation were studied. Superoxide dismutase, catalase, or methionine all significantly inhibited cartilage matrix degradation both in IL-1 beta-stimulated and unstimulated experimental conditions. Both 10 mM EDTA and 100 nM tissue inhibitor of metalloproteinase (TIMP) significantly inhibited cartilage matrix degradation. The addition of methionine significantly inhibited collagenase activity produced in the culture supernatants of chondrocytes stimulated with IL-1 beta. IL-6 significantly suppressed cartilage matrix degradation produced spontaneously or by IL-1 beta stimulation in chondrocytes. IL-6 inhibited superoxide production by chondrocytes both in IL-1 beta-stimulated or unstimulated conditions. These results suggest that oxygen radicals are involved in cartilage matrix degradation mediated by both paracrine and autocrine IL-1 mechanisms and that oxygen radical-mediated activation of collagenase in chondrocytes may explain the mechanisms of how oxygen radicals are involved in cartilage matrix degradation. IL-6 inhibited superoxide production in chondrocytes and thus inhibited cartilage matrix degradation.
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Affiliation(s)
- M Shingu
- Department of Clinical Immunology, Kyushu University, Beppu, Japan
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13
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Tomari K, Harada T, Maekawa Z, Hamada H, Iwamoto M, Ukai A. Fracture toughness of weldlines in thermoplastic injection molding. POLYM ENG SCI 1993. [DOI: 10.1002/pen.760331509] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Tomari K, Tonogai S, Harada T, Hamada H, Lee K, Morii T, Maekawa Z. The V-notch at weld lines in polystyrene injection moldings. POLYM ENG SCI 1990. [DOI: 10.1002/pen.760301508] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Affiliation(s)
- H. Hamada
- Kyoto Institute of Technology, Kyoto, Japan
| | - Z. Maekawa
- Kyoto Institute of Technology, Kyoto, Japan
| | - T. Horino
- Kyoto Institute of Technology, Kyoto, Japan
| | - K. Lee
- Kyoto Institute of Technology, Kyoto, Japan
| | - K. Tomari
- Osaka Municipal Technical Research Institute, Osaka, Japan
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16
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Morita F, Kondo S, Tomari K, Minowa O, Ikura M, Hikichi K. Calcium binding and conformation of regulatory light chains of smooth muscle myosin of scallop. J Biochem 1985; 97:553-61. [PMID: 4008468 DOI: 10.1093/oxfordjournals.jbchem.a135090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Calcium binding was studied with two regulatory light chains (RLC-a and RLC-b) of smooth muscle myosin of scallop. With the equilibrium dialysis method, the binding of 0.98 mol Ca2+ per mol of RLC-b was observed with a dissociation constant of 2.3 X 10(-5) M. Similar values for RLC-b, 1.9 X 10(-5) M, and RLC-a, 1.5 X 10(-5) M, were obtained by measuring the difference absorption spectrum induced by Ca2+. The difference molar absorption coefficient at 288 nm was 159 and 209 M-1 X cm-1 for RLC-a and RLC-b, respectively, while it was -34 M-1 X cm-1 for the regulatory light chain of striated muscle myosin of scallop (RLC-st). Proton NMR spectra of the three light chains were very similar to each other and were broader than those of other Ca2+ binding proteins, parvalbumin and calmodulin. The regulatory light chains may be more rigid than in these Ca2+ binding proteins. CD spectra were measured for the three light chains, and the estimated helix contents were 27, 29, and 24%, respectively, for RLC-a, RLC-b, and RLC-st. All these results in comparison with the primary structures led us to suppose that the polypeptide of regulatory light chains is folded in such a way that domain 4 becomes near to the calcium binding site of domain 1. The decrease in intact light chains on trypsin digestion was determined for the gel electrophoretic patterns. RLC-a was 6 times more susceptible to the tryptic digestion than RLC-b.(ABSTRACT TRUNCATED AT 250 WORDS)
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