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Weeden CE, Gayevskiy V, Marceaux C, Batey D, Tan T, Yokote K, Ribera NT, Clatch A, Christo S, Teh CE, Mitchell AJ, Trussart M, Rankin LC, Obers A, McDonald JA, Sutherland KD, Sharma VJ, Starkey G, D'Costa R, Antippa P, Leong T, Steinfort D, Irving L, Swanton C, Gordon CL, Mackay LK, Speed TP, Gray DHD, Asselin-Labat ML. Early immune pressure initiated by tissue-resident memory T cells sculpts tumor evolution in non-small cell lung cancer. Cancer Cell 2023; 41:837-852.e6. [PMID: 37086716 DOI: 10.1016/j.ccell.2023.03.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 02/05/2023] [Accepted: 03/24/2023] [Indexed: 04/24/2023]
Abstract
Tissue-resident memory T (TRM) cells provide immune defense against local infection and can inhibit cancer progression. However, it is unclear to what extent chronic inflammation impacts TRM activation and whether TRM cells existing in tissues before tumor onset influence cancer evolution in humans. We performed deep profiling of healthy lungs and lung cancers in never-smokers (NSs) and ever-smokers (ESs), finding evidence of enhanced immunosurveillance by cells with a TRM-like phenotype in ES lungs. In preclinical models, tumor-specific or bystander TRM-like cells present prior to tumor onset boosted immune cell recruitment, causing tumor immune evasion through loss of MHC class I protein expression and resistance to immune checkpoint inhibitors. In humans, only tumors arising in ES patients underwent clonal immune evasion, unrelated to tobacco-associated mutagenic signatures or oncogenic drivers. These data demonstrate that enhanced TRM-like activity prior to tumor development shapes the evolution of tumor immunogenicity and can impact immunotherapy outcomes.
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Affiliation(s)
- Clare E Weeden
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Velimir Gayevskiy
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Claire Marceaux
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Daniel Batey
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
| | - Tania Tan
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
| | - Kenta Yokote
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
| | - Nina Tubau Ribera
- Advanced Technology and Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
| | - Allison Clatch
- Department of Microbiology and Immunology, the University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Parkville, VIC, Australia
| | - Susan Christo
- Department of Microbiology and Immunology, the University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Parkville, VIC, Australia
| | - Charis E Teh
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Andrew J Mitchell
- Materials Characterisation and Fabrication Platform, Department of Chemical Engineering, the University of Melbourne, Parkville, VIC, Australia
| | - Marie Trussart
- Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
| | - Lucille C Rankin
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Andreas Obers
- Department of Microbiology and Immunology, the University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Parkville, VIC, Australia
| | - Jackson A McDonald
- ACRF Stem Cells and Cancer Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Kate D Sutherland
- ACRF Stem Cells and Cancer Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia
| | - Varun J Sharma
- Department of Surgery, University of Melbourne, Parkville, VIC, Australia; Liver and Intestinal Transplant Unit, Austin Health, Heidelberg, VIC, Australia; Department of Cardiothoracic Surgery, Austin Health, Heidelberg, VIC, Australia
| | - Graham Starkey
- Department of Surgery, University of Melbourne, Parkville, VIC, Australia; Liver and Intestinal Transplant Unit, Austin Health, Heidelberg, VIC, Australia
| | - Rohit D'Costa
- DonateLife Victoria, Carlton, VIC, Australia; Department of Intensive Care Medicine, Melbourne Health, Melbourne, VIC, Australia
| | - Phillip Antippa
- Department of Surgery, University of Melbourne, Parkville, VIC, Australia; The Royal Melbourne Hospital, Parkville, VIC, Australia
| | - Tracy Leong
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia; Department of Respiratory and Sleep Medicine, Austin Health, Heidelberg, VIC, Australia
| | - Daniel Steinfort
- Department of Medicine, the University of Melbourne, Parkville, VIC, Australia; The Royal Melbourne Hospital, Parkville, VIC, Australia
| | - Louis Irving
- Department of Medicine, the University of Melbourne, Parkville, VIC, Australia; The Royal Melbourne Hospital, Parkville, VIC, Australia
| | - Charles Swanton
- Cancer Research UK Lung Cancer Centre of Excellence, University College London Cancer Institute, London, UK; Cancer Evolution and Genome Instability Laboratory, Francis Crick Institute, London, UK; Department of Oncology, University College London Hospitals, London, UK
| | - Claire L Gordon
- Department of Microbiology and Immunology, the University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Parkville, VIC, Australia; Department of Infectious Diseases, Austin Health, Heidelberg, VIC, Australia; North Eastern Public Health Unit, Austin Health, Heidelberg, VIC, Australia
| | - Laura K Mackay
- Department of Microbiology and Immunology, the University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Parkville, VIC, Australia
| | - Terence P Speed
- Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; School of Mathematics and Statistics, the University of Melbourne, Parkville, VIC, Australia
| | - Daniel H D Gray
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia.
| | - Marie-Liesse Asselin-Labat
- Personalised Oncology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Medical Biology, the University of Melbourne, Parkville, VIC, Australia.
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Yamashita S, Arai H, Yokote K, Araki E, Hounslow N, Ikeda K, Nojima T, Suganami H, Ishibashi S. Response of lipoproteins to a meal tolerance test in patients with type 2 diabetes and hypertriglyceridemia. Atherosclerosis 2022. [DOI: 10.1016/j.atherosclerosis.2022.06.429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Hino Y, Muraosa Y, Oguchi M, Yahiro M, Yarita K, Watanabe A, Sakaida E, Yokote K, Kamei K. Drain outlets in patient rooms as sources for invasive fusariosis: an analysis of patients with haematological disorders. J Hosp Infect 2020; 105:S0195-6701(20)30204-8. [PMID: 32360338 DOI: 10.1016/j.jhin.2020.04.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 04/21/2020] [Indexed: 01/03/2023]
Abstract
BACKGROUND Invasive fusariosis (IF) is a frequently fatal disease as there are few antifungals to treat it, making the prevention of IF crucial. However, fusarium infections have not been as thoroughly studied as other common pathogenic fungi such as Aspergillus or Candida. AIM To investigate the epidemiology of IF in patients with haematological diseases in Japan and to elucidate the infectious route of fusarium infection. METHODS We retrospectively analysed 29 IF cases in patients with haematological diseases from 2009 to 2019 in Japan. To discover the infectious source of IF, we performed an indoor environment survey targeted at indoor air and drain outlets in medical institutions and residences using culture-based and metagenomic methods. Finally, we performed aerosol- and droplet-mediated dispersion studies. FINDINGS The epidemiological study showed that the primary pathogen of IF was Fusarium solani species complex (FSSC), and the most common species was Fusarium petroliphilum. Most patients were likely to develop IF during hospitalization. A fusarium culture was positive in 26 of 72 drain samples. Few fusarium were detected from air samples; by contrast, 29 of 108 isolates from the drain outlets were identified as fusarium. Furthermore, similar results were obtained in the metagenomic analysis. Interestingly, species belonging to FSSC were isolated from indoor drain outlets, which was similar to those of the IF patients. In the droplet-mediated dispersion study, eight to 17 colonies of fusarium were isolated. CONCLUSION Our study indicates that causative Fusarium spp. could inhabit drain outlets in hospitals or residences, and droplet-mediated fusarium dispersion is a potential cause of IF.
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Affiliation(s)
- Y Hino
- Medical Mycology Research Center, Chiba University, Chiba, Japan; Department of Haematology, Chiba University Hospital, Chiba, Japan; Department of Endocrinology, Haematology and Gerontology, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Y Muraosa
- Medical Mycology Research Center, Chiba University, Chiba, Japan.
| | - M Oguchi
- Medical Mycology Research Center, Chiba University, Chiba, Japan
| | - M Yahiro
- Medical Mycology Research Center, Chiba University, Chiba, Japan
| | - K Yarita
- Medical Mycology Research Center, Chiba University, Chiba, Japan
| | - A Watanabe
- Medical Mycology Research Center, Chiba University, Chiba, Japan
| | - E Sakaida
- Department of Haematology, Chiba University Hospital, Chiba, Japan; Department of Endocrinology, Haematology and Gerontology, Chiba University Graduate School of Medicine, Chiba, Japan
| | - K Yokote
- Department of Endocrinology, Haematology and Gerontology, Chiba University Graduate School of Medicine, Chiba, Japan
| | - K Kamei
- Medical Mycology Research Center, Chiba University, Chiba, Japan
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Koshizaka M, Ishikawa T, Maezawa Y, Takemoto M, Tokuyama Y, Saito T, Yokote K. RELATIONSHIP BETWEEN SILENT HYPOGLYCEMIA AND TREATMENTS, OR HBA1C IN ELDERLY PATIENTS WITH DIABETES. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | | | | | | | | | - T. Saito
- Kashiwado Hospital, Chiba, Japan
| | - K. Yokote
- Chiba University, Chiba, Chiba, Japan,
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5
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Masaki H, Kawai N, Matsumoto K, Musgrave M, Yamashita Y, Kobayashi K, Ishikawa T, Yokote K. DEVELOPMENT OF QUALITY INDICATORS FOR CONTINUITY AND COORDINATION OF CARE IN ELDERS IN JAPAN. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | | | - K. Matsumoto
- Kawasaki University of Medical Welfare, Kurashiki, Japan
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Togasaki E, Takeda J, Yoshida K, Shiozawa Y, Takeuchi M, Oshima M, Saraya A, Iwama A, Yokote K, Sakaida E, Hirase C, Takeshita A, Imai K, Okumura H, Morishita Y, Usui N, Takahashi N, Fujisawa S, Shiraishi Y, Chiba K, Tanaka H, Kiyoi H, Ohnishi K, Ohtake S, Asou N, Kobayashi Y, Miyazaki Y, Miyano S, Ogawa S, Matsumura I, Nakaseko C, Naoe T. Frequent somatic mutations in epigenetic regulators in newly diagnosed chronic myeloid leukemia. Blood Cancer J 2017; 7:e559. [PMID: 28452984 PMCID: PMC5436079 DOI: 10.1038/bcj.2017.36] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [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: 02/17/2017] [Accepted: 03/06/2017] [Indexed: 01/30/2023] Open
Abstract
Although tyrosine kinase inhibitors (TKIs) have significantly improved the prognosis of chronic myeloid leukemia (CML), the ability of TKIs to eradicate CML remains uncertain and patients must continue TKI therapy for indefinite periods. In this study, we performed whole-exome sequencing to identify somatic mutations in 24 patients with newly diagnosed chronic phase CML who were registered in the JALSG CML212 study. We identified 191 somatic mutations other than the BCR-ABL1 fusion gene (median 8, range 1–17). Age, hemoglobin concentration and white blood cell counts were correlated with the number of mutations. Patients with mutations ⩾6 showed higher rate of achieving major molecular response than those<6 (P=0.0381). Mutations in epigenetic regulator, ASXL1, TET2, TET3, KDM1A and MSH6 were found in 25% of patients. TET2 or TET3, AKT1 and RUNX1 were mutated in one patient each. ASXL1 was mutated within exon 12 in three cases. Mutated genes were significantly enriched with cell signaling and cell division pathways. Furthermore, DNA copy number analysis showed that 2 of 24 patients had uniparental disomy of chromosome 1p or 3q, which disappeared major molecular response was achieved. These mutations may play significant roles in CML pathogenesis in addition to the strong driver mutation BCR-ABL1.
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Affiliation(s)
- E Togasaki
- Department of Hematology, Chiba University Hospital, Chiba, Japan
| | - J Takeda
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Yoshida
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Shiozawa
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - M Takeuchi
- Department of Hematology, Chiba University Hospital, Chiba, Japan
| | - M Oshima
- Department of Cellular and Molecular Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - A Saraya
- Department of Cellular and Molecular Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - A Iwama
- Department of Cellular and Molecular Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - K Yokote
- Department of Clinical Cell Biology and Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - E Sakaida
- Department of Hematology, Chiba University Hospital, Chiba, Japan
| | - C Hirase
- Department of Hematology and Rheumatology, Faculty of Medicine, Kinki University, Osaka, Japan
| | - A Takeshita
- Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - K Imai
- Department of Hematology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - H Okumura
- Department of Internal Medicine, Toyama Prefectural Central Hospital, Toyama, Japan
| | - Y Morishita
- Department of Hematology and Oncology, JA Aichi Konan Kosei Hospital, Konan, Japan
| | - N Usui
- Division of Clinical Oncology and Hematology, Department of Internal Medicine, The Jikei University Daisan Hospital, Tokyo, Japan
| | - N Takahashi
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - S Fujisawa
- Department of Hematology, Yokohama City University Medical Center, Yokohama, Japan
| | - Y Shiraishi
- Laboratory of DNA Information Analysis, Human Genome Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - K Chiba
- Laboratory of DNA Information Analysis, Human Genome Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - H Tanaka
- Laboratory of DNA Information Analysis, Human Genome Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - H Kiyoi
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - K Ohnishi
- Japanese Red Cross Aichi Blood Center, Seto, Japan
| | - S Ohtake
- Department of Clinical Laboratory Science, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
| | - N Asou
- Department of Hemato-Oncology, Comprehensive Cancer Center, International Medical Center, Saitama Medical University, Saitama, Japan
| | - Y Kobayashi
- Division of Hematology, National Cancer Center Hospital, Tokyo, Japan
| | - Y Miyazaki
- Department of Hematology and Molecular Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - S Miyano
- Laboratory of DNA Information Analysis, Human Genome Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan.,Laboratory of Sequence Analysis, Human Genome Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - S Ogawa
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - I Matsumura
- Department of Cellular and Molecular Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - C Nakaseko
- Department of Hematology, Chiba University Hospital, Chiba, Japan
| | - T Naoe
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan.,National Hospital Organization Nagoya Medical Center, Nagoya, Japan
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Shoji M, Kobayashi K, Takemoto M, Sato Y, Yokote K. Urinary podocalyxin levels were associated with urinary albumin levels among patients with diabetes. Biomarkers 2015; 21:164-7. [PMID: 26635084 DOI: 10.3109/1354750x.2015.1118551] [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] [Indexed: 11/13/2022]
Abstract
Diabetic nephropathy has dramatically increased worldwide. In this study, we measured urinary podocalyxin in 240 patients with diabetes. The relationship between urinary podocalyxin and clinical parameters and the effects of dipeptidyl peptidase-4 inhibitors (DPP4i) and alpha-glucosidase inhibitor (a-GI) on urinary podocalyxin levels were examined. Urinary podocalyxin levels were significantly higher in patients with microalbuminuria than in those with normoalbuminuria. Urinary podocalyxin levels were also significantly related to albumin-to-creatinine ratio. Neither DPP4i nor α-GI ameliorated the increase in urinary podocalyxin levels. Our results indicated that urinary podocalyxin will be not only an early marker but also a treatment target for DN.
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Affiliation(s)
- M Shoji
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
| | - K Kobayashi
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
| | - M Takemoto
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
| | - Y Sato
- c Clinical Research Center, Chiba University Hospital , Chiba , Japan
| | - K Yokote
- a Department of Clinical Cell Biology and Medicine , Chiba University Graduate School of Medicine , Chiba , Japan .,b Department of Medicine , Division of Diabetes, Metabolism and Endocrinology, Chiba University Hospital , Chiba , Japan , and
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Tachibana K, Sakurai K, Yokoh H, Ishibashi T, Ishikawa K, Shirasawa T, Yokote K. Mutation in insulin receptor attenuates oxidative stress and apoptosis in pancreatic beta-cells induced by nutrition excess: reduced insulin signaling and ROS. Horm Metab Res 2015; 47:176-83. [PMID: 25295420 DOI: 10.1055/s-0034-1389990] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Type 2 diabetes results from the failure of beta-cells to adequately compensate for insulin resistance. Although the reduction of beta-cell mass is because of increased cell death and/or inadequate replication or neogenesis, the mechanism underlying beta-cell mass reduction is not fully understood. Here, we clarify the role of insulin signaling pathway in the beta-cell apoptosis using insulin resistant model mice. Wild-type mice and those carrying a mutation in the insulin receptor (mIR) were fed either regular chow or a high-fat diet for 6 weeks and subsequently investigated for beta-cell apoptosis, endoplasmic reticulum stress, and oxidative stress. Insulin tolerance tests revealed that mIR mice fed a high-fat diet (mIRHF) had higher insulin resistance. Beta-cell apoptosis was increased 2-fold in the wild-type mice fed a high-fat diet (wHF) compared with control mice, whereas beta-cell apoptosis in mIRHF mice did not increase compared with that in mIR mice. The expression of endoplasmic reticulum stress markers in isolated islets did not differ between the groups. Staining of 8-hydroxy-2'-deoxyguanosine and 4-hydroxy-2-nonenal in islets of wHF mice significantly increased, but the staining in mIRHF mice was not different from that in control group. Gene expression of the antioxidant enzyme MnSOD was significantly higher in mIRHF mice than those in the other 3 groups. A mutation in the insulin receptor attenuated the oxidative stress and apoptosis in beta-cells even though high caloric nutrient was loaded. Our results suggest that reduced insulin signaling protects beta-cells thorough decline of oxidative stress.
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Affiliation(s)
- K Tachibana
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
| | - K Sakurai
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
| | - H Yokoh
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
| | - T Ishibashi
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
| | - K Ishikawa
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
| | - T Shirasawa
- Molecular Gerontology, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - K Yokote
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
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Kobayashi K, Yokoh H, Sato Y, Takemoto M, Uchida D, Kanatsuka A, Kuribayashi N, Terano T, Hashimoto N, Sakurai K, Hanaoka H, Ishikawa K, Onishi S, Yokote K. Efficacy and safety of the dipeptidyl peptidase-4 inhibitor sitagliptin compared with α-glucosidase inhibitor in Japanese patients with type 2 diabetes inadequately controlled on sulfonylurea alone (SUCCESS-2): a multicenter, randomized, open-label, non-inferiority trial. Diabetes Obes Metab 2014; 16:761-5. [PMID: 24447683 DOI: 10.1111/dom.12264] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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] [Received: 10/24/2013] [Revised: 11/26/2013] [Accepted: 01/14/2014] [Indexed: 12/01/2022]
Abstract
We assessed the efficacy and safety of sitagliptin compared with α-glucosidase inhibitor (αGI) in 120 of Japanese patients with type 2 diabetes mellitus (T2DM) inadequately controlled on stable ≤2 mg/day glimepiride alone [mean hemoglobin A1c (HbA1c) 7.7%] by the randomized, active-controlled, non-inferiority trial. Patients were randomly assigned to receive additional sitagliptin or αGI for 24 weeks. The primary endpoint was change in HbA1c from baseline to week 12. After 12 weeks, sitagliptin reduced HbA1c by -0.44% (p < 0.001) relative to αGI. At 24 weeks, the reduction was almost identical between the groups (-0.091%, p = 0.47). Gastrointestinal disorders were more common with αGI than with sitagliptin, but only minor hypoglycaemia occurred in both groups at similar frequency. These data suggested that sitagliptin was not inferior to αGI for reduction of HbA1c in Japanese T2DM patients receiving glimepiride alone, and well tolerated with minimum risk of gastrointestinal symptoms and hypoglycaemia.
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Affiliation(s)
- K Kobayashi
- Department of Clinical Cell Biology and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan; Department of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, Chiba, Japan; Department of Regional Disaster Medicine, Chiba University Graduate School of Medicine, Chiba, Japan
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Kawaguchi T, Takeuchi M, Kawajiri C, Abe D, Nagao Y, Yamazaki A, Sugita Y, Tsukamoto S, Sakai S, Takeda Y, Ohwada C, Sakaida E, Shimizu N, Yokote K, Iseki T, Nakaseko C. Severe hyponatremia caused by syndrome of inappropriate secretion of antidiuretic hormone developed as initial manifestation of human herpesvirus-6-associated acute limbic encephalitis after unrelated bone marrow transplantation. Transpl Infect Dis 2012; 15:E54-7. [DOI: 10.1111/tid.12029] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 07/19/2012] [Accepted: 07/31/2012] [Indexed: 11/27/2022]
Affiliation(s)
- T. Kawaguchi
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - M. Takeuchi
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - C. Kawajiri
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - D. Abe
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - Y. Nagao
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - A. Yamazaki
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - Y. Sugita
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - S. Tsukamoto
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | | | - Y. Takeda
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - C. Ohwada
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | - E. Sakaida
- Department of Hematology; Chiba University Hospital; Chiba; Japan
| | | | - K. Yokote
- Department of Clinical Cell Biology and Medicine; Chiba University Graduate School of Medicine; Chiba; Japan
| | | | - C. Nakaseko
- Department of Hematology; Chiba University Hospital; Chiba; Japan
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Shimizu N, Sakaida E, Ohwada C, Takeuchi M, Kawaguchi T, Tsukamoto S, Sakai S, Takeda Y, Sugita Y, Yokote K, Iseki T, Isose S, Kanai K, Misawa S, Kuwabara S, Nakaseko C. Mobilization of PBSCs in poor mobilizers with POEMS syndrome using G-CSF with plerixafor. Bone Marrow Transplant 2012; 47:1587-8. [DOI: 10.1038/bmt.2012.80] [Citation(s) in RCA: 10] [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: 11/10/2022]
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12
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Isose S, Misawa S, Sakurai K, Kanai K, Shibuya K, Sekiguchi Y, Nasu S, Noto Y, Fujimaki Y, Yokote K, Kuwabara S. P30-25 Mexiletine suppresses nodal persistent sodium currents in sensory axons of patients with neuropathic pain. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)61165-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Shimoyama T, Hiraoka S, Takemoto M, Saito Y, Koseki H, Yokote K. Abstract: P246 CCN3 INHIBITS NEOINTIMAL HYPERPLASIA THROUGH MODULATION OF SMOOTH MUSCLE CELL GROWTH AND MIGRATION. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)70541-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Yokote K, Fujimoto M, Kawamura H, Maezawa Y, Tokuyama T, Sonezaki K, Mori S, Saito Y. 3P-0640 Examination of smooth muscle cell origin in human intimal hyperplasia: A study on bone marrow-transplanted patients. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90860-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Kobayashi K, Yokote K, Maezawa Y, Kawamura H, Fujimoto M, Asaumi S, Mori S, Saito Y. 1P-0205 Functional analysis about the role of Smad3-dependent transforming growth factor-β signaling in neointimal hyperplasia. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90276-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Mori S, Murano S, Yokote K, Takemoto M, Asaumi S, Take A, Saito Y. Enhanced intra-abdominal visceral fat accumulation in patients with Werner's syndrome. Int J Obes (Lond) 2001; 25:292-5. [PMID: 11410834 DOI: 10.1038/sj.ijo.0801529] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2000] [Revised: 08/14/2000] [Accepted: 09/20/2000] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Studies were made on the abnormality of glucose and lipid metabolism and its cause in four patients with Werner's syndrome to infer the reason for accelerated atherogenesis in this syndrome. RESULTS Of these four patients, hypercholesterolemia was found in three, hypertriglyceridemia in four, hypoalphalipoproteinemia in two and hypertension in two. All the patients had insulin-resistant diabetes mellitus and three of them had apparent hyperinsulinemia. Abdominal computed tomography revealed that all of them had visceral fat obesity, namely augumented intra-abdominal adipose tissue. CONCLUSION The clinical features of these patients resemble those recently designated as insulin resistant syndrome (syndrome X) or visceral fat syndrome. The metabolic abnormality may be one of important factors in the accelerated atherogenesis in this syndrome.
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Affiliation(s)
- S Mori
- Second Department of Internal Medicine, School of Medicine, Chiba University, Inohana, Chiba, Japan.
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17
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Mochizuki A, Kurihara Y, Yokote K, Nakajima Y, Osada H. Discrimination of solitary pulmonary nodules based on vascular supply patterns with First-Pass Dynamic CT. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80824-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Kobayashi J, Murano S, Yokote K, Mori S, Matsunaga A, Sasaki J, Takahashi K, Bujo H, Saito Y. Marked decrease in plasma apolipoprotein A-I and HDL-C in a case with Werner syndrome. Atherosclerosis 2000. [DOI: 10.1016/s0021-9150(00)81002-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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19
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Kurisu S, Yokote K, Taira Y, Mieda T, Yamamura T, Osada H, Takagi M, Uchikoshi T. [A case of pulmonary actinomycosis radiologically mimicking a lung cancer]. Kyobu Geka 2000; 53:511-3. [PMID: 10846369] [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: 02/16/2023]
Abstract
A 59-year-old male clerk consulted in general practitioner due to cough and hemoptysis. A mass shadow was pointed out in the left upper lung field on a chest radiograph. Patient was referred to our hospital for further treatment. Any definitive daiagnosis could not be made after examinations including sputum culture, cytology and TBLB. Because a lung cancer was strongly suspected, an exploratory thoracotomy was performed. Actinomyces was detected by pathological study of excised specimen, with no evidence of cancer. ABPC was administered for two months postoperatively. The patient is doing well without recurrence of actinomycosis 2.5 years after the surgery. Pulmonary actinomycosis presenting a mass shadow on a radiograph may mimick a pulmonary tumor, especially a lung cancer. Pulmonary actinomycosis should be considered in a differential diagnosis of pulmonary lesion thought to be malignant.
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Affiliation(s)
- S Kurisu
- Department of Surgery, St. Marianna University School of Medicine, Touyoko Hospital, Kawasaki, Japan
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20
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Takemoto M, Yokote K, Yamazaki M, Ridall AL, Butler WT, Matsumoto T, Tamura K, Saito Y, Mori S. Enhanced expression of osteopontin by high glucose. Involvement of osteopontin in diabetic macroangiopathy. Ann N Y Acad Sci 2000; 902:357-63. [PMID: 10865863 DOI: 10.1111/j.1749-6632.2000.tb06338.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Atherosclerotic vascular disease is a major complication of diabetic patients. Osteopontin has recently been implicated in the development of atherosclerosis. In the present study, we have investigated the effects of high glucose on expression of osteopontin in cultured rat aortic smooth muscle cells. High concentrations of glucose increased osteopontin secretion from the cells, and the increased secretion was completely inhibited by an inhibitor of protein kinase C, GF109203X. Northern blot analysis confirmed the enhanced effect of glucose on expression of osteopontin mRNA. Promoter activity of osteopontin, measured using the osteopontin promoter/luciferase expression vector system, was increased by high glucose, and the enhanced effect was completely inhibited by GF109203X. Glucosamine also increased the promoter activity of osteopontin. Azaserine, an inhibitor of glutamine:fructose-6-phosphate amidotransferase, the key enzyme of the hexosamine pathway, profoundly inhibited high glucose-mediated increase in the promoter activity. Taken together, these data indicate that high glucose enhances the expression of osteopontin at the transcriptional level possibly through the activation of protein kinase C as well as the hexosamine pathway. Our results suggest that osteopontin could play a role in the development of diabetic vascular complications.
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MESH Headings
- Animals
- Aorta
- Arteriosclerosis/physiopathology
- Cell Adhesion
- Cells, Cultured
- Diabetic Angiopathies/physiopathology
- Enzyme Activation/drug effects
- Enzyme Inhibitors/pharmacology
- Gene Expression Regulation/drug effects
- Glucose/pharmacology
- Indoles/pharmacology
- Maleimides/pharmacology
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Osteopontin
- Promoter Regions, Genetic
- Protein Kinase C/metabolism
- RNA, Messenger/genetics
- Rats
- Sialoglycoproteins/genetics
- Transcription, Genetic
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Affiliation(s)
- M Takemoto
- Second Department of Internal Medicine, School of Medicine, Chiba University, Japan.
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21
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Matsumoto T, Yokote K, Take A, Takemoto M, Asaumi S, Hashimoto Y, Matsuda M, Saito Y, Mori S. Differential interaction of CrkII adaptor protein with platelet-derived growth factor alpha- and beta-receptors is determined by its internal tyrosine phosphorylation. Biochem Biophys Res Commun 2000; 270:28-33. [PMID: 10733900 DOI: 10.1006/bbrc.2000.2374] [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
CrkII is an intracellular adaptor protein involved in signal transduction by various growth factors. Activation of PDGF alpha-receptor resulted in its association with CrkII in vivo. In contrast, binding of CrkII to the PDGF beta-receptor was negligible, despite its becoming prominently phosphorylated. Bacterially expressed GST-CrkII SH2 domain specifically bound to Tyr-762 and Tyr-771 in the activated PDGF alpha- and beta- receptors, respectively. GST fusion protein of full-length CrkII also bound to the activated PDGF beta-receptor. However, tyrosine phosphorylation of GST-CrkII diminished its binding to the beta-receptor. CrkI, a truncated version of CrkII lacking the phosphorylatable tyrosine residue, could bind to both PDGF alpha- and beta-receptors in vivo. In conclusion, tyrosine phosphorylation of CrkII negatively affects its binding to the PDGF receptors. The differential binding of CrkII to the PDGF alpha- and beta- receptors may be a rationale for functional diversity between the two receptors.
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Affiliation(s)
- T Matsumoto
- Second Department of Internal Medicine, Chiba University School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, 260-0856, Japan
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22
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Tamura K, Kanzaki T, Tashiro J, Yokote K, Mori S, Ueda S, Saito Y, Morisaki N. Increased atherogenesis in Otsuka Long-Evans Tokushima fatty rats before the onset of diabetes mellitus: association with overexpression of PDGF beta-receptors in aortic smooth muscle cells. Atherosclerosis 2000; 149:351-8. [PMID: 10729385 DOI: 10.1016/s0021-9150(99)00349-4] [Citation(s) in RCA: 20] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The mechanism of diabetic macroangiopathy was studied from the view point of phenotypic change of arterial smooth muscle cells (SMC). Otsuka Long-Evans Tokushima fatty (OLETF) rat, an animal model of non-insulin dependent diabetes mellitus (NIDDM), develops spontaneous persistent hyperglycemia after the age of 18 weeks. Medial SMC in OLETF rats expressed more platelet-derived growth factor (PDGF) beta-receptor and fibronectin at the protein level than those from control, Long-Evans Tokushima Otsuka (LETO) rats, not only after but also before the onset of diabetes mellitus. Cultured SMC from OLETF rats more strongly responded specifically to the mitogenic stimuli of PDGF-AB and PDGF-BB and also expressed PDGF beta-receptor more intensely compared with those from LETO rats. PDGF is known to be the main contributor to the intimal thickening induced by balloon catheter injury, which is one of several forms of arterial injuries. Intimal thickening of carotid arteries in OLETF rats after balloon catheter injury increased compared with that in LETO rats before the onset of diabetes mellitus. In in vitro culture system, fibronectin synthesis was stimulated by transforming growth factor-beta1(TGF-beta1) in SMC from OLETF rats, but not in those from LETO rats, suggesting that SMC from OLETF rats respond to TGF-beta1. These results indicate that overexpression of PDGF beta-receptor and fibronectin in medial SMC plays an important role in the accelerated intimal thickening before the onset of diabetes mellitus in OLETF rats.
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MESH Headings
- Animals
- Aorta, Thoracic/cytology
- Aorta, Thoracic/pathology
- Becaplermin
- Cell Division
- Cells, Cultured
- DNA/analysis
- DNA/biosynthesis
- Diabetes Mellitus, Type 2/metabolism
- Disease Models, Animal
- Fibronectins/analysis
- Fibronectins/metabolism
- Male
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Platelet-Derived Growth Factor/analysis
- Platelet-Derived Growth Factor/pharmacology
- Proto-Oncogene Proteins c-sis
- Rats
- Rats, Inbred OLETF
- Receptor, Platelet-Derived Growth Factor beta/analysis
- Receptor, Platelet-Derived Growth Factor beta/metabolism
- Reference Values
- Sensitivity and Specificity
- Tunica Intima/injuries
- Tunica Intima/pathology
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Affiliation(s)
- K Tamura
- Second Department of Internal Medicine, School of Medicine, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba, Japan
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23
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Kobayashi J, Murano S, Yokote K, Mori S, Matsunaga A, Sasaki J, Takahashi K, Bujo H, Saito Y. Marked decrease in plasma apolipoprotein A-I and high density lipoprotein-cholesterol in a case with Werner syndrome. Clin Chim Acta 2000; 293:63-73. [PMID: 10699423 DOI: 10.1016/s0009-8981(99)00219-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The patient was a 39-year-old Japanese male with a body height of 160 cm and weight of 48 kg who was diagnosed as Werner syndrome of homozygote for mutation 4. His plasma total cholesterol (TC), triglycerides (TGs), high density lipoprotein-cholesterol (HDL-C) and apolipoprotein A-I (apo A-I) levels were 7.2, 2.1, 1 mmol/l and 128 mg/dl, respectively. During the clinical course of treatment of this patient, his plasma levels of HDL-C and apo A-I declined drastically to levels of as low as 0.2 mmol/l and 10 mg/dl, respectively, with concurrent reciprocal increase in plasma TG levels. Plasma HDL-C, apo A-I and TG levels gradually returned to original values. Lipoprotein lipase activity and mass in post-heparin plasma were markedly low when the apo A-I and HDL-C levels decreased to 10 mg/dl and 0.21 mmol/l, respectively, and these values improved when the apo A-I and HDL-C levels returned to more normal values of 106 mg/dl and 0.94 mmol/l, respectively. The result of direct sequence of the exon 3 and 4, and the promoter region of the apo A-I gene of the patient revealed no single nucleotide changes. These results suggest that in the present patient, impaired hydrolysis of TGs in TG-rich lipoproteins, is due at least in part to a decreased LPL enzyme level, reduced the formation of nascent HDL, resulting in unusually low plasma levels of HDL-C and apo A-I.
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Affiliation(s)
- J Kobayashi
- Health Sciences Center Chiba University, Chiba, Japan
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24
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Takemoto M, Yokote K, Nishimura M, Shigematsu T, Hasegawa T, Kon S, Uede T, Matsumoto T, Saito Y, Mori S. Enhanced expression of osteopontin in human diabetic artery and analysis of its functional role in accelerated atherogenesis. Arterioscler Thromb Vasc Biol 2000; 20:624-8. [PMID: 10712383 DOI: 10.1161/01.atv.20.3.624] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.3] [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: 11/16/2022]
Abstract
We have previously reported that high glucose stimulates osteopontin (OPN) expression through protein kinase C-dependent pathways as well as hexosamine pathways in cultured rat aortic smooth muscle cells. The finding prompted us to study in vivo expression of OPN in diabetes mellitus. In the present study, we found by immunohistochemistry that medial layers of the carotid arteries of streptozotocin-induced diabetic rats and the forearm arteries of diabetic patients stained positively for OPN antibodies, whereas the staining from arteries of control rats and nondiabetic patients was negative. We also found that OPN stimulated the migration and enhanced platelet-derived growth factor (PDGF)-mediated DNA synthesis of cultured rat aortic smooth muscle cells. OPN and PDGF synergistically activated focal adhesion kinase as well as extracellular signal-regulated kinase; this finding seems to explain the OPN-induced enhancement of PDGF-mediated DNA synthesis. Taken together, our present results raise a possibility that OPN plays a role in the development of diabetic vascular complications.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Animals
- Aorta/cytology
- Aorta/enzymology
- Arteriosclerosis/etiology
- Arteriosclerosis/metabolism
- Becaplermin
- Carotid Arteries/metabolism
- Cell Movement/drug effects
- Cell Movement/physiology
- Cells, Cultured
- DNA/biosynthesis
- DNA-Binding Proteins
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Type 1/metabolism
- Diabetes Mellitus, Type 2/metabolism
- Diabetic Angiopathies/metabolism
- Enzyme Activation/drug effects
- Female
- Focal Adhesion Kinase 1
- Focal Adhesion Protein-Tyrosine Kinases
- Forearm/blood supply
- Humans
- Male
- Microcirculation/physiology
- Middle Aged
- Mitogen-Activated Protein Kinases/metabolism
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/enzymology
- Osteopontin
- Platelet-Derived Growth Factor/pharmacology
- Protein-Tyrosine Kinases/metabolism
- Proto-Oncogene Proteins/metabolism
- Proto-Oncogene Proteins c-sis
- Rats
- Rats, Wistar
- Sialoglycoproteins/biosynthesis
- Sialoglycoproteins/pharmacology
- Transcription Factors
- ets-Domain Protein Elk-1
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Affiliation(s)
- M Takemoto
- Second Department of Internal Medicine, School of Medicine, Chiba University, Chiba, Japan.
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25
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Takemoto M, Tada K, Nakatsuka K, Moriyama Y, Kazui H, Yokote K, Matsumoto T, Saito Y, Mori S. [Effects of aging and hyperlipidemia on plasma osteopontin level]. Nihon Ronen Igakkai Zasshi 1999; 36:799-802. [PMID: 10655737 DOI: 10.3143/geriatrics.36.799] [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: 11/11/2022]
Abstract
In order to elucidate a possible mechanism for accelerated atherogenesis as well as enhanced vascular calcification observed during the normal aging process, we measured plasma osteopontin (OPN) levels and examined their relation to aging and certain disease parameters. In all cases examined, no significant relation was found between the plasma OPN level and age, body mass index, blood pressure, plasma levels of glucose and insulin, serum levels of creatinine, triglyceride, and high density lipoprotein cholesterol. On the other hand, a significant negative correlation was found between the plasma OPN level and serum total cholesterol concentration (n = 78, r = -0.355, p = 0.0014). The serum level of low density lipoprotein (LDL) cholesterol, calculated by the formula of Friedewald, also showed a significant negative correlation to the plasma OPN level (n = 78, r = -0.301, p = 0.0075). In cases without diabetes mellitus and hypertension, a significant positive correlation was found between the plasma OPN level and age (n = 22, r = 0.445, p = 0.0378). It is postulated that OPN plays a negative regulatory role in the development of vascular calcification. Therefore, the observed negative relationship between the plasma OPN level and the serum levels of total cholesterol and LDL cholesterol, suggests a possibility that hypercholesterolemia facilitates vascular calcification by suppressing OPN synthesis. On the other hand, in non-diabetic and normotensive cases, the positive relationship between the plasma OPN level and age may reflect a defense mechanism against age-related increase of vascular calcification.
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Affiliation(s)
- M Takemoto
- Second Department of Internal Medicine, Chiba University School of Medicine
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26
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Kawamura H, Mori S, Murano S, Yokote K, Tamura K, Saito Y. [Werner's syndrome associated with progressive subcortical vascular encephalopathy of the Binswanger type]. Nihon Ronen Igakkai Zasshi 1999; 36:648-51. [PMID: 10572450 DOI: 10.3143/geriatrics.36.648] [Citation(s) in RCA: 5] [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: 11/11/2022]
Abstract
A 56-year-old woman with Werner's syndrome was admitted to our hospital because of intractable foot ulcer and malnutrition. She presented dementia consisting of childish behaviour, loss of intelligence, and severe amnesia. Brain CT revealed diffuse periventricular low density areas, and brain MRI also disclosed periventricular high intensity areas under T2-intensified conditions. These findings gave a diagnosis of progressive subcortical vascular encephalopathy of the Binswanger type, which seemed to be the cause of her dementia. She finally died of heart failure due to acute myocardial infarction. Mild to moderate demyelinization was found in the subcortical area of the autopsied cerebrum, confirming the clinical diagnosis. Generalized atherosclerosis characteristic of Werner's syndrome may have predisposed this patient to Binswanger's encephalopathy.
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Affiliation(s)
- H Kawamura
- Department of Internal Medicine, Chiba University School of Medicine
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27
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Takemoto M, Yokote K, Yamazaki M, Ridall AL, Butler WT, Matsumoto T, Tamura K, Saito Y, Mori S. Enhanced expression of osteopontin by high glucose in cultured rat aortic smooth muscle cells. Biochem Biophys Res Commun 1999; 258:722-6. [PMID: 10329452 DOI: 10.1006/bbrc.1999.0701] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [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: 11/22/2022]
Abstract
Atherosclerotic vascular disease is a major complication of diabetic patients, and osteopontin has recently been implicated in the development of atherosclerosis. In the present study, we have investigated the effects of high glucose on expression of osteopontin in cultured rat aortic smooth muscle cells. High concentrations of glucose increased osteopontin secretion from the cells, and the increased secretion was completely inhibited by an inhibitor of protein kinase C, GF109203X. Northern blot analysis confirmed the enhanced effect of glucose on expression of osteopontin mRNA. Promoter activity of osteopontin, measured using the osteopontin promoter/luciferase expression vector system, was increased by high glucose, and the enhanced effect was completely inhibited by GF109203X. Glucosamine also increased the promoter activity of osteopontin, and azaserine, an inhibitor of glutamine:fructose-6-phosphate amidotransferase (the key enzyme of the hexosamine pathway), profoundly inhibited high glucose-mediated increase in the promoter activity. Taken together, these data indicate that high glucose enhances the expression of osteopontin at the transcriptional level possibly through the activation of protein kinase C as well as the hexosamine pathway. Our results suggest that osteopontin could play a role in the development of diabetic vascular complications.
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MESH Headings
- Animals
- Aorta/cytology
- Aorta/metabolism
- Cells, Cultured
- Enzyme Activation
- Enzyme Inhibitors/pharmacology
- Glucose/metabolism
- Hexosamines/metabolism
- Indoles/pharmacology
- Male
- Maleimides/pharmacology
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/metabolism
- Osteopontin
- Promoter Regions, Genetic
- Protein Kinase C/antagonists & inhibitors
- Protein Kinase C/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Sialoglycoproteins/genetics
- Transcription, Genetic
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Affiliation(s)
- M Takemoto
- School of Medicine, Chiba University, 1-8-1 Inohana, Chiba, Chuou-ku, 260-0856, Japan.
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28
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Matsumoto T, Yokote K, Tamura K, Takemoto M, Ueno H, Saito Y, Mori S. Platelet-derived growth factor activates p38 mitogen-activated protein kinase through a Ras-dependent pathway that is important for actin reorganization and cell migration. J Biol Chem 1999; 274:13954-60. [PMID: 10318806 DOI: 10.1074/jbc.274.20.13954] [Citation(s) in RCA: 145] [Impact Index Per Article: 5.8] [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: 11/06/2022] Open
Abstract
Members of the mitogen activated protein (MAP) kinase family, extracellular signal-regulated kinase, stress-activated protein kinase-1/c-Jun NH2-terminal kinase, and p38, are central elements that transduce the signal generated by growth factors, cytokines, and stressing agents. It is well known that the platelet-derived growth factor (PDGF) activates extracellular signal-regulated kinase, which leads to cellular mitogenic response. On the other hand, the role of the other MAP kinases in mediating the cellular function of PDGF remains unclear. In the present study, we have investigated the functional role of the other MAP kinases in PDGF-mediated cellular responses. We show that ligand stimulation of PDGF receptors leads to the activation of p38 but not stress-activated protein kinase-1/c-Jun NH2-terminal kinase. Experiments using a specific inhibitor of p38, SB203580, show that the activation of p38 is required for PDGF-induced cell motility responses such as cell migration and actin reorganization but not required for PDGF-stimulated DNA synthesis. Analyses of tyrosine residue-mutated PDGF receptors show that Src homology 2 domain-containing proteins including Src family kinases, phosphatidylinositol 3-kinase, the GTPase-activating protein of Ras, the Src homology 2 domain-containing phosphatase SHP-2, phospholipase C-gamma, and Crk do not play a major role in mediating the PDGF-induced activation of p38. Finally, the expression of dominant-negative Ras but not dominant-negative Rac inhibited p38 activation by PDGF, suggesting that Ras is a potent mediator in the p38 activation pathway downstream of PDGF receptors. Taken together, our present study proposes the existence of a Ras-dependent pathway for the activation of p38, which is important for cell motility responses elicited by PDGF stimulation.
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Affiliation(s)
- T Matsumoto
- Second Department of Internal Medicine, Chiba University School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba 260-0856, Japan.
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29
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Tamura K, Yokote K, Takemoto M, Matsumoto T, Ishisaki A, Funa K, Saito Y, Mori S. Fibronectin stimulates transcription of the platelet-derived growth factor beta-receptor in cultured rat aortic smooth muscle cells. Biochem Biophys Res Commun 1998; 251:677-80. [PMID: 9790968 DOI: 10.1006/bbrc.1998.9529] [Citation(s) in RCA: 9] [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: 11/22/2022]
Abstract
Fibronectin seems to play an important role in promoting the characteristic changes of vascular smooth muscle cells in diabetes mellitus including overexpression of the platelet-derived growth factor beta-receptor. To determine the regulatory mechanism of the beta-receptor by fibronectin, we have analyzed the effect of fibronectin on the expression of the beta-receptor in cultured rat aortic smooth muscle cells using the beta-receptor promoter/luciferase expression vector system. Fibronectin was found to stimulate the expression of the beta-receptor at the transcriptional level. Both a MEK1 inhibitor PD98059 and a tyrosine kinase inhibitor herbimycin A significantly inhibited the fibronectin-stimulated receptor transcription. Herbimycin A also completely inhibited the fibronectin-stimulated increase in tyrosine phosphorylation of focal adhesion kinase. These data suggest the involvement of the integrin-mediated mitogen-activated protein kinase pathway downstream of fibronectin stimulation in the activation process of the beta-receptor promoter.
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MESH Headings
- Animals
- Aorta/cytology
- Aorta/drug effects
- Benzoquinones
- Calcium-Calmodulin-Dependent Protein Kinases/metabolism
- Dose-Response Relationship, Drug
- Fibronectins/pharmacology
- Flavonoids/pharmacology
- Genes, Reporter
- Integrins/metabolism
- Lactams, Macrocyclic
- Luciferases/biosynthesis
- Luciferases/genetics
- Muscle, Smooth, Vascular/drug effects
- Promoter Regions, Genetic
- Protein Kinase Inhibitors
- Quinones/pharmacology
- Rats
- Receptor, Platelet-Derived Growth Factor beta
- Receptors, Platelet-Derived Growth Factor/biosynthesis
- Receptors, Platelet-Derived Growth Factor/genetics
- Recombinant Fusion Proteins/biosynthesis
- Rifabutin/analogs & derivatives
- Signal Transduction
- Transcription, Genetic
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Affiliation(s)
- K Tamura
- Second Department of Internal Medicine, School of Medicine, Chiba University, 1-8-1 Inohana, Chiba, Chuou-ku, 260-0856, Japan
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30
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Landgren E, Klint P, Yokote K, Claesson-Welsh L. Fibroblast growth factor receptor-1 mediates chemotaxis independently of direct SH2-domain protein binding. Oncogene 1998; 17:283-91. [PMID: 9690510 DOI: 10.1038/sj.onc.1201936] [Citation(s) in RCA: 41] [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: 02/08/2023]
Abstract
Endothelial cells expressing fibroblast growth factor receptor-1 (FGFR-1) migrate and proliferate in response to treatment with FGF. We analysed ligand-induced migration and proliferation of porcine aortic endothelial cells expressing wild-type FGFR-1, point-mutated Y766F FGFR-1, unable to activate phospholipase C-gamma1 (PLC-gamma1), or carboxyl-terminally truncated FGFR-1, lacking either 48 (from amino acid 774 in the FGFR-1 sequence) or 63 (from amino acid 759) amino acid residues of the C-terminal tail. The truncated CT63 FGFR-1 mutant failed to mediate chemotaxis, but was in response to ligand stimulation capable of mediating proliferation of the cells, stimulation of MAP kinase activity and tyrosine phosphorylation of FRS2, an FGFR-1 specific signaling molecule. The defect in migration-capacity of CT63 was not due to loss of Y766, and thereby PLC-gamma1 activation, since cells expressing the mutant Y766F FGFR-1 migrated as efficiently as the wild-type receptor cells. Induction of phospholipase A2 (PLA2) activity by the activated FGFR-1 was dependent on the presence of Y766, and was therefore also not critical for the chemotactic response. Although the FGFR-1 only very inefficiently mediates activation of phosphatidylinositol 3' kinase (PI 3-kinase), the PI 3-kinase inhibitor wortmannin suppressed wild-type FGFR-1 mediated migration. We conclude that the signal transduction pathway for FGFR-1 mediated migration is independent of phosphotyrosine residues in the receptor and requires activation of a wortmannin-sensitive enzyme.
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MESH Headings
- Adaptor Proteins, Signal Transducing
- Amino Acid Sequence
- Androstadienes/pharmacology
- Animals
- Aorta
- Becaplermin
- Calcium-Calmodulin-Dependent Protein Kinases/metabolism
- Cell Division
- Cells, Cultured
- Chemotaxis/physiology
- Endothelium, Vascular/cytology
- Endothelium, Vascular/physiology
- Enzyme Activation
- Enzyme Inhibitors
- Inositol Phosphates/metabolism
- Isoenzymes/metabolism
- Membrane Proteins/metabolism
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Phospholipase C gamma
- Phospholipases A/biosynthesis
- Phospholipases A2
- Phosphoproteins/metabolism
- Platelet-Derived Growth Factor/pharmacology
- Point Mutation
- Proto-Oncogene Proteins c-sis
- Receptor Protein-Tyrosine Kinases
- Receptor, Fibroblast Growth Factor, Type 1
- Receptor, Platelet-Derived Growth Factor alpha
- Receptors, Fibroblast Growth Factor/chemistry
- Receptors, Fibroblast Growth Factor/drug effects
- Receptors, Fibroblast Growth Factor/physiology
- Receptors, Platelet-Derived Growth Factor/biosynthesis
- Receptors, Platelet-Derived Growth Factor/chemistry
- Receptors, Platelet-Derived Growth Factor/physiology
- Recombinant Fusion Proteins/biosynthesis
- Recombinant Fusion Proteins/chemistry
- Recombinant Fusion Proteins/drug effects
- Signal Transduction
- Swine
- Transfection
- Type C Phospholipases/metabolism
- Wortmannin
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Affiliation(s)
- E Landgren
- Department of Medical Biochemistry and Microbiology, Biomedical Center, Uppsala, Sweden
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31
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Tashiro J, Takahashi K, Yokote K, Takahashi M, Inadera H, Kobayashi J, Kanzaki T, Murano S, Shinomiya M, Morisaki N, Saito Y. Administration of a small amount of lard enhances intimal thickening in the balloon catheter injury model without affecting serum lipids. Scand J Clin Lab Invest 1998; 58:149-54. [PMID: 9587167 DOI: 10.1080/00365519850186733] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Effects of fatty acids on intimal thickening induced by a balloon catheter injury model were investigated by feeding rabbits a small amount of either lard [L] or fish oil [F]. Serum lipids of these groups were not different from those of basal diet-fed rabbits [controls] after 4 weeks of feeding. Serum saturated fatty acids such as 14:0, 16:0, and 18.0 were significantly greater in the L-fed rabbits compared with controls, but those of the aorta were not significantly different. Fatty acid composition of the F-fed rabbits was only different from that of the controls in that n-3 fatty acids slightly increased. The mean and maximum intimal thickening 2 weeks after ballooning, carried out 2 weeks after feeding, were significantly higher in the carotid arteries of the L-fed rabbits than in the controls. The intimal thickening of the F-fed rabbits did not significantly differ from that of the controls. These results suggest that lard promotes the formation of the smooth muscle cell dominant type of arteriosclerosis without affecting serum lipid levels.
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Affiliation(s)
- J Tashiro
- Second Department of Internal Medicine, School of Medicine, Chiba University, Saiseikai-Funabashi Hospital, Japan
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32
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Yokote K, Hellman U, Ekman S, Saito Y, Rönnstrand L, Saito Y, Heldin CH, Mori S. Identification of Tyr-762 in the platelet-derived growth factor alpha-receptor as the binding site for Crk proteins. Oncogene 1998; 16:1229-39. [PMID: 9546424 DOI: 10.1038/sj.onc.1201641] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Tyr-762 is an autophosphorylation site in the human platelet-derived growth factor (PDGF) alpha-receptor. In order to investigate whether phosphorylated Tyr-762 serves as a docking site for downstream signal transduction molecules, affinity purification using an immobilized synthetic peptide containing phosphorylated Tyr-762 and its surrounding amino acid residues was performed. Proteins in HeLa cell lysate of molecular sizes 27, 38 and 40 kDa bound to the phosphorylated, but not to the unphosphorylated peptide. Analyses of partial amino acid sequences of the purified proteins indicated that they were identical to CrkI, CrkII and CrkL respectively. The wild-type PDGF alpha-receptor, when expressed in porcine aortic endothelial cells, formed complexes with CrkII and CrkL upon ligand stimulation, which was specifically inhibited by a synthetic peptide containing phosphorylated Tyr-762. Replacement of Tyr-762 with a phenylalanine residue in the PDGF alpha-receptor abrogated ligand-induced binding of Crk proteins. Tyrosine phosphorylation of CrkII and CrkL increased by 1.8- and 1.3-fold, respectively, upon ligand stimulation of the wild-type alpha-receptor. In contrast, the Y762F mutant PDGF alpha-receptor failed to induce tyrosine phosphorylation of Crk proteins. CrkII and CrkL constitutively formed complex with the guanine nucleotide exchange factor C3G, in unstimulated as well as PDGF-stimulated cells. Moreover, the activated wild-type PDGF alpha-receptor but not the Y762F mutant receptor was found in a C3G immunoprecipitate, suggesting that a ternary complex between the activated PDGF alpha-receptor, Crk and C3G was formed. DNA synthesis stimulated by PDGF-BB as well as PDGF-induced MAP kinase activation was similar in cells expressing wild-type and mutant receptors. Interestingly, the activated PDGF beta-receptor was found not to bind Crk proteins. Instead, Tyr-771 of the beta-receptor, which is localized at an analogous position to Tyr-762 in the alpha-receptor, binds RasGAP. RasGAP is not bound to the alpha-receptor. Thus, this region in the kinase inserts of the two receptors may be important for the divergency in signaling from the two PDGF receptors.
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Affiliation(s)
- K Yokote
- Second Department of Internal Medicine, Chiba University School of Medicine, Chiba city, Japan
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33
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Hooshmand-Rad R, Yokote K, Heldin CH, Claesson-Welsh L. PDGF alpha-receptor mediated cellular responses are not dependent on Src family kinases in endothelial cells. J Cell Sci 1998; 111 ( Pt 5):607-14. [PMID: 9454734 DOI: 10.1242/jcs.111.5.607] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two novel autophosphorylation sites in the juxtamembrane region of the PDGF alpha-receptor, Tyr-572 and Tyr-574, were identified. A Y572/574F mutant PDGF (alpha)-receptor was generated and stably expressed in porcine aortic endothelial cells. In contrast to the wild-type receptor, the mutant receptor was unable to associate with or activate Src family tyrosine kinases. Tyrosine phosphorylated synthetic peptides representing the juxtamembrane sequence of the receptor dose-dependently inhibited the binding of Src family tyrosine kinases to the autophosphorylated PDGF alpha-receptor. The mutant receptor showed similar PDGF-induced kinase activity and ability to mediate mitogenicity, actin reorganization and chemotaxis as the wild-type receptor. Thus activation of Src family kinases by the PDGF alpha-receptor is not essential for PDGF-induced mitogenicity or actin reorganization.
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Affiliation(s)
- R Hooshmand-Rad
- Ludwig Institute for Cancer Research, Box 595, Biomedical Center, S-751 24 Uppsala, Sweden
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34
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Mori S, Tanaka K, Kanaki H, Nakao M, Anan T, Yokote K, Tamura K, Saito Y. Identification of an ubiquitin-ligation system for the epidermal-growth-factor receptor--herbimycin A induces in vitro ubiquitination in rabbit-reticulocyte lysate. Eur J Biochem 1997; 247:1190-6. [PMID: 9288947 DOI: 10.1111/j.1432-1033.1997.01190.x] [Citation(s) in RCA: 11] [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: 02/05/2023]
Abstract
Some receptor tyrosine kinases such as the receptors for epidermal-growth factor (EGF) and platelet-derived growth factor undergo polyubiquitination as a consequence of ligand binding. The EGF receptor is also ubiquitinated by treatment with herbimycin A, an ansamycin antibiotic widely used as a tyrosine kinase inhibitor. To investigate the mechanism of the receptor ubiquitination, we have established an assay system in which herbimycin-A-induced ubiquitination processes can be analyzed in vitro. We now show that herbimycin A treatment of the purified EGF receptor induces polyubiquitination of the receptor in rabbit-reticulocyte lysate. Both DEAE unadsorbed material (fraction I) and high salt eluate (fraction II) of the reticulocyte lysate are involved cooperatively in the ubiquitination process, where the ubiquitin-conjugating enzyme UBC4 can functionally substitute for fraction I. A ubiquitin-protein ligase-like activity, partially purified from fraction II by DEAE anion-exchange chromatography, also functions in concert with UBC4. The precise mechanism of herbimycin A-induced ubiquitination of the EGF receptor is not fully understood, however, our present findings suggest that direct interaction with herbimycin A results in some modification of the receptor which is recognized by the ubiquitin-conjugating system in rabbit-reticulocyte lysate.
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Affiliation(s)
- S Mori
- Second Department of Internal Medicine, Chiba University School of Medicine, Japan.
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35
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Hooshmand-Rad R, Claesson-Welsh L, Wennström S, Yokote K, Siegbahn A, Heldin CH. Involvement of phosphatidylinositide 3'-kinase and Rac in platelet-derived growth factor-induced actin reorganization and chemotaxis. Exp Cell Res 1997; 234:434-41. [PMID: 9260914 DOI: 10.1006/excr.1997.3636] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.6] [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: 02/05/2023]
Abstract
Previous work has suggested a role for phosphatidylinositide 3'-kinase (PI3-kinase) in platelet-derived growth factor (PDGF)-induced actin reorganization and chemotaxis. In support of this notion, we show in this report that the PI3-kinase inhibitor wortmannin inhibits chemotaxis of PDGF beta-receptor expressing porcine aortic endothelial (PAE/PDGFR-beta) cells. Treatment with wortmannin resulted in a dose-dependent decrease in chemotaxis with an IC50 value of about 15-20 nM. Higher concentrations of wortmannin also reduced basal random migration of transfected cells in the absence of PDGF. We also investigated the role of Rac in PDGF-induced actin reorganization and cell motility. Overexpression of wt Rac in PAE/PDGFR-beta cells led to an increased cell motility and edge ruffling in response to PDGF-BB, compared to control cells. In PAE/PDGFR-beta cells transfected with inducible V12Rac (a constitutively active Rac mutant), membrane ruffling occurred in the absence of PDGF stimulation and was independent of PI3-kinase activity. On the other hand, PAE/PDGFR-beta cells transfected with inducible N17Rac (a dominant negative Rac mutant) failed to show membrane ruffling in response to PDGF stimulation. Together with previous observations, these data indicate that activation of PI3-kinase is crucial for initiation of PDGF-induced cell motility responses and that Rac has a major role downstream of PI3-kinase, in this pathway.
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Affiliation(s)
- R Hooshmand-Rad
- Ludwig Institute for Cancer Research, Biomedical Center, Uppsala, Sweden
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36
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Watanabe S, Morisaki N, Tezuka M, Fukuda K, Ueda S, Koyama N, Yokote K, Kanzaki T, Yoshida S, Saito Y. Cultured retinal pericytes stimulate in vitro angiogenesis of endothelial cells through secretion of a fibroblast growth factor-like molecule. Atherosclerosis 1997; 130:101-7. [PMID: 9126653 DOI: 10.1016/s0021-9150(96)06050-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Interaction between cultured endothelial cells (EC) and pericytes (PC) was studied in vitro to clarify the mechanism of diabetic proliferative retinopathy. Conditioned medium (CM) from retinal PC strongly increased the proliferation and moderately stimulated migration of retinal EC. Moreover, CM from PC caused stimulation of angiogenesis of retinal EC and umbilical cord vein EC in vitro at the same extent as basic fibroblast growth factor (bFGF). PC also stimulated angiogenesis by EC in mixed cultures. The angiogenic, proliferative and migration activities in CM from PC were inhibited by an antibody to bFGF. These data suggest that PC play an important role in angiogenesis through secretion of an FGF-like molecule.
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Affiliation(s)
- S Watanabe
- First Department of Internal Medicine, School of Medicine, Chiba University, Japan
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37
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Yokote K, Margolis B, Heldin CH, Claesson-Welsh L. Grb7 is a downstream signaling component of platelet-derived growth factor alpha- and beta-receptors. J Biol Chem 1996; 271:30942-9. [PMID: 8940081 DOI: 10.1074/jbc.271.48.30942] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.2] [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: 02/03/2023] Open
Abstract
Ligand stimulation of the platelet-derived growth factor (PDGF) alpha- or beta-receptors leads to activation of their intrinsic tyrosine kinases and autophosphorylation of tyrosine residues. Grb7 is an SH2 and PH domain-containing molecule that is known to be overexpressed in some breast cancer tissues and cell lines. Here we show that the SH2 domain of Grb7 can directly bind to the autophosphorylated PDGF beta-receptor in vitro. Grb7 association to the PDGF beta-receptor was dramatically reduced by replacement of tyrosine residues 716 or 775 with phenylalanine residues. Synthetic phosphorylated peptides containing Tyr-716 or Tyr-775 inhibited binding of the Grb7 SH2 domain to the autophosphorylated PDGF beta-receptor in a manner similar to but distinct from the binding of the Grb2 SH2 domain. Grb7 associated with activated PDGF beta-receptors in vivo, and the association was dramatically reduced by substitution of Tyr-716 or Tyr-775 with a phenylalanine residue. Furthermore, complex formation between Shc and Grb7 was observed after ligand stimulation of PDGF alpha- or beta-receptors in cells transfected with Grb7 cDNA or in the breast cancer cell line BT-474. Thus, Grb7 is implicated in PDGF signaling pathways in certain cell types by binding to the receptor directly or indirectly via Shc.
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Affiliation(s)
- K Yokote
- Ludwig Institute for Cancer Research, Biomedical Center, S-751 24 Uppsala, Sweden.
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38
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Saito Y, Mori S, Yokote K, Kanzaki T, Saito Y, Morisaki N. Phosphatidylinositol 3-kinase activity is required for the activation process of focal adhesion kinase by platelet-derived growth factor. Biochem Biophys Res Commun 1996; 224:23-6. [PMID: 8694818 DOI: 10.1006/bbrc.1996.0978] [Citation(s) in RCA: 23] [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: 02/01/2023]
Abstract
Platelet-derived growth factor (PDGF) is one of the agents which stimulate increase in phosphotyrosine content of focal adhesion kinase (FAK) in cultured cells. In the present study we report that wortmannin, a highly specific and potent inhibitor of the catalytic subunit of mammalian phosphatidylinositol (PI) 3-kinase, completely abolishes PDGF-BB-mediated increase in tyrosine phosphorylation of FAK in human umbilical vein smooth muscle cells. Furthermore, analysis of the wild-type and mutant human PDGF beta-receptors stably expressed in porcine aortic endothelial cells also demonstrates that the Y740/751F mutant receptor, which cannot interact with PI 3-kinase due to the mutational alteration of its binding sites for PI 3-kinase, fails to increase FAK phosphorylation after PDGF-BB stimulation. These data suggest the requirement for PI 3-kinase activity in the activation process of FAK downstream of the PDGF receptor.
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Affiliation(s)
- Y Saito
- Second Department of Internal Medicine, Chiba University School of Medicine, Japan
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39
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Yokote K, Mori S, Siegbahn A, Rönnstrand L, Wernstedt C, Heldin CH, Claesson-Welsh L. Structural determinants in the platelet-derived growth factor alpha-receptor implicated in modulation of chemotaxis. J Biol Chem 1996; 271:5101-11. [PMID: 8617789 DOI: 10.1074/jbc.271.9.5101] [Citation(s) in RCA: 40] [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: 01/31/2023] Open
Abstract
Activation of the platelet-derived growth factor (PDGF) beta-receptor leads to cell growth and chemotaxis. The PDGF alpha-receptor also mediates a mitogenic signal, but fails to induce cell migration in certain cell types. To examine this difference in signal transduction, a series of point-mutated PDGF alpha-receptors were analyzed. Porcine aortic endothelial cells expressing mutant PDGF alpha-receptors, in which tyrosine residues 768, 993, or 1018 were changed to phenylalanine residues migrated toward PDGF, whereas wild-type alpha-receptors and mutant alpha-receptors changed at tyrosine residues 720, 944, or 988 failed to migrate. All mutant receptors were mitogenically active and their capacity to activate phosphatidylinositol 3'-kinase and phospholipase C-gamma was not different from that of the wild-type receptor. Tyr-768 was found to be phosphorylated in PDGF-stimulated cells; in the Y768F mutant, there was a considerable increase in phosphorylation of Ser-767. Tyr-993 was not phosphorylated, but mutation of this tyrosine residue to a phenylalanine residue resulted in increased efficiency of phosphorylation on Tyr-988. Tyr-1018 is known to be an autophosphorylation site. Phosphorylated Tyr-768 and Tyr-1018 may bind signal transduction molecules involved in negative modulation of the chemotactic signaling capacity, whereas phosphorylated Tyr-988 may mediate increased chemotaxis. Thus our data indicate that the PDGF alpha-receptor has an intrinsic ability to transduce a chemotactic signal, and that this signal is counteracted by overriding negative signals.
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Affiliation(s)
- K Yokote
- Ludwig Institute for Cancer Research, Box 595, Biomedical Center, S-751 24 Uppsala, Sweden
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40
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Yokote K, Osada H. [Indication and method of chest wall reconstruction]. Kyobu Geka 1996; 49:38-41. [PMID: 8558804] [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: 01/31/2023]
Abstract
Fifty two patients with chest wall resection were reviewed, with emphasis upon 16 patient with chest wall reconstruction. The latter 16 patient consisted of 6 with metastatic tumor, 3 of primary lung cancer, 2 of breast cancer, one of primary chest wall tumor, and others. Before 1985, reconstruction after chest wall resection was conducted in four cases by using methyl methacrylate (Resin). One patient developed erosion of the overlying skin due to protrusion of the edge of Resin-plate with delayed wound healing. Since 1986, we have employed muscle or myocutaneous flap and/or Marlex mesh in reconstruction of the chest wall defect. Twelve patients underwent surgery in this way. Neither paradoxical movement of the chest wall nor respiratory distress developed in the postoperative course of any patient. Thirty six of fifty two patients underwent chest wall resection without following reconstruction as in the former group. Of them one patient of anterior chest wall resection developed respiratory failure. We conclude that rib resection involving as many as three or more in the anterior chest wall, or four rib resection or more in the lateral chest wall, if the area of the defect is greater than 100 cm2, chest wall reconstruction is indicated. Moreover, we believe that muscle or myocutaneous flap and/or Marlex mesh in the best way of reconstruct in following chest wall resection.
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Affiliation(s)
- K Yokote
- Third Department of Surgery, St. Marianna Medical College, Kawasaki, Japan
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41
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Yokote K, Osada H, Mochizuki A, Kurisu S, Yamate N, Taira Y. [Surgical treatment of posterior mediastinal teratoma]. Kyobu Geka 1995; 48:1144-6. [PMID: 8815264] [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: 02/02/2023]
Abstract
A 22-year-old male patient was admitted to our hospital because of an abnormal shadow on a chest X-ray taken for routine examination. Preoperative diagnostic work up including chest computed tomography and magnetic resonance imaging suggested that the tumor would most likely to be a posterior mediastinal lipoma. Through a right thoracotomy the tumor was removed successfully. Histologically it proved to be a mature teratoma. The incidence, etiology and diagnostic procedure of the mediastinal teratoma was discussed.
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Affiliation(s)
- K Yokote
- Third Department of Surgery, St. Marianna Medical College, Kawasaki, Japan
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42
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Osada H, Yokote K, Arakawa H, Yamate N. Bilateral intralobar pulmonary sequestration. J Cardiovasc Surg (Torino) 1995; 36:611-3. [PMID: 8632037] [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: 02/01/2023]
Abstract
A 34-year-old male presented with an infected intralobar pulmonary sequestration of the left lower lobe. Aortography revealed bilateral anomalous systemic arteries, originating in the lower level of the descending thoracic aorta, to the lower lobe on each side. The portion of the right lower lobe, which was perfused by the anomalous systemic artery was seen otherwise normal in anatomy without any recognizable sequestered lung tissue. The patient underwent a left postero-lateral thoracotomy on June 22, 1994. Each aberrant artery was recognized to take off from a common branch of the descending aorta at the level of the diaphragm. A left lower lobectomy with division of the left aberrant artery as well as ligation of the right anomalous artery were done. A postoperative pulmonary perfusion scan depicted normal uptake of radioactivity in the right lower lobe, suggesting normal pulmonary arterial perfusion to the area receiving previously the anomalous systemic arterial flow. An anomalous systemic artery perfusing an otherwise normal lung can be classified as one of the forms of intralobar pulmonary sequestration and could be ligated without resection of the involved area of the lung.
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Affiliation(s)
- H Osada
- Department of Surgery, St. Marianna Medical College, Kawasaki, Japan
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43
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Ridefelt P, Yokote K, Claesson-Welsh L, Siegbahn A. PDGF-BB triggered cytoplasmic calcium responses in cells with endogenous or stably transfected PDGF beta-receptors. Growth Factors 1995; 12:191-201. [PMID: 8619925 DOI: 10.3109/08977199509036879] [Citation(s) in RCA: 15] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Platelet-derived growth factor-BB (PDGF-BB) triggered signal transduction was investigated in human foreskin fibroblasts with endogenous PDGF beta-receptors, and porcine aortic endothelial (PAE) cells with stably transfected PDGF beta-receptors. Immunoprecipitation and immunoblotting showed that PDGF induced dose-dependent autophosphorylation of PDGF beta-receptor, and the PLC-gamma associates with autophosphorylated PDGF beta-receptors and becomes phosphorylated. Activation of PLC-gamma is known to induce fluctuations of the concentration of cytoplasmic calcium ([Ca2+]i). Microfluorometry and digital imaging were employed for measurements of the concentration of [Ca2+]i. In both cell types the growth factor induced four types of [Ca2+]i responses; no rise, a small and sluggish monophasic rise, a biphasic rise with an initial transient peak followed by a sustain elevation, and finally regular oscillations. The frequencies and amplitudes of the oscillatory responses were independent of agonist concentration after stimulation with PDGF-BB. Latency, the period from application of stimulus to the first [Ca2+]i peak, was reduced at higher concentrations of agonist. Also, the proportion of responding cells increased with higher concentrations of ligand. Oscillations of [Ca2+]i were elicited at submaximal concentrations of agonist. In PAE cells PDGF-BB triggered a single [Ca2+]i peak in absence of external Ca2+. Ligand-induced oscillations and sustained increases of [Ca2+]i were counteracted by the inorganic Ca2+ channel blocker Ce3+. These results show that similar types of [Ca2+]i responses occur in different cell types independently of whether the PDGF beta-receptors are expressed endogeneously or after transfection. Potentially, the different [Ca2+]i responses have distinct physiological consequences.
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Affiliation(s)
- P Ridefelt
- Dept of Clinical Chemistry, Uppsala University, Sweden
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44
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Morisaki N, Yokote K, Takahashi K, Otabe M, Saito Y, Yoshida S, Ueda S. Role of phospholipase A2 in expression of the scavenger pathway in cultured aortic smooth muscle cells stimulated with phorbol 12-myristate 13-acetate. Biochem J 1994; 303 ( Pt 1):247-53. [PMID: 7945248 PMCID: PMC1137583 DOI: 10.1042/bj3030247] [Citation(s) in RCA: 8] [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: 01/28/2023]
Abstract
We have demonstrated that cultured intimal smooth muscle cells (SMC) from thickened intima can metabolize acetylated low-density lipoprotein (LDL) by a scavenger pathway, but medial SMC from normal arteries cannot. In this study we investigated the expression mechanism of the scavenger pathway in medial SMC using a phorbol ester. Medial SMC were incubated with 10(-10)-10(-7) M phorbol 12-myristate 13-acetate (PMA) for 1-24 h and then their degradation of 125I-labelled acetylated LDL was assayed. Unstimulated SMC degraded little acetylated LDL, but incubation for 24 h with PMA dose-dependently stimulated its degradation by SMC, the optimal PMA concentration being 1 x 10(-8) M. Induction of expression of the scavenger pathway required more than 4 h of incubation with PMA and was completely inhibited by cycloheximide. In addition expression of the scavenger pathway was not transient but stable. Induction of expression of the scavenger pathway by PMA was not inhibited by protein kinase C inhibitors, but was inhibited about 50% by phospholipase A2 inhibitors. The study, using various phorbol esters, indicated that induction of the scavenger pathway was well correlated with their ability to stimulate phospholipase A2 in medial SMC but not with their ability to activate protein kinase C. Moreover, incubation with exogenous phospholipase A2 (0.1-10 units/ml) or its product, lysophosphatidylcholine (0.01-100 micrograms/ml) dose-dependently increased degradation of 125I-labelled acetylated LDL in medial SMC. Lysophosphatidylcholine was most effective in various lysophospholipids. These results suggest that PMA induced the scavenger pathway in part by stimulating phospholipase A2 in medial SMC, and that a product, lysophosphatidylcholine, is a mediator of expression of the scavenger pathway.
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Affiliation(s)
- N Morisaki
- Second Department of Internal Medicine, School of Medicine, Chiba University, Japan
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45
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Morisaki N, Yokote K, Tashiro J, Inadera H, Kobayashi J, Kanzaki T, Saito Y, Yoshida S. Lipoprotein(a) is a risk factor for diabetic retinopathy in the elderly. J Am Geriatr Soc 1994; 42:965-7. [PMID: 8064105 DOI: 10.1111/j.1532-5415.1994.tb06588.x] [Citation(s) in RCA: 8] [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: 01/28/2023]
Abstract
OBJECTIVE To assess whether serum lipoprotein(a) is a risk factor for diabetic retinopathy in the elderly. DESIGN A cross-sectional study. SETTING Outpatient diabetic clinic. PATIENTS One hundred four noninsulin-dependent diabetic patients (35 males, 69 females). Twenty-three were less than 60 years of age (middle-aged), and 81 were 60 years or older (elderly). MEASUREMENT Levels of lipoprotein(a) (Lp(a)) and lipids were measured in fasting serum. HbA1c was also measured as an indicator of diabetic control. Other indicators possibly related to retinopathy were also checked. Retinopathy was estimated by photographs of fundi. RESULTS Significantly higher indicators in the group with retinopathy than in the group without were: HbA1c, Lp(a), duration of diabetes, and systolic blood pressure (BP) in the total cases; HbA1c, duration of diabetes, and Lp(a) in the middle-aged; HbA1c, systolic BP, and Lp(a) in the elderly. Multiple logistic regression analysis showed that only HbA1c and Lp(a) were independent risk factors for retinopathy in all cases and in the elderly. The incidence of retinopathy was positively correlated to serum Lp(a) levels. CONCLUSION Lp(a) is an independent risk factor for diabetic retinopathy.
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Affiliation(s)
- N Morisaki
- Second Department of Internal Medicine, School of Medicine, Chiba University, Japan
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46
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Yokote K, Mori S, Hansen K, McGlade J, Pawson T, Heldin CH, Claesson-Welsh L. Direct interaction between Shc and the platelet-derived growth factor beta-receptor. J Biol Chem 1994; 269:15337-43. [PMID: 8195171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The Src homology 2 (SH2) domain-containing Shc proteins p52shc and p46shc become phosphorylated upon activation of several tyrosine kinases and are implicated in mitogenic signal transduction. Ligand stimulation of the platelet-derived growth factor (PDGF) beta-receptor leads to autophosphorylation of tyrosine residues, which is known to mediate interactions with several SH2 domain-containing signaling molecules. In this study, we have characterized the interaction between the PDGF beta-receptor and Shc. PDGF beta-receptor coprecipitation in Shc immunoprecipitates was dependent on stimulation with PDGF-BB. The Shc SH2 domain expressed as a bacterial fusion protein bound the autophosphorylated PDGF beta-receptor. Moreover, the Shc SH2 domain could bind the autophosphorylated purified baculovirus-expressed PDGF beta-receptor intracellular domain, which indicates a direct association of Shc with the PDGF beta-receptor. Activation of the PDGF beta-receptor induced the preferential phosphorylation of p52shc. Tyrosine-phosphorylated Shc, in turn, formed a complex with the signaling molecule Grb2. Synthetic peptide analysis revealed that certain autophosphorylation sites in the PDGF beta-receptor (Tyr-579, Tyr-740, Tyr-751, and Tyr-771) were able to mediate the specific binding of the Shc SH2 domain as well as intact Shc proteins. A mutant PDGF beta-receptor in which Tyr-579 was replaced with phenylalanine showed 40% impaired association of Shc in vivo, but phosphorylation of Shc proteins was not affected. We conclude that multiple autophosphorylation sites in the PDGF beta-receptor are responsible for the binding of Shc. This is in contrast to previously characterized interactions between the PDGF beta-receptor and SH2 domain-containing proteins, which generally involve one high affinity binding site in the receptor.
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Affiliation(s)
- K Yokote
- Ludwig Institute for Cancer Research, Biomedical Center, Uppsala, Sweden
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47
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Yokote K, Mori S, Hansen K, McGlade J, Pawson T, Heldin C, Claesson-Welsh L. Direct interaction between Shc and the platelet-derived growth factor beta-receptor. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)36611-5] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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48
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Morisaki N, Watanabe S, Kobayashi J, Kanzaki T, Takahashi K, Yokote K, Tezuka M, Tashiro J, Inadera H, Saito Y. Diabetic control and progression of retinopathy in elderly patients: five-year follow-up study. J Am Geriatr Soc 1994; 42:142-5. [PMID: 8126325 DOI: 10.1111/j.1532-5415.1994.tb04941.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
OBJECTIVE To assess whether control of diabetes mellitus is as important in the elderly as in young and middle-aged diabetic patients in terms of progression of retinopathy. DESIGN A 5-year longitudinal cohort study. SETTING Outpatient diabetic clinic. PATIENTS One hundred fourteen non-insulin-dependent diabetic patients (30 males, 84 females) > or = 60 years of age. MEASUREMENTS Retinopathy was checked at the beginning and end of the follow-up period. During the 5-year follow-up period, demographic variables, body mass index, HbA1c, blood pressure, and plasma lipids were monitored. Retinopathy was classified as follows: grade 0, no lesion; grade 1, non-proliferative retinopathy; grade 2, pre-proliferative retinopathy; grade 3, proliferative retinopathy. Progression of retinopathy during the 5-year follow-up was defined as an increase in its grade. RESULTS At the start of the study, 13% of the patients already had retinopathy, all of grade 1. The 5-year follow-up study showed that progression of retinopathy was 23.6% in all cases, 22.2% in those with grade 0 initially, and 33.3% in those with grade 1 initially. The progression rates of retinopathy as a function of the mean HbA1c during the follow-up were as follows: lower than 7%, 2%; 7-8%, 20%; 8-9%, 40%; more than 9%, 61%. Multiple logistic regression analysis showed that, of the parameters examined, only HbA1c was a significant risk factor for progression of retinopathy. CONCLUSIONS Control of diabetes mellitus is the most important factor associated with prevention of progression of retinopathy in elderly patients.
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Affiliation(s)
- N Morisaki
- Second Department of Internal Medicine, School of Medicine, Chiba University, Japan
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49
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Wennström S, Siegbahn A, Yokote K, Arvidsson AK, Heldin CH, Mori S, Claesson-Welsh L. Membrane ruffling and chemotaxis transduced by the PDGF beta-receptor require the binding site for phosphatidylinositol 3' kinase. Oncogene 1994; 9:651-60. [PMID: 8290276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Activation of the platelet-derived growth factor (PDGF) beta-receptor results in motility responses in the forms of membrane ruffling and chemotaxis. Porcine aortic endothelial cells expressing the PDGF beta-receptor or a chimeric fibroblast growth factor (FGF) receptor, in which the endogenous kinase insert was replaced with the corresponding region from the PDGF beta-receptor, migrated efficiently towards a concentration gradient of PDGF-BB and bFGF, respectively, and exhibited both pronounced edge ruffling and circular membrane ruffling in response to ligand-stimulation. The wildtype FGF receptor-1 showed weak or no response in these assays. Further analyses were conducted on mutant receptors, in which tyrosine residues that can serve as autophosphorylation sites and thereby mediate interactions with specific signal transduction molecules, were changed to phenylalanine residues. Each one of the analysed mutants were mitogenically active, however, a mutant in which Tyr740 and Tyr751 were replaced failed to mediate ruffling and chemotaxis. These two residues are implicated in the binding of phosphatidylinositol 3' kinase. The notion that this enzyme is involved in PDGF beta-receptor-induced cell motility is furthermore supported by the finding that another mutant, in which Met743 and Met754 were replaced, and which failed to interact with phosphatidylinositol 3' kinase, was also unable to mediate motility responses.
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Affiliation(s)
- S Wennström
- Ludwig Institute for Cancer Research, Biomedical Center, Uppsala, Sweden
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50
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Yokote K, Morisaki N, Zenibayashi M, Ueda S, Kanzaki T, Saito Y, Yoshida S. The phospholipase-A2 reaction leads to increased monocyte adhesion of endothelial cells via the expression of adhesion molecules. Eur J Biochem 1993; 217:723-9. [PMID: 8223614 DOI: 10.1111/j.1432-1033.1993.tb18298.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Mononuclear cell invasion into the vascular-vessel wall is a very important initial step in the development of atherosclerotic lesions. Hypercholesterolemia leads to a marked adhesion of circulating blood monocytes to arterial endothelial cells in vivo, and minimally oxidized low-density lipoprotein enhances monocyte adhesion to endothelial cells in vitro. The activation of phospholipase A2 (PLA2) is also important in the oxidation of low-density lipoprotein by endothelial cells. In this study, we investigated the role of PLA2 activation in the adhesion of a leukemic monocyte cell line (THP-1 cells) to endothelial cells in vitro using an adhesion assay and a cell-ELISA technique. The treatment of human umbilical-cord-vein endothelial cells with PLA2 stimulators such as interleukin-1 beta, tumor necrosis factor and lipopolysaccharide all increased the adhesion of THP-1 cells to endothelial cells. Exogenous PLA2 also increased the adhesion of these cell types. The increased adhesion induced by these PLA2 stimulators, as well as PLA2 itself, was reversed by various inhibitors of the PLA2 reaction. A product of the PLA2 reaction, lysophosphatidylcholine, also increased cell adhesion. A cell-ELISA technique showed the enhanced expression of vascular-cell-adhesion-molecule 1 and intercellular-adhesion-molecule 1 to endothelial cells after treatment with PLA2 stimulators, PLA2 or lysophosphatidylcholine. These results suggest that the PLA2 reaction enhances monocyte adhesion to endothelial cells through the expression of cellular adhesion molecules.
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Affiliation(s)
- K Yokote
- First Department of Internal Medicine, School of Medicine, Chiba University, Japan
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