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Du L, Wang B, Wu M, Chen W, Wang W, Diao W, Ding M, Chen W, Cao W, Guo H, Zhang G. LINC00926 promotes progression of renal cell carcinoma via regulating miR-30a-5p/SOX4 axis and activating IFNγ-JAK2-STAT1 pathway. Cancer Lett 2023; 578:216463. [PMID: 37866544 DOI: 10.1016/j.canlet.2023.216463] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 10/17/2023] [Accepted: 10/19/2023] [Indexed: 10/24/2023]
Abstract
The role of long non-coding RNA (lncRNA) in the progression of renal cell carcinoma (RCC) remains further study. Whether lncRNA may be used to predict the immunotherapy efficacy of RCC is less studied. In this study, LINC00926 was found to be mainly located in cytoplasm by FISH and RNA nuclear-cytoplasmic fractionation. Downregulation of LINC00926 in RCC cell lines inhibited the progression and metastasis of RCC cells. RNA pull-down assay and dual-luciferase reporter assay demonstrated that LINC00926 functioned as miR-30a-5p sponge to facilitate SOX4 expression. LINC00926 overexpression in BALB/c mice enhanced PD-L1 surface expression and resulted in immune escape. Mechanistic investigations showed that LINC00926 competitively bound to Lyn, leading to the inhibition of CBL-mediated ubiquitination and degradation, and stabilized Lyn, contributing to the activation of IFNγ-JAK2-STAT1 signaling pathway. Moreover, LINC00926, together with PD-L1 or PD-1 expression, may predict the overall survival in RCC patients. Therefore, LINC00926 has the potential to be a novel therapeutic target and a biomarker to predict ICB immunotherapy response in RCC.
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Affiliation(s)
- Lin Du
- Department of Urology, Nanjing Drum Tower Hospital Clinical College of Southeast University, Nanjing, 210008, Jiangsu, China; Department of Urology, The First People's Hospital of Yancheng, Yancheng, 224006, Jiangsu, China
| | - Baojun Wang
- Department of Urology, The First Affiliated Hospital of Anhui Medical University, Hefei, 230039, Anhui, China; Department of Urology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, 210008, Jiangsu, China
| | - Mengtong Wu
- Department of Urology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, 210008, Jiangsu, China
| | - Weixu Chen
- Department of Urology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, 210008, Jiangsu, China
| | - Wendi Wang
- Department of Urology, Nanjing Drum Tower Hospital Clinical College of Southeast University, Nanjing, 210008, Jiangsu, China
| | - Wenli Diao
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of Urology, Nanjing University, Nanjing, 210008, Jiangsu, China
| | - Meng Ding
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of Urology, Nanjing University, Nanjing, 210008, Jiangsu, China
| | - Wei Chen
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of Urology, Nanjing University, Nanjing, 210008, Jiangsu, China
| | - Wenmin Cao
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of Urology, Nanjing University, Nanjing, 210008, Jiangsu, China
| | - Hongqian Guo
- Department of Urology, Drum Tower Hospital, Medical School of Nanjing University, Institute of Urology, Nanjing University, Nanjing, 210008, Jiangsu, China.
| | - Gutian Zhang
- Department of Urology, Nanjing Drum Tower Hospital Clinical College of Southeast University, Nanjing, 210008, Jiangsu, China; Department of Urology, Nanjing Drum Tower Hospital Clinical College of Nanjing University of Chinese Medicine, Nanjing, 210008, Jiangsu, China.
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2
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Li N, Lin G, Zhang H, Sun J, Gui M, Liu Y, Li W, Zhan Z, Li Y, Pan S, Liu J, Tang J. Lyn attenuates sepsis-associated acute kidney injury by inhibition of phospho-STAT3 and apoptosis. Biochem Pharmacol 2023; 211:115523. [PMID: 37003346 DOI: 10.1016/j.bcp.2023.115523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 03/22/2023] [Accepted: 03/23/2023] [Indexed: 04/03/2023]
Abstract
Sepsis-associated acute kidney injury (SA-AKI) is a life-threatening condition associated with high mortality and morbidity. However, the underlying pathogenesis of SA-AKI is still unclear. Lyn belongs to Src family kinases (SFKs), which exert numerous biological functions including modulation in receptor-mediated intracellular signaling and intercellular communication. Previous studies demonstrated that Lyn gene deletion obviously aggravates LPS-induced lung inflammation, but the role and possible mechanism of Lyn in SA-AKI have not been reported yet. Here, we found that Lyn protected against renal tubular injury in cecal ligation and puncture (CLP) induced AKI mouse model by inhibition of signal transducer and activator of transcription 3 (STAT3) phosphorylation and cell apoptosis. Moreover, Lyn agonist MLR-1023 pretreatment improved renal function, inhibited STAT3 phosphorylation and decreased cell apoptosis. Thus, Lyn appears to play a crucial role in orchestrating STAT3-mediated inflammation and cell apoptosis in SA-AKI. Hence, Lyn kinase may be a promising therapeutic target for SA-AKI.
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Affiliation(s)
- Nannan Li
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Guoxin Lin
- Department of Anesthesiology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Hao Zhang
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Jian Sun
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Ming Gui
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Yan Liu
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Wei Li
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Zishun Zhan
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Yisu Li
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Shiqi Pan
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Jishi Liu
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
| | - Juan Tang
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha 410013, China.
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Sakai J, Yang J, Chou CK, Wu WW, Akkoyunlu M. B cell receptor-induced IL-10 production from neonatal mouse CD19 +CD43 - cells depends on STAT5-mediated IL-6 secretion. eLife 2023; 12:83561. [PMID: 36735294 PMCID: PMC9934864 DOI: 10.7554/elife.83561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 01/31/2023] [Indexed: 02/04/2023] Open
Abstract
Newborns are unable to reach the adult-level humoral immune response partly due to the potent immunoregulatory role of IL-10. Increased IL-10 production by neonatal B cells has been attributed to the larger population of IL-10-producting CD43+ B-1 cells in neonates. Here, we show that neonatal mouse CD43- non-B-1 cells also produce substantial amounts of IL-10 following B cell antigen receptor (BCR) activation. In neonatal mouse CD43- non-B-1 cells, BCR engagement activated STAT5 under the control of phosphorylated forms of signaling molecules Syk, Btk, PKC, FAK, and Rac1. Neonatal STAT5 activation led to IL-6 production, which in turn was responsible for IL-10 production in an autocrine/paracrine fashion through the activation of STAT3. In addition to the increased IL-6 production in response to BCR stimulation, elevated expression of IL-6Rα expression in neonatal B cells rendered them highly susceptible to IL-6-mediated STAT3 phosphorylation and IL-10 production. Finally, IL-10 secreted from neonatal mouse CD43- non-B-1 cells was sufficient to inhibit TNF-α secretion by macrophages. Our results unveil a distinct mechanism of IL-6-dependent IL-10 production in BCR-stimulated neonatal CD19+CD43- B cells.
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Affiliation(s)
- Jiro Sakai
- Laboratory of Bacterial Polysaccharides, Division of Bacterial Parasitic and Allergenic Products, Center for Biologics Evaluation and Research, The US Food and Drug AdministrationSilver SpringUnited States
| | - Jiyeon Yang
- Laboratory of Bacterial Polysaccharides, Division of Bacterial Parasitic and Allergenic Products, Center for Biologics Evaluation and Research, The US Food and Drug AdministrationSilver SpringUnited States
| | - Chao-Kai Chou
- Facility for Biotechnology Resources, Center for Biologics Evaluation and Research, United States Food and Drug AdministrationSilver SpringUnited States
| | - Wells W Wu
- Facility for Biotechnology Resources, Center for Biologics Evaluation and Research, United States Food and Drug AdministrationSilver SpringUnited States
| | - Mustafa Akkoyunlu
- Laboratory of Bacterial Polysaccharides, Division of Bacterial Parasitic and Allergenic Products, Center for Biologics Evaluation and Research, The US Food and Drug AdministrationSilver SpringUnited States
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Chen JL, Chu PY, Huang CT, Huang TT, Wang WL, Lee YH, Chang YY, Dai MS, Shiau CW, Liu CY. Interfering B cell receptor signaling via SHP-1/p-Lyn axis shows therapeutic potential in diffuse large B-cell lymphoma. Mol Med 2022; 28:93. [PMID: 35941532 PMCID: PMC9358803 DOI: 10.1186/s10020-022-00518-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 07/25/2022] [Indexed: 11/21/2022] Open
Abstract
Background Diffuse large B cell lymphoma (DLBCL) is an aggressive and molecularly heterogeneous non-Hodgkin’s lymphoma. The B cell receptor (BCR) signaling pathway in DLBCL emerges as a new drug target. Protein phosphatase SHP-1 negatively regulates several oncogenic tyrosine kinases and plays a tumor suppressive role. Methods The direct SHP-1 agonists were used to evaluate the potential therapeutic implication of SHP-1 in DLBCL. Immunohistochemical staining for SHP-1 was quantified by H-score. The SHP-1 phosphatase activity was determined using tyrosine phosphatase assay. In vitro studies, including MTT, western blot analysis and cell apoptosis, were utilized to examined biological functions of SHP-1. Results Oral administration of SHP-1 agonist showed the potent anti-tumor effects compared to a selective Bruton’s tyrosine kinase (BTK) inhibitor ibrutinib in mice bearing U2932 xenografts. SHP-1 agonist increased SHP-1 activity as well as downregulated p-Lyn in vivo. Here, we demonstrated that immunohistochemical staining for SHP-1 expression was positive in 76% of DLBCL samples. SHP-1 agonist exerted anti-proliferative and apoptotic effects compared with ibrutinib in DLBCL cells. Mechanistically, SHP-1 agonist decreased BCR signaling, especially p-Lyn, and led to apoptosis. Conclusions These data suggest that SHP-1 negatively regulates phosphorylation of Lyn, and targeting SHP-1/p-Lyn using SHP-1 agonist has therapeutic potential for treatment of DLBCL. Supplementary Information The online version contains supplementary material available at 10.1186/s10020-022-00518-0.
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Affiliation(s)
- Ji-Lin Chen
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan
| | - Pei-Yi Chu
- Department of Pathology, Show Chwan Memorial Hospital, No. 542, Sec. 1, Chung-Shan Rd., Changhua City, 500, Taiwan.,School of Medicine, Fu Jen Catholic University, No. 510, Zhong-zheng Rd., Xin-zhuang Dist., New Taipei City, 24205, Taiwan.,Department of Health Food, Chung Chou University of Science and Technology, Changhua, 510, Taiwan
| | - Chun-Teng Huang
- School of Medicine, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.,Division of Hematology and Oncology, Department of Medicine, Yang-Ming Branch of Taipei City Hospital, No.145, Zhengzhou Rd., Datong Dist., Taipei, 10341, Taiwan
| | - Tzu-Ting Huang
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan
| | - Wan-Lun Wang
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan.,Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan
| | - Yu-Hsuan Lee
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan
| | - Yuan-Ya Chang
- Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan
| | - Ming-Shen Dai
- Hematology/Oncology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Chung-Wai Shiau
- Institute of Biopharmaceutical Sciences, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Li-Nong Street, Taipei, 112, Taiwan
| | - Chun-Yu Liu
- Comprehensive Breast Health Center, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan. .,School of Medicine, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan. .,Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan. .,Division of Transfusion Medicine, Department of Medicine, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei, 112, Taiwan.
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5
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Zhu Y, Gu H, Yang L, Li N, Chen Q, Kang D, Lin S, Jing Y, Jiang P, Chen Q, Luo L, Liu J, Chang J, Li Z, Wang Y, Dai X, Miller H, Westerberg LS, Park C, Kubo M, Gong Q, Dong L, Liu C. Involvement of MST1/mTORC1/STAT1 activity in the regulation of B-cell receptor signalling by chemokine receptor 2. Clin Transl Med 2022; 12:e887. [PMID: 35875970 PMCID: PMC9309749 DOI: 10.1002/ctm2.887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/12/2021] [Accepted: 05/05/2022] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND CCR2 is involved in maintaining immune homeostasis and regulating immune function. This study aims to elucidate the mechanism by which CCR2 regulates B-cell signalling. METHODS In Ccr2-knockout mice, the development and differentiation of B cells, BCR proximal signals, actin movement and B-cell immune response were determined. Besides, the level of CCR2 in PBMC of SLE patients was analysed by bioinformatics. RESULTS CCR2 deficiency reduces the proportion and number of follicular B cells, upregulates BCR proximal signalling and enhances the oxidative phosphorylation of B cells. Meanwhile, increased actin filaments aggregation and its associated early-activation events of B cells are also induced by CCR2 deficiency. The MST1/mTORC1/STAT1 axis in B cells is responsible for the regulation of actin remodelling, metabolic activities and transcriptional signalling, specific MST1, mTORC1 or STAT1 inhibitor can rescue the upregulated BCR signalling. Glomerular IgG deposition is obvious in CCR2-deficient mice, accompanied by increased anti-dsDNA IgG level. Additionally, the CCR2 expression in peripheral B cells of SLE patients is decreased than that of healthy controls. CONCLUSIONS CCR2 can utilise MST1/mTORC1/STAT1 axis to regulate BCR signalling. The interaction between CCR2 and BCR may contribute to exploring the mechanism of autoimmune diseases.
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Affiliation(s)
- Yingzi Zhu
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Heng Gu
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Lu Yang
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Na Li
- Department of Immunology, School of MedicineYangtze UniversityJingzhouChina
| | - Qiuyue Chen
- Department of Immunology, School of MedicineYangtze UniversityJingzhouChina
| | - Danqing Kang
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Shengyan Lin
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Yukai Jing
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Panpan Jiang
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Qianglin Chen
- Department of Immunology, School of MedicineYangtze UniversityJingzhouChina
| | - Li Luo
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Ju Liu
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Jiang Chang
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Zhenzhen Li
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Yi Wang
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Xin Dai
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Heather Miller
- Department of Research and DevelopmentBD BiosciencesSan JoseCaliforniaUnited States
| | - Lisa S. Westerberg
- Department of Microbiology Tumor and Cell BiologyKarolinska InstitutetStockholmSweden
| | - Chan‐Sik Park
- Department of Pathology, Asan Medical CenterUniversity of Ulsan College of MedicineSongpa‐guSeoulKorea
| | - Masato Kubo
- Laboratory for Cytokine Regulation, Center for Integrative Medical Science (IMS)RIKEN Yokohama InstituteKanagawaJapan
| | - Quan Gong
- Department of Immunology, School of MedicineYangtze UniversityJingzhouChina
| | - Lingli Dong
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Chaohong Liu
- Department of Pathogen Biology, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
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6
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Saha A, Hyzy S, Lamothe T, Hammond K, Clark N, Lanieri L, Bhattarai P, Palchaudhuri R, Gillard GO, Proctor J, Riddle MJ, Panoskaltsis-Mortari A, MacMillan ML, Wagner JE, Kiem HP, Olson LM, Blazar BR. A CD45-targeted antibody-drug conjugate successfully conditions for allogeneic hematopoietic stem cell transplantation in mice. Blood 2022; 139:1743-1759. [PMID: 34986233 PMCID: PMC8931510 DOI: 10.1182/blood.2021012366] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 11/29/2021] [Indexed: 12/18/2022] Open
Abstract
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a potentially curative treatment of patients with nonmalignant or malignant blood disorders. Its success has been limited by graft-versus-host disease (GVHD). Current systemic nontargeted conditioning regimens mediate tissue injury and potentially incite and amplify GVHD, limiting the use of this potentially curative treatment beyond malignant disorders. Minimizing systemic nontargeted conditioning while achieving alloengraftment without global immune suppression is highly desirable. Antibody-drug-conjugates (ADCs) targeting hematopoietic cells can specifically deplete host stem and immune cells and enable alloengraftment. We report an anti-mouse CD45-targeted-ADC (CD45-ADC) that facilitates stable murine multilineage donor cell engraftment. Conditioning with CD45-ADC (3 mg/kg) was effective as a single agent in both congenic and minor-mismatch transplant models resulting in full donor chimerism comparable to lethal total body irradiation (TBI). In an MHC-disparate allo-HSCT model, pretransplant CD45-ADC (3 mg/kg) combined with low-dose TBI (150 cGy) and a short course of costimulatory blockade with anti-CD40 ligand antibody enabled 89% of recipients to achieve stable alloengraftment (mean value: 72%). When CD45-ADC was combined with pretransplant TBI (50 cGy) and posttransplant rapamycin, cyclophosphamide (Cytoxan), or a JAK inhibitor, 90% to 100% of recipients achieved stable chimerism (mean: 77%, 59%, 78%, respectively). At a higher dose (5 mg/kg), CD45-ADC as a single agent was sufficient for rapid, high-level multilineage chimerism sustained through the 22 weeks observation period. Therefore, CD45-ADC has the potential utility to confer the benefit of fully myeloablative conditioning but with substantially reduced toxicity when given as a single agent or at lower doses in conjunction with reduced-intensity conditioning.
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Affiliation(s)
- Asim Saha
- Division of Blood & Marrow Transplant & Cellular Therapy, Masonic Cancer Center and Department of Pediatrics, University of Minnesota, Minneapolis, MN
| | | | | | | | | | | | | | | | | | | | - Megan J Riddle
- Division of Blood & Marrow Transplant & Cellular Therapy, Masonic Cancer Center and Department of Pediatrics, University of Minnesota, Minneapolis, MN
| | - Angela Panoskaltsis-Mortari
- Division of Blood & Marrow Transplant & Cellular Therapy, Masonic Cancer Center and Department of Pediatrics, University of Minnesota, Minneapolis, MN
| | - Margaret L MacMillan
- Division of Blood & Marrow Transplant & Cellular Therapy, Masonic Cancer Center and Department of Pediatrics, University of Minnesota, Minneapolis, MN
| | - John E Wagner
- Division of Blood & Marrow Transplant & Cellular Therapy, Masonic Cancer Center and Department of Pediatrics, University of Minnesota, Minneapolis, MN
| | - Hans-Peter Kiem
- Fred Hutchinson Cancer Research Center and Department of Medicine, University of Washington, Seattle, WA
| | | | - Bruce R Blazar
- Division of Blood & Marrow Transplant & Cellular Therapy, Masonic Cancer Center and Department of Pediatrics, University of Minnesota, Minneapolis, MN
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Patel DA, Schroeder MA, Choi J, DiPersio JF. Mouse models of graft-versus-host disease. Methods Cell Biol 2022; 168:41-66. [DOI: 10.1016/bs.mcb.2021.12.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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8
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Proteomic signatures of myeloid derived suppressor cells from liver and lung metastases reveal functional divergence and potential therapeutic targets. Cell Death Discov 2021; 7:232. [PMID: 34482371 PMCID: PMC8418613 DOI: 10.1038/s41420-021-00621-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/09/2021] [Accepted: 08/19/2021] [Indexed: 12/13/2022] Open
Abstract
Myeloid-derived suppressor cells (MDSCs) promote immunosuppressive activities in the tumor microenvironment (TME), resulting in increased tumor burden and diminishing the anti-tumor response of immunotherapies. While primary and metastatic tumors are typically the focal points of therapeutic development, the immune cells of the TME are differentially programmed by the tissue of the metastatic site. In particular, MDSCs are programmed uniquely within different organs in the context of tumor progression. Given that MDSC plasticity is shaped by the surrounding environment, the proteomes of MDSCs from different metastatic sites are hypothesized to be unique. A bottom-up proteomics approach using sequential window acquisition of all theoretical mass spectra (SWATH-MS) was used to quantify the proteome of CD11b+ cells derived from murine liver metastases (LM) and lung metastases (LuM). A comparative proteomics workflow was employed to compare MDSC proteins from LuM (LuM-MDSC) and LM (LM-MDSC) while also elucidating common signaling pathways, protein function, and possible drug-protein interactions. SWATH-MS identified 2516 proteins from 200 µg of sample. Of the 2516 proteins, 2367 have matching transcriptomic data. Upregulated proteins from lung and liver-derived murine CD11b+ cells with matching mRNA transcriptomic data were categorized based on target knowledge and level of drug development. Comparative proteomic analysis demonstrates that liver and lung tumor-derived MDSCs have distinct proteomes that may be subject to pharmacologic manipulation.
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9
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Nakamura M, Souri EA, Osborn G, Laddach R, Chauhan J, Stavraka C, Lombardi S, Black A, Khiabany A, Khair DO, Figini M, Winship A, Ghosh S, Montes A, Spicer JF, Bax HJ, Josephs DH, Lacy KE, Tsoka S, Karagiannis SN. IgE Activates Monocytes from Cancer Patients to Acquire a Pro-Inflammatory Phenotype. Cancers (Basel) 2020; 12:E3376. [PMID: 33203088 PMCID: PMC7698027 DOI: 10.3390/cancers12113376] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/27/2020] [Accepted: 11/12/2020] [Indexed: 02/08/2023] Open
Abstract
IgE contributes to host-protective functions in parasitic and bacterial infections, often by monocyte and macrophage recruitment. We previously reported that monocytes contribute to tumour antigen-specific IgE-mediated tumour growth restriction in rodent models. Here, we investigate the impact of IgE stimulation on monocyte response, cellular signalling, secretory and tumour killing functions. IgE cross-linking on human monocytes with polyclonal antibodies to mimic formation of immune complexes induced upregulation of co-stimulatory (CD40, CD80, CD86), and reduced expression of regulatory (CD163, CD206, MerTK) monocyte markers. Cross-linking and tumour antigen-specific IgE antibody-dependent cellular cytotoxicity (ADCC) of cancer cells by cancer patient-derived monocytes triggered release of pro-inflammatory mediators (TNFα, MCP-1, IL-10, CXCL-10, IL-1β, IL-6, IL-23). High intratumoural gene expression of these mediators was associated with favourable five-year overall survival in ovarian cancer. IgE cross-linking of trimeric FcεRI on monocytes stimulated the phosphorylation of intracellular protein kinases widely reported to be downstream of mast cell and basophil tetrameric FcεRI signalling. These included recently-identified FcεRI pathway kinases Fgr, STAT5, Yes and Lck, which we now associate with monocytes. Overall, anti-tumour IgE can potentiate pro-inflammatory signals, and prime tumour cell killing by human monocytes. These findings will inform the development of IgE monoclonal antibody therapies for cancer.
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Affiliation(s)
- Mano Nakamura
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
| | - Elmira Amiri Souri
- Department of Informatics, Faculty of Natural & Mathematical Sciences, King’s College London, London WC2B 4BG, UK; (E.A.S.); (S.T.)
| | - Gabriel Osborn
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
| | - Roman Laddach
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- Department of Informatics, Faculty of Natural & Mathematical Sciences, King’s College London, London WC2B 4BG, UK; (E.A.S.); (S.T.)
| | - Jitesh Chauhan
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Chara Stavraka
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Sara Lombardi
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Anna Black
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Atousa Khiabany
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Duaa O. Khair
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
| | - Mariangela Figini
- Biomarker Unit, Department of Applied Research and Technology Development, Fondazione, IRCCS Istituto Nazionale dei Tumouri Milano, 20133 Milan, Italy;
| | - Anna Winship
- Department of Medical Oncology and Clinical Oncology, Guy’s and St Thomas’ NHS Foundation Trust, London SE1 9RT, UK; (A.W.); (S.G.); (A.M.)
| | - Sharmistha Ghosh
- Department of Medical Oncology and Clinical Oncology, Guy’s and St Thomas’ NHS Foundation Trust, London SE1 9RT, UK; (A.W.); (S.G.); (A.M.)
| | - Ana Montes
- Department of Medical Oncology and Clinical Oncology, Guy’s and St Thomas’ NHS Foundation Trust, London SE1 9RT, UK; (A.W.); (S.G.); (A.M.)
| | - James F. Spicer
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Heather J. Bax
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Debra H. Josephs
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Hospital, London SE1 9RT, UK;
| | - Katie E. Lacy
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
| | - Sophia Tsoka
- Department of Informatics, Faculty of Natural & Mathematical Sciences, King’s College London, London WC2B 4BG, UK; (E.A.S.); (S.T.)
| | - Sophia N. Karagiannis
- St. John’s Institute of Dermatology, School of Basic & Medical Biosciences, King’s College London, Tower Wing, 9th Floor, Guy’s Hospital, London SE1 9RT, UK; (M.N.); (G.O.); (R.L.); (J.C.); (C.S.); (S.L.); (A.B.); (A.K.); (D.O.K.); (H.J.B.); (D.H.J.); (K.E.L.)
- Breast Cancer Now Research Unit, School of Cancer & Pharmaceutical Sciences, King’s College London, Guy’s Cancer Centre, London SE1 9RT, UK
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STAT3 Differentially Regulates TLR4-Mediated Inflammatory Responses in Early or Late Phases. Int J Mol Sci 2020; 21:ijms21207675. [PMID: 33081347 PMCID: PMC7589049 DOI: 10.3390/ijms21207675] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/02/2020] [Accepted: 10/14/2020] [Indexed: 12/17/2022] Open
Abstract
Toll-like receptor 4 (TLR4) signaling is an important therapeutic target to manage lipopolysaccharide (LPS)-induced inflammation. The transcription factor signal transducer and activator of transcription 3 (STAT3) has been identified as an important regulator of various immune-related diseases and has generated interest as a therapeutic target. Here, we investigated the time-dependent roles of STAT3 in LPS-stimulated RAW264.7 macrophages. STAT3 inhibition induced expression of the pro-inflammatory genes iNOS and COX-2 at early time points. STAT3 depletion resulted in regulation of nuclear translocation of nuclear factor (NF)-κB subunits p50 and p65 and IκBα/Akt/PI3K signaling. Moreover, we found that one Src family kinase, Lyn kinase, was phosphorylated in STAT3 knockout macrophages. In addition to using pharmacological inhibition of NF-κB, we found out that STAT3KO activation of NF-κB subunit p50 and p65 and expression of iNOS was significantly inhibited; furthermore, Akt tyrosine kinase inhibitors also inhibited iNOS and COX-2 gene expression during early time points of LPS stimulation, demonstrating an NF-κB- Akt-dependent mechanism. On the other hand, iNOS expression was downregulated after prolonged treatment with LPS. Activation of NF-κB signaling was also suppressed, and consequently, nitric oxide (NO) production and cell invasion were repressed. Overall, our data indicate that STAT3 differentially regulates early- and late-phase TLR4-mediated inflammatory responses.
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11
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Markovics A, Toth DM, Glant TT, Mikecz K. Regulation of autoimmune arthritis by the SHP-1 tyrosine phosphatase. Arthritis Res Ther 2020; 22:160. [PMID: 32586377 PMCID: PMC7318740 DOI: 10.1186/s13075-020-02250-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 06/16/2020] [Indexed: 12/20/2022] Open
Abstract
Background The Src homology region 2 domain-containing phosphatase-1 (SHP-1) is known to exert negative regulatory effects on immune cell signaling. Mice with mutations in the Shp1 gene develop inflammatory skin disease and autoimmunity, but no arthritis. We sought to explore the role of SHP-1 in arthritis using an autoimmune mouse model of rheumatoid arthritis. We generated Shp1 transgenic (Shp1-Tg) mice to study the impact of SHP-1 overexpression on arthritis susceptibility and adaptive immune responses. Methods SHP-1 gene and protein expression as well as tyrosine phosphatase activity were evaluated in spleen cells of transgenic and wild type (WT) mice. WT and Shp1-Tg (homozygous or heterozygous for the transgene) mice were immunized with human cartilage proteoglycan (PG) in adjuvant, and arthritis symptoms were monitored. Protein tyrosine phosphorylation level, net cytokine secretion, and serum anti-human PG antibody titers were measured in immune cells from WT and Shp1-Tg mice. WT mice were treated with regorafenib orally to activate SHP-1 either before PG-induced arthritis (PGIA) symptoms developed (preventive treatment) or starting at an early stage of disease (therapeutic treatment). Data were statistically analyzed and graphs created using GraphPad Prism 8.0.2 software. Results SHP-1 expression and tyrosine phosphatase activity were elevated in both transgenic lines compared to WT mice. While all WT mice developed arthritis after immunization, none of the homozygous Shp1-Tg mice developed the disease. Heterozygous transgenic mice, which showed intermediate PGIA incidence, were selected for further investigation. We observed differences in interleukin-4 and interleukin-10 production in vitro, but serum anti-PG antibody levels were not different between the genotypes. We also found decreased tyrosine phosphorylation of several proteins of the JAK/STAT pathway in T cells from PG-immunized Shp1-Tg mice. Regorafenib administration to WT mice prevented the development of severe PGIA or reduced disease severity when started after disease onset. Conclusions Resistance to arthritis in the presence of SHP-1 overexpression likely results from the impairment of tyrosine phosphorylation (deactivation) of key immune cell signaling proteins in the JAK/STAT pathway, due to the overwhelming tyrosine phosphatase activity of the enzyme in Shp1-Tg mice. Our study is the first to investigate the role of SHP-1 in autoimmune arthritis using animals overexpressing this phosphatase. Pharmacological activation of SHP-1 might be considered as a new approach to the treatment of autoimmune arthritis.
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Affiliation(s)
- Adrienn Markovics
- Department of Orthopedic Surgery, Section of Molecular Medicine, Rush University Medical Center, 1735 W. Harrison Street, Cohn Research Building, Room 741, Chicago, IL, 60612, USA.
| | - Daniel M Toth
- Department of Orthopedic Surgery, Section of Molecular Medicine, Rush University Medical Center, 1735 W. Harrison Street, Cohn Research Building, Room 741, Chicago, IL, 60612, USA
| | - Tibor T Glant
- Department of Orthopedic Surgery, Section of Molecular Medicine, Rush University Medical Center, 1735 W. Harrison Street, Cohn Research Building, Room 741, Chicago, IL, 60612, USA
| | - Katalin Mikecz
- Department of Orthopedic Surgery, Section of Molecular Medicine, Rush University Medical Center, 1735 W. Harrison Street, Cohn Research Building, Room 741, Chicago, IL, 60612, USA
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12
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Abboud R, Choi J, Ruminski P, Schroeder MA, Kim S, Abboud CN, DiPersio JF. Insights into the role of the JAK/STAT signaling pathway in graft- versus-host disease. Ther Adv Hematol 2020; 11:2040620720914489. [PMID: 32537114 PMCID: PMC7268158 DOI: 10.1177/2040620720914489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 02/25/2020] [Indexed: 12/15/2022] Open
Abstract
Allogeneic hematopoietic transplantation (allo-HCT) is a curative therapy for a variety of hematologic malignancies, primarily through immune-mediated clearance of malignant cells. This graft-versus-leukemia (GvL) effect is mediated by alloreactive donor T-cells against recipient malignant cells. Unfortunately, graft versus host disease is a potentially lethal complication of this procedure, also mediated by alloreactive donor T-cells against recipient normal tissues. Graft-versus-host disease (GVHD) remains a key contributor to nonrelapse mortality and long-term morbidity in patients undergoing allo-HCT. Reducing GVHD without interfering with - or ideally while enhancing - GvL, would improve outcomes and increase patient eligibility for allo-HCT. The JAK/STAT signaling pathway acts downstream of over 50 cytokines and is central to a wide variety of inflammatory pathways. These pathways play a role in the development and maintenance of GVHD throughout the disease process and within T-cells, B-cells, macrophages, neutrophils, and natural killer cells. Agents targeting JAK/STAT signaling pathways have shown clinical efficacy and gained US Food and Drug Administration approval for numerous diseases. Here, we review the preclinical and clinical evidence for the role of JAK/STAT signaling in the development and maintenance of GVHD and the utility of blocking agents at preventing and treating GVHD.
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Affiliation(s)
- Ramzi Abboud
- Division of Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Jaebok Choi
- Division of Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Peter Ruminski
- Division of Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Mark A Schroeder
- Division of Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Sena Kim
- Division of Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Camille N Abboud
- Division of Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - John F DiPersio
- Virginia E. and Samuel J. Golman Professor, Chief, Division of Oncology, Deputy Director, Siteman Cancer Center, Washington University School of Medicine, 66o S. Euclid Avenue, CB 8007, Saint Louis, MO 63110, USA
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13
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Vašíček O, Fedr R, Skoroplyas S, Chalupa D, Sklenář M, Tharra PR, Švenda J, Kubala L. Natural pseurotins and analogs thereof inhibit activation of B-cells and differentiation into the plasma cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2020; 69:153194. [PMID: 32146299 DOI: 10.1016/j.phymed.2020.153194] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 01/29/2020] [Accepted: 02/21/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND The frequency of allergic diseases is constantly rising. Dysregulated production of isotype E immunoglobulins is one of the key factors behind allergic reactions and its modulation is therefore an important target for pharmacological intervention. Natural products of the pseurotin family were reported to be inhibitors of IgE production in B-cells. Mechanistic details underlying these effects are however not well understood. PURPOSE In the present study, we synthesized new analogs of natural pseurotins and extensively investigated their inhibitory effects on activation, proliferation and differentiation of B-cells, as well as on the production of IgE. STUDY DESIGN Effects of two natural pseurotins (pseurotins A and D) and a collection of fully synthetic pseurotin analogs were studied on mouse B-cells stimulated by the combination of IL-4 and E. coli lipopolysaccharide. The IgE production was determined along with cell viability and cell proliferation. The phosphorylation of selected members of the STAT transcription factor family was subsequently investigated. Finally, the in vivo effect of pseurotin D on the ovalbumin-induced delayed type hypersensitivity response was tested in mice. RESULTS We discovered that several fully synthetic pseurotin analogs were able to decrease the production of IgE in stimulated B-cells with potency comparable to that of pseurotins A and D. We found that the two natural pseurotins and the active synthetic analogs inhibited the phosphorylation of STAT3, STAT5 and STAT6 proteins in stimulated B-cells, resulting in the inhibition of B-cell proliferation and differentiation into the plasma cells. In vivo, pseurotin D decreased ovalbumin-induced foot pad edema. CONCLUSION Our results advance the current mechanistic understanding of the pseurotin-induced inhibition of IgE production in B-cells by linking the effect to STAT signaling, and associated modulation of B-cell proliferation and differentiation. Together with our finding that structurally simpler pseurotin analogs were able to reproduce the effects of natural pseurotins, the presented work has implications for the future research on these secondary metabolites in the context of allergic diseases.
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Affiliation(s)
- Ondřej Vašíček
- Institute of Biophysics of the Czech Academy of Sciences, Brno 612 65, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Brno 656 91, Czech Republic
| | - Radek Fedr
- Institute of Biophysics of the Czech Academy of Sciences, Brno 612 65, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Brno 656 91, Czech Republic
| | - Svitlana Skoroplyas
- Institute of Biophysics of the Czech Academy of Sciences, Brno 612 65, Czech Republic; Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic
| | - David Chalupa
- Department of Chemistry, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic
| | - Matěj Sklenář
- Department of Chemistry, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic
| | - Prabhakara Rao Tharra
- Department of Chemistry, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic
| | - Jakub Švenda
- International Clinical Research Center, St. Anne's University Hospital, Brno 656 91, Czech Republic; Department of Chemistry, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic.
| | - Lukáš Kubala
- Institute of Biophysics of the Czech Academy of Sciences, Brno 612 65, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Brno 656 91, Czech Republic; Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic.
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14
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Guo X, Zhang Z, Zeng T, Lim YC, Wang Y, Xie X, Yang S, Huang C, Xu M, Tao L, Zeng H, Sun L, Li X. cAMP-MicroRNA-203-IFNγ network regulates subcutaneous white fat browning and glucose tolerance. Mol Metab 2019; 28:36-47. [PMID: 31327757 PMCID: PMC6822238 DOI: 10.1016/j.molmet.2019.07.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/17/2019] [Accepted: 07/02/2019] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE Brown and beige adipocytes in humans and rodents are specialized to burn lipids for heat generation as a natural defense against cold and obesity, which is advantageous to metabolic homeostasis. MicroRNAs as another regulatory layer to regulate metabolic homeostasis attracted a lot of attentions. Our previous work revealed microRNA (miR)-203 as a brown adipocyte-enriched microRNA involved in brown adipocytes development. However, the potential role of miR-203 in adipose tissue metabolic homeostasis has not been determined in vivo. In this study, we investigate the potential role of miR-203 in subcutaneous white adipose tissue (sub-WAT) browning and metabolic homeostasis. METHODS We investigated the relationship between miR-203 and energy homeostasis in adipose tissue from cold exposed, high fat diet (HFD) fed, ob/ob and db/db mice. The functions of miR-203 on sub-WAT browning were validated through miR-203 knockdown or overexpression. The miR-203 targeted signal pathway was screened by RNAseq analysis. Luciferase report assay, western blot, and qPCR were performed to establish the miR-203 related upstream and downstream signal pathway in vivo and in vitro. The functions of miR-203 on obesity and metabolic homeostasis were validated through GTT/ITT and western blot on high fat diet-induced obesity in C57 mice. ELISA was used to determine the concentration of IFN-γ. Flow cytometry analysis was performed to determine the infiltration of macrophages in adipose tissue. RESULTS MiR-203 expression positively correlates with energy expenditure, and overexpression of miR-203 could enhance sub-WAT browning in normal diet (ND) condition. Mechanistically, the expression of miR-203 is activated by cAMP-dependent C/EBPβ up-regulation. Subsequently, miR-203 inhibits IFN-γ signal pathway activation by directly targeting Lyn, which is an activator of Jak1-Stat1. Moreover, the forced expression of miR-203 could improve insulin sensitivity and resist high fat diet-induced obesity by inhibiting IFN-γ. CONCLUSIONS MicroRNA-203 (miR-203) promotes white adipose tissue browning in cold exposed mice and improves glucose tolerance in HFD fed mice by repressing IFN-γ. Since miR-203 is activated by cAMP-dependent C/EBPβ up-regulation and directly represses IFN-γ signal pathway, we declare that miR-203 acts as a messenger between cAMP signal pathway and IFN-γ signal pathway.
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Affiliation(s)
- Xiaolong Guo
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Zhichun Zhang
- Biology Science Institutes, Chongqing Medical University, PR China; Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore
| | - Ting Zeng
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Yen Ching Lim
- Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore
| | - Yumeng Wang
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Xinxin Xie
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Song Yang
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Chenglong Huang
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Min Xu
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Linfen Tao
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Hongxiang Zeng
- Biology Science Institutes, Chongqing Medical University, PR China
| | - Lei Sun
- Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore.
| | - Xi Li
- Biology Science Institutes, Chongqing Medical University, PR China.
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15
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Zhou J, Zhang Q, Henriquez JE, Crawford RB, Kaminski NE. Lymphocyte-Specific Protein Tyrosine Kinase (LCK) is Involved in the Aryl Hydrocarbon Receptor-Mediated Impairment of Immunoglobulin Secretion in Human Primary B Cells. Toxicol Sci 2019; 165:322-334. [PMID: 29860352 DOI: 10.1093/toxsci/kfy133] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The aryl hydrocarbon receptor (AHR) is a cytosolic ligand-activated transcription factor involved in xenobiotic sensing, cell cycle regulation, and cell development. In humans, the activation of AHR by 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD), a high affinity AHR-ligand, impairs the secretion of immunoglobulin M (IgM) to suppress humoral immunity. However, the mechanisms bridging the activation of AHR and the impairment of IgM secretion by human primary B cells remain poorly understood. Recent transcriptomic analysis revealed upregulation of lymphocyte-specific protein tyrosine kinase (LCK) in AHR-activated human primary B cells. LCK is a well-characterized tyrosine kinase that phosphorylates critical signaling proteins involved in activation and cytokine production in T cells. Conversely, the role of LCK in human primary B cells is not well understood. In the current studies, we have verified the transcriptomic finding by detecting AHR-mediated upregulation of LCK protein in human primary B cells. We also confirmed the role of AHR in the upregulation of LCK by using a specific AHR antagonist, which abolished the AHR-mediated increase of LCK. Furthermore, we have confirmed the role of LCK in the AHR-mediated suppression of IgM by using LCK specific inhibitors, which restored the IgM secretion by human B cells in the presence of TCDD. Collectively, the current studies demonstrate a novel role of LCK in IgM response and provide new insights into the mechanism for AHR-mediated impairment of immunoglobulin secretion by human primary B cells.
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Affiliation(s)
- Jiajun Zhou
- Department of Microbiology & Molecular Genetics.,Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824
| | - Qiang Zhang
- Department of Environmental Health, Rollins School of Public Health, Emory University, Georgia 30322
| | - Joseph E Henriquez
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824.,Department of Pharmacology & Toxicology, Michigan State University, East Lansing, Michigan 48824
| | - Robert B Crawford
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824
| | - Norbert E Kaminski
- Department of Microbiology & Molecular Genetics.,Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan 48824.,Department of Pharmacology & Toxicology, Michigan State University, East Lansing, Michigan 48824
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16
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Masir N, Akhter A, Roshan TM, Florence CS, Abdul-Rahman F, Tumian NR, Kean-Chang P, Elyamany G, Shabani-Rad MT, Mansoor A. Diffuse large B-cell lymphoma in Southeast Asian cohort: expression patterns of B-cell receptor (BCR) repertoire and its linkage with molecular subtypes and response to R-CHOP therapy. J Clin Pathol 2019; 72:630-635. [PMID: 31189540 DOI: 10.1136/jclinpath-2019-205837] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/06/2019] [Accepted: 05/22/2019] [Indexed: 12/23/2022]
Abstract
AIMS Heightened B-cell receptor (BCR) activity in diffuse large B-cell lymphoma (DLBCL) is well established, and a subset of patients with relapsed DLBCL can benefit from BCR-targeted therapies. Universal outreach of such emerging therapies mandates forming a global landscape of BCR molecular signalling in DLBCL, including Southeast Asia. METHODS 79 patients with DLBCL (nodal, 59% and extranodal, 41%) treated with rituximab combined with cyclophosphamide, doxorubicin, vincristine and prednisone (R-CHOP) therapy were selected. Expression levels of BCR and linked signalling pathway molecules were inter-related with Lymph2Cx-based cell of origin (COO) types and overall survival (OS). RESULTS Activated B-cell (ABC) type DLBCL constituted 49% (39/79) compared with germinal centre B-cell (GCB) type DLBCL (29/79; 37%) and revealed poor prognosis (p=0.013). In ABC-DLBCL, high BTK expression exerted poor response to R-CHOP, while OS in ABC-DLBCL with low BTK expression was similar to GCB-DLBCL subtype (p=0.004). High LYN expression coupled with a poor OS for ABC-DLBCL as well as GCB-DLBCL subtypes (p=0.001). Furthermore, high coexpression of BTK/LYN (BTK high/LYN high) showed poor OS (p=0.019), which linked with upregulation of several genes associated with BCR repertoire and nuclear factor-kappa B pathway (p<0.01). In multivariate analysis, high BTK and LYN expression retained prognostic significance against established clinical predictive factors such as age, International Prognostic Index and COO (p<0.05). CONCLUSIONS Our data provide a clear association between high BCR activity in DLBCL and response to therapy in a distinct population. Molecular data provided here will pave the pathway for the provision of promising novel-targeted therapies to patients with DLBCL in Southeast Asia.
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Affiliation(s)
- Noraidah Masir
- Department of Pathology, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Wilayah Persekutuan, Malaysia
| | - Ariz Akhter
- Pathology and Laboratory Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Tariq M Roshan
- Pathology and Laboratory Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Chandramaya Sabrina Florence
- Department of Pathology, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Wilayah Persekutuan, Malaysia
| | - Faridah Abdul-Rahman
- Department of Pathology, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Wilayah Persekutuan, Malaysia
| | - Nor Rafeah Tumian
- Internal Medicine, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur, Wilayah Persekutuan, Malaysia
| | - Phang Kean-Chang
- Department of Pathology, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Wilayah Persekutuan, Malaysia
| | - Ghaleb Elyamany
- Department of Central Military Laboratory and Blood Bank, Prince Sultan Riyadh Military Medical City, Riyadh, Saudi Arabia
| | | | - Adnan Mansoor
- Pathology and Laboratory Medicine, University of Calgary, Calgary, Alberta, Canada
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17
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Roders N, Herr F, Ambroise G, Thaunat O, Portier A, Vazquez A, Durrbach A. SYK Inhibition Induces Apoptosis in Germinal Center-Like B Cells by Modulating the Antiapoptotic Protein Myeloid Cell Leukemia-1, Affecting B-Cell Activation and Antibody Production. Front Immunol 2018; 9:787. [PMID: 29740433 PMCID: PMC5928208 DOI: 10.3389/fimmu.2018.00787] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 03/29/2018] [Indexed: 12/24/2022] Open
Abstract
B cells play a major role in the antibody-mediated rejection (AMR) of solid organ transplants, a major public health concern. The germinal center (GC) is involved in the generation of donor-specific antibody-producing plasma cells and memory B cells, which are often poorly controlled by current treatments. Myeloid cell leukemia-1 (Mcl-1), an antiapoptotic member of the B-cell lymphoma-2 family, is essential for maintenance of the GC reaction and B-cell differentiation. During chronic AMR (cAMR), tertiary lymphoid structures resembling GCs appear in the rejected organ, suggesting local lymphoid neogenesis. We report the infiltration of the kidneys with B cells expressing Mcl-1 in patients with cAMR. We modulated GC viability by impairing B-cell receptor signaling, by spleen tyrosine kinase (SYK) inhibition. SYK inhibition lowers viability and Mcl-1 protein levels in Burkitt's lymphoma cell lines. This downregulation of Mcl-1 is coordinated at the transcriptional level, possibly by signal transducer and activator of transcription 3 (STAT3), as shown by (1) the impaired translocation of STAT3 to the nucleus following SYK inhibition, and (2) the lower levels of Mcl-1 transcription upon STAT3 inhibition. Mcl-1 overproduction prevented cells from entering apoptosis following SYK inhibition. In vitro studies with primary tonsillar B cells confirmed that SYK inhibition impaired cell survival and decreased Mcl-1 protein levels. It also impaired B-cell activation and immunoglobulin G secretion by tonsillar B cells. These findings suggest that the SYK-Mcl-1 pathway could be targeted, to improve graft survival by manipulating the humoral immune response.
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Affiliation(s)
- Nathalie Roders
- Institut Francilien de Recherche en Nephrologie et Transplantation (IFRNT), Service de Néphrologie, Hôpital Bicêtre, Le Kremlin Bicêtre, France.,INSERM UMRS-MD 1197, Villejuif, France.,Université Paris Sud, Orsay, France
| | - Florence Herr
- Institut Francilien de Recherche en Nephrologie et Transplantation (IFRNT), Service de Néphrologie, Hôpital Bicêtre, Le Kremlin Bicêtre, France.,INSERM UMRS-MD 1197, Villejuif, France.,Université Paris Sud, Orsay, France
| | | | - Olivier Thaunat
- French National Institute of Health and Medical Research (INSERM) Unit 1111, Lyon, France.,Department of Transplantation, Nephrology and Clinical Immunology, Edouard Herriot University Hospital, Lyon, France.,Claude Bernard University Lyon 1, Lyon, France
| | - Alain Portier
- INSERM UMRS-MD 1197, Villejuif, France.,Université Paris Sud, Orsay, France
| | - Aimé Vazquez
- INSERM UMRS-MD 1197, Villejuif, France.,Université Paris Sud, Orsay, France
| | - Antoine Durrbach
- Institut Francilien de Recherche en Nephrologie et Transplantation (IFRNT), Service de Néphrologie, Hôpital Bicêtre, Le Kremlin Bicêtre, France.,INSERM UMRS-MD 1197, Villejuif, France.,Université Paris Sud, Orsay, France
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18
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Cyclin-dependent kinase activity is required for type I interferon production. Proc Natl Acad Sci U S A 2018; 115:E2950-E2959. [PMID: 29507205 DOI: 10.1073/pnas.1720431115] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Recognition of nucleic acids results in the production of type I IFNs, which activate the JAK/STAT pathway and promote the expression of IFN-stimulated genes. In a search for modulators of this pathway, we discovered an unexpected requirement for cyclin-dependent kinases (CDK) in the production of type I IFN following nucleic acid sensing and virus infection. Inhibition of CDK activity or knockdown of CDK levels leads to a striking block in STAT activation and IFN-stimulated gene expression. CDKs are not required for the initial nucleic acid sensing leading to IFN-β mRNA induction, nor for the response to exogenous IFN-α/β, but are critical for IFN-β release into culture supernatants, suggesting a posttranscriptional role for CDKs in type I IFN production. In the absence of CDK activity, we demonstrate a translational block specific for IFN-β, in which IFN-β mRNA is removed from the actively translating polysomes, while the distribution of other cellular mRNAs or global translation rates are unaffected. Our findings reveal a critical role for CDKs in the translation of IFN-β.
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19
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Activation of STAT3 integrates common profibrotic pathways to promote fibroblast activation and tissue fibrosis. Nat Commun 2017; 8:1130. [PMID: 29066712 PMCID: PMC5654983 DOI: 10.1038/s41467-017-01236-6] [Citation(s) in RCA: 228] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 08/29/2017] [Indexed: 12/18/2022] Open
Abstract
Signal transducer and activator of transcription 3 (STAT3) is phosphorylated by various kinases, several of which have been implicated in aberrant fibroblast activation in fibrotic diseases including systemic sclerosis (SSc). Here we show that profibrotic signals converge on STAT3 and that STAT3 may be an important molecular checkpoint for tissue fibrosis. STAT3 signaling is hyperactivated in SSc in a TGFβ-dependent manner. Expression profiling and functional studies in vitro and in vivo demonstrate that STAT3 activation is mediated by the combined action of JAK, SRC, c-ABL, and JNK kinases. STAT3-deficient fibroblasts are less sensitive to the pro-fibrotic effects of TGFβ. Fibroblast-specific knockout of STAT3, or its pharmacological inhibition, ameliorate skin fibrosis in experimental mouse models. STAT3 thus integrates several profibrotic signals and might be a core mediator of fibrosis. Considering that several STAT3 inhibitors are currently tested in clinical trials, STAT3 might be a candidate for molecular targeted therapies of SSc. STAT3 is a transcription factor that is activated in fibrotic diseases such as systemic sclerosis. Here the authors show that STAT3 is the converging point for multiple pro-fibrotic signalling pathways, and that its genetic ablation or inhibition ameliorate skin fibrosis in mouse models.
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20
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Saba NS, Wong DH, Tanios G, Iyer JR, Lobelle-Rich P, Dadashian EL, Liu D, Fontan L, Flemington EK, Nichols CM, Underbayev C, Safah H, Melnick A, Wiestner A, Herman SEM. MALT1 Inhibition Is Efficacious in Both Naïve and Ibrutinib-Resistant Chronic Lymphocytic Leukemia. Cancer Res 2017; 77:7038-7048. [PMID: 28993409 DOI: 10.1158/0008-5472.can-17-2485] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 09/13/2017] [Accepted: 10/03/2017] [Indexed: 11/16/2022]
Abstract
The clinical efficacy displayed by ibrutinib in chronic lymphocytic leukemia (CLL) has been challenged by the frequent emergence of resistant clones. The ibrutinib target, Bruton's tyrosine kinase (BTK), is essential for B-cell receptor signaling, and most resistant cases carry mutations in BTK or PLCG2, a downstream effector target of BTK. Recent findings show that MI-2, a small molecule inhibitor of the para-caspase MALT1, is effective in preclinical models of another type of BCR pathway-dependent lymphoma. We therefore studied the activity of MI-2 against CLL and ibrutinib-resistant CLL. Treatment of CLL cells in vitro with MI-2 inhibited MALT1 proteolytic activity reduced BCR and NF-κB signaling, inhibited nuclear translocation of RelB and p50, and decreased Bcl-xL levels. MI-2 selectively induced dose and time-dependent apoptosis in CLL cells, sparing normal B lymphocytes. Furthermore, MI-2 abrogated survival signals provided by stromal cells and BCR cross-linking and was effective against CLL cells harboring features associated with poor outcomes, including 17p deletion and unmutated IGHV Notably, MI-2 was effective against CLL cells collected from patients harboring mutations conferring resistance to ibrutinib. Overall, our findings provide a preclinical rationale for the clinical development of MALT1 inhibitors in CLL, in particular for ibrutinib-resistant forms of this disease. Cancer Res; 77(24); 7038-48. ©2017 AACR.
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Affiliation(s)
- Nakhle S Saba
- Section of Hematology and Medical Oncology, Department of Medicine, Tulane University, New Orleans, Louisiana.
| | - Deanna H Wong
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Georges Tanios
- Section of Hematology and Medical Oncology, Department of Medicine, Tulane University, New Orleans, Louisiana
| | - Jessica R Iyer
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Patricia Lobelle-Rich
- Section of Hematology and Medical Oncology, Department of Medicine, Tulane University, New Orleans, Louisiana
| | - Eman L Dadashian
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Delong Liu
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Lorena Fontan
- Section of Hematology and Medical Oncology, Department of Medicine, Weill Cornell Medical College, New York, New York
| | | | - Cydney M Nichols
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Chingiz Underbayev
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Hana Safah
- Section of Hematology and Medical Oncology, Department of Medicine, Tulane University, New Orleans, Louisiana
| | - Ari Melnick
- Section of Hematology and Medical Oncology, Department of Medicine, Weill Cornell Medical College, New York, New York
| | - Adrian Wiestner
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Sarah E M Herman
- Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland.
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21
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Quan R, Zhu S, Wei L, Wang J, Yan X, Li Z, Liu J. Transcriptional profiles in bursal B-lymphoid DT40 cells infected with very virulent infectious bursal disease virus. Virol J 2017; 14:7. [PMID: 28086922 PMCID: PMC5237357 DOI: 10.1186/s12985-016-0668-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Accepted: 12/09/2016] [Indexed: 12/14/2022] Open
Abstract
Background Infectious bursal disease virus (IBDV) causes a highly contagious, immunosuppressive disease in chickens. The virus mainly infects immature B lymphocytes in the bursa of Fabricius (BF). Chicken B cell line DT40, an avian leukosis virus-induced B cell line, supports very virulent IBDV (vvIBDV) infection in vitro and thereby serves as a good model for investigating the infection and pathogenesis of this virus. However, a transcriptome-wide understanding of the interaction between vvIBDV and B cells has not yet been achieved. This study aimed to employ time-course DNA microarrays to investigate gene expression patterns in DT40 cells after infection with vvIBDV strain LX. Results DT40 cells infected with vvIBDV exhibited alterations in the expression of many important host genes involved in signal transduction pathways, including MAPK signaling, PI3K/mTOR signaling, cell death and survival, BCR signaling, and antigen presentation. The changes in cellular mRNA levels identified by microarray analysis were confirmed for 8 selected genes using real-time reverse transcription-PCR. The upregulation of inflammatory cytokines and Toll-like receptors (TLRs) in the bursa of vvIBDV-infected chickens might involve excessive activation of the innate immune and inflammatory responses and contribute to tissue damage. Conclusions The present study is the first to provide a comprehensive differential transcriptional profile of cultured DT40 cells in response to vvIBDV infection and further extends our understanding of the molecular mechanisms underlying vvIBDV infection and pathogenesis.
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Affiliation(s)
- Rong Quan
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China
| | - Shanshan Zhu
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China
| | - Li Wei
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China
| | - Jing Wang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China
| | - Xu Yan
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China
| | - Zixuan Li
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China
| | - Jue Liu
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, No. 9 Shuguang Garden Middle Road, Haidian District, Beijing, 100097, People's Republic of China.
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22
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Li R, Fang L, Pu Q, Lin P, Hoggarth A, Huang H, Li X, Li G, Wu M. Lyn prevents aberrant inflammatory responses to Pseudomonas infection in mammalian systems by repressing a SHIP-1-associated signaling cluster. Signal Transduct Target Ther 2016; 1:16032. [PMID: 29263906 PMCID: PMC5661651 DOI: 10.1038/sigtrans.2016.32] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 11/18/2016] [Accepted: 11/22/2016] [Indexed: 02/05/2023] Open
Abstract
The pleiotropic Src kinase Lyn has critical roles in host defense in alveolar macrophages against bacterial infection, but the underlying mechanism for Lyn-mediated inflammatory response remains largely elusive. Using mouse Pseudomonas aeruginosa infection models, we observed that Lyn-/- mice manifest severe lung injury and enhanced inflammatory responses, compared with wild-type littermates. We demonstrate that Lyn exerts this immune function through interaction with IL-6 receptor and cytoskeletal protein Ezrin via its SH2 and SH3 domains. Depletion of Lyn results in excessive STAT3 activation, and enhanced the Src homology 2-containing inositol-5-phopsphatase 1 (SHIP-1) expression. Deletion of SHIP-1 in Lyn-/- mice (double knockout) promotes mouse survival and reduces inflammatory responses during P. aeruginosa infection, revealing the rescue of the deadly infectious phenotype in Lyn deficiency. Mechanistically, loss of SHIP-1 reduces NF-κB-dependent cytokine production and dampens MAP kinase activation through a TLR4-independent PI3K/Akt pathway. These findings reveal Lyn as a regulator for host immune response against P. aeruginosa infection through SHIP-1 and IL-6/STAT3 signaling pathway in alveolar macrophages.
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Affiliation(s)
- Rongpeng Li
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA.,Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P.R., China
| | - Lizhu Fang
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA
| | - Qinqin Pu
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA.,State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, China
| | - Ping Lin
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA
| | - Austin Hoggarth
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA
| | - Huang Huang
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA
| | - Xuefeng Li
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA.,Institute of Human Virology, Sun Yat-sen University, Guangzhou, China
| | - Guoping Li
- Inflammation and Allergic Disease Research Unit, First Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Min Wu
- Department of Biomedical Sciences, University of North Dakota, Grand Forks, North Dakota, USA.,State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, China
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23
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Sakaguchi N, Maeda K. Germinal Center B-Cell-Associated Nuclear Protein (GANP) Involved in RNA Metabolism for B Cell Maturation. Adv Immunol 2016; 131:135-86. [PMID: 27235683 DOI: 10.1016/bs.ai.2016.02.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Germinal center B-cell-associated nuclear protein (GANP) is upregulated in germinal center B cells against T-cell-dependent antigens in mice and humans. In mice, GANP depletion in B cells impairs antibody affinity maturation. Conversely, its transgenic overexpression augments the generation of high-affinity antigen-specific B cells. GANP associates with AID in the cytoplasm, shepherds AID into the nucleus, and augments its access to the rearranged immunoglobulin (Ig) variable (V) region of the genome in B cells, thereby precipitating the somatic hypermutation of V region genes. GANP is also upregulated in human CD4(+) T cells and is associated with APOBEC3G (A3G). GANP interacts with A3G and escorts it to the virion cores to potentiate its antiretroviral activity by inactivating HIV-1 genomic cDNA. Thus, GANP is characterized as a cofactor associated with AID/APOBEC cytidine deaminase family molecules in generating diversity of the IgV region of the genome and genetic alterations of exogenously introduced viral targets. GANP, encoded by human chromosome 21, as well as its mouse equivalent on chromosome 10, contains a region homologous to Saccharomyces Sac3 that was characterized as a component of the transcription/export 2 (TREX-2) complex and was predicted to be involved in RNA export and metabolism in mammalian cells. The metabolism of RNA during its maturation, from the transcription site at the chromosome within the nucleus to the cytoplasmic translation apparatus, needs to be elaborated with regard to acquired and innate immunity. In this review, we summarize the current knowledge on GANP as a component of TREX-2 in mammalian cells.
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Affiliation(s)
- N Sakaguchi
- WPI Immunology Frontier Research Center (IFReC), Osaka University, Suita, Osaka, Japan; Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan.
| | - K Maeda
- WPI Immunology Frontier Research Center (IFReC), Osaka University, Suita, Osaka, Japan; Laboratory of Host Defense, Research Institute for Microbial Diseases, Osaka University, Suita, Japan
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24
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Yoshimoto N, Ikeda Y, Tatematsu K, Iijima M, Nakai T, Okajima T, Tanizawa K, Kuroda S. Cytokine-dependent activation of JAK-STAT pathway in Saccharomyces cerevisiae. Biotechnol Bioeng 2016; 113:1796-804. [PMID: 26853220 DOI: 10.1002/bit.25948] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 12/28/2015] [Accepted: 02/03/2016] [Indexed: 01/28/2023]
Abstract
Protein phosphorylation is an important post-translational modification for intracellular signaling molecules, mostly found in serine and threonine residues. Tyrosine phosphorylations are very few events (less than 0.1% to phosphorylated serine/threonine residues), but capable of governing cell fate decisions involved in proliferation, differentiation, apoptosis, and oncogenic transformation. Hence, it is important for drug discovery and system biology to measure the intracellular level of phosphotyrosine. Although mammalian cells have been conventionally utilized for this purpose, accurate determination of phosphotyrosine level often suffers from high background due to the unexpected crosstalk among endogenous signaling molecules. This situation led us firstly to establish the ligand-induced activation of homomeric receptor tyrosine kinase (i.e., epidermal growth factor receptor) in Saccharomyces cerevisiae, a lower eukaryote possessing organelles similar to higher eukaryote but not showing substantial level of tyrosine kinase activity. In this study, we expressed heteromeric receptor tyrosine kinase (i.e., a complex of interleukin-5 receptor (IL5R) α chain, common β chain, and JAK2 tyrosine kinase) in yeast. When coexpressed with a cell wall-anchored form of IL5, the yeast exerted the autophosphorylation of JAK2, followed by the phosphorylation of transcription factor STAT5a and subsequent nuclear accumulation of phosphorylated STAT5a. Taken together, yeast could be an ideal host for sensitive detection of phosphotyrosine generated by a wide variety of tyrosine kinases. Biotechnol. Bioeng. 2016;113: 1796-1804. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Nobuo Yoshimoto
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Yuko Ikeda
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Kenji Tatematsu
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Masumi Iijima
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Tadashi Nakai
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Toshihide Okajima
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Katsuyuki Tanizawa
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Shun'ichi Kuroda
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.
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25
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Lutz J, Dittmann K, Bösl MR, Winkler TH, Wienands J, Engels N. Reactivation of IgG-switched memory B cells by BCR-intrinsic signal amplification promotes IgG antibody production. Nat Commun 2015; 6:8575. [PMID: 26815242 PMCID: PMC4633962 DOI: 10.1038/ncomms9575] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 09/05/2015] [Indexed: 01/26/2023] Open
Abstract
Secondary antibody responses are marked by faster kinetics, improved antibody affinity and a switch from IgM to other immunoglobulin isotypes, most notably IgG, compared with primary responses. These changes protect from reinfection and represent the principle of most vaccination strategies. Yet, the molecular mechanisms that underlie B-cell memory responses are unclear. Here we show, by inactivating the immunoglobulin tail tyrosine (ITT) signalling motif of membrane-bound IgG1 in the mouse, that the ITT facilitates maintenance and reactivation of IgG-switched memory B cells in vivo. The ITT motif equips IgG-switched cells with enhanced BCR signalling capacity, which supports their competitiveness in secondary immune reactions and drives the formation of IgG-secreting plasma cells even in the absence of T-cell help. Our results demonstrate that ITT signalling promotes the vigorous production of IgG antibodies and thus provide a molecular basis for humoral immunological memory.
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Affiliation(s)
- Johannes Lutz
- Institute of Cellular and Molecular Immunology, Georg-August-University of Göttingen, Medical Faculty, Humboldtallee 34, 37073 Göttingen, Germany
| | - Kai Dittmann
- Institute of Cellular and Molecular Immunology, Georg-August-University of Göttingen, Medical Faculty, Humboldtallee 34, 37073 Göttingen, Germany
| | - Michael R Bösl
- Max Planck Institute of Neurobiology, Transgenic Core Facility, 82152 Martinsried, Germany
| | - Thomas H Winkler
- Hematopoiesis Unit, Department of Biology, Nikolaus-Fiebiger-Center for Molecular Medicine, Friedrich-Alexander-University Erlangen-Nürnberg, Glückstrasse 6, 91054 Erlangen, Germany
| | - Jürgen Wienands
- Institute of Cellular and Molecular Immunology, Georg-August-University of Göttingen, Medical Faculty, Humboldtallee 34, 37073 Göttingen, Germany
| | - Niklas Engels
- Institute of Cellular and Molecular Immunology, Georg-August-University of Göttingen, Medical Faculty, Humboldtallee 34, 37073 Göttingen, Germany
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26
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Shao WH, Gamero AM, Zhen Y, Lobue MJ, Priest SO, Albandar HJ, Cohen PL. Stat1 Regulates Lupus-like Chronic Graft-versus-Host Disease Severity via Interactions with Stat3. THE JOURNAL OF IMMUNOLOGY 2015; 195:4136-43. [PMID: 26392462 DOI: 10.4049/jimmunol.1501353] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 08/24/2015] [Indexed: 11/19/2022]
Abstract
Systemic lupus erythematosus (SLE) is a complex multisystem autoimmune disease, characterized by a spectrum of autoantibodies that target multiple cellular components. Glomerulonephritis is a major cause of morbidity in patients with SLE. Little is known about the pathogenesis of SLE renal damage and compromised renal function. Activation of both Stat1 and Stat3 has been reported in lupus and lupus nephritis. The reciprocal activation of these two transcription factors may have a major impact on renal inflammation. To study the role of Stat1 in a lupus model, we induced lupus-like chronic graft-versus-host disease (cGVHD) in Stat1-knockout (KO) and wild-type (WT) mice by i.p. injection of class II-disparate bm12 splenocytes. WT recipients of these alloreactive cells developed anti-dsDNA autoantibodies starting at week 2 as expected, with a decline after week 4. In contrast, Stat1-KO hosts exhibited a prolonged and significant increase of anti-dsDNA autoantibody responses compared with WT mice (week 4 to week 8). Increased autoantibody titers were accompanied by increased proteinuria and mortality in the cGVHD host mice lacking Stat1. Further analysis revealed expression and activation of Stat3 in the glomeruli of Stat1-KO host mice but not WT mice with cGVHD. Glomerular Stat3 activity in the Stat1-KO mice was associated with increased IL-6 and IFN-γ secretion and macrophage infiltration. Interactions between Stat1 and Stat3 thus appear to be crucial in determining the severity of lupus-like disease in the cGVHD model.
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Affiliation(s)
- Wen-Hai Shao
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140; and
| | - Ana M Gamero
- Department of Medical Genetics and Molecular Biochemistry, Temple University, Philadelphia, PA 19140
| | - Yuxuan Zhen
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140; and
| | - Monica J Lobue
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140; and
| | - Stephen O Priest
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140; and
| | - Hazem J Albandar
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140; and
| | - Philip L Cohen
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140; and
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27
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Satpathy S, Wagner SA, Beli P, Gupta R, Kristiansen TA, Malinova D, Francavilla C, Tolar P, Bishop GA, Hostager BS, Choudhary C. Systems-wide analysis of BCR signalosomes and downstream phosphorylation and ubiquitylation. Mol Syst Biol 2015; 11:810. [PMID: 26038114 PMCID: PMC4501846 DOI: 10.15252/msb.20145880] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 04/30/2015] [Accepted: 05/06/2015] [Indexed: 12/02/2022] Open
Abstract
B-cell receptor (BCR) signaling is essential for the development and function of B cells; however, the spectrum of proteins involved in BCR signaling is not fully known. Here we used quantitative mass spectrometry-based proteomics to monitor the dynamics of BCR signaling complexes (signalosomes) and to investigate the dynamics of downstream phosphorylation and ubiquitylation signaling. We identify most of the previously known components of BCR signaling, as well as many proteins that have not yet been implicated in this system. BCR activation leads to rapid tyrosine phosphorylation and ubiquitylation of the receptor-proximal signaling components, many of which are co-regulated by both the modifications. We illustrate the power of multilayered proteomic analyses for discovering novel BCR signaling components by demonstrating that BCR-induced phosphorylation of RAB7A at S72 prevents its association with effector proteins and with endo-lysosomal compartments. In addition, we show that BCL10 is modified by LUBAC-mediated linear ubiquitylation, and demonstrate an important function of LUBAC in BCR-induced NF-κB signaling. Our results offer a global and integrated view of BCR signaling, and the provided datasets can serve as a valuable resource for further understanding BCR signaling networks.
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Affiliation(s)
- Shankha Satpathy
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Sebastian A Wagner
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Petra Beli
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Rajat Gupta
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Trine A Kristiansen
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Dessislava Malinova
- Division of Immune Cell Biology, MRC National Institute for Medical Research, Mill Hill, London, UK
| | - Chiara Francavilla
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Pavel Tolar
- Division of Immune Cell Biology, MRC National Institute for Medical Research, Mill Hill, London, UK
| | - Gail A Bishop
- Department of Microbiology, Graduate Program in Immunology and Department of Internal Medicine, University of Iowa, Iowa City, IA, USA VAMC, Iowa City, IA, USA
| | - Bruce S Hostager
- Department of Pediatrics, University of Iowa, Iowa City, IA, USA
| | - Chunaram Choudhary
- Department of Proteomics, The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Stimulation of the B-cell receptor activates the JAK2/STAT3 signaling pathway in chronic lymphocytic leukemia cells. Blood 2014; 123:3797-802. [PMID: 24778152 DOI: 10.1182/blood-2013-10-534073] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In chronic lymphocytic leukemia (CLL), stimulation of the B-cell receptor (BCR) triggers survival signals. Because in various cells activation of the Janus kinase (JAK)/signal transducer and activator of transcription (STAT) pathway provides cells with survival advantage, we wondered whether BCR stimulation activates the JAK/STAT pathway in CLL cells. To stimulate the BCR we incubated CLL cells with anti-IgM antibodies. Anti-IgM antibodies induced transient tyrosine phosphorylation and nuclear localization of phosphorylated (p) STAT3. Immunoprecipitation studies revealed that anti-JAK2 antibodies coimmunoprecipitated pSTAT3 and pJAK2 in IgM-stimulated but not unstimulated CLL cells, suggesting that activation of the BCR induces activation of JAK2, which phosphorylates STAT3. Incubation of CLL cells with the JAK1/2 inhibitor ruxolitinib inhibited IgM-induced STAT3 phosphorylation and induced apoptosis of IgM-stimulated but not unstimulated CLL cells in a dose- and time-dependent manner. Whether ruxolitinib treatment would benefit patients with CLL remains to be determined.
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29
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Lyn kinase plays important roles in erythroid expansion, maturation and erythropoietin receptor signalling by regulating inhibitory signalling pathways that control survival. Biochem J 2014; 459:455-66. [DOI: 10.1042/bj20130903] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
In erythroid cells both positive viability signals and feedback inhibitory signalling require the Src family kinase Lyn, influencing cell survival and their ability to differentiate. This illustrates that Lyn is critical for normal erythropoiesis and erythroid cell development.
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30
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Moens L, Tangye SG. Cytokine-Mediated Regulation of Plasma Cell Generation: IL-21 Takes Center Stage. Front Immunol 2014; 5:65. [PMID: 24600453 PMCID: PMC3927127 DOI: 10.3389/fimmu.2014.00065] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 02/05/2014] [Indexed: 11/20/2022] Open
Abstract
During our life, we are surrounded by continuous threats from a diverse range of invading pathogens. Our immune system has evolved multiple mechanisms to efficiently deal with these threats so as to prevent them from causing disease. Terminal differentiation of mature B cells into plasma cells (PC) – the antibody (Ab) secreting cells of the immune system – is critical for the generation of protective and long-lived humoral immune responses. Indeed, efficient production of antigen (Ag)-specific Ab by activated B cells underlies the success of most currently available vaccines. The mature B-cell pool is composed of several subsets, distinguished from one according to size, surface marker expression, location, and Ag exposure, and they all have the capacity to differentiate into PCs. For a B-cell to acquire the capacity to produce Abs, it must undergo an extensive differentiation process driven by changes in gene expression. Two broad categories of Ags exist that cause B-cell activation and differentiation: T cell dependent (TD) or T cell independent (TI). In addition to the B-cell subset and nature of the Ag, it is important to consider the cytokine environment that can also influence how B-cell differentiation is achieved. Thus, while many cytokines can induce Ab-secretion by B cells after activation with mimics of TD and TI stimuli in vitro, they can have different efficacies and specificities, and can often preferentially induce production of one particular Ig isotype over another. Here, we will provide an overview of in vitro studies (mouse and human origin) that evaluated the role of different cytokines in inducing the differentiation of distinct B-cell subsets to the PC lineage. We will place particular emphasis on IL-21, which has emerged as the most potent inducer of terminal B-cell differentiation in humans. We will also focus on the role of IL-21 and defects in B-cell function and how these contribute to human immunopathologies such as primary immunodeficiencies and B-cell mediated autoimmune conditions.
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Affiliation(s)
- Leen Moens
- Immunology and Immunodeficiency Group, Immunology Research Program, Garvan Institute of Medical Research , Darlinghurst, NSW , Australia
| | - Stuart G Tangye
- Immunology and Immunodeficiency Group, Immunology Research Program, Garvan Institute of Medical Research , Darlinghurst, NSW , Australia ; St Vincent's Clinical School, University of New South Wales , Darlinghurst, NSW , Australia
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31
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Yue H, Tanaka K, Furukawa T, Karnik SS, Li W. Thymidine phosphorylase inhibits vascular smooth muscle cell proliferation via upregulation of STAT3. BIOCHIMICA ET BIOPHYSICA ACTA 2012; 1823:1316-23. [PMID: 22668509 PMCID: PMC4133185 DOI: 10.1016/j.bbamcr.2012.05.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 04/20/2012] [Accepted: 05/25/2012] [Indexed: 11/22/2022]
Abstract
Dysregulated growth and motility of vascular smooth muscle cells (VSMC) play important role in obstructive vascular diseases. We previously reported that gene transfer of thymidine phosphorylase (TP) into rat VSMC inhibits cell proliferation and attenuates balloon injury induced neointimal hyperplasia; however, the mechanism remains unclear. The current study identified a signaling pathway that mediates effect of TP inhibited VSMC proliferation with a TP activity-dependent manner. Rat VSMC overexpressing human TP gene (C2) or control empty vector (PC) were used. Serum stimulation induced constitutive STAT3 phosphorylation at tyrosine705 in C2 cell but not in PC, which was independent of JAK2 signaling pathway. Inhibition of Src family kinases activity inhibited STAT3 phosphorylation in C2 cells. Lyn activity was higher in C2 cell than in PC. SiRNA based gene knockdown of Lyn significantly decreased serum induced STAT3 phosphorylation in C2 and dramatically increased proliferation of this cell, suggesting that Lyn plays a pivotal role in TP inhibited VSMC proliferation. Unphosphorylated STAT3 (U-STAT3) expression was significantly increased in C2 cells, which may be due to the increased STAT3 transcription. Gene transfection of mouse wild-type or Y705F mutant STAT3 into PC cell or mouse primary cultured VSMC significantly reduced proliferation of these cells, suggesting that overexpression of U-STAT3 inhibits VSMC proliferation. We conclude that Lyn mediates TP induced STAT3 activation, which subsequently contributes to upregulate expression of U-STAT3. The U-STAT3 plays a critical role in inhibiting VSMC proliferation.
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Affiliation(s)
- Hong Yue
- Department of Molecular Cardiology, Lerner Research Institute, The Cleveland Clinic, Ohio USA
| | - Kuniyoshi Tanaka
- Second Department of Surgery, Faculty of Medical Sciences, University of Fukui, Fukui Japan
| | - Tatsuhiko Furukawa
- Department of Molecular Oncology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima Japan
| | - Sadashiva S. Karnik
- Department of Molecular Cardiology, Lerner Research Institute, The Cleveland Clinic, Ohio USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Ohio, USA
| | - Wei Li
- Second Department of Surgery, Faculty of Medical Sciences, University of Fukui, Fukui Japan
- Department of Cell Biology, Lerner Research Institute, The Cleveland Clinic, Ohio USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Ohio, USA
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Song D, He Z, Wang C, Yuan F, Dong P, Zhang W. Regulation of the exopolysaccharide from an anamorph of Cordyceps sinensis on dendritic cell sarcoma (DCS) cell line. Eur J Nutr 2012; 52:687-94. [PMID: 22610670 DOI: 10.1007/s00394-012-0373-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Accepted: 04/30/2012] [Indexed: 12/17/2022]
Abstract
PURPOSE Cordyceps sinensis has been regarded as a precious tonic food and herbal medicine in China for thousands of years. The exopolysaccharide (EPS) from an anamorph of Cordyceps sinensis was found to have antitumor immunomodulatory activity. Mature dendritic cells play a role in initiating antitumor immunity, so we try to investigate the effects of EPS on the murine dendritic cell line DCS. METHODS Flow cytometry was used to assay the expression levels of cell surface molecules including major histocompatibility complex (MHC)-II, CD40, CD80, and CD86 of DCS cells and their ability to take up antigens. The ability of DCS cells to activate the proliferation of CTLL-2 T cells was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) method. IL-12 and TNF-α levels were detected using ELISA. Western blotting was performed to estimate the levels of phosphorylated Janus kinase 2 (p-JAK2), phosphorylated signal transducer and activator of transcription 3 (p-STAT3), nuclear factor-κB (NF-κB) p65 and p105. RESULTS EPS increased the expressions of MHC-II, CD40, CD80, and CD86 of DCS cells and up-regulated their ability to take up antigens. EPS also enhanced their ability to activate the proliferation of CTLL-2 T cells. IL-12 and TNF-α secreted from DCS cells were up-regulated after EPS treatment. Furthermore, EPS significantly caused the decline of p-JAK2 and p-STAT3, significantly increased levels of NF-κB p65 in the nucleus and decreased levels of NF-κB p105 in the cytoplasm. CONCLUSIONS EPS may induce DCS cells to exhibit mature characteristics, and the mechanism involved is probably related to the inhibition of the JAK2/STAT3 signal pathway and promotion of the NF-κB signal pathway.
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Affiliation(s)
- Dan Song
- Jiangsu Key Laboratory of Molecular Medicine, Medical School and State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, People's Republic of China
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33
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Yuan K, Huang C, Fox J, Gaid M, Weaver A, Li G, Singh BB, Gao H, Wu M. Elevated inflammatory response in caveolin-1-deficient mice with Pseudomonas aeruginosa infection is mediated by STAT3 protein and nuclear factor kappaB (NF-kappaB). J Biol Chem 2011; 286:21814-25. [PMID: 21515682 DOI: 10.1074/jbc.m111.237628] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Caveolin-1 (Cav-1), an important composition protein within the flask-shaped membrane invaginations termed caveolae, may play a role in host defense against infections. However, the phenotype in Pseudomonas aeruginosa-infected cav1 knock-out (KO) mice is still unresolved, and the mechanism involved is almost entirely unknown. Using a respiratory infection model, we confirmed a crucial role played by Cav-1 in host defense against this pathogen because Cav-1 KO mice showed increased mortality, severe lung injury, and systemic dissemination as compared with wild-type (WT) littermates. In addition, cav1 KO mice exhibited elevated inflammatory cytokines (IL-6, TNF-α, and IL-12a), decreased phagocytic ability of macrophages, and increased superoxide release in the lung, liver, and kidney. We further studied relevant cellular signaling processes and found that STAT3 and NF-κB are markedly activated. Our data revealed that the Cav-1/STAT3/NF-κB axis is responsible for a dysregulated cytokine response, which contributes to increased mortality and disease progression. Moreover, down-regulating Cav-1 in cell culture with a dominant negative strategy demonstrated that STAT3 activation was essential for the translocation of NF-κB into the nucleus, confirming the observations from cav1 KO mice. Collectively, our studies indicate that Cav-1 is critical for inflammatory responses regulating the STAT3/NF-κB pathway and thereby impacting P. aeruginosa infection.
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Affiliation(s)
- Kefei Yuan
- State Key Laboratory for Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China
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Baran-Marszak F, Boukhiar M, Harel S, Laguillier C, Roger C, Gressin R, Martin A, Fagard R, Varin-Blank N, Ajchenbaum-Cymbalista F, Ledoux D. Constitutive and B-cell receptor-induced activation of STAT3 are important signaling pathways targeted by bortezomib in leukemic mantle cell lymphoma. Haematologica 2010; 95:1865-72. [PMID: 20663948 DOI: 10.3324/haematol.2009.019745] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND The deregulation of several transcription factors contribute to the aggressive course of mantle cell lymphoma. This study focuses on survival signals emanating from the tumor environment and involving the signal transducer and activator of transcription (STAT) 3 through cytokines or antigen recognition. DESIGN AND METHODS Primary mantle cell lymphoma cells were isolated from 20 leukemic patients. The phosphorylation status of STAT3 was evaluated by immunoblottting and immunofluorescence, the levels of cytokine secretion by enzyme-linked immunosorbent assay and the cell survival signals by apoptosis and cell viability assays. RESULTS STAT3 was constitutively phosphorylated in the Jeko-1 mantle cell lymphoma cell line and in 14 out of 20 (70%) cases of leukemic mantle cell lymphoma as the result of an autocrine secretion of interleukin-6 and/or interleukin-10. In addition, B-cell receptor engagement resulted in an increase of both in vitro cell survival and STAT3 phosphorylation in primary mantle cell lymphoma cells. Inhibition of the Janus-activated kinase/STAT3 pathway increased spontaneous apoptosis and suppressed B-cell receptor-induced cell survival in all cases analyzed. The impact of in vitro exposure to the proteasome inhibitor bortezomib was next evaluated in primary mantle cell lymphoma cells. Bortezomib induced apoptosis and a decrease of both interleukin-6/interleukin-10 secretion and STAT3 phosphorylation. In addition, bortezomib inhibited B-cell receptor-triggered STAT3 phosphorylation and cell survival. CONCLUSIONS We demonstrated that STAT3 was activated in primary mantle cell lymphoma cells either constitutively through a cytokine autocrine loop or in response to B-cell receptor engagement, both processes leading to a survival signal inhibited by bortezomib. STAT3 appears, therefore, to play a pivotal role in mantle cell lymphoma and represents a promising therapeutic target.
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35
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Ruela-de-Sousa RR, Queiroz KCS, Peppelenbosch MP, Fuhler GM. Reversible phosphorylation in haematological malignancies: potential role for protein tyrosine phosphatases in treatment? Biochim Biophys Acta Rev Cancer 2010; 1806:287-303. [PMID: 20659529 DOI: 10.1016/j.bbcan.2010.07.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 07/16/2010] [Accepted: 07/20/2010] [Indexed: 01/12/2023]
Abstract
Most aspects of leukocyte physiology are under the control of reversible tyrosine phosphorylation. It is clear that excessive phosphorylation of signal transduction elements is a pivotal element of many different pathologies including haematological malignancies and accordingly, strategies that target such phosphorylation have clinically been proven highly successful for treatment of multiple types of leukemias and lymphomas. Cellular phosphorylation status is dependent on the resultant activity of kinases and phosphatases. The cell biology of the former is now well understood; for most cellular phosphoproteins we now know the kinases responsible for their phosphorylation and we understand the principles of their aberrant activity in disease. With respect to phosphatases, however, our knowledge is much patchier. Although the sequences of whole genomes allow us to identify phosphatases using in silico methodology, whereas transcription profiling allows us to understand how phosphatase expression is regulated during disease, most functional questions as to substrate specificity, dynamic regulation of phosphatase activity and potential for therapeutic intervention are still to a large degree open. Nevertheless, recent studies have allowed us to make meaningful statements on the role of tyrosine phosphatase activity in the three major signaling pathways that are commonly affected in leukemias, i.e. the Ras-Raf-ERK1/2, the Jak-STAT and the PI3K-PKB-mTOR pathways. Lessons learned from these pathways may well be applicable elsewhere in leukocyte biology as well.
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Affiliation(s)
- Roberta R Ruela-de-Sousa
- Center for Experimental and Molecular Medicine, Academic Medical Center, Meibergdreef 9 1105 AZ Amsterdam, The Netherlands
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36
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STAT3 is a substrate of SYK tyrosine kinase in B-lineage leukemia/lymphoma cells exposed to oxidative stress. Proc Natl Acad Sci U S A 2010; 107:2902-7. [PMID: 20133729 DOI: 10.1073/pnas.0909086107] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
We provide unprecedented genetic and biochemical evidence that the antiapoptotic transcription factor STAT3 serves as a substrate for SYK tyrosine kinase both in vitro and in vivo. Induction of SYK in an ecdysone-inducible mammalian expression system results in STAT3 activation, as documented by tyrosine phosphorylation and nuclear translocation of STAT3, as well as amplified expression of several STAT3 target genes. STAT3 activation after oxidative stress (OS) is strongly diminished in DT40 chicken B-lineage lymphoma cells rendered SYK-deficient by targeted disruption of the syk gene. Introduction of a wild-type, C-terminal or N-terminal SH2 domain-mutated, but not a kinase domain-mutated, syk gene into SYK-deficient DT40 cells restores OS-induced enhancement of STAT-3 activity. Thus, SYK plays an important and indispensable role in OS-induced STAT3 activation and its catalytic SH1 domain is critical for this previously unknown regulatory function. These results provide evidence for the existence of a novel mode of cytokine-independent cross-talk that operates between SYK and STAT3 pathways and regulates apoptosis during OS. We further provide experimental evidence that SYK is capable of associating with and phosphorylating STAT3 in human B-lineage leukemia/lymphoma cells challenged with OS. In agreement with a prerequisite role of SYK in OS-induced STAT3 activation, OS does not induce tyrosine phosphorylation of STAT3 in SYK-deficient human proB leukemia cells. Notably, inhibition of SYK with a small molecule drug candidate prevents OS-induced activation of STAT3 and overcomes the resistance of human B-lineage leukemia/lymphoma cells to OS-induced apoptosis.
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37
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The caspase-cleaved form of LYN mediates a psoriasis-like inflammatory syndrome in mice. EMBO J 2009; 28:2449-60. [PMID: 19590497 DOI: 10.1038/emboj.2009.183] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2008] [Accepted: 06/05/2009] [Indexed: 12/26/2022] Open
Abstract
We showed previously that Lyn is a substrate for caspases, a family of cysteine proteases, involved in the regulation of apoptosis and inflammation. Here, we report that expression of the caspase-cleaved form of Lyn (LynDeltaN), in mice, mediates a chronic inflammatory syndrome resembling human psoriasis. Genetic ablation of TNF receptor 1 in a LynDeltaN background rescues a normal phenotype, indicating that LynDeltaN mice phenotype is TNF-alpha-dependent. The predominant role of T cells in the disease occurring in LynDeltaN mice was highlighted by the distinct improvement of LynDeltaN mice phenotype in a Rag1-deficient background. Using pan-genomic profiling, we also established that LynDeltaN mice show an increased expression of STAT-3 and inhibitory members of the NFkappaB pathway. Accordingly, LynDeltaN alters NFkappaB activity underlying a link between inhibition of NFkappaB and LynDeltaN mice phenotype. Finally, analysis of Lyn expression in human skin biopsies of psoriatic patients led to the detection of Lyn cleavage product whose expression correlates with the activation of caspase 1. Our data identify a new role for Lyn as a regulator of psoriasis through its cleavage by caspases.
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Sharma S, Orlowski G, Song W. Btk regulates B cell receptor-mediated antigen processing and presentation by controlling actin cytoskeleton dynamics in B cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 182:329-39. [PMID: 19109164 PMCID: PMC2855895 DOI: 10.4049/jimmunol.182.1.329] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The high efficiency of Ag processing and presentation by B cells requires Ag-induced BCR signaling and actin cytoskeleton reorganization, although the underlying mechanism for such requirements remains elusive. In this study, we identify Bruton's tyrosine kinase (Btk) as a linker connecting BCR signaling to actin dynamics and the Ag transport pathway. Using xid mice and a Btk inhibitor, we show that BCR engagement increases actin polymerization and Wiskott-Aldrich syndrome protein activation in a Btk-dependent manner. Concurrently, we observe Btk-dependent increases in the levels of phosphatidylinositide-4,5-bisphosphate and phosphorylated Vav upon BCR engagement. The rate of BCR internalization, its movement to late endosomes, and efficiency of BCR-mediated Ag processing and presentation are significantly reduced in both xid and Btk inhibitor-treated B cells. Thus, Btk regulates actin dynamics and Ag transport by activating Wiskott-Aldrich syndrome protein via Vav and phosphatidylinositides. This represents a novel mechanism by which BCR-mediated signaling regulates BCR-mediated Ag processing and presentation.
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Affiliation(s)
- Shruti Sharma
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742
| | - Gregory Orlowski
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742
| | - Wenxia Song
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742
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Kim BH, Yin CH, Guo Q, Bach EA, Lee H, Sandoval C, Jayabose S, Ulaczyk-Lesanko A, Hall DG, Baeg GH. A small-molecule compound identified through a cell-based screening inhibits JAK/STAT pathway signaling in human cancer cells. Mol Cancer Ther 2008; 7:2672-80. [PMID: 18790749 DOI: 10.1158/1535-7163.mct-08-0309] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Inappropriate activation of JAK/STAT signaling occurs with high frequency in human cancers and is associated with cancer cell survival and proliferation. Therefore, the development of pharmacologic STAT signaling inhibitors has therapeutic potential in the treatment of human cancers. Here, we report 2-[(3,5-bis-trifluoromethyl-phenyl)-hydroxy-methyl]-1-(4-nitro-phenylamino)-6-phenyl-1,2,4a,7a-tetrahydro-pyrrolo[3,4-b]-pyridine-5,7-dione (AUH-6-96) as a novel small-molecule inhibitor of JAK/STAT signaling that we initially identified through a cell-based high-throughput screening using cultured Drosophila cells. Treatment of Drosophila cells with AUH-6-96 resulted in a reduction of Unpaired-induced transcriptional activity and tyrosine phosphorylation of STAT92E, the sole Drosophila STAT homologue. In human cancer cell lines, AUH-6-96 inhibited both constitutive and interleukin-6-induced STAT3 phosphorylation. Specifically, in Hodgkin lymphoma L540 cells, treatment with AUH-6-96 resulted in reduced levels of tyrosine phosphorylated STAT3 and of the STAT3 downstream target gene SOCS3 in a dose- and time-dependent manner. In addition, AUH-6-96-treated L540 cells showed decreased expression of persistently activated JAK3, suggesting that AUH-6-96 inhibits the JAK/STAT pathway signaling in L540 cells by affecting JAK3 activity and subsequently blocking STAT3 signaling. Importantly, AUH-6-96 selectively affected cell viability only of cancer cells harboring aberrant JAK/STAT signaling. In support of the specificity of AUH-6-96 for inhibition of JAK/STAT signaling, treatment with AUH-6-96 decreased cancer cell survival by inducing programmed cell death by down-regulating the expression of STAT3 downstream target antiapoptotic genes, such as Bcl-xL. In summary, this study shows that AUH-6-96 is a novel small-molecule inhibitor of JAK/STAT signaling and may have therapeutic potential in the treatment of human cancers harboring aberrant JAK/STAT signaling.
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Affiliation(s)
- Byung Hak Kim
- Department of Pediatrics, Division of Hematology/Oncology, New York Medical College, Valhalla, NY 10595, USA
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Wang L, Xue J, Zadorozny EV, Robinson LJ. G-CSF stimulates Jak2-dependent Gab2 phosphorylation leading to Erk1/2 activation and cell proliferation. Cell Signal 2008; 20:1890-9. [PMID: 18644434 PMCID: PMC2788816 DOI: 10.1016/j.cellsig.2008.06.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2008] [Accepted: 06/27/2008] [Indexed: 01/17/2023]
Abstract
Granulocyte colony-stimulating factor (G-CSF), the major cytokine regulator of neutrophilic granulopoiesis, stimulates both the proliferation and differentiation of myeloid precursors. A variety of signaling proteins have been identified as mediators of G-CSF signaling, but understanding of their specific interactions and organization into signaling pathways for particular cellular effects is incomplete. The present study examined the role of the scaffolding protein Grb2-associated binding protein-2 (Gab2) in G-CSF signaling. We found that a chemical inhibitor of Janus kinases inhibited G-CSF-stimulated Gab2 phosphorylation. Transfection with Jak2 antisense and dominant negative constructs also inhibited Gab2 phosphorylation in response to G-CSF. In addition, G-CSF enhanced the association of Jak2 with Gab2. In vitro, activated Jak2 directly phosphorylated specific Gab2 tyrosine residues. Mutagenesis studies revealed that Gab2 tyrosine 643 (Y643) was a major target of Jak2 in vitro, and a key residue for Jak2-dependent phosphorylation in intact cells. Mutation of Gab2 Y643 inhibited G-CSF-stimulated Erk1/2 activation and Shp2 binding to Gab2. Loss of Y643 also inhibited Gab2-mediated G-CSF-stimulated cell proliferation. Together, these results identify a novel signaling pathway involving Jak2-dependent Gab2 phosphorylation leading to Erk1/2 activation and cell proliferation in response to G-CSF.
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Affiliation(s)
- Lin Wang
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA
| | - Jia Xue
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA
| | - Eva V. Zadorozny
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA
| | - Lisa J. Robinson
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA
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Diehl SA, Schmidlin H, Nagasawa M, van Haren SD, Kwakkenbos MJ, Yasuda E, Beaumont T, Scheeren FA, Spits H. STAT3-mediated up-regulation of BLIMP1 Is coordinated with BCL6 down-regulation to control human plasma cell differentiation. THE JOURNAL OF IMMUNOLOGY 2008; 180:4805-15. [PMID: 18354204 DOI: 10.4049/jimmunol.180.7.4805] [Citation(s) in RCA: 182] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
STAT family members have been implicated in regulating the balance between B cell lymphoma (BCL)6 and B lymphocyte induced maturation protein (BLIMP)1 to control plasma cell differentiation. We previously showed that STAT5 induces BCL6 to block plasma cell differentiation and extend the life span of human B cells. The heterogeneity in STAT activation by cytokines and their effects on B cell differentiation prompted us to investigate the effect of STAT3 activation in plasma cell differentiation. First stimulation with IL-21, which promotes plasma cell differentiation, induced robust and prolonged STAT3 activation in primary human B cells. We then investigated effects of direct STAT3 activation on regulation of plasma cell genes, cellular phenotype, and Ig production. Activation of a tamoxifen-regulated STAT3-estrogen receptor fusion protein triggered BLIMP1 mRNA and protein up-regulation, plasma cell phenotypic features, and Ig secretion. When STAT3 was activated by IL-21 in B cells ectopically expressing BCL6, BLIMP1 was up-regulated, but only partial plasma cell differentiation was achieved. Lastly, through coexpression of BCL6 and STAT3-ER, we verified that STAT3 activation functionally mimicked IL-21 treatment and that STAT3-mediated BLIMP1 up-regulation occurred despite high BCL6 expression levels indicating that BCL6 is not the dominant repressor of BLIMP1. Thus, up-regulation of BLIMP1 alone is not sufficient for differentiation of primary human B cells into plasma cells; concomitant down-regulation of BCL6 is absolutely required for completion of the plasma cell differentiation program.
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Affiliation(s)
- Sean A Diehl
- Department of Cell Biology and Histology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Goody RJ, Beckham JD, Rubtsova K, Tyler KL. JAK-STAT signaling pathways are activated in the brain following reovirus infection. J Neurovirol 2007; 13:373-83. [PMID: 17849321 PMCID: PMC2367059 DOI: 10.1080/13550280701344983] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Reovirus infection provides a classic experimental model system for studying the pathogenesis of viral infections of the central nervous system (CNS), with apoptosis acting as the major mechanism of cell death. The authors have examined the role of signal transducer and activator of transcription (STAT)1, a component of Janus-activated kinase (JAK)-STAT signaling, a pathway implicated in antiviral responses and pathways regulating apoptosis, following reovirus infection. Infection of primary cortical neuron cultures with reovirus serotype 3 strain Abney (T3A) resulted in phosphorylation of STAT1 at sites critical for transcriptional activity. Activated STAT1 was also detected in the brain of neonatal mice following T3A infection, with a nuclear pattern of expression in areas of virus-induced injury. Activation of STAT proteins is typically mediated by JAKs. The authors observed JAK2 phosphorylation (Tyr 1007/1008) in brain lysates from T3A-infected mice. Inhibition of JAK activity with the inhibitor AG-490 blocked reovirus-induced STAT1 activation in neuronal cultures, indicating reovirus-induced STAT activation is JAK dependent. Pretreatment of neuronal cultures with antibody raised against interferon (IFN)-alpha/betaR2 inhibited T3A-induced STAT1 phosphorylation, whereas neither IFN-gamma or IFN-gammaR2 antibody pretreatment had any effect on T3A-induced STAT1 phosphorylation. Mice lacking the STAT1 gene demonstrated increased susceptibility to reovirus infection, with increased mortality and higher viral titers in the brain compared to wild-type animals. The results demonstrate activation of a type I IFN-mediated, JAK-dependent STAT signaling pathway following reovirus infection and suggest that STAT1 is a key component of host defense mechanisms against reovirus infection in the brain.
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Affiliation(s)
- Robin J Goody
- Departments of Neurology, University of Colorado at Denver and Health Sciences Center, Denver, Colorado, USA
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Dillon M, Minear J, Johnson J, Lannutti BJ. Expression of the GPI-anchored receptor Prv-1 enhances thrombopoietin and IL-3-induced proliferation in hematopoietic cell lines. Leuk Res 2007; 32:811-9. [PMID: 17980909 DOI: 10.1016/j.leukres.2007.09.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Revised: 09/25/2007] [Accepted: 09/27/2007] [Indexed: 12/20/2022]
Abstract
Prv-1 is a hematopoietic cell surface receptor that has been shown to be overexpressed in patients diagnosed with polycythemia vera (PV) and essential thrombocythemia (ET), yet its cellular function remains unclear. In this study, we assessed the role of Prv-1 in thrombopoietin (Tpo)/Mpl signaling with the goal of identifying molecular mechanisms which augment Tpo-induced proliferation. By engineering the cytokine-dependent hematopoietic cell line BaF3 to express both Prv-1 and wild-type or mutant forms of Mpl, we were able to follow the time course of Tpo-dependent proliferation. We report that the overexpression of Prv-1 increased Tpo as well as IL-3-induced proliferation of BaF3/Mpl and BaF3 cells. Cells co-expressing Prv-1 and an Mpl receptor containing a Box 1 motif mutation, which fails to activate Jak2, was completely deficient in Tpo-dependent proliferation. In addition, BaF3 and BaF3/Prv-1 cells stimulated with IL-3 in the presence of the Jak2 inhibitor, AG490, abrogated the proliferative response, indicating that Prv-1 requires a functional Jak2 for its signaling activities. Western blot analysis showed an increase in Tpo and IL-3-induced Stat3 and Stat5 tyrosine phosphorylation in BaF3/Mpl and BaF3 cells expressing Prv-1. These results indicate a novel function for Prv-1 as a signaling molecule in cytokine signaling cascades and may lead to a greater understanding of the mechanism of overexpression of Prv-1 in myeloproliferative disorders.
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Affiliation(s)
- Megan Dillon
- Puget Sound Blood Center, Seattle, WA 98104, United States
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