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Nguyen HTT, Xu Z, Shi X, Liu S, Schulte ML, White GC, Ma YQ. Paxillin binding to the PH domain of kindlin-3 in platelets is required to support integrin αIIbβ3 outside-in signaling. J Thromb Haemost 2021; 19:3126-3138. [PMID: 34411430 PMCID: PMC9080902 DOI: 10.1111/jth.15505] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 08/05/2021] [Accepted: 08/18/2021] [Indexed: 12/11/2022]
Abstract
BACKGROUND Kindlin-3 is essential for supporting the bidirectional signaling of integrin αIIbβ3 in platelets by bridging the crosstalk between integrin αIIbβ3 and the cytoplasmic signaling adaptors. OBJECTIVE In this study, we identified a previously unrecognized paxillin binding site in the pleckstrin homology (PH) domain of kindlin-3 and verified its functional significance. METHODS Structure-based approaches were employed to identify the paxillin binding site in the PH domain of kindlin-3. In addition, the bidirectional signaling of integrin αIIbβ3 were evaluated in both human and mouse platelets. RESULTS In brief, we found that a β1-β2 loop in the PH domain of kindlin-3, an important part of the canonical membrane phospholipid binding pocket, was also involved in mediating paxillin interaction. Interestingly, the binding sites of paxillin and membrane phospholipids in the PH domain of kindlin-3 were mutually exclusive. Specific disruption of paxillin binding to the PH domain by point mutations inhibited platelet spreading on immobilized fibrinogen while having no inhibition on soluble fibrinogen binding to stimulated platelets. In addition, a membrane-permeable peptide derived from the β1-β2 loop in the PH domain of kindlin-3 was capable of inhibiting platelet spreading and clot retraction, but it had no effect on soluble fibrinogen binding to platelets and platelet aggregation. Treatment with this peptide significantly reduced thrombus formation in mice. CONCLUSION Taken together, these findings suggest that interaction between paxillin and the PH domain of kindlin-3 plays an important role in supporting integrin αIIbβ3 outside-in signaling in platelets, thus providing a novel antithrombotic target.
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Affiliation(s)
| | - Zhen Xu
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Xiaofeng Shi
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA
- The second Affiliated Hospital of Nanjing Medical University, Nanjing, China
- The Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Shuzhen Liu
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA
- The Affiliated Hospital of Qingdao University, Qingdao, China
| | | | - Gilbert C. White
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA
- Department of Biochemistry, Medical College of Milwaukee, Milwaukee, Wisconsin, USA
| | - Yan-Qing Ma
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
- Department of Biochemistry, Medical College of Milwaukee, Milwaukee, Wisconsin, USA
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Zhu W, Zheng Y, Yu M, Wei J, Zhang Y, Topchyan P, Nguyen C, Janecke R, Kreuziger LB, White GC, Hari P, Aster R, Cui W, Jobe S, Graham MB, Wang D, Wen R. SARS-CoV-2 receptor binding domain-specific antibodies activate platelets with features resembling the pathogenic antibodies in heparin-induced thrombocytopenia. Res Sq 2021:rs.3.rs-462080. [PMID: 34013243 PMCID: PMC8132233 DOI: 10.21203/rs.3.rs-462080/v1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Severe COVID-19 is associated with unprecedented thromboembolic complications. We found that hospitalized COVID-19 patients develop immunoglobulin Gs (IgGs) that recognize a complex consisting of platelet factor 4 and heparin similar to those developed in heparin-induced thrombocytopenia and thrombosis (HIT), however, independent of heparin exposure. These antibodies activate platelets in the presence of TLR9 stimuli, stimuli that are prominent in COVID-19. Strikingly, 4 out of 42 antibodies cloned from IgG1+ RBD-binding B cells could activate platelets. These antibodies possessed, in the heavy-chain complementarity-determining region 3, an RKH or Y5 motif that we recently described among platelet-activating antibodies cloned from HIT patients. RKH and Y5 motifs were prevalent among published RBD-specific antibodies, and 3 out of 6 such antibodies tested could activate platelets. Features of platelet activation by these antibodies resemble those by pathogenic HIT antibodies. B cells with an RKH or Y5 motif were robustly expanded in COVID-19 patients. Our study demonstrates that SARS-CoV-2 infection drives the development of a subset of RBD-specific antibodies that can activate platelets and have activation properties and structural features similar to those of the pathogenic HIT antibodies.
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Yan Y, Yang H, Hu X, Zhang Z, Ge S, Xu Z, Gao J, Liu J, White GC, Ma YQ. Kindlin-3 in platelets and myeloid cells differentially regulates deep vein thrombosis in mice. Aging (Albany NY) 2019; 11:6951-6959. [PMID: 31477636 PMCID: PMC6756892 DOI: 10.18632/aging.102229] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 08/16/2019] [Indexed: 04/15/2023]
Abstract
Platelets and myeloid cells cooperate to promote deep vein thrombosis (DVT). Here we evaluated the role of kindlin-3, a key integrin activator in these cells, in regulating stenosis-induced DVT in mice. DVT was significantly suppressed in mice that express a kindlin-3 mutant defective for integrin binding, showing that kindlin-3-mediated integrin signaling in blood cells is required for DVT. While platelet-specific deficiency of kindlin-3 in Kindlin-3fl/flPF4-Cre mice significantly suppressed DVT, deficiency of kindlin-3 specifically in myeloid cells in Kindlin-3fl/flLysM-Cre mice remarkably enhanced the early development of DVT, indicating that kindlin-3 in platelets and myeloid cells can play distinct roles in regulating DVT. Mechanistically, the levels of neutrophil extracellular traps (NETs) in plasma, a key DVT facilitator, were significantly elevated in Kindlin-3fl/flLysM-Cre mice upon the IVC stenosis; and treatment with either DNase I or PAD4 inhibitor could effectively compromise the enhancement of DVT in these mice, suggesting that kindlin-3 in neutrophils may affect DVT via restraining NET release. In addition, we found that the kindlin-3-integrin αIIbβ3 signaling in platelets was required to promote NET release. Together, our studies reveal that kindlin-3 in platelets and myeloid cells can differentially regulate DVT through orchestrating NET release, thus providing further mechanistic insights into DVT.
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Affiliation(s)
- Yanyan Yan
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Hongqin Yang
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Xiao Hu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Zeping Zhang
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Shushu Ge
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Zhen Xu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
- Blood Research Institute, Versiti, Milwaukee, WI 53213, USA
| | - Juan Gao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Junling Liu
- Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China
| | - Gilbert C. White
- Blood Research Institute, Versiti, Milwaukee, WI 53213, USA
- Department of Biochemistry, Medical College of Milwaukee, Milwaukee, WI 53226, USA
| | - Yan-Qing Ma
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
- Blood Research Institute, Versiti, Milwaukee, WI 53213, USA
- Department of Biochemistry, Medical College of Milwaukee, Milwaukee, WI 53226, USA
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4
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Gao J, Bao Y, Ge S, Sun P, Sun J, Liu J, Chen F, Han L, Cao Z, Qin J, White GC, Xu Z, Ma YQ. Sharpin suppresses β1-integrin activation by complexing with the β1 tail and kindlin-1. Cell Commun Signal 2019; 17:101. [PMID: 31429758 PMCID: PMC6700787 DOI: 10.1186/s12964-019-0407-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 07/28/2019] [Indexed: 12/30/2022] Open
Abstract
Background Previously sharpin has been identified as an endogenous inhibitor of β1-integrin activation by directly binding to a conserved region in the cytoplasmic tails (CTs) of the integrin β1-associated α subunits. Methods Here we employed biochemical approaches and cellular analyses to evaluate the function and molecular mechanism of the sharpin-kindlin-1 complex in regulating β1-integrin activation. Results In this study, we found that although the inhibition of sharpin on β1-integrin activation could be confirmed, sharpin had no apparent effect on integrin αIIbβ3 activation in CHO cell system. Notably, a direct interaction between sharpin and the integrin β1 CT was detected, while the interaction of sharpin with the integrin αIIb and the β3 CTs were substantially weaker. Importantly, sharpin was able to inhibit the talin head domain binding to the integrin β1 CT, which can mechanistically contribute to inhibiting β1-integrin activation. Interestingly, we also found that sharpin interacted with kindlin-1, and the interaction between sharpin and the integrin β1 CT was significantly enhanced when kindlin-1 was present. Consistently, we observed that instead of acting as an activator, kindlin-1 actually suppressed the talin head domain mediated β1-integrin activation, indicating that kindlin-1 may facilitate recruitment of sharpin to the integrin β1 CT. Conclusion Taken together, our findings suggest that sharpin may complex with both kindlin-1 and the integrin β1 CT to restrict the talin head domain binding, thus inhibiting β1-integrin activation.
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Affiliation(s)
- Juan Gao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Yun Bao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Shushu Ge
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Peisen Sun
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Jiaojiao Sun
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Jianmin Liu
- Department of Molecular Cardiology, Lerner Research Institute Cleveland Clinic, Cleveland, OH, USA
| | - Feng Chen
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Li Han
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Zhongyuan Cao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Jun Qin
- Department of Molecular Cardiology, Lerner Research Institute Cleveland Clinic, Cleveland, OH, USA
| | - Gilbert C White
- Blood Research Institute, Versiti, 8727 Watertown Plank Road, Milwaukee, WI, 53226, USA.,Department of Biochemistry, Medical College of Milwaukee, Milwaukee, WI, USA
| | - Zhen Xu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China. .,Blood Research Institute, Versiti, 8727 Watertown Plank Road, Milwaukee, WI, 53226, USA.
| | - Yan-Qing Ma
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China. .,Blood Research Institute, Versiti, 8727 Watertown Plank Road, Milwaukee, WI, 53226, USA. .,Department of Biochemistry, Medical College of Milwaukee, Milwaukee, WI, USA.
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Abstract
SummaryHeterogeneity in human fibrinogen was examined using an improved two-dimensional isoelectric focusing-SDS polyacrylamide gel electrophoretic procedure. Four different preparations of fibrinogen were compared: single donor fibrinogen prepared from plasma by precipitation with ammonium sulfate or by affinity chromatography on fibrin-monomer Sepharose, fraction I—4 prepared from Cohn fraction I paste, and Kabi grade L. The subunit Aα, Bβ, and γ chains in all preparations had marked charge heterogeneity. The three chains were clearly separated from each other and a range of isoelectric points for each chain could be assigned. Minor variations in the subunit heterogeneity of the different preparations were found. Intermediates in the transition from fibrinogen to crosslinked fibrin were also examined. A striking increase in the heterogeneity of the α chain was observed during crosslinking.
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Affiliation(s)
- N A Carrell
- The University of North Carolina School of Medicine, Depts. of Biochemistry, Pathology and Medicine, and Dental Research Center, Chapel Hill, NC, U.S.A
| | - J R Holahan
- The University of North Carolina School of Medicine, Depts. of Biochemistry, Pathology and Medicine, and Dental Research Center, Chapel Hill, NC, U.S.A
| | - G C White
- The University of North Carolina School of Medicine, Depts. of Biochemistry, Pathology and Medicine, and Dental Research Center, Chapel Hill, NC, U.S.A
| | - J McDonagh
- The University of North Carolina School of Medicine, Depts. of Biochemistry, Pathology and Medicine, and Dental Research Center, Chapel Hill, NC, U.S.A
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Affiliation(s)
- Gilbert C White
- Departments of Medicine and Pharmacology, Center for Thrombosis and Hemostasis, Comprehensive Hemophilia Diagnosis and Treatment Center, University of North Carolina, Chapel Hill, NC, USA
| | - Aime Beebe
- Departments of Medicine and Pharmacology, Center for Thrombosis and Hemostasis, Comprehensive Hemophilia Diagnosis and Treatment Center, University of North Carolina, Chapel Hill, NC, USA
| | - Brenda Nielsen
- Departments of Medicine and Pharmacology, Center for Thrombosis and Hemostasis, Comprehensive Hemophilia Diagnosis and Treatment Center, University of North Carolina, Chapel Hill, NC, USA
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7
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White GC, Courter S, Bray GL, Lee M, Gomperts ED. A Multicenter Study of Recombinant Factor VIII (RecombinateTM) in Previously Treated Patients with Hemophilia A. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1656030] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryA prospective, open-label multicenter investigation has been conducted to compare pharmacokinetic parameters of recombinant DNA-derived FVIII (rFVIII) and plasma-derived FVIII concentrate (pdFVIII) and to assess safety and efficacy of long-term home-treat- ment with rFVIII for subjects with hemophilia A. Following comparative in vivo pharmacokinetic studies, 69 patients with severe (n = 67) or moderate (n = 2) hemophilia A commenced a program of home treatment using rFVIII exclusively for prophylaxis and treatment of all bleeding episodes for a period of 1.0 to 5.7 years (median 3.7 years). The mean in vivo half-lives of rFVIII and pdFVIII were both 14.7 h. In vivo incremental recoveries at baseline were 2.40%/IU/kg and 2.47%/IU/kg, respectively (p = 0.59). The response to home treatment with rFVIII was categorized as good or excellent in 3,195 (91.2%) of 3,481 evaluated bleeding episodes. Thirteen patients received rFVIII for prophylaxis for twenty-four surgical procedures. In all cases, hemostasis was excellent. Adverse reactions were observed in only 13 of 13,591 (0.096%) infusions of rFVIII; none was serious. No patient developed an inhibitor to r FVIII.
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Affiliation(s)
- G C White
- The Center of Thrombosis and Hemostasis, Departments of Medicine and Pharmacology, University of North Carolina School of Medicine Chapel Hill, NC and the Dept, of Medical and Clinical Affairs, Baxter/Hyland Division, Glendale, CA, USA
| | | | - G L Bray
- The Center of Thrombosis and Hemostasis, Departments of Medicine and Pharmacology, University of North Carolina School of Medicine Chapel Hill, NC and the Dept, of Medical and Clinical Affairs, Baxter/Hyland Division, Glendale, CA, USA
| | - M Lee
- The Center of Thrombosis and Hemostasis, Departments of Medicine and Pharmacology, University of North Carolina School of Medicine Chapel Hill, NC and the Dept, of Medical and Clinical Affairs, Baxter/Hyland Division, Glendale, CA, USA
| | - E D Gomperts
- The Center of Thrombosis and Hemostasis, Departments of Medicine and Pharmacology, University of North Carolina School of Medicine Chapel Hill, NC and the Dept, of Medical and Clinical Affairs, Baxter/Hyland Division, Glendale, CA, USA
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8
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White GC, Shapiro AD, Kurczynski EM, Kim HC, Bergman GE. Variability of In Vivo Recovery of Factor IX after Infusion of Monoclonal Antibody Purified Factor IX Concentrates in Patients with Hemophilia B. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1653868] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryMonoclonal antibody purified factor IX concentrate, Mononine® (Armour Pharmaceutical Company, Kankakee, Illinois, USA), is a recently developed replacement factor concentrate for the treatment of patients with hemophilia B. The pharmacokinetic properties of monoclonal antibody purified factor IX concentrate (MAb Factor IX concentrate) have been evaluated in only small samples of patients, and little is known about those factors that might influence in vivo recovery of factor IX after infusion in a larger patient population. In vivo recovery of factor IX was therefore evaluated for 80 different indications in 72 patients who received MAb Factor IX concentrate for the management of spontaneous or trauma-induced bleeding, or as prophylaxis with surgery. The average recovery after infusions for presurgical pharmacokinetic analysis (mean ± standard deviation) was 1.28 ± 0.56 U/dl rise per U/kg infused (range 0.41-2.80), and the average recovery after all infusions for treatment was 1.23 ± 0.49 U/dl rise per U/kg infused (range -0.35-2.92). Recovery values for multiple MAb Factor IX doses in a given patient were also variable; the average recovery was 1.22 ± 0.53 U/dl rise per U/kg given, and standard deviations ranged from 0.03 to 1.26. Patient age, weight, and MAb Factor IX concentrate dose minimally but significantly influenced factor IX recovery. There was no significant effect of either race, history of previous thrombotic complications during treatment with other replacement factor concentrates, or bleeding state on recovery. All of the patients treated with this preparation experienced excellent hemostasis, and no thrombotic complications were observed.
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Affiliation(s)
- Gilbert C White
- The Center for Thrombosis and Hemostasis, University of North Carolina Medical School, Chapel Hill, NC, USA
| | - Amy D Shapiro
- Riley Hospital for Children, Indiana University Medical Center, Indianapolis, IN, USA
| | | | - Hugh C Kim
- Division of Hematology-Oncology, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
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9
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Kasper CK, Aronson DL, Davignon G, Foster P, Hillman-Wiseman C, Lusher JM, Manco-Johnson M, Meade JB, Montgomery RR, Rickies FR, White GC. Comparison of Six Commercial Plasma References for Factor VIII, Factor IX and von Willebrand Factor. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1649860] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummarySix brands of normal reference plasma produced in the United States, with assigned assay values for factor VIII and IX and, in four instances, ristocetin cofactor and von Willebrand antigen, were assayed in nine coagulation laboratories in academic institutions in the same country. Differences in mean assays of reference plasmas, as a percent of labelled potency, were significant and were greater than differences among laboratories. Standard methods of assigning potency to commercial reference plasmas are recommended.
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Affiliation(s)
- Carol K Kasper
- The Orthopaedic Hospital University of Southern California, Los Angeles, California, USA
| | - David L Aronson
- The George Washington University Medical Center, Washington D.C., USA
| | | | - Paul Foster
- The Blood Center of Southeastern Wisconsin, Milwaukee, Wisconsin, USA
| | | | - Jeanne M Lusher
- The Children’s Hospital of Michigan, Wayne State University, Detroit, Michigan
| | | | - James B Meade
- The University of North Carolina Hospitals, Chapel Hill, North Carolina, USA
| | | | | | - Gilbert C White
- The University of North Carolina Hospitals, Chapel Hill, North Carolina, USA
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10
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Abstract
SummaryBleeding episodes in patients with hemophilia A with anti-factor VIII antibodies are frequently difficult to treat. Factor VIII concentrates administered by continuous infusion or prothrombin complex concentrates (PCC) have been used for treatment. Hemophilia A patients with inhibitors who respond to factor VIII concentrates generally have low to moderate inhibitor titers (generally less than 20 Bethesda units). Those patients who receive PCC are quite difficult to evaluate but promising clinical responses have clearly been observed. This paper describes our experience with both modalities of therapy and will offer specific guidelines for such therapy.
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11
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Xu Z, Ni B, Cao Z, Zielonka J, Gao J, Chen F, Kalyanaraman B, White GC, Ma YQ. Kindlin-3 negatively regulates the release of neutrophil extracellular traps. J Leukoc Biol 2018; 104:597-602. [PMID: 29656482 DOI: 10.1002/jlb.3ab0118-005r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/15/2018] [Accepted: 03/20/2018] [Indexed: 12/28/2022] Open
Abstract
Neutrophils fight infections by generating reactive oxygen species (ROS) and extracellular traps (NETs). However, how neutrophils modulate ROS/NET generation is mechanistically unclear. Kindlin-3, an essential integrin activator expressed in hematopoietic cells, is required to support integrin-mediated neutrophil recruitment during inflammation. Here, we report a novel role of kindlin-3 in regulating ROS/NET generation in neutrophils. When overexpressing kindlin-3 in neutrophil-like differentiated HL-60 cells (HL-60N), ROS/NET generation from these cells were significantly suppressed. Interestingly, overexpression of a kindlin-3 mutant that is defective for interacting with integrins in HL-60N cells still inhibited ROS/NET generation, suggesting that the role of kindlin-3 in inhibiting ROS/NET signaling may be independent of its binding to integrins. Consistently, knockdown of kindlin-3 in HL-60N cells led to enhanced ROS/NET generation. In addition, bone marrow neutrophils isolated from kindlin-3-deficient mice showed elevated ROS/NET generation when compared with WT counterparts. As expected, overexpression of exogenous kindlin-3 in mouse neutrophils could suppress NET release ex vivo and in vivo. Collectively, these results demonstrate that kindlin-3 in neutrophils is involved in modulating the ROS/NET signaling, providing a novel mechanism for fine-tuning neutrophil behaviors during inflammation.
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Affiliation(s)
- Zhen Xu
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, Wisconsin, USA.,Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Beiwen Ni
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, Wisconsin, USA.,Department of Hematology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Zhongyuan Cao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Jacek Zielonka
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Juan Gao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China
| | - Fangyuan Chen
- Department of Hematology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | | | - Gilbert C White
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, Wisconsin, USA.,Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Yan-Qing Ma
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, Wisconsin, USA.,Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China.,Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
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12
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White GC, Blatt PM. Harold Ross Roberts, MD: inspirational mentor, consummate physician, superb scientist (1930-2017). Res Pract Thromb Haemost 2018. [PMCID: PMC6055499 DOI: 10.1002/rth2.12059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Gilbert C. White
- Blood Center of Wisconsin; Medical College of Wisconsin; Milwaukee WI USA
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13
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White GC, Blatt PM. Harold Ross Roberts, M.D: inspirational mentor, consummate physician, superb scientist (1930-2017). J Thromb Haemost 2017; 15:2468-2470. [PMID: 29152851 DOI: 10.1111/jth.13884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- G C White
- Blood Center of Wisconsin, Medical College of Wisconsin, Milwaukee, WI, USA
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14
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Gao J, Huang M, Lai J, Mao K, Sun P, Cao Z, Hu Y, Zhang Y, Schulte ML, Jin C, Wang J, White GC, Xu Z, Ma YQ. Kindlin supports platelet integrin αIIbβ3 activation by interacting with paxillin. J Cell Sci 2017; 130:3764-3775. [PMID: 28954813 DOI: 10.1242/jcs.205641] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 09/18/2017] [Indexed: 12/30/2022] Open
Abstract
Kindlins play an important role in supporting integrin activation by cooperating with talin; however, the mechanistic details remain unclear. Here, we show that kindlins interacted directly with paxillin and that this interaction could support integrin αIIbβ3 activation. An exposed loop in the N-terminal F0 subdomain of kindlins was involved in mediating the interaction. Disruption of kindlin binding to paxillin by structure-based mutations significantly impaired the function of kindlins in supporting integrin αIIbβ3 activation. Both kindlin and talin were required for paxillin to enhance integrin activation. Interestingly, a direct interaction between paxillin and the talin head domain was also detectable. Mechanistically, paxillin, together with kindlin, was able to promote the binding of the talin head domain to integrin, suggesting that paxillin complexes with kindlin and talin to strengthen integrin activation. Specifically, we observed that crosstalk between kindlin-3 and the paxillin family in mouse platelets was involved in supporting integrin αIIbβ3 activation and in vivo platelet thrombus formation. Taken together, our findings uncover a novel mechanism by which kindlin supports integrin αIIbβ3 activation, which might be beneficial for developing safer anti-thrombotic therapies.
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Affiliation(s)
- Juan Gao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Ming Huang
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Jingjing Lai
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Kaijun Mao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Peisen Sun
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Zhongyuan Cao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Youpei Hu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Yingying Zhang
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Marie L Schulte
- Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA
| | - Chaozhi Jin
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences, Beijing 102206, China
| | - Jian Wang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences, Beijing 102206, China
| | - Gilbert C White
- Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA.,Department of Biochemistry, Medical College of Milwaukee, Wisconsin, WI 53226, USA
| | - Zhen Xu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China .,Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA
| | - Yan-Qing Ma
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China .,Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA.,Department of Biochemistry, Medical College of Milwaukee, Wisconsin, WI 53226, USA
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15
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16
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Johnson CA, Poon MC, Andes WA, Lemon SM, Mah MW, Royce RA, Rathouz PJ, Wang JG, White GC, Janco RL, Hanna WT, Charlton Davis P. Prevalence of Hepatitis A
Antibodies in Hemophiliacs:
Preliminary Results from the
Southeastern Delta Hepatitis Study. Vox Sang 2017. [DOI: 10.1159/000462665] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Osmundson DB, White GC. Long-term mark-recapture monitoring of a Colorado pikeminnow Ptychocheilus lucius population: assessing recovery progress using demographic trends. ENDANGER SPECIES RES 2017. [DOI: 10.3354/esr00842] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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18
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Key NS, Khorana AA, Mackman N, McCarty OJT, White GC, Francis CW, McCrae KR, Palumbo JS, Raskob GE, Chan AT, Sood AK. Thrombosis in Cancer: Research Priorities Identified by a National Cancer Institute/National Heart, Lung, and Blood Institute Strategic Working Group. Cancer Res 2016; 76:3671-5. [PMID: 27527638 DOI: 10.1158/0008-5472.can-15-3100] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 04/25/2016] [Indexed: 11/16/2022]
Abstract
The risk for venous thromboembolism (VTE) is increased in cancer and particularly with chemotherapy, and it portends poorer survival among patients with cancer. However, many fundamental questions about cancer-associated VTE, or Trousseau syndrome, remain unanswered. This report summarizes the proceedings of a working group assembled by the NCI and NHLBI in August 2014 to explore the state of the science in cancer-associated VTE, identify clinically important research gaps, and develop consensus on priorities for future research. Representing a convergence of research priorities between the two NIH Institutes, the workshop addressed epidemiologic, basic science, clinical, and translational issues in cancer-associated VTE. Cancer Res; 76(13); 3671-5. ©2016 AACR.
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Affiliation(s)
- Nigel S Key
- Division of Hematology/Oncology, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Alok A Khorana
- Department of Hematology and Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio
| | - Nigel Mackman
- Division of Hematology/Oncology, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
| | - Owen J T McCarty
- Department of Biomedical Engineering and Cell and Development Biology, Oregon Health and Science University, Portland, Orlando
| | - Gilbert C White
- Blood Research Institute, Blood Center of Wisconsin, Department of Medicine, Biochemistry, and Pharmacology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Charles W Francis
- James P. Wilmot Cancer Center and Department of Medicine, University of Rochester, Rochester, New York
| | - Keith R McCrae
- Department of Hematology and Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio. Department of Cellular and Molecular Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Joseph S Palumbo
- Division of Hematology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Gary E Raskob
- Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Andrew T Chan
- Clinical and Translational Epidemiology Unit and Division of Gastroenterology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Anil K Sood
- Department of Gynecologic Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas. Department of Cancer Biology, University of Texas MD Anderson Cancer Center, Houston, Texas
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19
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Chrzanowska-Wodnicka M, White GC, Quilliam LA, Whitehead KJ. Small GTPase Rap1 Is Essential for Mouse Development and Formation of Functional Vasculature. PLoS One 2015; 10:e0145689. [PMID: 26714318 PMCID: PMC4694701 DOI: 10.1371/journal.pone.0145689] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Accepted: 12/07/2015] [Indexed: 11/18/2022] Open
Abstract
Background Small GTPase Rap1 has been implicated in a number of basic cellular functions, including cell-cell and cell-matrix adhesion, proliferation and regulation of polarity. Evolutionarily conserved, Rap1 has been studied in model organisms: yeast, Drosophila and mice. Mouse in vivo studies implicate Rap1 in the control of multiple stem cell, leukocyte and vascular cell functions. In vitro, several Rap1 effectors and regulatory mechanisms have been proposed. In particular, Rap1 has been implicated in maintaining epithelial and endothelial cell junction integrity and linked with cerebral cavernous malformations. Rationale How Rap1 signaling network controls mammalian development is not clear. As a first step in addressing this question, we present phenotypes of murine total and vascular-specific Rap1a, Rap1b and double Rap1a and Rap1b (Rap1) knockout (KO) mice. Results and Conclusions The majority of total Rap1 KO mice die before E10.5, consistent with the critical role of Rap1 in epithelial morphogenesis. At that time point, about 50% of Tie2-double Rap1 KOs appear grossly normal and develop normal vasculature, while the remaining 50% suffer tissue degeneration and show vascular abnormalities, including hemorrhages and engorgement of perineural vessels, albeit with normal branchial arches. However, no Tie2-double Rap1 KO embryos are present at E15.5, with hemorrhages a likely cause of death. Therefore, at least one Rap1 allele is required for development prior to the formation of the vascular system; and in endothelium–for the life-supporting function of the vasculature.
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Affiliation(s)
| | - Gilbert C. White
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, 53201, United States of America
| | - Lawrence A. Quilliam
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, United States of America
| | - Kevin J. Whitehead
- Division of Cardiovascular Medicine, Pediatric Cardiology, Molecular Medicine Program, University of Utah, Salt Lake City, UT, 84112, United States of America
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20
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White GC, Francis CW. Victor J. Marder, M.D.: physician, scientist, founder, lover of the arts, teacher, leader (1934-2015). J Thromb Haemost 2015; 13:1354-7. [PMID: 26095865 DOI: 10.1111/jth.12985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G C White
- BloodCenter of Wisconsin, USA
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - C W Francis
- University of Rochester School of Medicine, Rochester, NY, USA
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21
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Xu Z, Chen X, Zhi H, Gao J, Bialkowska K, Byzova TV, Pluskota E, White GC, Liu J, Plow EF, Ma YQ. Direct interaction of kindlin-3 with integrin αIIbβ3 in platelets is required for supporting arterial thrombosis in mice. Arterioscler Thromb Vasc Biol 2014; 34:1961-7. [PMID: 24969775 DOI: 10.1161/atvbaha.114.303851] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Kindlin-3 is a critical supporter of integrin function in platelets. Lack of expression of kindlin-3 protein in patients impairs integrin αIIbβ3-mediated platelet aggregation. Although kindlin-3 has been categorized as an integrin-binding partner, the functional significance of the direct interaction of kindlin-3 with integrin αIIbβ3 in platelets has not been established. Here, we evaluated the significance of the binding of kindlin-3 to integrin αIIbβ3 in platelets in supporting integrin αIIbβ3-mediated platelet functions. APPROACH AND RESULTS We generated a strain of kindlin-3 knockin (K3KI) mice that express a kindlin-3 mutant that carries an integrin-interaction defective substitution. K3KI mice could survive normally and express integrin αIIbβ3 on platelets similar to their wild-type counterparts. Functional analysis revealed that K3KI mice exhibited defective platelet function, including impaired integrin αIIbβ3 activation, suppressed platelet spreading and platelet aggregation, prolonged tail bleeding time, and absence of platelet-mediated clot retraction. In addition, whole blood drawn from K3KI mice showed resistance to in vitro thrombus formation and, as a consequence, K3KI mice were protected from in vivo arterial thrombosis. CONCLUSIONS These observations demonstrate that the direct binding of kindlin-3 to integrin αIIbβ3 is involved in supporting integrin αIIbβ3 activation and integrin αIIbβ3-dependent responses of platelets and consequently contributes significantly to arterial thrombus formation.
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Affiliation(s)
- Zhen Xu
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Xue Chen
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Huiying Zhi
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Juan Gao
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Katarzyna Bialkowska
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Tatiana V Byzova
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Elzbieta Pluskota
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Gilbert C White
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Junling Liu
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Edward F Plow
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.)
| | - Yan-Qing Ma
- From the Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai, China (Z.X., J.G., E.F.P., Y.-Q.M.); Blood Research Institute, Blood Center of Wisconsin, Milwaukee (Z.X., H.Z., G.C.W., Y.-Q.M.); Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong University School of Medicine, Shanghai, China (X.C., J.L.); and Department of Molecular Cardiology, Cleveland Clinic, OH (K.B., T.V.B., E.P., E.F.P.).
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22
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Xu Z, Gao J, Chen X, Zhi H, Liu J, White GC, Plow EEF, Ma YQ. Abstract 22: Direct Interaction of Kindlin-3 with Integrins in Platelets and Neutrophils is Essential for Supporting Arterial and Venous Thrombosis in Mice. Arterioscler Thromb Vasc Biol 2014. [DOI: 10.1161/atvb.34.suppl_1.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Kindlin-3 is a critical supporter of integrin activation in hematopoietic cells. Lack of expression of kindlin-3 protein in patients can cause impaired platelet aggregation and leukocyte adhesion, leading to severe bleeding and recurrent infections. Although kindlin-3 has been categorized as one of the integrin binding partners, the functional significance of the direct interaction of kindlin-3 with integrins in platelets and leukocytes has not been established. In this study, we generated a strain of Kindlin-3 knock-in (K3KI) mice that carry a specific mutation in the Kindlin-3 gene, therefore introducing an integrin interaction defective substitution (Q
597
W
598
/AA) in kindlin-3 protein. Functional analysis revealed that K3KI mice exhibited defective platelet function, including impaired integrin αIIbβ3 activation, suppressed platelet spreading and aggregation, prolonged tail bleeding time, absence of platelet-mediated clot retraction and resistance to
in vitro
thrombus formation and
in vivo
arterial thrombosis. In addition, β
2
-integrin mediated adhesion of neutrophils from K3KI mice was dramatically inhibited and, as a consequence, deep vein thrombus formation in a flow-restricted inferior vena cava was significantly suppressed in K3KI mice. Taken together, these observations demonstrate that the direct binding of kindlin-3 to integrin in hematopoietic cells is required for supporting integrin function in platelets and leukocytes, and significantly contributes to both arterial and venous thrombus formation. Our data also suggests that the direct crosstalk between kindlin-3 and integrin represents a potential therapeutic target for developing novel anti-thrombotic strategies.
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Affiliation(s)
- Zhen Xu
- Blood Rsch Institute, Blood Cntr of Wisconsin, Milwaukee, WI
| | - Juan Gao
- Sch of Life Sciences, Shanghai Univ, Shanghai, China
| | - Xue Chen
- Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong Univ Sch of Medicine, Shanghai, China
| | - Huiying Zhi
- Blood Rsch Institute, Blood Cntr of Wisconsin, Milwaukee, WI
| | - Junling Liu
- Biochemistry and Molecular Cell Biology, Shanghai Jiao-Tong Univ Sch of Medicine, Shanghai, China
| | - Gilbert C White
- Blood Rsch Institute, Blood Cntr of Wisconsin, Milwaukee, WI
| | | | - Yan-Qing Ma
- Blood Rsch Institute, Blood Cntr of Wisconsin, Milwaukee, WI
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23
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Affiliation(s)
- P M Blatt
- Division of Hematology, Department of Medicine, Duke University School of Medicine, Durham, NC, USA
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24
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Zhang G, Xiang B, Ye S, Chrzanowska-Wodnicka M, Morris AJ, Gartner TK, Whiteheart SW, White GC, Smyth SS, Li Z. Distinct roles for Rap1b protein in platelet secretion and integrin αIIbβ3 outside-in signaling. J Biol Chem 2011; 286:39466-77. [PMID: 21940635 DOI: 10.1074/jbc.m111.239608] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Rap1b is activated by platelet agonists and plays a critical role in integrin α(IIb)β(3) inside-out signaling and platelet aggregation. Here we show that agonist-induced Rap1b activation plays an important role in stimulating secretion of platelet granules. We also show that α(IIb)β(3) outside-in signaling can activate Rap1b, and integrin outside-in signaling-mediated Rap1b activation is important in facilitating platelet spreading on fibrinogen and clot retraction. Rap1b-deficient platelets had diminished ATP secretion and P-selectin expression induced by thrombin or collagen. Importantly, addition of low doses of ADP and/or fibrinogen restored aggregation of Rap1b-deficient platelets. Furthermore, we found that Rap1b was activated by platelet spreading on immobilized fibrinogen, a process that was not affected by P2Y(12) or TXA(2) receptor deficiency, but was inhibited by the selective Src inhibitor PP2, the PKC inhibitor Ro-31-8220, or the calcium chelator demethyl-1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid tetrakis. Clot retraction was abolished, and platelet spreading on fibrinogen was diminished in Rap1b-deficient platelets compared with wild-type controls. The defects in clot retraction and spreading on fibrinogen of Rap1b-deficient platelets were not rescued by addition of MnCl(2), which elicits α(IIb)β(3) outside-in signaling in the absence of inside-out signaling. Thus, our results reveal two different activation mechanisms of Rap1b as well as novel functions of Rap1b in platelet secretion and in integrin α(IIb)β(3) outside-in signaling.
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Affiliation(s)
- Guoying Zhang
- Division of Cardiovascular Medicine, The Gill Heart Institute, University of Kentucky, Lexington, Kentucky 40536, USA
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25
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Awasthi A, Samarakoon A, Chu H, Kamalakannan R, Quilliam LA, Chrzanowska-Wodnicka M, White GC, Malarkannan S. Rap1b facilitates NK cell functions via IQGAP1-mediated signalosomes. ACTA ACUST UNITED AC 2010; 207:1923-38. [PMID: 20733035 PMCID: PMC2931159 DOI: 10.1084/jem.20100040] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Rap1 GTPases control immune synapse formation and signaling in lymphocytes. However, the precise molecular mechanism by which Rap1 regulates natural killer (NK) cell activation is not known. Using Rap1a or Rap1b knockout mice, we identify Rap1b as the major isoform in NK cells. Its absence significantly impaired LFA1 polarization, spreading, and microtubule organizing center (MTOC) formation in NK cells. Neither Rap1 isoform was essential for NK cytotoxicity. However, absence of Rap1b impaired NKG2D, Ly49D, and NCR1-mediated cytokine and chemokine production. Upon activation, Rap1b colocalized with the scaffolding protein IQGAP1. This interaction facilitated sequential phosphorylation of B-Raf, C-Raf, and ERK1/2 and helped IQGAP1 to form a large signalosome in the perinuclear region. These results reveal a previously unrecognized role for Rap1b in NK cell signaling and effector functions.
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Affiliation(s)
- Aradhana Awasthi
- Molecular Immunology, Blood Research Institute, Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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26
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Carbo C, Duerschmied D, Goerge T, Hattori H, Sakai J, Cifuni SM, White GC, Chrzanowska-Wodnicka M, Luo HR, Wagner DD. Integrin-independent role of CalDAG-GEFI in neutrophil chemotaxis. J Leukoc Biol 2010; 88:313-9. [PMID: 20413728 DOI: 10.1189/jlb.0110049] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Chemotaxis and integrin activation are essential processes for neutrophil transmigration in response to injury. CalDAG-GEFI plays a key role in the activation of beta1, beta2, and beta3 integrins in platelets and neutrophils by exchanging a GDP for a GTP on Rap1. Here, we explored the role of CalDAG-GEFI and Rap1b in integrin-independent neutrophil chemotaxis. In a transwell assay, CalDAG-GEFI-/- neutrophils had a 46% reduction in transmigration compared with WT in response to a low concentration of LTB4. Visualization of migrating neutrophils in the presence of 10 mM EDTA revealed that CalDAG-GEFI-/- neutrophils had abnormal chemotactic behavior compared with WT neutrophils, including reduced speed and directionality. Interestingly, Rap1b-/- neutrophils had a similar phenotype in this assay, suggesting that CalDAG-GEFI may be acting through Rap1b. We investigated whether the deficit in integrin-independent chemotaxis in CalDAG-GEFI-/- neutrophils could be explained by defective cytoskeleton rearrangement. Indeed, we found that CalDAG-GEFI-/- neutrophils had reduced formation of F-actin pseudopodia after LTB4 stimulation, suggesting that they have a defect in polarization. Overall, our studies show that CalDAG-GEFI helps regulate neutrophil chemotaxis, independent of its established role in integrin activation, through a mechanism that involves actin cytoskeleton and cellular polarization.
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Affiliation(s)
- Carla Carbo
- Immune Disease Institute, Program in Cellular and Molecular Medicine, Department of Laboratory Medicine, Children's Hospital, and Department of Pathology, Harvard Medical School, 3 Blackfan Circle, Boston, MA 02115, USA
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27
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White GC. Hemophilia: an amazing 35-year journey from the depths of HIV to the threshold of cure. Trans Am Clin Climatol Assoc 2010; 121:61-75. [PMID: 20697550 PMCID: PMC2917149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Methods developed in the early 1970s to highly purify factor VIII (FVIII) from the plasma of large numbers of blood donors led, for the first time, to concentrates of FVIII that enabled hemophiliac to self-treat, providing independence and opening the way to safe surgery and other treatments. But, with the introduction of blood-borne viruses such as HIV-1 and hepatitis C viruses into the blood supply, these concentrates also transmitted HIV and hepatitis to a high percentage of hemophiliacs. Nevertheless, from the depths of the AIDS epidemic in hemophilia came extraordinary scientific advances that led to recombinant FVIII, the identification of HIV as the agent causing AIDS, the eventual development of effective treatments for AIDS, gene transfer approaches using lentiviruses, and treatments for hepatitis C. All of these have improved the lives of current and future hemophiliacs and have brought us to the threshold of a cure.
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Affiliation(s)
- Gilbert C White
- Blood Research Institute, BloodCenter of Wisconsin, Post Office Box 2178, Milwaukee, WI 53201-2178, USA
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28
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Abstract
Thrombin is a potent agonist of platelets. In the current article, the research on the interaction of thrombin with blood platelets is reviewed starting with the first studies demonstrating the direct action of thrombin on platelets and ending with an analysis of the importance of the protease-activated receptors (PARs) and the GpIb complex. The antithrombin activity of platelets is discussed in terms of the binding of thrombin to receptor(s) on the platelet surface. Evaluation of the PAR receptors and the GpIb supports a model where thrombin binds to the GpIb receptor prior to the proteolysis of the PAR receptor(s). Thus, the maximal hemostatic response requires both PAR receptors and the GpIb receptors.
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Affiliation(s)
- Roger L Lundblad
- Department of Pathology, University of North Carolina, Chapel Hill, NC 27516-6695, USA.
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29
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Wang Z, Holly SP, Larson MK, Liu J, Yuan W, Chrzanowska-Wodnicka M, White GC, Parise LV. Rap1b is critical for glycoprotein VI-mediated but not ADP receptor-mediated alpha2beta1 activation. J Thromb Haemost 2009; 7:693-700. [PMID: 19192113 PMCID: PMC2904080 DOI: 10.1111/j.1538-7836.2009.03289.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND The platelet alpha2beta1 integrin functions as both an adhesion and signaling receptor upon exposure to collagen. Recent studies have indicated that alpha2beta1 function can be activated via inside-out signaling, similar to the prototypical platelet integrin alphaIIbbeta3. However, signaling molecules that regulate alpha2beta1 activation in platelets are not well defined. A strong candidate molecule is the small GTPase Rap1b, the dominant platelet isoform of Rap1, which regulates alphaIIbbeta3 activation. OBJECTIVES We hypothesized that Rap1b positively regulates alpha2beta1 during agonist-induced platelet activation. METHODS To test whether Rap1b activates alpha2beta1 downstream of glycoprotein (GP)VI or other platelet receptors, we stimulated platelets purified from Rap1b-/- or wild-type mice with diverse agonists and measured alpha2beta1 activation using fluorescein isothiocyanate-labeled monomeric collagen. We also examined the role of Rap1b in outside-in signaling pathways by analyzing adhesion and spreading of Rap1b-/- or wild-type platelets on monomeric, immobilized collagen. Finally, we monitored the activation status of related Rap GTPases to detect changes in signaling pathways potentially associated with Rap1b-mediated events. RESULTS Rap1b-/- platelets displayed comparable ADP-induced or thrombin-induced alpha2beta1 activation as wild-type platelets, but reduced convulxin-dependent alpha2beta1 activation. Rap1b-/- platelets exhibited increased spreading on immobilized collagen but similar adhesion to immobilized collagen compared to wild-type platelets. Rap1b-/- platelets also showed Rap1a and Rap2 activation upon agonist stimulation, possibly revealing functional compensation among Rap family members. CONCLUSIONS Rap1b is required for maximal GPVI-induced but not ADP-induced activation of alpha2beta1 in murine platelets.
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Affiliation(s)
- Z Wang
- Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7260, USA
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30
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Affiliation(s)
- G C White
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI 53201-2178, USA.
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Chu H, Awasthi A, White GC, Chrzanowska-Wodnicka M, Malarkannan S. Rap1b regulates B cell development, homing, and T cell-dependent humoral immunity. J Immunol 2008; 181:3373-83. [PMID: 18714009 DOI: 10.4049/jimmunol.181.5.3373] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Rap1 is a small GTPase that belongs to Ras superfamily. This ubiquitously expressed GTPase is a key regulator of integrin functions. Rap1 exists in two isoforms: Rap1a and Rap1b. Although Rap1 has been extensively studied, its isoform-specific functions in B cells have not been elucidated. In this study, using gene knockout mice, we show that Rap1b is the dominant isoform in B cells. Lack of Rap1b significantly reduced the absolute number of B220(+)IgM(-) pro/pre-B cells and B220(+)IgM(+) immature B cells in bone marrow. In vitro culture of bone marrow-derived Rap1b(-/-) pro/pre-B cells with IL-7 showed similar proliferation levels but reduced adhesion to stromal cell line compared with wild type. Rap1b(-/-) mice displayed reduced splenic marginal zone (MZ) B cells, and increased newly forming B cells, whereas the number of follicular B cells was normal. Functionally, Rap1b(-/-) mice showed reduced T-dependent but normal T-independent humoral responses. B cells from Rap1b(-/-) mice showed reduced migration to SDF-1, CXCL13 and in vivo homing to lymph nodes. MZ B cells showed reduced sphingosine-1-phosphate-induced migration and adhesion to ICAM-1. However, absence of Rap1b did not affect splenic B cell proliferation, BCR-mediated activation of Erk1/2, p38 MAPKs, and AKT. Thus, Rap1b is crucial for early B cell development, MZ B cell homeostasis and T-dependent humoral immunity.
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Affiliation(s)
- Haiyan Chu
- Laboratory of Molecular Immunology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Fischer TH, Merricks EP, Russell KE, Raymer RA, White GC, Bode AP, Nichols TC, Read MS. Intracellular function in rehydrated lyophilized platelets. Br J Haematol 2008. [DOI: 10.1111/j.1365-2141.2000.02343.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- G C White
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, WI 53201-2178, USA.
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Awasthi A, Samarakoon A, Chu H, Wodnicka M, White GC, Malarkannan S. Rap1b-GTPase Regulated Cytokine Generation in murine NK Cells (89.19). The Journal of Immunology 2007. [DOI: 10.4049/jimmunol.178.supp.89.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Abstract
Rap1 belongs to Ras superfamily that consists of more than hundred GTP-binding proteins involved in a variety of essential cellular processes. Rap1 exists in two closely related isoforms: Rap1a and Rap1b. Although Rap1 isoforms are known to regulate cell growth, differentiation and survival, their precise functions in lymphocytes have not been defined. In this study, using single gene knockout mice we analyzed the role of Rap1 isoforms in the development and effector functions of natural killer (NK) cells. Both Rap1a and Rap1b are expressed in NK cells and the lack of these GTPases did not affect the development and terminal maturation of NK cells. Moreover, NK–mediated cytotoxicity against ‘missing-self’, ‘induced-self’ and ‘allo’ target cells were not altered by the absence of either Rap1a or Rap1b. However, the ability of NK cells to generate inflammatory cytokines in the absence of Rap1b isoform was significantly reduced. Further, NK cells lacking Rap1a generated normal levels of these cytokines demonstrating the functional divergence between Rap1a and Rap1b isoforms. We conclude that Rap1b is a critical regulator of a signalling pathway that governs the cytokine generation in NK cells.
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Affiliation(s)
| | | | | | - Magdalena Wodnicka
- 2Vascular Endothelial Cell Biology, Blood Research Institute, 8727 Watertown Plank Road, Milwaukee, WI, 53226,
| | - Gilbert C. White
- 2Vascular Endothelial Cell Biology, Blood Research Institute, 8727 Watertown Plank Road, Milwaukee, WI, 53226,
| | - Subramaniam Malarkannan
- 1Molecular Immunology,
- 3Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226
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Wilcox DA, White GC. Gene Therapy for Platelet Disorders. Platelets 2007. [DOI: 10.1016/b978-012369367-9/50833-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Affiliation(s)
- G C White
- Blood Research Institute, Blood Center of Wisconsin, Milwaukee, WI 53201-2178, USA.
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Abstract
Platelets are important for primary hemostasis. When a blood vessel is damaged, platelets adhere to exposed subendothelial connective tissue and form a hemostatic plug. Formation of the plug is contingent upon a series of processes, with adhesion, activation, and aggregation all being involved. Patients with quantitative platelet disorders have reduced numbers of platelets. Patients with qualitative disorders have platelets that exhibit abnormal functioning. Defects that impair function can affect platelet receptors, secretory responses, or intracellular signaling pathways. Examples of qualitative platelet disorders include Glanzmann's thrombasthenia (GT) and Bernard-Soulier syndrome (BSS). The treatment of platelet disorders is primarily with platelet concentrates. However, in patients with abnormalities of their platelet surface receptors, platelet transfusion may provoke an immune response. Recombinant factor VIIa (rFVIIa) may provide hemostatically effective therapy in such patients.
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White GC, Kempton CL, Grimsley A, Nielsen B, Roberts HR. Cellular immune responses in hemophilia: why do inhibitors develop in some, but not all hemophiliacs? J Thromb Haemost 2005; 3:1676-81. [PMID: 16102033 DOI: 10.1111/j.1538-7836.2005.01375.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Advances in molecular immunology over the past two decades permit a better understanding of why antibodies develop to peptide antigens like factor VIII and the events that lead to the development of these antibodies. Two important variables that are critical in antibody formation are (i) the molecular defect in FVIII and the consequences of that defect on translation and protein production, and (ii) the major histocompatibility complex (MHC) molecules which bind specific peptide sequences and present those peptides to CD4 T lymphocytes to initiate the cellular cascade leading to B-cell stimulation and differentiation, and ultimately to antibody formation. Inhibitors develop in hemophilia because transfused FVIII can be seen as a foreign protein and elicits an immune response in much the same way that any other foreign protein might elicit an immune response. However, not all hemophiliacs generate an immune response, either because they do not recognize FVIII as foreign or because their MHC phenotype is such that a cellular immune response is not initiated. In this model, it is the combination of molecular defect and MHC phenotype that determines inhibitor formation. The interplay of these two variables in the context of why some but not all hemophiliacs develop antibodies after treatment with replacement factor is reviewed.
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Affiliation(s)
- G C White
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin 53226-3548, USA.
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Chrzanowska-Wodnicka M, Smyth SS, Schoenwaelder SM, Fischer TH, White GC. Rap1b is required for normal platelet function and hemostasis in mice. J Clin Invest 2005. [DOI: 10.1172/jci22973c1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Astermark J, Oldenburg J, Escobar M, White GC, Berntorp E. The Malmö International Brother Study (MIBS). Genetic defects and inhibitor development in siblings with severe hemophilia A. Haematologica 2005; 90:924-31. [PMID: 15996930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023] Open
Abstract
BACKGROUND AND OBJECTIVES The strongest risk factor identified for inhibitor development in people with severe hemophilia A is the type of factor VIII gene mutation. The objective of this study was to evaluate the mutation type dependent concordance rate of inhibitor formation in siblings. DESIGN AND METHODS The gene defect, treatment and inhibitor history were evaluated in 113 families in which two or more siblings had severe hemophilia A. RESULTS Seventy-nine of the families (69.9%) were concordant in that either all or none of the siblings had a history of inhibitors. The concordance in 59 families with inhibitors was 42.4%. The corresponding figures for the 74 families with intron 22 inversion were 63.5% and 40.0%, respectively, and the overall concordance within 14 families with nonsense mutations was 78.6%. The siblings in two families with large gene deletions had no inhibitor history. A small proportion of the families with missense mutations, small deletions/insertions and splice site mutations developed inhibitors, but in four of the families two or more siblings developed high-responding inhibitors. In 18 of the 25 concordant families (72.0%) with inhibitors, the inhibitor was also of the same type (high-responding). INTERPRETATION AND CONCLUSIONS This is the first study of the association between inhibitor formation and the causative factor VIII gene mutation in siblings. The data show that the type of mutation provides, to some extent, the basis for this relationship, but the mutation itself is not enough to predict the risk for therapy-induced inhibitor formation.
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Affiliation(s)
- Jan Astermark
- Department for Coagulation Disorders University Hospital SE-205 02 Malmö, Sweden.
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Fang J, Hodivala-Dilke K, Johnson BD, Du LM, Hynes RO, White GC, Wilcox DA. Therapeutic expression of the platelet-specific integrin, alphaIIbbeta3, in a murine model for Glanzmann thrombasthenia. Blood 2005; 106:2671-9. [PMID: 15972454 PMCID: PMC1895311 DOI: 10.1182/blood-2004-12-4619] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Integrins mediate the adhesion of cells to each other and to the extracellular matrix during development, immunity, metastasis, thrombosis, and wound healing. Molecular defects in either the alpha- or beta-subunit can disrupt integrin synthesis, assembly, and/or binding to adhesive ligands. This is exemplified by the bleeding disorder, Glanzmann thrombasthenia (GT), where abnormalities of the platelet-specific integrin, alphaIIbbeta3, prevent platelet aggregation following vascular injury. We previously used a retrovirus vector containing a cDNA cassette encoding human integrin beta3 to restore integrin alphaIIbbeta3 on the surface of megakaryocytes derived from peripheral blood stem cells of GT patients. In the present study, bone marrow from beta3-deficient (beta3-/-) mice was transduced with the ITGbeta3-cassette to investigate whether the platelet progeny could establish hemostasis in vivo. A lentivirus transfer vector equipped with the human ITGA2B gene promoter confined transgene expression to the platelet lineage. Human beta3 formed a stable complex with murine alphaIIb, effectively restoring platelet function. Mice expressing significant levels of alphaIIbbeta3 on circulating platelets exhibited improved bleeding times. Intravenous immunoglobulin effectively diminished platelet clearance in animals that developed an antibody response to alphaIIbbeta3. These results indicate the feasibility of targeting platelets with genetic therapies for better management of patients with inherited bleeding disorders.
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Affiliation(s)
- Juan Fang
- Department of Pediatrics, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, USA
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Chrzanowska-Wodnicka M, Smyth SS, Schoenwaelder SM, Fischer TH, White GC. Rap1b is required for normal platelet function and hemostasis in mice. J Clin Invest 2005; 115:680-7. [PMID: 15696195 PMCID: PMC546455 DOI: 10.1172/jci22973] [Citation(s) in RCA: 246] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2004] [Accepted: 12/14/2004] [Indexed: 11/17/2022] Open
Abstract
Rap1b, an abundant small GTPase in platelets, becomes rapidly activated upon stimulation with agonists. Though it has been implicated to act downstream from G protein-coupled receptors (GPCRs) and upstream of integrin alpha IIbbeta3, the precise role of Rap1b in platelet function has been elusive. Here we report the generation of a murine rap1b knockout and show that Rap1b deficiency results in a bleeding defect due to defective platelet function. Aggregation of Rap1b-null platelets is reduced in response to stimulation with both GPCR-linked and GPCR-independent agonists. Underlying the defective Rap1b-null platelet function is decreased activation of integrin alphaIIbbeta3 in response to stimulation with agonists and signaling downstream from the integrin alpha IIbbeta3. In vivo, Rap1b-null mice are protected from arterial thrombosis. These data provide genetic evidence that Rap1b is involved in a common pathway of integrin activation, is required for normal hemostasis in vivo, and may be a clinically relevant antithrombotic therapy target.
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Affiliation(s)
- Magdalena Chrzanowska-Wodnicka
- Department of Medicine and Carolina Cardiovascular Biology Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
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Kessler CM, Gill JC, White GC, Shapiro A, Arkin S, Roth DA, Meng X, Lusher JM. B-domain deleted recombinant factor VIII preparations are bioequivalent to a monoclonal antibody purified plasma-derived factor VIII concentrate: a randomized, three-way crossover study. Haemophilia 2005; 11:84-91. [PMID: 15810908 DOI: 10.1111/j.1365-2516.2005.01068.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Deletion of the B-domain of recombinant blood coagulation factor VIII (BDDrFVIII) increases the manufacturing yield of the product but does not impair in vitro or in vivo functionality. BDDrFVIII (ReFacto) has been developed with the additional benefit of being formulated without human albumin. OBJECTIVE The primary objective of this three-way crossover-design study was to compare the pharmacokinetic (PK) parameters of two BDDrFVIII formulations (one reconstituted with 5 mL of sterile water, the other reconstituted with 4 mL sodium chloride 0.9% USP) with those of a plasma-derived, full-length FVIII preparation (Hemofil M) in patients with haemophilia A to determine bioequivalence. METHODS A series of blood samples were collected over a period of 48 h after i.v. administration of each of the FVIII preparations. Plasma FVIII activity was determined using a validated chromogenic substrate assay. Plasma FVIII activity vs. time curves was characterized for a standard set of PK parameter estimates. Two parameter estimates, the maximum plasma concentration (Cmax) and the area under plasma concentration vs. time curves (AUCs), were used to evaluate bioequivalence. The two preparations were considered bioequivalent if the 90% confidence intervals for the ratio of geometric means for Cmax and AUCs fell within the bioequivalence window of 80% to 125%. RESULTS/CONCLUSION Results show that each BDDrFVIII formulation is bioequivalent to Hemofil M and the two formulations of BDDrFVIII are bioequivalent to each other.
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Affiliation(s)
- C M Kessler
- Georgetown University Medical Center, Washington, DC 20007-2197, USA.
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Moll S, Lindley C, Pescatore S, Morrison D, Tsuruta K, Mohri M, Serada M, Sata M, Shimizu H, Yamada K, White GC. Phase I study of a novel recombinant human soluble thrombomodulin, ART-123. J Thromb Haemost 2004; 2:1745-51. [PMID: 15456485 DOI: 10.1111/j.1538-7836.2004.00927.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Anticoagulants are often given for extended periods of time to patients at high risk for venous thromboembolism, such as after orthopedic surgery. Daily subcutaneous (sc) injections can be inconvenient to the patient. A long-acting anticoagulant requiring less frequent dosing could make treatment more acceptable. Thrombomodulin is a natural anticoagulant that activates protein C, which leads to inactivation of factor (F)Va and FVIIIa and decreased thrombin formation. Recombinant human thrombomodulin is a novel anticoagulant with a long half-life in animal models. METHODS AND RESULTS This phase I study examined pharmacokinetics, pharmacodynamics, and safety of recombinant human soluble thrombomodulin (ART-123) after administration of doses between 0.02 and 0.06 mg kg(-1) body weight intravenously (iv), and between 0.02 and 0.45 mg kg(-1) sc in 55 healthy volunteers. The plasma half-life was 2-3 days after sc injection of various single doses. Plasma ART-123 levels estimated to be needed for prevention of thrombus formation in humans were maintained for at least 6 days after single sc injection of 0.30 and 0.45 mg kg(-1) ART-123. Antithrombotic activity with these doses was demonstrated by achieving prothrombinase inhibition of more than 80% for more than 6 days after administration. No major bleeding occurred. Pharmacodynamic modeling revealed that adequate antithrombotic ART-123 levels can be achieved for 6 days with one dose of 0.45 mg kg(-1) ART-123, and for 12 days with 2 doses of 0.30 mg kg(-1), given 5 days apart. CONCLUSIONS Recombinant human soluble thrombomodulin (ART-123) has a long half-life after sc injection and is well tolerated, making it a suitable agent to be tested in clinical thromboprophylaxis trials.
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Affiliation(s)
- S Moll
- University of North Carolina School of Medicine, Department of Medicine, Division of Hematology-Oncology, Chapel Hill, NC 27599, USA.
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Abstract
Recombinant factor VIIa was initially developed for the treatment of hemorrhagic episodes in hemophilic patients with inhibitors to factors VIII and IX. After its introduction, it has also been used "off-label" to enhance hemostasis in nonhemophilic patients who experience bleeding episodes not responsive to conventional therapy. Evidence so far indicates that the use of factor VIIa in hemophilic patients with inhibitors is both safe and effective. Anecdotal reports also suggest that the product is safe and effective in controlling bleeding in nonhemophilic patients. However, its use in these conditions has not been approved by the FDA, and conclusive evidence of its effectiveness from controlled clinical trials is not yet available. Several questions pertaining to the use of factor VIIa require further investigation, including the mechanism of action; the optimal dose; definitive indications; ultimate safety; and laboratory tests for monitoring therapy.
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Affiliation(s)
- Harold R Roberts
- Division of Hematology/Oncology, Department of Medicine and the Carolina Cardiovascular Biology Center, 932 Mary Ellen Jones Bldg, Chapel Hill, NC 27599-7035, USA.
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49
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Abstract
Intracranial pseudotumour has rarely been reported in haemophilia. We present the fourth case describing this complication.
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Affiliation(s)
- E N Libby
- Department of Internal Medicine, University of New Mexico Hospital, Albuquerque, NM 87131, USA.
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Gidwitz S, Temple B, White GC. Mutations in and near the second calcium-binding domain of integrin alphaIIb affect the structure and function of integrin alphaIIbbeta3. Biochem J 2004; 379:449-59. [PMID: 14670082 PMCID: PMC1224065 DOI: 10.1042/bj20030615] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2003] [Revised: 12/10/2003] [Accepted: 12/11/2003] [Indexed: 11/17/2022]
Abstract
Calcium-binding domains in the alpha-subunit of integrins contain a central loop structure. To examine the importance of the loop structure, a series of alphaIIb mutants containing changes to the calcium-liganding amino acids have been constructed. Significantly, none of the mutant alphaIIbbeta3 complexes was detected on the surface of transfected cells, but mutant pro-alphaIIb was detected in cell lysates in complex with beta3. To study the importance of the regions flanking the second calcium-binding domain for ligand-binding and ligand-binding specificity, three alphaIIb/alpha5 chimaeras containing alpha5 sequences flanking or flanking and including the second calcium-binding domain were constructed. The chimaera containing both alpha5-flanking regions was not expressed on the cell surface, but FR1 and FR2, substituting either the first or second flanking region, were expressed. FR1beta3-transfected cells lost the ability to adhere to fibrinogen and to support aggregation and had minimal fibrinogen-binding ability. The heterodimer complex was less stable than the wild-type. FR2beta3-transfected cells adhered to fibrinogen and bound soluble fibrinogen with higher affinity when compared with wild-type. In addition, the heterodimer complex was more stable than wild-type. These results indicate that the conformation of the second calcium-binding domain is critical for maturation of the alphaIIbbeta3 complex and expression on the cell surface and that the surrounding sequences are critical for alphaIIbbeta3 function.
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Affiliation(s)
- Susan Gidwitz
- Division of Hematology and Oncology, Department of Medicine, Center for Thrombosis and Hemostasis, University of North Carolina, Chapel Hill, NC 27599-7035, USA.
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