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Colberg L, Cammann C, Wesche J, Topfstedt E, Seifert U, Greinacher A. The platelet proteasome and immunoproteasome are stable in buffy-coat derived platelet concentrates for up to 7 days. Transfusion 2021; 61:2746-2755. [PMID: 34331776 DOI: 10.1111/trf.16605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 06/20/2021] [Accepted: 06/27/2021] [Indexed: 01/19/2023]
Abstract
OBJECTIVES Characterization of the proteasome and its stability in buffy-coat derived platelet concentrates (PCs) during storage. BACKGROUND The proteasome plays a key role in cell homeostasis by processing misfolded or abnormal proteins and regulating the levels and activities of a high number of proteins contributing to cell cycle, survival, and proliferation. Controversial data exist, whether inhibition of the proteasome affects platelet function. Little is known about function, expression, and stability of the proteasome in PCs during storage, and the potential role of the platelet proteasome in storage lesions. STUDY DESIGN AND METHODS PCs were produced by the buffy-coat method in additive solution and stored at room temperature under agitation. Platelet aggregation was monitored by light transmission aggregometry. Proteasome complexes were assessed by immunoprecipitation and immunoblotting, and proteasome activity was measured using fluorogenic substrates specific for the three different proteolytic activities over 7 days of storage. RESULTS Proteasome inhibition led to a decreased platelet aggregation response after activation with collagen, ADP, TRAP-6, and thrombin. There were no changes in the expression of the catalytic active subunits as well as the proteasome activity during storage of PCs, comparing baseline and day 7. DISCUSSION Platelet proteasome function is relevant for platelet aggregation in response to various agonists. The constitutive and stable expression of the active standard- and immunoproteasome in platelets makes it unlikely that loss of proteasome function is a relevant cause of storage lesions.
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Affiliation(s)
- Lisa Colberg
- Institut für Immunologie und Transfusionsmedizin, Universitätsmedizin Greifswald, Greifswald, Germany.,Friedrich Loeffler-Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Clemens Cammann
- Friedrich Loeffler-Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Jan Wesche
- Institut für Immunologie und Transfusionsmedizin, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Eylin Topfstedt
- Friedrich Loeffler-Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Ulrike Seifert
- Friedrich Loeffler-Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Andreas Greinacher
- Institut für Immunologie und Transfusionsmedizin, Universitätsmedizin Greifswald, Greifswald, Germany
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2
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El-Kadiry AEH, Merhi Y. The Role of the Proteasome in Platelet Function. Int J Mol Sci 2021; 22:ijms22083999. [PMID: 33924425 PMCID: PMC8069084 DOI: 10.3390/ijms22083999] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 02/06/2023] Open
Abstract
Platelets are megakaryocyte-derived acellular fragments prepped to maintain primary hemostasis and thrombosis by preserving vascular integrity. Although they lack nuclei, platelets harbor functional genomic mediators that bolster platelet activity in a signal-specific manner by performing limited de novo protein synthesis. Furthermore, despite their limited protein synthesis, platelets are equipped with multiple protein degradation mechanisms, such as the proteasome. In nucleated cells, the functions of the proteasome are well established and primarily include proteostasis among a myriad of other signaling processes. However, the role of proteasome-mediated protein degradation in platelets remains elusive. In this review article, we recapitulate the developing literature on the functions of the proteasome in platelets, discussing its emerging regulatory role in platelet viability and function and highlighting how its functional coupling with the transcription factor NF-κB constitutes a novel potential therapeutic target in atherothrombotic diseases.
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Affiliation(s)
- Abed El-Hakim El-Kadiry
- Laboratory of Thrombosis and Hemostasis, Montreal Heart Institute, Research Centre, Montreal, QC H1T 1C8, Canada;
- Biomedical Sciences Program, Faculty of Medicine, Université de Montréal, Montreal, QC H3T 1J4, Canada
| | - Yahye Merhi
- Laboratory of Thrombosis and Hemostasis, Montreal Heart Institute, Research Centre, Montreal, QC H1T 1C8, Canada;
- Biomedical Sciences Program, Faculty of Medicine, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Correspondence: ; Tel.: +1-514-376-3330
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3
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Ling S, Jin L, Li S, Zhang F, Xu Q, Liu M, Chen X, Liu X, Gu J, Liu S, Liu N, Ou W. Allium macrostemon Saponin Inhibits Activation of Platelet via the CD40 Signaling Pathway. Front Pharmacol 2021; 11:570603. [PMID: 33584257 PMCID: PMC7874237 DOI: 10.3389/fphar.2020.570603] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 11/27/2020] [Indexed: 12/18/2022] Open
Abstract
Allium macrostemon saponin is a traditional Chinese medicine that exhibits anti-atherosclerosis effects. However, the mechanism of its action has not been fully clarified. Platelet activation induced by CD40L plays an important role in the process of atherosis. In the present study, we demonstrate for the first time that A. macrostemon saponin inhibits platelet activation induced by CD40L. Moreover, the effects of saponin on platelet activation were achieved by activation of the classical CD40L-associated pathway, including the PI3K/Akt, MAPK and NF-κB proteins. In addition, the present study further demonstrated that saponin exhibited an effect on the TRAF2-mediated ubiquitination degradation, which contributed to the inhibition of the CD40 pathway and its downstream members. The findings determine that A. macrostemon saponin inhibits activation of platelets via activation of downstream proteins of the CD40 pathway. This in turn affected TRAF2-associated ubiquitination degradation and caused an anti-thrombotic effect.
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Affiliation(s)
- Sisi Ling
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Lijun Jin
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Shizheng Li
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Fangcheng Zhang
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Qiong Xu
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Mingke Liu
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Xuke Chen
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Xiaolin Liu
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Jielei Gu
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Shiming Liu
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Ningning Liu
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Wenchao Ou
- Department of Cardiology, Guangdong Key Laboratory of Vascular Diseases, State Key Laboratory of Respiratory Disease, Guangzhou Institute of Cardiovascular Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
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4
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Colberg L, Cammann C, Greinacher A, Seifert U. Structure and function of the ubiquitin-proteasome system in platelets. J Thromb Haemost 2020; 18:771-780. [PMID: 31898400 DOI: 10.1111/jth.14730] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 12/30/2019] [Indexed: 12/16/2022]
Abstract
Platelets are small anucleate blood cells with a life span of 7 to 10 days. They are main regulators of hemostasis. Balanced platelet activity is crucial to prevent bleeding or occlusive thrombus formation. Growing evidence supports that platelets also participate in immune reactions, and interaction between platelets and leukocytes contributes to both thrombosis and inflammation. The ubiquitin-proteasome system (UPS) plays a key role in maintaining cellular protein homeostasis by its ability to degrade non-functional self-, foreign, or short-lived regulatory proteins. Platelets express standard and immunoproteasomes. Inhibition of the proteasome impairs platelet production and platelet function. Platelets also express major histocompatibility complex (MHC) class I molecules. Peptide fragments released by proteasomes can bind to MHC class I, which makes it also likely that platelets can activate epitope specific cytotoxic T lymphocytes (CTLs). In this review, we focus on current knowledge on the significance of the proteasome for the functions of platelets as critical regulators of hemostasis as well as modulators of the immune response.
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Affiliation(s)
- Lisa Colberg
- Friedrich Loeffler Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
- Institut für Immunologie und Transfusionsmedizin, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Clemens Cammann
- Friedrich Loeffler Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Andreas Greinacher
- Institut für Immunologie und Transfusionsmedizin, Universitätsmedizin Greifswald, Greifswald, Germany
| | - Ulrike Seifert
- Friedrich Loeffler Institut für Medizinische Mikrobiologie-Virologie, Universitätsmedizin Greifswald, Greifswald, Germany
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5
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Vallance TM, Ravishankar D, Albadawi DAI, Layfield H, Sheard J, Vaiyapuri R, Dash P, Patel K, Widera D, Vaiyapuri S. Effect of ultrapure lipopolysaccharides derived from diverse bacterial species on the modulation of platelet activation. Sci Rep 2019; 9:18258. [PMID: 31796818 PMCID: PMC6890654 DOI: 10.1038/s41598-019-54617-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 11/18/2019] [Indexed: 11/09/2022] Open
Abstract
Platelets are small circulating blood cells that play essential roles in the maintenance of haemostasis via blood clotting. However, they also play critical roles in the regulation of innate immune responses. Inflammatory receptors, specifically Toll-like receptor (TLR)-4, have been reported to modify platelet reactivity. A plethora of studies have reported controversial functions of TLR4 in the modulation of platelet function using various chemotypes and preparations of its ligand, lipopolysaccharide (LPS). The method of preparation of LPS may explain these discrepancies however this is not fully understood. Hence, to determine the impact of LPS on platelet activation, we used ultrapure preparations of LPS from Escherichia coli (LPSEC), Salmonella minnesota (LPSSM), and Rhodobacter sphaeroides (LPSRS) and examined their actions under diverse experimental conditions in human platelets. LPSEC did not affect platelet activation markers such as inside-out signalling to integrin αIIbβ3 or P-selectin exposure upon agonist-induced activation in platelet-rich plasma or whole blood whereas LPSSM and LPSRS inhibited platelet activation under specific conditions at supraphysiological concentrations. Overall, our data demonstrate that platelet activation is not largely influenced by any of the ultrapure LPS chemotypes used in this study on their own except under certain conditions.
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Affiliation(s)
- Thomas M Vallance
- School of Pharmacy, University of Reading, Reading, RG6 6UB, United Kingdom
| | | | - Dina A I Albadawi
- School of Pharmacy, University of Reading, Reading, RG6 6UB, United Kingdom
| | - Harry Layfield
- School of Pharmacy, University of Reading, Reading, RG6 6UB, United Kingdom
| | - Jonathan Sheard
- Stem Cell Biology and Regenerative Medicine Group, School of Pharmacy, University of Reading, Reading, RG6 6UB, United Kingdom.,Sheard BioTech Ltd, 20-22, Wenlock Road, London, N1 7GU, United Kingdom
| | | | - Philip Dash
- School of Biological Sciences, University of Reading, Reading, RG6 6UB, United Kingdom
| | - Ketan Patel
- School of Biological Sciences, University of Reading, Reading, RG6 6UB, United Kingdom
| | - Darius Widera
- Stem Cell Biology and Regenerative Medicine Group, School of Pharmacy, University of Reading, Reading, RG6 6UB, United Kingdom
| | - Sakthivel Vaiyapuri
- School of Pharmacy, University of Reading, Reading, RG6 6UB, United Kingdom.
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Kojok K, Akoum SE, Mohsen M, Mourad W, Merhi Y. CD40L Priming of Platelets via NF-κB Activation is CD40- and TAK1-Dependent. J Am Heart Assoc 2019; 7:e03677. [PMID: 30571597 PMCID: PMC6405550 DOI: 10.1161/jaha.118.009636] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Background CD40 ligand (CD40L) is a thromboinflammatory molecule that predicts cardiovascular events. CD40L is a strong activator of nuclear factor kappa B (NF‐κB) in platelets that primes and enhances platelet activation in response to thrombotic stimuli. In addition to its classical receptor CD40, CD40L binds αIIbβ3, α5β1, and αMβ2 in various cell types. However, the function of the different CD40L receptors on platelets remains unexplored. The present study aims to identify the receptors of CD40L, involved in platelet NF‐κB activation, their downstream signaling and their implication in platelet aggregation. Methods and Results We showed that platelets express CD40, αIIbβ3, and α5β1 and release CD40L in response to sCD40L stimulation. sCD40L alone dose‐dependently induced platelet NF‐κB activation; this effect was absent in CD40−/− mouse platelets and inhibited by the CD40 blockade, but was unaffected by the αIIbβ3 or α5β1 blockade in human platelets. sCD40L/CD40 axis activates transforming growth factor‐β‐activated kinase 1 upstream of NF‐κB. In functional studies, sCD40L alone did not affect platelet aggregation but potentiated the aggregation response in the presence of suboptimal doses of thrombin; this effect was abolished by CD40, transforming growth factor‐β‐activated kinase 1, and NF‐κB inhibitors. Conclusions CD40L primes platelets via signaling pathways involving CD40/transforming growth factor‐β‐activated kinase 1/NF‐κB, which predisposes platelets to enhanced activation and aggregation in response to thrombotic stimuli.
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Affiliation(s)
- Kevin Kojok
- 1 Laboratory of Thrombosis and Hemostasis Montreal Heart Institute, Research Centre Montreal QC Canada.,2 Faculty of Medicine Université de Montréal QC Canada
| | - Souhad El Akoum
- 1 Laboratory of Thrombosis and Hemostasis Montreal Heart Institute, Research Centre Montreal QC Canada.,2 Faculty of Medicine Université de Montréal QC Canada
| | - Mira Mohsen
- 1 Laboratory of Thrombosis and Hemostasis Montreal Heart Institute, Research Centre Montreal QC Canada.,2 Faculty of Medicine Université de Montréal QC Canada
| | - Walid Mourad
- 2 Faculty of Medicine Université de Montréal QC Canada.,3 Research Centre Centre Hospitalier de l'Université de Montréal QC Canada
| | - Yahye Merhi
- 1 Laboratory of Thrombosis and Hemostasis Montreal Heart Institute, Research Centre Montreal QC Canada.,2 Faculty of Medicine Université de Montréal QC Canada
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7
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Paez Espinosa EV, Lin OA, Karim ZA, Alshbool FZ, Khasawneh FT. Mouse transient receptor potential channel type 6 selectively regulates agonist-induced platelet function. Biochem Biophys Rep 2019; 20:100685. [PMID: 31508510 PMCID: PMC6726914 DOI: 10.1016/j.bbrep.2019.100685] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 08/27/2019] [Accepted: 08/27/2019] [Indexed: 01/20/2023] Open
Abstract
While changes in intracellular calcium levels is a central step in platelet activation and thrombus formation, the contribution and mechanism of receptor-operated calcium entry (ROCE) via transient receptor potential channels (TRPCs) in platelets remains poorly defined. In previous studies, we have shown that TRPC6 regulates hemostasis and thrombosis, in mice. In the present studies, we employed a knockout mouse model system to characterize the role of TRPC6 in ROCE and platelet activation. It was observed that the TRPC6 deletion (Trpc6−/−) platelets displayed impaired elevation of intracellular calcium, i.e., defective ROCE. Moreover, these platelets also exhibited defects in a host of functional responses, namely aggregation, granule secretion, and integrin αIIbβ3. Interestingly, the aforementioned defects were specific to the thromboxane receptor (TPR), as no impaired responses were observed in response to ADP or the thrombin receptor-activating peptide 4 (TRAP4). The defect in ROCE in the Trpc6−/− was also observed with 1-oleoyl-2-acetyl-sn-glycerol (OAG). Finally, our studies also revealed that TRPC6 regulates clot retraction. Taken together, our findings demonstrate that TRPC6 directly regulates TPR-dependent ROCE and platelet function. Thus, TRPC6 may serve as a novel target for the therapeutic management of thrombotic diseases. TRPC6 regulates TPR-mediated/receptor-operated calcium entry. TRPC6 regulates TPR-dependent platelet aggregation, secretion and integrin activation. TRPC6 regulates clot retraction. TRPC6 expression levels are age-dependent in platelets.
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Affiliation(s)
| | | | - Zubair A Karim
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
| | - Fatima Z Alshbool
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
| | - Fadi T Khasawneh
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX, 79902, USA
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8
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Role of NF-κB in Platelet Function. Int J Mol Sci 2019; 20:ijms20174185. [PMID: 31461836 PMCID: PMC6747346 DOI: 10.3390/ijms20174185] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 08/25/2019] [Accepted: 08/26/2019] [Indexed: 01/04/2023] Open
Abstract
Platelets are megakaryocyte-derived fragments lacking nuclei and prepped to maintain primary hemostasis by initiating blood clots on injured vascular endothelia. Pathologically, platelets undergo the same physiological processes of activation, secretion, and aggregation yet with such pronouncedness that they orchestrate and make headway the progression of atherothrombotic diseases not only through clot formation but also via forcing a pro-inflammatory state. Indeed, nuclear factor-κB (NF-κB) is largely implicated in atherosclerosis and its pathological complication in atherothrombotic diseases due to its transcriptional role in maintaining pro-survival and pro-inflammatory states in vascular and blood cells. On the other hand, we know little on the functions of platelet NF-κB, which seems to function in other non-genomic ways to modulate atherothrombosis. Therein, this review will resemble a rich portfolio for NF-κB in platelets, specifically showing its implications at the levels of platelet survival and function. We will also share the knowledge thus far on the effects of active ingredients on NF-κB in general, as an extrapolative method to highlight the potential therapeutic targeting of NF-κB in coronary diseases. Finally, we will unzip a new horizon on a possible extra-platelet role of platelet NF-κB, which will better expand our knowledge on the etiology and pathophysiology of atherothrombosis.
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Feng J, Yang W, Wang J, Pu Z, Han Y, Wan L. Z-VRPR-FMK can inhibit the growth and invasiveness of diffuse large B-cell lymphoma by depressing NF-κB activation and MMP expression induced by MALT1. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2019; 12:1947-1955. [PMID: 31934017 PMCID: PMC6949647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 04/18/2019] [Indexed: 06/10/2023]
Abstract
This study aimed to investigate the therapeutic effect of the mucosa-associated lymphoid tissue lymphoma translocation gene 1 (MALT1) on diffuse large B-cell lymphoma (DLBCL) and its underlying molecular mechanism through the application of Z-Val-Arg-Pro-DL-Arg-fluoromethyl ketone (Z-VRPR-FMK). Cultured OCI-LY10 cells and their xenografts in nude mice were treated with Z-VRPR-FMK. The growth and invasiveness of the tumor were observed. The components of the NF-κB signaling pathways, such as P65, MALT1, A20, matrix metalloproteinase 2 (MMP2) and MMP9, were detected using a real-time fluorescent quantitative polymerase chain reaction, immunohistochemical staining, and a Western blot analysis. Z-VRPR-FMK inhibited the growth and invasiveness of OCI-LY10 cells and their xenografts. The increase in the tumor volume was slower in the experimental group than it was in the control group, and the weight of the nude mice was significantly different between the two groups on the 11th and 13th days of treatment. The expression of P65 was significantly lower at the gene level in cultured OCI-LY10 cells and transplanted tumors than in the controls after treatment with Z-VRPR-FMK. The nuclear expression of the P65 protein of xenografts also decreased, but the nuclear expression of the A20 protein followed a reverse pattern. The expressions of the MALT1, MMP2, and MMP9 proteins were lower in the OCI-LY10 cells and transplanted tumors treated with Z-VRPR-FMK compared with the controls. This study indicates that MALT1 might serve as an effective therapeutic target for activated B-cell (ABC)-like DLBCL. Z-VRPR-FMK inhibits the growth and invasiveness of ABC-like DLBCL by depressing the proteolysis of A20, the activation of NF-κB, and the expression of MMP9 and MMP2 induced by the MALT1 protein.
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Affiliation(s)
- Jianglong Feng
- Department of Pathology, Affiliated Hospital, Guizhou Medical UniversityGuiyang 550001, Guizhou, China
| | - Wenxiu Yang
- Department of Pathology, Affiliated Hospital, Guizhou Medical UniversityGuiyang 550001, Guizhou, China
| | - Jiarui Wang
- Department of Pathology, Maternal and Child Health Hospital of Guiyang CityGuiyang, Guizhou, China
| | - Zhenhong Pu
- Department of Pathology, Affiliated Hospital, Guizhou Medical UniversityGuiyang 550001, Guizhou, China
| | - Ying Han
- Department of Pathology, Guizhou Medical UniversityGuiyang 550025, Guizhou, China
| | - Long Wan
- Department of Pathology, Guizhou Medical UniversityGuiyang 550025, Guizhou, China
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10
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SHARPIN at the nexus of integrin, immune, and inflammatory signaling in human platelets. Proc Natl Acad Sci U S A 2019; 116:4983-4988. [PMID: 30804189 DOI: 10.1073/pnas.1819156116] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Platelets mediate primary hemostasis, and recent work has emphasized platelet participation in immunity and inflammation. The function of the platelet-specific integrin αIIbβ3 as a fibrinogen receptor in hemostasis is well defined, but the roles of αIIbβ3 or integrin-associated proteins in nonhemostatic platelet functions are poorly understood. Here we show that human platelets express the integrin-associated protein SHARPIN with functional consequences. In leukocytes, SHARPIN interacts with integrin α cytoplasmic tails, and it is also an obligate member of the linear ubiquitin chain assembly complex (LUBAC), which mediates Met1 linear ubiquitination of proteins leading to canonical NF-κB activation. SHARPIN interacted with αIIb in pull-down and coimmunoprecipitation assays. SHARPIN was partially localized, as was αIIbβ3, at platelet edges, and thrombin stimulation induced more central SHARPIN localization. SHARPIN also coimmunoprecipitated from platelets with the two other proteins comprising LUBAC, the E3 ligase HOIP and HOIL-1. Platelet stimulation with thrombin or inflammatory agonists, including lipopolysaccharide or soluble CD40 ligand (sCD40L), induced Met1 linear ubiquitination of the NF-κB pathway protein NEMO and serine-536 phosphorylation of the p65 RelA subunit of NF-κB. In human megakaryocytes and/or platelets derived from induced pluripotent stem (iPS) cells, SHARPIN knockdown caused increased basal and agonist-induced fibrinogen binding to αIIbβ3 as well as reduced Met1 ubiquitination and RelA phosphorylation. Moreover, these SHARPIN knockdown cells exhibited increased surface expression of MHC class I molecules and increased release of sCD40L. These results establish that SHARPIN functions in the human megakaryocyte/platelet lineage through protein interactions at the nexus of integrin and immune/inflammatory signaling.
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11
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Sun J, Zhang M, Chen K, Chen B, Zhao Y, Gong H, Zhao X, Qi R. Suppression of TLR4 activation by resveratrol is associated with STAT3 and Akt inhibition in oxidized low-density lipoprotein-activated platelets. Eur J Pharmacol 2018; 836:1-10. [DOI: 10.1016/j.ejphar.2018.08.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 08/08/2018] [Accepted: 08/10/2018] [Indexed: 12/17/2022]
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12
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Karim ZA, Hensch NR, Qasim H, Alshbool FZ, Khasawneh FT. Role of IκB kinase β in regulating the remodeling of the CARMA1-Bcl10-MALT1 complex. Biochem Biophys Res Commun 2018; 500:268-274. [PMID: 29649481 DOI: 10.1016/j.bbrc.2018.04.057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 04/09/2018] [Indexed: 01/26/2023]
Abstract
The current work investigates the notion that inducible clustering of signaling mediators of the IKK pathway is important for platelet activation. Thus, while the CARMA1, Bcl10, and MALT1 (CBM) complex is essential for triggering IKK/NF-κB activation upon platelet stimulation, the signals that elicit its formation and downstream effector activation remain elusive. We demonstrate herein that IKKβ is involved in membrane fusion, and serves as a critical protein kinase required for initial formation and the regulation of the CARMA1/MALT1/Bcl10/CBM complex in platelets. We also show that IKKβ regulates these processes via modulation of phosphorylation of Bcl10 and IKKγ polyubiquitination. Collectively, our data demonstrate that IKKβ regulates membrane fusion and the remodeling of the CBM complex formation.
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Affiliation(s)
- Zubair A Karim
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA.
| | - Nicole R Hensch
- The University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Hanan Qasim
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
| | - Fatima Z Alshbool
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
| | - Fadi T Khasawneh
- 1101 N. Campbell St, Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
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13
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Toll-Like Receptor 4 Signalling and Its Impact on Platelet Function, Thrombosis, and Haemostasis. Mediators Inflamm 2017; 2017:9605894. [PMID: 29170605 PMCID: PMC5664350 DOI: 10.1155/2017/9605894] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 08/17/2017] [Accepted: 09/12/2017] [Indexed: 11/18/2022] Open
Abstract
Platelets are anucleated blood cells that participate in a wide range of physiological and pathological functions. Their major role is mediating haemostasis and thrombosis. In addition to these classic functions, platelets have emerged as important players in the innate immune system. In particular, they interact with leukocytes, secrete pro- and anti-inflammatory factors, and express a wide range of inflammatory receptors including Toll-like receptors (TLRs), for example, Toll-like receptor 4 (TLR4). TLR4, which is the most extensively studied TLR in nucleated cells, recognises lipopolysaccharides (LPS) that are compounds of the outer surface of Gram-negative bacteria. Unlike other TLRs, TLR4 is able to signal through both the MyD88-dependent and MyD88-independent signalling pathways. Notably, despite both pathways culminating in the activation of transcription factors, TLR4 has a prominent functional impact on platelet activity, haemostasis, and thrombosis. In this review, we summarise the current knowledge on TLR4 signalling in platelets, critically discuss its impact on platelet function, and highlight the open questions in this area.
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Zhang Y, Dai J, Tang J, Zhou L, Zhou M. MicroRNA-649 promotes HSV-1 replication by directly targeting MALT1. J Med Virol 2016; 89:1069-1079. [DOI: 10.1002/jmv.24728] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/01/2016] [Indexed: 12/12/2022]
Affiliation(s)
- Yi Zhang
- Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, College of Food and Pharmaceutical Engineering; Hubei University of Technology; Wuhan China
| | - Jun Dai
- Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, College of Food and Pharmaceutical Engineering; Hubei University of Technology; Wuhan China
| | - Jinfeng Tang
- Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, College of Food and Pharmaceutical Engineering; Hubei University of Technology; Wuhan China
| | - Li Zhou
- ABSL-III Laboratory at Center for Animal Experiment, State Key Laboratory of Virology; Wuhan University School of Medicine; Wuhan China
| | - Mengzhou Zhou
- Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, College of Food and Pharmaceutical Engineering; Hubei University of Technology; Wuhan China
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Grundler K, Rotter R, Tilley S, Pircher J, Czermak T, Yakac M, Gaitzsch E, Massberg S, Krötz F, Sohn HY, Pohl U, Mannell H, Kraemer BF. The proteasome regulates collagen-induced platelet aggregation via nuclear-factor-kappa-B (NFĸB) activation. Thromb Res 2016; 148:15-22. [PMID: 27768934 DOI: 10.1016/j.thromres.2016.10.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/05/2016] [Accepted: 10/11/2016] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Platelets possess critical hemostatic functions in the system of thrombosis and hemostasis, which can be affected by a multitude of external factors. Previous research has shown that platelets have the capacity to synthesize proteins de novo and more recently a multicatalytic protein complex, the proteasome, has been discovered in platelets. Due to its vital function for cellular integrity, the proteasome has become a therapeutic target for anti-proliferative drug therapies in cancer. Clinically thrombocytopenia is a frequent side-effect, but the aggregatory function of platelets also appears to be affected. Little is known however about underlying regulatory mechanisms and functional aspects of proteasome inhibition on platelets. Our study aims to investigate the role of the proteasome in regulating collagen-induced platelet aggregation and its interaction with NFkB in this context. MATERIAL AND METHODS Using fluorescence activity assays, platelet aggregometry and immunoblotting, we investigate regulatory interactions of the proteasome and Nuclear-factor-kappa-B (NFkB) in collagen-induced platelet aggregation. RESULTS We show that collagen induces proteasome activation in platelets and collagen-induced platelet aggregation can be reduced with proteasome inhibition by the specific inhibitor epoxomicin. This effect does not depend on Rho-kinase/ROCK activation or thromboxane release, but rather depends on NFkB activation. Inhibition of the proteasome prevented cleavage of NFκB-inhibitor protein IκBα and decreased NFκB activity after collagen stimulation. Inhibition of the NFκB-pathway in return reduced collagen-induced platelet proteasome activity and cleavage of proteasome substrates. CONCLUSIONS This work offers novel explanations how the proteasome influences collagen-dependent platelet aggregation by involving non-genomic functions of NFkB.
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Affiliation(s)
- Katharina Grundler
- Walter Brendel-Zentrum, Ludwig-Maximilians Universitaet Muenchen, Schillerstr. 44, 80336 Muenchen, Gemany; Medizinische Klinik und Poliklinik I, Klinikum der Universitaet Muenchen, Ziemssenstr. 1, 80336 Muenchen, Germany
| | - Raffaela Rotter
- Walter Brendel-Zentrum, Ludwig-Maximilians Universitaet Muenchen, Schillerstr. 44, 80336 Muenchen, Gemany
| | - Sloane Tilley
- Walter Brendel-Zentrum, Ludwig-Maximilians Universitaet Muenchen, Schillerstr. 44, 80336 Muenchen, Gemany
| | - Joachim Pircher
- Medizinische Klinik und Poliklinik I, Klinikum der Universitaet Muenchen, Ziemssenstr. 1, 80336 Muenchen, Germany
| | - Thomas Czermak
- Medizinische Klinik und Poliklinik I, Klinikum der Universitaet Muenchen, Ziemssenstr. 1, 80336 Muenchen, Germany
| | - Mustaf Yakac
- Medizinische Klinik und Poliklinik I, Klinikum der Universitaet Muenchen, Ziemssenstr. 1, 80336 Muenchen, Germany
| | - Erik Gaitzsch
- Walter Brendel-Zentrum, Ludwig-Maximilians Universitaet Muenchen, Schillerstr. 44, 80336 Muenchen, Gemany
| | - Steffen Massberg
- Medizinische Klinik und Poliklinik I, Klinikum der Universitaet Muenchen, Ziemssenstr. 1, 80336 Muenchen, Germany; DZHK (German Center for Cardiovascular Research) partner site Munich Heart Alliance, Munich, Germany
| | - Florian Krötz
- Klinikum Starnberg, Osswaldstr.1, 82319 Starnberg, Germany
| | - Hae-Young Sohn
- MediCenter Germering, Hartstr. 52, 82110 Germering, Germany
| | - Ulrich Pohl
- Walter Brendel-Zentrum, Ludwig-Maximilians Universitaet Muenchen, Schillerstr. 44, 80336 Muenchen, Gemany; DZHK (German Center for Cardiovascular Research) partner site Munich Heart Alliance, Munich, Germany
| | - Hanna Mannell
- Walter Brendel-Zentrum, Ludwig-Maximilians Universitaet Muenchen, Schillerstr. 44, 80336 Muenchen, Gemany
| | - Bjoern F Kraemer
- Medizinische Klinik und Poliklinik I, Klinikum der Universitaet Muenchen, Ziemssenstr. 1, 80336 Muenchen, Germany.
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Koessler J, Etzel J, Weber K, Boeck M, Kobsar A. Evaluation of dose-dependent effects of the proteasome inhibitor bortezomib in human platelets. Eur J Pharmacol 2016; 791:99-104. [PMID: 27568836 DOI: 10.1016/j.ejphar.2016.08.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/25/2016] [Accepted: 08/25/2016] [Indexed: 01/06/2023]
Abstract
Platelets express key proteins of the proteasome system and contain protein ubiquitination pathways. The functional role of the proteasome system in platelets, however, is still subject of studies. In addition to its role as anticancer drug, the potent and selective proteasome inhibitor bortezomib can be used for experimental proteasome research. Since it is mandatory to know exact dose-effect relationships, we intended to evaluate dose-dependent specific bortezomib effects on basal and on agonist-induced proteasome activitiy, on levels of poly-ubiquitinated proteins and on platelet aggregation. In washed platelets, unstimulated or stimulated with different agonists and pre-incubated with various bortezomib concentrations, the proteasome activity was determined by a fluorometric assay. The levels of poly-ubiquitinated proteins were assessed by an immunoassay kit. Platelet aggregation was measured by light transmission aggregometry in platelet-rich-plasma. Platelet agonists stimulate both, the proteasome activity and the accumulation of poly-ubiquitinated proteins in platelets. Bortezomib inhibits the basal and the agonist induced proteasome activity and increased the content of poly-ubiquitinated proteins in a concentration dependent manner. Bortezomib concentrations in the nM-range causing complete blockade of platelet proteasome activity do not affect agonist induced platelet aggregation, indicating that the level of platelet proteasome activity is not directly linked with the induction of platelet aggregation. Bortezomib in the µM-range may tamper platelet aggregation, possibly due to unspecific and toxic effects.
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Affiliation(s)
- Juergen Koessler
- Institute of Transfusion Medicine and Haemotherapy, University of Wuerzburg, Oberduerrbacher Straße 6, D-97080 Wuerzburg, Germany.
| | - Julia Etzel
- Institute of Transfusion Medicine and Haemotherapy, University of Wuerzburg, Oberduerrbacher Straße 6, D-97080 Wuerzburg, Germany.
| | - Katja Weber
- Institute of Transfusion Medicine and Haemotherapy, University of Wuerzburg, Oberduerrbacher Straße 6, D-97080 Wuerzburg, Germany.
| | - Markus Boeck
- Institute of Transfusion Medicine and Haemotherapy, University of Wuerzburg, Oberduerrbacher Straße 6, D-97080 Wuerzburg, Germany.
| | - Anna Kobsar
- Institute of Transfusion Medicine and Haemotherapy, University of Wuerzburg, Oberduerrbacher Straße 6, D-97080 Wuerzburg, Germany.
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Karim ZA, Alshbool FZ, Vemana HP, Conlon C, Druey KM, Khasawneh FT. CXCL12 regulates platelet activation via the regulator of G-protein signaling 16. BIOCHIMICA ET BIOPHYSICA ACTA 2016; 1863:314-21. [PMID: 26628381 PMCID: PMC10983798 DOI: 10.1016/j.bbamcr.2015.11.028] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 10/27/2015] [Accepted: 11/24/2015] [Indexed: 01/17/2023]
Abstract
The regulators of G protein signaling (RGS) protein superfamily negatively controls G protein-coupled receptor signal transduction pathways. One of the members of this family, RGS16, is highly expressed in megakaryocytes and platelets. Studies of its function in platelet and megakaryocyte biology have been limited, in part, due to lack of pharmacological inhibitors. For example, RGS16 overexpression inhibited CXC chemokine receptor 4 (CXCR4)-mediated megakaryocyte migration. More recent studies showed that the chemokine stromal cell-derived factor (SDF1α or CXCL12) regulates platelet function via CXCR4. Based on these considerations, the present study investigated the capacity of RGS16 to regulate CXCL12-dependent platelet function, using the RGS16 knockout mouse model (Rgs16(-/-)). RGS16-deficient platelets had increased protease activated receptor 4 and collagen-induced aggregation, as well as increased CXCL12-dependent agonist-induced aggregation, dense and alpha granule secretion, integrin αIIbβ3 activation and phosphatidylserine exposure compared to those from WT littermates. CXCL12 alone did not stimulate aggregation or secretion in either RGS16-deficient or WT platelets. Furthermore, platelets from Rgs16(-/-) mice displayed enhanced phosphorylation of ERK and Akt following CXCL12 stimulation relative to controls. Finally, we also found that PKCδ is involved in regulating CXCL12-dependent activation of ERK and Akt, in the Rgs16-deficient platelets. Collectively, our findings provide the first evidence that RGS16 plays an important role in platelet function by modulating CXCL12-dependent platelet activation.
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Affiliation(s)
- Zubair A Karim
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA 91766, USA
| | - Fatima Z Alshbool
- Department of Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Hari Priya Vemana
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA 91766, USA
| | - Christine Conlon
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA 91766, USA
| | - Kirk M Druey
- Molecular Signal Transduction Section, Laboratory of Allergic Diseases, NIAID/NIH, 50 South Drive Room 4154, Bethesda, MD 20892, USA
| | - Fadi T Khasawneh
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA 91766, USA.
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