1
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Hui T, Yiling J, Guangqun C, Ran L, Hui L, Lan Y, Jie H, Su Q. Diallyl disulfide downregulating RhoGDI2 induces differentiation and inhibit invasion via the Rac1/Pak1/LIMK1 pathway in human leukemia HL-60 cells. ENVIRONMENTAL TOXICOLOGY 2023; 38:1063-1077. [PMID: 36793247 DOI: 10.1002/tox.23748] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/30/2022] [Accepted: 01/16/2023] [Indexed: 06/18/2023]
Abstract
Leukemia is a type of disease in which hematopoietic stem cells proliferate clonally at the genetic level. We discovered previously by high-resolution mass spectrometry that diallyl disulfide (DADS), which is one of the effective ingredients of garlic, reduces the performance of RhoGDI2 from APL HL-60 cells. Although RhoGDI2 is oversubscribed in several cancer categories, the effect of RhoGDI2 in HL-60 cells has remained unexplained. We aimed to investigate the influence of RhoGDI2 on DADS-induced differentiation of HL-60 cells to elucidate the association among the effect of inhibition or over-expression of RhoGDI2 with HL-60 cell polarization, migration and invasion, which is important for establishing a novel generation of inducers to elicit leukemia cell polarization. Co-transfection with RhoGDI2-targeted miRNAs apparently decreases the malignant biological behavior of cells and upregulates cytopenias in DADS-treated HL-60 cell lines, which increases CD11b and decreases CD33 and mRNA levels of Rac1, PAK1 and LIMK1. Meanwhile, we generated HL-60 cell lines with high-expressing RhoGDI2. The proliferation, migration and invasion capacity of such cells were significantly increased by the treated with DADS, while the reduction capacity of the cells was decreased. There was a reduction in CD11b and an increase in CD33 production, as well as an increase in the mRNA levels of Rac1, PAK1 and LIMK1. It also confirmed that inhibition of RhoGDI2 attenuates the EMT cascade via the Rac1/Pak1/LIMK1 pathway, thereby inhibiting the malignant biological behavior of HL-60 cells. Thus, we considered that inhibition of RhoGDI2 expression might be a new therapeutic direction for the treatment of human promyelocytic leukemia. The anti-cancer property of DADS against HL-60 leukemia cells might be regulated by RhoGDI2 through the Rac1-Pak1-LIMK1 pathway, which provides new evidence for DADS as a clinical anti-cancer medicine.
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Affiliation(s)
- Tan Hui
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
| | - Jiang Yiling
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
- Department of Oncology, First Affiliated Hospital, University of South China, Hengyang, China
| | - Chen Guangqun
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
- Department of Oncology, Loudi Central Hospital, Loudi, China
| | - Liu Ran
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
- Department of Pathology, The First Hospital of Changsha, Changsha, China
| | - Ling Hui
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
| | - Yi Lan
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
| | - He Jie
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
| | - Qi Su
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, Hengyang, China
- Department of Oncology, First Affiliated Hospital, University of South China, Hengyang, China
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2
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The Dual Function of RhoGDI2 in Immunity and Cancer. Int J Mol Sci 2023; 24:ijms24044015. [PMID: 36835422 PMCID: PMC9960019 DOI: 10.3390/ijms24044015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/10/2023] [Accepted: 02/14/2023] [Indexed: 02/19/2023] Open
Abstract
RhoGDI2 is a guanine nucleotide dissociation inhibitor (GDI) specific for the Rho family of small GTPases. It is highly expressed in hematopoietic cells but is also present in a large array of other cell types. RhoGDI2 has been implicated in multiple human cancers and immunity regulation, where it can display a dual role. Despite its involvement in various biological processes, we still do not have a clear understanding of its mechanistic functions. This review sheds a light on the dual opposite role of RhoGDI2 in cancer, highlights its underappreciated role in immunity and proposes ways to explain its intricate regulatory functions.
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3
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Kowluru A, Gleason NF. Underappreciated roles for Rho GDP dissociation inhibitors (RhoGDIs) in cell function: Lessons learned from the pancreatic islet β-cell. Biochem Pharmacol 2022; 197:114886. [PMID: 34968495 PMCID: PMC8858860 DOI: 10.1016/j.bcp.2021.114886] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/10/2021] [Accepted: 12/13/2021] [Indexed: 11/02/2022]
Abstract
Rho subfamily of G proteins (e.g., Rac1) have been implicated in glucose-stimulated insulin secretion from the pancreatic β-cell. Interestingly, metabolic stress (e.g., chronic exposure to high glucose) results in sustained activation of Rac1 leading to increased oxidative stress, impaired insulin secretion and β-cell dysfunction. Activation-deactivation of Rho G proteins is mediated by three classes of regulatory proteins, namely the guanine nucleotide exchange factors (GEFs), which facilitate the conversion of inactive G proteins to their active conformations; the GTPase-activating proteins (GAPs), which convert the active G proteins to their inactive forms); and the GDP-dissociation inhibitors (GDIs), which prevent the dissociation of GDP from G proteins. Contrary to a large number of GEFs (82 members) and GAPs (69 members), only three members of RhoGDIs (RhoGDIα, RhoGDIβ and RhoGDIγ) are expressed in mammalian cells.Even though relatively smaller in number, the GDIs appear to play essential roles in G protein function (e.g., subcellular targeting) for effector activation and cell regulation. Emerging evidence also suggests that the GDIs are functionally regulated via post-translational modification (e.g., phosphorylation) and by lipid second messengers, lipid kinases and lipid phosphatases. We highlight the underappreciated regulatory roles of RhoGDI-Rho G protein signalome in islet β-cell function in health and metabolic stress. Potential knowledge gaps in the field, and directions for future research for the identification of novel therapeutic targets to loss of functional β-cell mass under the duress of metabolic stress are highlighted.
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Affiliation(s)
- Anjaneyulu Kowluru
- Biomedical Research Service, John D. Dingell VA Medical Center and Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI 48201, USA.
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4
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Zheng TJ, Lofurno ER, Melrose AR, Lakshmanan HHS, Pang J, Phillips KG, Fallon ME, Kohs TCL, Ngo ATP, Shatzel JJ, Hinds MT, McCarty OJT, Aslan JE. Assessment of the effects of Syk and BTK inhibitors on GPVI-mediated platelet signaling and function. Am J Physiol Cell Physiol 2021; 320:C902-C915. [PMID: 33689480 DOI: 10.1152/ajpcell.00296.2020] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Spleen tyrosine kinase (Syk) and Bruton's tyrosine kinase (BTK) play critical roles in platelet physiology, facilitating intracellular immunoreceptor tyrosine-based activation motif (ITAM)-mediated signaling downstream of platelet glycoprotein VI (GPVI) and GPIIb/IIIa receptors. Small molecule tyrosine kinase inhibitors (TKIs) targeting Syk and BTK have been developed as antineoplastic and anti-inflammatory therapeutics and have also gained interest as antiplatelet agents. Here, we investigate the effects of 12 different Syk and BTK inhibitors on GPVI-mediated platelet signaling and function. These inhibitors include four Syk inhibitors, Bay 61-3606, R406 (fostamatinib), entospletinib, TAK-659; four irreversible BTK inhibitors, ibrutinib, acalabrutinib, ONO-4059 (tirabrutinib), AVL-292 (spebrutinib); and four reversible BTK inhibitors, CG-806, BMS-935177, BMS-986195, and fenebrutinib. In vitro, TKIs targeting Syk or BTK reduced platelet adhesion to collagen, dense granule secretion, and alpha granule secretion in response to the GPVI agonist cross-linked collagen-related peptide (CRP-XL). Similarly, these TKIs reduced the percentage of activated integrin αIIbβ3 on the platelet surface in response to CRP-XL, as determined by PAC-1 binding. Although all TKIs tested inhibited phospholipase C γ2 (PLCγ2) phosphorylation following GPVI-mediated activation, other downstream signaling events proximal to phosphoinositide 3-kinase (PI3K) and PKC were differentially affected. In addition, reversible BTK inhibitors had less pronounced effects on GPIIb/IIIa-mediated platelet spreading on fibrinogen and differentially altered the organization of PI3K around microtubules during platelets spreading on fibrinogen. Select TKIs also inhibited platelet aggregate formation on collagen under physiological flow conditions. Together, our results suggest that TKIs targeting Syk or BTK inhibit central platelet functional responses but may differentially affect protein activities and organization in critical systems downstream of Syk and BTK in platelets.
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Affiliation(s)
- Tony J Zheng
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | - Elizabeth R Lofurno
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | - Alexander R Melrose
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon
| | | | - Jiaqing Pang
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | | | - Meghan E Fallon
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | - Tia C L Kohs
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | - Anh T P Ngo
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | - Joseph J Shatzel
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon.,Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, Oregon
| | - Monica T Hinds
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon
| | - Owen J T McCarty
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon.,Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, Oregon.,Department of Cell, Developmental and Cancer Biology, Oregon Health & Science University, Portland, Oregon
| | - Joseph E Aslan
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon.,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon.,Department of Chemical Physiology and Biochemistry, School of Medicine, Oregon Health & Science University, Portland, Oregon
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5
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Ngo ATP, Parra-Izquierdo I, Aslan JE, McCarty OJT. Rho GTPase regulation of reactive oxygen species generation and signalling in platelet function and disease. Small GTPases 2021; 12:440-457. [PMID: 33459160 DOI: 10.1080/21541248.2021.1878001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
Platelets are master regulators and effectors of haemostasis with increasingly recognized functions as mediators of inflammation and immune responses. The Rho family of GTPase members Rac1, Cdc42 and RhoA are known to be major components of the intracellular signalling network critical to platelet shape change and morphological dynamics, thus playing a major role in platelet spreading, secretion and thrombus formation. Initially linked to the regulation of actomyosin contraction and lamellipodia formation, recent reports have uncovered non-canonical functions of platelet RhoGTPases in the regulation of reactive oxygen species (ROS), where intrinsically generated ROS modulate platelet function and contribute to thrombus formation. Platelet RhoGTPases orchestrate oxidative processes and cytoskeletal rearrangement in an interconnected manner to regulate intracellular signalling networks underlying platelet activity and thrombus formation. Herein we review our current knowledge of the regulation of platelet ROS generation by RhoGTPases and their relationship with platelet cytoskeletal reorganization, activation and function.
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Affiliation(s)
- Anh T P Ngo
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA
| | - Ivan Parra-Izquierdo
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA.,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Joseph E Aslan
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA.,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon, USA.,Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, Portland, Oregon, USA
| | - Owen J T McCarty
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA
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6
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Effect of the Rho GTPase inhibitor-1 on the entry of dengue serotype 2 virus into EAhy926 cells. Mol Biol Rep 2020; 47:9739-9747. [PMID: 33200314 DOI: 10.1007/s11033-020-05980-9] [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: 05/21/2020] [Accepted: 11/05/2020] [Indexed: 02/06/2023]
Abstract
Dengue virus (DV) is the most rapidly spreading arbovirus in the world. Our previous studies indicated that Rac1, a kind of Rho GTPase, was related with the increased vascular permeability in DV infection. However, the molecular mechanisms that regulate the activity of the Rac1 pathway during DV infection is not fully understood yet. Recently, Rho-specific guanine nucleotide dissociated inhibitors (Rho GDIs), as a pivotal upstream regulator of Rho GTPase, attract our attention. To identify the role of GDI-1 in DV2 infection, the expression of GDI in Eahy926 cells was detected. Moreover, a GDI-1 down-regulated cell line was constructed to explore the correlation between GDI-1 and Rac1 and to further evaluate the function of GDI in DV life cycle. Our results indicated that DV2 infection could up-regulate GDI-1 expression, and down-regulation of GDI enhanced the activity of Rac1. In addition, down-regulated GDI-1 significantly inhibited all steps of DV2 replication cycle. GDI-1 plays an important role in DV2 infection via negatively regulating the activation of the Rac1-actin pathway. These results not only contribute to our further understanding of the pathogenesis of severe dengue but also provide further insight into the development of antiviral drugs.
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7
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The PKC universe keeps expanding: From cancer initiation to metastasis. Adv Biol Regul 2020; 78:100755. [PMID: 33017725 DOI: 10.1016/j.jbior.2020.100755] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/15/2020] [Accepted: 09/18/2020] [Indexed: 02/08/2023]
Abstract
Classical and novel protein kinase C (PKC) isozymes (c/nPKCs), members of the PKC family that become activated by the lipid second messenger diacylglycerol (DAG) and phorbol esters, exert a myriad of cellular effects that impact proliferative and motile cellular responses. While c/nPKCs have been indisputably associated with tumor promotion, their roles exceed by far their sole involvement as promoter kinases. Indeed, this original dogma has been subsequently redefined by the introduction of several new concepts: the identification of tumor suppressing roles for c/nPKCs, and their participation in early and late stages of carcinogenesis. This review dives deep into the intricate roles of c/nPKCs in cancer initiation as well as in the different stages of the metastatic cascade, with great emphasis in their involvement in cancer cell motility via regulation of small Rho GTPases, the production of extracellular matrix (ECM)-degrading proteases, and the epithelial-to-mesenchymal transition (EMT) program required for the acquisition of highly invasive traits. Here, we highlight functional interplays between either PKCα or PKCε and mesenchymal features that may ultimately contribute to anticancer drug resistance in cellular and animal models. We also introduce the novel hypothesis that c/nPKCs may be implicated in the control of immune evasion through the regulation of immune checkpoint protein expression. In summary, dissecting the colossal complexity of c/nPKC signaling in the wide spectrum of cancer progression may bring new opportunities for the development of meaningful tools aiding for cancer prognosis and therapy.
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8
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Tamburrino D, Guarneri G, Pagnanelli M, Crippa S, Partelli S, Belfiori G, Capurso G, Falconi M. Chemopreventive Agents After Pancreatic Resection for Ductal Adenocarcinoma: Legend or Scientific Evidence? Ann Surg Oncol 2020; 28:2312-2322. [PMID: 32920722 DOI: 10.1245/s10434-020-09097-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 08/16/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND Pancreatic ductal adenocarcinoma (PDAC) is currently the fourth leading cause of cancer-related death in the USA. A wealth of evidence has demonstrated the chemopreventive activity of aspirin, statins, and metformin against PDAC. The aim of this study is to investigate the effect of aspirin, statins, and metformin on disease-free survival (DFS) and disease-specific survival (DSS) in a large population of PDAC patients undergoing pancreatic resection. PATIENTS AND METHODS All patients who underwent pancreatic resections between January 2015 and September 2018 were retrospectively reviewed. The potentially "chemopreventive agents" considered for the analysis were aspirin, statins, and metformin. Drug use was defined in case of regular assumption at least 6 months before diagnosis and regularly after surgery along the follow-up period. RESULTS A total of 430 patients were enrolled in this study, with median DFS and DSS of 21 months (IQR 13-30) months and 34 (IQR 26-52) months, respectively. On multivariable analysis, use of aspirin was associated with better DFS (HR: 0.62; p = 0.038). Metformin was associated with better DFS, without reaching statistical significance (p = 0.083). Use of statins did not influence DFS in the studied population. Aspirin, metformin, and statins were not associated with better DSS on multivariable analysis. Factors influencing DSS were pT3/pT4, N1, N2, no adjuvant treatment, G3, and ASA score > 3. CONCLUSIONS The results suggest that chronic use of aspirin is associated with increased DFS but not with better DSS after surgical resection in patients with PDAC.
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Affiliation(s)
- Domenico Tamburrino
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy
| | - Giovanni Guarneri
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy
| | - Michele Pagnanelli
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy
| | - Stefano Crippa
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy.,Vita-Salute San Raffaele University, Milan, Italy
| | - Stefano Partelli
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy.,Vita-Salute San Raffaele University, Milan, Italy
| | - Giulio Belfiori
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy
| | - Gabriele Capurso
- Pancreato-Biliary Endoscopy and Endosonography Division, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy
| | - Massimo Falconi
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Center, San Raffaele Scientific Institute IRCCS, Vita-Salute San Raffaele University, Milan, Italy. .,Vita-Salute San Raffaele University, Milan, Italy.
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9
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Liu YZ, Xiao X, Hu CT, Dai Y, Qu SL, Huang L, Zhang C. SUMOylation in atherosclerosis. Clin Chim Acta 2020; 508:228-233. [DOI: 10.1016/j.cca.2020.05.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 05/15/2020] [Accepted: 05/15/2020] [Indexed: 12/31/2022]
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10
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Zeng Y, Ren M, Li Y, Liu Y, Chen C, Su J, Su B, Xia H, Liu F, Jiang H, Ling H, Zeng X, Su Q. Knockdown of RhoGDI2 represses human gastric cancer cell proliferation, invasion and drug resistance via the Rac1/Pak1/LIMK1 pathway. Cancer Lett 2020; 492:136-146. [PMID: 32860848 DOI: 10.1016/j.canlet.2020.07.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 07/03/2020] [Accepted: 07/10/2020] [Indexed: 02/06/2023]
Abstract
Gastric cancer (GC) is the fifth most common primary malignancy in humans. Rho GDP dissociation inhibitor 2 (RhoGDI2) is overexpressed in multiple cancer types, but the role of RhoGDI2 in GC has not been elucidated. This study aims to determine the level of RhoGDI2 in GC and to confirm the effect of its inhibition or overexpression on GC cell migration, invasion and chemosensitivity. RhoGDI2 level is significantly enhanced in human GC tissue samples in comparison with normal gastric epithelium and corresponding para-cancerous samples. The expression of RhoGDI2 is correlated with clinicopathological parameters and prognosis. Transfection in combination with miRNA targeting of RhoGDI2 in GC cell lines remarkably downregulates GC cell migration and invasion and reduces the mRNA levels of Rac1, Pak1 and LIMK1. The inhibition of RhoGDI2 downregulates GC cell migration and invasion by attenuating the EMT cascade via the Rac1/Pak1/LIMK1 pathway. Knockdown of RhoGDI2 is a potential therapeutic strategy for GC.
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Affiliation(s)
- Ying Zeng
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China; School of Nursing, University of South China, China
| | - Mei Ren
- Center for Gastric Cancer Research of Hunan Province, First Affiliated Hospital, University of South China, China
| | - Yukun Li
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China
| | - Yanli Liu
- Center for Gastric Cancer Research of Hunan Province, First Affiliated Hospital, University of South China, China
| | - Cong Chen
- Center for Gastric Cancer Research of Hunan Province, First Affiliated Hospital, University of South China, China
| | - Jian Su
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China; Department of Pathology, Second Affiliated Hospital, University of South China, China
| | - Bo Su
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China; Key Laboratory for Pharmacoproteomics of Hunan Provincial University, Institute of Pharmacy and Pharmacology, University of South China, China
| | - Hong Xia
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China
| | - Fang Liu
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China
| | - Hao Jiang
- Center for Gastric Cancer Research of Hunan Province, First Affiliated Hospital, University of South China, China
| | - Hui Ling
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China
| | - Xi Zeng
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China; Center for Gastric Cancer Research of Hunan Province, First Affiliated Hospital, University of South China, China.
| | - Qi Su
- Hunan Province Key Laboratory of Cancer Cellular and Molecular Pathology, Cancer Research Institute, University of South China, China; Center for Gastric Cancer Research of Hunan Province, First Affiliated Hospital, University of South China, China.
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11
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Bäckström A, Kugel L, Gnann C, Xu H, Aslan JE, Lundberg E, Stadler C. A Sample Preparation Protocol for High Throughput Immunofluorescence of Suspension Cells on an Adherent Surface. J Histochem Cytochem 2020; 68:473-489. [PMID: 32564662 PMCID: PMC7350080 DOI: 10.1369/0022155420935403] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Imaging is a powerful approach for studying protein expression and has the advantage over other methodologies in providing spatial information in situ at single cell level. Using immunofluorescence and confocal microscopy, detailed information of subcellular distribution of proteins can be obtained. While adherent cells of different tissue origin are relatively easy to prepare for imaging applications, non-adherent cells from hematopoietic origin, present a challenge due to their poor attachment to surfaces and subsequent loss of a substantial fraction of the cells. Still, these cell types represent an important part of the human proteome and express genes that are not expressed in adherent cell types. In the era of cell mapping efforts, overcoming the challenge with suspension cells for imaging applications would enable systematic profiling of hematopoietic cells. In this work, we successfully established an immunofluorescence protocol for preparation of suspension cell lines, peripheral blood mononucleated cells (PBMC) and human platelets on an adherent surface. The protocol is based on a multi-well plate format with automated sample preparation, allowing for robust high throughput imaging applications. In combination with confocal microscopy, the protocol enables systematic exploration of protein localization to all major subcellular structures.
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Affiliation(s)
- Anna Bäckström
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
| | - Laura Kugel
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
| | - Christian Gnann
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
| | - Hao Xu
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
| | - Joseph E Aslan
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
| | - Emma Lundberg
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
| | - Charlotte Stadler
- Department of Protein Science, Royal Institute of Technology, Stockholm, Sweden (AB, LK, CG, HX, EL, CS).,Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon (JEA)
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12
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Golding AE, Visco I, Bieling P, Bement WM. Extraction of active RhoGTPases by RhoGDI regulates spatiotemporal patterning of RhoGTPases. eLife 2019; 8:e50471. [PMID: 31647414 PMCID: PMC6910828 DOI: 10.7554/elife.50471] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/23/2019] [Indexed: 01/03/2023] Open
Abstract
The RhoGTPases are characterized as membrane-associated molecular switches that cycle between active, GTP-bound and inactive, GDP-bound states. However, 90-95% of RhoGTPases are maintained in a soluble form by RhoGDI, which is generally viewed as a passive shuttle for inactive RhoGTPases. Our current understanding of RhoGTPase:RhoGDI dynamics has been limited by two experimental challenges: direct visualization of the RhoGTPases in vivo and reconstitution of the cycle in vitro. We developed methods to directly image vertebrate RhoGTPases in vivo or on lipid bilayers in vitro. Using these methods, we identified pools of active and inactive RhoGTPase associated with the membrane, found that RhoGDI can extract both inactive and active RhoGTPases, and found that extraction of active RhoGTPase contributes to their spatial regulation around cell wounds. These results indicate that RhoGDI directly contributes to the spatiotemporal patterning of RhoGTPases by removing active RhoGTPases from the plasma membrane.
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Affiliation(s)
- Adriana E Golding
- Graduate Program in Cell and Molecular BiologyUniversity of WisconsinMadisonUnited States
| | - Ilaria Visco
- Department of Systemic Cell BiologyMax Planck Institute of Molecular PhysiologyDortmundGermany
| | - Peter Bieling
- Department of Systemic Cell BiologyMax Planck Institute of Molecular PhysiologyDortmundGermany
| | - William M Bement
- Laboratory of Cell and Molecular BiologyUniversity of Wisconsin-MadisonMadisonUnited States
- Department of Integrative BiologyUniversity of Wisconsin-MadisonMadisonUnited States
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13
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Thamilselvan V, Kowluru A. Paradoxical regulation of glucose-induced Rac1 activation and insulin secretion by RhoGDIβ in pancreatic β-cells. Small GTPases 2019; 12:114-121. [PMID: 31267831 DOI: 10.1080/21541248.2019.1635403] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Small GTPases (e.g., Rac1) play key roles in glucose-stimulated insulin secretion (GSIS) in the β-cell. We investigated regulation by RhoGDIβ of glucose-induced activation of Rac1 and insulin secretion. RhoGDIβ is expressed in INS-1 832/13 cells, rodent and human islets. siRNA-mediated knockdown of RhoGDIβ in INS-1 832/13 cells significantly attenuated glucose-induced Rac1 activation without affecting its translocation and membrane association. Further, suppression of RhoGDIβ expression exerted minimal effects on GSIS at the height of inhibition of Rac1 activation, suggesting divergent effects of RhoGDIβ on Rac1 activation and insulin secretion in the glucose-stimulated β-cell. We provide the first evidence for the expression of RhoGDIβ in rodent and human β-cells, and its differential regulatory roles of this protein in G protein activation and GSIS. Abbreviations: Arf6: ADP ribosylation factor; Cdc42: Cell Division Cycle; GAP: GTPase-activating protein; GDI: GDP dissociation inhibitor; GDIα: GDP dissociation inhibitorα; GDIβ: GDP dissociation inhibitorβ; GEF: Guanine nucleotide exchange factor; GSIS: Glucose-stimulated insulin secretion; Rac1: Ras-Related C3 Botulinum Toxin Substrate 1.
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Affiliation(s)
- Vijayalakshmi Thamilselvan
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University , Detroit, USA
| | - Anjaneyulu Kowluru
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University , Detroit, USA.,Center for Translational Research in Diabetes, Biomedical Research Service, John D. Dingell VA Medical Center , Detroit, MI, USA
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14
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Liu W, Wang X, Wang S, Ba X, Xu T, Wang X, Zeng X. RhoGDI2 positively regulates the Rho GTPases activation in response to the β2 outside-in signaling in T cells adhesion and migration on ICAM-1. J Leukoc Biol 2019; 106:431-446. [PMID: 31075185 DOI: 10.1002/jlb.2a0718-272rr] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 04/25/2019] [Accepted: 04/30/2019] [Indexed: 01/08/2023] Open
Abstract
Cytoskeletal reorganization driven by Rho GTPases plays a crucial role in the migration of T cells, which are key regulators of immunity. The molecular mechanisms that control actin cytoskeleton remodeling during T cell movement have only partially been clarified as the function of many modulators has not been evaluated in these cells. Here, we report a new function of RhoGDI2 by showing that this protein positively regulates Rho GTPase activation during T cell adhesion and migration. RhoGDI2 knockdown significantly reduced T cell adhesion and migration. Furthermore, RhoGDI2 knockdown decreased the activation of Rac1 and Cdc42, 2 members of Rho GTPases, and the remodeling of the actin cytoskeleton. Upon P-selectin glycoprotein ligand-1 engagement, RhoGDI2 was phosphorylated at Y24 and Y153 by kinases related to β2 integrin outside-in signaling, Src, c-Abl, and Syk, resulting in the accumulation of RhoGDI2 at the cell membrane. Subsequent phosphorylation of S31 induced the opening of RhoGDI2 and the release of Rho GTPases, whereas phosphorylation of Y153 might promote the activation of Rho GTPases by recruiting Vav1. Moreover, the disruption of lipid rafts with methyl-β-cyclodextrin blocked the interaction between integrins and RhoGDI2, reducing the level of phosphorylated RhoGDI2 and the activation of downstream Rho GTPases. Based on these observations, RhoGDI2 is a target of intergrin outside-in signaling that activates Rho GTPases during T cell adhesion and migration, and RhoGDI2-mediated signal transduction is based on the lipid rafts integrity.
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Affiliation(s)
- Wenai Liu
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Xuehao Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Shan Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Xueqing Ba
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Tingshuang Xu
- Department of Rheumatology and Immunology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Xiaoguang Wang
- Department of Bioscience, Changchun Normal University, Changchun, Jilin, China
| | - Xianlu Zeng
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
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15
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Ngo AT, Sheriff J, Rocheleau AD, Bucher M, Jones KR, Sepp ALI, Malone LE, Zigomalas A, Maloyan A, Bahou WF, Bluestein D, McCarty OJT, Haley KM. Assessment of neonatal, cord, and adult platelet granule trafficking and secretion. Platelets 2019; 31:68-78. [PMID: 30810440 PMCID: PMC6711836 DOI: 10.1080/09537104.2019.1573314] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 02/01/2019] [Accepted: 01/16/2019] [Indexed: 10/27/2022]
Abstract
Despite the transient hyporeactivity of neonatal platelets, full-term neonates do not display a bleeding tendency, suggesting potential compensatory mechanisms which allow for balanced and efficient neonatal hemostasis. This study aimed to utilize small-volume, whole blood platelet functional assays to assess the neonatal platelet response downstream of the hemostatic platelet agonists thrombin and adenosine diphosphate (ADP). Thrombin activates platelets via the protease-activated receptors (PARs) 1 and 4, whereas ADP signals via the receptors P2Y1 and P2Y12 as a positive feedback mediator of platelet activation. We observed that neonatal and cord blood-derived platelets exhibited diminished PAR1-mediated granule secretion and integrin activation relative to adult platelets, correlating to reduced PAR1 expression by neonatal platelets. PAR4-mediated granule secretion was blunted in neonatal platelets, correlating to lower PAR4 expression as compared to adult platelets, while PAR4 mediated GPIIb/IIIa activation was similar between neonatal and adult platelets. Under high shear stress, cord blood-derived platelets yielded similar thrombin generation rates but reduced phosphatidylserine expression as compared to adult platelets. Interestingly, we observed enhanced P2Y1/P2Y12-mediated dense granule trafficking in neonatal platelets relative to adults, although P2Y1/P2Y12 expression in neonatal, cord, and adult platelets were similar, suggesting that neonatal platelets may employ an ADP-mediated positive feedback loop as a potential compensatory mechanism for neonatal platelet hyporeactivity.
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Affiliation(s)
- Anh T.P. Ngo
- Department of Biomedical Engineering, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Jawaad Sheriff
- Department of Biomedical Engineering; Stony Brook
University, Stony Brook, NY, USA 11794
| | - Anne D. Rocheleau
- Department of Biomedical Engineering, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Matthew Bucher
- Knight Cardiovascular Institute, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
- Department of Obstetrics and Gynecology, Oregon Health
& Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Kendra R. Jones
- Department of Biomedical Engineering, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Anna-Liisa I. Sepp
- Department of Biomedical Engineering, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Lisa E. Malone
- Division of Hematology, Department of Medicine, Stony Brook
University, Stony Brook, NY, USA 11794
| | - Amanda Zigomalas
- Department of Biomedical Engineering; Stony Brook
University, Stony Brook, NY, USA 11794
| | - Alina Maloyan
- Knight Cardiovascular Institute, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
- Department of Obstetrics and Gynecology, Oregon Health
& Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Wadie F. Bahou
- Division of Hematology, Department of Medicine, Stony Brook
University, Stony Brook, NY, USA 11794
| | - Danny Bluestein
- Department of Biomedical Engineering; Stony Brook
University, Stony Brook, NY, USA 11794
| | - Owen J. T. McCarty
- Department of Biomedical Engineering, Oregon Health &
Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
| | - Kristina M. Haley
- The Hemophilia Center, Oregon Health & Science
University, 3181 SW Sam Jackson Park Rd, Portland, OR, USA 97239
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16
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Affiliation(s)
- Joseph E. Aslan
- Knight Cardiovascular Institute, School of Medicine, Oregon Health & Science University, Portland, Oregon, USA
- Department of Biochemistry and Molecular Biology, School of Medicine, Oregon Health & Science University, Portland, Oregon, USA
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, Oregon, USA
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17
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Babur Ö, Ngo ATP, Rigg RA, Pang J, Rub ZT, Buchanan AE, Mitrugno A, David LL, McCarty OJT, Demir E, Aslan JE. Platelet procoagulant phenotype is modulated by a p38-MK2 axis that regulates RTN4/Nogo proximal to the endoplasmic reticulum: utility of pathway analysis. Am J Physiol Cell Physiol 2018; 314:C603-C615. [PMID: 29412690 PMCID: PMC6008067 DOI: 10.1152/ajpcell.00177.2017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 02/05/2018] [Accepted: 02/05/2018] [Indexed: 01/01/2023]
Abstract
Upon encountering physiological cues associated with damaged or inflamed endothelium, blood platelets set forth intracellular responses to ultimately support hemostatic plug formation and vascular repair. To gain insights into the molecular events underlying platelet function, we used a combination of interactome, pathway analysis, and other systems biology tools to analyze associations among proteins functionally modified by reversible phosphorylation upon platelet activation. While an interaction analysis mapped out a relative organization of intracellular mediators in platelet signaling, pathway analysis revealed directional signaling relations around protein kinase C (PKC) isoforms and mitogen-activated protein kinases (MAPKs) associated with platelet cytoskeletal dynamics, inflammatory responses, and hemostatic function. Pathway and causality analysis further suggested that platelets activate a specific p38-MK2 axis to phosphorylate RTN4 (reticulon-4, also known as Nogo), a Bcl-xl sequestration protein and critical regulator of endoplasmic reticulum (ER) physiology. In vitro, we find that platelets drive a p38-MK2-RTN4-Bcl-xl pathway associated with the regulation of the ER and platelet phosphatidylserine exposure. Together, our results support the use of pathway tools in the analysis of omics data sets as a means to help generate novel, mechanistic, and testable hypotheses for platelet studies while uncovering RTN4 as a putative regulator of platelet cell physiological responses.
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Affiliation(s)
- Özgün Babur
- Department of Molecular and Medical Genetics, Oregon Health & Science University , Portland, Oregon
- Computational Biology Program, Oregon Health & Science University , Portland, Oregon
| | - Anh T P Ngo
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
| | - Rachel A Rigg
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
| | - Jiaqing Pang
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
| | - Zhoe T Rub
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
| | - Ariana E Buchanan
- Knight Cardiovascular Institute, School of Medicine, Oregon Health & Science University , Portland, Oregon
| | - Annachiara Mitrugno
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
| | - Larry L David
- Department of Biochemistry and Molecular Biology, Oregon Health & Science University , Portland, Oregon
| | - Owen J T McCarty
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
- Department of Cell, Developmental, & Cancer Biology, Oregon Health & Science University , Portland, Oregon
- Division of Hematology & Medical Oncology, Oregon Health & Science University , Portland, Oregon
| | - Emek Demir
- Department of Molecular and Medical Genetics, Oregon Health & Science University , Portland, Oregon
- Computational Biology Program, Oregon Health & Science University , Portland, Oregon
| | - Joseph E Aslan
- Department of Biochemistry and Molecular Biology, Oregon Health & Science University , Portland, Oregon
- Knight Cardiovascular Institute, School of Medicine, Oregon Health & Science University , Portland, Oregon
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18
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Ngo ATP, McCarty OJT, Aslan JE. TRPing out Platelet Calcium: TRPM7 (Transient Receptor Potential Melastatin-Like 7) Modulates Calcium Mobilization and Platelet Function via Phospholipase C Interactions. Arterioscler Thromb Vasc Biol 2018; 38:285-286. [PMID: 29367228 DOI: 10.1161/atvbaha.117.310493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Anh T P Ngo
- From the Department of Biomedical Engineering (A.T.P.N., O.J.T.M.), Department of Biochemistry and Molecular Biology (J.E.A.), and Knight Cardiovascular Institute (J.E.A.), School of Medicine, Oregon Health & Science University, Portland
| | - Owen J T McCarty
- From the Department of Biomedical Engineering (A.T.P.N., O.J.T.M.), Department of Biochemistry and Molecular Biology (J.E.A.), and Knight Cardiovascular Institute (J.E.A.), School of Medicine, Oregon Health & Science University, Portland
| | - Joseph E Aslan
- From the Department of Biomedical Engineering (A.T.P.N., O.J.T.M.), Department of Biochemistry and Molecular Biology (J.E.A.), and Knight Cardiovascular Institute (J.E.A.), School of Medicine, Oregon Health & Science University, Portland.
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19
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Garland KS, Reitsma SE, Shirai T, Zilberman-Rudenko J, Tucker EI, Gailani D, Gruber A, McCarty OJT, Puy C. Removal of the C-Terminal Domains of ADAMTS13 by Activated Coagulation Factor XI induces Platelet Adhesion on Endothelial Cells under Flow Conditions. Front Med (Lausanne) 2017; 4:232. [PMID: 29326937 PMCID: PMC5742325 DOI: 10.3389/fmed.2017.00232] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 12/04/2017] [Indexed: 01/20/2023] Open
Abstract
Platelet recruitment to sites of vascular injury is mediated by von Willebrand factor (VWF). The shear-induced unraveling of ultra-large VWF multimers causes the formation of a “stringlike” conformation, which rapidly recruits platelets from the bloodstream. A disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13 (ADAMTS13) regulates this process by cleaving VWF to prevent aberrant platelet adhesion; it is unclear whether the activity of ADAMTS13 itself is regulated. The serine proteases α-thrombin and plasmin have been shown to cleave ADAMTS13. Based on sequence homology, we hypothesized that activated coagulation factor XI (FXIa) would likewise cleave ADAMTS13. Our results show that FXIa cleaves ADAMTS13 at the C-terminal domains, generating a truncated ADAMTS13 with a deletion of part of the thrombospondin type-1 domain and the CUB1-2 domains, while α-thrombin cleaves ADAMTS13 near the CUB1-2 domains and plasmin cleaves ADAMTS13 at the metalloprotease domain and at the C-terminal domain. Using a cell surface immunoassay, we observed that FXIa induced the deletion of the CUB1-2 domains from ADAMTS13 on the surface of endothelial cells. Removal of the C-terminal domain of ADAMTS13 by FXIa or α-thrombin caused an increase in ADAMTS13 activity as measured by a fluorogenic substrate (FRETS) and blocked the ability of ADAMTS13 to cleave VWF on the endothelial cell surface, resulting in persistence of VWF strands and causing an increase in platelet adhesion under flow conditions. We have demonstrated a novel mechanism for coagulation proteinases including FXIa in regulating ADAMTS13 activity and function. This may represent an additional hemostatic function by which FXIa promotes local platelet deposition at sites of vessel injury.
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Affiliation(s)
- Kathleen S Garland
- Division of Pediatric Hematology/Oncology, School of Medicine, Oregon Health & Science University, Portland, OR, United States.,Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
| | - Stéphanie E Reitsma
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States.,Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Toshiaki Shirai
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
| | - Jevgenia Zilberman-Rudenko
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
| | - Erik I Tucker
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States.,Aronora, Inc., Portland, OR, United States
| | - David Gailani
- Vanderbilt University School of Medicine, Nashville, TN, United States
| | - András Gruber
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States.,Aronora, Inc., Portland, OR, United States
| | - Owen J T McCarty
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
| | - Cristina Puy
- Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
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