51
|
Wu X, Han X, Li L, Fan S, Zhuang P, Yang Z, Zhang Y. iTRAQ-based quantitative proteomics and target-fishing strategies reveal molecular signatures on vasodilation of Compound Danshen Dripping Pills. Chem Biol Interact 2019; 316:108923. [PMID: 31838051 DOI: 10.1016/j.cbi.2019.108923] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 11/26/2019] [Accepted: 12/10/2019] [Indexed: 10/25/2022]
Abstract
Angina pectoris can be used as an early warning for coronary artery disease. Vasodilation is an important mechanism of angina pectoris. Traditional Chinese medicine - Compound Danshen Dripping Pill (CDDP) is widely used to improve the symptoms of cardiovascular diseases (CVDs). To investigate the influence of vasodilation effect and underlying mechanisms of CDDP, we determined the vasodilation effect of thoracic aorta ring on rat induced by norepinephrine (NE). Then targets-fishing method was used to predict the potential mechanism of CDDP on vasodilation, based on the structures of the main components. Then, iTRAQ-based quantitative proteomics analysis was used for verification of the candidate target proteins and pathways to illustrate the underlying mechanisms. Furthermore, the differentially expressed proteins in the enriched pathways were validated by western blotting. In this study, we found that CDDP could significantly inhibit NE induced aortic contraction tension, and the mechanism may be related to platelet activation, cGMP - PKG signaling pathway and vascular smooth muscle contraction. The method provides a new way to uncover the vasodilation mechanism of CDDP, as well as other multi-component herbal medicines.
Collapse
Affiliation(s)
- Xin Wu
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, 300192, China
| | - Xiujiang Han
- Department of Cardiology, Tianjin Hospital of ITCWM Nankai Hospital, Tianjin, 300100, China
| | - Lili Li
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China
| | - Simiao Fan
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China
| | - Pengwei Zhuang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China
| | - Zhen Yang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Beijing University of Chinese Medicine, Beijing, 100029, China.
| | - Yanjun Zhang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China; Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China.
| |
Collapse
|
52
|
BAY 41-2272 inhibits human neutrophil functions. Int Immunopharmacol 2019; 75:105767. [PMID: 31376626 DOI: 10.1016/j.intimp.2019.105767] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 07/10/2019] [Accepted: 07/16/2019] [Indexed: 01/22/2023]
Abstract
BAY 41-2272 is a guanylyl cyclase (GC) stimulator derived from YC-1 (3-[(5'-hydroxymethyl-2'-furyl)-1-benzyl indazole]). Previous studies by our group showed that BAY 41-2272 activates human monocytes via soluble guanylyl cyclase (sGC) and cGMP. In this study, we investigated the effect of BAY 41-2272 on human neutrophil function and found that 30 μM BAY 41-2272 inhibits neutrophil migration (1.82-fold lower than FMLP, P < 0.05 by one-way ANOVA followed by Tukey's test), oxidative burst (1.70-fold lower than PMA, P < 0.05 by one-way ANOVA followed by Tukey's test), and IL-8 cytokine production (1.80-fold lower than PMA, P < 0.05 by one-way ANOVA followed by Tukey's test). Our results suggest that these effects are independent of the sGC pathway but dependent instead on cGMP production, as the response induced by 30 μM BAY 41-2272 was 6.40-fold greater than that observed in our negative control (P < 0.05 by parametric t-test). 1H-[1, 2, 4] oxadiazolo [4,3-a] quinoxalin-1-one (ODQ), which is an irreversible inhibitor of sGC, was unable to reverse the effects of BAY 41-2272 on human neutrophils, indicating that this drug acts independently of sGC. Our results confirm the immunomodulatory effect of BAY 41-2272 on human neutrophils.
Collapse
|
53
|
Rachubik P, Piwkowska A. The role of vasodilator‐stimulated phosphoprotein in podocyte functioning. Cell Biol Int 2019; 43:1092-1101. [DOI: 10.1002/cbin.11149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 04/06/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Patrycja Rachubik
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research CentrePolish Academy of Sciences Wita Stwosza 63, 80‐308 Gdańsk Poland
| | - Agnieszka Piwkowska
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research CentrePolish Academy of Sciences Wita Stwosza 63, 80‐308 Gdańsk Poland
| |
Collapse
|
54
|
Gau D, Veon W, Shroff SG, Roy P. The VASP-profilin1 (Pfn1) interaction is critical for efficient cell migration and is regulated by cell-substrate adhesion in a PKA-dependent manner. J Biol Chem 2019; 294:6972-6985. [PMID: 30814249 DOI: 10.1074/jbc.ra118.005255] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 02/22/2019] [Indexed: 12/20/2022] Open
Abstract
Dynamic regulation of the actin cytoskeleton is an essential feature of cell motility. Action of Enabled (Ena)/vasodilator-stimulated phosphoprotein (VASP), a family of conserved actin-elongating proteins, is an important aspect of regulation of the actin cytoskeletal architecture at the leading edge that controls membrane protrusion and cell motility. In this study, we performed mutagenesis experiments in overexpression and knockdown-rescue settings to provide, for the first time, direct evidence of the role of the actin-binding protein profilin1 (Pfn1) in VASP-mediated regulation of cell motility. We found that VASP's interaction with Pfn1 is promoted by cell-substrate adhesion and requires down-regulation of PKA activity. Our experimental data further suggest that PKA-mediated Ser137 phosphorylation of Pfn1 potentially negatively regulates the Pfn1-VASP interaction. Finally, Pfn1's ability to be phosphorylated on Ser137 was partly responsible for the anti-migratory action elicited by exposing cells to a cAMP/PKA agonist. On the basis of these findings, we propose a mechanism of adhesion-protrusion coupling in cell motility that involves dynamic regulation of Pfn1 by PKA activity.
Collapse
Affiliation(s)
- David Gau
- From the Department of Bioengineering, University of Pittsburgh and
| | - William Veon
- From the Department of Bioengineering, University of Pittsburgh and
| | - Sanjeev G Shroff
- From the Department of Bioengineering, University of Pittsburgh and
| | - Partha Roy
- From the Department of Bioengineering, University of Pittsburgh and .,the Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania 15219
| |
Collapse
|
55
|
Kameritsch P, Kiemer F, Mannell H, Beck H, Pohl U, Pogoda K. PKA negatively modulates the migration enhancing effect of Connexin 43. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2019; 1866:828-838. [PMID: 30769008 DOI: 10.1016/j.bbamcr.2019.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 01/31/2019] [Accepted: 02/01/2019] [Indexed: 12/22/2022]
Abstract
Connexin 43 (Cx43) expression is associated with an increased cell migration and related changes of the actin cytoskeleton (enhanced filopodia formation). These effects are mediated by the C-terminal cytoplasmic part of Cx43 in a channel-independent manner. Since this part has been shown to interact with a variety of proteins and has multiple phosphorylation sites we analyzed here a potential role of the protein kinase A (PKA) for the Cx43 mediated increase in cell migration. Mutation of the PKA-phosphorylation site (substitution of three serines by alanine or glycine) resulted in a further increase in cell motility compared to wild-type Cx43, but with a loss of directionality. Likewise, cell motility was enhanced by PKA inhibition only in Cx43 expressing cells, while reduced in the presence of the PKA activator forskolin. In contrast, cell motility remained unaffected by stimulation with forskolin in cells expressing Cx43 with the mutated PKA phosphorylation site (Cx43-PKA) as well as in Cx-deficient cells. Moreover, PKA activation resulted in increased binding of PKA and VASP to Cx43 associated with an enhanced phosphorylation of VASP, an important regulatory protein of cell polarity and directed migration. Functionally, we could confirm these results in endothelial cells endogenously expressing Cx43. A Tat-Cx43 peptide containing the PKA phosphorylation site abolished the PKA dependent reduction in endothelial cell migration. Our results indicate that PKA dependent phosphorylation of Cx43 modulates cell motility and plays a pivotal role in regulating directed cell migration.
Collapse
Affiliation(s)
- Petra Kameritsch
- Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-Universität München and Munich University Hospital, Großhaderner Str. 9, 82152 Planegg, Martinsried, Germany; DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Biedersteiner Str. 29, 80802 München, Germany.
| | - Felizitas Kiemer
- Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-Universität München and Munich University Hospital, Großhaderner Str. 9, 82152 Planegg, Martinsried, Germany.
| | - Hanna Mannell
- Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-Universität München and Munich University Hospital, Großhaderner Str. 9, 82152 Planegg, Martinsried, Germany.
| | - Heike Beck
- Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-Universität München and Munich University Hospital, Großhaderner Str. 9, 82152 Planegg, Martinsried, Germany.
| | - Ulrich Pohl
- Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-Universität München and Munich University Hospital, Großhaderner Str. 9, 82152 Planegg, Martinsried, Germany; DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Biedersteiner Str. 29, 80802 München, Germany; Munich Cluster for Systems Neurology (SyNergy), Feodor-Lynen-Str. 17, 81377 München, Germany.
| | - Kristin Pogoda
- Walter Brendel Centre of Experimental Medicine, Ludwig-Maximilians-Universität München and Munich University Hospital, Großhaderner Str. 9, 82152 Planegg, Martinsried, Germany; DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Biedersteiner Str. 29, 80802 München, Germany.
| |
Collapse
|
56
|
Signorello MG, Leoncini G. Anandamide Induces Platelet Nitric Oxide Synthase through AMP-Activated Protein Kinase. Lipids 2018; 53:851-861. [PMID: 30460698 DOI: 10.1002/lipd.12100] [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: 04/18/2018] [Revised: 09/04/2018] [Accepted: 10/08/2018] [Indexed: 12/30/2022]
Abstract
The objective of this study was to determine whether adenosine 5' monophosphate (AMP)-activated protein kinase (AMPK) is activated by anandamide (AEA) and is involved in endothelial nitric oxide synthase (eNOS) activation. We found that AEA stimulates and activates AMPKα through a Ca2+ -dependent/Calmodulin (CaM)-dependent pathway as the specific inhibitor of the Ca2+ /Calmodulin kinase kinase β (CaMKKβ) STO-609 abolishes the AMPK phosphorylation/activation. The same inhibiting effect is shown in platelets pretreated with LY294002, an inhibitor of phosphatidylinositol 3 kinase (PI3K), or with MK2206, an inhibitor of protein kinase B (AKT), suggesting that AMPK is downstream of the PI3K/AKT pathway. Moreover, the AEA-induced eNOS activation and the consequent nitric oxide (NO) and guanosine 3'-5' cyclic monophosphate (cGMP) increase are mediated by the CaMKKβ/AMPKα pathway as STO-609 significantly inhibits these parameters. In contrast, liver kinase B1 (LKB1) seems to be very poorly involved. One crucial effect of NO and cGMP elevation is the activation of protein kinase G that can phosphorylate the vasodilator-stimulated phosphoprotein (VASP). We have demonstrated that AEA stimulates VASP phosphorylation on both thr278 and ser239 that is strongly inhibited by STO-609, LY294002, and MK2206. Finally, AMPK phosphorylation/activation and VASP phosphorylation are significantly reduced by SR141716, the specific inhibitor of type 1 cannabinoid receptor (CB1). SR144528, an antagonist of type 2 cannabinoid receptor (CB2), has a less-potent effect, suggesting that the CB1 receptor is overall involved in the AEA effect. In conclusion, we show that the CaMKKβ/AMPKα pathway, downstream of the PI3K/AKT pathway, is activated by AEA in human platelets and leads to increase NO levels producing beneficial effects during ischemic conditions and contributing to extend platelet survival.
Collapse
Affiliation(s)
- Maria Grazia Signorello
- Department of Pharmacy, Biochemistry Lab, University of Genoa, Viale Benedetto XV 3, I-16132, Genoa, Italy
| | - Giuliana Leoncini
- Department of Pharmacy, Biochemistry Lab, University of Genoa, Viale Benedetto XV 3, I-16132, Genoa, Italy
| |
Collapse
|
57
|
Ali M, Heyob K, Tipple TE, Pryhuber GS, Rogers LK. Alterations in VASP phosphorylation and profilin1 and cofilin1 expression in hyperoxic lung injury and BPD. Respir Res 2018; 19:229. [PMID: 30463566 PMCID: PMC6249974 DOI: 10.1186/s12931-018-0938-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 11/12/2018] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Hyperoxia is a frequently employed therapy for prematurely born infants, induces lung injury and contributes to development of bronchopulmonary dysplasia (BPD). BPD is characterized by decreased cellular proliferation, cellular migration, and failure of injury repair systems. Actin binding proteins (ABPs) such as VASP, cofilin1, and profilin1 regulate cell proliferation and migration via modulation of actin dynamics. Lung mesenchymal stem cells (L-MSCs) initiate repair processes by proliferating, migrating, and localizing to sites of injury. These processes have not been extensively explored in hyperoxia induced lung injury and repair. METHODS ABPs and CD146+ L-MSCs were analyzed by immunofluorescence in human lung autopsy tissues from infants with and without BPD and by western blot in lung tissue homogenates obtained from our murine model of newborn hyperoxic lung injury. RESULTS Decreased F-actin content, ratio of VASPpS157/VASPpS239, and profilin 1 expression were observed in human lung tissues but this same pattern was not observed in lungs from hyperoxia-exposed newborn mice. Increases in cofilin1 expression were observed in both human and mouse tissues at 7d indicating a dysregulation in actin dynamics which may be related to altered growth. CD146 levels were elevated in human and newborn mice tissues (7d). CONCLUSION Altered phosphorylation of VASP and expression of profilin 1 and cofilin 1 in human tissues indicate that the pathophysiology of BPD involves dysregulation of actin binding proteins. Lack of similar changes in a mouse model of hyperoxia exposure imply that disruption in actin binding protein expression may be linked to interventions or morbidities other than hyperoxia alone.
Collapse
Affiliation(s)
- Mehboob Ali
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Cross Road, Columbus, OH, USA.
| | - Kathryn Heyob
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Cross Road, Columbus, OH, USA
| | - Trent E Tipple
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Gloria S Pryhuber
- Department of Pediatrics, University of Rochester Medical Center, Rochester, NY, USA
| | - Lynette K Rogers
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Cross Road, Columbus, OH, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH, USA
| |
Collapse
|
58
|
Wilton KM, Billadeau DD. VASP Regulates NK Cell Lytic Granule Convergence. THE JOURNAL OF IMMUNOLOGY 2018; 201:2899-2909. [PMID: 30282752 DOI: 10.4049/jimmunol.1800254] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 09/07/2018] [Indexed: 11/19/2022]
Abstract
NK cells eliminate viral-infected and malignant cells through a highly orchestrated series of cytoskeletal rearrangements, resulting in the release of cytolytic granule contents toward the target cell. Central to this process is the convergence of cytolytic granules to a common point, the microtubule-organizing center (MTOC), before delivery to the synapse. In this study, we show that vasodialator-stimulated phosphoprotein (VASP), an actin regulatory protein, localizes to the cytolytic synapse, but surprisingly, shows no impact on conjugate formation or synaptic actin accumulation despite being required for human NK cell-mediated killing. Interestingly, we also find that a pool of VASP copurifies with lytic granules and localizes with lytic granules at the MTOC. Significantly, depletion of VASP decreased lytic granule convergence without impacting MTOC polarization. Using the KHYG-1 cell line in which lytic granules are in a constitutively converged state, we find that either VASP depletion or F-actin destabilization promoted spreading of formerly converged granules. Our results demonstrate a novel requirement for VASP and actin polymerization in maintaining lytic granule convergence during NK cell-mediated killing.
Collapse
Affiliation(s)
- Katelynn M Wilton
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905.,Medical Scientist Training Program, College of Medicine, Mayo Clinic, Rochester, MN 55905; and
| | - Daniel D Billadeau
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905; .,Division of Oncology, College of Medicine, Mayo Clinic, Rochester, MN 55905
| |
Collapse
|
59
|
Huang P, Wang S, Weng D, Xu L. Alpha4-overexpressing HL7702 cells can counteract microcystin-LR effects on cytoskeletal structure. ENVIRONMENTAL TOXICOLOGY 2018; 33:978-987. [PMID: 29984889 DOI: 10.1002/tox.22585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 05/28/2018] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Abstract
Our previous studies indicated that α4 was involved in the toxicity of MC-LR on the cytoskeleton via the change of PP2A activity in HEK 293. To explore the role of α4 in MC-LR toxicity via PP2A regulation in different cell lines, the HL7702 cell overexpressing α4 protein was exposed to MC-LR, and the change of PP2A, cytoskeletal structure, and cytoskeleton-related proteins were investigated. The results showed that PP2A activity was decreased, PP2A/C subunit expression and phosphorylation (Tyr307) increased significantly, but methylation (Leu 309)clearly decreased. The structure of the actin filaments and microtubules (MTs) remained unchanged, and the expression and phosphorylation of the cytoskeleton-related proteins showed different changes. In addition, the main components of the MAPK pathway, JNK, P38, and ERK1/2, were activated together. Our results indicated that elevated α4 expression did confer some resistance to MC-LR-induced cytoskeletal changes, but the responses of different cell lines to MC-LR, under the α4-overexpression condition, are not exactly the same.
Collapse
Affiliation(s)
- Pu Huang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, China
| | - Sha Wang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, China
| | - Dengpo Weng
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, China
| | - Lihong Xu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, China
| |
Collapse
|
60
|
Wang J, Jia Y, Wang L, Li D, Wang L, Zhu Y, Liu J, Gong J. Vasodilator-Stimulated Phosphoprotein: Regulators of Adipokines Resistin and Phenotype Conversion of Epicardial Adipocytes. Med Sci Monit 2018; 24:6010-6020. [PMID: 30156215 PMCID: PMC6126413 DOI: 10.12659/msm.908111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Background Endothelial dysfunction plays a central part in the pathogenesis of coronary atherosclerosis. The adipokine resistin is one of the key players in endothelial cell dysfunction. In addition, the role of epicardial fat in coronary artery endothelial dysfunction is also emphasized. We investigated whether vasodilator-stimulated phosphoprotein (VASP) is involved in resistin-related endothelial dysfunction and the phenotype conversion of epicardial adipocytes. Material/Methods Cell proliferation and migration were evaluated by MTT and Transwell chamber assay, respectively. Next, we took epicardial fat samples from patients with valvular heart disease and non-coronary artery disease. Gene expression was determined by reverse transcription-quantitative polymerase chain reaction and relative abundance of the protein by Western blotting. Results Resistin induced endothelial proliferation and migration in a dose-dependent manner. Both resistin-induced cell proliferation and migration were effectively blocked by ablation of VASP. The brown adipose tissue-specific genes for uncoupling protein 1 (UCP-1) and PR-domain-missing16 (PRDM16) decreased, but the white adipose tissue-specific genes for resistin and RIP140 increased in VASP-deficient adipocytes compared with the LV-sicntr group. However, disruption of the Ras homolog gene family member A (RhoA) /Rho-associated kinase (ROCK) in VASP-deficient adipocytes with specific inhibitors inverted the adipocyte phenotype existing in VASP-deficient adipocytes. Furthermore, the expressions of proinflammatory cytokines interleukin-6 (IL-6), interleukin-8 (IL-8), and monocyte chemoattractantprotein-1 (MCP-1) in VASP-deficient adipocytes were markedly upregulated compared with the LV-sicntr group. Conclusions These results suggest a physiological role for VASP in coronary atherosclerosis through regulating adipokine resistin and phenotype conversion of epicardial adipose tissue.
Collapse
Affiliation(s)
- Jing Wang
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Yan Jia
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Lijun Wang
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Demin Li
- Department of Cardiothoracic Surgery, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Lei Wang
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Ying Zhu
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Jing Liu
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| | - Jianbin Gong
- Department of Cardiology, Jinling Hospital, School of Clinical Medicine, Nanjing University, Nanjing, Jiangsu, China (mainland)
| |
Collapse
|
61
|
Kollau A, Gesslbauer B, Russwurm M, Koesling D, Gorren ACF, Schrammel A, Mayer B. Modulation of nitric oxide-stimulated soluble guanylyl cyclase activity by cytoskeleton-associated proteins in vascular smooth muscle. Biochem Pharmacol 2018; 156:168-176. [PMID: 30099008 DOI: 10.1016/j.bcp.2018.08.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/08/2018] [Indexed: 12/18/2022]
Abstract
Soluble guanylyl cyclase (sGC, EC 4.6.1.2) is a key enzyme in the regulation of vascular tone. In view of the therapeutic interest of the NO/cGMP pathway, drugs were developed that either increase the NO sensitivity of the enzyme or activate heme-free apo-sGC. However, modulation of sGC activity by endogenous agents is poorly understood. In the present study we show that the maximal activity of NO-stimulated purified sGC is significantly increased by cytosolic preparations of porcine coronary arteries. Purification of the active principle by several chromatographic steps resulted in a protein mixture consisting of 100, 70, and 40 kDa bands on SDS polyacrylamide gel electrophoresis. The respective proteins were identified by LC-MS/MS as gelsolin, annexin A6, and actin, respectively. Further purification resulted in loss of activity, indicating an interaction of sGC with a protein complex rather than a single protein. The partially purified preparation had no effect on basal sGC activity or enzyme activation by the heme mimetic BAY 60-2770, suggesting a specific effect on the conformation of the NO-bound heterodimeric holoenzyme. Since the three proteins identified are all related to contractile elements of smooth muscle, our data suggest that regulation of vascular tone involves a modulatory interaction of sGC with the cytoskeleton.
Collapse
Affiliation(s)
- Alexander Kollau
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Graz, Austria.
| | - Bernd Gesslbauer
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, University of Graz, Graz, Austria
| | - Michael Russwurm
- Department of Pharmacology and Toxicology, Ruhr University Bochum, Bochum, Germany
| | - Doris Koesling
- Department of Pharmacology and Toxicology, Ruhr University Bochum, Bochum, Germany
| | - Antonius C F Gorren
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Graz, Austria
| | - Astrid Schrammel
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Graz, Austria
| | - Bernd Mayer
- Institute of Pharmaceutical Sciences, Department of Pharmacology and Toxicology, University of Graz, Graz, Austria
| |
Collapse
|
62
|
Ali M, Rogers LK, Heyob KM, Buhimschi CS, Buhimschi IA. Changes in Vasodilator-Stimulated Phosphoprotein Phosphorylation, Profilin-1, and Cofilin-1 in Accreta and Protection by DHA. Reprod Sci 2018; 26:757-765. [PMID: 30092744 DOI: 10.1177/1933719118792095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Accreta and gestational trophoblastic disease (ie, choriocarcinoma) are placental pathologies characterized by hyperproliferative and invasive trophoblasts. Cellular proliferation, migration, and invasion are heavily controlled by actin-binding protein (ABP)-mediated actin dynamics. The ABP vasodilator-stimulated phosphoprotein (VASP) carries key regulatory role. Profilin-1, cofilin-1, and VASP phosphorylated at Ser157 (pVASP-S157) and Ser239 (pVASP-S239) are ABPs that regulate actin polymerization and stabilization and facilitate cell metastases. Docosahexaenoic acid (DHA) inhibits cancer cell migration and proliferation. We hypothesized that analogous to malignant cells, ABPs regulate these processes in extravillous trophoblasts (EVTs), which exhibit aberrant expression in placenta accreta. Placental-myometrial junction biopsies of histologically confirmed placenta accreta had significantly increased immunostaining levels of cofilin-1, VASP, pVASP-S239, and F-actin. Treatment of choriocarcinoma-derived trophoblast (BeWo) cells with DHA (30 µM) for 24 hours significantly suppressed proliferation, migration, and pVASP-S239 levels and altered protein profiles consistent with increased apoptosis. We concluded that in accreta changes in the ABP expression profile were a response to restore homeostasis by counteracting the hyperproliferative and invasive phenotype of the EVT. The observed association between VASP phosphorylation, apoptosis, and trophoblast proliferation and migration suggest that DHA may offer a therapeutic solution for conditions where EVT is hyperinvasive.
Collapse
Affiliation(s)
- Mehboob Ali
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Crossroad, Columbus, OH, 43215, USA.
| | - Lynette K Rogers
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Crossroad, Columbus, OH, 43215, USA.,Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Kathryn M Heyob
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Crossroad, Columbus, OH, 43215, USA
| | - Catalin S Buhimschi
- Division of Maternal-Fetal Medicine, Department of Obstetrics & Gynecology, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Irina A Buhimschi
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, 575 Children's Crossroad, Columbus, OH, 43215, USA.,Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH, USA.,Division of Maternal-Fetal Medicine, Department of Obstetrics & Gynecology, The Ohio State University College of Medicine, Columbus, OH, USA
| |
Collapse
|
63
|
Tojkander S, Ciuba K, Lappalainen P. CaMKK2 Regulates Mechanosensitive Assembly of Contractile Actin Stress Fibers. Cell Rep 2018; 24:11-19. [DOI: 10.1016/j.celrep.2018.06.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 05/07/2018] [Accepted: 06/01/2018] [Indexed: 12/15/2022] Open
|
64
|
Bijvelds MJC, Tresadern G, Hellemans A, Smans K, Nieuwenhuijze NDA, Meijsen KF, Bongartz JP, Ver Donck L, de Jonge HR, Schuurkes JAJ, De Maeyer JH. Selective inhibition of intestinal guanosine 3',5'-cyclic monophosphate signaling by small-molecule protein kinase inhibitors. J Biol Chem 2018; 293:8173-8181. [PMID: 29653944 PMCID: PMC5971447 DOI: 10.1074/jbc.ra118.002835] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 04/11/2018] [Indexed: 11/06/2022] Open
Abstract
The guanosine 3',5'-cyclic monophosphate (cGMP)-dependent protein kinase II (cGKII) serine/threonine kinase relays signaling through guanylyl cyclase C (GCC) to control intestinal fluid homeostasis. Here, we report the discovery of small-molecule inhibitors of cGKII. These inhibitors were imidazole-aminopyrimidines, which blocked recombinant human cGKII at submicromolar concentrations but exhibited comparatively little activity toward the phylogenetically related protein kinases cGKI and cAMP-dependent protein kinase (PKA). Whereas aminopyrimidyl motifs are common in protein kinase inhibitors, molecular modeling of these imidazole-aminopyrimidines in the ATP-binding pocket of cGKII indicated an unconventional binding mode that directs their amine substituent into a narrow pocket delineated by hydrophobic residues of the hinge and the αC-helix. Crucially, this set of residues included the Leu-530 gatekeeper, which is not conserved in cGKI and PKA. In intestinal organoids, these compounds blocked cGKII-dependent phosphorylation of the vasodilator-stimulated phosphoprotein (VASP). In mouse small intestinal tissue, cGKII inhibition significantly attenuated the anion secretory response provoked by the GCC-activating bacterial heat-stable toxin (STa), a frequent cause of infectious secretory diarrhea. In contrast, both PKA-dependent VASP phosphorylation and intestinal anion secretion were unaffected by treatment with these compounds, whereas experiments with T84 cells indicated that they weakly inhibit the activity of cAMP-hydrolyzing phosphodiesterases. As these protein kinase inhibitors are the first to display selective inhibition of cGKII, they may expedite research on cGMP signaling and may aid future development of therapeutics for managing diarrheal disease and other pathogenic syndromes that involve cGKII.
Collapse
Affiliation(s)
- Marcel J C Bijvelds
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, P. O. Box 2040, 3000CA Rotterdam, The Netherlands.
| | - Gary Tresadern
- Janssen Research and Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Ann Hellemans
- Shire-Movetis NV, Veedijk 58, B-2300 Turnhout, Belgium
| | - Karine Smans
- Janssen Research and Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Natascha D A Nieuwenhuijze
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, P. O. Box 2040, 3000CA Rotterdam, The Netherlands
| | - Kelly F Meijsen
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, P. O. Box 2040, 3000CA Rotterdam, The Netherlands
| | - Jean-Pierre Bongartz
- Janssen Research and Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Luc Ver Donck
- Janssen Research and Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Hugo R de Jonge
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, P. O. Box 2040, 3000CA Rotterdam, The Netherlands
| | | | | |
Collapse
|
65
|
Tan HT, Chung MCM. Label-Free Quantitative Phosphoproteomics Reveals Regulation of Vasodilator-Stimulated Phosphoprotein upon Stathmin-1 Silencing in a Pair of Isogenic Colorectal Cancer Cell Lines. Proteomics 2018; 18:e1700242. [PMID: 29460479 DOI: 10.1002/pmic.201700242] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 02/10/2018] [Indexed: 02/06/2023]
Abstract
In this communication, we present the phosphoproteome changes in an isogenic pair of colorectal cancer cell lines, viz., the poorly metastatic HCT-116 and the highly metastatic derivative E1, upon stathmin-1 (STMN1) knockdown. The aim was to better understand how the alterations of the phosphoproteins in these cells are involved in cancer metastasis. After the phosphopeptides were enriched using the TiO2 HAMMOC approach, comparative proteomics analysis was carried out using sequential window acquisition of all theoretical mass spectra-MS. Following bioinformatics analysis using MarkerView and OneOmics platforms, we identified a list of regulated phosphoproteins that may play a potential role in signaling, maintenance of cytoskeletal structure, and focal adhesion. Among these phosphoproteins, was the actin cytoskeleton regulator protein, vasodilator-stimulated phosphoprotein (VASP), where its change in phosphorylation status was found to be concomitant with STMN1-associated roles in metastasis. We further showed that silencing of stathmin-1 altered the expression, subcellular localization and phosphorylation status of VASP, which suggested that it might be associated with remodeling of the cell cytoskeleton in colorectal cancer metastasis.
Collapse
Affiliation(s)
- Hwee Tong Tan
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Maxey Ching Ming Chung
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| |
Collapse
|
66
|
Laban H, Weigert A, Zink J, Elgheznawy A, Schürmann C, Günther L, Abdel Malik R, Bothur S, Wingert S, Bremer R, Rieger MA, Brüne B, Brandes RP, Fleming I, Benz PM. VASP regulates leukocyte infiltration, polarization, and vascular repair after ischemia. J Cell Biol 2018; 217:1503-1519. [PMID: 29507126 PMCID: PMC5881493 DOI: 10.1083/jcb.201702048] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 07/06/2017] [Accepted: 01/26/2018] [Indexed: 01/14/2023] Open
Abstract
In ischemic vascular diseases, leukocyte recruitment and polarization are crucial for revascularization and tissue repair. The study of Laban et al. provides evidence that VASP is a major regulator of leukocyte recruitment and polarization and vascular repair after ischemia. Mechanistically, the study supports a novel role of VASP in chemokine receptor trafficking. In ischemic vascular diseases, leukocyte recruitment and polarization are crucial for revascularization and tissue repair. We investigated the role of vasodilator-stimulated phosphoprotein (VASP) in vascular repair. After hindlimb ischemia induction, blood flow recovery, angiogenesis, arteriogenesis, and leukocyte infiltration into ischemic muscles in VASP−/− mice were accelerated. VASP deficiency also elevated the polarization of the macrophages through increased signal transducer and activator of transcription (STAT) signaling, which augmented the release of chemokines, cytokines, and growth factors to promote leukocyte recruitment and vascular repair. Importantly, VASP deletion in bone marrow–derived cells was sufficient to mimic the increased blood flow recovery of global VASP−/− mice. In chemotaxis experiments, VASP−/− neutrophils/monocytes were significantly more responsive to M1-related chemokines than wild-type controls. Mechanistically, VASP formed complexes with the chemokine receptor CCR2 and β-arrestin-2, and CCR2 receptor internalization was significantly reduced in VASP−/− leukocytes. Our data indicate that VASP is a major regulator of leukocyte recruitment and polarization in postischemic revascularization and support a novel role of VASP in chemokine receptor trafficking.
Collapse
Affiliation(s)
- Hebatullah Laban
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany.,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| | - Andreas Weigert
- Institute of Biochemistry I-Pathobiochemistry, Faculty of Medicine, Goethe University, Frankfurt am Main, Germany
| | - Joana Zink
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany.,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| | - Amro Elgheznawy
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany.,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| | - Christoph Schürmann
- German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany.,Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main, Germany
| | - Lea Günther
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany.,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| | - Randa Abdel Malik
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany.,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| | - Sabrina Bothur
- LOEWE Center for Cell and Gene Therapy and Department for Medicine, Hematology/Oncology, Goethe University, Frankfurt am Main, Germany
| | - Susanne Wingert
- LOEWE Center for Cell and Gene Therapy and Department for Medicine, Hematology/Oncology, Goethe University, Frankfurt am Main, Germany
| | - Rolf Bremer
- HBB Datenkommunikation and Abrechnungssysteme, Hannover, Germany
| | - Michael A Rieger
- LOEWE Center for Cell and Gene Therapy and Department for Medicine, Hematology/Oncology, Goethe University, Frankfurt am Main, Germany
| | - Bernhard Brüne
- Institute of Biochemistry I-Pathobiochemistry, Faculty of Medicine, Goethe University, Frankfurt am Main, Germany
| | - Ralf P Brandes
- German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany.,Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main, Germany
| | - Ingrid Fleming
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany.,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| | - Peter M Benz
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany .,German Centre of Cardiovascular Research (DZHK), Partner site Rhein-Main, Frankfurt am Main, Germany
| |
Collapse
|
67
|
Role of Corneal Stromal Cells on Epithelial Cell Function during Wound Healing. Int J Mol Sci 2018; 19:ijms19020464. [PMID: 29401709 PMCID: PMC5855686 DOI: 10.3390/ijms19020464] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 01/31/2018] [Accepted: 02/01/2018] [Indexed: 01/12/2023] Open
Abstract
Following injury, corneal stromal keratocytes transform into repair-phenotype of activated stromal fibroblasts (SFs) and participate in wound repair. Simultaneously, ongoing bi-directional communications between corneal stromal-epithelial cells also play a vital role in mediating the process of wound healing. Factors produced by stromal cells are known to induce proliferation, differentiation, and motility of corneal epithelial cells, which are also subsequently the main processes that occur during wound healing. In this context, the present study aims to investigate the effect of SFs conditioned medium (SFCM) on corneal epithelial cell function along with substance P (SP). Antibody microarrays were employed to profile differentially expressed cell surface markers and cytokines in the presence of SFCM and SP. Antibody microarray data revealed enhanced expression of the ITGB1 in corneal epithelial cells following stimulation with SP whereas SFCM induced abundant expression of IL-8, ITGB1, PD1L1, PECA1, IL-15, BDNF, ICAM1, CD8A, CD44 and NTF4. All these proteins have either direct or indirect roles in epithelial cell growth, movement and adhesion related signaling cascades during tissue regeneration. We also observed activation of MAPK signaling pathway along with increased expression of focal adhesion kinase (FAK), paxillin, vimentin, β-catenin and vasodilator-stimulated phosphoprotein (VASP) phosphorylation. Additionally, epithelial-to-mesenchymal transition (EMT) regulating transcription factors Slug and ZEB1 expression were enhanced in the presence of SFCM. SP enriched the expression of integrin subunits α4, α5, αV, β1 and β3 whereas SFCM increased α4, α5, αV, β1 and β5 integrin subunits. We also observed increased expression of Serpin E1 following SP and SFCM treatment. Wound healing scratch assay revealed enhanced migration of epithelial cells following the addition of SFCM. Taken together, we conclude that SFCM-mediated sustained activation of ZEB1, Slug in combination with upregulated migration-associated integrins and ERK (Extracellular signal-regulated kinase)-FAK-paxillin axis, may lead to induce type 2 EMT-like changes during corneal epithelial wound healing.
Collapse
|
68
|
Phosphorylation of vasodilator-stimulated phosphoprotein contributes to myocardial ischemic preconditioning. Basic Res Cardiol 2018; 113:11. [PMID: 29344719 DOI: 10.1007/s00395-018-0667-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 11/15/2017] [Accepted: 01/03/2018] [Indexed: 12/13/2022]
Abstract
Ischemic preconditioning (IP) is a well-known strategy to protect organs against cell death following ischemia. The previous work has shown that vasodilator-stimulated phosphoprotein (VASP) is involved in cytoskeletal reorganization and that it holds significant importance for the extent of myocardial ischemia reperfusion injury. Yet, the role of VASP during myocardial IP is, to date, not known. We report here that VASP phosphorylation at serine157 and serine239 is induced during hypoxia in vitro and during IP in vivo. The preconditioning-induced VASP phosphorylation inactivates the GP IIb/IIIa integrin receptor on platelets, which results in the reduced formation of organ compromising platelet neutrophil complexes. Experiments in chimeric mice confirmed the importance of VASP phosphorylation during myocardial IP. When studying this in VASP-/- animals and in an isolated heart model, we were able to confirm the important role of VASP on myocardial IP. In conclusion, we were able to show that IP-induced VASP phosphorylation in platelets is a protective mechanism against the deleterious effects of ischemia.
Collapse
|
69
|
New cGMP analogues restrain proliferation and migration of melanoma cells. Oncotarget 2017; 9:5301-5320. [PMID: 29435180 PMCID: PMC5797051 DOI: 10.18632/oncotarget.23685] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 12/18/2017] [Indexed: 12/14/2022] Open
Abstract
Melanoma is one of the most aggressive cancers and displays high resistance to conventional chemotherapy underlining the need for new therapeutic strategies. The cGMP/PKG signaling pathway was detected in melanoma cells and shown to reduce migration, proliferation and to increase apoptosis in different cancer types. In this study, we evaluated the effects on cell viability, cell death, proliferation and migration of novel dimeric cGMP analogues in two melanoma cell lines (MNT1 and SkMel28). These new dimeric cGMP analogues, by activating PKG with limited effects on PKA, significantly reduced proliferation, migration and increased cell death. No decrease in cell viability was observed in non-tumor cells suggesting a tumor-specific effect. These effects observed in melanoma are possibly mediated by PKG2 activation based on the decreased toxic effects in tumor cell lines not expressing PKG2. Finally, PKG-associated phosphorylation of vasodilator-stimulated-phosphoprotein (VASP), linked to cell death, proliferation and migration was found increased and with a change of subcellular localization. Increased phosphorylation of RhoA induced by activation of PKG may also contribute to reduced migration ability of the SkMel28 melanoma cell line when treated with cGMP analogues. These findings suggest that the cGMP/PKG pathway can be envisaged as a therapeutic target of novel dimeric cGMP analogues for the treatment of melanoma.
Collapse
|
70
|
Björkqvist J, Sala-Cunill A, Renné T. Hereditary angioedema: a bradykinin-mediated swelling disorder. Thromb Haemost 2017; 109:368-74. [DOI: 10.1160/th12-08-0549] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Accepted: 11/08/2012] [Indexed: 11/05/2022]
Abstract
SummaryEdema is tissue swelling and is a common symptom in a variety of diseases. Edema form due to accumulation of fluids, either through reduced drainage or increased vascular permeability. There are multiple vascular signalling pathways that regulate vessel permeability. An important mediator that increases vascular leak is the peptide hormone bradykinin, which is the principal agent in the swelling disorder hereditary angioedema. The disease is autosomal dominant inherited and presents clinically with recurrent episodes of acute swelling that can be life-threatening involving the skin, the oropharyngeal, laryngeal, and gastrointestinal mucosa. Three different types of hereditary angiodema exist in patients. The review summarises current knowledge on the pathophysiology of hereditary angiodema and focuses on recent experimental and pharmacological findings that have led to a better understanding and new treatments for the disease.
Collapse
|
71
|
Tanimura S, Takeda K. ERK signalling as a regulator of cell motility. J Biochem 2017; 162:145-154. [PMID: 28903547 DOI: 10.1093/jb/mvx048] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 05/17/2017] [Indexed: 01/21/2023] Open
Abstract
Cell motility is regulated by multiple processes, including cell protrusion, cell retraction, cell-matrix adhesion, polarized exocytosis and polarized vesicle trafficking, each of which is spatiotemporally controlled by various intracellular signalling pathways. Dysregulation of cell motility leads to pathological conditions, such as tumour invasion and metastasis. Accumulating evidence has revealed that extracellular signal-regulated kinase (ERK) signalling is one of the critical regulators of cell motility, although it is classically known as an important regulator of cell proliferation, differentiation and survival through regulation of gene expression. ERK and its downstream kinase, p90 ribosomal S6 kinase (RSK), dynamically regulate cell motility mainly through direct phosphorylation of various molecules that are not necessarily involved in the regulation of gene transcription and translation. In this review, we summarize how ERK signalling regulates cell motility by focusing on the components of the cell motility machinery that are directly regulated by ERK or RSK.
Collapse
Affiliation(s)
- Susumu Tanimura
- Department of Cell Regulation, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Kohsuke Takeda
- Department of Cell Regulation, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| |
Collapse
|
72
|
Signorello MG, Leoncini G. Activation of CaMKKβ/AMPKα pathway by 2-AG in human platelets. J Cell Biochem 2017; 119:876-884. [PMID: 28661046 DOI: 10.1002/jcb.26251] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 06/28/2017] [Indexed: 12/17/2022]
Abstract
The objective of this study was to determine whether AMPK is activated by 2-arachidonoylglycerol (2-AG) and participates to the cytoskeleton control in human platelets. We found that 2-AG stimulates the AMPKα activation through a Ca2+ /Calmodulin-dependent pathway as the specific inhibition of the CaMKKβ by STO-609 inhibits the AMPKα phosphorylation/activation. Moreover, the CaMKKβ/AMPKα pathway activated by 2-AG is involved in the phosphorylation of cofilin, vasodilator stimulated phosphoprotein (VASP), and myosin light chain (MLCs). These proteins participate to actin cytoskeletal remodelling during aggregation. We found that the phosphorylation/activation inhibition of these proteins is associated with a significant reduction in actin polymerization, aggregation, ATP, and α-granule secretion. Finally, AMPKα activation, Cofilin, VASP, and MLCs phosphorylation are significantly reduced by SR141716, the specific inhibitor of type 1 cannabinoid (CB1) receptor, suggesting that the CB1 receptor is involved in the 2-AG effect. In conclusion, we have shown that the CaMKKβ/AMPKα pathway is activated by 2-AG in human platelets and controls the phosphorylation of key proteins involved in actin polymerization and aggregation.
Collapse
Affiliation(s)
| | - Giuliana Leoncini
- Department of Pharmacy, Biochemistry Lab, University of Genoa, Genova, Italy
| |
Collapse
|
73
|
Soman KV, Stafford SJ, Pazdrak K, Wu Z, Luo X, White WI, Wiktorowicz JE, Calhoun WJ, Kurosky A. Activation of Human Peripheral Blood Eosinophils by Cytokines in a Comparative Time-Course Proteomic/Phosphoproteomic Study. J Proteome Res 2017; 16:2663-2679. [PMID: 28679203 DOI: 10.1021/acs.jproteome.6b00367] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Activated eosinophils contribute to airway dysfunction and tissue remodeling in asthma and thus are considered to be important factors in asthma pathology. We report here comparative proteomic and phosphoproteomic changes upon activation of eosinophils using eight cytokines individually and in selected cytokine combinations in time-course reactions. Differential protein and phosphoprotein expressions were determined by mass spectrometry after 2-dimensional gel electrophoresis (2DGE) and by LC-MS/MS. We found that each cytokine-stimulation produced significantly different changes in the eosinophil proteome and phosphoproteome, with phosphoproteomic changes being more pronounced and having an earlier onset. Furthermore, we observed that IL-5, GM-CSF, and IL-3 showed the greatest change in protein expression and phosphorylation, and this expression differed markedly from those of the other five cytokines evaluated. Comprehensive univariate and multivariate statistical analyses were employed to evaluate the comparative results. We also monitored eosinophil activation using flow cytometry (FC) analysis of CD69. In agreement with our proteomic studies, FC indicated that IL-5, GM-CSF, and IL-3 were more effective than the other five cytokines studied in stimulating a cell surface CD69 increase indicative of eosinophil activation. Moreover, selected combinations of cytokines revealed proteomic patterns with many proteins in common with single cytokine expression patterns but also showed a greater effect of the two cytokines employed, indicating a more complex signaling pathway that was reflective of a more typical inflammatory pathology.
Collapse
Affiliation(s)
- Kizhake V Soman
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Sealy Center for Molecular Medicine, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Susan J Stafford
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Konrad Pazdrak
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Sealy Center for Molecular Medicine, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Institute for Translational Sciences, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Zheng Wu
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Xuemei Luo
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Wendy I White
- MedImmune LLC , One MedImmune Way, Gaithersburg, Maryland 20878, United States
| | - John E Wiktorowicz
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Sealy Center for Molecular Medicine, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Institute for Translational Sciences, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Institute for Human Immunity & Infection, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - William J Calhoun
- Department of Internal Medicine, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Alexander Kurosky
- Department of Biochemistry & Molecular Biology, University of Texas Medical Branch , Galveston, Texas 77555, United States.,Sealy Center for Molecular Medicine, University of Texas Medical Branch , Galveston, Texas 77555, United States
| |
Collapse
|
74
|
Protein kinase A activation by the anti-cancer drugs ABT-737 and thymoquinone is caspase-3-dependent and correlates with platelet inhibition and apoptosis. Cell Death Dis 2017; 8:e2898. [PMID: 28661475 PMCID: PMC5520940 DOI: 10.1038/cddis.2017.290] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 05/25/2017] [Accepted: 05/26/2017] [Indexed: 12/14/2022]
Abstract
Chemotherapy-induced thrombocytopenia is a common bleeding risk in cancer patients and limits chemotherapy dose and frequency. Recent data from mouse and human platelets revealed that activation of protein kinase A/G (PKA/PKG) not only inhibited thrombin/convulxin-induced platelet activation but also prevented the platelet pro-coagulant state. Here we investigated whether or not PKA/PKG activation could attenuate caspase-dependent apoptosis induced by the anti-cancer drugs ABT-737 (the precursor of navitoclax) and thymoquinone (TQ), thereby potentially limiting chemotherapy-induced thrombocytopenia. This is particularly relevant as activation of cyclic nucleotide signalling in combination chemotherapy is an emerging strategy in cancer treatment. However, PKA/PKG-activation, as monitored by phosphorylation of Vasodilator-stimulated phosphoprotein (VASP), did not block caspase-3-dependent platelet apoptosis induced by the compounds. In contrast, both substances induced PKA activation themselves and PKA activation correlated with platelet inhibition and apoptosis. Surprisingly, ABT-737- and TQ-induced VASP-phosphorylation was independent of cAMP levels and neither cyclases nor phosphatases were affected by the drugs. In contrast, however, ABT-737- and TQ-induced PKA activation was blocked by caspase-3 inhibitors. In conclusion, we show that ABT-737 and TQ activate PKA in a caspase-3-dependent manner, which correlates with platelet inhibition and apoptosis and therefore potentially contributes to the bleeding risk in chemotherapy patients.
Collapse
|
75
|
Yu-Kemp HC, Kemp JP, Brieher WM. CRMP-1 enhances EVL-mediated actin elongation to build lamellipodia and the actin cortex. J Cell Biol 2017. [PMID: 28630144 PMCID: PMC5551698 DOI: 10.1083/jcb.201606084] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
CRMP proteins regulate the cytoskeleton, but the underlying mechanisms are poorly understood. Yu-Kemp et al. show that CRMP-1 helps Ena/VASP proteins elongate actin filaments to assemble actin networks that are necessary for the integrity of epithelial sheets. Cells can control actin polymerization by nucleating new filaments or elongating existing ones. We recently identified CRMP-1 as a factor that stimulates the formation of Listeria monocytogenes actin comet tails, thereby implicating it in actin assembly. We now show that CRMP-1 is a major contributor to actin assembly in epithelial cells, where it works with the Ena/VASP family member EVL to assemble the actin cytoskeleton in the apical cortex and in protruding lamellipodia. CRMP-1 and EVL bind to one another and together accelerate actin filament barbed-end elongation. CRMP-1 also stimulates actin assembly in the presence of VASP and Mena in vitro, but CRMP-1–dependent actin assembly in MDCK cells is EVL specific. Our results identify CRMP-1 as a novel regulator of actin filament elongation and reveal a surprisingly important role for CRMP-1, EVL, and actin polymerization in maintaining the structural integrity of epithelial sheets.
Collapse
Affiliation(s)
- Hui-Chia Yu-Kemp
- Department of Cell and Developmental Biology, University of Illinois, Urbana-Champaign, IL
| | - James P Kemp
- Department of Cell and Developmental Biology, University of Illinois, Urbana-Champaign, IL
| | - William M Brieher
- Department of Cell and Developmental Biology, University of Illinois, Urbana-Champaign, IL
| |
Collapse
|
76
|
YAP regulates cell mechanics by controlling focal adhesion assembly. Nat Commun 2017; 8:15321. [PMID: 28504269 PMCID: PMC5440673 DOI: 10.1038/ncomms15321] [Citation(s) in RCA: 347] [Impact Index Per Article: 49.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 03/10/2017] [Indexed: 12/16/2022] Open
Abstract
Hippo effectors YAP/TAZ act as on–off mechanosensing switches by sensing modifications in extracellular matrix (ECM) composition and mechanics. The regulation of their activity has been described by a hierarchical model in which elements of Hippo pathway are under the control of focal adhesions (FAs). Here we unveil the molecular mechanism by which cell spreading and RhoA GTPase activity control FA formation through YAP to stabilize the anchorage of the actin cytoskeleton to the cell membrane. This mechanism requires YAP co-transcriptional function and involves the activation of genes encoding for integrins and FA docking proteins. Tuning YAP transcriptional activity leads to the modification of cell mechanics, force development and adhesion strength, and determines cell shape, migration and differentiation. These results provide new insights into the mechanism of YAP mechanosensing activity and qualify this Hippo effector as the key determinant of cell mechanics in response to ECM cues. The transcriptional co-activator YAP is known to operate downstream of mechanical signals arising from the cell niche. Here the authors demonstrate that YAP controls cell mechanics, force development and adhesion strength by promoting the transcription of genes related to focal adhesions.
Collapse
|
77
|
Ena/VASP proteins regulate activated T-cell trafficking by promoting diapedesis during transendothelial migration. Proc Natl Acad Sci U S A 2017; 114:E2901-E2910. [PMID: 28320969 DOI: 10.1073/pnas.1701886114] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Vasodilator-stimulated phosphoprotein (VASP) and Ena-VASP-like (EVL) are cytoskeletal effector proteins implicated in regulating cell morphology, adhesion, and migration in various cell types. However, the role of these proteins in T-cell motility, adhesion, and in vivo trafficking remains poorly understood. This study identifies a specific role for EVL and VASP in T-cell diapedesis and trafficking. We demonstrate that EVL and VASP are selectively required for activated T-cell trafficking but are not required for normal T-cell development or for naïve T-cell trafficking to lymph nodes and spleen. Using a model of multiple sclerosis, we show an impairment in trafficking of EVL/VASP-deficient activated T cells to the inflamed central nervous system of mice with experimental autoimmune encephalomyelitis. Additionally, we found a defect in trafficking of EVL/VASP double-knockout (dKO) T cells to the inflamed skin and secondary lymphoid organs. Deletion of EVL and VASP resulted in the impairment in α4 integrin (CD49d) expression and function. Unexpectedly, EVL/VASP dKO T cells did not exhibit alterations in shear-resistant adhesion to, or in crawling on, primary endothelial cells under physiologic shear forces. Instead, deletion of EVL and VASP impaired T-cell diapedesis. Furthermore, T-cell diapedesis became equivalent between control and EVL/VASP dKO T cells upon α4 integrin blockade. Overall, EVL and VASP selectively mediate activated T-cell trafficking by promoting the diapedesis step of transendothelial migration in a α4 integrin-dependent manner.
Collapse
|
78
|
Huang P, Wang B, Wang X, Xing M, Guo Z, Xu L. HEK293 cells exposed to microcystin-LR show reduced protein phosphatase 2A activity and more stable cytoskeletal structure when overexpressing α4 protein. ENVIRONMENTAL TOXICOLOGY 2017; 32:255-264. [PMID: 26784437 DOI: 10.1002/tox.22230] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 12/04/2015] [Accepted: 12/06/2015] [Indexed: 06/05/2023]
Abstract
Microcystin-LR (MC-LR) is one of the most toxic members of microcystins released by freshwater cyanobacterial. The major mechanism of MC-LR toxicity has been attributed to its inhibition of protein phosphatases 1 (PP1) and 2A (PP2A). In our prior research, α4 protein, a regulator of PP2A, was found not only crucial for PP2A regulation but also for the overall response of HEK 293 cells encountering MC-LR. To explore the role of α4 in MC-LR toxicity via PP2A regulation, here, HEK 293 cells overexpressing α4 protein were exposed to MC-LR and PP2A, cytoskeletal organization, and cytoskeleton-related proteins were investigated. The results showed that PP2A activity decreased and PP2A/C subunit expression and phosphorylation at Tyr307 increased significantly in the group exposed to high MC-LR. Vimentin IF became concentrated and formed perinuclear bundles. However, the assembly of actin filament and microtubules remained unchanged and the expression and phosphorylation of the cytoskeleton-related proteins HSP27 and VASP did not increase significantly. Some of these results differ from those of our previous study in which normal HEK293 cells were exposed to MC-LR. Our results indicate that elevated α4 expression confers some resistance to MC-LR-induced cytoskeletal change These new findings provide helpful insights into the mechanism of MC-LR toxicity and the role of α4 in regulating PP2A function. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 255-264, 2017.
Collapse
Affiliation(s)
- Pu Huang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, 310058, China
| | - Beilei Wang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, 310058, China
| | - Xiaofeng Wang
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Mingluan Xing
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Zonglou Guo
- Department of Biosystem Engineering, College of Biosystem Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China
| | - Lihong Xu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, 310058, China
| |
Collapse
|
79
|
Jayakumar T, Lin KC, Lu WJ, Lin CY, Pitchairaj G, Li JY, Sheu JR. Nobiletin, a citrus flavonoid, activates vasodilator-stimulated phosphoprotein in human platelets through non-cyclic nucleotide-related mechanisms. Int J Mol Med 2016; 39:174-182. [PMID: 27959381 PMCID: PMC5179174 DOI: 10.3892/ijmm.2016.2822] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 11/28/2016] [Indexed: 11/19/2022] Open
Abstract
Nobiletin, a bioactive polymethoxylated flavone, has been described to possess a diversity of biological effects through its antioxidant and anti-inflammatory properties. Vasodilator-stimulated phosphoprotein (VASP) is a common substrate for cyclic AMP and cyclic GMP-regulated protein kinases [i.e., cyclic AMP-dependent protein kinase (PKA; also known as protein kinase A) and cyclic GMP-dependent protein kinase (PKG; also known as protein kinase G)] and it has been shown to be directly phosphorylated by protein kinase C (PKC). In the present study, we demonstrate that VASP is phosphorylated by nobiletin in human platelets via a non-cyclic nucleotide-related mechanism. This was confirmed by the use of inhibitors of adenylate cyclase (SQ22536) and guanylate cyclase [1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ)], since they prevented VASP phosphorylation induced by nobiletin. Furthormore, this event was also not affected by specific inhibitors of PKA (H-89), PKG (KT5823) and PKC (Ro318220), representing cyclic nucleotide-dependent pathways upon nobiletin-induced VASP phosphorylation. Similarly, inhibitors of p38 mitogen-activated protein kinase (MAPK; SB203580), extracellular signal-regulated kinase 2 (ERK2; PD98059), c-Jun N-terminal kinase 1 (JNK1; SP600125), Akt (LY294002) and nuclear factor-κB (NF-κB; Bay11-7082) did not affect nobiletin-induced VASP phosphorylation. Moreover, electron spin resonance, dichlorofluorescein fluorescence and western blotting techniques revealed that nobiletin did not affect hydroxyl radicals (OH•), intracellular reactive oxygen species (ROS) and on protein carbonylation, respectively. Furthermore, the nobiletin-induced VASP phosphorylation was surprisingly reversed by the intracellular antioxidant, N-acetylcysteine (NAC), but not by the inhibitor of NADPH oxidase, diphenyleneiodonium chloride (DPI). It was surprising to observe the differential effects of nobiletin and NAC on VASP phosphorylation in human platelets, since they both have been reported to have antioxidant properties. The likely explanation for this discrepancy is that NAC may bind to allosteric sites on the receptor different from those that nobiletin binds to in human platelets. Taken together, our findings suggest that nobiletin induces VASP phosphorylation in human platelets through non-cyclic nucleotide-related mechanisms. Nevertheless, the exact mechanisms responsible for these effects need to be further confirmed in future studies.
Collapse
Affiliation(s)
- Thanasekaran Jayakumar
- Department of Pharmacology, College of Medicine, Taipei Medical University, Taipei, Taiwan, R.O.C
| | - Kao-Chang Lin
- Department of Pharmacology, College of Medicine, Taipei Medical University, Taipei, Taiwan, R.O.C
| | - Wan-Jung Lu
- Department of Pharmacology, College of Medicine, Taipei Medical University, Taipei, Taiwan, R.O.C
| | - Chia-Ying Lin
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan, R.O.C
| | - Geraldine Pitchairaj
- Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Jiun-Yi Li
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan, R.O.C
| | - Joen-Rong Sheu
- Department of Pharmacology, College of Medicine, Taipei Medical University, Taipei, Taiwan, R.O.C
| |
Collapse
|
80
|
Colonne PM, Winchell CG, Graham JG, Onyilagha FI, MacDonald LJ, Doeppler HR, Storz P, Kurten RC, Beare PA, Heinzen RA, Voth DE. Vasodilator-Stimulated Phosphoprotein Activity Is Required for Coxiella burnetii Growth in Human Macrophages. PLoS Pathog 2016; 12:e1005915. [PMID: 27711191 PMCID: PMC5053435 DOI: 10.1371/journal.ppat.1005915] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 09/05/2016] [Indexed: 11/18/2022] Open
Abstract
Coxiella burnetii is an intracellular bacterial pathogen that causes human Q fever, an acute flu-like illness that can progress to chronic endocarditis and liver and bone infections. Humans are typically infected by aerosol-mediated transmission, and C. burnetii initially targets alveolar macrophages wherein the pathogen replicates in a phagolysosome-like niche known as the parasitophorous vacuole (PV). C. burnetii manipulates host cAMP-dependent protein kinase (PKA) signaling to promote PV formation, cell survival, and bacterial replication. In this study, we identified the actin regulatory protein vasodilator-stimulated phosphoprotein (VASP) as a PKA substrate that is increasingly phosphorylated at S157 and S239 during C. burnetii infection. Avirulent and virulent C. burnetii triggered increased levels of phosphorylated VASP in macrophage-like THP-1 cells and primary human alveolar macrophages, and this event required the Cα subunit of PKA. VASP phosphorylation also required bacterial protein synthesis and secretion of effector proteins via a type IV secretion system, indicating the pathogen actively triggers prolonged VASP phosphorylation. Optimal PV formation and intracellular bacterial replication required VASP activity, as siRNA-mediated depletion of VASP reduced PV size and bacterial growth. Interestingly, ectopic expression of a phospho-mimetic VASP (S239E) mutant protein prevented optimal PV formation, whereas VASP (S157E) mutant expression had no effect. VASP (S239E) expression also prevented trafficking of bead-containing phagosomes to the PV, indicating proper VASP activity is critical for heterotypic fusion events that control PV expansion in macrophages. Finally, expression of dominant negative VASP (S157A) in C. burnetii-infected cells impaired PV formation, confirming importance of the protein for proper infection. This study provides the first evidence of VASP manipulation by an intravacuolar bacterial pathogen via activation of PKA in human macrophages. Q fever, caused by the intracellular bacterial pathogen Coxiella burnetii, is an aerosol-transmitted infection that can develop into life-threatening chronic infections such as endocarditis. The pathogen preferentially grows within alveolar macrophages in a phagolysosome-like compartment termed the parasitophorous vacuole (PV). C. burnetii actively manipulates host cAMP-dependent protein kinase (PKA) signaling to promote PV formation and cell survival. Identification of bacterial effector proteins that manipulate PKA and downstream target proteins is critical to fully understand pathogen-mediated signaling circuits and develop new therapeutic strategies. Here, we found that PKA controls vasodilator-stimulated phosphoprotein (VASP) activity to promote PV formation and bacterial replication. VASP regulates actin-based motility used by a subset of intracellular bacteria for propulsion through the host cell cytosol and into bystander cells. However, C. burnetii does not use actin-based motility and replicates throughout its life cycle within a membrane bound vacuole. Thus, this study provides the first evidence of VASP manipulation by an intravacuolar bacterial pathogen. Characterization of VASP function in PV formation and identification of additional PKA substrates that promote infection will provide new insight into host-pathogen interactions during Q fever.
Collapse
Affiliation(s)
- Punsiri M. Colonne
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Caylin G. Winchell
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Joseph G. Graham
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Frances I. Onyilagha
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Laura J. MacDonald
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Heike R. Doeppler
- Department of Cancer Biology, Mayo Clinic, Jacksonville, Florida, United States of America
| | - Peter Storz
- Department of Cancer Biology, Mayo Clinic, Jacksonville, Florida, United States of America
| | - Richard C. Kurten
- Department of Physiology and Biophysics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
- Arkansas Children’s Hospital Research Institute, Little Rock, Arkansas, United States of America
| | - Paul A. Beare
- Coxiella Pathogenesis Section, Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, United States of America
| | - Robert A. Heinzen
- Coxiella Pathogenesis Section, Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, United States of America
| | - Daniel E. Voth
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
- * E-mail:
| |
Collapse
|
81
|
Benz PM, Laban H, Zink J, Günther L, Walter U, Gambaryan S, Dib K. Vasodilator-Stimulated Phosphoprotein (VASP)-dependent and -independent pathways regulate thrombin-induced activation of Rap1b in platelets. Cell Commun Signal 2016; 14:21. [PMID: 27620165 PMCID: PMC5020514 DOI: 10.1186/s12964-016-0144-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 09/06/2016] [Indexed: 11/13/2022] Open
Abstract
Background Vasodilator-Stimulated Phosphoprotein (VASP) is involved in the inhibition of agonist-induced platelet aggregation by cyclic nucleotides and the adhesion of platelets to the vascular wall. αIIbβ3 is the main integrin responsible for platelet activation and Rap1b plays a key role in integrin signalling. We investigated whether VASP is involved in the regulation of Rap1b in platelets since VASP-null platelets exhibit augmented adhesion to endothelial cells in vivo. Methods Washed platelets from wild type and VASP-deficient mice were stimulated with thrombin, the purinergic receptors agonist ADP, or the thromboxane A2 receptor agonist U46619 and Rap1b activation was measured using the GST-RalGDS-RBD binding assay. Interaction of VASP and Crkl was investigated by co-immunoprecipitation, confocal microscopy, and pull-down assays using Crkl domains expressed as GST-fusion proteins. Results Surprisingly, we found that activation of Rap1b in response to thrombin, ADP, or U46619 was significantly reduced in platelets from VASP-null mice compared to platelets from wild type mice. However, inhibition of thrombin-induced activation of Rap1b by nitric oxide (NO) was similar in platelets from wild type and VASP-null mice indicating that the NO/cGMP/PKG pathway controls inhibition of Rap1b independently from VASP. To understand how VASP regulated Rap1b, we investigated association between VASP and the Crk-like protein (Crkl), an adapter protein which activates the Rap1b guanine nucleotide exchange factor C3G. We demonstrated the formation of a Crkl/VASP complex by showing that: 1) Crkl co-immunoprecipitated VASP from platelet lysates; 2) Crkl and VASP dynamically co-localized at actin-rich protrusions reminiscent of focal adhesions, filopodia, and lamellipodia upon platelet spreading on fibronectin; 3) recombinant VASP bound directly to the N-terminal SH3 domain of Crkl; 4) Protein Kinase A (PKA) -mediated VASP phosphorylation on Ser157 abrogated the binding of Crkl. Conclusions We identified Crkl as a novel protein interacting with VASP in platelets. We propose that the C3G/Crkl/VASP complex plays a role in the regulation of Rap1b and this explains, at least in part, the reduced agonist-induced activation of Rap1b in VASP-null platelets. In addition, the fact that PKA-dependent VASP phosphorylation abrogated its interaction with Crkl may provide, at least in part, a rationale for the PKA-dependent inhibition of Rap1b and platelet aggregation.
Collapse
Affiliation(s)
- Peter M Benz
- Institute for Vascular Signalling, Centre for Molecular Medicine, Johann Wolfgang Goethe University and DZHK (German Centre for Cardiovascular Research) partner site Rhine-Main, 60590, Frankfurt, Germany
| | - Hebatullah Laban
- Institute for Vascular Signalling, Centre for Molecular Medicine, Johann Wolfgang Goethe University and DZHK (German Centre for Cardiovascular Research) partner site Rhine-Main, 60590, Frankfurt, Germany
| | - Joana Zink
- Institute for Vascular Signalling, Centre for Molecular Medicine, Johann Wolfgang Goethe University and DZHK (German Centre for Cardiovascular Research) partner site Rhine-Main, 60590, Frankfurt, Germany
| | - Lea Günther
- Institute for Vascular Signalling, Centre for Molecular Medicine, Johann Wolfgang Goethe University and DZHK (German Centre for Cardiovascular Research) partner site Rhine-Main, 60590, Frankfurt, Germany
| | - Ulrich Walter
- Centre for Thrombosis and Hemostasis (CTH), University Medical Center Mainz, Mainz, Germany
| | - Stepan Gambaryan
- Department of Cytology and Histology, St. Petersburg State University, St. Petersburg, Russia.,Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia
| | - Karim Dib
- Centre for Experimental Medicine, Medical Biology Center (MBC) building, Queen's University of Belfast, Third floor, 97 Lisburn Road, BT9 7BL, Belfast, Northern Ireland, UK.
| |
Collapse
|
82
|
Ali M, Heyob K, Jacob NK, Rogers LK. Alterative Expression and Localization of Profilin 1/VASPpS157 and Cofilin 1/VASPpS239 Regulates Metastatic Growth and Is Modified by DHA Supplementation. Mol Cancer Ther 2016; 15:2220-31. [PMID: 27496138 DOI: 10.1158/1535-7163.mct-16-0092] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 06/23/2016] [Indexed: 01/26/2023]
Abstract
Profilin 1, cofilin 1, and vasodialator-stimulated phosphoprotein (VASP) are actin-binding proteins (ABP) that regulate actin remodeling and facilitate cancer cell metastases. miR-17-92 is highly expressed in metastatic tumors and profilin1 and cofilin1 are predicted targets. Docosahexaenoic acid (DHA) inhibits cancer cell proliferation and adhesion. These studies tested the hypothesis that the metastatic phenotype is driven by changes in ABPs including alternative phosphorylation and/or changes in subcellular localization. In addition, we tested the efficacy of DHA supplementation to attenuate or inhibit these changes. Human lung cancer tissue sections were analyzed for F-actin content and expression and cellular localization of profilin1, cofilin1, and VASP (S157 or S239 phosphorylation). The metastatic phenotype was investigated in A549 and MLE12 cells lines using 8 Br-cAMP as a metastasis inducer and DHA as a therapeutic agent. Migration was assessed by wound assay and expression measured by Western blot and confocal analysis. miR-17-92 expression was measured by qRT-PCR. Results indicated increased expression and altered cellular distribution of profilin1/VASP(pS157), but no changes in cofilin1/VASP(pS239) in the human malignant tissues compared with normal tissues. In A549 and MLE12 cells, the expression patterns of profilin1/VASP(pS157) or cofilin1/VASP(pS239) suggested an interaction in regulation of actin dynamics. Furthermore, DHA inhibited cancer cell migration and viability, ABP expression and cellular localization, and modulated expression of miR-17-92 in A549 cells with minimal effects in MLE12 cells. Further investigations are warranted to understand ABP interactions, changes in cellular localization, regulation by miR-17-92, and DHA as a novel therapeutic. Mol Cancer Ther; 15(9); 2220-31. ©2016 AACR.
Collapse
Affiliation(s)
- Mehboob Ali
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio.
| | - Kathryn Heyob
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio
| | | | - Lynette K Rogers
- Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio. Department of Pediatrics, The Ohio State University, Columbus, Ohio
| |
Collapse
|
83
|
Döppler H, Bastea L, Borges S, Geiger X, Storz P. The phosphorylation status of VASP at serine 322 can be predictive for aggressiveness of invasive ductal carcinoma. Oncotarget 2016; 6:29740-52. [PMID: 26336132 PMCID: PMC4745759 DOI: 10.18632/oncotarget.4965] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 07/31/2015] [Indexed: 11/25/2022] Open
Abstract
Vasodilator-stimulated phosphoprotein (VASP) signaling is critical for dynamic actin reorganization processes that define the motile phenotype of cells. Here we show that VASP is generally highly expressed in normal breast tissue and breast cancer. We also show that the phosphorylation status of VASP at S322 can be predictive for breast cancer progression to an aggressive phenotype. Our data indicate that phosphorylation at S322 is gradually decreased from normal breast to DCIS, luminal/ER+, HER2+ and basal-like/TN phenotypes. Similarly, the expression levels of PKD2, the kinase that phosphorylates VASP at this site, are decreased in invasive ductal carcinoma samples of all three groups. Overall, the phosphorylation status of this residue may serve as an indicator of aggressiveness of breast tumors.
Collapse
Affiliation(s)
- Heike Döppler
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Ligia Bastea
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Sahra Borges
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | | | - Peter Storz
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| |
Collapse
|
84
|
Shen K, Johnson DW, Gobe GC. The role of cGMP and its signaling pathways in kidney disease. Am J Physiol Renal Physiol 2016; 311:F671-F681. [PMID: 27413196 DOI: 10.1152/ajprenal.00042.2016] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 07/10/2016] [Indexed: 01/20/2023] Open
Abstract
Cyclic nucleotide signal transduction pathways are an emerging research field in kidney disease. Activated cell surface receptors transduce their signals via intracellular second messengers such as cAMP and cGMP. There is increasing evidence that regulation of the cGMP-cGMP-dependent protein kinase 1-phosphodiesterase (cGMP-cGK1-PDE) signaling pathway may be renoprotective. Selective PDE5 inhibitors have shown potential in treating kidney fibrosis in patients with chronic kidney disease (CKD), via their downstream signaling, and these inhibitors also have known activity as antithrombotic and anticancer agents. This review gives an outline of the cGMP-cGK1-PDE signaling pathways and details the downstream signaling and regulatory functions that are modulated by cGK1 and PDE inhibitors with regard to antifibrotic, antithrombotic, and antitumor activity. Current evidence that supports the renoprotective effects of regulating cGMP-cGK1-PDE signaling is also summarized. Finally, the effects of icariin, a natural plant extract with PDE5 inhibitory function, are discussed. We conclude that regulation of cGMP-cGK1-PDE signaling might provide novel, therapeutic strategies for the worsening global public health problem of CKD.
Collapse
Affiliation(s)
- Kunyu Shen
- Centre for Kidney Disease Research, School of Medicine, Translational Research Institute, The University of Queensland, Brisbane, Australia; Second School of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China; and
| | - David W Johnson
- Centre for Kidney Disease Research, School of Medicine, Translational Research Institute, The University of Queensland, Brisbane, Australia; Department of Nephrology, Princess Alexandra Hospital, Brisbane, Australia
| | - Glenda C Gobe
- Centre for Kidney Disease Research, School of Medicine, Translational Research Institute, The University of Queensland, Brisbane, Australia;
| |
Collapse
|
85
|
Lee WH, Choong LY, Mon NN, Lu S, Lin Q, Pang B, Yan B, Krishna VSR, Singh H, Tan TZ, Thiery JP, Lim CT, Tan PBO, Johansson M, Harteneck C, Lim YP. TRPV4 Regulates Breast Cancer Cell Extravasation, Stiffness and Actin Cortex. Sci Rep 2016; 6:27903. [PMID: 27291497 PMCID: PMC4904279 DOI: 10.1038/srep27903] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 05/26/2016] [Indexed: 12/28/2022] Open
Abstract
Metastasis is a significant health issue. The standard mode of care is combination of chemotherapy and targeted therapeutics but the 5-year survival rate remains low. New/better drug targets that can improve outcomes of patients with metastatic disease are needed. Metastasis is a complex process, with each step conferred by a set of genetic aberrations. Mapping the molecular changes associated with metastasis improves our understanding of the etiology of this disease and contributes to the pipeline of targeted therapeutics. Here, phosphoproteomics of a xenograft-derived in vitro model comprising 4 isogenic cell lines with increasing metastatic potential implicated Transient Receptor Potential Vanilloid subtype 4 in breast cancer metastasis. TRPV4 mRNA levels in breast, gastric and ovarian cancers correlated with poor clinical outcomes, suggesting a wide role of TRPV4 in human epithelial cancers. TRPV4 was shown to be required for breast cancer cell invasion and transendothelial migration but not growth/proliferation. Knockdown of Trpv4 significantly reduced the number of metastatic nodules in mouse xenografts leaving the size unaffected. Overexpression of TRPV4 promoted breast cancer cell softness, blebbing, and actin reorganization. The findings provide new insights into the role of TRPV4 in cancer extravasation putatively by reducing cell rigidity through controlling the cytoskeleton at the cell cortex.
Collapse
Affiliation(s)
- Wen Hsin Lee
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Lee Yee Choong
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Naing Naing Mon
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - SsuYi Lu
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Qingsong Lin
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore
| | - Brendan Pang
- Cancer Science Institute of Singapore, Singapore
| | - Benedict Yan
- National University Hospital, Department of Laboratory Medicine, Singapore
| | | | - Himanshu Singh
- Department of Biomedical Engineering, National University of Singapore, Singapore
| | - Tuan Zea Tan
- Cancer Science Institute of Singapore, Singapore
| | - Jean Paul Thiery
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- Cancer Science Institute of Singapore, Singapore
| | - Chwee Teck Lim
- Mechanobiology Institute, National University of Singapore, Singapore
- Department of Biomedical Engineering, National University of Singapore, Singapore
| | | | | | - Christian Harteneck
- Department of Pharmacology and Experimental Therapy, Institute of Experimental and Clinical Pharmacology and Toxicology, Eberhard Karls University Hospitals and Clinics, Tübingen, Germany
| | - Yoon Pin Lim
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
- National University Cancer Institute, National University Health System, Singapore
| |
Collapse
|
86
|
Tojkander S, Gateva G, Husain A, Krishnan R, Lappalainen P. Generation of contractile actomyosin bundles depends on mechanosensitive actin filament assembly and disassembly. eLife 2015; 4:e06126. [PMID: 26652273 PMCID: PMC4714978 DOI: 10.7554/elife.06126] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 10/15/2015] [Indexed: 12/20/2022] Open
Abstract
Adhesion and morphogenesis of many non-muscle cells are guided by contractile actomyosin bundles called ventral stress fibers. While it is well established that stress fibers are mechanosensitive structures, physical mechanisms by which they assemble, align, and mature have remained elusive. Here we show that arcs, which serve as precursors for ventral stress fibers, undergo lateral fusion during their centripetal flow to form thick actomyosin bundles that apply tension to focal adhesions at their ends. Importantly, this myosin II-derived force inhibits vectorial actin polymerization at focal adhesions through AMPK-mediated phosphorylation of VASP, and thereby halts stress fiber elongation and ensures their proper contractility. Stress fiber maturation additionally requires ADF/cofilin-mediated disassembly of non-contractile stress fibers, whereas contractile fibers are protected from severing. Taken together, these data reveal that myosin-derived tension precisely controls both actin filament assembly and disassembly to ensure generation and proper alignment of contractile stress fibers in migrating cells. DOI:http://dx.doi.org/10.7554/eLife.06126.001 Muscle cells are the best-known example of a cell in the human body that can contract. These cells contain bundles of filaments made of proteins called actin and myosin, which can generate pulling forces. However, many other cells in the human body also rely on similar “contractile actomyosin bundles” to help them stick to each other, to maintain the correct shape or to migrate from one location to another. These bundles in the non-muscle cells are often called “ventral stress fibers”. Ventral stress fibers develop from structures commonly referred to as “arcs”. Previous work has clearly established that ventral stress fibers are sensitive to mechanical forces. However, the underlying mechanism behind this process was not known, and it remained unclear how external forces could promote these actomyosin bundles to assemble, align and mature. Tojkander et al. documented the formation of ventral stress fibers in migrating human cells grown in the laboratory. This revealed that pre-existing arcs fuse with each other to form thicker and more contractile actomyosin bundles. The formation of these bundles then pulls on the two ends of the stress fibers that are attached to sites on the edges of the cell. Tojkander et al. also showed that this tension inactivates a protein called VASP, which is also found at these sites. Inactivating VASP inhibits the construction of actin filaments, which in turn stops the stress fibers from elongating and allows them to contract. Further experiments then revealed that ventral stress fibers are maintained and can even become thicker under a sustained pulling force. Conversely, stress fibers that were not under tension were decorated by proteins that promote the disassembly of actin filaments. This subsequently led to the disappearance of these fibers. Future studies could now examine whether the newly identified pathway, which allows mechanical forces to control the assembly and alignment of stress fibers, is conserved in other cell-types. Furthermore, and because the assembly of such mechanosensitive actomyosin bundles is often defective in cancer cells, it will also be important to study this pathway’s significance in the context of cancer progression. DOI:http://dx.doi.org/10.7554/eLife.06126.002
Collapse
Affiliation(s)
- Sari Tojkander
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Gergana Gateva
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Amjad Husain
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, United States
| | - Ramaswamy Krishnan
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, United States
| | - Pekka Lappalainen
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| |
Collapse
|
87
|
Kenne E, Nickel KF, Long AT, Fuchs TA, Stavrou EX, Stahl FR, Renné T. Factor XII: a novel target for safe prevention of thrombosis and inflammation. J Intern Med 2015; 278:571-85. [PMID: 26373901 DOI: 10.1111/joim.12430] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Plasma protein factor XII (FXII) activates the procoagulant and proinflammatory contact system that drives both the kallikrein-kinin system and the intrinsic pathway of coagulation. When zymogen FXII comes into contact with negatively charged surfaces, it auto-activates to the serine proteaseactivated FXII (FXIIa). Recently, various in vivo activators of FXII have been identified including heparin, misfolded protein aggregates, polyphosphate and nucleic acids. Murine models have established a central role of FXII in arterial and venous thrombosis. Despite its central function in thrombosis, deficiency in FXII does not impair haemostasis in animals and humans. In a preclinical cardiopulmonary bypass system in large animals, the FXIIa-blocking antibody 3F7 prevented thrombosis; however, in contrast to traditional anticoagulants, bleeding was not increased. In addition to its function in thrombosis, FXIIa initiates formation of the inflammatory mediator bradykinin. This mediator increases vascular leak, causes vasodilation, and induces chemotaxis with implications for septic, anaphylactic and allergic disease states. Therefore, targeting FXIIa appears to be a promising strategy for thromboprotection without associated bleeding risks but with anti-inflammatory properties.
Collapse
Affiliation(s)
- E Kenne
- Division of Clinical Chemistry, Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Center of Molecular Medicine, Karolinska Institutet and University Hospital, Stockholm, Sweden
| | - K F Nickel
- Division of Clinical Chemistry, Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Center of Molecular Medicine, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - A T Long
- Department of Medicine, Hematology and Oncology Division, Case Western Reserve University and Louis Stokes Cleveland VA Medical Center, Cleveland, OH, USA
| | - T A Fuchs
- Division of Clinical Chemistry, Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Center of Molecular Medicine, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - E X Stavrou
- Department of Medicine, Hematology and Oncology Division, Case Western Reserve University and Louis Stokes Cleveland VA Medical Center, Cleveland, OH, USA
| | - F R Stahl
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - T Renné
- Division of Clinical Chemistry, Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Center of Molecular Medicine, Karolinska Institutet and University Hospital, Stockholm, Sweden.,Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| |
Collapse
|
88
|
Li H, Liu J, Wang W, Zhang Z, Li D, Lin K, Chen Z, Lin W. Matrix Metalloproteinase 9 and Vasodilator-Stimulated Phosphoprotein Related to Acute Kidney Injury in Severe Acute Pancreatitis Rats. Dig Dis Sci 2015; 60:3647-55. [PMID: 26264698 DOI: 10.1007/s10620-015-3820-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Accepted: 07/18/2015] [Indexed: 12/26/2022]
Abstract
BACKGROUND Severe acute pancreatitis (SAP) usually results in acute renal failure. Matrix metalloproteinase 9 (MMP-9) and vasodilator-stimulated phosphoprotein (VASP) may participate in disease progression. AIM To investigate the renal expression of MMP-9 and VASP in SAP rats with acute kidney injury. METHODS A total of 100 rats were randomly assigned to sham 6-h, sham 12-h, sham 24-h, sham 36-h, sham 48-h, SAP 6-h, SAP 12-h, SAP 24-h, SAP 36-h, and SAP 48-h treatment groups (n = 10 per group). Levels of serum amylase (AMY), creatinine (Cr), and blood urea nitrogen (BUN) were determined. Renal pathology and ultrastructural examinations were performed, and renal mRNA and protein expression of MMP-9 and VASP were determined by real-time RT-PCR and Western blot, respectively. The activity of MMP-9 was assessed by gelatin zymography. RESULTS In the SAP groups, serum levels of AMY, Cr, and BUN were markedly higher than in the sham groups. The peak value of AMY was observed from 12 to 24 h, but that of Cr and BUN was observed at 36 h. Capillary endothelial cells in the renal interstitium were impaired and expression of MMP-9 and VASP in the kidney was significantly increased when compared with the sham groups. Expression of MMP-9 and VASP declined when renal damage reached a maximum after 24 h. CONCLUSIONS In the presence of acute kidney injury in SAP, the renal expression of MMP-9 and VASP is related to damage of endothelial cells in capillaries, which reached a maximum at 24 h and declined afterwards.
Collapse
Affiliation(s)
- Haitao Li
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| | - Jianqiang Liu
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China.
| | - Wen Wang
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| | - Zhijian Zhang
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| | - Dazhou Li
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| | - Kerong Lin
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| | - Zhiping Chen
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| | - Wulian Lin
- Department of Gastroenterology, Fuzhou General Hospital of Nanjing Command, Fuzong Clinical Medical College of Fujian Medical University, 165 Xi'erhuan North Road, Fuzhou, 350025, Fujian Province, China
| |
Collapse
|
89
|
Lee SY, Gertler FB, Goldberg MB. Vasodilator-stimulated phosphoprotein restricts cell-to-cell spread of Shigella flexneri at the cell periphery. MICROBIOLOGY-SGM 2015; 161:2149-60. [PMID: 26358985 DOI: 10.1099/mic.0.000173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Shigella spp. are intracellular bacterial pathogens that cause diarrhoeal disease in humans. Shigella utilize the host actin cytoskeleton to enter cells, move through the cytoplasm of cells and pass into adjacent cells. Ena/VASP family proteins are highly conserved proteins that participate in actin-dependent dynamic cellular processes. We tested whether Ena/VASP family members VASP (vasodilator-stimulated phosphoprotein), Mena (mammalian-enabled) or EVL (Ena-VASP-like) contribute to Shigella flexneri spread through cell monolayers. VASP and EVL restricted cell-to-cell spread without significantly altering actin-based motility, whereas Mena had no effect on these processes. Phosphorylation of VASP on Ser153, Ser235 and Thr274 regulated its subcellular distribution and function. VASP derivatives that lack the Ena/VASP homology 1 (EVH1) domain or contain a phosphoablative mutation of Ser153 were defective in restricting S. flexneri spread, indicating that the EVH1 domain and phosphorylation on Ser153 are required for this process. The EVH1 domain and Ser153 of VASP were required for VASP localization to focal adhesions, and localization of VASP to focal adhesions and/or the leading edge was required for restriction of spread. The contribution of the EVH1 domain was from both the donor and the recipient cell, whereas the contribution of Ser153 phosphorylation was only from the donor cell. Thus, unlike host proteins characterized in Shigella pathogenesis that promote bacterial spread, VASP and EVL function to limit it. The ability of VASP and EVL to limit spread highlights the critical role of focal adhesion complexes and/or the leading edge in bacterial passage between cells.
Collapse
Affiliation(s)
- Soo Young Lee
- 1Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Frank B Gertler
- 2Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Marcia B Goldberg
- 1Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA 3Division of Infectious Diseases, Massachusetts General Hospital, Cambridge, MA 02139, USA
| |
Collapse
|
90
|
Abstract
Ena/VASP tetramer composition was analysed and mixed oligomerization of Mena with EVL was found to be unfavourable, while other paralogue combinations formed without apparent bias. The tetramerization domain of Ena/VASP proteins is responsible for their selective tetramer formation. The members of the actin regulatory family of Ena/VASP proteins form stable tetramers. The vertebrate members of the Ena/VASP family, VASP, Mena and EVL, have many overlapping properties and expression patterns, but functional and regulatory differences between paralogues have been observed. The formation of mixed oligomers may serve a regulatory role to refine Ena/VASP activity. While it has been assumed that family members can form mixed oligomers, this possibility has not been investigated systematically. Using cells expressing controlled combinations of VASP, Mena and EVL, we evaluated the composition of Ena/VASP oligomers and found that VASP forms oligomers without apparent bias with itself, Mena or EVL. However, Mena and EVL showed only weak hetero-oligomerization, suggesting specificity in the association of Ena/VASP family members. Co-expression of VASP increased the ability of Mena and EVL to form mixed oligomers. Additionally, we found that the tetramerization domain (TD) at the C-termini of Ena/VASP proteins conferred the observed selectivity. Finally, we demonstrate that replacement of the TD with a synthetic tetramerizing coiled coil sequence supports homo-oligomerization and normal VASP subcellular localization.
Collapse
|
91
|
Gkretsi V, Bogdanos DP. Experimental evidence of Migfilin as a new therapeutic target of hepatocellular carcinoma metastasis. Exp Cell Res 2015; 334:219-27. [PMID: 25773778 DOI: 10.1016/j.yexcr.2015.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/01/2015] [Accepted: 03/04/2015] [Indexed: 02/07/2023]
Abstract
Migfilin is a novel cell-matrix adhesion protein known to interact with Vasodilator Stimulated Phosphoprotein (VASP) and be localized both at cell-matrix and cell-cell adhesions. To date there is nothing known about its role in hepatocellular carcinoma (HCC). As matrix is important in metastasis, we aimed to investigate the Migfilin׳s role in HCC metastasis using two human HCC cell lines that differ in their metastatic potential; non-invasive Alexander cells and the highly invasive HepG2 cells. We silenced Migfilin by siRNA and studied its effect on signaling and metastasis-related cellular properties. We show that Migfilin׳s expression is elevated in HepG2 cells and its silencing leads to upregulation of actin reorganization-related proteins, namely phosphor-VASP (Ser157 and Ser239), Fascin-1 and Rho-kinase-1, promoting actin polymerization and inhibiting cell invasion. Phosphor-Akt (Ser473) is decreased contributing to the upregulation of free and phosphor-β-catenin (Ser33/37Thr41) and inducing proliferation. Migfilin elimination upregulates Extracellular Signal-regulated kinase, which increases cell adhesion in HepG2 and reduces invasiveness. This is the first study to reveal that Migfilin inhibition can halt HCC metastasis in vitro, providing the molecular mechanism involved and presenting Migfilin as potential therapeutic target against HCC metastasis.
Collapse
Affiliation(s)
- Vasiliki Gkretsi
- Department of Biomedical Research and Technology, Institute for Research and Technology-Thessaly, Centre for Research and Technology-Hellas (CE.R.T.H.), Larissa 41222, Greece.
| | - Dimitrios P Bogdanos
- Department of Biomedical Research and Technology, Institute for Research and Technology-Thessaly, Centre for Research and Technology-Hellas (CE.R.T.H.), Larissa 41222, Greece; Department of Rheumatology, School of Medicine, University of Thessaly, University Hospital of Larissa, 41110 Larissa, Greece; Institute of Liver Studies, King׳s College Hospital, Denmark Hill, London SE5 9RS, UK
| |
Collapse
|
92
|
Wu Y, Gunst SJ. Vasodilator-stimulated phosphoprotein (VASP) regulates actin polymerization and contraction in airway smooth muscle by a vinculin-dependent mechanism. J Biol Chem 2015; 290:11403-16. [PMID: 25759389 DOI: 10.1074/jbc.m115.645788] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Indexed: 11/06/2022] Open
Abstract
Vasodilator-stimulated phosphoprotein (VASP) can catalyze actin polymerization by elongating actin filaments. The elongation mechanism involves VASP oligomerization and its binding to profilin, a G-actin chaperone. Actin polymerization is required for tension generation during the contraction of airway smooth muscle (ASM); however, the role of VASP in regulating actin dynamics in ASM is not known. We stimulated ASM cells and tissues with the contractile agonist acetylcholine (ACh) or the adenylyl cyclase activator, forskolin (FSK), a dilatory agent. ACh and FSK stimulated VASP Ser(157) phosphorylation by different kinases. Inhibition of VASP Ser(157) phosphorylation by expression of the mutant VASP S157A in ASM tissues suppressed VASP phosphorylation and membrane localization in response to ACh, and also inhibited contraction and actin polymerization. ACh but not FSK triggered the formation of VASP-VASP complexes as well as VASP-vinculin and VASP-profilin complexes at membrane sites. VASP-VASP complex formation and the interaction of VASP with vinculin and profilin were inhibited by expression of the inactive vinculin mutant, vinculin Y1065F, but VASP phosphorylation and membrane localization were unaffected. We conclude that VASP phosphorylation at Ser(157) mediates its localization at the membrane, but that VASP Ser(157) phosphorylation and membrane localization are not sufficient to activate its actin catalytic activity. The interaction of VASP with activated vinculin at membrane adhesion sites is a necessary prerequisite for VASP-mediated molecular processes necessary for actin polymerization. Our results show that VASP is a critical regulator of actin dynamics and tension generation during the contractile activation of ASM.
Collapse
Affiliation(s)
- Yidi Wu
- From the Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana 46202-5120
| | - Susan J Gunst
- From the Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana 46202-5120
| |
Collapse
|
93
|
Bernusso VA, Machado-Neto JA, Pericole FV, Vieira KP, Duarte AS, Traina F, Hansen MD, Olalla Saad ST, Barcellos KS. Imatinib restores VASP activity and its interaction with Zyxin in BCR–ABL leukemic cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:388-95. [DOI: 10.1016/j.bbamcr.2014.11.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 10/30/2014] [Accepted: 11/04/2014] [Indexed: 12/24/2022]
|
94
|
Gharehbaghian A, Salimian M, Taherian AA, Elahi A, Khamechian T, Karimi G, Ghasemzadeh M. Variations in Intraplatelet Phospho-VASP Expression Due to Pre-analytical Sample Preparations, Illustration of a Quality Control Issue in Platelet Pharmacology. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2015; 14:321-8. [PMID: 25561938 PMCID: PMC4277645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Intraplatelet vasodilator-stimulated phosphoprotein (VASP) analysis is a commonly used laboratory approach for monitoring of the anti-platelet therapy with adenosine diphosphate (ADP) receptor blocking agents; however, it's testing in clinical laboratory needs a high level of experience and proficiency. The ability to recognize how the pre-analytical variations can change the results would be helpful for the interpretation of data from intraplatelet VASP analysis. The aim of this study was to describe the possible differences of intraplatelet phospho-VASP expression between washed and platelet rich plasma (PRP) samples, both at baseline levels and following experimentally induction of VASP phosphorylation. PRP and washed platelet samples were treated with different inducers of VASP phosphorylation, including forskolin (10 µM), prostaglandin E1 (PGE1) (50 nM) and sodium nitro-prusside (SNP) (100 µM). Untreated PRP and washed platelet samples were also included in study as baseline controls. After labeling of platelets with either anti P-Serine(157)-VASP or anti P-Serine(239)-VASP, the samples were subjected to flow cytometric analysis to monitor the levels of intraplatelet phospho-VASP expression. Washed platelet samples tend to show increased expression of intraplatelet P-Serine(157)-VASP at baseline state and also more expression of P-Serine(157)-VASP and P-Serine(239)-VASP in response to forskolin and SNP, compared with PRP samples. Though, reduced levels of PGE1-induced VASP phosphorylation at both residues were detected for washed platelets. In this study we have provided some background information required for performing of intraplatelet VASP analysis on differently handled platelet samples and interpretation of the obtained results.
Collapse
Affiliation(s)
- Ahmad Gharehbaghian
- Hematology and Blood Banking Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran. ,Pediatric Congenital Hematologic Disorders Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Morteza Salimian
- Blood Transfusion Research Centre, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran. ,Platelet Research Laboratory, Kashan University of Medical Sciences, Kashan, Iran.
| | - Ali Akbar Taherian
- Anatomical Sciences Research Center, Kashan University of Medical Sciences, Kashan, Iran
| | - Asghar Elahi
- Platelet Research Laboratory, Kashan University of Medical Sciences, Kashan, Iran.
| | - Tahereh Khamechian
- Platelet Research Laboratory, Kashan University of Medical Sciences, Kashan, Iran.
| | - Gharib Karimi
- Blood Transfusion Research Centre, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran.
| | - Mehran Ghasemzadeh
- Blood Transfusion Research Centre, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran. ,E-mail:
| |
Collapse
|
95
|
Sun Y, Liu JH, Huang P, Guo ZL, Xu LH. Alterations of tau and VASP during microcystin-LR-induced cytoskeletal reorganization in a human liver cell line. ENVIRONMENTAL TOXICOLOGY 2015; 30:92-100. [PMID: 23929704 DOI: 10.1002/tox.21898] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 07/04/2013] [Accepted: 07/11/2013] [Indexed: 06/02/2023]
Abstract
Previously, we have reported alterations to HSP27 during Microcystin-LR (MC-LR)-induced cytoskeletal reorganization in the human liver cell line HL7702. To further elucidate the detailed mechanism of MC-LR-induced cytoskeletal assembly, we focused on two cytoskeletal-related proteins, Tau and VASP. These two proteins phosphorylated status influences their ability to bind and stabilize cytoskeleton. We found that MC-LR markedly increased the level of Tau phosphorylation with the dissociation of phosphorylated Tau from the cytoskeleton. Furthermore, the phosphorylation of Tau induced by MC-LR was suppressed by an activator of PP2A and by an inhibitor of p38 MAPK. VASP was also hyperphosphorylated upon MC-LR exposure; however, its phosphorylation appeared to regulate its cellular localization rather than cytoskeletal dynamics, and its phosphorylation was unaffected by the PP2A activator. These data suggest that phosphorylated Tau is regulated by p38 MAPK, possibly as a consequence of PP2A inhibition. Tau hyperphosphorylation is likely an important factor leading to the cytoskeletal destabilization triggered by MC-LR and the role of VASP alteration upon MC-LR exposure needs to be studied further. To our knowledge, the finding that Tau is implicated in cytoskeletal destabilization in MC-LR-treated hepatocytes and MC-LR-induced VASP's alteration has not been reported previously.
Collapse
Affiliation(s)
- Yu Sun
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | | | | | | | | |
Collapse
|
96
|
Serine phosphorylation of vasodilator-stimulated phosphoprotein (VASP) regulates colon cancer cell survival and apoptosis. Life Sci 2014; 123:1-8. [PMID: 25543053 DOI: 10.1016/j.lfs.2014.12.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Revised: 09/29/2014] [Accepted: 12/15/2014] [Indexed: 12/16/2022]
Abstract
AIMS In colon cancer, disease recurrence and death are associated with abnormal tumor cell survival. Vasodilator-stimulated phosphoprotein (VASP) is an actin binding protein regulating cell shape and polarity through the F-actin cytoskeleton, whose activity is controlled by cAMP-dependent phosphorylation at Ser157 and cGMP-dependent phosphorylation at Ser239. This study examined the role of differential VASP Ser phosphorylation in regulating cell survival and apoptosis in human colon carcinoma cells. MAIN METHODS Selective inhibition of VASP Ser157 or Ser239 phosphorylation in colon cancer cells was performed with specific phosphomutant constructs. F-actin organization was examined by confocal microscopy, and the balance of cell survival and death assessed by measuring acridine orange and ethidium bromide staining, caspase-3 and BAD-pS112 expression and DNA fragmentation. KEY FINDINGS In human colon carcinoma cells suppression of VASP Ser157 phosphorylation reduced F-actin content and survival and increased apoptosis, while inhibition of VASP Ser239 phosphorylation increased F-actin content and survival and reduced cell death. Also, while 8Br-cAMP induced VASP Ser157 phosphorylation and reduced cell death, treatments with 8CPT-cGMP elevated VASP Ser239 phosphorylation and promoted apoptosis. SIGNIFICANCE These findings suggest that differential VASP Ser phosphorylation represents a unique therapeutic target to control cell survival and death behavior in colon cancer. In particular, pharmacological manipulation of VASP Ser phosphorylation could be exploited to affect the malignant actin cytoskeleton and induce apoptosis in colorectal cancer cells.
Collapse
|
97
|
Ke Y, Tan Y, Wei N, Yang F, Yang H, Cao S, Wang X, Wang J, Han Y, Bi Y, Cui Y, Yan Y, Song Y, Yang X, Du Z, Yang R. Yersinia protein kinase A phosphorylates vasodilator-stimulated phosphoprotein to modify the host cytoskeleton. Cell Microbiol 2014; 17:473-85. [PMID: 25298072 DOI: 10.1111/cmi.12378] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 09/13/2014] [Accepted: 10/04/2014] [Indexed: 01/03/2023]
Abstract
Pathogenic Yersinia species evolved a type III secretion system that injects a set of effectors into the host cell cytosol to promote infection. One of these effectors, Yersinia protein kinase A (YpkA), is a multidomain effector that harbours a Ser/Thr kinase domain and a guanine dissociation inhibitor (GDI) domain. The intercellular targets of the kinase and GDI domains of YpkA were identified to be Gαq and the small GTPases RhoA and Rac1, respectively, which synergistically induce cytotoxic effects on infected cells. In this study, we demonstrate that vasodilator-stimulated phosphoprotein (VASP), which is critical for regulation of actin assembly, cell adhesion and motility, is a direct substrate of YpkA kinase activity. Ectopic co-expression of YpkA and VASP in HEK293T cells leads to the phosphorylation of VASP at S157, and YpkA kinase activity is essential for VASP phosphorylation at this site. Moreover, YpkA directly phosphorylates VASP in in vitro kinase assay. YpkA-mediated VASP phosphorylation significantly inhibits actin polymerization and promotes the disruption of actin cytoskeleton, which inhibits the phagocytosis. Taken together, our study found a novel molecular mechanism used by YpkA to disrupt cytoskeleton dynamics, thereby promoting the anti-phagocytosis ability of pathogenic Yersiniae.
Collapse
Affiliation(s)
- Yuehua Ke
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, 100071, China; Beijing Institute of Disease Control and Prevention, Beijing, 100071, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
98
|
Wang H, Liu J, Lin S, Wang B, Xing M, Guo Z, Xu L. MCLR-induced PP2A inhibition and subsequent Rac1 inactivation and hyperphosphorylation of cytoskeleton-associated proteins are involved in cytoskeleton rearrangement in SMMC-7721 human liver cancer cell line. CHEMOSPHERE 2014; 112:141-153. [PMID: 25048900 DOI: 10.1016/j.chemosphere.2014.03.130] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 03/26/2014] [Accepted: 03/27/2014] [Indexed: 06/03/2023]
Abstract
Cyanobacteria-derived toxin microcystin-LR (MCLR) has been widely investigated in its effects on normal cells, there is little information concerning its effects on cancer cells. In the present study, the SMMC-7721 human liver cancer cell line treated with MCLR was used to investigate the change of PP2A, cytoskeleton rearrangement, phosphorylation levels of PP2A substrates that related with cytoskeleton stability and explored underlying mechanisms. Here, we confirmed that MCLR entered into SMMC-7721 cells, bound to PP2A/C subunit and inhibited the activity of PP2A. The upregulation of phosphorylation of the PP2A/C subunit and PP2A regulation protein α4, as well as the change in the association of PP2A/C with α4, were responsible for the decrease in PP2A activity. Another novel finding is that the rearrangement of filamentous actin and microtubules led by MCLR may attribute to the increased phosphorylation of HSP27, VASP and cofilin due to PP2A inhibition. As a result of weakened interactions with PP2A and alterations in its subcellular localization, Rac1 may contribute to the cytoskeletal rearrangement induced by MCLR in SMMC-7721 cells. The current paper presents the first report demonstrating the characteristic of PP2A in MCLR exposed cancer cells, which were more susceptible to MCLR compared with the normal cell lines we previously found, which may be owing to the absence of some type of compensatory mechanisms. The hyperphosphorylation of cytoskeleton-associated proteins and Rac1 inactivation which were induced by inhibition of PP2A are shown to be involved in cytoskeleton rearrangement.
Collapse
Affiliation(s)
- Hao Wang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Jinghui Liu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Shuyan Lin
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Beilei Wang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Mingluan Xing
- Zhejiang Center for Disease Control and Prevention, Hangzhou 310051, China
| | - Zonglou Guo
- Department of Biosystem Engineering, College of Biosystem Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
| | - Lihong Xu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China.
| |
Collapse
|
99
|
Nishikimi A, Ishihara S, Ozawa M, Etoh K, Fukuda M, Kinashi T, Katagiri K. Rab13 acts downstream of the kinase Mst1 to deliver the integrin LFA-1 to the cell surface for lymphocyte trafficking. Sci Signal 2014; 7:ra72. [PMID: 25074980 DOI: 10.1126/scisignal.2005199] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
In lymphocytes, the kinase Mst1 is required for the proper organization of integrins in the plasma membrane at the leading edge of migrating cells, which is critical for lymphocyte trafficking. We found a functional link between the small G protein Rab13 and Mst1 in lymphocyte adhesion and migration. In response to stimulation of T lymphocytes with chemokine, Mst1 promoted phosphorylation of the guanine nucleotide exchange factor DENND1C (differentially expressed in normal and neoplastic cells domain 1C), which activated Rab13. Active Rab13 associated with Mst1 to facilitate the delivery of the integrin LFA-1 (lymphocyte function-associated antigen 1) to the leading edge of lymphocytes. Delivery of LFA-1 involved the recruitment of myosin Va along actin filaments, which extended as a result of the localization of the actin regulatory protein VASP to the cell periphery through phosphorylation of VASP at Ser(157) by Mst1. Inhibition of Rab13 function reduced the adhesion and migration of lymphocytes on ICAM-1 (intercellular adhesion molecule-1), the ligand for LFA-1, and inhibited the formation of a ring-like arrangement of LFA-1 at the contact sites between T cells and antigen-presenting cells. The lymphoid tissues of Rab13-deficient mice had reduced numbers of lymphocytes because of the defective trafficking capability of these cells. These results suggest that Rab13 acts with Mst1 to regulate the spatial distribution of LFA-1 and the motility and trafficking of lymphocytes.
Collapse
Affiliation(s)
- Akihiko Nishikimi
- Department of Biosciences, School of Science, Kitasato University, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Sayaka Ishihara
- Department of Biosciences, School of Science, Kitasato University, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Madoka Ozawa
- Department of Molecular Genetics, Institute of Biomedical Science, Kansai Medical University, 2-5-1 Shinmachi, Hirakata, Osaka 573-1010, Japan
| | - Kan Etoh
- Laboratory of Membrane Trafficking Mechanisms, Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Mitsunori Fukuda
- Laboratory of Membrane Trafficking Mechanisms, Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Tatsuo Kinashi
- Department of Molecular Genetics, Institute of Biomedical Science, Kansai Medical University, 2-5-1 Shinmachi, Hirakata, Osaka 573-1010, Japan. CREST, Japan Science and Technology Agency, 7 Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan
| | - Koko Katagiri
- Department of Biosciences, School of Science, Kitasato University, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan. CREST, Japan Science and Technology Agency, 7 Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan.
| |
Collapse
|
100
|
KIM GUENTAE, LEE SEHEE, KIM YOUNGMIN. Torilis japonica extract, a new potential EMT suppressor agent by regulation of EGFR signaling pathways. Int J Oncol 2014; 45:1673-9. [DOI: 10.3892/ijo.2014.2546] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 07/02/2014] [Indexed: 11/05/2022] Open
|