1
|
Ebrahimi Z, Farsinejad A, Mohammadi MH, Ahmadizad S. Comparable effects of circuit and traditional resistance exercise on platelet α2bβ3 receptor and platelet activation and function. Clin Hemorheol Microcirc 2022; 83:293-303. [PMID: 36565105 DOI: 10.3233/ch-221603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Resistance exercise induces thrombocytosis and increases platelet activation and function. These changes might be related to exercise variables including exercise intensity and type. OBJECTIVE We compared the effects of traditional resistance exercise (TRE) and circuit resistance exercise (CRE) on cellular markers of platelet activation and function. METHODS In this crossover study ten healthy male (mean±SD: age, 25.6±2.4 years) subjects performed TRE encompassed 3 sets of 10 repetitions at 100% of 10-RM (10 repetition maximum) for 6 exercises, and CRE protocols included 3 sets of 10 repetitions at 100% of 10-RM for all 6 exercises consecutively, in two separate weeks. To measure platelet indices, PAC1, CD41a, CD42b and CD62P three blood samples were taken before, immediately after exercise, and after 30 min recovery. RESULTS Lactate concentration, blood pressure, platelet count (PLT), and mean platelet volume (MPV) were significantly (p < 0.05) increased following both resistance exercise trials. Significant increases in PAC1, and CD62P; and significant reductions for CD42b and CD41a were detected following both REs (p < 0.05). However, changes in PAC1 and CD62P were significantly different between the two protocols (p < 0.05), with higher increases detected following CRE. CONCLUSIONS Acute RE increases platelet indices and platelet activation; and that CRE results in higher platelet activation than TRE, probably due to exercise-induced increases in shear stress.
Collapse
Affiliation(s)
- Zahra Ebrahimi
- Department of Biological Sciences in Sport, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran
| | - Alireza Farsinejad
- Cell Therapy and Regenerative Medicine Comprehensive Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Hossein Mohammadi
- HSCT Research Center, Laboratory Hematology and Blood Banking Department, School of Allied Medical Sciences, Shahid Beheshti University of Medical Science, Tehran, Iran
| | - Sajad Ahmadizad
- Department of Biological Sciences in Sport, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran
| |
Collapse
|
2
|
Binder V, Chruścicka-Smaga B, Bergum B, Jaisson S, Gillery P, Sivertsen J, Hervig T, Kaminska M, Tilvawala R, Nemmara VV, Thompson PR, Potempa J, Marti HP, Mydel P. Carbamylation of Integrin α IIb β 3: The Mechanistic Link to Platelet Dysfunction in ESKD. J Am Soc Nephrol 2022; 33:1841-1856. [PMID: 36038265 PMCID: PMC9528322 DOI: 10.1681/asn.2022010013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 06/05/2022] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Bleeding diatheses, common among patients with ESKD, can lead to serious complications, particularly during invasive procedures. Chronic urea overload significantly increases cyanate concentrations in patients with ESKD, leading to carbamylation, an irreversible modification of proteins and peptides. METHODS To investigate carbamylation as a potential mechanistic link between uremia and platelet dysfunction in ESKD, we used liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) to quantify total homocitrulline, and biotin-conjugated phenylglyoxal labeling and Western blot to detect carbamylated integrin α IIb β 3 (a receptor required for platelet aggregation). Flow cytometry was used to study activation of isolated platelets and platelet-rich plasma. In a transient transfection system, we tested activity and fibrinogen binding of different mutated forms of the receptor. We assessed platelet adhesion and aggregation in microplate assays. RESULTS Carbamylation inhibited platelet activation, adhesion, and aggregation. Patients on hemodialysis exhibited significantly reduced activation of α IIb β 3 compared with healthy controls. We found significant carbamylation of both subunits of α IIb β 3 on platelets from patients receiving hemodialysis versus only minor modification in controls. In the transient transfection system, modification of lysine 185 in the β 3 subunit was associated with loss of receptor activity and fibrinogen binding. Supplementation of free amino acids, which was shown to protect plasma proteins from carbamylation-induced damage in patients on hemodialysis, prevented loss of α IIb β 3 activity in vitro. CONCLUSIONS Carbamylation of α IIb β 3-specifically modification of the K185 residue-might represent a mechanistic link between uremia and dysfunctional primary hemostasis in patients on hemodialysis. The observation that free amino acids prevented the carbamylation-induced loss of α IIb β 3 activity suggests amino acid administration during dialysis may help to normalize platelet function.
Collapse
Affiliation(s)
- Veronika Binder
- Broegelmann Research Laboratory, University of Bergen, Bergen, Norway
| | | | - Brith Bergum
- Broegelmann Research Laboratory, University of Bergen, Bergen, Norway
| | - Stéphane Jaisson
- Laboratory of Biochemistry and Molecular Biology, Unité Mixte de Recherche (UMR) Centre National de la Recherche Scientifique (CNRS) 7369, University of Reims Champagne-Ardenne, Reims, France
| | - Philippe Gillery
- Laboratory of Biochemistry and Molecular Biology, Unité Mixte de Recherche (UMR) Centre National de la Recherche Scientifique (CNRS) 7369, University of Reims Champagne-Ardenne, Reims, France
| | - Joar Sivertsen
- Department of Immunology and Transfusion Medicine, Haukeland University Hospital, Bergen, Norway
| | - Tor Hervig
- Broegelmann Research Laboratory, University of Bergen, Bergen, Norway
- Department of Immunology and Transfusion Medicine, Haukeland University Hospital, Bergen, Norway
| | - Marta Kaminska
- Broegelmann Research Laboratory, University of Bergen, Bergen, Norway
| | - Ronak Tilvawala
- Department of Biochemistry and Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts
| | - Venkatesh V. Nemmara
- Department of Biochemistry and Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts
| | - Paul R. Thompson
- Department of Biochemistry and Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts
| | - Jan Potempa
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
- Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry, Louisville, Kentucky
| | - Hans-Peter Marti
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
- Department of Medicine, Haukeland University Hospital, Bergen, Norway
| | - Piotr Mydel
- Broegelmann Research Laboratory, University of Bergen, Bergen, Norway
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| |
Collapse
|
3
|
Lee JH, Jung H, Song J, Choi ES, You G, Mok H. Activated Platelet-Derived Vesicles for Efficient Hemostatic Activity. Macromol Biosci 2020; 20:e1900338. [PMID: 32053289 DOI: 10.1002/mabi.201900338] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 01/03/2020] [Indexed: 12/17/2022]
Abstract
In this study, activated platelet-derived vesicles (Act-VEs) are developed as a novel hemostatic biomaterial. Spherical Act-VEs (114.40 ± 11.69 nm in size) with surface charges of -24.73 ± 1.32 mV are successfully prepared from thrombin-activated murine platelets with high surface expression of active glycoprotein IIb/IIIa (GP IIb/IIIa, also known as αIIbβ3) and P-selectin. Although nanosized vesicles from resting platelets (VEs) and Act-VEs showed similar sizes and surface charges, Act-VEs formed much larger aggregates in the presence of thrombin and CaCl2 , compared to VEs. After incubation with fibrinogen, Act-VEs formed much denser fibrin networks compared to platelets or VEs, probably due to active αIIbβ3 on the surfaces of the Act-VEs. After intravenous injection of the Act-VEs, tail bleeding time and the blood loss are greatly reduced by Act-VEs in vivo. In addition, Act-VEs showed approximately sevenfold lower release of pro-inflammatory interleukin-1β (IL-1β) during incubation for 4 days, compared to platelets. Taken together, the formulated Act-VEs can serve as a promising hemostatic biomaterial for the efficient formation of fibrin clots without releasing pro-inflammatory cytokine.
Collapse
Affiliation(s)
- Joo Hang Lee
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea
| | - Heesun Jung
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea
| | - Jihyeon Song
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea
| | - Eun Seo Choi
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea
| | - Gayeon You
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea
| | - Hyejung Mok
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea
| |
Collapse
|
4
|
Wan W, Ye Y, Wang H, Li L, Gu Y, Yang L, Yang L, Liu H, Meng C, Li D, Wang Z, Meng Z. Platelet Carcinoembryonic Antigen Cell Adhesion Molecule 5 (CEACAM5) as a Possible Novel Diagnostic Tool for Evaluation of Acute Coronary Syndrome. Med Sci Monit 2019; 25:9864-9874. [PMID: 31865362 PMCID: PMC6938652 DOI: 10.12659/msm.918913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background Acute coronary syndrome (ACS) occurs approximately every 40 seconds, and was an underlying cause of death in 1 out of every 7 deaths. More accurate indicators are needed to distinguish patients with ACS from patients manifesting negative changes in electrocardiogram (ECG) and myocardial enzymes. This study aimed to investigate whether the expression of platelet carcinoembryonic antigen cell adhesion molecule-5 (CEACAM5/CEA/CD66e) could help predict ACS. Material/Methods We enrolled 82 participants (mean age 60 years, 33 females and 49 males). The expression of CEA on washed human platelets was assessed using two-color flow cytometry. The CEA levels on platelets and in serum of these 82 consecutive patients were detected using two-color whole-blood flow cytometry analysis and a custom-made Luminex multiplex assay, respectively. Results CEA was expressed on the surface of human platelets. The expression of platelet CEA (P<0.01), but not serum CEA (P=0.30), was significantly higher in patients with ACS compared to patients with normal coronary artery. Increased platelet CEA levels could serve as a new independent indicator for ACS (P=0.0003). Platelet CEA testing (P=0.000002), as well as cardiac troponin I (cTnI) (P=0.0005), can diagnose ACS with high sensitivity and specificity, and, combined with cTnI (P<0.0001), can improve the diagnostic value. Conclusions Platelet CEA expression was higher in individuals presenting with ACS. Hence, platelet CEA might be a novel and reliable biomarker for ACS. Large-scale studies are needed to confirm this hypothesis.
Collapse
Affiliation(s)
- Wen Wan
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Yujia Ye
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Huawei Wang
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Longjun Li
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Yajuan Gu
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Lai Yang
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Lihong Yang
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Han Liu
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Chao Meng
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Deng Li
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Zhe Wang
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| | - Zhaohui Meng
- Laboratory of Molecular Cardiology, Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China (mainland)
| |
Collapse
|
5
|
Identification of genetic risk factors associated with ischaemic stroke in young Mexican patients. NEUROLOGÍA (ENGLISH EDITION) 2019; 36:337-345. [DOI: 10.1016/j.nrleng.2018.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 01/10/2018] [Indexed: 11/18/2022] Open
|
6
|
Iwaszko A, Borowicz H, Graczyk S, Slowikowska M, Pliszczak-Krol A, Niedzwiedz A. Effect of antigen challenge on dynamics of CD62P and CD41/61 expression on platelets in horses with recurrent airway obstruction (RAO). Vet Immunol Immunopathol 2018; 202:172-180. [PMID: 30078592 DOI: 10.1016/j.vetimm.2018.07.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 06/30/2018] [Accepted: 07/09/2018] [Indexed: 12/20/2022]
Abstract
Recurrent airway obstruction (RAO), also known as heaves, is an allergic respiratory condition that develops in horses following an exposure to aeroallergens in hay and straw. This is manifested by airway hyperreactivity, inflammation, bronchoconstriction, as well as a leukocyte and platelet infiltration into the airways. Platelet activation and an increase in circulating platelet-leukocyte aggregates may lead to airway remodeling. The aim of this study was to explore the effect of seven-day antigen challenge on dynamics of platelet indices and CD41/61 and CD62 P expression on platelets in horses with RAO. Ten RAO-affected horses and ten healthy horses were included in this study. All horses were exposed to 7 days hay and straw challenge. Blood samples were collected prior to the challenge (Pre-challenge) and 1, 2, 3, 7 and 14 days after the initiating the antigen challenge. Blood samples were obtained to determine the platelet count (PLT), mean platelet volume (MPV) and platelet large cell ratio (P-LCR). Expression of CD62 P and CD41/61 was detected by flow cytometry on activated platelets. Antigen challenge resulted in a significant gradual decrease of PLT in RAO horses, but not in controls. MPV and P-LCR in control and RAO-affected horses remained unchanged after antigen challenge. The expression of CD62 P and CD41/61 in RAO horses was significantly higher compared to control horses. The antigen challenge resulted in an increase expression of CD62 P and CD41/61 on the platelets of RAO-affected horses, while did not lead to significant changes in the control group. An increased expression of CD62 P and CD41/61 indicates platelet activation what may contribute to the formation of platelet aggregates in their respiratory system.
Collapse
Affiliation(s)
- Alicja Iwaszko
- Department of Immunology, Pathophysiology and Veterinary Preventive Medicine, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland.
| | - Hieronim Borowicz
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland.
| | - Stanislaw Graczyk
- Department of Immunology, Pathophysiology and Veterinary Preventive Medicine, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland.
| | - Malwina Slowikowska
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland.
| | - Aleksandra Pliszczak-Krol
- Department of Immunology, Pathophysiology and Veterinary Preventive Medicine, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland.
| | - Artur Niedzwiedz
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland.
| |
Collapse
|
7
|
Jiménez-González MC, Santiago-Germán D, Castillo-Henkel EF, Alvarado-Moreno JA, Hernández-Juárez J, Leaños-Miranda A, Majluf-Cruz A, Isordia-Salas I. Identification of genetic risk factors associated with ischaemic stroke in young Mexican patients. Neurologia 2018. [PMID: 29526315 DOI: 10.1016/j.nrl.2018.01.010] [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: 02/08/2023] Open
Abstract
INTRODUCTION Numerous polymorphisms in candidate genes coding for haemostatic system proteins have been proposed as risk factors for thrombosis. METHODS We performed a case-control study of consecutive ischaemic stroke survivors aged ≤ 45 years, treated at our neurology department from 2006 to 2014. Polymerase chain reaction-restriction fragment length polymorphism identified the following polymorphisms: Thr325Ile and Ala147Thr in TAFI, 4G/5G in PAI-1, PLA1/A2 in platelet glycoprotein IIb/IIIa, Glu298Asp in eNOS, and C677T in 5,10-MTHFR. A multivariate logistic regression analysis was performed to evaluate the independent risk of stroke. RESULTS 204 cases and 204 age- and sex-matched controls were included in the study. Clinical and genetic variables associated with ischaemic stroke were hypertension (P=.03), tobacco use (P=.02), and the polymorphisms Glu298Asp (genotype: P=.001, allele frequency: P=.001) and C677T (genotype: P=.01); the Ala147Thr, Thr325IIe, 4G/5G, and PLA1/A2 mutations were not associated with ischaemic stroke. The 298Asp (P=.03) and T (P=.01) alleles, hypertension (P=.03), tobacco use (P=.01) and family history of stroke (P=.04) were identified as independent risk factors. CONCLUSIONS The polymorphisms Glu298Asp and C677T, affecting the eNOS and 5,10-MTHFR enzymes, respectively, and smoking, hypertension, and family history of stroke were associated with ischaemic stroke in young Mexican patients; this was not the case for the Thr325Ile, Ala147Thr, 4G/5G, and PLA1/A2 polymorphisms of the genes coding for fibrinolytic proteins and platelet receptors.
Collapse
Affiliation(s)
- M C Jiménez-González
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México, México
| | - D Santiago-Germán
- Servicio de Urgencias, H.G.R. No 1. Dr. Carlos Mac Gregor Sánchez Navarro, Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - E F Castillo-Henkel
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México, México
| | - J A Alvarado-Moreno
- Unidad de Investigación Médica en Trombosis, Hemostasia y Aterogénesis, H.G.R. No 1. Dr. Carlos Mac Gregor Sánchez Navarro, Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - J Hernández-Juárez
- Unidad de Investigación Médica en Trombosis, Hemostasia y Aterogénesis, H.G.R. No 1. Dr. Carlos Mac Gregor Sánchez Navarro, Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - A Leaños-Miranda
- Unidad de Investigación Médica en Medicina Reproductiva, UMAE HGO 4. Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - A Majluf-Cruz
- Unidad de Investigación Médica en Trombosis, Hemostasia y Aterogénesis, H.G.R. No 1. Dr. Carlos Mac Gregor Sánchez Navarro, Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - I Isordia-Salas
- Unidad de Investigación Médica en Trombosis, Hemostasia y Aterogénesis, H.G.R. No 1. Dr. Carlos Mac Gregor Sánchez Navarro, Instituto Mexicano del Seguro Social, Ciudad de México, México.
| |
Collapse
|
8
|
Voesch S, Htun P, Jorbenadze R, Geisler T, Gawaz M, Bocksch W, Fateh-Moghadam S. Platelet activation is less enhanced in the new balloon expandable Edwards Sapien 3 valve compared to its predecessor model (Edwards Sapien XT). Thromb Haemost 2017; 115:109-16. [DOI: 10.1160/th15-03-0267] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Accepted: 07/10/2015] [Indexed: 11/05/2022]
Abstract
SummaryStroke and thromboembolic events after transfemoral aortic valve replacement (TAVR) continue to be a problem. The aim of our study was to compare platelet aggregation (Agg) and platelet activation (PA) observed with two different catheter valves, the ESV-XT and the newer ESV-3 valve in patients (pts) undergoing TAVR on dual antiplatelet therapy (DAPT). A total of 174 patients with severe aortic stenosis and high surgical risk successfully underwent TAVR (60 ESV-XT; 114 ESV-3). Platelet Agg and PA (CD62P expression) were evaluated before and the following three days after TAVR under DAPT. Platelet Agg was inhibited to the same extent in both valve types and there was no significant difference in platelet drop between both valve types between day 0 and day 3 [ESV-XT vs ESV-3: median (25th-75th percentile): platelet count (x1000): 55 (42–74) vs 61(42–93), p=0.280]. However, there was an enhanced CD62P expression directly after TAVR with the ESV-XT compared to the ESV-3 [CD62P (MIF): 7.4 (6.8–8.6) vs 6.6 (6–7.9), p=0.014]. Surface expression of platelet CD62P was associated with the occurrence of residual aortic regurgitation (AR) and was significantly higher in patients with residual AR [CD62P (mild AR) vs CD 62P (no or trace AR): 7.9 (7.3–9.1) vs 7.1 (6.4–8.0), p < 0.001)]. PA was significantly enhanced in patients with the ESV-XT compared to the ESV-3 valve and was associated with the amount of residual AR which was significantly reduced by ESV-3. This may have implications for thromboembolic events following TAVR procedure
Collapse
|
9
|
Ostojic L, Zelenika D, Zotz RB, Sucker C, Ostojic Z, Loncar R. Platelet Receptor HPA-1 Polymorphism of αIIbβ3 and 807 C/T Polymorphism of α2β1 and Buerger's Disease. Angiology 2016; 58:169-74. [PMID: 17495265 DOI: 10.1177/0003319707300352] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Thromboangiitis obliterans or Buerger's disease is an episodic and segmental inflammatory and thrombotic process of the medium and small arteries of the lower extremities. Even though the disease was described 90 years ago, the etiopathogenesis is still under consideration. Afflicted patients are mostly young male cigarette smokers without signs of atherosclerosis or other risk factors for peripheral arterial occlusive disease. This indicates that hereditary thrombophilic factors could play a role in the etiopathogenesis. Recently, increasing evidence shows that platelet receptor polymorphisms (HPA-1 polymorphism of β3 subunit of αIIbβ3 and 807 C/T polymorphism α2β1) are associated with early onset of arterial thrombosis (myocardial infarction, stroke). This case-control study was designed to assess whether the 807 C/T polymorphism or the HPA-1 polymorphism is involved in the pathogenesis of Buerger's disease or has any influence on the clinical course of Buerger's disease. Eighteen patients with Buerger's disease and 81 (sex and age matched) healthy control subjects (mean age 44 ± 10 vs 45 8 years, respectively) were genotyped for platelet receptor HPA-1 and GPIa 807 C/T polymorphism. The gene frequency of HPA-1 and GPIa 807 C/T polymorphisms was identical in both groups. Prevalence of hetero- and homozygous carriers of the HPA-1b allel (1a1b and 1b1b genotype) as well as the prevalence of the 807 C/T and 807 T/T carriers did not differ significantly between the two groups, p >0.05. The grade of clinical disease manifestation as well as disease progression did not reveal any significant relationship with HPA-1 and 807 C/T polymorphisms. A relationship between the age at onset of the disease and HPA-1 polymorphism was not found. Otherwise analysis of the GPIa 807 C/T platelet receptor polymorphism showed that the average age of patients who are carriers of the T allele at early onset of disease was 32 ± 6 years (range 27—48 years) compared to 42 ± 6 years (range 34—53 years) of the C/C carriers (p <0.05). This indicates that the GPIa 807 C/T polymorphism does not represent a risk factor for Buerger's disease itself, but could be associated with premature onset of this disorder in predisposed individuals.
Collapse
Affiliation(s)
- L Ostojic
- Medical Faculty and University Clinic Mostar, Bijeli Brijeg BB, Mostar, Bosnia-Hercegovina.
| | | | | | | | | | | |
Collapse
|
10
|
Yazigi Junior JA, Gomes dos Santos JB, Xavier BR, Fernandes M, Valente SG, Leite VM. Quantificação do número de plaquetas a partir de diferentes métodos de centrifugação em ratos da linhagem SHR. Rev Bras Ortop 2015. [DOI: 10.1016/j.rbo.2015.04.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
11
|
Yazigi Junior JA, Dos Santos JBG, Xavier BR, Fernandes M, Valente SG, Leite VM. Quantification of platelets obtained by different centrifugation protocols in SHR rats. Rev Bras Ortop 2015; 50:729-38. [PMID: 27218087 PMCID: PMC4867912 DOI: 10.1016/j.rboe.2015.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 12/16/2014] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVE To quantify the platelet concentration in the blood of SHR rats, by means of different centrifugation protocols, and to evaluate what the most effective method for obtaining platelets is. METHODS We used 40 male rats of the isogenic SHR lineage. The animals were divided into three groups: control, using whole blood without centrifugation; single centrifugation, using whole blood subjected to a single centrifugation at 200 × g and 400 × g; and double centrifugation, using whole blood subjected one centrifugation at different rotations, followed by collection of whole plasma subjected to another centrifugation at different rotations: 200 × g + 200 × g; 200 × g + 400 × g; 200 × g + 800 × g; 400 × g + 400 × g; 400 × g + 800 × g. Samples of 3 ml of blood were drawn from each animal by means of cardiac puncture. The blood was stored in Vacutainer collection tubes containing 3.2% sodium citrate. The blood from the control group animals was analyzed without being subjected to centrifugation. After the blood from the other groups of animals had been subjected to centrifugation, the whole plasma was collected and subjected to platelet counting in the lower third of the sample. RESULTS We obtained greatest platelet enrichment in the subgroup with two centrifugations comprising 400 × g for 10 min + 400 × g for 10 min, in which the mean platelet concentration was 11.30 times higher than that of the control group. CONCLUSION It was possible to obtain a high platelet concentration using viable simple techniques, by means of centrifugation of whole blood and use of commonly used materials. The most effective method for obtaining platelet concentrate was found in samples subjected to two centrifugations.
Collapse
|
12
|
Gupta N, Li W, McIntyre TM. Deubiquitinases Modulate Platelet Proteome Ubiquitination, Aggregation, and Thrombosis. Arterioscler Thromb Vasc Biol 2015; 35:2657-66. [PMID: 26471267 DOI: 10.1161/atvbaha.115.306054] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 09/24/2015] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Platelets express a functional ubiquitin-proteasome system. Mass spectrometry shows that platelets contain several deubiquitinases, but whether these are functional, modulate the proteome, or affect platelet reactivity are unknown. APPROACH AND RESULTS Platelet lysates contained ubiquitin-protein deubiquitinase activity hydrolyzing both Lys48 and Lys63 polyubiquitin conjugates that was suppressed by the chemically unrelated deubiquitinase inhibitors PYR41 and PR619. These inhibitors acutely and markedly increased monoubiquitination and polyubiquitination of the proteome of resting platelets. PYR41 (intravenous, 15 minutes) significantly impaired occlusive thrombosis in FeCl3-damaged carotid arteries, and deubiquitinase inhibition reduced platelet adhesion and retention during high shear flow of whole blood through microfluidic chambers coated with collagen. Total internal reflection microscopy showed that adhesion and spreading in the absence of flow were strongly curtailed by these inhibitors with failure of stable process extension and reduced the retraction of formed clots. Deubiquitinase inhibition also sharply reduced homotypic platelet aggregation in response to not only the incomplete agonists ADP and collagen acting through glycoprotein VI but also to the complete agonist thrombin. Suppressed aggregation was accompanied by curtailed procaspase activating compound-1 binding to activated IIb/IIIa and inhibition of P-selectin translocation to the platelet surface. Deubiquitinase inhibition abolished the agonist-induced spike in intracellular calcium, suppressed Akt phosphorylation, and reduced agonist-stimulated phosphatase and tensin homolog phosphatase phosphorylation. Platelets express the proteasome-associated deubiquitinases USP14 and UCHL5, and selective inhibition of these enzymes by b-AP15 reproduced the inhibitory effect of the general deubiquitinase inhibitors on ex vivo platelet function. CONCLUSIONS Remodeling of the ubiquitinated platelet proteome by deubiquitinases promotes agonist-stimulated intracellular signal transduction and platelet responsiveness.
Collapse
Affiliation(s)
- Nilaksh Gupta
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland, OH; and Department of Molecular Medicine, Case Western Reserve University, Cleveland, OH
| | - Wei Li
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland, OH; and Department of Molecular Medicine, Case Western Reserve University, Cleveland, OH
| | - Thomas M McIntyre
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland, OH; and Department of Molecular Medicine, Case Western Reserve University, Cleveland, OH.
| |
Collapse
|
13
|
Granja T, Schad J, Schüssel P, Fischer C, Häberle H, Rosenberger P, Straub A. Using six-colour flow cytometry to analyse the activation and interaction of platelets and leukocytes – A new assay suitable for bench and bedside conditions. Thromb Res 2015; 136:786-96. [DOI: 10.1016/j.thromres.2015.07.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 07/03/2015] [Accepted: 07/08/2015] [Indexed: 11/28/2022]
|
14
|
Htun P, Nee J, Ploeckinger U, Eder K, Geisler T, Gawaz M, Bocksch W, Fateh-Moghadam S. Fish-Free Diet in Patients with Phenylketonuria Is Not Associated with Early Atherosclerotic Changes and Enhanced Platelet Activation. PLoS One 2015; 10:e0135930. [PMID: 26291823 PMCID: PMC4546235 DOI: 10.1371/journal.pone.0135930] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 07/28/2015] [Indexed: 11/25/2022] Open
Abstract
Background and Purpose Since patients with phenylketonuria (PKU) have to follow a lifelong restriction of natural protein to lower phenylalanine-intake, they never eat fish. This diet may lead to a chronic deficit of omega-3 and omega-6 fatty acids with the risk of early atherosclerotic changes. The aim of the study was to analyse the fatty acid profile of PKU patients and to correlate the results with surrogate markers of early atherosclerotic changes [enhanced carotid intima media thickness (CIMT) and ß-stiffness index] and platelet activation. Methods In 43 PKU patients and in 58 healthy controls we prospectively examined the fatty acid profile, CIMT, ß-stiffness index and platelet activation (flow cytometric determination of markers of platelet activation). CIMT was measured bilaterally by ultrasound. CIMT mean was defined as the mean value of the sum of CIMT left and CIMT right. Results Despite of lower HDL-cholesterol and higher triglyceride concentrations in the PKU group, there was no significant difference in the omega-6 or omega-3 fatty acid profile, CIMT, ß-stiffness index between both groups. Platelet activation was not enhanced in the PKU group. Conclusions Fish-free diet does not induce early atherosclerotic changes or enhanced platelet activation in PKU patients.
Collapse
Affiliation(s)
- Patrik Htun
- Zentrale Notaufnahme und Medizinische Klinik IV, Zentralklinikum Augsburg, Germany
| | - Jens Nee
- Medizinische Klinik mit Schwerpunkt Nephrologie und Intensivmedizin, Charite-Universitaetsmedizin Campus Virchow-Klinikum, Humboldt-Universitaet zu Berlin, Germany
| | - Ursula Ploeckinger
- Interdisziplinaeres Stoffwechsel-Centrum, Charite-Universitaetsmedizin Campus Virchow-Klinikum, Humboldt-Universitaet zu Berlin, Germany
| | - Klaus Eder
- Institut für Tierernährung und Ernährungsphysiologie, Justus-Liebig-Universität Giessen, Germany
| | - Tobias Geisler
- Medizinische Klinik III, Abteilung für Kardiologie und Kreislauferkrankungen, Eberhard-Karls Universitaet Tuebingen, Germany
| | - Meinrad Gawaz
- Medizinische Klinik III, Abteilung für Kardiologie und Kreislauferkrankungen, Eberhard-Karls Universitaet Tuebingen, Germany
| | - Wolfgang Bocksch
- Medizinische Klinik III, Abteilung für Kardiologie und Kreislauferkrankungen, Eberhard-Karls Universitaet Tuebingen, Germany
| | - Suzanne Fateh-Moghadam
- Medizinische Klinik III, Abteilung für Kardiologie und Kreislauferkrankungen, Eberhard-Karls Universitaet Tuebingen, Germany
- * E-mail:
| |
Collapse
|
15
|
Suh MJ, Tovchigrechko A, Thovarai V, Rolfe MA, Torralba MG, Wang J, Adkins JN, Webb-Robertson BJM, Osborne W, Cogen FR, Kaplowitz PB, Metz TO, Nelson KE, Madupu R, Pieper R. Quantitative Differences in the Urinary Proteome of Siblings Discordant for Type 1 Diabetes Include Lysosomal Enzymes. J Proteome Res 2015; 14:3123-35. [PMID: 26143644 DOI: 10.1021/acs.jproteome.5b00052] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Individuals with type 1 diabetes (T1D) often have higher than normal blood glucose levels, causing advanced glycation end product formation and inflammation and increasing the risk of vascular complications years or decades later. To examine the urinary proteome in juveniles with T1D for signatures indicative of inflammatory consequences of hyperglycemia, we profiled the proteome of 40 T1D patients with an average of 6.3 years after disease onset and normal or elevated HbA1C levels, in comparison with a cohort of 41 healthy siblings. Using shotgun proteomics, 1036 proteins were identified, on average, per experiment, and 50 proteins showed significant abundance differences using a Wilcoxon signed-rank test (FDR q-value ≤ 0.05). Thirteen lysosomal proteins were increased in abundance in the T1D versus control cohort. Fifteen proteins with functional roles in vascular permeability and adhesion were quantitatively changed, including CD166 antigen and angiotensin-converting enzyme 2. α-N-Acetyl-galactosaminidase and α-fucosidase 2, two differentially abundant lysosomal enzymes, were detected in western blots with often elevated quantities in the T1D versus control cohort. Increased release of proteins derived from lysosomes and vascular epithelium into urine may result from hyperglycemia-associated inflammation in the kidney vasculature.
Collapse
Affiliation(s)
- Moo-Jin Suh
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Andrey Tovchigrechko
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Vishal Thovarai
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Melanie A Rolfe
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Manolito G Torralba
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Junmin Wang
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Joshua N Adkins
- ‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| | - Bobbie-Jo M Webb-Robertson
- ‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| | - Whitney Osborne
- §Children's National Medical Center, 111 Michigan Avenue North West, Washington, DC 20010, United States
| | - Fran R Cogen
- §Children's National Medical Center, 111 Michigan Avenue North West, Washington, DC 20010, United States
| | - Paul B Kaplowitz
- §Children's National Medical Center, 111 Michigan Avenue North West, Washington, DC 20010, United States
| | - Thomas O Metz
- ‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| | - Karen E Nelson
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Ramana Madupu
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Rembert Pieper
- †J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850, United States
| |
Collapse
|
16
|
De Luca G, Savonitto S, van’t Hof AWJ, Suryapranata H. Platelet GP IIb-IIIa Receptor Antagonists in Primary Angioplasty: Back to the Future. Drugs 2015; 75:1229-53. [DOI: 10.1007/s40265-015-0425-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
17
|
Expression of surface platelet receptors (CD62P and CD41/61) in horses with recurrent airway obstruction (RAO). Vet Immunol Immunopathol 2015; 164:87-92. [PMID: 25665521 DOI: 10.1016/j.vetimm.2015.01.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/01/2014] [Accepted: 01/06/2015] [Indexed: 12/23/2022]
Abstract
Recurrent airway obstruction (RAO) is an allergic disease of horses similar to human asthma, which is characterized by airway inflammation and activation of neutrophils, lymphocytes and platelets. Platelet activation and an increase in circulating platelet-leukocyte aggregates may lead to airway remodeling. The aim of this study was to investigate platelet status in RAO-affected horses based on the platelet morphology and platelet surface expression of CD41/61 and CD62P. Ten RAO-affected horses and ten healthy horses were included in this study. Blood samples were obtained to determine the platelet count (PLT), mean platelet volume (MPV) and platelet large cell ratio (P-LCR). Expression of CD62P and CD41/61 was detected by flow cytometry on activated platelets. The median PLT was significantly reduced in horses with RAO compared to the controls. The MPV and the P-LCR values were significantly higher in RAO horses than controls. Expression of CD41/61 on platelets was increased in RAO horses, while CD62P expression was reduced. This study demonstrated the morphological changes in platelets and expression of platelet surface receptors. Despite the decrease of CD62P expression, the observed increased surface expression of CD41/61 on platelets in horses with RAO may contribute to the formation of platelet aggregates in their respiratory system.
Collapse
|
18
|
[Antiplatelet therapy in acute coronary syndrome. Prehospital phase: nothing, aspirin or what?]. Herz 2014; 39:803-7. [PMID: 25315248 DOI: 10.1007/s00059-014-4157-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In most cases of ST segment elevation myocardial infarction (STEMI) a major coronary vessel is occluded by a thrombus. This is why early and effective antiplatelet therapy plays a key role. The current guidelines recommend the administration of dual antiplatelet therapy as early as possible. Despite the lack of convincing clinical evidence, prehospital administration appears reasonable, primarily because of pharmacokinetic considerations. Ticagrelor should be preferentially administered because the largest amount of evidence is available and it appears to be safe. In high-risk patients undergoing transfer to a catheterization laboratory, upstream use of a glycoprotein (GP) IIb/IIIa receptor antagonist (tirofiban) may be considered. Acute coronary syndrome without ST segment elevation (NSTE-ACS) represents a clinically heterogeneous group. Current guidelines recommend that antiplatelet therapy should be initiated as early as possible when the diagnosis of NSTE-ACS is made. If there is high clinical suspicion of NSTE-ACS acetylsalicylic acid (ASA) should be given before hospital admission. In high-risk patients prehospital administration of ticagrelor may be considered.
Collapse
|
19
|
Geraldo RB, Sathler PC, Lourenço AL, Saito MS, Cabral LM, Rampelotto PH, Castro HC. Platelets: still a therapeutical target for haemostatic disorders. Int J Mol Sci 2014; 15:17901-19. [PMID: 25295482 PMCID: PMC4227196 DOI: 10.3390/ijms151017901] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 08/26/2014] [Accepted: 09/23/2014] [Indexed: 11/16/2022] Open
Abstract
Platelets are cytoplasmatic fragments from bone marrow megakaryocytes present in blood. In this work, we review the basis of platelet mechanisms, their participation in syndromes and in arterial thrombosis, and their potential as a target for designing new antithrombotic agents. The option of new biotechnological sources is also explored.
Collapse
Affiliation(s)
- Reinaldo Barros Geraldo
- Programa de Pós-graduação em Ciências e Biotecnologia, Instituto de Biologia, Universidade Federal Fluminense (UFF), Niterói CEP 24210-130, RJ, Brazil.
| | - Plínio Cunha Sathler
- Programa de Pós-graduação em Patologia, Departamento de Patologia, Hospital Universitário Antônio Pedro (HUAP), Universidade Federal Fluminense (UFF), Niterói CEP 24030-215, RJ, Brazil.
| | - André Luiz Lourenço
- Programa de Pós-graduação em Patologia, Departamento de Patologia, Hospital Universitário Antônio Pedro (HUAP), Universidade Federal Fluminense (UFF), Niterói CEP 24030-215, RJ, Brazil.
| | - Max Seidy Saito
- Programa de Pós-graduação em Patologia, Departamento de Patologia, Hospital Universitário Antônio Pedro (HUAP), Universidade Federal Fluminense (UFF), Niterói CEP 24030-215, RJ, Brazil.
| | - Lucio M Cabral
- LabTIF, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro CEP 21941-590, RJ, Brazil.
| | - Pabulo Henrique Rampelotto
- Interdisciplinary Center for Biotechnology Research, Federal University of Pampa, Antônio Trilha Avenue, P.O. Box 1847, São Gabriel/RS 97300-000, Brazil.
| | - Helena Carla Castro
- Programa de Pós-graduação em Ciências e Biotecnologia, Instituto de Biologia, Universidade Federal Fluminense (UFF), Niterói CEP 24210-130, RJ, Brazil.
| |
Collapse
|
20
|
Wurster T, Tegtmeyer R, Borst O, Rath D, Geisler T, Gawaz M, Bigalke B. Platelet expression of stromal cell-derived factor-1 is associated with the degree of valvular aortic stenosis. PLoS One 2014; 9:e97405. [PMID: 24834915 PMCID: PMC4023969 DOI: 10.1371/journal.pone.0097405] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 04/19/2014] [Indexed: 11/18/2022] Open
Abstract
Background and Purpose Platelet surface expression of stromal-cell-derived factor-1 (SDF-1) is increased during platelet activation and constitutes an important factor in hematopoetic progenitor cell trafficking at sites of vascular injury and ischemia. Enhanced platelet SDF-1 expression has been reported previously in patients suffering from acute coronary syndrome (ACS). We hypothesized that expression of platelet associated SDF-1 may also be influenced by calcified valvular aortic stenosis (AS). Methods We consecutively evaluated 941 patients, who were admitted to the emergency department with dyspnea and chest pain. Platelet surface expression of SDF-1 was determined by flow cytometry, AS was assessed using echocardiography and hemodynamic assessment by heart catheterization. A 1∶1 propensity score matching was implemented to match 218 cases with 109 pairs adjusting for age, sex, cardiovascular risk factors, and medication including ACE inhibitors, angiotensin receptor blockers, beta blockers, statins, aspirin, clopidogrel, GPIIb/IIIa antagonists, and vitamin K antagonists. Results Patients with valvular AS showed enhanced platelet SDF-1 expression compared to patients without AS (non-valvular disease, NV) independent of ACS and stable coronary artery disease (SAP) [mean fluorescence intensity (MFI) for ACS (AS vs. NV): 75±40.4 vs. 39.5±23.3; P = 0.002; for SAP (AS vs. NV): 54.9±44.6 vs. 24.3±11.2; P = 0.008]. Moreover, the degree of AS significantly correlated with SDF-1 platelet surface expression (r = 0.462; P = 0.002). Conclusions Valvular AS is associated with enhanced platelet-SDF-1 expression; moreover the degree of valvular AS correlates with SDF-1 platelet surface expression. These findings may have clinical implications in the future.
Collapse
Affiliation(s)
- Thomas Wurster
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Roland Tegtmeyer
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Oliver Borst
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Dominik Rath
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Tobias Geisler
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Meinrad Gawaz
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Boris Bigalke
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany; King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom
| |
Collapse
|
21
|
Neffe AT, von Ruesten-Lange M, Braune S, Lützow K, Roch T, Richau K, Krüger A, Becherer T, Thünemann AF, Jung F, Haag R, Lendlein A. Multivalent grafting of hyperbranched oligo- and polyglycerols shielding rough membranes to mediate hemocompatibility. J Mater Chem B 2014; 2:3626-3635. [DOI: 10.1039/c4tb00184b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multivalent attachment of branched polyethers is a successful strategy in shielding rough surfaces, different from rules established on flat model surfaces.
Collapse
Affiliation(s)
- Axel T. Neffe
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Institute of Chemistry
- University of Potsdam
- Germany
| | - Maik von Ruesten-Lange
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Institute of Chemistry
- University of Potsdam
- Germany
| | - Steffen Braune
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Institute of Chemistry
- University of Potsdam
- Germany
| | - Karola Lützow
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Helmholtz Virtual Institute – Multifunctional Biomaterials for Medicine
- Teltow and Berlin, Germany
| | - Toralf Roch
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Helmholtz Virtual Institute – Multifunctional Biomaterials for Medicine
- Teltow and Berlin, Germany
| | - Klaus Richau
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
| | - Anne Krüger
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
| | - Tobias Becherer
- Helmholtz Virtual Institute – Multifunctional Biomaterials for Medicine
- Teltow and Berlin, Germany
- Institute of Chemistry and Biochemistry
- Freie Universität Berlin
- Germany
| | | | - Friedrich Jung
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Helmholtz Virtual Institute – Multifunctional Biomaterials for Medicine
- Teltow and Berlin, Germany
| | - Rainer Haag
- Helmholtz Virtual Institute – Multifunctional Biomaterials for Medicine
- Teltow and Berlin, Germany
- Institute of Chemistry and Biochemistry
- Freie Universität Berlin
- Germany
| | - Andreas Lendlein
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies
- 14513 Teltow, Germany
- Institute of Chemistry
- University of Potsdam
- Germany
| |
Collapse
|
22
|
Jorbenadze R, Schleicher E, Bigalke B, Stellos K, Gawaz M. Expression of platelet-bound stromal-cell derived factor-1 (SDF-1) and number of CD34+progenitor cells in patients with congestive heart failure. Platelets 2013; 25:409-15. [DOI: 10.3109/09537104.2013.829913] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
23
|
Zhai W, Qiu LJ, Mo XM, Wang S, Xu YF, Peng B, Liu M, Huang JH, Wang GC, Zheng JH. Coaxial electrospinning of P(LLA-CL)/heparin biodegradable polymer nanofibers: potential vascular graft for substitution of femoral artery. J Biomed Mater Res B Appl Biomater 2013:471-478. [PMID: 23744736 DOI: 10.1002/jbm.b.32972] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 03/28/2013] [Accepted: 04/21/2013] [Indexed: 11/05/2022]
Affiliation(s)
- Wei Zhai
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Li-jun Qiu
- Institute of Biological Engineering; Donghua University; Shanghai 201620 China
| | - Xiu-mei Mo
- Institute of Biological Engineering; Donghua University; Shanghai 201620 China
| | - Sheng Wang
- Department of Intensive Care Unit; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Yun-fei Xu
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Bo Peng
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Min Liu
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Jun-hua Huang
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Guang-chun Wang
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| | - Jun-hua Zheng
- Department of Urology; Shanghai Tenth People's Hospital, Tongji University School of Medicine; Shanghai 200072 China
| |
Collapse
|
24
|
Wurster T, Stellos K, Haap M, Seizer P, Geisler T, Otton J, Indermuehle A, Ishida M, Schuster A, Nagel E, Gawaz M, Bigalke B. Platelet expression of stromal-cell-derived factor-1 (SDF-1): An indicator for ACS? Int J Cardiol 2013; 164:111-5. [DOI: 10.1016/j.ijcard.2011.06.082] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 05/17/2011] [Accepted: 06/15/2011] [Indexed: 11/26/2022]
|
25
|
Antithrombotic and anticoagulant effects of direct factor Xa inhibitor darexaban in rat and rabbit models of venous thrombosis. Eur J Pharmacol 2013. [DOI: 10.1016/j.ejphar.2012.11.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
26
|
Intracellular cyclophilin A is an important Ca(2+) regulator in platelets and critically involved in arterial thrombus formation. Blood 2012; 120:1317-26. [PMID: 22740452 DOI: 10.1182/blood-2011-12-398438] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Platelet adhesion and aggregation play a critical role in primary hemostasis. Uncontrolled platelet activation leads to pathologic thrombus formation and organ failure. The decisive central step for different processes of platelet activation is the increase in cytosolic Ca(2+) activity ([Ca(2+)](i)). Activation-dependent depletion of intracellular Ca(2+) stores triggers Ca(2+) entry from the extracellular space. Stromal interaction molecule 1 (STIM1) has been identified as a Ca(2+) sensor that regulates store-operated Ca(2+) entry through activation of the pore-forming subunit Orai1, the major store-operated Ca(2+) entry channel in platelets. In the present study, we show for the first time that the chaperone protein cyclophilin A (CyPA) acts as a Ca(2+) modulator in platelets. CyPA deficiency strongly blunted activation-induced Ca(2+) mobilization from intracellular stores and Ca(2+) influx from the extracellular compartment and thus impaired platelet activation substantially. Furthermore, the phosphorylation of the Ca(2+) sensor STIM1 was abrogated upon CyPA deficiency, as shown by immunoprecipitation studies. In a mouse model of arterial thrombosis, CyPA-deficient mice were protected against arterial thrombosis, whereas bleeding time was not affected. The results of the present study identified CyPA as an important Ca(2+) regulator in platelets, a critical mechanism for arterial thrombosis.
Collapse
|
27
|
Krajewski S, Kurz J, Geisler T, Peter K, Wendel HP, Straub A. Combined blockade of ADP receptors and PI3-kinase p110β fully prevents platelet and leukocyte activation during hypothermic extracorporeal circulation. PLoS One 2012; 7:e38455. [PMID: 22701645 PMCID: PMC3368839 DOI: 10.1371/journal.pone.0038455] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 05/05/2012] [Indexed: 11/19/2022] Open
Abstract
Extracorporeal circulation (ECC) and hypothermia are used to maintain stable circulatory parameters and improve the ischemia tolerance of patients in cardiac surgery. However, ECC and hypothermia induce activation mechanisms in platelets and leukocytes, which are mediated by the platelet agonist ADP and the phosphoinositide-3-kinase (PI3K) p110β. Under clinical conditions these processes are associated with life-threatening complications including thromboembolism and inflammation. This study analyzes effects of ADP receptor P2Y12 and P2Y1 blockade and PI3K p110β inhibition on platelets and granulocytes during hypothermic ECC. Human blood was treated with the P2Y12 antagonist 2-MeSAMP, the P2Y1 antagonist MRS2179, the PI3K p110β inhibitor TGX-221, combinations thereof, or PBS and propylene glycol (controls). Under static in vitro conditions a concentration-dependent effect regarding the inhibition of ADP-induced platelet activation was found using 2-MeSAMP or TGX-221. Further inhibition of ADP-mediated effects was achieved with MRS2179. Next, blood was circulated in an ex vivo ECC model at 28°C for 30 minutes and various platelet and granulocyte markers were investigated using flow cytometry, ELISA and platelet count analysis. GPIIb/IIIa activation induced by hypothermic ECC was inhibited using TGX-221 alone or in combination with P2Y blockers (p<0.05), while no effect of hypothermic ECC or antiplatelet agents on GPIIb/IIIa and GPIbα expression and von Willebrand factor binding was observed. Sole P2Y and PI3K blockade or a combination thereof inhibited P-selectin expression on platelets and platelet-derived microparticles during hypothermic ECC (p<0.05). P2Y blockade alone or combined with TGX-221 prevented ECC-induced platelet-granulocyte aggregate formation (p<0.05). Platelet adhesion to the ECC surface, platelet loss and Mac-1 expression on granulocytes were inhibited by combined P2Y and PI3K blockade (p<0.05). Combined blockade of P2Y12, P2Y1 and PI3K p110β completely inhibits hypothermic ECC-induced activation processes. This novel finding warrants further studies and the development of suitable pharmacological agents to decrease ECC- and hypothermia-associated complications in clinical applications.
Collapse
Affiliation(s)
- Stefanie Krajewski
- Department of Anesthesiology and Intensive Care Medicine, University of Tübingen, Tübingen, Germany.
| | | | | | | | | | | |
Collapse
|
28
|
Ishikawa T, Shimizu M, Kohara S, Takizawa S, Kitagawa Y, Takagi S. Appearance of WBC-Platelet Complex in Acute Ischemic Stroke, Predominantly in Atherothrombotic Infarction. J Atheroscler Thromb 2012; 19:494-501. [DOI: 10.5551/jat.10637] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
|
29
|
Stellos K, Panagiota V, Gnerlich S, Borst O, Bigalke B, Gawaz M. Expression of Junctional Adhesion Molecule-C on the Surface of Platelets Supports Adhesion, but not Differentiation, of Human CD34 + Cells in Vitro. Cell Physiol Biochem 2012; 29:153-62. [DOI: 10.1159/000337596] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/29/2011] [Indexed: 12/15/2022] Open
|
30
|
Stellos K, Rahmann A, Kilias A, Ruf M, Sopova K, Stamatelopoulos K, Jorbenadze R, Weretka S, Geisler T, Gawaz M, Weig HJ, Bigalke B. Expression of platelet-bound stromal cell-derived factor-1 in patients with non-valvular atrial fibrillation and ischemic heart disease. J Thromb Haemost 2012; 10:49-55. [PMID: 22044645 DOI: 10.1111/j.1538-7836.2011.04547.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS Blood cell infiltration and inflammation are involved in atrial remodelling during atrial fibrillation (AF) although the exact mechanisms of inflammatory cell recruitment remain poorly understood. Platelet-bound stromal cell-derived factor-1 (SDF-1) is increased in cases of ischemic myocardium and regulates recruitment of CXCR4(+) cells on the vascular wall. Whether platelet-bound SDF-1 expression is differentially influenced by non-valvular paroxysmal or permanent atrial fibrillation (AF) in patients with stable angina pectoris (SAP) or acute coronary syndrome (ACS) has not been reported so far. METHODS AND RESULTS A total of 1291 consecutive patients with coronary artery disease (CAD) undergoing coronary angiography were recruited. Among the patients with SAP, platelet-bound-SDF-1 is increased in patients with paroxysmal AF compared with SR or to persistent/permanent AF (P < 0.05 for both). Platelet-bound SDF-1 correlated with plasma SDF-1 (r = 0.488, P = 0.013) in patients with AF and ACS, which was more pronounced among patients with persistent AF (r = 0.842, P = 0.009). Plasma SDF-1 was increased in persistent/permanent AF compared with SR. Patients with ACS presented with enhanced platelet-bound-SDF-1 compared with SAP. Interestingly, among patients with ACS, patients with paroxysmal or persistent/permanent AF presented with an impaired platelet-bound SDF-1 expression compared with patients with SR. CONCLUSIONS Differential expression of platelet-bound and plasma SDF-1 was observed in patients with AF compared with SR which may be involved in progenitor cell mobilization and inflammatory cell recruitment in patients with AF and ischemic heart disease. Further in vivo studies are required to elucidate the role of SDF-1 in atrial remodeling and the atrial fibrillation course.
Collapse
Affiliation(s)
- Konstantinos Stellos
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard Karls-Universität Tübingen, Tübingen, Germany.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Saad AA, Ismail EAR, Darwish YW, Nasr HA, Hassan AR, Bedeer I, Alfons MA. Platelet function profile post-clopidogrel therapy in patients with type 2 diabetes undergoing coronary stent implantation. Clin Appl Thromb Hemost 2011; 18:249-57. [PMID: 22146578 DOI: 10.1177/1076029611427899] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Platelet dysfunction contributes to the increased risk of thromboischemic complications after percutaneous coronary intervention (PCI), particularly in type 2 diabetes. Little is known about the effects of glycemic control on platelet reactivity. We assessed adenosine diphosphate-induced platelet aggregation and flow cytometric expression of P-selectin in 90 patients (56 diabetic and 34 nondiabetic patients) undergoing coronary stent implantation after administration of clopidogrel as a potential predictor of poststent complications and its relation to glycemic control. Posttreatment platelet reactivity was significantly elevated in diabetic compared with nondiabetic participants and was associated with smoking, hypercholesterolemia, overweight, and cardiovascular ischemic events. A linear relationship was found between hemoglobin A1c in diabetic patients and platelet reactivity. Both methods (standard aggregometry and P-selectin expression) used for assessment of platelet function were positively correlated. Low responsiveness to clopidogrel detected by posttreatment platelet reactivity is a risk factor for ischemic events after PCI in diabetic patients.
Collapse
Affiliation(s)
- Abeer Attia Saad
- Clinical Pathology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | | | | | | | | | | | | |
Collapse
|
32
|
Krajewski S, Kurz J, Wendel HP, Straub A. Flow cytometry analysis ofporcineplatelets: Optimized methods for best results. Platelets 2011; 23:386-94. [DOI: 10.3109/09537104.2011.624209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
33
|
Wurster T, Stellos K, Geisler T, Seizer P, Andia ME, Schuster A, May AE, Melms A, Gawaz M, Bigalke B. Expression of stromal‐cell‐derived factor‐1 (SDF‐1): a predictor of ischaemic stroke? Eur J Neurol 2011; 19:395-401. [DOI: 10.1111/j.1468-1331.2011.03527.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- T. Wurster
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - K. Stellos
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - T. Geisler
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - P. Seizer
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - M. E. Andia
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, King’s College London, The Rayne Institute, London, UK
| | - A. Schuster
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, King’s College London, The Rayne Institute, London, UK
| | - A. E. May
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - A. Melms
- Center for Neurology, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - M. Gawaz
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
| | - B. Bigalke
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard‐Karls‐Universität Tübingen, Tübingen, Germany
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, King’s College London, The Rayne Institute, London, UK
| |
Collapse
|
34
|
Bigalke B, Stellos K, Geisler T, Kremmer E, Seizer P, May AE, Lindemann S, Gawaz M. Glycoprotein VI for diagnosis of acute coronary syndrome when ECG is ambiguous. Int J Cardiol 2011; 149:164-168. [DOI: 10.1016/j.ijcard.2009.12.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 10/26/2009] [Accepted: 12/19/2009] [Indexed: 10/20/2022]
|
35
|
Htun P, Kahl A, Frei U, Gawaz M, Fateh-Moghadama S. Persistent platelet activation after simultaneous pancreas-kidney transplantation (SPKT) in patients with end-stage renal disease (ESRD) and diabetes type I (DM-I). Thromb Res 2011; 127:378-81. [PMID: 21316745 DOI: 10.1016/j.thromres.2010.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Revised: 07/15/2010] [Accepted: 07/15/2010] [Indexed: 11/19/2022]
|
36
|
Guenther F, von zur Muhlen C, Ferrante EA, Grundmann S, Bode C, Klibanov AL. An ultrasound contrast agent targeted to P-selectin detects activated platelets at supra-arterial shear flow conditions. Invest Radiol 2010; 45:586-91. [PMID: 20808239 PMCID: PMC3426507 DOI: 10.1097/rli.0b013e3181ed1b3b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES To evaluate targeting of a microbubble contrast agent to platelets under high shear flow using the natural selectin ligand sialyl Lewis. MATERIALS AND METHODS Biotinylated polyacrylamide Sialyl Lewis or biotinylated carbohydrate-free polymer (used as a control) were attached to biotinylated microbubbles via a streptavidin linker. Activated human platelets were isolated and attached to fibrinogen-coated culture dishes. Fibrinogen-coated dishes without platelets or platelet dishes blocked by an anti-P-selectin antibody served as negative control substrates. Dishes coated by recombinant P-selectin served as a positive control substrate. Microbubble adhesion was assessed by microscopy in an inverted parallel plate flow chamber, with wall shear stress values of 40, 30, 20, 10, and 5 dynes/cm2. The ratio of binding and passing microbubbles was defined as capture efficiency. RESULTS There was no significant difference between the groups regarding the number of microbubbles in the fluid flow at each shear rate. Sialyl Lewis-targeted microbubbles were binding and slowly rolling on the surface of activated platelets and P-selectin-coated dishes at all the flow conditions including 40 dynes/cm2. Capture efficiency of targeted microbubbles to activated platelets and recombinant P-selectin decreased with increasing shear flow: at 5 dynes/cm2, capture efficiency was 16.11% on activated platelets versus 21.83% on P-selectin, and, at 40 dynes/cm2, adhesion efficiency was still 3.4% in both groups. There was neither significant adhesion of Sialyl Lewis-targeted microbubbles to control substrates, nor adhesion of control microbubbles to activated platelets or to recombinant P-selectin. CONCLUSIONS Microbubble targeting using sialyl Lewis, a fast-binding ligand to P-selectin, is a promising strategy for the design of ultrasound contrast binding to activated platelets under high shear stress conditions.
Collapse
Affiliation(s)
- Felix Guenther
- Department of Cardiology and Angiology, University Hospital of Freiburg, Freiburg, Germany.
| | | | | | | | | | | |
Collapse
|
37
|
Stellos K, Bigalke B, Stakos D, Henkelmann N, Gawaz M. Platelet-bound P-selectin expression in patients with coronary artery disease: impact on clinical presentation and myocardial necrosis, and effect of diabetes mellitus and anti-platelet medication. J Thromb Haemost 2010; 8:205-7. [PMID: 19874461 DOI: 10.1111/j.1538-7836.2009.03659.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
38
|
Sambola A, Heras M, Escolar G, Lozano M, Pino M, Martorell T, Torra M, Sanz G. The PFA-100® detects sub-optimal antiplatelet responses in patients on aspirin. Platelets 2009; 15:439-46. [PMID: 15745315 DOI: 10.1080/69537100412351272550] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Although it is suspected that some patients with acute coronary syndromes (ACS) could have a sub-optimal response to aspirin (SASAR), currently a fixed dose of ASA is long-term used in all individuals. This study was designed to determine SASAR and whether a SASAR is a predictor for recurrence of ischemic events in patients on low-dose ASA with a previous ACS. One hundred patients taking ASA 100 mg/day were assessed at 1 and 6 months after a first ACS. SASAR was initially defined as a failure of the ASA treatment to significantly prolong the closure time in the Platelet Function Analyzer (PFA-100). SASAR in these samples was reconfirmed by conventional aggregometry. TXB2 levels were determined in plasma. At one month 49 patients showed SASAR in the PFA-100; only 25 of them showed SASAR by conventional aggregometry. At six months, 39 of 81 patients showed SASAR by PFA-100, but conventional aggregometry detected SASAR in only 12 of the 39 patients. TXB2 levels were significantly higher in patients with SASAR. Five patients with SASAR, by both tests, died during follow-up (p = 0.013). The PFA-100 detected a high rate of SASAR in patients with ACS. This instrument could be used to screen for suboptimal response to the antiplatelet action of ASA. Whether persistence of SASAR could relate to a higher risk of recurrence and how adjusting the dose of ASA could reduce the rate of SASAR are issues that deserve further investigations.
Collapse
Affiliation(s)
- A Sambola
- Cardiovascular Institute, University of Barcelona, Spain
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Löffler C, Straub A, Bassler N, Pernice K, Beyersdorf F, Bode C, Siegenthaler MP, Peter K. Evaluation of platelet activation in patients supported by the Jarvik 2000* high-rotational speed impeller ventricular assist device. J Thorac Cardiovasc Surg 2009; 137:736-41. [PMID: 19258099 DOI: 10.1016/j.jtcvs.2008.09.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Revised: 08/16/2008] [Accepted: 09/06/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVE The Jarvik 2000 (Jarvik Heart, Inc, New York, NY) is a thumb-sized high-speed impeller pump that is used as a ventricular assist device in patients with terminal heart failure. Because the Jarvik 2000 is designed for long-term use, it is a central question whether the mechanical forces inside the pump affect blood components. This study evaluated the potential association of the high rotational speed of the Jarvik 2000 with platelet activation, which may result in thromboembolic events. METHODS The study group comprised patients with terminal heart failure who were supported with the Jarvik 2000. All were men and received 100 mg aspirin daily. In 8 patients, soluble platelet activation markers (P-selectin and sCD40L), platelet counts, and hemolysis markers (haptoglobin and lactate dehydrogenase levels) were determined. In 5 patients, P-selectin expression and platelet receptor glycoprotein IIb/IIIa activation were determined with flow cytometry and compared with a control group of 5 healthy men. Platelet activation was measured at various rotational device speeds. RESULTS After Jarvik 2000 implantation, increased hemolysis was observed, but platelet activation markers and platelet counts were not affected. Increased rotational speed (8000 to 12,000 rpm) of the device also did not result in increased platelet activation. CONCLUSION The Jarvik 2000 was not associated with detectable platelet activation, despite high rotational impeller speeds.
Collapse
Affiliation(s)
- Christoph Löffler
- Department of Cardiology and Angiology, University Hospital, Albert-Ludwigs-University, Freiburg, Germany
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Osmancik PP, Bednar F, Pavkova L, Tousek P, Stros P, Jirasek K. Higher platelet activity is present in patients with restenosis after percutaneous coronary intervention compared with patients with an occlusion of coronary artery bypass graft. Blood Coagul Fibrinolysis 2008; 19:807-12. [PMID: 19002048 DOI: 10.1097/mbc.0b013e3283169223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The aim of the study was to compare platelet activity between patients with an occlusion of bypass graft after coronary artery bypass graft surgery and restenosis after percutaneous coronary intervention (PCI); that is, between patients with reappearance of ischemia after two different kinds of coronary revascularization. Thirty patients were studied in a cross-sectional designed study. Fifteen of them were patients with the worst bypass graft patency from Prague-4 study (control protocol-driven coronary angiography performed at 1 year after surgery; originally 47 bypass grafts implanted, 94% of venous grafts occluded). The remaining 15 were patients with restenosis 3-12 months after PCI. Blood samples were drawn at least 12 weeks after coronary angiography. Platelet activity was determined by membrane expression of P-selectin (CD62P, % of positive cells) by flow cytometry, aggregability by ADP aggregometry. Data are expressed as mean +/- SEM. Both groups were similar with respect to age, BMI and presence of diabetes mellitus. No patient suffered from acute coronary syndrome. P-selectin expression was significantly higher in the patients with restenosis compared with patients with bypass graft occlusion (1.96 +/- 0.07 vs. 0.77 +/- 0.03, P < 0.001, Wilcoxon test). ADP aggregometry was not different between groups (55.5 +/- 1.1 vs. 56.1 +/- 0.8, P = NS). Higher platelet activity is present in the patients with restenosis after PCI compared with the patients with the occlusion of bypass graft. Platelet activity play more important role in the development of restenosis after PCI compared with the occlusion of bypass graft after coronary artery bypass graft surgery, at least in the period up to 1 year after revascularization.
Collapse
Affiliation(s)
- Pavel P Osmancik
- Cardiocenter, Department of Cardiology, Charles University, University Hospital Kralovske Vinohrady Prague, Czech Republic.
| | | | | | | | | | | |
Collapse
|
41
|
Bigalke B, Geisler T, Stellos K, Langer H, Daub K, Kremmer E, Seizer P, May AE, Lindemann S, Gawaz M. Platelet collagen receptor glycoprotein VI as a possible novel indicator for the acute coronary syndrome. Am Heart J 2008; 156:193-200. [PMID: 18585516 DOI: 10.1016/j.ahj.2008.02.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2007] [Accepted: 02/18/2008] [Indexed: 11/20/2022]
Abstract
BACKGROUND Platelet collagen receptor glycoprotein VI (GPVI) plays a critical role in acute coronary thrombosis. This prospective study examined the predictive value of GPVI for acute coronary syndromes (ACS) in a large consecutive group of patients with symptomatic coronary artery disease to identify the high-risk cohort with imminent coronary events. METHODS We evaluated 1,003 patients with symptomatic coronary artery disease, verified by coronary angiography, and determined the surface expression of GPVI using flow cytometry. In a subgroup of 471 patients, who were treated with aspirin plus clopidogrel for coronary stenting, adenosine disphosphate (20 micromol/L)-induced platelet aggregation was evaluated. RESULTS Patients with ACS (n = 485) showed a significantly enhanced GPVI expression compared to patients with stable angina pectoris (SAP; n = 518) (mean fluorescence intensity for ACS 19.8 +/- 5.9; SAP 18.7 +/- 8.5, P = .01). Patients with elevated GPVI levels on admission (GPVI cutoff value > or =18.6 mean fluorescence intensity) had a 1.4-fold relative risk for ACS. Logistic regression analysis showed that an elevated platelet GPVI level may indicate ACS independent of biomarkers of myocardial necrosis including troponin, creatine kinase, and creatine kinase-MB. Patients with increased platelet activation (GPVI expression level > or =18.6) showed significant enhanced residual platelet aggregation despite dual antiplatelet therapy compared to patients with low GPVI levels (P = .028). CONCLUSIONS Surface expression of GPVI is enhanced in patients with ACS and indicates an imminent acute coronary event before irreversible myocardial necrosis is evident. High GPVI levels are associated with increased residual platelet aggregation despite antiplatelet therapy. Therefore, GPVI is useful to identify the subgroup of patients with a high risk for coronary stent thrombosis and thromboischemic events.
Collapse
Affiliation(s)
- Boris Bigalke
- Medizinische Klinik, Klinik für Kardiologie und Kreislauferkrankungen, Eberhard Karls-Universität Tübingen, Tübingen, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Abstract
An expanding body of evidence continues to build on the role of platelets as initial actors in the development of atherosclerotic lesions. Platelets bind to leukocytes and endothelial cells, and initiate monocyte transformation into macrophages. Platelets internalize oxidized phospholipids and promote foam cell formation. Platelets also recruit progenitor cells to the scene that are able to differentiate into foam cells or endothelial cells depending on conditions. Platelets tip the scales in the initiation, development and total extent of atherosclerotic lesions.
Collapse
Affiliation(s)
- S Lindemann
- Medizinische Klinik III, Eberhard Karls-Universität Tübingen, Tübingen, Germany
| | | | | | | |
Collapse
|
43
|
Osmancik PP, Bednar F, Móciková H, Stros P, Jirasek K, Straka Z, Widimsky P. The comparison of platelet activity between patients with patent vs. occluded coronary artery bypass grafts. Thromb Res 2007; 120:523-9. [PMID: 17303221 DOI: 10.1016/j.thromres.2006.12.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2006] [Revised: 11/17/2006] [Accepted: 12/15/2006] [Indexed: 10/23/2022]
Affiliation(s)
- Pavel P Osmancik
- Cardiocenter, Department of Cardiology, 3rd Medical School, Charles University and University Hospital Kralovske Vinohrady Prague, Czech Republic.
| | | | | | | | | | | | | |
Collapse
|
44
|
Osmancik PP, Bednar F, Móciková H. Glycemia, triglycerides and disease severity are best associated with higher platelet activity in patients with stable coronary artery disease. J Thromb Thrombolysis 2007; 24:105-7. [PMID: 17308964 DOI: 10.1007/s11239-006-9038-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2006] [Accepted: 10/19/2006] [Indexed: 10/23/2022]
Abstract
BACKGROUND Inconsistent findings are reported about the relation of platelet activity to disease severity in stable patients with chronic coronary artery disease (CAD). Nevertheless, most reports studied only very small groups of patients. The purpose aim of our study was to assess the relation of platelet activity to disease severity in sufficient number of patients with chronic CAD. METHODS One hundred and sixty stable patients with chronic CAD were studied (25 with single-, 63 with double- and 72 with triple-vessel disease). 91% of them were on aspirin, 1.6% on clopidogrel medication. Platelet activity was determined as membrane expression of antigens CD62P (P-selectin, as % of positive cells) and CD41 (part of GpIIb/IIIa integrin, as mean fluorescence intensity) by flow cytometry. Platelet aggregability was measured by ADP-optical aggregometry. Data sets were compared by Kruskal-Wallis test, correlation by Spearman test. Data are shown as median with 25-75 percentiles. RESULTS Membrane CD62P expression correlated with vessel severity (P < 0.001, Kruskal-Wallis test). Patients with triple-vessel disease had the highest CD62P expression (1.6; 1.1-2.0) followed by patients with double-vessel (1.2; 0.63-1.95) and single-vessel (0.7; 0.30-0.84) disease. Positive correlation was found between CD62P expression with triglycerides (r = 0.49, P < 0.05) and CD41 with fasting glucose (r = 0.48, P < 0.05). No differences in CD41 expression or ADP aggregability were found between groups. CONCLUSION Higher platelet activity is present in patients with more severe CAD. More aggressive anti-platelet treatment in these patients should be considered, especially when metabolic syndrome is simultaneously present.
Collapse
Affiliation(s)
- Pavel P Osmancik
- Cardiocenter, Department of Cardiology, 3rd Medical School, Charles University and FNKV, Srobarova 50, 100 34 Prague, Czech Republic.
| | | | | |
Collapse
|
45
|
Aurigemma C, Fattorossi A, Sestito A, Sgueglia GA, Farnetti S, Buzzonetti A, Infusino F, Landolfi R, Scambia G, Crea F, Lanza GA. Relationship between changes in platelet reactivity and changes in platelet receptor expression induced by physical exercise. Thromb Res 2007; 120:901-9. [PMID: 17337041 DOI: 10.1016/j.thromres.2007.01.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2006] [Revised: 01/09/2007] [Accepted: 01/22/2007] [Indexed: 11/26/2022]
Abstract
INTRODUCTION In previous studies we have consistently shown a significant increase of platelet reactivity after exercise in patients with obstructive coronary artery disease (CAD). We also observed a significant individual variability in the response to exercise of platelet reactivity in these patients. Whether exercise-induced changes in platelet reactivity correlate with changes in platelet membrane receptors in patients with CAD is unknown. METHODS We studied 26 patients with stable CAD and 10 matched healthy controls who underwent a symptom-limited treadmill exercise stress test. Venous blood samples were collected at rest and within 5 min of peak exercise. Platelet reactivity was measured by the PFA-100 method as time to occlude (closure time, CT) a ring coated with collagen/adenosine diphosphate (C/ADP). Platelet expression of glycoprotein (GP) IIb/IIIa, in both global (CD41) and active form (PAC-1), and P-selectin (CD62P) and formation of leukocyte-platelet aggregates were assessed by flow cytometry. RESULTS After exercise CT did not change in controls (85.4+/-12 to 84.0+/-9 s, p=0.37), whereas it decreased in CAD patients (98.8+/-24 to 91.4+/-25 s, p<0.001). After exercise, CD41 and PAC-1 platelet expression increased significantly in CAD patients (p=0.04 for both), but not in controls (p=0.39 and p=0.98, respectively). To evaluate the relationship between the response to exercise of platelet reactivity and of platelet receptor expression, CAD patients were divided into two groups: CAD group 1 (16 patients, decrease in CT >5 s after exercise) and CAD group 2 (10 patients no increase in platelet reactivity after exercise). CD41 and PAC-1 expression increased in CAD group 1 (p=0.008 and p=0.026, respectively) but not in CAD group 2 (p=0.39 and p=0.50, respectively). No significant differences were observed between the 2 groups for changes in CD62P and leukocyte-platelet aggregates. CONCLUSIONS Our data show that, in patients with stable CAD, an increased platelet reactivity to C/ADP stimulation after exercise, as assessed by the PFA-100 method, is specifically associated with an increased expression of platelet GP IIb/IIIa receptor.
Collapse
Affiliation(s)
- Cristina Aurigemma
- Institute of Cardiology, Università Cattolica del Sacro Cuore, Rome, Italy
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Mueller T, Dieplinger B, Poelz W, Calatzis A, Haltmayer M. Utility of whole blood impedance aggregometry for the assessment of clopidogrel action using the novel Multiplate® analyzer—comparison with two flow cytometric methods. Thromb Res 2007; 121:249-58. [PMID: 17482663 DOI: 10.1016/j.thromres.2007.03.022] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2007] [Revised: 03/26/2007] [Accepted: 03/27/2007] [Indexed: 11/15/2022]
Abstract
BACKGROUND Non-responsiveness to anti-platelet therapy has been reported and has been linked to the occurrence of adverse events. No standard method to monitor clopidogrel efficacy is available at present. We aimed at comparing the utility of whole blood impedance aggregometry for the assessment of clopidogrel action using the novel Multiplate analyzer with two flow cytometric methods. METHODS Platelet function was determined before and after the initiation of clopidogrel therapy (300 mg loading dose, followed by 75 mg qd) in 40 patients (observational study). Furthermore, 77 patients and 77 referents with and without clopidogrel treatment (75 mg qd) were evaluated (case control study). Platelet function was assessed by Multiplate ADP and ADP+PG tests, by P-selectin (CD62P) expression, and by vasodilator stimulated phosphoprotein (VASP) phosphorylation status. RESULTS The observational study revealed that platelet reactivity decreased significantly after clopidogrel administration with all 4 methods (p<0.001 for each). In the case control study the median values of all 4 tests were significantly higher in the referents without clopidogrel treatment than in the patients on clopidogrel therapy (p<0.001 for each). Applying test specific lower reference limits as criterion for the differentiation between responders and non-responders to clopidogrel treatment, 57% of the patients on clopidogrel therapy were classified as non-responders with the Multiplate ADP test, 38% with the Multiplate ADP+PG test, 55% with the P-selectin assay, 9% with the PLT VASP/P2Y12 assay. CONCLUSIONS The VASP phosphorylation assay appeared to be advantageous for the assessment of clopidogrel action compared to the Multiplate ADP+PG test, the P-selectin assay, and the Multiplate ADP test (listed in descending order). However, our method comparison study underscores the critical nature of the dependence of results on the techniques used in specific studies, and it remains to be elucidated which method correlates best with the occurrence of adverse events.
Collapse
Affiliation(s)
- Thomas Mueller
- Department of Laboratory Medicine, Konventhospital Barmherzige Brueder, Seilerstaette 2-4, A-4020 Linz, Austria.
| | | | | | | | | |
Collapse
|
47
|
Suzuki KI, Hiramatsu H, Fukushima-Shintani M, Heike T, Nakahata T. Efficient assay for evaluating human thrombopoiesis using NOD/SCID mice transplanted with cord blood CD34+ cells. Eur J Haematol 2006; 78:123-30. [PMID: 17087740 DOI: 10.1111/j.1600-0609.2006.00783.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A suitable model for the preclinical study of human platelet production in vivo has not been available. NOD/SCID mice were characterized as representing an efficient engraftment model for human hematopoietic stem cells, which resulted in the production of human platelets. Here, we evaluated in vivo human thrombopoiesis and ex vivo human platelet functions in NOD/SCID mice transplanted with human cord blood (CB) CD34(+) cells. Human platelets and human CD45(+) cells appeared in peripheral blood of NOD/SCID mice from 4 wk after transplantation. Human platelets produced in these mice showed CD62P expression and the activation of GPIIb/IIIa on human platelets on stimulation with an agonist. PEG-rHuMGDF (0, 0.5 and 5 microg/kg/d s.c.) was injected for 14 d into mice that had been confirmed to produce human platelets stably. The number of human platelets increased about twofold at 0.5 microg/kg/d and about fivefold at 5 microg/kg/d after 14 d. Withdrawal of PEG-rHuMGDF administration caused the human platelet count to return to the pretreatment level. Further, re-administration of PEG-rHuMGDF induced a similar human thrombopoietic response as it did on initial administration. These results suggest that NOD/SCID mice engrafted with human CB CD34(+) cells will be useful for the study of human platelet production in vivo.
Collapse
|
48
|
von Beckerath N, von Beckerath O, Koch W, Eichinger M, Schömig A, Kastrati A. P2Y12 gene H2 haplotype is not associated with increased adenosine diphosphate-induced platelet aggregation after initiation of clopidogrel therapy with a high loading dose. Blood Coagul Fibrinolysis 2005; 16:199-204. [PMID: 15795539 DOI: 10.1097/01.mbc.0000164429.21040.0a] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A large variability in the antiplatelet response to clopidogrel has been consistently reported. Recently, a P2Y12 haplotype was shown to be associated with enhanced adenosine diphosphate (ADP)-induced platelet aggregation in healthy volunteers. The aim of this study was to test in patients (n = 416) scheduled for coronary artery stenting whether P2Y12 haplotype H2 carriage is associated with increased ADP-induced platelet aggregation after administration of a 600 mg loading dose of clopidogrel. Blood was drawn from the arterial sheath at least 2 h after administration of 100 mg aspirin and 600 mg clopidogrel. ADP-induced platelet aggregation was assessed in platelet-rich plasma with light-transmission aggregometry. P2Y12 haplotypes (H1/H2) and P2Y12 C32T genotypes were determined with TaqMan assays. Haplotype combinations and genotypes were not associated with parameters of ADP-induced platelet aggregation after administration of a 600 mg loading dose of clopidogrel. Maximal ADP (5 mumol/l)-induced platelet aggregation was similar in patients carrying haplotype H2 and homozygous carriers of haplotype H1 (43.9 +/- 21.4 versus 43.2 +/- 21.1%, respectively; P = 0.77). Carriage of P2Y12 H2 haplotype does not seem to affect the platelet response to a 600 mg loading dose of clopidogrel in coronary artery disease patients prior to stenting.
Collapse
Affiliation(s)
- Nicolas von Beckerath
- Deutsches Herzzentrum, Technische Universität München, Lazarettstrasse 36, 80636 Munich, Germany.
| | | | | | | | | | | |
Collapse
|
49
|
Fiorella D, Thiabolt L, Albuquerque FC, Deshmukh VR, McDougall CG, Rasmussen PA. Antiplatelet Therapy in Neuroendovascular Therapeutics. Neurosurg Clin N Am 2005; 16:517-40, vi. [PMID: 15990042 DOI: 10.1016/j.nec.2005.03.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Our understanding of the pharmacology of antiplatelet therapy continues to evolve rapidly. Although the existing data are primarily generated in the setting of interventional and preventative cardiology studies, these data may be extrapolated to guide the rational application of these agents in neuroendovascular procedures. Platelet function testing represents an increasingly available and practical method by which to verify the adequacy of therapy and guide clinical decision making. The optimal application of these agents will undoubtedly improve the risk profile of neuroendovascular procedures, increase the success rate of acute stroke intervention, and facilitate more effective secondary stroke prevention.
Collapse
Affiliation(s)
- David Fiorella
- Cleveland Clinic Foundation, 9500 Euclid Avenue, S80, Cleveland, OH 44195, USA.
| | | | | | | | | | | |
Collapse
|
50
|
Claasen B, Axmann M, Meinecke R, Meyer B. Direct observation of ligand binding to membrane proteins in living cells by a saturation transfer double difference (STDD) NMR spectroscopy method shows a significantly higher affinity of integrin alpha(IIb)beta3 in native platelets than in liposomes. J Am Chem Soc 2005; 127:916-9. [PMID: 15656629 DOI: 10.1021/ja044434w] [Citation(s) in RCA: 153] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
About 30% of the proteins in mammalian systems are membrane bound or integrated (e.g., GPCRs). It is inherently difficult to investigate receptor-ligand interactions on a molecular level in their natural membrane environment. Here, we present a new method based on saturation transfer difference (STD) NMR to characterize at an atomic level binding interactions of cell surface proteins in living cells. Implemented as a double difference technique, STD NMR allows the direct observation of binding events and the definition of the binding epitopes of ligands. The binding of the pentapeptide cyclo(RGDfV) to the surface glycoprotein integrin alpha(IIb)beta3 of intact human blood platelets can be detected by saturation transfer double difference (STDD) NMR in less than an hour. A 5-fold higher STD response reflects a significantly higher affinity of integrin alpha(IIb)beta3 in native platelets than in liposomes, which demonstrates the importance of studying membrane proteins in their natural environment. Also, the binding mode of cyclo(RGDfV) in the arginine glycine region is slightly different when interacting with native integrin in platelets compared to integrin reintegrated into liposomes.
Collapse
Affiliation(s)
- Birgit Claasen
- The Institute of Organic Chemistry, Department of Chemistry, University of Hamburg, Martin Luther King Pl. 6, 20146 Hamburg, Germany
| | | | | | | |
Collapse
|