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Liu C, Su Y, Guo W, Ma X, Qiao R. The platelet storage lesion, what are we working for? J Clin Lab Anal 2024; 38:e24994. [PMID: 38069592 PMCID: PMC10829691 DOI: 10.1002/jcla.24994] [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: 04/25/2023] [Revised: 11/04/2023] [Accepted: 11/26/2023] [Indexed: 02/01/2024] Open
Abstract
BACKGROUND Platelet concentrate (PC) transfusions are crucial in prevention and treatment of bleeding in infection, surgery, leukemia, and thrombocytopenia patients. Although the technology for platelet preparation and storage has evolved over the decades, there are still challenges in the demand for platelets in blood banks because the platelet shelf life is limited to 5 days due to bacterial contamination and platelet storage lesions (PSLs) at 20-24°C under constant horizontal agitation. In addition, the relations between some adverse effects of platelet transfusions and PSLs have also been considered. Therefore, understanding the mechanisms of PSLs is conducive to obtaining high quality platelets and facilitating safe and effective platelet transfusions. OBJECTIVE This review summarizes developments in mechanistic research of PSLs and their relationship with clinical practice, providing insights for future research. METHODS Authors conducted a search on PubMed and Web of Science using the professional terms "PSL" and "platelet transfusion." The obtained literature was then roughly categorized based on their research content. Similar studies were grouped into the same sections, and further searches were conducted based on the keywords of each section. RESULTS Different studies have explored PSLs from various perspectives, including changes in platelet morphology, surface molecules, biological response modifiers (BMRs), metabolism, and proteins and RNA, in an attempt to monitor PSLs and identify intervention targets that could alleviate PSLs. Moreover, novel platelet storage conditions, including platelet additive solutions (PAS) and reconsidered cold storage methods, are explored. There are two approaches to obtaining high-quality platelets. One approach simulates the in vivo environment to maintain platelet activity, while the other keeps platelets at a low activity level in vitro under low temperatures. CONCLUSION Understanding PSLs helps us identify good intervention targets and assess the therapeutic effects of different PSLs stages for different patients.
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Affiliation(s)
- Cheng Liu
- Peking University Third HospitalBeijingChina
| | - Yang Su
- Peking University Third HospitalBeijingChina
| | - Wanwan Guo
- Peking University Third HospitalBeijingChina
| | - Xiaolong Ma
- Peking University Third HospitalBeijingChina
| | - Rui Qiao
- Peking University Third HospitalBeijingChina
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Nellis ME, Spinella PC, Tucci M, Stanworth SJ, Steiner ME, Cushing MM, Davis PJ, Karam O. Effect of platelet storage duration on clinical outcomes and incremental platelet change in critically ill children. Transfusion 2020; 60:2849-2858. [PMID: 32959409 DOI: 10.1111/trf.16094] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 06/10/2020] [Accepted: 07/27/2020] [Indexed: 12/15/2022]
Abstract
The safety of platelet (PLT) concentrates with longer storage duration has been questioned due to biochemical and functional changes that occur during blood collection and storage. Some studies have suggested that transfusion efficacy is decreased and immune system dysfunction is worsened with increased storage age. We sought to describe the effect of PLT storage age on laboratory and clinical outcomes in critically ill children receiving PLT transfusions. STUDY DESIGN AND METHODS We performed a secondary analysis of a prospective, observational point-prevalence study. Children (3 days to 16 years of age) from 82 pediatric intensive care units in 16 countries were enrolled if they received a PLT transfusion during one of the predefined screening weeks. Outcomes (including PLT count increments, organ dysfunction, and transfusion reactions) were evaluated by PLT storage age. RESULTS Data from 497 patients were analyzed. The age of the PLT transfusions ranged from 1 to 7 days but the majority were 4 (24%) or 5 (36%) days of age. Nearly two-thirds of PLT concentrates were transfused to prevent bleeding. The indication for transfusion did not differ between storage age groups (P = .610). After patient and product variables were adjusted for, there was no association between storage age and incremental change in total PLT count or organ dysfunction scoring. A significant association between fresher storage age and febrile transfusion reactions (P = .002) was observed. CONCLUSION The results in a large, diverse cohort of critically ill children raise questions about the impact of storage age on transfusion and clinical outcomes which require further prospective evaluation.
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Affiliation(s)
- Marianne E Nellis
- Pediatric Critical Care Medicine, NY Presbyterian Hospital-Weill Cornell Medicine, New York, New York
| | - Philip C Spinella
- Department of Pediatrics, Division of Critical Care, Washington University in St Louis, St Louis, Missouri
| | - Marisa Tucci
- Pediatric Intensive Care Unit, CHU Sainte-Justine, University of Montreal, Montreal, Quebec, Canada
| | - Simon J Stanworth
- Transfusion Medicine, NHS Blood and Transplant, Oxford, UK.,Department of Haematology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK.,Radcliffe Department of Medicine, University of Oxford and Oxford BRC Haematology Theme, Oxford, UK
| | - Marie E Steiner
- Divisions of Pediatric Critical Care and Pediatric Hematology/Oncology, University of Minnesota, Minneapolis, Minnesota
| | | | - Peter J Davis
- Paediatric Intensive Care Unit, Bristol Royal Hospital for Children, Bristol, UK
| | - Oliver Karam
- Division of Pediatric Critical Care Medicine, Children's Hospital of Richmond at VCU, Richmond, Virginia
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Marks DC, Johnson L. Assays for phenotypic and functional characterization of cryopreserved platelets. Platelets 2018; 30:48-55. [DOI: 10.1080/09537104.2018.1514108] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Denese C Marks
- Research and Development, Australian Red Cross Blood Service, Sydney, NSW, Australia
- Sydney Medical School, the University of Sydney, Sydney, NSW, Australia
| | - Lacey Johnson
- Research and Development, Australian Red Cross Blood Service, Sydney, NSW, Australia
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Ng MSY, Tung JP, Fraser JF. Platelet Storage Lesions: What More Do We Know Now? Transfus Med Rev 2018; 32:S0887-7963(17)30189-X. [PMID: 29751949 DOI: 10.1016/j.tmrv.2018.04.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 04/09/2018] [Accepted: 04/09/2018] [Indexed: 12/20/2022]
Abstract
Platelet concentrate (PC) transfusions are a lifesaving adjunct to control and prevent bleeding in cancer, hematologic, surgical, and trauma patients. Platelet concentrate availability and safety are limited by the development of platelet storage lesions (PSLs) and risk of bacterial contamination. Platelet storage lesions are a series of biochemical, structural, and functional changes that occur from blood collection to transfusion. Understanding of PSLs is key for devising interventions that prolong PC shelf life to improve PC access and wastage. This article will review advancements in clinical and mechanistic PSL research. In brief, exposure to artificial surfaces and high centrifugation forces during PC preparation initiate PSLs by causing platelet activation, fragmentation, and biochemical release. During room temperature storage, enhanced glycolysis and reduced mitochondrial function lead to glucose depletion, lactate accumulation, and product acidification. Impaired adenosine triphosphate generation reduces platelet capacity to perform energetically demanding processes such as hypotonic stress responses and activation/aggregation. Storage-induced alterations in platelet surface proteins such as thrombin receptors and glycoproteins decrease platelet aggregation. During storage, there is an accumulation of immunoactive proteins such as leukocyte-derive cytokines (tumor necrosis factor α, interleukin (IL) 1α, IL-6, IL-8) and soluble CD40 ligand which can participate in transfusion-related acute lung injury and nonhemolytic transfusion reactions. Storage-induced microparticles have been linked to enhanced platelet aggregation and immune system modulation. Clinically, stored PCs have been correlated with reduced corrected count increment, posttransfusion platelet recovery, and survival across multiple meta-analyses. Fresh PC transfusions have been associated with superior platelet function in vivo; however, these differences were abrogated after a period of circulation. There is currently insufficient evidence to discern the effect of PSLs on transfusion safety. Various bag and storage media changes have been proposed to reduce glycolysis and platelet activation during room temperature storage. Moreover, cryopreservation and cold storage have been proposed as potential methods to prolong PC shelf life by reducing platelet metabolism and bacterial proliferation. However, further work is required to elucidate and manage the PSLs specific to these storage protocols before its implementation in blood banks.
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Affiliation(s)
- Monica Suet Ying Ng
- Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia; Faculty of Medicine, University of Queensland, Herston, Queensland, Australia; Research and Development, Australian Red Cross Blood Service, Kelvin Grove, Queensland, Australia.
| | - John-Paul Tung
- Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia; Faculty of Medicine, University of Queensland, Herston, Queensland, Australia; Research and Development, Australian Red Cross Blood Service, Kelvin Grove, Queensland, Australia.
| | - John Francis Fraser
- Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia; Faculty of Medicine, University of Queensland, Herston, Queensland, Australia.
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Meledeo MA, Herzig MC, Bynum JA, Wu X, Ramasubramanian AK, Darlington DN, Reddoch KM, Cap AP. Acute traumatic coagulopathy. J Trauma Acute Care Surg 2017; 82:S33-S40. [DOI: 10.1097/ta.0000000000001431] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Abe H, Shiba M, Niibe Y, Tadokoro K, Satake M. Pulsed xenon flash treatment inactivates bacteria in apheresis platelet concentrates while preserving in vitro quality and functionality. Transfusion 2017; 57:989-996. [DOI: 10.1111/trf.13984] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 11/21/2016] [Accepted: 11/21/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Hideki Abe
- Central Blood Institute, Blood Service Headquarters, Japanese Red Cross Society
| | - Masayuki Shiba
- Central Blood Institute, Blood Service Headquarters, Japanese Red Cross Society
| | | | - Kenji Tadokoro
- Central Blood Institute, Blood Service Headquarters, Japanese Red Cross Society
| | - Masahiro Satake
- Central Blood Institute, Blood Service Headquarters, Japanese Red Cross Society
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Agkihpin, a novel SVTLE from Gloydius halys Pallas, promotes platelet aggregation in vitro and inhibits thrombus formation in vivo in murine models of thrombosis. Toxicon 2016; 122:78-88. [DOI: 10.1016/j.toxicon.2016.09.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 09/18/2016] [Accepted: 09/21/2016] [Indexed: 12/17/2022]
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Expression and function of purinergic receptors in platelets from apheresis-derived platelet concentrates. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2015; 14:545-551. [PMID: 26674810 DOI: 10.2450/2015.0073-15] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 07/17/2015] [Indexed: 01/11/2023]
Abstract
BACKGROUND The storage of platelets affects platelet integrity and functionality, a process named platelet storage lesion (PSL). Reduced adenosine diphosphate (ADP)-induced platelet aggregation is a typical manifestation of PSL. However, the role of ADP receptors in this context has not been evaluated yet. The aim of this study was, therefore, to investigate surface expression and function of the purinergic receptors P2Y1, P2Y12 and P2X1 in stored platelet concentrates. MATERIAL AND METHODS Platelets were obtained from venous whole blood and from apheresis-derived platelet concentrates stored for 0, 2 and 5 days. Purinergic receptor expression was measured by flow cytometry and western blot analysis. Receptor function was determined by calcium-induced fluorescence (P2Y1 and P2X1) or by flow cytometric measurement of the platelet reactivity index (P2Y12). RESULTS The basal surface expression and total content of purinergic receptors remained unchanged throughout storage. After an initial reduction during apheresis, P2X1-mediated calcium flux was maintained, whereas the P2Y1-mediated increase of calcium flux gradually decreased during the course of storage. In contrast, the platelet reactivity index was comparable in freshly obtained and stored platelets. DISCUSSION The function of the P2Y12 receptor is maintained during storage of apheresis-derived platelet concentrates. However, the impairment of P2X1 and especially of P2Y1 receptor function indicated by decreased receptor-mediated calcium flux is an important mechanism contributing to reduced ADP responsiveness of stored platelets.
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Abstract
INTRODUCTION Platelet refrigeration decreases the risk of bacterial contamination and may preserve function better than standard-of-care room temperature (RT) storage. Benefits could include lower transfusion-related complications, decreased costs, improved hemostasis in acutely bleeding patients, and extended shelf life. In this study, we compared the effects of 22°C and 4°C storage on the functional and activation status of apheresis platelets. METHODS Apheresis platelets (n = 5 per group) were stored for 5 days at 22°C with agitation (RT) versus at 4°C with agitation (4°C + AG) and without (4°C). Measurements included platelet counts, mean platelet volume, blood gas analytes, aggregation response, thromboelastography, thromboxane B2 and soluble CD40 ligand release, activation markers, and microparticle formation. RESULTS Sample pH levels were within acceptable limits for storage products (pH 6.2-7.4). Platelet glucose metabolism (P < 0.05), aggregation response (adenosine diphosphate: RT 0; 4°C + AG 5.0 ± 0.8; 4°C 5.6 ± 0.9; P < 0.05), and clot strength (maximum amplitude: RT 58 ± 2; 4°C + AG 63 ± 2; 4°C 67 ± 2; P < 0.05) were better preserved at 4°C compared with RT storage. Refrigerated samples were more activated compared with RT (P < 0.05), although thromboxane B2 (P < 0.05) and soluble CD40 ligand release (P < 0.05) were higher at RT. Agitation did not improve the quality of 4°C-stored samples. CONCLUSIONS Apheresis platelets stored at 4°C maintain more viable metabolic characteristics, are hemostatically more effective, and release fewer proinflammatory mediators than apheresis platelets stored at RT over 5 days. Given the superior bacteriologic safety of refrigerated products, these data suggest that cold-stored platelets may improve outcomes for acutely bleeding patients.
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Schlagenhauf A, Haidl H, Leschnik B, Leis HJ, Heinemann A, Muntean W. Prostaglandin E2 levels and platelet function are different in cord blood compared to adults. Thromb Haemost 2014; 113:97-106. [PMID: 25118631 DOI: 10.1160/th14-03-0218] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 07/01/2014] [Indexed: 11/05/2022]
Abstract
Neonatal platelets support primary haemostasis and thrombin generation as well as adult platelets, despite observable hypoaggregability in vitro. High prostaglandin E2 levels at accouchement could account for inhibited platelet function via the EP4 receptor. We set out to determine prostaglandin E2 plasma levels in cord blood of healthy neonates and evaluate the impact of prostaglandin E2 on platelet function in adult and cord blood samples. Prostaglandin E2 plasma levels were measured in cord blood and venous adult blood using GC-MS. Impact of prostaglandin E2 on platelet aggregation was measured by spiking cord blood and adult samples. Contributions of EP3 and EP4 receptors were evaluated using respective antagonists. Intracellular cAMP concentrations were measured using a commercial ELISA-kit. Prostaglandin E2 plasma levels were substantially higher in cord blood than in adult samples. Spiking with prostaglandin E2 resulted in a slight but consistent reduction of platelet aggregation in adult blood, but response to PGE2 was blunted in cord blood samples. Aggregation response of spiked adult samples was still higher than with non-spiked cord blood samples. Blockage of EP4 receptors resulted in improved platelet aggregation in adult platelets upon prostaglandin E2 spiking, while aggregation in cord blood samples remained unaltered. Intracellular cAMP concentrations after preincubation with prostaglandin E2 were only increased in adult samples. In conclusion, very high prostaglandin E2 concentrations in cord blood affect platelet function. This effect may partially explain neonatal platelet hypoaggregability. Peak levels of prostaglandin E2 can potentially protect against birth stress-induced platelet activation.
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Affiliation(s)
- Axel Schlagenhauf
- Axel Schlagenhauf, PhD, Department of General Pediatrics and Adolescent Medicine, Medical University of Graz, Auenbruggerplatz 34/II, A-8036 Graz, Austria, Tel.: +43 316 385 14031, Fax: +43 316 385 13264, E-mail:
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Kobsar A, Klinker E, Kuhn S, Koessler A, Yilmaz P, Boeck M, Koessler J. Increasing susceptibility of nitric oxide-mediated inhibitory platelet signaling during storage of apheresis-derived platelet concentrates. Transfusion 2014; 54:1782-9. [DOI: 10.1111/trf.12584] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/31/2013] [Accepted: 11/13/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Anna Kobsar
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
| | - Erdwine Klinker
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
| | - Sabine Kuhn
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
| | - Angela Koessler
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
| | - Pinar Yilmaz
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
| | - Markus Boeck
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
| | - Juergen Koessler
- Institute of Transfusion Medicine and Haemotherapy; University of Wuerzburg; Wuerzburg Germany
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Comparison of in vitro responses to fresh whole blood and reconstituted whole blood after collagen stimulation. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2013; 12:50-5. [PMID: 24333065 DOI: 10.2450/2013.0303-12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 06/10/2013] [Indexed: 11/21/2022]
Abstract
BACKGROUND In patients who have large bleeds, there is a tendency to transfuse more plasma and platelets than recommended in earlier guidelines, and accordingly many hospitals now provide "transfusion packages" with an intended red cell:platelet:plasma ratio of 1:1:1. The purpose of this study was to investigate in vitro functions of transfusion packs compared with fresh whole blood. MATERIAL AND METHODS "Reconstituted whole blood" was prepared with the same ratio of red cells, platelets and plasma as used in local transfusion packages. The aggregation and thrombin-antithrombin complex formation responses to collagen stimulation of this reconstituted whole blood were compared with those of fresh whole blood. The storage time of red cells and platelets was varied in a systematic manner, giving nine different compositions of reconstituted whole blood that simulated transfusion packs. RESULTS The responses varied significantly between whole blood and reconstituted whole blood -and between the reconstituted whole blood of different compositions. A significant decrease (p<0.005) in collagen-induced platelet count reduction was seen with increasing platelet and red blood cell age. Thrombin-antithrombin complex formation peaked in studies with platelets stored for 5 days. The red cells stored for the longest time induced the greatest thrombin-antithrombin complex formation. Fresh whole blood gives more consistent responses, and the aggregation response to collagen is stronger than in reconstituted whole blood. DISCUSSION Our results indicate that in vitro responses of reconstituted whole blood vary substantially according to how long the red cells and platelets are stored for. As the responses obtained by testing whole blood are more consistent and usually stronger, the alternative use fresh whole blood in special conditions should not be excluded without further consideration.
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Barinov E, Sulaieva O, Lyakch Y, Guryanov V, Kondratenko P, Radenko Y. Platelet aggregation measurement for assessment of hemostasis failure mechanisms in patients with gastroduodenal ulcer bleeding. Clin Exp Gastroenterol 2013; 6:139-48. [PMID: 23950655 PMCID: PMC3742342 DOI: 10.2147/ceg.s45685] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Background The purpose of this study was to identify factors associated with the risk of unsustainable hemostasis in patients with gastric and duodenal ulcer bleeding by in vitro assessment of platelet reactivity using artificial neural networks. Methods Patients with gastroduodenal ulcers complicated by bleeding were studied. Platelet aggregation was measured using aggregometry with adenosine diphosphate 5 μM, epinephrine 2.5 μM, 5-hydroxytryptophan 10 μM, collagen 1 μM, and thrombin 0.06 NIH Unit/mL as agonists. Multiple logistic regression was used to evaluate the independent relationship between demographic, clinical, endoscopic, and laboratory data and in vitro assessment of platelet reactivity and local parameters of hemostasis in patients with ulcer bleeding. Results Analysis of platelet aggregation in patients with gastroduodenal ulcer bleeding allowed the variability of platelet response to different agonists used in effective concentration which induces 50% platelet aggregation (EC50) to be established. The relationship between platelet aggregation and the spatial-temporal characteristics of ulcers complicated by bleeding was demonstrated. Adrenoreactivity of platelets was associated with time elapsed since the start of ulcer bleeding and degree of hemorrhage. The lowest platelet response to collagen and thrombin was detected in patients with active bleeding (P < 0.001) and unsustainable recent bleeding (P < 0.01). Decreased adenosine diphosphate-induced platelet aggregation in patients with ulcer bleeding was correlated with the platelet response to thrombin (r = 0.714, P < 0.001) and collagen (r = 0.584, P < 0.01). Conclusion Estimation of platelet reactivity in vitro indicates the key mechanisms of failure of hemostasis in patients with ulcer bleeding. In addition to gender, an important determinant of unsustainable hemostasis was a decreased platelet response to thrombin and adenosine diphosphate.
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Affiliation(s)
- Edward Barinov
- Department of Histology, Cytology, and Embryology, Donetsk, Ukraine
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Kobsar A, Putz E, Yilmaz P, Weinig E, Boeck M, Koessler J. Decreasing phosphodiesterase 5A activity contributes to platelet cGMP accumulation during storage of apheresis-derived platelet concentrates. Transfusion 2013; 54:1008-14. [PMID: 23909451 DOI: 10.1111/trf.12360] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 06/12/2013] [Accepted: 06/12/2013] [Indexed: 12/26/2022]
Abstract
BACKGROUND Platelet storage lesion (PSL) considerably decreases the quality of platelets (PLTs) in concentrates characterized by a loss of signaling responses to agonists and impaired PLT activation, secretion, and aggregation. To understand the role of inhibitory signaling pathways in the mechanism of PSL, the basal state of the cyclic nucleotide (CN)-dependent signaling systems in stored PLTs was investigated. STUDY DESIGN AND METHODS Whole blood samples (WB) and apheresis-derived PLT concentrates (APCs) were obtained from healthy volunteers. Washed PLTs were prepared from WB on Day 0 and from APCs on Days 0, 2, and 5. The basal phosphorylation of the vasodilator-stimulated phosphoprotein (VASP) and phosphodiesterase 5A (PDE5A) levels were quantified by Western blot. CN and PDE5A activity were measured by enzyme-linked immunoassay kits. Fibrinogen binding and aggregation were measured in PLT-rich plasma of WB or APC samples. Unpaired t test was used for statistical analysis. RESULTS Basal VASP phosphorylation levels were comparable in WB and APCs on Day 0. VASP phosphorylation increased significantly during storage of APCs, more pronounced at Ser(239) than at Ser(157) . Similarly, intracellular cGMP, but not cAMP, concentration continuously increased in stored PLTs, whereas PDE5A levels and activity significantly decreased accompanied by diminished thrombin receptor activator peptide 6-induced fibrinogen binding and aggregation. CONCLUSION Storage of APCs leads to intracellular cGMP accumulation that could be caused by degradation of PDE5A. Enhanced cGMP level supports subsequent cGMP-dependent protein kinase-mediated increase of VASP phosphorylation resulting in reduced fibrinogen binding and aggregation.
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Affiliation(s)
- Anna Kobsar
- Institute of Transfusion Medicine and Haemotherapy, University of Wuerzburg, Wuerzburg, Germany
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