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Reference Curves for Aggregation and ATP Secretion to Aid Diagnose of Platelet-Based Bleeding Disorders: Effect of Inhibition of ADP and Thromboxane A2 Pathways

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Reference Curves for Aggregation and ATP Secretion to Aid Diagnose of Platelet-Based Bleeding Disorders: Effect of Inhibition of ADP and Thromboxane A2 Pathways Platelets, August 2007; 18(5): 329–345 ORIGINAL ARTICLE Reference curves for aggregation and ATP secretion to aid diagnose of platelet-based bleeding disorders: Effect of inhibition of ADP and thromboxane A2 pathways BAN B. DAWOOD1, JONATHAN WILDE2, & STEVE P. WATSON1 1Centre for Cardiovascular Sciences, Division of Medical Sciences, Institute of Biomedical Research, Wolfson Drive, The Medical School, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK and 2Adult Haemophilia Centre, Queen Elizabeth Hospital, Birmingham B15 2TH, UK (Received 15 September 2006; accepted 18 September 2006) Abstract Platelet aggregation is widely used in clinical laboratories to evaluate patients with bleeding disorders of suspected platelet aetiology. Simultaneous monitoring of ATP release as a measure of dense granule secretion provides additional information to aid diagnosis. There is, however, no standard way of performing or interpreting these tests. The present study has evaluated aggregation and ATP secretion to eight platelet agonists in healthy donors and has evaluated the reproducibility of response for a number of variables, including platelet number and time after donation. The effect of inhibition of the two major platelet feedback mediators, ADP and thromboxane A2 (TxA2), was investigated using the P2Y1 and P2Y12 receptor antagonists, MRS2179 and AR-C67085, and the cyclooxygenase inhibitor, indomethacin. The results demonstrate that, if used within certain boundaries, the investigation of platelet aggregation and secretion is a powerful way to discriminate between differing pathways of platelet activation. The present data-set are an invaluable resource to the clinical laboratory to aid evaluation of patients with suspected platelet-based bleeding disorders. For personal use only. Keywords: Patient testing, platelets aggregation, dense granule secretion, ADP receptors, thromboxane A2 Introduction and concentrations. Indeed, platelet aggregation methodology remained largely unchanged since the Platelets are critical elements in the maintenance of late 1980s despite important advances in our under- normal haemostasis. Abnormalities in platelet standing of platelet activation. For example, the Platelets Downloaded from informahealthcare.com by University of Birmingham on 09/20/12 number or platelet function may result in excessive guidelines in the UK for investigation of patients with bleeding. Platelet function testing is routinely used in suspected platelet-based bleeding disorders, includ- the clinic to diagnose patients with suspected ing information on platelet aggregation studies, were platelet-based bleeding disorders. One of the most drawn up by British Society for Haematology Task widely used tests for assessing platelet reactivity is Force in 1988 [3]. A more recent report on behalf of platelet aggregation in platelet-rich plasma (PRP). the Rare Haemostatic Disorders Working Party of However, there is no accepted way to perform or the UK Haemophilia Centre Doctors Organisation interpret these studies [1], with practices varying (UKHCDO) summarizes heritable platelet disorders between laboratories as recently documented by a and gives guidelines on their analysis and clinical review of 46 North American Clinical Laboratories management [4]. This report emphasizes the impor- [2]. Variables include factors such as sample collec- tance of aggregation testing in clinical diagnosis but tion, platelet preparation, platelet number, agonist does not give experimental details on how to perform selection and agonist concentrations. Furthermore, these studies. Further, development of expertise in the full value of aggregometry is seldom achieved platelet function testing is hampered by the small because of the use of a limited number of agonists number of clinical patients who require testing and Correspondence: Steve P. Watson, Centre for Cardiovascular Sciences, Division of Medical Sciences, Institute of Biomedical Research, Wolfson Drive, The Medical School, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. E-mail: [email protected] ISSN 0953–7104 print/ISSN 1369–1635 online ß 2007 Informa UK Ltd. DOI: 10.1080/09537100601024111 330 B. B. Dawood et al. by the even smaller number of patients with defined, these agonists has also been evaluated. The results platelet-based disorders. provide a valuable resource of data to aid patient The interpretation of aggregation concentration testing and suggest that, if used within certain response curves in patients is highly specialized boundaries, the simultaneous investigation of platelet because of the complexity of interacting mechanisms aggregation and ATP secretion is a powerful that coordinate the aggregation response. For exam- way to aid diagnosis of patients with suspected ple, a defect in response to more than one platelet platelet-based bleeding disorders. agonist could be due to a generalized defect in platelet activation, to impairment in release of the Materials and methods major feedback mediators, ADP and TxA2,ortoa defect in the P2Y12 receptor for ADP or in the Materials thromboxane receptor. For example, a defect in the Trisodium citrate, ADP, adrenaline, U46619, ara- P2Y12 ADP receptor would result in abnormal responses to low concentrations of nearly all platelet chidonic acid, indomethacin and MRS2179 were agonists, including arachidonic acid, which is purchased from Sigma (Poole, UK). Horm collagen frequently used to investigate possible defects in was purchased from Nycomed Austria (Linz, cyclooxygenase activity. On the other hand, a defect Austria). The PAR1 peptide SFLLRN was purchased from Alta Bioscience Laboratory (University of in the P2Y1 ADP receptor would have a more selective effect because it generates a relatively weak Birmingham, UK). The PAR4 peptide AYPGKF signal and its activation is masked by receptors which and CRP was purchased from Dr Richard Farndale signal through the same pathway, such as the (Cambridge University, UK). AR-C67085 was a gift thromboxane receptor and the two thrombin recep- from Astrazeneca (Loughborough, UK). Luciferin Luciferase reagent (Chrono-lume) was purchased tors, PAR1 and PAR4 [5]. The interpretation of aggregation traces is also influenced by the natural from Chrono-log Corporation (Havertown, PA, variation in responses that exist within the popula- USA). Platelet aggregation and secretion was tion, thereby making it essential for each laboratory performed on a Dual Channel Lumi-Aggregometer to have standard reference curves for comparison to (model 460VS, Chronolog). ADP (10 mM), adrena- patients’ responses. For example, a recent study on line (100 mM), PAR1-peptide (10 mM), PAR4-pep- aggregation responses in 359 healthy individuals tide (500 mM), MRS2179 (10 mM) and AR-C67085 identified a subset of donors with hyperresponsive (10 mM) were dissolved in phosphate-buffered saline platelets which was maintained over independent (PBS) and stored as frozen aliquots at the concen- trations shown and diluted in PBS on the day of the For personal use only. experiments [6]. Several laboratories have published their own experiment. CRP (1.4 mg/ml stock) was stored at methods for monitoring platelet aggregation [1], 4C and diluted in 0.01 M acetic acid in PBS but none has used a full range of platelet agonists and containing 0.1% fattyacid-free bovine serum albumin evaluated responses in the presence of inhibitors of on the day of the experiment. Collagen was stored as the two major feedback inhibitors, ADP and TxA2. a concentrated stock at 1mg/ml as supplied by the Further, few laboratories have extended their analysis manufacturer at 4C. Arachidonic acid (1 M) and to the simultaneous monitoring of ATP secretion indomethacin (10 mM) were stored and diluted in from dense granules, despite the availability of dimethyl sulphoxide (DMSO). U46619 (1 mM) was lumi-aggregometers for more than 25 years and stored in DMSO and diluted in PBS on the day of Platelets Downloaded from informahealthcare.com by University of Birmingham on 09/20/12 recognition of the value in monitoring ATP secretion the experiments. Agents were added in dilutions in diagnosis [7]. of 1: 100, with the exception of arachidonic acid and The aim of the present study was to investigate indomethacin which were added at a dilution of aggregation and dense granule secretion to low, 1: 300 to keep the DMSO concentration to 0.33%. intermediate and high concentrations of a range of platelet agonists and to investigate the extent to Preparation of platelet rich plasma which these responses vary between healthy donors and factors such as time after donation and platelet All donors gave informed consent and answered number. Importantly, several of the agonists are not negatively to routine deferral questions such as routinely used in clinical testing, even though their ingestion of aspirin and other agents that may inclusion would aid diagnosis of what are anticipated influence platelet function. Whole blood was antic- to be among the more common causes of mild oagulated with 4% trisodium citrate (trisodium platelet-based disorders. These include the throm- citrate/whole blood ratio, 1:9), unless stated, by boxane analogue, U46619, PAR1 and PAR4 throm- collecting 50 ml blood using a 21 G needle into a bin receptor-specific peptides, and the GPVI plastic polypropylene syringe containing anticoagu- collagen receptor agonist, collagen-related peptide lant. The blood was transferred to 5 ml polypropy- (CRP). The effect of inhibition of the major platelet
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