1 FINAL PROGRAMME Joint British Society for Haemostasis & Thrombosis & UK Platelet Group Annual Scientific and general meeting Assembly Rooms, Bath 18th-19th October 2012 THURSDAY 18th October 09.00 Registration opens & Coffee 10:00 – 12:10 SESSION 1 – Chairpersons – Paul Harrison & Steve Watson 10.00 – 10.40 NOVEL PHOSPHOLIPIDS AND PLATELET PROCOAGULANT ACTIVITY Dr. Peter Collins, University Hospital of Wales, Cardiff, UK 10.40 – 10.55 O1 TRANSIENT RECEPTOR POTENTIAL CHANNELS (TRPCs) CONTRIBUTE TO PLATELET PHOSPHATIDYLSERINE EXPOSURE Matthew T. Harper, Juan E. C. Londoño, Kathryn Quick, Lutz Birnbaumer, Marc Friechel, Alastair W. Poole. School of Physiology and Pharmacology, University of Bristol, Bristol. Department of Experimental and Clinical Pharmacology and Toxicology, Faculty of Medicine, Saarland University, Homburg, Germany. Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, London. 10.55 – 11.10 O2 MEGAKARYOCYTE-SPECIFIC DELETION OF THE PROTEIN-TYROSINE PHOSPHATASES SHP1 AND SHP2 CAUSES A BLOCK IN MEGAKARYOCYTE DEVELOPMENT AND SEVERE MACROTHROMBOCYTOPENIA Alexandra Mazharian, Jun Mori, Ying-Jie Wang, Silke Heising, Benjamin G. Neel, Steve P. Watson and Yotis A. Senis. Centre for Cardiovascular Sciences, School of Clinical and Experimental Medicine, Institute of Biomedical Research, University of Birmingham, Birmingham, UK. Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford, UK. Campbell Family Cancer Research Institute, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network and Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada 2 11.10 – 11.25 O3 P2Y12 CONTROLS A MUNC13-4-INDEPENDENT PATHWAY TO PLATELET SECRETION OF α-GRANULES BUT NOT DENSE GRANULES Matthew T. Harper, Joshua S. Savage, Christopher M. Williams & Alastair W. Poole School of Physiology and Pharmacology, Medical Sciences Building, University of Bristol, Bristol, BS8 1TD, UK. 11.25 – 11.40 O4 A NOVEL MUTATION IN THE DRY MOTIF OF THE P2Y12 RECEPTOR RESULTS IN CHRONIC BLEEDING IN A PATIENT Stuart Mundell, Kathryn Garner, Shaista Nisar, Steve Watson, Yatin Patel, Steve Austin on behalf of the UK GAPP Study Group School of Physiology and Pharmacology. University of Bristol, University Walk, Bristol, BS8 1TD, UK, School of Clinical and Experimental Medicine Institute of Biomedical Research, University of Birmingham, Birmingham B15 2TT, UK, Kings College London, Rayne Institute, St. Thomas' Hospital, London, UK, 4Centre for Haemostasis and Thrombosis, St. Thomas' Hospital, London, UK 11.40 – 11.55 O5 PROCOAGULANT MICROPARTICLES DURING CHEMOTHERAPY FOR NON-HODGKIN LYMPHOMA Sunna Asghar, Henry Watson, Paraskevi Untiveros, Dominic Culligan, and Isobel Ford. Cardiovascular Research Programme, School of Medicine & Dentistry, University of Aberdeen and Department of Haematology, Aberdeen Royal Infirmary, Aberdeen, Scotland. 11.55 – 12.10 O6 CHARACTERISATION OF THE PROCOAGULANT PROPERTIES OF MICROPARTICLES DERIVED FROM DIFFERENT CELL TYPES Mohammed A Alsahli, Hassan S Hamali, Alison H Goodall. Department of Cardiovascular Sciences, University of Leicester, UK, and College of Applied Medical Sciences, King Khalid University, Abha, Kingdom of Saudi Arabia 12.10 – 12.40 BSHT AGM – BSHT members only 12.40 – 14.00 LUNCH, EXHIBITION & coffee/tea & poster viewing 14.00 – 15.40 SESSION 2 – Chairpersons – Nicola Mutch and Robert Ariens 14.00 – 14.40 PLATELET POLYPHOSPHATE AND THE CONTACT SYSTEM Professor Jim Morrissey, Department of Biochemistry, College of Medicine, University of Illinois, USA 14.40 –14.55 O7 IMMOBILIZED TRANSITION METALS STIMULATE ACTIVATION OF THE CONTACT PATHWAY Nicola J Mutch, Emily K Waters, Jim H Morrissey. Institute of Medical Sciences, University of Aberdeen, UK; Department of Biochemistry, University of Illinois, Urbana, IL, USA 14.55 – 15.10 O8 FLUORESCENT CONFOCAL MICROSCOPY AS A TOOL TO TRACK AND INVESTIGATE FIBRINOLYSIS Claire Whyte, and Nicola Mutch, Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK 15.10 – 15.25 O9 IDENTIFICATION OF NOVEL VARIATIONS IN PLATELET GPCRS IN PATIENTS HISTORICALLY DIAGNOSED WITH TYPE 1 VON WILLEBRAND DISEASE IN THE EUROPEAN MCMDM-1VWD STUDY J. Stockley, A. Goodeve, S. Nisar, A.D. Mumford, S.J. Mundell, S.P. Watson and M.E. Daly on behalf of the UK GAPP Study Group and in collaboration with the EU MCMDM-1VWD study group. Department of Cardiovascular Science, University of Sheffield, Sheffield, S10 2RX; 3 School of Physiology and Pharmacology, University of Bristol, Bristol, BS8 1TD; Bristol Heart Institute & School of Cellular and Molecular Medicine, University of Bristol, Bristol, BS2 8HW; Centre for Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, B15 2TT 15.25 –15.40 O10 THE TOLL-LIKE RECEPTOR 2 LIGAND PAM3CSK4 INDUCES PLATELET ACTIVATION VIA THE SRC/SYK/LAT/PLC2 SIGNALLING PATHWAY. Knut Fälker & Magnus Grenegård. Linköping University, Faculty of Health Sciences, Department of Medicine and Health, Division of Drug Research/Pharmacology, and Department of Clinical and Experimental Medicine, Division of Clinical Chemistry, 58185 Linköping, Sweden 15.40 – 16.10 Coffee Break and EXHIBITION 16.10 – 17.35 SESSION 3 Chairpersons Alison Goodall & Jon Gibbins 16.10 – 16.50 NEW ADVANCES IN ANTIPLATELET AGENTS Dr. Azfar Zaman. Freeman Hospital, Newcastle UK 16.50 – 17.05 O11 WOULD A NEW FOCUS ON VASCULAR PROSTAGLANDINS IMPROVE ANTIPLATELET TREATMENT REGIMES? Stan Heptinstall, David Iyú, Jacqueline R. Glenn, Ann E. White, Sue Fox. Cardiovascular Medicine, University of Nottingham, Nottingham, UK 17.05 – 17.20 O12 A SUBPOPULATION OF UNINHIBITED PLATELETS CAN PROVIDE THE FOCUS FOR PLATELET AGGREGATE FORMATION Thomas Hoefer, & Timothy D. Warner, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London 17.20 – 17.35 O13 CROSS REGULATION OF THROMBOXANE A2 (TP) AND P2Y RECEPTORS IN HUMAN PLATELETS M.I. Butler, R.J. P. Pope, D.A. Marsden, J.F. Barton, A. D. Mumford, A. W. Poole, T. W. Johnson, and S.J. Mundell. School of Physiology and Pharmacology, University of Bristol, Bristol, United Kingdom, Bristol Heart Institute, University of Bristol, Bristol Royal Infirmary, Bristol, United Kingdom 17.35 - 18.35 Poster viewing (authors to be present) & Drinks 19:15 Drinks reception at the Roman Baths 20:00 Conference Dinner in the Pump Room 4 FRIDAY 19th October 9.00 - 11.10 SESSION 4 Chairpersons Jim Crawley & Anne Goodeve 9.00 - 9.40 TARGETING COMPLEMENT IN AYTYPICAL HAEMOLYTIC SYNDROME. Dr. Daniel Gale, University College London, UK. 9.40 - 9.55 O14 DOMAIN SPECIFICITY OF ANTI-ADAMTS13 ANTIBODIES AT PRESENTATION AND RELAPSE IN THROMBOTIC THROMBOCYTOPENIC PURPURA (TTP) Mari Thomas, Marie Scully, Samuel Machin, James Crawley. Haemostasis Research Unit, Department of Haematology, University College London, UK. Department of Haematology, University College London Hospital, UK. Centre for Haematology, Imperial College London, UK 9.55 - 10.10 O15 ANALYSIS OF PROTEIN DISULPHIDE ISOMERASE MOTIFS (CXXC) IN MATURE VON WILLEBRAND FACTOR. Susie Shapiro, Mike Laffan, Thomas, McKinnon. Centre for Haematology, Division of Experimental Medicine, Department of Medicine and Faculty of Medicine, Imperial College London, London, W12 0NN, United Kingdom 10.10 – 10.25 O16 IDENTIFICATION, CHARACTERISATION AND IN SILICO ANALYSIS OF DELETION BREAKPOINTS IN THE VWF GENE FROM THE EU MCMDM-1VWD COHORT Ashley Cartwright, Daniel Hampshire, Lisa Bloomer, Ian Peake and Anne Goodeve on behalf of the EU-VWD study. Haemostasis Research Group, University of Sheffield, Sheffield, UK 10.25 - 10.40 O17 DIRECT BINDING BETWEEN PROTEIN S AND TFPI IS ESSENTIAL FOR PROTEIN S TO ACT AS A COFACTOR FOR TFPI Josefin Ahnström*, Helena M Andersson*, James TB Crawley, David A Lane. *Authors contributed equally .Centre for Haematology, Division of Experimental Medicine, Imperial College London 10.40 - 11.10 EXHIBITION & coffee & tea URAEMIC 11.10 – 13.05 Session 5 Chairpersons Alastair Poole & Chris Gardiner 11.40 – 12.20 FACTOR VIIa AND PLATELETS. Professor Philip de Groot, University Medical Center, Utrecht. The Netherlands 12.20 – 12:35 O18 THE INTERACTION OF TISSUE FACTOR WITH FILAMIN-A IS ESSENTIAL FOR THE RELEASE OF TISSUE FACTOR INTO ENDOTHELIAL CELL MICROPARTICLES Mary Collier, Anthony Maraveyas, Camille Ettelaie. Biomedical Section, Department of Biological Sciences and Division of Cancer, Postgraduate Medical Institute in association with Hull York Medical School, University of Hull, Cottingham Road, Hull, UK. 12.35 – 12:50 O19 A PROCOAGULANT TIME-BOMB ON ENDOTHELIAL CELLS: THE UPTAKE OF MICROPARTICLES AND RECYCLING OF THE TISSUE FACTOR COMPONENT Camille Ettelaie, Pui Mei Mah, Anthony Maraveyas, Mary EW Collier. Biomedical Section, Department of Biological Sciences and Division of Cancer, Postgraduate Medical Institute in association with Hull York Medical School, University of Hull, Cottingham Road, Hull, UK. 5 12.50 – 13.05 O20 WHEN IS AN ‘ACTIVATED’ PLATELET ACTIVATED? Emily C. Reddy, Robert J. Forster, Sarah O’Neill. School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland. Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, Dublin 2, Ireland. 13.05 - 14.10 LUNCH EXHIBITION & coffee & tea, registration 14.10 – 16.45 Session 6 Chairpersons – Paul Harrison & Henry Watson 14.10 – 14.40 PROTEIN DISULPHIDE ISOMERASES AND HAEMOSTASIS Professor Jon Gibbins, University of Reading, UK 14.40 – 16.40 Scientists in Training best scoring abstracts 14.40 – 14.55 O21 ASPIRIN INHIBITS THE PLATELET-MEDIATED EXPRESSION OF ANTITHROMBOTIC GENES IN MONOCYTES Robert E Turnbull, Julian van Capelleveen, Unni Krishnan, Joy R Wright, Nilesh J Samani, Mieke Trip, Suthesh Sivapalaratnam, Alison H Goodall, Department of Cardiovascular Sciences, University of Leicester, UK and Department of Vascular Medicine, Amsterdam Medical Centre, University of Amsterdam, The Netherlands 14.55 – 15.10 O22 OXIDIZED LOW-DENSITY LIPOPROTEINS INDUCE PLATELET ACTIVATION AND SHAPE CHANGE THROUGH A NOVEL CD36-RHO KINASE DEPENDENT SIGNALLING PATHWAY. Katie S Wraith, Simbarashe Magwenzi, Ahmed Aburima, Yichuan Wen, David Leake and Khalid M Naseem. 1 Centre for Cardiovascular and Metabolic Research, Daisy Building (Research Laboratories), Hull York Medical School, Castle Hill Hospital (Entrance 2), Castle Road, Hull. HU16 5JQ. 2 School of Biological Sciences, University of Reading, Reading UK 15.10 – 15.25 O23 REGULATION OF INTEGRIN CLOSURE IN PROCOAGULANT PLATELETS Nadine J.A. Mattheij, Karen Gilio, Roger van Kruchten, Shawn M Jobe, Xiaoping Du, Adam J. Wieschhaus, Athar H. Chishti, Peter Collins, Johan W.M. Heemskerk, Judith M.E.M. Cosemans. Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands. Department of Pediatrics, Emory University, Atlanta, GA, USA. Department of Pharmacology, University of Illinois, Chicago, USA. Department of Molecular Physiology and Pharmacology Tufts University School of Medicine, Boston, MA, USA. Arthur Bloom Haemophilia Centre, Department of Haematology, Medical School of Cardiff University, University Hospital of Wales, Cardiff, UK. 15.25 – 15.40 O24 THE C DOMAINS AND CERTAIN PREDICTED UNPAIRED CYSTEINES OF VON WILLEBRAND FACTOR ARE ESSENTAL FOR ITS SECRETION Susie Shapiro, Mike Laffan, Thomas McKinnon. Centre for Haematology, Division of Experimental Medicine, Department of Medicine and Faculty of Medicine, Imperial College London, London, W12 0NN, United Kingdom 15.40 – 15.55 O25 THE VWF A2 DOMAIN VICINAL C1669-C1670 DISULPHIDE BOND AND OCCUPANCY OF CALCIUM GOVERN DISTINCT STEPS IN A2 DOMAIN UNFOLDING Christopher Lynch, David A. Lane, Brenda M. Luken. Centre for Haematology, Department of Medicine, Imperial College London 15.55 – 16.10 O26 ASPIRIN ATTENUTES PAI-1 EXPRESSION WI THIN AN ARTERIAL THROMBUS Sameer Kurmani, Robert E Turnbull, Danny Chan, Alison H 6 Goodall. Department of Cardiovascular Sciences, University of Leicester, Glenfield Hospital, Leicester, UK. 16:10 – 16.25 O27 THE EFFECT OF ADAMTS13 MUTATIONS ON ITS SECRETION, ACTIVITY AND SUBCELLULAR LOCATION Mary Underwood, I. Garagiola, I. Mackie, S. Machin & F. Peyvandi. Haemostasis Research Unit, University College London, UK and Angelo Bianchi Bonomi Hemophilia and Thrombosis Centre, University of Milan 16.25 – 16.40 O28 TARGETING OF TYPE I PROTEIN KINASE A TO LIPID RAFTS IS REQUIRED FOR COMPETENT PLATELET INHIBITION BY THE CAMPSIGNALING PATHWAY. Zaher Raslan, Ahmed Aburima, Simbareshe Magwenzi, Kjetil Tasken and Khalid M Naseem. Centre for Cardiovascular and Metabolic Research, Daisy Building (Research Laboratories), Hull York Medical School, Castle Hill Hospital (Entrance 2), Castle Road, Hull, UK. Biotechnology Centre of Oslo, University of Oslo, Blindern, Oslo, Norway 16.45 Close of Conference 7 POSTERS P1 2-ACETYLPHENOTHIAZINE INHIBITS SUPEROXIDE ION GENERATION IN HUMAN PLATELETS AND IMPAIRS COLLAGEN-DEPENDENT THROMBUS FORMATION D.S. Vara (1), M. Campanella (2,3), G. Pula (1). (1), Department of Pharmacy and Pharmacology, University of Bath (UK); (2), Department of Veterinary Basic Sciences, Royal Veterinary College, University of London (UK); (3), Consortium for Mitochondrial Research (CfMR), University College London (UK). P2 CHANGES IN PLATELET FUNCTION DURING STORAGE – EVALUATION OF A FLOW CYTOMETRY METHOD FOR STUDIES OF PLATELET ADHESION AND ACTIVATION Anna Södergren1, Nahreen Tynngård2, Sofia Ramström 1. 1Dept. of Clinical and Experimental Medicine, Clinical Chemistry, Faculty of Health Sciences, Linköping University, S-581 85 Linköping, Sweden. 2 Dept. of Clinical and Experimental Medicine, Transfusion Medicine, Faculty of Health Sciences, Linköping University, S-581 85 Linköping, Sweden. P3 REGULATION OF RHOA ACTIVATION BY CYCLIC AMP DEPENDENT KINASE SIGNALLING A. Aburima, K. Wraith and K.M. Naseem. Centre for Cardiovascular and Metabolic Research, Hull York Medical School, University of Hull, Hull. P4 OXIDISED LDL ACTIVATES PLATELETS NADPH OXIDASE-DEPENDENT INHIBITION OF THE CGMP/PROTEIN KINASE G SIGNALLING CASCADE. Simbarashe Magwenzi, Catriona McNeil, Katie Wraith & Khalid Naseem. Centre for Cardiovascular and Metabolic Research, Hull York Medical School, University of Hull, Hull. P5 A ROLE FOR HISTONE DEACETYLASES IN THE REGULATION OF PLATELET FUNCTION Marfoua S. Ali , Sakthivel Vaiyapuri, Chris I Jones, Jonathan M. Gibbins PhD and Michael J. Fry PhD Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, United Kingdom P6 LARGE-SCALE SCREENING FOR EXTRACELLULAR PROTEIN INTERACTIONS INVOLVED IN PLATELET AGGREGATION Yi Sun & Gavin J. Wright. Cell Surface Signalling Laboratory, Wellcome Trust Sanger Institute, Hinxton, Cambridge CB10 1HH, United Kingdom P7 THE POOL NORM: PERFORMANCES TOWARDS APTT AND FACTOR LEVELS WITH STAGO REAGENTS L. Loï, F. Nicham, K. Berrendonner, K. Carrière. Diagnostica Stago (France) P8 A NOVEL PLATELET FUNCTION ASSAY THAT IDENTIFIES BLEEDING RISK AND QUANTIFIES ANTI-PLATELET DRUG EFFECT A. Lopez-Alonso*, L. Basabe-Desmonts Ϯ, S. Ramstrom Ϯ, B. Jose Ϯ, M. Sommers Ϯ, L. Redahan¥, P. Conlon¥, D. Kenny* Ϯ *NBIPI Program, Molecular & Cellular Therapeutics, Royal College of Surgeons in Ireland (RCSI), Dublin, IRELAND, Ϯ Biomedical Diagnostics Institute (BDI), Dublin City University, Dublin, IRELAND ¥Beaumont Hospital, Nephrology & Renal Transplant Medicine, Dublin IRELAND 8 P9 DOES CITALOPRAM INHIBIT COLLAGEN-INDUCED PLATELET AGGREGATION? Richard D A Wilkinson1 & Gavin E Jarvis2, 1 School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast BT9 7BL, 2 Department of Physiology, Development & Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3EG P10 ADMINISTRATION OF PROTHROMBIN COMPLEX CONCENTRATES FOR WARFARIN REVERSAL – ARE WE GETTING IT RIGHT? Sarah Horton, Rachel Heath, Anthony Houghton, Vanessa Martlew, Jecko Thachil Department of Haematology, Royal Liverpool University Hospital, Liverpool, UK. L7 8XP. P11 Regulation of mouse platelet GPCR receptor function by NHERF proteins Robert J P Pope, Shaista P Nisar, Margaret R Cunningham, Alastair W Poole & Stuart J Mundell. School of Physiology and Pharmacology, Medical Sciences Building, University of Bristol, Bristol, BS8 1TD P12 particulate matter: surface modification, size and thrombotic risk. Smyth E1, Solomon A1, Thorley A2, Tetley T2, Emerson M1 1 Platelet Biology Group and 2Lung Cell Biology Group, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK. P13 THE ANTI-PLATELET EFFECT OF SILDENAFIL IS DEPENDENT ON NITRIC OXIDE: FROM WHERE? Georgina Apostoli and Michael Emerson. Platelet Biology Group, Molecular Medicine, National Heart and Lung Institute, Imperial College London, London SW7 2AZ. P14 NANOPARTICLE INDUCED PLATLET AGGREGATION AND VASULAR THROMBOSIS: ROLE OF DIESEL EXHAUST 1Solomon, A., 1Smyth, E., 1Meetha, N., 2Pitchford, S., 1Luther, P., 1Thorley, A., 1Tetley, T., and 1Michael Emerson. 1Platelet Biology Group, Molecular Medicine Section, National Heart and Lung Institute, Imperial College London, London, UK. 2Institute of Pharmaceutical Science, Kings College London, London, UK P15 A HETEROZYGOTE MISSENSE MUTATION IN A PATIENT WITH GLANZMANN THROMBASTHENIA LOCATED IN THE EXTRACELLULAR DOMAIN OF GPIIb. Edwina Dobbin, Gillian McGaffin, Anne White, Wendy Hannant and David Stirling Haematology Department, Edinburgh Royal Infirmary, 51 Little France Crescent, Edinburgh, EH16 4SA P16 FACTOR XIII DEFICIENCY: MUTATIONS IN THE FACTOR A SUBUNIT (FX13A1) AND FACTOR B SUBUNIT (FX13B) GENES. Edwina Dobbin, Gillian McGaffin, Anne White, Wendy Hannant and David Stirling. Haematology Department, Edinburgh Royal Infirmary, 51 Little France Crescent, Edinburgh, EH16 4SA P17 CURRENT TRENDS IN THE USE OF INFERIOR VENACAVA FILTERS Megan Kell, Richard McWilliams, Vanessa Martlew, Jecko Thachil Department of Haematology and Radiology, Royal Liverpool University Hospital, Liverpool, UK. L7 8XP. 9 P18 RELATIVE ROLES OF PLATELET-DERIVED THROMBOXANE A2 AND 12-HPETE/HETE IN THE REGULATION OF PLATELET AGGREGATION AND ADHESION 1Francesca Rauzi, 1,2Nicholas Kirkby, 2Jane A. Mitchell & 1Timothy D. Warner. 1The William Harvey Research Institute, Barts & the London School of Medicine & Dentistry, Charterhouse Square, London EC1M 6BQ; 2National Heart & Lung Institute, Imperial College, Dovehouse Street, London SW3 6LY. P19 EVALUATION OF THE EFFECTS OF DABIGATRAN ON SPECIALIST COAGULATION ASSASYS. Johnson AE, Kitchen S, Maclean R. Coagulation Department, Royal Hallamshire Hospital, Sheffield, Glossop Road, S10 2JF. P20 EVALUATION OF THE EFFECTS OF DABIGATRAN ON ROUTINE COAGULATION TESTS. Johnson AE, Kitchen S, Maclean R. Coagulation Department, Royal Hallamshire Hospital, Sheffield, Glossop Road, S10 2JF. P21 EXTRACORPOREAL MEMBRANE OXYGENATION (ECMO) INDUCES NEUTROPHILS TO RELEASE INTRACELLULAR DNA LEADING TO HAEMOSTASIS ACTIVATION. Grace Britton1, Simon Davidson2, Sharon Mumby1, Mark Griffiths1, Gregory Quinlan1. Department of Critical Care Medicine, Royal Brompton Hospital and National Heart and Lung Institute, Imperial College, London, UK1, Department of Haematology, Royal Brompton Hospital, London, UK 2 P22 ESTABLISHING A CELL BASED ASSAY OF FIBRINOLYSIS Sarah Mangles, Carolyn Millar and Mike Laffan. Imperial College, London P23 SAFETY AND EFFICACY OF FACTOR XI CONCENTRATE FOR COVERING SURGERY IN PATIENTS WITH FACTOR XI DEFICIENCY Huseini Kagdi, Pratima Chowdary and Keith Gomez. Katherine Dormandy Haemophilia Centre and Thrombosis Unit, Royal Free Campus, University College London Medical School P24 DIAGNOSIS OF HEPARIN-INDUCED THROMBOCYTOPENIA USING THE HITAlert ASSAY Bhavesh M Popat1, Chris Watson2, Kevin Horner3, Barbara Hopkins2, Simon Davidson4, Steve Kitchen3, Joost J van Veen3, Sue Pavord2, Gillian Swallow2, Alison H Goodall1. 1Department of Cardiovascular Sciences, University of Leicester, 2Department of Haematology, Leicester Royal Infirmary, 3Department of Haematology, Sheffield Hallam Hospital, Sheffield and 4Royal Brompton Hospital, London, UK. P25 ASSESSMENT OF A NEW CHROMOGENIC FIX ASSAY. Leeson KJ, Bowyer AE, Kitchen S, van Veen J J, Makris M. Coagulation Department, Royal Hallamshire Hospital, Sheffield. P26 THE ‘USEFULNESS’ OF A VERY HIGH D-DIMER Rachel Heath, Sarah Horton, Vanessa Martlew, Jecko Thachil Department of Haematology, Royal Liverpool University Hospital, Liverpool, UK. L7 8XP. 10 P27 PKC AND AKT-DEPENDENT INHIBITION OF GSK3 MODULATES PLATELET FUNCTION Samantha F. Moore, Marion T.J. van den Bosch, Roger W. Hunter and Ingeborg Hers School of Physiology and Pharmacology, University of Bristol, Bristol, BS8 1TD, UK. P28 DIRECT INTERACTION WITH CANCER CELLS IS NECESSARY TO INDUCE PLATELET ACTIVATION Annachiara Mitrugno, Niamh Moran.Royal College of Surgeons In Ireland, 123 St Stephen Green, Dublin 2 P29 GAUCHER DISEASE: AN INHERITED DISORDER WITH AN ACQUIRED BLEEDING DIATHESIS AS Thomas1,2, DA Hughes1,2, AB Mehta2 & K Gomez1,3 1Department of Academic Haematology, University College London 2Lysosomal Storage Disorders Unit & 3Katherine Dormandy Haemophilia Centre & Thrombosis Unit, Royal Free Hospital, London NW3 2QG P30 EVALUATION OF A NEW ADAMTS-13 ANTIBODY ASSAY. Fretwell RE, Van Veen J, Kitchen S. Sheffield Haemophilia and Thrombosis Centre, Royal Hallamshire Hospital, Glossop Road, Sheffield, S10 2JF. P31 BAMBI (BMP AND ACTIVIN MEMBRANE BOUND INHIBITOR) - A NOVEL REGULATOR OF PLATELET PRODUCTION AND FUNCTION Isabelle I. Salles, David A. Lane James T.B. Crawley. Centre for Haematology, Imperial College London, 5th Floor Commonwealth Building, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN P32 DEFINING THE ROLE OF RHOF (RIF) IN PLATELETS R. Goggs1, J.S. Savage1, H. Mellor2, A.W. Poole1 1School of Physiology and Pharmacology, 2School of Biochemistry, Faculty of Medical and Veterinary Sciences, University of Bristol, University Walk, Bristol BS8 1TD P33 ACTIN ANTAGONISTS DECREASE GPVI DIMERIZATION AND MODIFY THE DISTRIBUTION OF GPVI IN PLATELET CYTOSKELETAL FRACTIONS Stephanie M. Jung,1 Steve P. Watson,2 Richard W. Farndale,1 and Masaaki Moroi1, 1Department of Biochemistry, University of Cambridge, Cambridge, UK and 2 Centre for Cardiovascular Sciences, University of Birmingham, UK P34 A COMPARATIVE EVALUATION OF A NEW VON WILLEBRAND FACTOR ACTIVITY ASSAY WITH AN ESTABLISHED AUTOMATED PLATELET BASED RISTOCETIN COFACTOR ASSAY AS Lawrie1, F Stufano 2, MT Canciani2, IJ Mackie1, SJ Machin1, F Peyvandi1, 2. 1Haemostasis Research Unit, Department of Haematology, University College London, London, UK. 2U.O.S. Dipartimentale per la Diagnosi e la Terapia delle Coagulopatie , A. Bianchi Bonomi Hemophilia and Thrombosis Center, Fondazione I.R.C.C.S. Ca' Granda, Ospedale Maggiore Policlinico, Università degli Studi di Milano and Luigi Villa Foundation, Milan, Italy 11 P35 PLATELET FUNCTION AND ACUTE WHOLE BLOOD PROSTANOID FORMATION IN TWO PATIENTS POSSESSING A HOMOZYGOUS MUTATION IN THE GENE ENCODING CYTOSOLIC PHOSPHOLIPASE A2α Kirkby NS1,2, Brooke MA3, Longhurst HJ4, Plagnol V5, Kelsell DP3, MacDonald TT3 , Mitchell JA2, Warner TD1. 1William Harvey Research Institute, Barts & the London School of Medicine, Queen Mary University of London, UK; 2National Heart & Lung Institute, Imperial College, London, UK; 3Blizard Institute, Barts & the London School of Medicine, Queen Mary University of London, UK; 4Department of Clinical Immunology, Barts Health NHS Trust, London, UK; 5Darwin Building, University College London Genetics Institute, University College London, UK; P36 IDENTIFICATION OF A NOVEL THROMBOXANE A2 RECEPTOR N42S VARIANT THAT IS NOT GLYCOSYLATED RESULTING IN REDUCED SURFACE EXPRESSION S. Nisar1, B.B. Dawood2, M.L.Jones3, S.Murden3, A.D. Mumford3, J.T Wilde4, S.P.Watson2 & S.J. Mundell1 on behalf of the UK GAPP Study Group. 1School of Physiology and Pharmacology, University of Bristol, Bristol, BS8 1TD; 2Centre for Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, B15 2TT; 3Bristol Heart Institute & School of Cellular and Molecular Medicine, University of Bristol, Bristol, BS2 8HW; 4West Midlands Adult Haemophilia Centre, University Hospital Birmingham National Health Service (NHS) Trust, Birmingham, United Kingdom. P37 FIBRINOGEN -CHAIN CROSS-LINKING INCREASES FIBRE THICKNESS OVER TIME, AND STRAIGHTENS FIBRIN FIBRES Cédric Duval1, Victoria Ridger2, Helen Philippou1, Robert Ariëns1. 1Mechanisms of Thrombosis; Division of Cardiovascular and Diabetes Research; The Leeds Institute of Genetics, Health and Therapeutics; University of Leeds; UK. 2Department of Cardiovascular Science; Faculty of Medicine, Dentistry and Health; University of Sheffield; UK. P38 A SYSTEMS-BIOLOGY STUDY OF THE COAGULATION CASCADE Joanne Dunster1,2, Helen Byrne3, Susan Franks4, Jon Gibbins2 , John King5. 1 Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, 2 Department of Mathematics and Statistics, University of Reading , 3 Oxford Centre for Collaborative Applied Mathematics, Mathematical Institute, Oxford OX1 3LB and Department of Comp. Sci., Parks Road, Oxford OX1 3QD,4 Health and Safety Laboratory, Harpur Hill, Buxton, Derbyshire SK17 9JN , & 5 Centre for Mathematical Medicine, School of Mathematical Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, UK . P39 A SYSTEMS BIOLOGY STUDY OF PLATELET GPVI SIGNALLING Joanne Dunster1,2, Francoise Mazet1, Sakthi vel Vaiyapuri1, Chris I. Jones1, Will Kaiser1, Marcus Tindall1,2, Michael J. Fry1, Jonathan M. Gibbins1. 1Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, 2Department of Mathematics and Statistics, University of Reading. P40 PLATELET PHENOTYPE ASSOCIATED WITH THE LOSS-OF-FUNCTION Trp29CysTHROMBOXANE RECEPTOR VARIANT S. Westbury1, S. Nisar2, M.L. Jones1, L. Darnige, C3. Bachelot-Loza, S3. Gandrille3, F. Zinzindoue3, AM. Fischer3, S.J. Mundell2, P. Gaussem3, A.D. Mumford1 and the UK GAPP study group. 1 Bristol Heart Institute, University of Bristol, Bristol, BS2 8HW; 2 School of Physiology and Pharmacology, University of Bristol, Bristol, BS8 1TD; 3 Université Paris Descartes, Sorbonne Paris Cité, Paris; INSERM UMR-S765, Faculté de Pharmacie, Paris and AP-HP, Hôpital Européen Georges Pompidou, Paris. 12 P41 FXIII POLYMORPHISMS AND DIABETES IN ABDOMINAL AORTIC ANEURSYM Macrae F, Lee Evans H, Sohrabi S, Johnson A, Scott DJA, Ariëns RAS. Mechanisms of Thrombosis; Division of Cardiovascular and Diabetes Research; The Leeds Institute of Genetics, Health and Therapeutics; University of Leeds; UK P42 RITUXIMAB FOR THE TREATMENT OF THROMBOTIC THROMBOCYTOPENIC PURPURA: BENEFITS OF EARLY ADMINISTRATION IN ACUTE EPISODES AND ROLE OF ELECTIVE TREATMENT IN PREVENTING RELAPSE Westwood J1, Webster H1, McGuckin S2, Machin SJ1, Scully M2. 1Haemostasis Research Unit, University College London, London, United Kingdom. 2University College London Hospital, London, United Kingdom P43 PILOT GENOME-WIDE ASSOCIATION STUDY OF THROMBOTIC THROMBOCYTOPENIC PURPURA: ASSOCIATIONS IN HLA II and III AND B-CELL DEVELOPMENT. Heelas EO, 1 Eu-Ahsunthornwattang J,2 Petridis C,4 Papouli E,4 McDonald V,1 Machin S,1 Cordell H,2 Scully, M.1,3 . 1 Haemostasis Research Unit, Department of Haematology, University College London, London, WC1E 6HX. 2 Institute of Genetic Medicine, Newcastle University, International Centre for Life, Newcastle, NE1 3BZ. 3 University College London Hospital, Euston Road, London, NW1 2BU. 4 Biomedical Research Centre, King’s College London, St Thomas’ Street, London, SE1 9RT P44 THE ROLE OF FAK FAMILY MEMBERS IN GPVI-DEPENDENT REACTIVE OXYGEN SPECIES FORMATION Naadiya Carrim§, Tony G. Walsh§, Alessandra Consonni¥, Mauro Torti¥, Michael C. Berndt§¤, Pat Metharom§. § Department of Experimental Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland. ¤ Biomedical Diagnostics Institute, Dublin City University, Dublin, Ireland. ¥ Department of Biochemistry, University of Pavia, Italy P45 INVERSION OF CHROMOSOME 5 AS A NEW MECHANISM OF HERMANSKY-PUDLAK SYNDROME 2. Matthew Jones1, Sherina Murden1, Viv Maloney2, Richard Manning3, Kimberly Gilmour4, V Bharadwaj5, J de la Fuente5, Subrana Chakravorty5, and Andrew Mumford1. 1 Bristol Heart Institute & School of Cellular and Molecular Medicine, University of Bristol.2 Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury. 3 Department of Haematology, Imperial College Academic Health Care Trust, Hammersmith Hospital, London. 4 Department of Immunology, Great Ormond Street Hospital for Children NHS Trust, London 5 Department of Paediatric Haematology, St Marys Hospital, Imperial College Healthcare NHS Trust. P46 ABNORMALITIES IN PLATELET COUNT AND COAGULATION SCREEN IN INTENSIVE CARE Y. Arunan, Critical Care Unit, Royal Liverpool University Hospital. C. L. Khoo, Critical Care Unit, Royal Liverpool University Hospital. J. Walker, Critical Care Unit, Royal Liverpool University Hospital. J. Thachil, Department of Haematology, Royal Liverpool University Hospital. P47 PLATELET COUNTING ON THE ACCURI C6 FLOW CYTOMETER. Andrew Masters and Paul Harrison. Oxford Haemophilia & Thrombosis Centre, Churchill Hospital and Department of Haematology, The John Radcliffe, Oxford University Hospitals NHS Trust, Oxford, UK. 13 P48 P-SELECTIN AS A SIMPLE-TO-USE APPROACH FOR ASSESSING PLATELET FUNCTION IN CARDIAC PATIENTS: A COMPARISON WITH FOUR OTHER PLATELET FUNCTION TESTS Sue Fox, Jane May, Andrew Johnson, Ann White, Jackie Glenn, Natasha Dovlatova, Yanushi Wijeyeratne, Stan Heptinstall. Cardiovascular Medicine, University of Nottingham, Queens Medical Centre, Nottingham, UK P49 EVALUATION OF THE OPTIMUL ASSAY AS A TOOL TO DETECT EX VIVO PLATELET INHIBITION IN ACUTE CORONARY SYNDROME PATIENTS RECEIVING DUAL ANTIPLATELET THERAPY Jane May1, Natalia Dovlatova1, Nicholas S. Kirkby2, Timothy D. Warner2 and Sue Fox1 1Cardiovascular Medicine, University of Nottingham, Queens Medical Centre, Nottingham UK and 2The William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, London, UK P50 WHOLE BLOOD PLATELET AGGREGATION MEASURED BY SINGLE PLATELET COUNTING USING A NEW DOUBLE FIXATION APPROACH TO FACILITATE REMOTE TESTING Mohammad Algahtani, Jane May, Ann White, Natalia Dovlatova, Andrew Johnson, Stan Heptinstall, Sue Fox. Cardiovascular Medicine, University of Nottingham, Queen’s Medical Centre, Nottingham UK P51 F7 MUTATION ANALYSIS AND THE INFLUENCE OF POLYMORPHISMS IN THE SCOTTISH FVII DEFICIENCY COHORT. Gillian McGaffin1, Anne White1, R Campbell Tait2, Catherine Bagot2, Henry Watson3 and David Stirling1. 1 Haematology Department, Edinburgh Royal Infirmary, 51 Little France Crescent, Edinburgh, EH16 4SA, 2 West of Scotland Haemophilia Centre, Glasgow Royal Infirmary, 84 Castle Street, Glasgow, G4 0SF. 3 Haematology Department, Aberdeen Royal Infirmary, Foresterhill, Aberdeen, AB25 2ZN. P52 SIGNALLING VIA CLEC-2 GENERATES A PROCOAGULANT RESPONSE IN PLATELETS Mohammed A Alsahli1, Jacky A Appleby1, Hassan S Hamali1, Joy R Wright1, Steve P Watson2, Alison H Goodall1. 1Department of Cardiovascular Sciences, University of Leicester, and 2Centre for Cardiovascular Sciences Institute of Biomedical Research, University of Birmingham. P53 STIM1 BINDS TO A NUMBER OF PROTEINS IN HUMAN PLATELETS. Archana Ambily and Kalwant S. Authi. Cardiovascular Division, Kings College London, 150 Stamford Street. London SE1 9NH P54 COMPARISON OF THE IN VITRO ACTIVITY OF PLASMA-DERIVED AND RECOMBINANT FIX CONCENTRATES. Yao Yu, Mike A Laffan, Carolyn Millar. Centre for Haematology, Imperial College London, London UK. P55 HOW COMMON IS OSTEOPOROSIS WITH LOW MOLECULAR WEIGHT HEPARIN? Klaire Exarchou, Jecko Thachil. Department of Haematology, Royal Liverpool University Hospital, Liverpool, UK. L7 8XP. 14 P56 VON WILLEBRAND FACTOR SIALYLATION STATUS MODIFIES ITS FUNCTION UNDER SHEAR STRESS Agata A Nowak, Mike A Laffan, Thomas AJ McKinnon. Department of Haematology, Faculty of Medicine, Hammersmith Hospital Campus, Imperial Collage London, P57 AN IN VITRO FLOW ASSAY TO ANALYSE VON WILLEBRAND FACTOR PROTEOLYSIS BY ADAMTS13 Thomas A J McKinnon, Agata A Nowak, Aia Mehdi, Carol Wooding and Mike A Laffan. Department of Haematology, Faculty of Medicine, Hammersmith Hospital Campus, Imperial College London. P58 THROMBUS FORMATION UNDER FLOW CONDITIONS IS ENHANCED AFTER DESMOPRESSIN TREATMENT IN PATIENTS WITH POSTOPERATIVE BLEEDING COMPLICATIONS Frauke Swieringa1, Geert-Jan Kuiper1, Marcus D. Lancé2, Johan W.M. Heemskerk1 and Paola E.J van der Meijden1 Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands. 2 Department of Anesthesiology, Maastricht University Medical Centre, Maastricht, The Netherlands P59 PLATELET FUNCTION TESTING – RATIONALISING RECOMMENDED AGONISTS AND CONCURRENT USE OF A REMOTE WHOLE BLOOD ASSAY Gillian C. Lowe1*, Marie Lordkipanidze1*, Natalia Dovlatova1,2, Ban Dawood1, Stan Heptinstall2, Sue Fox2 and Steve Watson1 on behalf of the UK GAPP Study Group. *These authors contributed equally to this work. 1Centre for Cardiovascular Sciences, Institute of Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, 2Cardiovascular Medicine, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH P60 ROLE OF GAP JUNCTIONS AND CONNEXIN HEMICHANNELS IN PLATELET FUNCTION Sakthivel Vaiyapuri1, Chris I. Jones1, Parvathy Sasikumar1, Leonardo A. Moraes1, Marfoua S. Ali1, Tanya Sage1, Alexander M. Simon2, Martyn P. Mahaut-Smith3, Jonathan M. Gibbins1. 1Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, United Kingdom. 2Department of Physiology, University of Arizona, Tucson, USA. 3Department of Cell Physiology & Pharmacology, University of Leicester, Leicester, United Kingdom P61 PURIFICATION AND FUNCTIONAL CHARACTERISATION OF RHINOCETIN, A SNACLEC FROM THE VENOM OF BITIS GABONICA RHINOCEROS Sakthivel Vaiyapuri1, Marfoua S. Ali1, Robert A. Harrison2, Andrew B. Bicknell1, Jonathan M. Gibbins1. 1Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, United Kingdom 2Liverpool School of Tropical Medicine, Liverpool, United Kingdom