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Total 198 results found since Jan 2013.
Increased stroke size following MCA occlusion in a mouse model of sickle cell disease
Source: Blood - March 20, 2014 Category: Hematology Authors: Luo, W., Su, E. J., Wang, J., Wang, H., Guo, C., Pawar, A., Campbell, A. D., Lawrence, D. A., Eitzman, D. T. Tags: Sickle Cell Disease, Red Cells, Iron, and Erythropoiesis, Vascular Biology CORRESPONDENCE Source Type: research
Spontaneous heparin-induced thrombocytopenia syndrome: 2 new cases and a proposal for defining this disorder
We describe 2 new cases presenting with thrombotic stroke/thrombocytopenia: one following shoulder hemi-arthroplasty (performed without heparin) and the other presenting to the emergency room without prior hospitalization, heparin exposure, or preceding infection. Both patients tested strongly positive for anti-platelet factor 4 (PF4)/heparin immunoglobulin (Ig)G in 2 different immunoassays and in the platelet serotonin-release assay. Crucially, both patients’ sera also caused strong (>80%) serotonin release in the absence of heparin, a serologic feature characteristic of delayed-onset HIT (ie, where heparin use p...
Source: Blood - June 5, 2014 Category: Hematology Authors: Warkentin, T. E., Basciano, P. A., Knopman, J., Bernstein, R. A. Tags: Free Research Articles, Platelets and Thrombopoiesis, Thrombosis and Hemostasis, Brief Reports Source Type: research
Lower risk for serious adverse events and no increased risk for cancer after PBSC vs BM donation
In conclusion, SAEs after donation are rare but more often occurred in BM donors and women. In addition, there was no evidence of increased risk for cancer, autoimmune illness, and stroke in donors receiving granulocyte colony-stimulating factor during this period of observation.
Source: Blood - June 5, 2014 Category: Hematology Authors: Pulsipher, M. A., Chitphakdithai, P., Logan, B. R., Navarro, W. H., Levine, J. E., Miller, J. P., Shaw, B. E., O'Donnell, P. V., Majhail, N. S., Confer, D. L. Tags: Transfusion Medicine, Transplantation Source Type: research
Targeted mutagenesis of zebrafish antithrombin III triggers disseminated intravascular coagulation and thrombosis, revealing insight into function
Pathologic blood clotting is a leading cause of morbidity and mortality in the developed world, underlying deep vein thrombosis, myocardial infarction, and stroke. Genetic predisposition to thrombosis is still poorly understood, and we hypothesize that there are many additional risk alleles and modifying factors remaining to be discovered. Mammalian models have contributed to our understanding of thrombosis, but are low throughput and costly. We have turned to the zebrafish, a tool for high-throughput genetic analysis. Using zinc finger nucleases, we show that disruption of the zebrafish antithrombin III (at3) locus result...
Source: Blood - July 3, 2014 Category: Hematology Authors: Liu, Y., Kretz, C. A., Maeder, M. L., Richter, C. E., Tsao, P., Vo, A. H., Huarng, M. C., Rode, T., Hu, Z., Mehra, R., Olson, S. T., Joung, J. K., Shavit, J. A. Tags: Thrombosis and Hemostasis Source Type: research
Platelet 12-LOX is essential for Fc{gamma}RIIa-mediated platelet activation
In this study, we show for the first time that platelet 12(S)-lipoxygenase (12-LOX), a highly expressed oxylipin-producing enzyme in the human platelet, is an essential component of FcRIIa-mediated thrombosis. Pharmacologic inhibition of 12-LOX in human platelets resulted in significant attenuation of FcRIIa-mediated aggregation. Platelet 12-LOX was shown to be essential for FcRIIa-induced phospholipase C2 activity leading to activation of calcium mobilization, Rap1 and protein kinase C activation, and subsequent activation of the integrin αIIbβ3. Additionally, platelets from transgenic mice expressing human FcR...
Source: Blood - October 2, 2014 Category: Hematology Authors: Yeung, J., Tourdot, B. E., Fernandez-Perez, P., Vesci, J., Ren, J., Smyrniotis, C. J., Luci, D. K., Jadhav, A., Simeonov, A., Maloney, D. J., Holman, T. R., McKenzie, S. E., Holinstat, M. Tags: Platelets and Thrombopoiesis, Thrombosis and Hemostasis Source Type: research
Platelet transfusions in platelet consumptive disorders are associated with arterial thrombosis and in-hospital mortality
This study utilized the Nationwide Inpatient Sample to evaluate the current in-hospital platelet transfusion practices and their association with arterial/venous thrombosis, acute myocardial infarction (AMI), stroke, and in-hospital mortality over 5 years (2007-2011). Age and gender-adjusted odds ratios (adjOR) associated with platelet transfusions were calculated. There were 10 624 hospitalizations with TTP; 6332 with HIT and 79 980 with ITP. Platelet transfusions were reported in 10.1% TTP, 7.1% HIT, and 25.8% ITP admissions. Platelet transfusions in TTP were associated with higher odds of arterial thrombosis (adjOR = 5....
Source: Blood - February 26, 2015 Category: Hematology Authors: Goel, R., Ness, P. M., Takemoto, C. M., Krishnamurti, L., King, K. E., Tobian, A. A. R. Tags: Thrombocytopenia, Transfusion Medicine, Free Research Articles, Platelets and Thrombopoiesis, Clinical Trials and Observations Source Type: research
Chronic acute anemia and extracranial internal carotid stenosis are risk factors for silent cerebral infarcts in sickle cell anemia
This study includes 189 stroke-free patients with SCA from the Créteil newborn cohort (1992-2010) followed longitudinally by magnetic resonance imaging/MRA, including cervical MRA at the last assessment. All patients with abnormal TCD and/or intracranial stenoses were placed on a transfusion program. Mean follow-up was 9.9 years (range, 2.2-19.9 years; 1844 patient-years). Annual rates of clinical events were calculated. The cumulative risk for SCI was 39.1% (95% confidence interval [CI], 23.5%-54.7%) by age 18 years, with no plateau. We confirm that baseline hemoglobin level lower than 7 g/dL before age 3 years is ...
Source: Blood - March 5, 2015 Category: Hematology Authors: Bernaudin, F., Verlhac, S., Arnaud, C., Kamdem, A., Vasile, M., Kasbi, F., Hau, I., Madhi, F., Fourmaux, C., Biscardi, S., Epaud, R., Pondarre, C. Tags: Sickle Cell Disease, Free Research Articles, Red Cells, Iron, and Erythropoiesis Source Type: research
Chronic and acute anemia and extracranial internal carotid stenosis are risk factors for silent cerebral infarcts in sickle cell anemia
This study includes 189 stroke-free patients with SCA from the Créteil newborn cohort (1992-2010) followed longitudinally by magnetic resonance imaging/MRA, including cervical MRA at the last assessment. All patients with abnormal TCD and/or intracranial stenoses were placed on a transfusion program. Mean follow-up was 9.9 years (range, 2.2-19.9 years; 1844 patient-years). Annual rates of clinical events were calculated. The cumulative risk for SCI was 39.1% (95% confidence interval [CI], 23.5%-54.7%) by age 18 years, with no plateau. We confirm that baseline hemoglobin level lower than 7 g/dL before age 3 years is ...
Source: Blood - March 5, 2015 Category: Hematology Authors: Bernaudin, F., Verlhac, S., Arnaud, C., Kamdem, A., Vasile, M., Kasbi, F., Hau, I., Madhi, F., Fourmaux, C., Biscardi, S., Epaud, R., Pondarre, C. Tags: Sickle Cell Disease, Free Research Articles, Red Cells, Iron, and Erythropoiesis Source Type: research
Activated protein C: biased for translation
The homeostatic blood protease, activated protein C (APC), can function as (1) an antithrombotic on the basis of inactivation of clotting factors Va and VIIIa; (2) a cytoprotective on the basis of endothelial barrier stabilization and anti-inflammatory and antiapoptotic actions; and (3) a regenerative on the basis of stimulation of neurogenesis, angiogenesis, and wound healing. Pharmacologic therapies using recombinant human and murine APCs indicate that APC provides effective acute or chronic therapies for a strikingly diverse range of preclinical injury models. APC reduces the damage caused by the following: ischemia/rep...
Source: Blood - May 7, 2015 Category: Hematology Authors: Griffin, J. H., Zlokovic, B. V., Mosnier, L. O. Tags: Vascular Biology, Review Articles Source Type: research
How I treat and manage strokes in sickle cell disease
Neurologic complications are a major cause of morbidity and mortality in sickle cell disease (SCD). In children with sickle cell anemia, routine use of transcranial Doppler screening, coupled with regular blood transfusion therapy, has decreased the prevalence of overt stroke from ~11% to 1%. Limited evidence is available to guide acute and chronic management of individuals with SCD and strokes. Current management strategies are based primarily on single arm clinical trials and observational studies, coupled with principles of neurology and hematology. Initial management of a focal neurologic deficit includes evaluation by...
Source: Blood - May 28, 2015 Category: Hematology Authors: Kassim, A. A., Galadanci, N. A., Pruthi, S., DeBaun, M. R. Tags: Sickle Cell Disease, How I Treat, Free Research Articles, Red Cells, Iron, and Erythropoiesis, Clinical Trials and Observations Source Type: research
Targeted downregulation of platelet CLEC-2 occurs through Syk-independent internalization
Platelet aggregation at sites of vascular injury is not only essential for hemostasis, but may also cause acute ischemic disease states such as myocardial infarction or stroke. The hemi-immunoreceptor tyrosine-based activation motif–containing C-type lectinlike receptor 2 (CLEC-2) mediates powerful platelet activation through a Src- and spleen tyrosine kinase (Syk)–dependent tyrosine phosphorylation cascade. Thereby, CLEC-2 not only contributes to thrombus formation and stabilization but also plays a central role in blood-lymphatic vessel development, tumor metastasis, and prevention of inflammatory bleeding, m...
Source: Blood - June 25, 2015 Category: Hematology Authors: Lorenz, V., Stegner, D., Stritt, S., Vogtle, T., Kiefer, F., Witke, W., Schymeinsky, J., Watson, S. P., Walzog, B., Nieswandt, B. Tags: Thrombocytopenia, Platelets and Thrombopoiesis THROMBOSIS AND HEMOSTASIS Source Type: research
Association between ENPP1 K173Q and stroke in a newborn cohort of 395 Brazilian children with sickle cell anemia
Source: Blood - September 3, 2015 Category: Hematology Authors: Belisario, A. R., Sales, R. R., Toledo, N. E., Velloso-Rodrigues, C., Silva, C. M., Viana, M. B. Tags: Pediatric Hematology, Sickle Cell Disease, Red Cells, Iron, and Erythropoiesis CORRESPONDENCE Source Type: research
Platelets induce apoptosis via membrane-bound FasL
After tissue injury, both wound sealing and apoptosis contribute to restoration of tissue integrity and functionality. Although the role of platelets (PLTs) for wound closure and induction of regenerative processes is well established, the knowledge about their contribution to apoptosis is incomplete. Here, we show that PLTs present the death receptor Fas ligand (FasL) on their surface after activation. Activated PLTs as well as the isolated membrane fraction of activated PLTs but not of resting PLTs induced apoptosis in a dose-dependent manner in primary murine neuronal cells, human neuroblastoma cells, and mouse embryoni...
Source: Blood - September 17, 2015 Category: Hematology Authors: Schleicher, R. I., Reichenbach, F., Kraft, P., Kumar, A., Lescan, M., Todt, F., Gobel, K., Hilgendorf, I., Geisler, T., Bauer, A., Olbrich, M., Schaller, M., Wesselborg, S., O'Reilly, L., Meuth, S. G., Schulze-Osthoff, K., Gawaz, M., Li, X., Kleinschnitz, Tags: Platelets and Thrombopoiesis, Thrombosis and Hemostasis Source Type: research
Platelet-derived VWF in the stroke spotlight
Source: Blood - October 1, 2015 Category: Hematology Authors: Flood, V. H. Tags: Free Research Articles COMMENTS Source Type: research
