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  1. Article ; Online: Higher levels of von Willebrand factor in hospitalised patient plasma provides an explanation for the association of ABO blood group and secretor status with COVID19 severity.

    Mankelow, Tosti J / Blair, Allison / Arnold, David T / Hamilton, Fergus W / Gillespie, Kathleen M / Anstee, David J / Toye, Ashley M

    Transfusion medicine (Oxford, England)

    2022  Volume 32, Issue 3, Page(s) 261–262

    MeSH term(s) ABO Blood-Group System/genetics ; Blood Grouping and Crossmatching ; COVID-19 ; Factor VIII ; Humans ; von Willebrand Factor/genetics
    Chemical Substances ABO Blood-Group System ; von Willebrand Factor ; Factor VIII (9001-27-8)
    Language English
    Publishing date 2022-03-24
    Publishing country England
    Document type Letter
    ZDB-ID 1067989-3
    ISSN 1365-3148 ; 0958-7578
    ISSN (online) 1365-3148
    ISSN 0958-7578
    DOI 10.1111/tme.12860
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Large red cell-derived membrane particles are major contributors to hypercoagulability in sickle cell disease.

    Smith, Rachel A / Mankelow, Tosti J / Drizou, Despoina / Bullock, Thomas / Latham, Tom / Trompeter, Sara / Blair, Allison / Anstee, David J

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 11035

    Abstract: Sickle cell disease (SCD) is one of the most common inherited single gene disorders. Polymerisation of sickle hemoglobin results in erythrocytes that are inflexible and adherent, leading to coagulation, vascular and cellular activation and resultant ... ...

    Abstract Sickle cell disease (SCD) is one of the most common inherited single gene disorders. Polymerisation of sickle hemoglobin results in erythrocytes that are inflexible and adherent, leading to coagulation, vascular and cellular activation and resultant blood vessel blockage. Previous studies have observed elevated numbers of red cell-derived particles (RCDP), also denoted extracellular vesicles, in SCD plasma. Here, imaging flow cytometry was used to quantify all RCDP in SCD plasma. A more heterogenous population of RCDP was observed than previously reported. Significantly, large right side-out red cell macrovesicles (MaV), 7 µm in diameter, were identified. Most RCDP were right side-out but a minor population of inside-out vesicles was also present. Electron micrographs confirmed the heterogenous nature of the RCDP detected. All MaV are decorated with prothrombotic phosphatidylserine (PS) and their removal from plasma lengthened clotting times by more than three-fold. Removal of all right side-out RCDP from SCD patient plasma samples resulted in a seven-fold increase in clotting time. These results indicate that MaV comprise a large area of prothrombotic membrane and are thus major contributors to hypercoagulation in SCD. Consequently, controlled removal of MaV and PS exposed RCDP from plasma could provide a novel therapy for managing this disease.
    MeSH term(s) Anemia, Sickle Cell ; Blood Coagulation ; Erythrocyte Membrane ; Phosphatidylserines/metabolism ; Thrombin/metabolism ; Thrombophilia
    Chemical Substances Phosphatidylserines ; Thrombin (EC 3.4.21.5)
    Language English
    Publishing date 2021-05-26
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-90477-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Large red cell-derived membrane particles are major contributors to hypercoagulability in sickle cell disease

    Rachel A. Smith / Tosti J. Mankelow / Despoina Drizou / Thomas Bullock / Tom Latham / Sara Trompeter / Allison Blair / David J. Anstee

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 9

    Abstract: Abstract Sickle cell disease (SCD) is one of the most common inherited single gene disorders. Polymerisation of sickle hemoglobin results in erythrocytes that are inflexible and adherent, leading to coagulation, vascular and cellular activation and ... ...

    Abstract Abstract Sickle cell disease (SCD) is one of the most common inherited single gene disorders. Polymerisation of sickle hemoglobin results in erythrocytes that are inflexible and adherent, leading to coagulation, vascular and cellular activation and resultant blood vessel blockage. Previous studies have observed elevated numbers of red cell-derived particles (RCDP), also denoted extracellular vesicles, in SCD plasma. Here, imaging flow cytometry was used to quantify all RCDP in SCD plasma. A more heterogenous population of RCDP was observed than previously reported. Significantly, large right side-out red cell macrovesicles (MaV), 7 µm in diameter, were identified. Most RCDP were right side-out but a minor population of inside-out vesicles was also present. Electron micrographs confirmed the heterogenous nature of the RCDP detected. All MaV are decorated with prothrombotic phosphatidylserine (PS) and their removal from plasma lengthened clotting times by more than three-fold. Removal of all right side-out RCDP from SCD patient plasma samples resulted in a seven-fold increase in clotting time. These results indicate that MaV comprise a large area of prothrombotic membrane and are thus major contributors to hypercoagulation in SCD. Consequently, controlled removal of MaV and PS exposed RCDP from plasma could provide a novel therapy for managing this disease.
    Keywords Medicine ; R ; Science ; Q
    Subject code 610
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Blood group type A secretors are associated with a higher risk of COVID-19 cardiovascular disease complications.

    Mankelow, Tosti J / Singleton, Belinda K / Moura, Pedro L / Stevens-Hernandez, Christian J / Cogan, Nicola M / Gyorffy, Gyongyver / Kupzig, Sabine / Nichols, Luned / Asby, Claire / Pooley, Jennifer / Ruffino, Gabriella / Hosseini, Faroakh / Moghaddas, Fiona / Attwood, Marie / Noel, Alan / Cooper, Alex / Arnold, David T / Hamilton, Fergus / Hyams, Catherine /
    Finn, Adam / Toye, Ashley M / Anstee, David J

    EJHaem

    2021  Volume 2, Issue 2, Page(s) 175–187

    Abstract: The SARS-CoV-2 virus causes COVID-19, an infection capable of causing severe disease and death but which can also be asymptomatic or oligosymptomatic. We investigated whether ABO blood group or secretor status was associated with COVID-19 severity. We ... ...

    Abstract The SARS-CoV-2 virus causes COVID-19, an infection capable of causing severe disease and death but which can also be asymptomatic or oligosymptomatic. We investigated whether ABO blood group or secretor status was associated with COVID-19 severity. We investigated secretor status because expression of ABO glycans on secreted proteins and non-erythroid cells are controlled by a fucosyltransferase (FUT2), and inactivating FUT2 mutations result in a non-secretor phenotype which protects against some viral infections. Data combined from healthcare records and our own laboratory tests (
    Language English
    Publishing date 2021-04-02
    Publishing country United States
    Document type Journal Article
    ISSN 2688-6146
    ISSN (online) 2688-6146
    DOI 10.1002/jha2.180
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: The ins and outs of reticulocyte maturation revisited: The role of autophagy in sickle cell disease.

    Mankelow, Tosti J / Griffiths, Rebecca E / Trompeter, Sara / Flatt, Joanna F / Cogan, Nicola M / Massey, Edwin J / Anstee, David J

    Autophagy

    2016  Volume 12, Issue 3, Page(s) 590–591

    Abstract: Autophagy plays an important role in the removal of membrane bound organelles during the last stage of erythropoiesis as the enucleate reticulocyte matures into the erythrocyte. Autophagic vesicles are expelled from the reticulocyte as intact, inside-out, ...

    Abstract Autophagy plays an important role in the removal of membrane bound organelles during the last stage of erythropoiesis as the enucleate reticulocyte matures into the erythrocyte. Autophagic vesicles are expelled from the reticulocyte as intact, inside-out, phosphatidylserine (PS) decorated vesicles and are subsequently removed during splenic passage. Failure to remove these vesicles causes the elevation in PS exposed red cells in Sickle Cell Disease.
    MeSH term(s) Anemia, Sickle Cell/pathology ; Autophagy ; Cell Differentiation ; Cytoplasmic Vesicles/metabolism ; Humans ; Models, Biological ; Reticulocytes/cytology
    Language English
    Publishing date 2016
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2454135-7
    ISSN 1554-8635 ; 1554-8627
    ISSN (online) 1554-8635
    ISSN 1554-8627
    DOI 10.1080/15548627.2015.1125072
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Non-muscle myosin II drives vesicle loss during human reticulocyte maturation.

    Moura, Pedro L / Hawley, Bethan R / Mankelow, Tosti J / Griffiths, Rebecca E / Dobbe, Johannes G G / Streekstra, Geert J / Anstee, David J / Satchwell, Timothy J / Toye, Ashley M

    Haematologica

    2018  Volume 103, Issue 12, Page(s) 1997–2007

    Abstract: The process of maturation of reticulocytes into fully mature erythrocytes that occurs in the circulation is known to be characterized by a complex interplay between loss of cell surface area and volume, removal of remnant cell organelles and redundant ... ...

    Abstract The process of maturation of reticulocytes into fully mature erythrocytes that occurs in the circulation is known to be characterized by a complex interplay between loss of cell surface area and volume, removal of remnant cell organelles and redundant proteins, and highly selective membrane and cytoskeletal remodeling. However, the mechanisms that underlie and drive these maturational processes
    MeSH term(s) Cell Differentiation ; Cells, Cultured ; Cytoplasmic Vesicles/metabolism ; Cytoskeletal Proteins/metabolism ; Erythrocytes/cytology ; Erythrocytes/metabolism ; Erythropoiesis ; Humans ; Molecular Motor Proteins/metabolism ; Myosin Heavy Chains/metabolism ; Myosin Type II/metabolism ; Phosphorylation ; Proteomics/methods ; Reticulocytes/cytology ; Reticulocytes/metabolism
    Chemical Substances Cytoskeletal Proteins ; MYH9 protein, human ; Molecular Motor Proteins ; Myosin Type II (EC 3.6.1.-) ; Myosin Heavy Chains (EC 3.6.4.1)
    Language English
    Publishing date 2018-08-03
    Publishing country Italy
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2333-4
    ISSN 1592-8721 ; 0017-6567 ; 0390-6078
    ISSN (online) 1592-8721
    ISSN 0017-6567 ; 0390-6078
    DOI 10.3324/haematol.2018.199083
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Autophagic vesicles on mature human reticulocytes explain phosphatidylserine-positive red cells in sickle cell disease.

    Mankelow, Tosti J / Griffiths, Rebecca E / Trompeter, Sara / Flatt, Joanna F / Cogan, Nicola M / Massey, Edwin J / Anstee, David J

    Blood

    2015  Volume 126, Issue 15, Page(s) 1831–1834

    Abstract: During maturation to an erythrocyte, a reticulocyte must eliminate any residual organelles and reduce its surface area and volume. Here we show this involves a novel process whereby large, intact, inside-out phosphatidylserine (PS)-exposed autophagic ... ...

    Abstract During maturation to an erythrocyte, a reticulocyte must eliminate any residual organelles and reduce its surface area and volume. Here we show this involves a novel process whereby large, intact, inside-out phosphatidylserine (PS)-exposed autophagic vesicles are extruded. Cell surface PS is a well-characterized apoptotic signal initiating phagocytosis. In peripheral blood from patients after splenectomy or in patients with sickle cell disease (SCD), the number of circulating red cells exposing PS on their surface is elevated. We show that in these patients PS is present on the cell surface of red cells in large (∼1.4 µm) discrete areas corresponding to autophagic vesicles. The autophagic vesicles found on reticulocytes are identical to those observed on red cells from splenectomized individuals and patients with SCD. Our data suggest the increased thrombotic risk associated with splenectomy, and patients with hemoglobinopathies is a possible consequence of increased levels of circulating mature reticulocytes expressing inside-out PS-exposed autophagic vesicles because of asplenia.
    MeSH term(s) Anemia, Sickle Cell/blood ; Anemia, Sickle Cell/pathology ; Autophagy ; Blotting, Western ; Case-Control Studies ; Cell Proliferation ; Cells, Cultured ; Erythrocytes/metabolism ; Erythrocytes/pathology ; Flow Cytometry ; Glycophorins/metabolism ; Humans ; Image Processing, Computer-Assisted ; Phagocytosis ; Phosphatidylserines/chemistry ; Phosphatidylserines/metabolism ; Reticulocytes/metabolism ; Reticulocytes/pathology ; Splenectomy
    Chemical Substances Glycophorins ; Phosphatidylserines
    Language English
    Publishing date 2015-08-14
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80069-7
    ISSN 1528-0020 ; 0006-4971
    ISSN (online) 1528-0020
    ISSN 0006-4971
    DOI 10.1182/blood-2015-04-637702
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Tetraspanins CD81 and CD82 facilitate α4β1-mediated adhesion of human erythroblasts to vascular cell adhesion molecule-1.

    Spring, Frances A / Griffiths, Rebecca E / Mankelow, Tosti J / Agnew, Christopher / Parsons, Stephen F / Chasis, Joel A / Anstee, David J

    PloS one

    2013  Volume 8, Issue 5, Page(s) e62654

    Abstract: The proliferation and terminal differentiation of erythroid progenitors occurs in human bone marrow within erythroblastic islands, specialised structures consisting of a central macrophage surrounded by developing erythroid cells. Many cell-cell and cell- ...

    Abstract The proliferation and terminal differentiation of erythroid progenitors occurs in human bone marrow within erythroblastic islands, specialised structures consisting of a central macrophage surrounded by developing erythroid cells. Many cell-cell and cell-matrix adhesive interactions maintain and regulate the co-ordinated daily production of reticulocytes. Erythroid cells express only one integrin, α4β1, throughout differentiation, and its interactions with both macrophage Vascular Cell Adhesion Molecule-1 and with extracellular matrix fibronectin are critical for erythropoiesis. We observed that proerythroblasts expressed a broad tetraspanin phenotype, and investigated whether any tetraspanin could modulate integrin function. A specific association between α4β1 and CD81, CD82 and CD151 was demonstrated by confocal microscopy and co-immune precipitation. We observed that antibodies to CD81 and CD82 augmented adhesion of proerythroblasts to Vascular Cell Adhesion Molecule-1 but not to the fibronectin spliceoforms FnIII12-IIICS-15 and FnIII12-15. In contrast, different anti-CD151 antibodies augmented or inhibited adhesion of proerythroblasts to Vascular Cell Adhesion Molecule-1 and the fibronectin spliceoform FnIII12-IIICS-15 but not to FnIII12-15. These results strongly suggest that tetraspanins have a functional role in terminal erythropoiesis by modulating interactions of erythroblast α4β1 with both macrophages and extracellular matrix.
    MeSH term(s) Antibodies/pharmacology ; Basophils/cytology ; Cell Adhesion/drug effects ; Cell Differentiation/drug effects ; Cell Line ; Epitopes/immunology ; Erythroblasts/cytology ; Erythroblasts/metabolism ; Erythropoiesis/drug effects ; Fibronectins/metabolism ; Flow Cytometry ; Humans ; Immunoprecipitation ; Integrin alpha4beta1/metabolism ; Kangai-1 Protein/metabolism ; Ligands ; Microscopy, Confocal ; Platelet Glycoprotein GPIIb-IIIa Complex/metabolism ; Protein Transport/drug effects ; Reticulocytes/cytology ; Reticulocytes/drug effects ; Reticulocytes/metabolism ; Tetraspanin 24/metabolism ; Tetraspanin 28/metabolism ; Vascular Cell Adhesion Molecule-1/metabolism
    Chemical Substances Antibodies ; CD151 protein, human ; CD81 protein, human ; CD82 protein, human ; Epitopes ; Fibronectins ; Integrin alpha4beta1 ; Kangai-1 Protein ; Ligands ; Platelet Glycoprotein GPIIb-IIIa Complex ; Tetraspanin 24 ; Tetraspanin 28 ; Vascular Cell Adhesion Molecule-1
    Language English
    Publishing date 2013-05-21
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0062654
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Tetraspanins CD81 and CD82 facilitate α4β1-mediated adhesion of human erythroblasts to vascular cell adhesion molecule-1.

    Frances A Spring / Rebecca E Griffiths / Tosti J Mankelow / Christopher Agnew / Stephen F Parsons / Joel A Chasis / David J Anstee

    PLoS ONE, Vol 8, Iss 5, p e

    2013  Volume 62654

    Abstract: The proliferation and terminal differentiation of erythroid progenitors occurs in human bone marrow within erythroblastic islands, specialised structures consisting of a central macrophage surrounded by developing erythroid cells. Many cell-cell and cell- ...

    Abstract The proliferation and terminal differentiation of erythroid progenitors occurs in human bone marrow within erythroblastic islands, specialised structures consisting of a central macrophage surrounded by developing erythroid cells. Many cell-cell and cell-matrix adhesive interactions maintain and regulate the co-ordinated daily production of reticulocytes. Erythroid cells express only one integrin, α4β1, throughout differentiation, and its interactions with both macrophage Vascular Cell Adhesion Molecule-1 and with extracellular matrix fibronectin are critical for erythropoiesis. We observed that proerythroblasts expressed a broad tetraspanin phenotype, and investigated whether any tetraspanin could modulate integrin function. A specific association between α4β1 and CD81, CD82 and CD151 was demonstrated by confocal microscopy and co-immune precipitation. We observed that antibodies to CD81 and CD82 augmented adhesion of proerythroblasts to Vascular Cell Adhesion Molecule-1 but not to the fibronectin spliceoforms FnIII12-IIICS-15 and FnIII12-15. In contrast, different anti-CD151 antibodies augmented or inhibited adhesion of proerythroblasts to Vascular Cell Adhesion Molecule-1 and the fibronectin spliceoform FnIII12-IIICS-15 but not to FnIII12-15. These results strongly suggest that tetraspanins have a functional role in terminal erythropoiesis by modulating interactions of erythroblast α4β1 with both macrophages and extracellular matrix.
    Keywords Medicine ; R ; Science ; Q
    Subject code 571
    Language English
    Publishing date 2013-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: Investigation of the contribution of histidine 119 to the conduction of protons through human Nox2.

    Mankelow, Tosti J / Hu, X Wen / Adams, Kate / Henderson, Lydia M

    European journal of biochemistry

    2004  Volume 271, Issue 20, Page(s) 4026–4033

    Abstract: The conduction of protons through human Nox2 has previously been shown to be dependent upon His115. Alignment of sequences for both animal and plant Nox proteins indicated that histidines 115 and 119 are both highly conserved, while His111 was conserved ... ...

    Abstract The conduction of protons through human Nox2 has previously been shown to be dependent upon His115. Alignment of sequences for both animal and plant Nox proteins indicated that histidines 115 and 119 are both highly conserved, while His111 was conserved among animal homologues of Nox1-4. To investigate the possible role that these histidine residues might play in the conduction of protons through Nox2, we have introduced both paired and single mutations into these histidine residues. Each construct was used to generate a CHO cell line in which the expression of the mutated Nox2 was assessed. Nox2 was expressed in each of the CHO cell lines generated, however, the level of expression of H111/115L in CHO cells was lower and that of H111L very much reduced, compared to that of wild-type Nox2. The arachidonic acid activated proton flux was absent in the CHO cell lines expressing the mutations of H111/115L, H111/119L or H115/119L, compared to that observed for wild-type Nox2. Similarly only a small efflux of protons was observed from CHO cells expressing either H119L or H111L. In all cases the expected proton flux was elicited through the addition of the protonophore, carbonyl cyanide m-chlorophenylhydrazone. Conclusions regarding the role of His111 in the conduction of protons cannot be drawn due to the reduced expression. We can, however, conclude that His119, in addition to His115, is required for the conduction of protons through Nox2. His119 has been identified as a highly conserved residue for which no function has previously been proposed.
    MeSH term(s) Amino Acid Sequence ; Amino Acid Substitution ; Animals ; Arachidonic Acid/pharmacology ; CHO Cells ; Cattle ; Cricetinae ; Cricetulus ; Histidine/genetics ; Histidine/metabolism ; Humans ; Membrane Glycoproteins/drug effects ; Membrane Glycoproteins/genetics ; Membrane Glycoproteins/metabolism ; Membrane Potentials/drug effects ; Membrane Potentials/physiology ; Membrane Proteins/genetics ; Mice ; Molecular Sequence Data ; Mutagenesis ; NADPH Oxidase 2 ; NADPH Oxidases/drug effects ; NADPH Oxidases/genetics ; NADPH Oxidases/metabolism ; Protein Structure, Tertiary ; Proton Pumps/drug effects ; Proton Pumps/genetics ; Proton Pumps/metabolism ; Rabbits ; Rats ; Recombinant Proteins/genetics ; Recombinant Proteins/metabolism ; Sequence Alignment ; Structure-Activity Relationship
    Chemical Substances Membrane Glycoproteins ; Membrane Proteins ; Proton Pumps ; Recombinant Proteins ; Arachidonic Acid (27YG812J1I) ; Histidine (4QD397987E) ; CYBB protein, human (EC 1.6.3.-) ; NADPH Oxidase 2 (EC 1.6.3.-) ; NADPH Oxidases (EC 1.6.3.-)
    Language English
    Publishing date 2004-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3032-6
    ISSN 1432-1033 ; 0014-2956
    ISSN (online) 1432-1033
    ISSN 0014-2956
    DOI 10.1111/j.1432-1033.2004.04340.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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