Necrotic platelets provide a procoagulant surface during thrombosis

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Necrotic platelets provide a procoagulant surface during thrombosis by Vu Minh Hua, Latasha Abeynaike, Elias Glaros, Heather Campbell, Leonardo Pasalic, Philip J. Hogg, and Vivien M. Y. Chen Blood Volume 126(26):2852-2862 December 24, 2015 ©2015 by American Society of Hematology

GSAO labels a subpopulation of activated platelets. GSAO labels a subpopulation of activated platelets. (A) Structure of GSAO and site of conjugation of AF647, Oregon Green, or biotin. (B) Washed human platelets were stimulated with calcium ionophore (1 µM) and activation and plasma membrane compromise measured by flow cytometry. Activated platelets were detected from surface elaboration of P-selectin and plasma membrane compromise by labeling with GSAO-AF647 or negative control GSCA-AF647. (C) Washed human platelets were left unstimulated or stimulated with thrombin (0.1 U/mL), collagen (5 µg/mL), or thrombin (0.1 U/mL) and collagen (5 µg/mL), and exposure of P-selectin and labeling with GSAO-AF647 were measured by flow cytometry. (D) Platelet stimulation with both thrombin and collagen results in significantly more labeling with GSAO-AF647 than with either agonist alone. (E) Washed human platelets were stimulated with collagen or collagen-related peptide, and labeling with GSAO-AF647 was measured by flow cytometry. Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology

GSAO rapidly enters the activated platelet subpopulation via an organic anion-transporting polypeptide. GSAO rapidly enters the activated platelet subpopulation via an organic anion-transporting polypeptide. (A) The kinetics of labeling of stimulated platelets with GSAO-AF647 was measured by time-lapse flow cytometry. Flow plots are representative of n ≥ 3 separate experiments, and bars and data points are from n ≥ 3 separate experiments. *P < .05; ****P < .0001. (B-C) Washed human platelets were stimulated with thrombin (0.1 U/mL) and collagen (5 µg/mL), incubated with 0 to 200 µM DIDS for 10 minutes, and then exposure of P-selectin and labeling with GSAO-AF647 were measured by flow cytometry. DIDS inhibited labeling of P-selectin+ activated platelets at a half-maximal concentration of ∼30 µM. The data points and errors are the mean ± range of 1 to 5 experiments. Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology

Labeling with GSAO and exposure of P-selectin distinguishes necrotic from apoptotic platelets. Labeling with GSAO and exposure of P-selectin distinguishes necrotic from apoptotic platelets. (A) Washed human platelets were incubated with 30 µM of the BH3 mimetic ABT-737 for 2 hours, and exposure of P-selectin and labeling with GSAO-AF647, control GSCA-AF647, polycaspase-FAM, or annexin V-PB were measured by flow cytometry. (B) Washed human platelets were incubated with increasing concentrations of ABT-737 for 2 hours, and labeling with GSAO-AF647 and exposure of P-selection were measured by flow cytometry. The percentage of GSAO+ platelets are graphed with respect to P-selectin exposure. (C) Washed human platelets were preincubated with 200 µM ZVADFMK or vehicle control for 15 minutes and then incubated with 30 µM ABT-737 for 2 hours (part F), or stimulated with thrombin (0.1 U/mL) and collagen (5 µg/mL) for 10 minutes (part G). Labeling with GSAO-AF647 and exposure of P-selection were measured by flow cytometry. (D) Washed human platelets from healthy donors (n = 5-11) were untreated or stimulated with thrombin (0.1 U/mL), collagen (5 µg/mL), or thrombin (0.1 U/mL) and collagen (5 µg/mL) for 10 min. Labeling with GSAO-AF647 and exposure of P-selection was measured by flow cytometry, and the results were expressed as GSAO+ platelets that are P-selectin− or P-selection+. The error bars are mean ± standard deviation. Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology

GSAO marks platelets undergoing cyclophilin D-dependent necrosis. GSAO marks platelets undergoing cyclophilin D-dependent necrosis. (A) Washed human platelets were untreated or stimulated with thrombin (0.1 U/mL) and collagen (5 µg/mL) or the mitochondrial membrane disrupter m-chlorophenylhydrazone (4 μM). Mitochondrial transmembrane potential was measured using the cationic dye, JC-1. The ratio of distribution of JC-1 between the mitochondria (red fluorescence) and cytosol (green fluorescence) reflects mitochondrial transmembrane potential. Results are representative of n ≥ 3 separate experiments. (B-C) The correlation between loss of platelet mitochondrial transmembrane potential (JC-1 loss of B585 fluorescence) or phosphatidylserine exposure (annexin V labeling) and labeling with GSAO-AF647 after collagen (5 µg/mL) or thrombin (0.1 U/mL) and collagen (5 µg/mL) stimulation was measured by time-lapse flow cytometry. (D) Washed human platelets were untreated or preincubated with the cyclophilin D inhibitor, cyclosporine A (CysA, 2 μM), for 15 minutes before stimulation with thrombin (0.1 U/mL) and collagen (5 µg/mL). Labeling with GSAO-AF647 was measured by flow cytometry and procoagulant potential assessed using the Calibrated Automated Thrombogram (n = 3-6; ****P < .0001). (E) Washed human platelets were preincubated with CaCl2 for 15 minutes and then untreated or stimulated with thrombin (0.1 U/mL) and collagen (5 µg/mL). Labeling with GSAO-AF647 was measured by flow cytometry (n = 8; *P < .05). Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology

GSAO+ platelets form in occluding murine thrombi and are attenuated with megakaryocyte-directed deletion of the cyclophilin D gene. GSAO+ platelets form in occluding murine thrombi and are attenuated with megakaryocyte-directed deletion of the cyclophilin D gene. (A-B) Dylight 649-conjugated antiplatelet CD42b antibody and GSAO-Oregon Green or control compound GSCA-Oregon green were injected into the murine circulation and thrombus initiated in the cremaster muscle arterioles by FeCl3 injury. Thrombi were captured by confocal intravital video microscopy, and images are displayed as 3-dimensional reconstructions (maximum intensity projection mode). Occlusive thrombi incorporate GSAO-Oregon green, but not the control compound. (C-E) Dylight 649-conjugated antiplatelet CD42b and GSAO-Oregon Green were injected into the murine circulation and thrombus initiated in the cremaster muscle arterioles by either laser (C) or FeCl3 (D) injury. Thrombi were captured by confocal intravital video microscopy and images displayed as cross-sectional orthogonal views for single-plane colocalization. There was minimal GSAO signal in the nonocclusive thrombus initiated by laser injury, but extensive signal in the occlusive thrombus initiated by FeCl3 injury (C; n = 6-8 in 6-8 different mice; Manders correlation coefficient, **P < .01). (F) Dylight 649-conjugated anti-platelet CD42b antibody, GSAO-AF546, and AF488-conjugated anti-fibrin antibody were injected into the murine circulation of wild-type (WT) or platelet-specific cyclophilin D-deficient (PF4Cre+ CypDFl/Fl) mice and thrombus initiated in the cremaster muscle arterioles by FeCl3 injury. Thrombi were captured by confocal intravital video microscopy and images analyzed for integrated GSAO, platelet, and fibrin fluorescence (WT n = 4, 29 thrombi; PF4Cre+ CypDFl/Fl n = 3, 15 thrombi; *P < .05; **P < .001). (G) Dylight 649-conjugated anti-platelet CD42b antibody, GSAO-Oregon Green, and calcium-sensing dye rhodamine 2 were injected into the murine circulation and thrombus initiated in the cremaster muscle arterioles by FeCl3 injury. Thrombus was visualized 10 minutes after injury. Images are represented as cross-sectional orthogonal views of single confocal plane displaying platelets and GSAO (left) with rhodamine signal (right). Persistence of high calcium signal is demonstrated in the GSAO+ platelets consistent with necrotic cell death. Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology

GSAO marks functionally procoagulant platelets. GSAO marks functionally procoagulant platelets. (A-B) Washed human platelets were stimulated with thrombin (0.1 U/mL) or thrombin (0.1 U/mL) and collagen (5 µg/mL), and phosphatidylserine externalization was assessed by annexin V binding. The mean fluorescence intensity of annexin V binding to GSAO− and GSAO+ platelets is shown in B. Flow plots and bars are representative of n ≥ 3 separate experiments. (C) Platelet-rich plasma was recalcified and stimulated with thrombin (1 U/mL) and collagen (5 µg/mL) with fibrin polymerization inhibition. FXa on the platelet surface was detected using the small molecule inhibitor, Glu-Gly-Arg chloromethyl ketone-fluorescein isothiocyanate. Of the FXa+ platelets, 93% were co-labeled with GSAO. (D) Washed human platelets were stimulated with thrombin (0.1 U/mL) or thrombin (0.1 U/mL) and collagen (5 µg/mL), and their procoagulant potential was assessed using the Calibrated Automated Thrombogram. Correlation between peak thrombin time and the percentage of GSAO+ platelets in the preparation (n = 18). The dotted line is the nonlinear least squares fit of the data to a single exponential (r2 = 0.77; P < .001). (E) Dylight 649-conjugated anti-platelet CD42b antibody, GSAO-AF546, and AF488-conjugated anti-fibrin antibody were injected into the murine circulation and thrombus initiated in the cremaster muscle arterioles by FeCl3 injury. Images are represented as cross-sectional orthogonal views of single confocal plane separately displaying GSAO and fibrin signal (left) and platelet signal (right). Fibrin signal preferentially localized with the GSAO+ platelets (representative image, n = 9 images in 3 independent mice). (F) 3D reconstruction of an occlusive thrombus. Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology

Aspirin ingestion sensitizes platelets to cyclophilin D inhibition in human subjects. Aspirin ingestion sensitizes platelets to cyclophilin D inhibition in human subjects. Platelets from healthy volunteers were examined before and after 7 days of aspirin ingestion. Washed platelets were activated with thrombin (0.1 U/mL) and collagen (5 µg/mL) and GSAO+/P-selectin+ necrotic platelets measured by flow cytometry (A) and procoagulant potential assessed using the Calibrated Automated Thrombogram (B). Aspirin ingestion resulted in no change in the GSAO+/P-selectin+ necrotic or procoagulant potential of activated platelets. CysA treatment of preaspirin platelets resulted in a decrease in GSAO+/P-selectin+ necrotic platelets (n = 5;* P < .05) and procoagulant function (n = 5; **P < .01), and this effect was more pronounced in the postaspirin platelets (n = 5; *P < .05). Vu Minh Hua et al. Blood 2015;126:2852-2862 ©2015 by American Society of Hematology