Roman Covarrubias1, Elena Chepurko1, Adam Reynolds1, Zachary M Huttinger1, Ryan Huttinger1, Katherine Stanfill1, Debra G Wheeler1, Tatiana Novitskaya1, Simon C Robson1, Karen M Dwyer1, Peter J Cowan1, Richard J Gumina2. 1. From the Division of Cardiovascular Medicine, Department of Medicine (R.C., E.C., T.N., R.J.G.), Department of Pharmacology (R.J.G.), and Department of Pathology Microbiology and Immunology (R.J.G.), Vanderbilt University, Nashville, TN; Division of Cardiovascular Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus (A.R., Z.M.H., R.H., K.S., D.G.W.); Transplant Institute, Department of Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA (S.C.R.); School of Medicine, Deakin University (K.M.D., P.J.C.); Immunology Research Centre, St. Vincent's Hospital (K.M.D.); and Department of Medicine, University of Melbourne, Victoria, Australia (K.M.D., P.J.C.). 2. From the Division of Cardiovascular Medicine, Department of Medicine (R.C., E.C., T.N., R.J.G.), Department of Pharmacology (R.J.G.), and Department of Pathology Microbiology and Immunology (R.J.G.), Vanderbilt University, Nashville, TN; Division of Cardiovascular Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus (A.R., Z.M.H., R.H., K.S., D.G.W.); Transplant Institute, Department of Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA (S.C.R.); School of Medicine, Deakin University (K.M.D., P.J.C.); Immunology Research Centre, St. Vincent's Hospital (K.M.D.); and Department of Medicine, University of Melbourne, Victoria, Australia (K.M.D., P.J.C.). richard.gumina@vanderbilt.edu.
Abstract
OBJECTIVE: Circulating blood cells and endothelial cells express ectonucleoside triphosphate diphosphohydrolase-1 (CD39) and ecto-5'-nucleotidase (CD73). CD39 hydrolyzes extracellular ATP or ADP to AMP. CD73 hydrolyzes AMP to adenosine. The goal of this study was to examine the interplay between CD39 and CD73 cascade in arterial thrombosis. APPROACH AND RESULTS: To determine how CD73 activity influences in vivo thrombosis, the time to ferric chloride-induced arterial thrombosis was measured in CD73-null mice. In response to 5% FeCl3, but not to 10% FeCl3, there was a significant decrease in the time to thrombosis in CD73-null mice compared with wild-type mice. In mice overexpressing CD39, ablation of CD73 did not inhibit the prolongation in the time to thrombosis conveyed by CD39 overexpression. However, the CD73 inhibitor α-β-methylene-ADP nullified the prolongation in the time to thrombosis in human CD39 transgenic (hC39-Tg)/CD73-null mice. To determine whether hematopoietic-derived cells or endothelial cell CD39 activity regulates in vivo arterial thrombus, bone marrow transplant studies were conducted. FeCl3-induced arterial thrombosis in chimeric mice revealed a significant prolongation in the time to thrombosis in hCD39-Tg reconstituted wild-type mice, but not on wild-type reconstituted hCD39-Tg mice. Monocyte depletion with clodronate-loaded liposomes normalized the time to thrombosis in hCD39-Tg mice compared with hCD39-Tg mice treated with control liposomes, demonstrating that increased CD39 expression on monocytes protects against thrombosis. CONCLUSIONS: These data demonstrate that ablation of CD73 minimally effects in vivo thrombosis, but increased CD39 expression on hematopoietic-derived cells, especially monocytes, attenuates in vivo arterial thrombosis.
OBJECTIVE: Circulating blood cells and endothelial cells express ectonucleoside triphosphate diphosphohydrolase-1 (CD39) and ecto-5'-nucleotidase (CD73). CD39 hydrolyzes extracellular ATP or ADP to AMP. CD73 hydrolyzes AMP to adenosine. The goal of this study was to examine the interplay between CD39 and CD73 cascade in arterial thrombosis. APPROACH AND RESULTS: To determine how CD73 activity influences in vivo thrombosis, the time to ferric chloride-induced arterial thrombosis was measured in CD73-null mice. In response to 5% FeCl3, but not to 10% FeCl3, there was a significant decrease in the time to thrombosis in CD73-null mice compared with wild-type mice. In mice overexpressing CD39, ablation of CD73 did not inhibit the prolongation in the time to thrombosis conveyed by CD39 overexpression. However, the CD73 inhibitor α-β-methylene-ADP nullified the prolongation in the time to thrombosis in humanCD39 transgenic (hC39-Tg)/CD73-null mice. To determine whether hematopoietic-derived cells or endothelial cell CD39 activity regulates in vivo arterial thrombus, bone marrow transplant studies were conducted. FeCl3-induced arterial thrombosis in chimeric mice revealed a significant prolongation in the time to thrombosis in hCD39-Tg reconstituted wild-type mice, but not on wild-type reconstituted hCD39-Tgmice. Monocyte depletion with clodronate-loaded liposomes normalized the time to thrombosis in hCD39-Tgmice compared with hCD39-Tgmice treated with control liposomes, demonstrating that increased CD39 expression on monocytes protects against thrombosis. CONCLUSIONS: These data demonstrate that ablation of CD73 minimally effects in vivo thrombosis, but increased CD39 expression on hematopoietic-derived cells, especially monocytes, attenuates in vivo arterial thrombosis.
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