Nitric oxide scavenging by red blood cell microparticles and cell-free hemoglobin as a mechanism for the red cell storage lesion.
نویسندگان
چکیده
BACKGROUND Intravascular red cell hemolysis impairs nitric oxide (NO)-redox homeostasis, producing endothelial dysfunction, platelet activation, and vasculopathy. Red blood cell storage under standard conditions results in reduced integrity of the erythrocyte membrane, with formation of exocytic microvesicles or microparticles and hemolysis, which we hypothesized could impair vascular function and contribute to the putative storage lesion of banked blood. METHODS AND RESULTS We now find that storage of human red blood cells under standard blood banking conditions results in the accumulation of cell-free and microparticle-encapsulated hemoglobin, which, despite 39 days of storage, remains in the reduced ferrous oxyhemoglobin redox state and stoichiometrically reacts with and scavenges the vasodilator NO. Using stopped-flow spectroscopy and laser-triggered NO release from a caged NO compound, we found that both free hemoglobin and microparticles react with NO about 1000 times faster than with intact erythrocytes. In complementary in vivo studies, we show that hemoglobin, even at concentrations below 10 μmol/L (in heme), produces potent vasoconstriction when infused into the rat circulation, whereas controlled infusions of methemoglobin and cyanomethemoglobin, which do not consume NO, have substantially reduced vasoconstrictor effects. Infusion of the plasma from stored human red blood cell units into the rat circulation produces significant vasoconstriction related to the magnitude of storage-related hemolysis. CONCLUSIONS The results of these studies suggest new mechanisms for endothelial injury and impaired vascular function associated with the most fundamental of storage lesions, hemolysis.
منابع مشابه
Letter by Lin et al regarding article, "Nitric oxide scavenging of red blood cell microparticles and cell-free hemoglobin as a mechanism for the red cell storage lesion".
متن کامل
Nitric oxide scavenging by red cell microparticles and cell free hemoglobin as a mechanism for hemolytic diseases and the red blood cell storage lesion
Intravascular red cell hemolysis impairs NO-redox homeostasis, producing endothelial dysfunction, platelet activation and vasculopathy. A central mechanism is that cell-free plasma hemoglobin reacts with the vasodilator nitric oxide (NO) in a 1:1 stoichiometric reaction that occurs at high rate of 6-8x107 mol/L/s. This consumption of NO by cell free plasma hemoglobin has been shown to cause cha...
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UNLABELLED The blood storage lesion involves morphological and biochemical changes of red blood cells (RBCs) that occur during storage. These include conversion of the biconcave disc morphology to a spherical one, decreased mean corpuscular hemoglobin concentration, varied mean corpuscular volume, reduced integrity of the erythrocyte membrane with formation of microparticles, and increased cell...
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12. Roback JD: Vascular effects of the red blood cell storage lesion. Hematology Am Soc Hematol Educ Program 2011; 2011:475–9 13. Donadee C, Raat NJ, Kanias T, Tejero J, Lee JS, Kelley EE, Zhao X, Liu C, Reynolds H, Azarov I, Frizzell S, Meyer EM, Donnenberg AD, Qu L, Triulzi D, Kim-Shapiro DB, Gladwin MT: Nitric oxide scavenging by red blood cell microparticles and cell-free hemoglobin as a me...
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ورودعنوان ژورنال:
- Circulation
دوره 124 4 شماره
صفحات -
تاریخ انتشار 2011