Erythrocyte deformability is a biorheological influent factor on blood viscosity, cellular oxygenation and a biomarker of acute and chronic inflammation. An inverse relationship between erythrocyte ability to reversibly change its shape with nitric oxide (NO) efflux from erythrocytes was reported in patients with hypercholesterolemia, hypertension and renal transplant. Erythrocyte NO efflux is negatively associated with carotid intima-media thickness and an independent predictor of this structural anomaly. High concentrations of oxidized LDL when in presence of healthy human erythrocytes increase its ability to scavenge NO.The aim of this work was to evaluate in vitro, the effects on erythrocyte nitric oxide (NO) metabolism and its deformability under presence of lipoproteins LDL / HDL.Aliquots of healthy human blood samples were enriched, or not (control), with synthetic LDL/HDL solutions ([LDL/HDL] 1 =18.44/0.776 mg/dL and [LDL/ HDL] 2 =36.88/1.552 mg/dL). NO efflux from erythrocyte and its content on nitrite, nitrate, S-nitrosoglutathione (GSNO), peroxynitrite and its deformability (EEI) were determined. So, from each blood sample three aliquots were made: the control and two different LDL/HDL concentrations.In the present study, were not observed variations on peroxynitrite levels inside erythrocytes, on the ability to scavenge NO and on EEI at all shear stress when compared to the values obtained in untreated samples. NO mobilization inside erythrocytes of the treated aliquots were showed by the significantly increased of nitrite, nitrate and S-nitrosoglutathione levels in relation to the control aliquots without significant differences between both treated aliquots.In this in vitro study with erythrocytes obtained from blood samples of healthy human we show that under LDL/HDL addition, maintenance of its membrane deformability, nitric oxide and the nitrogen redox level content. All these results evidence the ability of erythrocytes to answer LDL/HDL binding by increasing NO mobilization with higher nitrite, nitrate and GSNO concentrations. Better understanding of the signal transduction mechanism associated to the erythrocytes binding LDL/HDL receptors may bring potential targets in cases of diminished erythrocyte deformability or impeachment delivery of nitric oxide to alleviate the compromised microcirculation.

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