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Computational Analysis Of Nitric Oxide Biotransport To Red Blood Cell In The Presence Of Free Hemoglobin And NO Donor.

P. Deonikar, H. Abu-Soud, M. Kavdia
Published 2014 · Chemistry, Medicine

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Red blood cells (RBCs) modulate nitric oxide (NO) bioavailability in the vasculature. Extracellular free hemoglobin (Hb) in the vascular lumen can cause NO bioavailability related complications seen in pathological conditions such as pancreatitis, sickle cell disease and malaria. In addition, the role of extracellular free Hb has been critical to estimate kinetic and transport properties of NO-RBCs interactions in 'competition experiments'. We recently reported a strong dependence of NO transport on RBC membrane permeability and hematocrit. NO donors combined with anti-inflammatory drugs are an emergent treatment for diseases like cancer, cardiovascular complications and wound healing. However, the role of RBCs in transport NO from NO donors is not clearly understood. To understand the significance of extracellular free Hb in pathophysiology on NO availability and estimation of the NO-RBC interactions, we developed a computational model to simulate NO biotransport to the RBC in the presence of extracellular free Hb. Using this model, we studied the effect of hematocrit, RBC membrane permeability and NO donors on NO-RBC interactions in the presence and absence of extracellular free Hb. The plasma NO concentration gradients and average plasma NO concentrations changed minimally with increase in extracellular free Hb concentrations at the higher hematocrit as compared to those at the lower hematocrit irrespective of the NO delivery method, indicating that the presence of extracellular free Hb affects the NO transport only at a low hematocrit. We also observed that NO concentrations increased with NO donor concentrations in the absence as well as in the presence of extracellular free Hb. In addition, NO donor supplementation may increase NO availability in the plasma in the event of loss of endothelium-derived NO activity.
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