Urine
As such, it nitrosylates the haem-moiety of guanylate cyclase, thereby stimulating formation of cyclic guanine monophosphate (cGMP), which then initiates calcium-dependent vasodilation (Olson et al, 2004). PubMed:25307023
NO inhibits platelet aggregation mediated by guanylate cyclase activation with a subsequent rise in cGMP (Faint et al, 1991). PubMed:25307023
Platelet deposition and adhesion at sites of subintimal injury are increased by free haemoglobin or inhibition of NO production; this effect can be prevented by infusions of L-arginine, the precursor of NO (Olsen et al, 1996). PubMed:25307023
Furthermore, cytokine secretion depends on the coordinated iron in the porphyrin ring (Figueiredo et al, 2007), and nuclear factor-jB (NF-jB), MAPKs activation and ROS are essential for the increase in cytokine production induced by haem (Fernandez et al, 2010). PubMed:25307023
Thus, by participating in Fenton chemistry, non-transferrin-bound iron (i.e., iron not bound to the physiological iron transport protein, transferrin) causes oxidative damage, cytotoxicity and enhanced endothelial expression of adhesion molecules, thereby enhancing thrombotic risk (Hershko, 2007). PubMed:25307023
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If you find BEL Commons useful in your work, please consider citing: Hoyt, C. T., Domingo-Fernández, D., & Hofmann-Apitius, M. (2018). BEL Commons: an environment for exploration and analysis of networks encoded in Biological Expression Language. Database, 2018(3), 1–11.