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lüll Nitric oxide in the cardiovascular system: a simple molecule with complex actions Strijdom H; Chamane N; Lochner ACardiovasc J Afr 2009[Sep]; 20 (5): 303-10Since it was identified as the elusive endothelium-derived relaxing factor (EDRF) in the 1980s, nitric oxide (NO) has rapidly gained status as one of the most important signalling molecules in the cardiovascular system. Now, 20 years later, NO is regarded by most to be a ubiquitous mediator of cardioprotection. However, due to various complex underlying cellular mechanisms, the actions of NO often seem to be contradictory. This article sheds light on some of the mechanisms that may influence the variable actions of NO in the heart. Its role in conditions of oxygen deprivation (ischaemia and hypoxia) in particular is relevant to basic scientists and clinicians alike, since the prevalence of ischaemic heart disease is on the rise (in both the developed and the developing worlds) and novel therapeutic options are in constant demand. NO is a promising candidate molecule that could find therapeutic application. For this to be achieved, a sound understanding of this simple molecule and its complex actions is required.|Animals[MESH]|Endothelium-Dependent Relaxing Factors/physiology[MESH]|Heart/*physiology[MESH]|Humans[MESH]|Myocardial Ischemia/physiopathology[MESH]|Nitric Oxide Synthase/physiology[MESH]|Nitric Oxide/*physiology[MESH] |