Trends in Pharmacological Sciences
Nitrosative stress and pharmacological modulation of heart failure
Section snippets
Role of increased oxidative stress in heart failure
Acute heart failure and chronic heart failure (CHF) are major causes of hospitalization, morbidity and mortality worldwide. Several different mechanisms can lead to cardiac pump failure (Figure 1). These mechanisms result in a mismatch between the load applied to the heart and the energy needed for contraction, which leads to reduced contractile efficiency (Figure 1).
The pathomechanism of heart failure is complex and involves the activation of numerous secondary pathways (e.g. pathways
Role of increased nitrosative stress and dysregulation of nitric oxide synthase in heart failure
Cardiomyocytes, endocardial endothelium, coronary endothelium and cardiac nerves are all sources of nitric oxide (NO) produced by Ca2+-dependent NO synthase (NOS) enzymes. NO serves several important physiological roles in the regulation of cardiac function, including coronary vasodilatation, inhibition of platelet and neutrophil adhesion and activation, modulation of cardiac contractile function, and inhibition of cardiac oxygen consumption (reviewed in 4, 5, 6).
NO is necessary for normal
Mechanisms of peroxynitrite-induced cardiac and vascular dysfunction
There are multiple possible downstream targets of peroxynitrite (Table 1, Figure 2) (reviewed in 8, 9, 14). For example, peroxynitrite-induced tyrosine nitration can lead to dysfunctional nitrated proteins whereas peroxynitrite-induced oxidation of crucial sulfydryl groups can inhibit important enzymes in the mitochondrial respiratory chain. Indeed, peroxynitrite-mediated nitration of myofibrillar creatine kinase impairs myocardial contractility [10]. Furthermore, peroxynitrite-modified
Role of peroxynitrite-induced activation of matrix metalloproteinases
MMPs are a family of proteolytic enzymes that are best known for their ability to degrade and remodel the extracellular matrix. MMPs are now also recognized to have a variety of novel actions as proteases on substrates other than extracellular matrix proteins. They have important roles both under physiological (e.g. angiogenesis and remodeling of the endometrium) and pathophysiological (e.g. neutrophil infiltration, cancer cell invasion and connective tissue remodeling) conditions. In the
Role of poly(ADP-ribose) polymerase (PARP) activation
Poly(ADP-ribose) polymerase 1 (PARP-1) is the major isoform of a family of nuclear enzymes with multiple regulatory functions. PARP cleaves NAD+ to nicotinamide and ADP-ribose to form long branches of ADP-ribose polymers on nuclear target proteins. PARP activation exerts its pathophysiological effects via two principal mechanisms (reviewed in [35]). First, when PARP is activated by single-strand breaks in DNA, it catalyzes the cleavage of NAD+ into nicotinamide. As a result, in oxidatively or
Possibilities for future pharmacological interventions for the experimental therapy of heart failure
Although there is strong experimental evidence for the role of ROS and reactive nitrogen species in the development of the structural and functional changes of the failing myocardium, the results of clinical trials with antioxidants such as vitamin C, vitamin E and coenzyme Q10 are equivocal [1]. The reason for these findings might be related to the type of antioxidant used (relatively low reaction rate with the reactive species or non-catalytic antioxidant) and the dose of the antioxidant used
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