Abstract
Accumulating evidence indicates that antioxidant and/or stress response genes play a critical, cytoprotective role in the systemic and pulmonary vasculature. One of these genes is heme oxygenase-1 (HO-1). HO-1 is a microsomal enzyme that is ubiquitously distributed and strongly induced by several stressors, including oxidative, environmental, and hemodynamic stresses. HO-1 catalyzes the oxidative degradation of free heme to biliverdin (BV), free iron, and carbon monoxide (CO). BV is reduced to bilirubin (BR), a potent endogenous antioxidant with potential anti-inflammatory properties, whereas iron is sequestered by ferritin, leading to additional antioxidant and antiapoptotic effects. CO is a gaseous molecule with increasingly recognized biological properties, including anti-inflammatory effects, vasodilation, and neurotransmission in the central and peripheral nervous systems. It shares many similarities with nitric oxide (NO) as an activator of soluble guanylyl cyclase, leading to an increase in cyclic GMP (cGMP) levels and causing vasodilation. Like NO, CO is an inhibitor of platelet aggregation and smooth muscle cell proliferation. These properties of HO-1 and its enzymatic products make it a suitable candidate to orchestrate regulatory functions in the lung and to potentially be a key mediator of the pathways underlying the control of lung vascular homeostasis. This chapter focuses on the protective effects of HO-1 and its products, CO and BR, in pulmonary hypertension and in the maintenance of cardiovascular function.
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Kourembanas, S. (2011). Carbon Monoxide and Heme Oxygenase in the Regulation of Pulmonary Vascular Function and Structure. In: Yuan, JJ., Garcia, J., West, J., Hales, C., Rich, S., Archer, S. (eds) Textbook of Pulmonary Vascular Disease. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-87429-6_53
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