Abstract
Heme oxygenase (HO) breaks down heme, the iron-containing, oxygen-carrying constituent of red blood cells, yielding biliverdin, iron (II) ions, and carbon monoxide (CO). Among the isoenzymes cloned to date, only HO-1 can be induced by a panoply of stimuli linked by their ability to provoke oxidative stress. HO-1 induction protects against cell death in experimental models associated with ischemia/reperfusion or inflammation, making the gene a promising target for critical care medicine. Induction of HO-1 may confer protection by controlling intracellular levels of toxic heme, or by anti-inflammatory, anti-apoptotic, and blood flow-maintaining effects of its by-products biliverdin and CO. Although protective effects of upregulation of HO-1 have been reported for a variety of cells and tissues, evidence suggests that the protective action may be restricted to a rather narrow threshold of overexpression. In addition, there is substantial variation in gene expression depending on transcriptional control mechanisms such as a microsatellite length polymorphism. Genetic variability and the required use of cytotoxic inducers are hurdles for purposeful targeting of HO-1 gene expression in critical care, while administration of by-products of the pathway seems feasible at present.
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Notes
The HGNC approved gene symbols for the two isoenzymes are HMOX1 (alias HO-1 and bK286B10) and HMOX2 (alias HO-2) respectively, thus we use HO-1 and HO-2 for convenience throughout the manuscript.
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Bauer, M., Huse, K., Settmacher, U. et al. The heme oxygenase – carbon monoxide system: regulation and role in stress response and organ failure. Intensive Care Med 34, 640–648 (2008). https://doi.org/10.1007/s00134-008-1010-2
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DOI: https://doi.org/10.1007/s00134-008-1010-2