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Front Pharmacol. 2017 Apr 04;8:146. doi: 10.3389/fphar.2017.00146. eCollection 2017.

Heme as a Target for Therapeutic Interventions.

Frontiers in pharmacology

Stephan Immenschuh, Vijith Vijayan, Sabina Janciauskiene, Faikah Gueler

Affiliations

  1. Institute for Transfusion Medicine, Hannover Medical SchoolHannover, Germany.
  2. Department of Pulmonology, Hannover Medical SchoolHannover, Germany.
  3. Department of Nephrology, Hannover Medical SchoolHannover, Germany.

PMID: 28420988 PMCID: PMC5378770 DOI: 10.3389/fphar.2017.00146

Abstract

Heme is a complex of iron and the tetrapyrrole protoporphyrin IX with essential functions in aerobic organisms. Heme is the prosthetic group of hemoproteins such as hemoglobin and myoglobin, which are crucial for reversible oxygen binding and transport. By contrast, high levels of free heme, which may occur in various pathophysiological conditions, are toxic via pro-oxidant, pro-inflammatory and cytotoxic effects. The toxicity of heme plays a major role for the pathogenesis of prototypical hemolytic disorders including sickle cell disease and malaria. Moreover, there is increasing appreciation that detrimental effects of heme may also be critically involved in diseases, which usually are not associated with hemolysis such as severe sepsis and atherosclerosis. In mammalians homeostasis of heme and its potential toxicity are primarily controlled by two physiological systems. First, the scavenger protein hemopexin (Hx) non-covalently binds extracellular free heme with high affinity and attenuates toxicity of heme in plasma. Second, heme oxygenases (HOs), in particular the inducible HO isozyme, HO-1, can provide antioxidant cytoprotection via enzymatic degradation of intracellular heme. This review summarizes current knowledge on the pathophysiological role of heme for various diseases as demonstrated in experimental animal models and in humans. The functional significance of Hx and HOs for the regulation of heme homeostasis is highlighted. Finally, the therapeutic potential of pharmacological strategies that apply Hx and HO-1 in various clinical settings is discussed.

Keywords: heme; heme oxygenases; heme toxicity; hemolysis; hemopexin; inflammation; inflammatory diseases

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