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  • Effects of nitrogen monoxide and carbon monoxide on molecular and cellular iron metabolism: mirror-image effector molecules that target iron
  • Watts RN; Ponka P; Richardson DR
  • Biochem J 2003[Feb]; 369 (Pt 3): 429-40
  • Many effector functions of nitrogen monoxide (NO) and carbon monoxide (CO) are mediated through their high-affinity for iron (Fe). In this review, the roles of NO and CO are examined in terms of their effects on the molecular and cellular mechanisms involved in Fe metabolism. Both NO and CO avidly form complexes with a plethora of Fe-containing molecules. The generation of NO and CO is mediated by the nitric oxide synthase and haem oxygenase (HO) families of enzymes respectively. The effects of NO on Fe metabolism have been well characterized, whereas knowledge of the effects of CO remains within its infancy. In terms of the role of NO in Fe metabolism, one of the best characterized interactions includes its effect on the iron regulatory proteins. These molecules are mRNA-binding proteins that control the expression of the transferrin receptor 1 and ferritin, molecules that are involved in Fe uptake and storage respectively. Apart from this, activated macrophages impart their cytotoxic activity by generating NO, which results in marked Fe mobilization from tumour-cell targets. This deprives the cell of the Fe that is required for DNA synthesis and energy production. Considering that HO degrades haem, resulting in the release of CO, Fe(II) and biliverdin, it is suggested that a CO-Fe complex will form. This may account for the rapid Fe mobilization observed from macrophages after haemoglobin catabolism. Intriguingly, overexpression of HO results in cellular Fe mobilization, suggesting that CO has a similar effect to NO on Fe trafficking. Preliminary evidence suggests that, like NO, CO plays important roles in Fe metabolism.
  • |Animals[MESH]
  • |Carbon Monoxide/*metabolism[MESH]
  • |Heme Oxygenase (Decyclizing)/metabolism[MESH]
  • |Heme Oxygenase-1[MESH]
  • |Humans[MESH]
  • |Iron/*metabolism[MESH]
  • |Membrane Proteins[MESH]
  • |Nitric Oxide Synthase/metabolism[MESH]
  • |Nitric Oxide/*metabolism[MESH]





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    *<b>[http://www.kidney.de/mlpefetch.php?search=12423201 Effects of nitrogen monoxide and carbon monoxide on molecular and cellular iron metabolism: mirror-image effector molecules that target iron ]</b> Biochem J 2003; 369(Pt 3) ; 429-40 Watts RN; Ponka P; Richardson DR

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    Biochem J

    429 Pt 3.369 2003