Abstract:
:Hereditary hemochromatosis and transfusional iron overload are frequent clinical conditions associated with progressive iron accumulation in parenchymal tissues, leading to eventual organ failure. We have discovered a new mechanism to reverse iron overload-pharmacological modulation of the divalent metal transporter-1 (DMT-1). DMT-1 mediates intracellular iron transport during the transferrin cycle and apical iron absorption in the duodenum. Its additional functions in iron handling in the kidney and liver are less well understood. We show that the L-type calcium channel blocker nifedipine increases DMT-1-mediated cellular iron transport 10- to 100-fold at concentrations between 1 and 100 microM. Mechanistically, nifedipine causes this effect by prolonging the iron-transporting activity of DMT-1. We show that nifedipine mobilizes iron from the liver of mice with primary and secondary iron overload and enhances urinary iron excretion. Modulation of DMT-1 function by L-type calcium channel blockers emerges as a new pharmacological therapy for the treatment of iron overload disorders.
journal_name
Nat Medjournal_title
Nature medicineauthors
Ludwiczek S,Theurl I,Muckenthaler MU,Jakab M,Mair SM,Theurl M,Kiss J,Paulmichl M,Hentze MW,Ritter M,Weiss Gdoi
10.1038/nm1542subject
Has Abstractpub_date
2007-04-01 00:00:00pages
448-54issue
4eissn
1078-8956issn
1546-170Xpii
nm1542journal_volume
13pub_type
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