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J Biol Chem, Vol. 273, Issue 25, 15382-15386, June 19, 1998
,
From In vitro studies have shown that
ferritin iron incorporation is mediated by a ferroxidase activity
associated with ferritin H subunits (H-Ft) and a nucleation center
associated with ferritin L subunits (L-Ft). To assess the role played
by the ferritin subunits in regulating intracellular iron distribution,
we transfected mouse erythroleukemia cells with the H-Ft subunit gene
mutated in the iron-responsive element. Stable transfectants displayed high H-Ft levels and reduced endogenous L-Ft levels, resulting in a
marked change in the H:L subunit ratio from 1:1 in control cells to as
high as 20:1 in some transfected clones. The effects of H-Ft
overexpression on the labile iron pool were determined in intact cells
by a novel method based on the fluorescent metallosensor calcein. H-Ft
overexpression resulted in a significant reduction in the iron pool,
from 1.3 µM in control cells to 0.56 µM in
H-Ft transfectants, and in higher buffering capacity following iron loads. A fraction of the H-Ft-associated iron was labile, available to
cell-permeant, but not cell-impermeant, chelators. The results of this
study provide the first in vivo direct demonstration of the
capacity of H-Ft to sequester cell iron and to regulate the levels of
the labile iron pool.
INSERM U409, Faculté Xavier Bichat, BP416,
75870 Paris Cedex 18, France, the § Department of Biological
Chemistry, Institute of Life Sciences, Hebrew University of Jerusalem,
Jerusalem 91904, Israel, and ¶ Dipartimento di Ricerca
Biologica e Tecnologica, San Raffaele Scientific Institute, Via
Olgettina 58, 20132 Milano, Italy
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