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Ascorbate-mediated Iron Release from Ferritin in the Presence of Alloxan

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Abstract

Release of iron from ferritin requires reduction of ferric to ferrous iron. The iron can participate in the diabetogenic action of alloxan. We investigated the ability of ascorbate to catalyze the release of iron from ferritin in the presence of alloxan. Incubation of ferritin with ascorbate alone elicited iron release (33 nmol/10 min) and the generation of ascorbate free radical, suggesting a direct role for ascorbate in iron reduction. Iron release by ascorbate significantly increased in the presence of alloxan, but alloxan alone was unable to release measurable amounts of iron from ferritin. Superoxide dismutase significantly inhibited ascorbate-mediated iron release in the presence of alloxan, whereas catalase did not. The amount of alloxan radical (A·−) generated in reaction systems containing both ascorbate and alloxan decreased significantly upon addition of ferritin, suggesting that A·− is directly involved in iron reduction. Although release of iron from ferritin and generation of A·− were also observed in reactions containing GSH and alloxan, the amount of iron released in these reactions was not totally dependent on the amount of A·− present, suggesting that other reductants in addition to A·− (such as dialuric acid) may be involved in iron release mediated by GSH and alloxan. These results suggest that A·− is the main reductant involved in ascorbate-mediated iron release from ferritin in the presence of alloxan and that both dialuric acid and A·− contribute to GSH/alloxan-mediated iron release.

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Abbreviations

A·− :

Alloxan radical

AFR:

Ascorbate free radical

BPS:

bathophenanthrolinedisulfonic acid disodium salt

EDTA:

ethylenediaminetetraacetic acid

ESR:

electron spin resonance

GSH:

glutathione reduced form

O· −2 :

superoxide anion radical

PBS:

phosphate buffered saline

ROS:

reactive oxygen species

SOD:

superoxide dismutase

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Authors and Affiliations

  1. Department of Biochemistry, Hokkaido Pharmaceutical University, 7-1 Katsuraoka-cho, Otaru, Hokkaido, 047-0264, Japan

    Koichi Sakurai, Ami Nabeyama & Yukio Fujimoto

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  1. Koichi Sakurai
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  2. Ami Nabeyama
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  3. Yukio Fujimoto
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Correspondence to Koichi Sakurai.

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Sakurai, K., Nabeyama, A. & Fujimoto, Y. Ascorbate-mediated Iron Release from Ferritin in the Presence of Alloxan. Biometals 19, 323–333 (2006). https://doi.org/10.1007/s10534-005-1300-x

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  • DOI: https://doi.org/10.1007/s10534-005-1300-x

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