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High iron storage levels are associated with increased DNA oxidative injury in patients on regular hemodialysis

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Abstract

Background

Accumulating evidence suggests that oxidative stress is enhanced in patients on regular hemodialysis (HD). Iron supplementation is essential for the treatment of renal anemia, but there is a possibility that it could enhance oxidative stress by inducing the Fenton reaction. Here, we report our investigation of the relation between iron storage and DNA oxidative injury in HD patients.

Methods

The study subjects were 48 patients on regular HD (age, 62.7 ± 12.1 years; HD duration, 67.2 ± 62.5 months; non-diabetic/diabetic; 22:26). Patients who were positive for hepatitis C virus antibody (HCV Ab), or hepatitis B surface antigen (HBsAg), and those with inflammatory or malignant diseases were excluded. The serum 8-hydroxy-2′-deoxyguanosine (8-OHdG) level, a marker of DNA oxidative injury, was measured before the first HD session of the week in all patients, and factors associated with high serum 8-OHdG were investigated. In 9 patients with a serum ferritin level of more than 1000 ng/ml at study entry, serum 8-OHdG levels were followed up for 6 months in the absence of iron supplementation.

Results

Multivariate analysis showed that the serum ferritin level was a significant and independent determinant of serum 8-OHdG, and serum ferritin correlated significantly with the total dose of iron supplementation during the 6-month period of the study. In the nine patients, without iron supplementation, serum 8-OHdG levels, as well as serum ferritin, decreased significantly during follow-up.

Conclusions

Our results suggest that increased iron storage may induce DNA oxidative injury in patients on regular HD, and that the serum ferritin level is a surrogate marker for this pathological condition.

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Authors and Affiliations

  1. Department of Kidney and Hypertension, Tokyo Jikei University School of Medicine, 3-25-8 Nishishinbashi, Minato-ku, Tokyo, 105-8461, Japan

    Kazunobu Yoshimura, Hirofumi Nakano, Keitaro Yokoyama & Masaaki Nakayama

Authors
  1. Kazunobu Yoshimura
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  2. Hirofumi Nakano
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  3. Keitaro Yokoyama
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  4. Masaaki Nakayama
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Correspondence to Kazunobu Yoshimura.

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Yoshimura, K., Nakano, H., Yokoyama, K. et al. High iron storage levels are associated with increased DNA oxidative injury in patients on regular hemodialysis. Clin Exp Nephrol 9, 158–163 (2005). https://doi.org/10.1007/s10157-005-0354-y

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  • DOI: https://doi.org/10.1007/s10157-005-0354-y

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