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Suppression of erythropoietin gene expression by cadmium depends on inhibition of HIF-1, not stimulation of GATA-2

  • Molecular Toxicology
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Abstract

Long-term exposure of rats to cadmium (Cd) resulted in a marked suppression of erythropoietin (Epo) mRNA expression in the kidneys and the development of severe anemia. A recent report revealed that Cd inhibited hypoxia-inducible factor 1 (HIF-1) binding activity and Epo mRNA expression and protein production. However, Epo gene expression is also regulated by transcription factor GATA-2, which binds to the GATA binding site of the Epo promoter. To elucidate the mechanism of suppression of Epo by Cd, the effect of Cd on GATA-2 function was studied. Epo promoter/enhancer luciferase constructs, one with the wild-type promoter and another with a promoter with a mutant GATA site, were transfected into Hep3B cells. No significant difference in Epo promoter activity in these two types of cells was observed in the presence of Cd. The binding activity of GATA-2 was not affected by Cd. This study showed that Cd inhibited HIF-1 binding activity and Epo promoter activity, and then suppressed Epo protein production. Inhibition of Epo gene expression by Cd depends on suppression of HIF-1 binding activity, not on alteration of GATA function.

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Acknowledgements

We thank Hiromi Tanaka and Ayako Hoshino for their expert technical assistance. This work was supported by Grants-in-aid for scientific research from the Ministry of Education, Science and Culture of Japan, and the Renal Anemia Foundation, Japan.

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Authors and Affiliations

  1. Division of Hematology, Institute of Clinical Medicine, University of Tsukuba, 305-8575, Tsukuba, Ibaraki, Japan

    Naoshi Obara, Shigehiko Imagawa, Yoko Nakano & Toshiro Nagasawa

  2. Center for Tsukuba Advanced Research Alliance and Institute of Basic Medical Sciences, University of Tsukuba, 305-8577, Tsukuba, Ibaraki, Japan

    Norio Suzuki & Masayuki Yamamoto

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  1. Naoshi Obara
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  2. Shigehiko Imagawa
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  3. Yoko Nakano
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  4. Norio Suzuki
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  5. Masayuki Yamamoto
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  6. Toshiro Nagasawa
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Correspondence to Shigehiko Imagawa.

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Obara, N., Imagawa, S., Nakano, Y. et al. Suppression of erythropoietin gene expression by cadmium depends on inhibition of HIF-1, not stimulation of GATA-2. Arch Toxicol 77, 267–273 (2003). https://doi.org/10.1007/s00204-003-0444-0

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  • DOI: https://doi.org/10.1007/s00204-003-0444-0

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