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  • Open Access

Nef variants from non-pathogenic lentiviral strains inhibit iron uptake through an AP2-dependent inhibition of transferrin endocytosis

  • 1, 2,
  • 1, 2,
  • 1,
  • 3,
  • 2,
  • 2,
  • 4,
  • 4,
  • 5,
  • 3 and
  • 1, 2
Retrovirology201310 (Suppl 1) :P42

https://doi.org/10.1186/1742-4690-10-S1-P42

  • Published:

Keywords

  • Intracellular Iron
  • Cellular Iron
  • Cellular Iron Uptake
  • Transferrin Uptake
  • Intracellular Iron Concentration

Background

Increased cellular iron levels are associated with high mortality in HIV-1 infection. Moreover iron is an important cofactor for viral replication, raising the question of whether modulation of intracellular iron can be linked to the pathogenicity of lentiviral infections. Here, we evaluated the effect on cellular iron uptake upon expression of the accessory protein Nef from divergent lentiviruses.

Results

Surface Transferrin receptor (TfR) levels are unaffected by Nef proteins of HIV-1 and its simian precursors but elevated in cells expressing Nefs from most other primate lentiviruses due to reduced TfR internalization. The SIV Nef-mediated reduction of TfR endocytosis is dependent on an N-terminal AP2 binding motif that is not required for downmodulation of CD4, CD28, CD3 or MHCI. Importantly, SIV Nef-induced inhibition of TfR endocytosis leads to the reduction of Transferrin uptake and intracellular iron concentration and is accompanied by attenuated lentiviral replication in macrophages.

Conclusions

Thus, this new SIV Nef function might limit viral replication in myeloid cells and may contribute to the absence of disease in SIV-infected monkeys. Altogether, lentiviruses actively modulate replication by the manipulation of cellular iron, which is an important determinant for viral pathogenicity.

Authors’ Affiliations

(1)
Institute of Virology, Helmholtz Zentrum Munich, German Research Center for Environmental Health, Munich, Germany
(2)
Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
(3)
Institut Curie, INSERM U932, Paris, France
(4)
Ulm University Medical Center, Institute of Molecular Virology, Ulm, Germany
(5)
German Primate Center, Göttingen, Germany

Copyright

© Koppensteiner et al; licensee BioMed Central Ltd. 2013

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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