Post-Translational Modifications of Eukaryotic Initiation Factor-5A (eIF-5a) as a New Target for Anti-Cancer Therapy

  • Michele Caraglia
  • Pierosandro Tagliaferri
  • Alfredo Budillon
  • Alberto Abbruzzese
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 472)


Eukaryotic translation initiation factor 5A (eIF-5A) is the only cell protein that contains the unusual basic amino acid hypusine [Nε-(4-amino-2-hydroxybutyl)lysine]. Hypusine is formed by the transfer of the butylamine portion from spermidine to the ε-amino group of a specific lysine residue of eIF-5A precursor and the subsequent hydroxylation at carbon 2 of the incoming 4-aminobutyl moiety. Agents that reduce cell hypusine levels inhibit the growth of mammalian cells. These observations suggest that hypusine is crucial for proliferation and transformation of eukaryotic cells. Here we have studied whether the inhibition of hypusine synthesis can potentiate the anticancer activity of the anti-tumour agents interferon-α (IFNα) and cytosine arabinoside (ara-C). We have found that IFNα increased epidermal growth factor receptor (EGF-R) expression, but reduced S phase and proliferative marker expression in human epidermoid KB cells and that this effect was antagonised by epidermal growth factor (EGF). Growth inhibition induced by IFNα was paralleled by decreased hypusine synthesis and, when EGF counteracted anti-proliferative effects, a reconstitution of hypusine levels was recorded. We also studied the effects of IFNα on the cytotoxicity of the recombinant toxin TP40 which inhibits elongation factor 2, another step of protein synthesis, through EGF-R binding and internalisation; IFNα induced an about 27-fold increase of TP40 cytotoxicity in KB cells.

Ara-C, another antineoplastic agent commonly used in haematologic malignancies, induced both apoptosis and iron depletion in human acute myeloid leukaemic cells. The combination of ara-C and of the iron chelator desferioxamine, a strong inhibitor of hypusine synthesis, had a synergistic activity on apoptosis in these cells. The data strongly suggest that the post-translational modifications of eIF-5A could be a suitable target for the potentiation of the activity of anti-cancer agents.


Epidermal Growth Factor Receptor High Performance Liquid Chromatography Epidermal Growth Factor Receptor Expression Haem Iron Cytosine Arabinoside 
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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Michele Caraglia
    • 1
  • Pierosandro Tagliaferri
    • 2
  • Alfredo Budillon
    • 3
  • Alberto Abbruzzese
    • 1
  1. 1.Department of Biochemistry and Biophysics “F. Cedrangolo”Second University of NaplesItaly
  2. 2.Department of Endocrinology and Molecular and Clinical OncologyUniversity “Federico II” of NaplesItaly
  3. 3.Division of Experimental Oncology CNational Tumour Institute Foundation “G. Pascale,”NaplesItaly

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