Expression of the translation initiation factors eIF-4E and eIF-2* is frequently increased in neoplastic cells of Hodgkin lymphoma

Hum Pathol. 2008 Jun;39(6):910-6. doi: 10.1016/j.humpath.2007.10.021. Epub 2008 Jan 30.

Abstract

The rate of protein synthesis is regulated in part by 2 key translation initiation factors, eIF-4E and eIF-2*. The expression and activity of both factors are increased transiently when normal resting cells are stimulated to proliferate, but they are constitutively elevated in oncogene-transformed cultured cells. Overexpression of either initiation factor induces a tumorigenic phenotype in rodent cells. We have shown earlier that expression of both eIF-4E and eIF-2* is increased in non-Hodgkin lymphomas (non-HLs). In this study, we performed an immunohistochemical survey of these translation initiation factors in neoplastic cells of HL. We also used Western blot to addressed the possibility that eIF-4E increases expression of NFkappaB. Our results indicate that both eIF-4E and eIF-2* are strongly expressed in neoplastic cells of HL in most cases examined as compared with weak or undetectable expression in most surrounding lymphocytes. An increase in eIF-4E expression may lead to constitutively high expression of NFkappaB, a transcription factor implicated in resistance to apoptosis and induction of cytokine gene expression in various cells, including neoplastic cells of HL.

MeSH terms

  • Animals
  • Biomarkers, Tumor / metabolism
  • Blotting, Western
  • Eukaryotic Initiation Factor-2 / metabolism*
  • Eukaryotic Initiation Factor-4E / metabolism*
  • Fluorescent Antibody Technique, Indirect
  • Hodgkin Disease / metabolism*
  • Hodgkin Disease / pathology
  • Humans
  • Immunoenzyme Techniques
  • Lymphocytes / metabolism
  • Lymphocytes / pathology
  • Mice
  • NF-kappa B / metabolism
  • NIH 3T3 Cells

Substances

  • Biomarkers, Tumor
  • Eukaryotic Initiation Factor-2
  • Eukaryotic Initiation Factor-4E
  • NF-kappa B