Detection of protein alterations in male breast cancer using two dimensional gel electrophoresis and mass spectrometry: The involvement of several pathways in tumorigenesis

Karim Chahed, Maria Kabbage, Bechr Hamrita, Christelle Lemaitre Guillier, Mounir Trimeche, Sami Remadi, Laurence Ehret-Sabatier, Lotfi Chouchane

Research output: Contribution to journalArticle

21 Citations (Scopus)


Background: Little emphasis has been placed today on the elucidation of protein alterations in male breast carcinogenesis. Methods: Protein extracts were subjected to both isoelectric focusing (IEF) and non-equilibrium pH gradient electrophoretic (NEPHGE) analyses. Differentially expressed proteins in tumor tissues were identified by matrix assisted laser desorption /ionization time of flight (MALDI-TOF) mass spectrometry and database search. Results: Some of the alterations involve variations in the expression of cytokeratins 8, 18 and 19. More interestingly, tropomyosin1, a protein known to play a role in suppression of the malignant phenotype, was found to be under-expressed in cancer tissues, implicating a possible pivotal role for this protein in male breast carcinogenesis. Co-upregulation of molecular chaperones (heat shock protein HSP27 and protein disulfide isomerase), stress related proteins (peroxiredoxin 1 and peptidylprolyl isomerase A) and glycolytic enzymes (enolase 1) occurred also in male breast tumors. Some of the remaining alterations include proteins involved in invasion and metastasis, such as galectin 1 and cathepsin D. Conclusions: The present study represents a first proteomic investigation of protein alterations in infiltrating ductal carcinomas (IDCA) of the male breast. A number of protein alterations in tumor tissues have been characterised thus, providing new insights into the molecular mechanisms underlying this disease.

Original languageEnglish
Pages (from-to)106-114
Number of pages9
JournalClinica Chimica Acta
Issue number1-2
Publication statusPublished - Feb 2008
Externally publishedYes



  • Infiltrating ductal carcinomas
  • Male breast cancer
  • Proteomics

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry

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