Human antibodies against the polymorphic epithelial mucin in ovarian cancer patients recognise a novel sequence in the tandem repeat region

C. Petrarca, A. Rughetti, H. Rahimi, F. Agostini, V. Turchi, C. Apollonj Ghetti, G. Scambia, L. Frati, M. Nuti

Research output: Contribution to journalArticle

Abstract

The humoral immune response to the polymorphic epithelial mucin (PEM) was studied by characterising the reactivity of human antibodies generated by EBV-immortalised B-cells from tumour-draining lymph nodes of ovarian cancer patients. All the human antibodies, selected in ELISA for their reactivity to the protein core tandem repeat sequence, reacted with PEM-expressing tumour cells. Aberrant glycosylation of the peptide core of the PEM molecule in cancer cells leads to the exposure of peptide epitopes that can be considered tumour specific. The epitope mapping of six human antibodies revealed that only one of them contained the PDTR sequence, shown to be the immunodominant epitope in the mouse. Four of the six human antibodies recognised a novel common immunogenic sequence (APPAH) in the tandem repeats. The binding of these human antibodies did not appear to be modulated by the length of the carbohydrate side chains, as shown by O-glycosylation inhibition studies. These results indicate that distinct sequences within the tandem repeat of PEM are target for a humoral immune response in humans. The presence of antibodies directed against different epitopes within the same antigenic region may modulate the antigen presentation process and the ongoing immune response. These data may help in clarifying the mechanisms of the immune response to PEM in cancer patients for the development of PEM-based immunotherapy.

Original languageEnglish
Pages (from-to)2155-2163
Number of pages9
JournalEuropean Journal of Cancer
Volume32
Issue number12
DOIs
Publication statusPublished - Nov 1996

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Keywords

  • epitope mapping
  • human antibodies
  • immune response
  • polymorphic epithelial mucin
  • tumour-associated antigens

ASJC Scopus subject areas

  • Cancer Research
  • Hematology
  • Oncology

Cite this

Petrarca, C., Rughetti, A., Rahimi, H., Agostini, F., Turchi, V., Ghetti, C. A., Scambia, G., Frati, L., & Nuti, M. (1996). Human antibodies against the polymorphic epithelial mucin in ovarian cancer patients recognise a novel sequence in the tandem repeat region. European Journal of Cancer, 32(12), 2155-2163. https://doi.org/10.1016/S0959-8049(96)00254-7