Human Colorectal Cancer (CRC) Antigen CO17-1A/GA733 Encoded by Adenovirus Inhibits Growth of Established CRC Cells in Mice

Weiping Li, Klara Berencsi, Saroj Basak, Rajasekharan Somasundaram, Robert P. Ricciardi, Eva Gönczöl, Jan Zaloudik, Alban Linnenbach, Haruhiko Maruyama, Pierre Miniou, Dorothee Herlyn

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The human colorectal carcinoma (CRC)-associated Ag CO17-1A/GA733, originally defined by mAbs CO17-1A and GA733, has been a useful target in passive immunotherapy of CRC patients with mAb and in active immunotherapy with anti-idiotypic Abs mimicking the CO17-1A or GA733 epitope. Both approaches have targeted single epitopes. We investigated the capacity of full-length CO17-1A/GA733 Ag expressing multiple potentially immunogenic epitopes and encoded by recombinant adenovirus 5 (Ad5 GA733-2) to induce humoral, cellular, and/or protective immunity in mice. Ad5 GA733-2 induced Ag-specific Abs that reacted predominantly to CO17-1A- and GA733-unrelated epitopes on the Ag and lysed Ag-positive CRC targets in conjunction with effector cells. Ad5 GA733-2-immune mice developed Ag-specific, proliferative lymphocytes of Th1 type and cytolytic lymphocytes. The use of Ad5 GA733-2 to immunize mice bearing established syngeneic CRC cells transfected with the human Ag induced significant and specific tumor regression. Cured mice resisted rechallenge with human CO17-1A/GA733 Ag-negative parental CRC cells, suggesting that targeting the human Ag on the murine transfectants induced protective immunity to other Ag expressed by the parental tumor. These results may explain the high potency of the recombinant vaccine. Thus, rAd5 GA733-2 may have potential as a vaccine for CRC patients.

Original languageEnglish
Pages (from-to)763-769
Number of pages7
JournalJournal of Immunology
Issue number2
Publication statusPublished - Jul 15 1997


ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

Cite this

Li, W., Berencsi, K., Basak, S., Somasundaram, R., Ricciardi, R. P., Gönczöl, E., Zaloudik, J., Linnenbach, A., Maruyama, H., Miniou, P., & Herlyn, D. (1997). Human Colorectal Cancer (CRC) Antigen CO17-1A/GA733 Encoded by Adenovirus Inhibits Growth of Established CRC Cells in Mice. Journal of Immunology, 159(2), 763-769.