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Related Experiment Videos

Cloned antigens and antiidiotypes

D Herlyn1, R Somasundaram, J Zaloudik

  • 1Wistar Institute, Philadelphia, PA 19104, USA.

Hybridoma
|April 1, 1995
PubMed
Summary

Recombinant colorectal cancer (CRC) antigen CO17-1A/GA733 shows promise as a vaccine. Preclinical studies indicate it elicits stronger immune responses than anti-idiotypic antibodies, suggesting potential for CRC patient treatment.

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Area of Science:

  • Oncology
  • Immunology
  • Vaccine Development

Background:

  • Monoclonal and polyclonal anti-idiotypic antibodies mimicking colorectal carcinoma (CRC) antigen CO17-1A/GA733 have induced immunity in CRC patients.
  • Observed immune responses may correlate with clinical benefits in some patients.

Purpose of the Study:

  • To evaluate the immunogenicity of molecularly cloned and expressed CO17-1A/GA733 antigen.
  • To compare the immune responses elicited by recombinant antigen versus anti-idiotypic antibodies.

Main Methods:

  • Molecular cloning and expression of CO17-1A/GA733 antigen in baculo-, adeno-, and vaccinia viruses.
  • Preclinical studies assessing humoral and cellular immunity in response to recombinant antigen.
  • Comparison of antibody titers induced by recombinant antigen and anti-idiotypic antibodies.

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Main Results:

  • Recombinant CO17-1A/GA733 antigen preparations elicited specific humoral immunity (cytotoxic antibodies) and cellular immunity (DTH-reactive and proliferative T cells).
  • Antibody titers in animals were significantly higher when induced by recombinant antigen compared to anti-idiotypes.
  • The recombinant antigen demonstrated potential for inducing robust immune responses.

Conclusions:

  • The molecularly cloned and expressed CO17-1A/GA733 antigen is a potent immunogen.
  • Recombinant antigen preparations show superior immunogenicity compared to anti-idiotypic antibodies.
  • The recombinant antigen holds significant potential as a vaccine candidate for colorectal cancer patients.