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Related Experiment Videos

B7-1 expression by a non-antigen presenting cell-derived tumor

S J Antonia1, T Muñoz-Antonia, G Soldevila

  • 1Section of Immunobiology, Yale School of Medicine, New Haven, Connecticut 06510, USA.

Cancer Research
|June 1, 1995
PubMed
Summary

Tumor cells may express B7-1 molecules, a key immune activator, even without antigen-presenting cells. This suggests a potential natural immune surveillance mechanism against developing cancers.

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Area of Science:

  • Immunology
  • Oncology
  • Cell Biology

Background:

  • The concept of natural immunosurveillance against neoplastic cells remains debated.
  • T cells encountering tumor antigens without co-stimulation from antigen-presenting cells may become inactivated, hindering immune response.

Purpose of the Study:

  • To investigate the potential for immunosurveillance in a transgenic tumorigenesis model where T cells reactive to tumor antigens are absent.
  • To explore the expression of immune regulatory molecules on tumor cells and pre-neoplastic cells.

Main Methods:

  • Utilized a transgenic mouse model of tumorigenesis.
  • Analyzed a tumor cell line derived from the model for expression of the T-cell costimulatory molecule B7-1.
  • Examined immortalized, non-tumorigenic cell lines for B7 expression.

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Main Results:

  • Tumor cells derived from the model expressed B7-1, a molecule typically found on antigen-presenting cells.
  • Several immortalized, non-tumorigenic cell lines also expressed B7.
  • This indicates that oncogenic insults can induce B7-1 expression on host cells.

Conclusions:

  • Host cells may be induced to express B7-1 following oncogenic events.
  • Induced B7-1 expression could represent a primary mechanism of immunosurveillance against tumors.