Identification of a tumor-associated contact-dependent activity which reversibly downregulates cytolytic function of CD8+ T cells

Daniel L. Levey, Heiichiro Udono, Michael Heike, Pramod K. Srivastava

Research output: Contribution to journalArticle

4 Citations (Scopus)


Tumors elicit an immune response in hosts and yet, paradoxically, often grow progressively with fatal consequences. This phenomenon has been attributed to the possible expression by tumor cells of immunomodulatory factors that overcome the anti-tumor effector functions of both specific and non-specific immune cells. This study reports on the ability of the methylcholanthrene- induced fibrosarcoma, Meth A, as well as other tumors of varied histological origins to downregulate the lytic activity of CD8+ T cells. The suppressive activity is contact-dependent and reversible. As tumor-bearing hosts are rarely immunosuppressed systemically, these findings may explain how local events within the tumor bed subvert the specific anti-tumor immune response.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalCancer Immunity
Publication statusPublished - Mar 30 2001
Externally publishedYes



  • Cultured tumor cells
  • Cytotoxic T lymphocytes
  • Immunologic factors
  • Mice
  • Tumor escape

ASJC Scopus subject areas

  • Immunology
  • Cancer Research

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