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Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports
Published on: November 28, 2019
Immune resistance orchestrated by the tumor microenvironment
Thomas F Gajewski1, Yuru Meng, Christian Blank
1Department of Pathology, University of Chicago, Chicago, IL 60637, USA. tgajewsk@medicine.bsd.uchicago.edu
Immunological Reviews
|September 16, 2006
Summary
Despite cancer cells expressing antigens, tumors are not rejected due to immune system barriers. Targeting these downstream immune suppressive mechanisms is crucial for effective anti-tumor immunity and cancer regression.
Area of Science:
- Immunology
- Oncology
Background:
- Most cancers express antigens recognized by CD8(+) T lymphocytes.
- Tumors are often not spontaneously eliminated by the immune system, despite T-cell recognition.
Purpose of the Study:
- To investigate the barriers to anti-tumor immunity beyond initial T-cell priming.
- To identify downstream mechanisms preventing tumor rejection and clinical regression.
Main Methods:
- Analysis of T-cell responses in peripheral blood.
- Investigation of T-cell trafficking and function within the tumor microenvironment.
- Review of immunosuppressive mechanisms implicated in tumor evasion.
Main Results:
- Anti-tumor T-cell responses are often detected without tumor rejection.
- Impaired T-cell trafficking and dysfunction within the tumor microenvironment are observed.
- Mechanisms include T-cell anergy, regulatory cells, PD-L1, IDO, and TGF-β.
Conclusions:
- Barriers downstream from T-cell priming significantly impede anti-tumor immunity.
- Targeting immunosuppressive factors in the tumor microenvironment is essential for therapeutic success.
- These findings highlight new targets to enhance effector T-cell function for cancer treatment.
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