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Androgen ablation mitigates tolerance to a prostate/prostate cancer-restricted antigen

Charles G Drake1, Amy D H Doody, Marianne A Mihalyo

  • 1Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland 21231, USA. cdrake@jhmi.edu

Cancer Cell
|March 16, 2005
PubMed

Insights

Prostate cancer tumors induce immune tolerance in T cells, hindering treatment. Androgen ablation can reverse this tolerance, making prostate cancer immunotherapy more effective when combined with this treatment.

Area of Science:

  • Immunology
  • Oncology
  • Prostate Cancer Research

Background:

  • The T cell response to prostate cancer is not fully understood.
  • Current prostate cancer treatments like androgen ablation have limitations.

Purpose of the Study:

  • To investigate T cell recognition and response in prostate cancer.
  • To determine the impact of tumorigenesis and androgen ablation on T cell function in prostate cancer.

Main Methods:

  • Created transgenic mice with prostate-specific antigen expression.
  • Crossed these mice with TRAMP mice developing spontaneous prostate cancer.
  • Utilized adoptive transfer of prostate-specific CD4 T cells.

Main Results:

  • The prostate gland is ignored by T cells without cancer.
  • Tumorigenesis leads to tolerogenic T cell recognition, causing hyporesponsiveness.
  • Androgen ablation mitigated T cell tolerance, enabling T cell expansion and effector function post-vaccination.

Conclusions:

  • Prostate cancer induces a tolerogenic T cell response.
  • Androgen ablation can overcome this tolerance, enhancing T cell function.
  • Immunotherapy for prostate cancer may be most effective after androgen ablation.

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