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Related Experiment Videos

NK cells are essential for effective BCG immunotherapy.

S Brandau1, J Riemensberger, M Jacobsen

  • 1Division of Immunotherapy, Research Center Borstel, Borstel, Germany.

International Journal of Cancer
|May 8, 2001
PubMed
Summary

Natural killer (NK) cells are crucial for the effectiveness of bacillus Calmette-Guérin (BCG) immunotherapy in treating superficial bladder cancer. BCG therapy failed in mice lacking NK cells, highlighting their essential role in this cancer treatment.

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Area of Science:

  • Immunology
  • Oncology
  • Urology

Background:

  • Adjuvant intravesical bacillus Calmette-Guérin (BCG) is a standard immunotherapy for superficial bladder cancer.
  • The role of natural killer (NK) cells in BCG immunotherapy efficacy remains unclear, despite their known function in other immunotherapies.

Purpose of the Study:

  • To investigate the contribution of NK cells to BCG-induced cellular cytotoxicity against bladder tumor cells.
  • To determine the in vivo role of NK cells in the therapeutic effectiveness of BCG immunotherapy for bladder cancer.

Main Methods:

  • In vitro analysis of BCG-stimulated human mononuclear cells (BCG-activated killer cells) for cytotoxicity against bladder tumor cells.
  • In vivo studies using a murine bladder cancer model comparing BCG efficacy in wild-type, NK-deficient (beige), and anti-NK1.1 antibody-treated mice.

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Main Results:

  • BCG-activated killer cells, primarily composed of NK cells, demonstrated significant cytotoxicity against bladder tumor cells in vitro.
  • In vivo, BCG immunotherapy significantly improved survival in wild-type mice but was ineffective in NK-deficient or NK-depleted mice.

Conclusions:

  • NK cells are the major effector cells responsible for BCG-induced cytotoxicity against bladder tumor cells.
  • NK cells play a critical and indispensable role in the in vivo therapeutic efficacy of intravesical BCG immunotherapy for bladder cancer.