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Related Experiment Videos

pH-dependent LAK cell cytotoxicity

T Severin1, B Müller, G Giese

  • 1Institut für Biophysik und Strahlenbiologie, Albert-Ludwigs-Universität, Freiburg i.Br., Germany.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|January 1, 1994
PubMed
Summary
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Acidic tumor microenvironments significantly impair lymphokine-activated killer (LAK) cell activity, reducing their cancer-fighting ability. Strategies to elevate tumor pH are crucial for effective LAK cell immunotherapy.

Area of Science:

  • Immunology
  • Cancer Biology
  • Biochemistry

Background:

  • Solid tumors often exhibit a lower pH (6.6-7.2) compared to normal tissues (7.0-7.5).
  • This acidic tumor microenvironment may impact the efficacy of immune responses against cancer.

Purpose of the Study:

  • To investigate the effect of acidic pH on the cytotoxic activity of lymphokine-activated killer (LAK) cells.
  • To determine if pH influences LAK cell effectiveness in targeting cancer cells.

Main Methods:

  • LAK cells were cultured and their cytotoxic activity was tested against K-562 human erythroleukemia cells.
  • A two-color flow cytometric method was used to measure specific cell lysis.
  • Experiments were conducted at physiological pH (7.4) and various acidic conditions (pH 6.8, 6.3, 5.8).

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Main Results:

  • At physiological pH (7.4), LAK cell cytotoxicity ranged from 15% to 48% (E:T ratio 50:1).
  • Acidic conditions (pH 6.8, 6.3, 5.8) significantly reduced LAK cell-mediated cytotoxicity, with up to 70% inhibition of specific lysis.
  • This pH-dependent inhibition was consistent across different donors, culture periods, and effector-to-target ratios.

Conclusions:

  • The study demonstrates that acidic tumor microenvironments markedly inhibit LAK cell cytotoxic activity.
  • This pH dependence may explain the suppressed natural immune response observed in solid tumors.
  • Therapeutic strategies enhancing LAK cell and IL-2 immunotherapy should consider simultaneous inhibition of tumor acidification and elevation of tumor pH for improved success.