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Independent modes of natural killing distinguished in mice lacking Lag3

T Miyazaki1, A Dierich, C Benoist

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire (INSERM, CNRS, ULP), Strasbourg, France.

Science (New York, N.Y.)
|April 19, 1996
PubMed

Insights

The Lymphocyte-activation gene 3 (LAG3) protein, initially thought to control T cells, actually impacts natural killer (NK) cell function. Mice lacking LAG3 show impaired NK cell killing of specific tumor targets, revealing its role in natural killing modes.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • The Lymphocyte-activation gene 3 (LAG3) protein shares similarities with CD4, suggesting a role in T cell regulation.
  • Previous assumptions posited LAG3's primary function in T cell-mediated immunity.

Purpose of the Study:

  • To investigate the precise role of LAG3 in immune responses, particularly in T cell and natural killer (NK) cell compartments.
  • To elucidate the function of LAG3 in the context of NK cell-mediated cytotoxicity.

Main Methods:

  • Analysis of immune cell compartments in mice with a Lag3 null mutation.
  • Assessment of natural killer cell cytotoxicity against various target cells, including tumor targets and cells with MHC class I disparities.

Main Results:

  • Mice lacking LAG3 exhibited a defect predominantly in the natural killer (NK) cell compartment, not T cells.
  • NK cell-mediated killing of specific tumor targets was significantly inhibited or abolished in Lag3-deficient mice.
  • Lysis of target cells presenting major histocompatibility complex (MHC) class I disparities remained unaffected.

Conclusions:

  • LAG3 functions as a receptor or coreceptor that modulates natural killer cell activity.
  • LAG3 plays a critical role in defining distinct modes of natural killing, particularly against certain tumor cells.
  • The findings challenge the prior understanding of LAG3's role, highlighting its significance in innate immunity via NK cells.

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