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Cathepsin C limits acute viral infection independently of NK cell and CD8+ T-cell cytolytic function

Christopher E Andoniou1, Peter Fleming, Vivien R Sutton

  • 1Immunology and Virology Program, Centre for Ophthalmology and Visual Science, The University of Western Australia, Nedlands, Western Australia, Australia.

Immunology and Cell Biology
|October 27, 2010
PubMed

Insights

Cathepsin C (CatC) plays a crucial role in controlling murine cytomegalovirus (MCMV) infection. CatC deficiency impairs viral replication control independently of cytotoxic T lymphocyte and NK cell activity.

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Cytotoxic T lymphocytes (CTLs) and natural killer (NK) cells use perforin and granzymes (Gzm) to destroy target cells.
  • Granzyme activation, particularly GzmA and B, is primarily mediated by cathepsin C (CatC).
  • GzmAB-deficient mice show increased susceptibility to murine cytomegalovirus (MCMV) infection.

Purpose of the Study:

  • To compare the MCMV infection control in CatC-null mice with that of GzmAB-deficient mice.
  • To investigate the role of CatC in MCMV replication and immune cell function.

Main Methods:

  • Comparative analysis of MCMV infection in CatC(-/-) mice and GzmAB-deficient mice.
  • Assessment of organ-specific viral replication.
  • Evaluation of NK cell and CTL cytolytic function during infection.

Main Results:

  • CatC(-/-) mice exhibit organ-specific defects in controlling MCMV replication, distinct from GzmAB(-/-) mice.
  • The cytolytic function of NK cells and CTLs in CatC-deficient mice was comparable to wild-type.
  • CatC is involved in limiting MCMV replication through a mechanism independent of its role in effector cell cytotoxicity.

Conclusions:

  • CatC plays a significant role in controlling MCMV infection.
  • This role is separate from its known function in activating cytotoxic effector cells.
  • These findings reveal a novel function for CatC in antiviral defense.

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