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Related Experiment Videos

Proteolytic processing activates a viral superantigen

D Mix1, G M Winslow

  • 1Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany 12201-2002, USA.

The Journal of Experimental Medicine
|October 1, 1996
PubMed
Summary
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Mouse mammary tumor virus (MMTV) superantigens require proteolytic processing by furin to activate T cells. Bacterial superantigens do not require this processing for T cell activation, highlighting a key difference in their immune response mechanisms.

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Mouse mammary tumor virus (MMTV) superantigens (vSAg) are recognized by T cells.
  • Proteolytic processing is crucial for the function of many proteins, including viral superantigens.

Purpose of the Study:

  • To investigate the role of the endoprotease furin in the presentation of MMTV superantigen 7 (vSAg7) to T cells.
  • To determine if vSAg7 requires furin-mediated proteolytic processing for T cell activation.

Main Methods:

  • Chinese Hamster Ovary (CHO) cells, both furin-positive and furin-negative variants, were transfected with vSAg7 and MHC genes.
  • T cell hybridomas were used to assess antigen presentation.
  • Protease inhibitor leupeptin and furin gene transfection were employed to modulate proteolytic activity.

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Main Results:

  • Furin-positive cells efficiently presented vSAg7, while furin-negative cells showed poor presentation.
  • Restoring furin expression in negative cells re-established vSAg7 presentation.
  • Leupeptin treatment abolished the marginal presentation of vSAg7 in furin-deficient cells, indicating limited activity of other proteases.

Conclusions:

  • Viral superantigens, unlike bacterial superantigens, necessitate proteolytic processing, specifically by furin, for T cell activation.
  • Furin-dependent processing is essential for effective presentation of vSAg7.
  • This study elucidates a critical step in the immune recognition of viral superantigens.