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Area of Science:

  • Immunology
  • Transplantation immunology
  • Molecular medicine

Background:

  • Costimulatory pathways critically regulate T-cell activation and tolerance.
  • The CD28-B7 pathway is a key target for therapeutic intervention in various diseases.
  • Current CD28-targeting therapies are employed in melanoma, autoimmune diseases, and transplantation.

Purpose of the Study:

  • To review current knowledge of CD28 and cytotoxic T-lymphocyte antigen-4 (CTLA-4) signaling.
  • To evaluate the challenges and current state of utilizing these pathways for transplant tolerance.

Main Methods:

  • Review of existing literature on CD28 and CTLA-4 signaling.
  • Analysis of therapeutic strategies involving costimulatory pathway modulation.

Main Results:

  • Belatacept, a CTLA-4 fusion protein, is approved for transplantation.
  • Understanding of costimulatory pathway complexity is still evolving.
  • Oversimplified views of positive/negative costimulators are inadequate.

Conclusions:

  • Belatacept's success highlights the therapeutic potential of targeting costimulatory pathways.
  • Further research is needed to fully elucidate the intricate mechanisms of immune modulation by these pathways.
  • Therapeutic strategies must consider potential off-target effects on regulatory T-cell populations.