[CD28 costimulation and checkpoint inhibition in T cells]

Area of Science:

• Immunology
• Oncology

Background:

• T cell activation requires T cell receptor (TCR) and CD28 costimulation signals.
• CD28 signaling indicates threat, initiating an immune response.
• Immune checkpoints regulate T cell responses to prevent autoimmunity.

Purpose of the Study:

• To introduce immunoregulation mediated by checkpoint molecules.
• To explain the role of checkpoint molecules in T cell activation and cancer.

Main Methods:

• Review of basic science literature.
• Analysis of clinical study reports.

Main Results:

• CTLA-4 and PD-1 dampen CD28-mediated costimulation.
• Cancer cells exploit PD-1 ligands to evade T cell attacks.
• Checkpoint inhibitors are now standard cancer therapy.

Conclusions:

• Checkpoint inhibitors have significantly advanced cancer immunotherapy.
• Further developments in immunotherapy hold promise for future cancer treatments.