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Related Experiment Videos

Negative co-receptors on lymphocytes.

Rebecca J Greenwald1, Yvette E Latchman, Arlene H Sharpe

  • 1Immunology Research Division, Department of Pathology, Brigham and Women's Hospital, 221 Longwood Avenue, Boston, MA 02115, USA. rgreenwald@rics.bwh.harvard.edu

Current Opinion in Immunology
|April 26, 2002
PubMed
Summary

Negative immunoregulatory signals from the B7-CD28 superfamily, including CTLA-4 and PD-1, are crucial for T cell regulation. These pathways, along with ICOS, modulate immune responses, offering insights into immune tolerance and activation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Negative immunoregulatory signals are critical for maintaining T cell homeostasis and preventing autoimmunity.
  • The B7-CD28 superfamily plays a pivotal role in modulating T cell activation and tolerance.
  • Understanding these pathways is essential for developing immunotherapies.

Purpose of the Study:

  • To review recent advances in understanding the B7-CD28 superfamily's role in T cell regulation.
  • To highlight structural insights into CTLA-4 inhibitory functions.
  • To elucidate the mechanisms of PD-1 and ICOS in immune responses.

Main Methods:

  • Review of recent scientific literature and structural biology studies.
  • Analysis of data on T cell receptor (TCR) and CD28 signaling pathways.

Related Experiment Videos

  • Investigation of Inducible T-cell Costimulator (ICOS) function in different immune contexts.

    • Main Results:

    • Structural data for CTLA-4 have illuminated its inhibitory mechanisms.
    • The PD-1/PD-1 ligand pathway effectively downregulates TCR and CD28 signals.
    • ICOS demonstrates dual roles, capable of both inhibiting and stimulating T cell responses depending on the immune response phase.

    Conclusions:

    • The B7-CD28 superfamily, encompassing CTLA-4, PD-1, and ICOS, is central to fine-tuning T cell activation and tolerance.
    • Distinct pathways within this superfamily have unique regulatory functions.
    • Further research into these pathways holds promise for therapeutic interventions in immune-related diseases.