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Related Experiment Videos

The B7-CD28 superfamily.

Arlene H Sharpe1, Gordon J Freeman

  • 1Immunology Research Division, Department of Pathology, Brigham, and Women's Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, Massachusetts 02115, USA. asharpe@rics.bwh.harvard.edu

Nature Reviews. Immunology
|March 26, 2002
PubMed
Summary
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New B7 and CD28 molecules regulate T-cell responses. Discoveries reveal novel pathways and B7 homologues in peripheral tissues, highlighting unexplored immunoregulatory mechanisms and therapeutic potential.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The B7-1/B7-2-CD28/CTLA-4 pathway is critical for T-cell activation and immune tolerance.
  • Recent discoveries have identified new B7 and CD28 molecules and associated pathways.

Purpose of the Study:

  • To summarize current knowledge on newly discovered B7 and CD28 family members.
  • To discuss the implications of these findings for regulating T-cell responses.
  • To explore the therapeutic potential of these novel immunoregulatory pathways.

Main Methods:

  • Literature review and synthesis of recent research findings.
  • Analysis of the expression patterns of B7 homologues.
  • Discussion of potential receptor-ligand interactions.

Main Results:

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  • New B7 and CD28 molecules and pathways significantly impact T-cell regulation, particularly in previously activated T cells.
  • B7 homologues are expressed on non-professional antigen-presenting cells, suggesting peripheral tissue immune regulation.
  • The existence of B7 homologues with unknown receptors indicates undiscovered immunoregulatory pathways.

Conclusions:

  • The B7 and CD28 families are expanding, revealing complex immunoregulatory networks.
  • These novel pathways offer new therapeutic targets for immune modulation.
  • Further research is needed to identify unknown receptors and fully elucidate these pathways.