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T for two: when helpers need help.

Maurizio Zanetti1

  • 1The Laboratory of Immunology, Department of Medicine and Cancer Center, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0837, USA. mzanetti@ucsd.edu

Autoimmunity Reviews
|October 11, 2005
PubMed
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CD4 T cells cooperate with others of different specificity, impacting adaptive immunity. This cell cooperation, termed Th-Th cooperation, influences anti-tumor responses and autoimmunity, crucial for self/non-self discrimination.

Area of Science:

  • Immunology
  • Cell Biology
  • Adaptive Immunity

Background:

  • CD4 T cells are crucial for adaptive immunity.
  • Cell cooperation plays a vital role in immune responses.
  • Understanding T cell interactions is key to immune regulation.

Purpose of the Study:

  • To present evidence for cooperation among CD4 T cells with differing specificities.
  • To elucidate the molecular basis and functional significance of Th-Th cooperation.
  • To propose a model for Th-Th cooperation in self/non-self discrimination and tolerance.

Main Methods:

  • Review of existing evidence on CD4 T cell cooperation.
  • Analysis of molecular mechanisms underlying Th-Th interactions.
  • Discussion of functional outcomes in anti-tumor immunity and autoimmunity.

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Main Results:

  • Evidence supports cooperation between CD4 T cells of distinct specificities.
  • Th-Th cooperation has significant molecular and functional implications.
  • This cooperation is implicated in both anti-tumor responses and the generation of autoimmunity.

Conclusions:

  • Th-Th cooperation is a key mechanism in adaptive immunity.
  • It plays a dual role in promoting protective immunity and preventing autoimmunity.
  • A proposed model suggests Th-Th cooperation underlies self/non-self discrimination and peripheral tolerance.