Related Experiment Videos
Regulation of CD4+ T cell differentiation
T Nakamura1, M Rincón, Y Kamogawa
1Yale University School of Medicine, New Haven, CT 06520-8011, USA.
Ciba Foundation Symposium
|January 1, 1995
Summary
Naive T cells differentiate into Th1 and Th2 cells, activating transcription factors like AP-1. Reporter mice revealed distinct AP-1 activation signals are needed for naive versus effector T cells.
Area of Science:
- Immunology
- Molecular Biology
- Cellular Biology
Background:
- Naive T cells differentiate into distinct effector subsets, such as T helper 1 (Th1) and T helper 2 (Th2) cells.
- This differentiation process involves the activation of specific transcription factors, including Activator Protein-1 (AP-1).
Purpose of the Study:
- To investigate the signaling pathways regulating the activation of the transcription factor AP-1 during T cell differentiation.
- To characterize the differential requirements for AP-1 activation in naive T cells compared to effector T cells.
Main Methods:
- Development of reporter transgenic mice to monitor AP-1 activity.
- Stimulation of T cells using various signals, including diacylglycerol analogues, Ca2+ ionophores, and co-stimulatory molecules.
Main Results:
- Naive T cells require two distinct signals for AP-1 activation.
- Effector T cells can activate AP-1 with a single signal (diacylglycerol analogues).
- Rested effector cells lose accumulated AP-1 and require both Ca2+ and diacylglycerol signals for re-induction, independent of co-stimulation.
Conclusions:
- The signaling requirements for AP-1 activation change dynamically as T cells differentiate from naive to effector states.
- Understanding these distinct activation pathways is crucial for controlling T cell responses in immunity and disease.