Related Experiment Videos
How instruction and feedback can select the appropriate T helper response
Claudia Bergmann1, J Leo van Hemmen, Lee A Segel
1Department of Virology, Erasmus University Rotterdam, NL-3015 GE Rotterdam, The Netherlands. bergmann@viro.fgg.eur.nl
Bulletin of Mathematical Biology
|July 4, 2002
Summary
The immune system
Area of Science:
- Immunology
- Mathematical Biology
- Computational Immunology
Background:
- Immune system decisions between Th1 and Th2 responses critically impact disease outcomes.
- The intrinsic dynamics of the T helper system often govern these crucial immune responses.
- Rapidly replicating or immune-evasive pathogens may necessitate additional stimuli beyond intrinsic T helper behavior.
Purpose of the Study:
- To present an enlarged mathematical model incorporating innate immune signals into Th1-Th2-pathogen interactions.
- To analyze the fault-tolerance of the T helper system to incorrect immune signals.
- To investigate the role of feedback mechanisms and innate immune recognition in guiding T helper cell differentiation.
Main Methods:
- Development and analysis of an enlarged mathematical model of T helper cell (Th1/Th2) dynamics.
- Incorporation of signals from innate immune recognition of pathogens.
- Simulation of immune responses under various signaling conditions, including incorrect Th1 and Th2 stimuli.
Main Results:
- The T helper system exhibits fault-tolerance to incorrect Th1 signals, with intrinsic dynamics capable of shifting responses towards a correct Th2-dominated outcome.
- No fault-tolerance was observed for incorrect Th2 signals; intrinsic dynamics can automatically switch to Th2 if Th1 fails.
- Th2 signals may be crucial for accelerating the onset of the Th2 response, and feedback mechanisms (e.g., CpG motifs) can up-regulate effective T helper types upon pathogen destruction.
Conclusions:
- The intrinsic dynamics of the T helper system play a significant role in immune decision-making, demonstrating robustness to certain signal errors.
- Innate immune recognition and feedback loops are essential for fine-tuning and ensuring appropriate immune responses, particularly against challenging pathogens.
- Understanding these mechanisms provides insights into immune regulation and potential therapeutic strategies for infectious diseases.