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Antigen-specific T helper cell function: differential cytokine expression in primary and memory responses
J F Panus1, L J McHeyzer-Williams, M G McHeyzer-Williams
1Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710, USA.
The Journal of Experimental Medicine
|November 9, 2000
Summary
This study reveals that while T helper cells develop functional potential after initial antigen exposure, their specialized functions are differentially regulated during primary and memory immune responses.
Area of Science:
- Immunology
- Cellular immunology
- T cell biology
Background:
- Distinguishing functional potential development from in vivo function delivery in T helper (Th) cells is challenging.
- Understanding Th cell responses to antigens like pigeon cytochrome c (PCC) is crucial for immunology.
Purpose of the Study:
- To quantify cytokine-producing cells in primary and memory Th cell responses to PCC.
- To investigate the regulation of Th cell functional potential and in vivo cytokine delivery.
Main Methods:
- In vitro and ex vivo analysis of primary and memory B10.BR Th cell responses to PCC.
- Quantification of cytokine production (IL-2, TNF-alpha, IL-4, IFN-gamma, IL-10).
- T cell receptor beta chain sequencing of specific Th cell populations.
Main Results:
- No Th1/Th2 cytokine polarity observed in vitro during the primary response peak.
- Limited preservation of cytokine production potentials into the memory compartment in vitro.
- In vivo cytokine expression is staggered in primary responses and coordinate in memory responses.
- Memory responders showed increased frequencies of IL-2, TNF-alpha, IFN-gamma, and IL-10 compared to primary, but lower than in vitro.
- Early functional commitment observed among clonal progeny of IL-4 and TNF-alpha-expressing Th cells.
Conclusions:
- Functional potential development in Th cells is driven by initial antigen experience.
- In vivo delivery of specialized Th cell functions is differentially regulated between primary and memory responses.
- T cell receptor analysis suggests early functional commitment within Th cell clones.