Document Detail

Cell division curtails helper phenotype plasticity and expedites helper T-cell differentiation.
MedLine Citation:
PMID:  22565392     Owner:  NLM     Status:  Publisher    
Following activation by antigen, helper T cells differentiate into one of many effector phenotypes. Formulating mechanistic mathematical models combining regulatory networks at the transcriptional, translational and epigenetic level, we study how individual helper T cells may adopt their different phenotypes. For each cytokine phenotype, for example, T helper type 1 (Th1) and type 2 (Th2) cells, we find that the intracellular molecular network allows a cell to adopt one of the three states, which we interpret as naive, active and memory states. Cell division markedly speeds up the differentiation into a particular memory state because of DNA demythelation. In a memory state, cells readily resume production of the same cytokine they produced before. Using stochastic models we show that helper T-cell plasticity (that is, the ability to switch phenotype) is low during clonal expansion. Although most memory cells rapidly secrete the original cytokine upon restimulation, some adopt another phenotype and produce different cytokines, allowing for considerable diversity in the phenotypes that are adopted during a memory response. In summary, we show that helper T-cell division expedites cell differentiation by increasing DNA demethylation. We also show that plasticity is low during the clonal expansion phase, but that helper T cells may adopt alternative phenotypes during a memory response.Immunology and Cell Biology advance online publication, 8 May 2012; doi:10.1038/icb.2012.23.
Henk Jan van den Ham; Rob J de Boer
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-08
Journal Detail:
Title:  Immunology and cell biology     Volume:  -     ISSN:  1440-1711     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8706300     Medline TA:  Immunol Cell Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1] Theoretical Biology and Bioinformatics, Utrecht University, Utrecht, The Netherlands [2] Department of Virology, Erasmus Medical Center, Rotterdam, The Netherlands.
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