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Chemotactic Migration of T Cells towards Dendritic Cells Promotes the Detection of Rare Antigens

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  • Renske M A Vroomans
  • Athanasius F M Marée
  • Rob J de Boer
  • Joost B Beltman

Abstract

In many immunological processes chemoattraction is thought to play a role in guiding cells to their sites of action. However, based on in vivo two-photon microscopy experiments in the absence of cognate antigen, T cell migration in lymph nodes (LNs) has been roughly described as a random walk. Although it has been shown that dendritic cells (DCs) carrying cognate antigen in some circumstances attract T cells chemotactically, it is currently still unclear whether chemoattraction of T cells towards DCs helps or hampers scanning. Chemoattraction towards DCs could on the one hand help T cells to rapidly find DCs. On the other hand, it could be deleterious if DCs become shielded by a multitude of attracted yet non-specific T cells. Results from a recent simulation study suggested that the deleterious effect dominates. We re-addressed the question whether T cell chemoattraction towards DCs is expected to promote or hamper the detection of rare antigens using the Cellular Potts Model, a formalism that allows for dynamic, flexible cellular shapes and cell migration. Our simulations show that chemoattraction of T cells enhances the DC scanning efficiency, leading to an increased probability that rare antigen-specific T cells find DCs carrying cognate antigen. Desensitization of T cells after contact with a DC further improves the scanning efficiency, yielding an almost threefold enhancement compared to random migration. Moreover, the chemotaxis-driven migration still roughly appears as a random walk, hence fine-tuned analysis of cell tracks will be required to detect chemotaxis within microscopy data. Author Summary: T lymphocytes are important actors of the immune system that find and kill infected cells. Before a T cell can mount such an immune response, it has to be activated through contact with a dendritic cell (DC) carrying antigen relevant to the specificity of the T cell receptor. This process typically takes place in secondary lymphoid organs such as lymph nodes and spleen, where DCs scan many T cells at a time. However, the fraction of T cells specific for any antigen is about –, and therefore establishing a contact between a DC carrying cognate antigen and the correct T cells seems quite a challenge. Here, we show with a computational model that despite the presence of millions of competing non-specific T cells, the probability of such a cognate interaction greatly increases when DCs produce a chemokine ligand to attract T cells. The scanning process becomes even more efficient when T cells become insensitive to the chemokine after contacting the DC. These findings oppose the earlier notion that chemoattraction is counterproductive due to blocking of DCs by T cells of irrelevant specificities.

Suggested Citation

  • Renske M A Vroomans & Athanasius F M Marée & Rob J de Boer & Joost B Beltman, 2012. "Chemotactic Migration of T Cells towards Dendritic Cells Promotes the Detection of Rare Antigens," PLOS Computational Biology, Public Library of Science, vol. 8(11), pages 1-13, November.
  • Handle: RePEc:plo:pcbi00:1002763
    DOI: 10.1371/journal.pcbi.1002763
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    1. René F M van Oers & Elisabeth G Rens & Danielle J LaValley & Cynthia A Reinhart-King & Roeland M H Merks, 2014. "Mechanical Cell-Matrix Feedback Explains Pairwise and Collective Endothelial Cell Behavior In Vitro," PLOS Computational Biology, Public Library of Science, vol. 10(8), pages 1-14, August.
    2. Edward J Banigan & Tajie H Harris & David A Christian & Christopher A Hunter & Andrea J Liu, 2015. "Heterogeneous CD8+ T Cell Migration in the Lymph Node in the Absence of Inflammation Revealed by Quantitative Migration Analysis," PLOS Computational Biology, Public Library of Science, vol. 11(2), pages 1-20, February.

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