The Journal of Experimental Medicine
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Published online 27 February 2006 doi:10.1084/jem.20051474
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 203, Number 3, 619-631
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ARTICLE

 Natural killer cell behavior in lymph nodes revealed by static and real-time imaging

Marc Bajénoff1, Béatrice Breart2, Alex Y.C. Huang3, Hai Qi3, Julie Cazareth1, Veronique M. Braud2, Ronald N. Germain3, and Nicolas Glaichenhaus1

1 Institut National de la Santé et de la Recherche Médicale, Université de Nice-Sophia Antipolis, E03-44, 06560 Valbonne, France
2 Centre National de la Recherche Scientifique, Université de Nice-Sophia Antipolis, UMR6097, 06560 Valbonne, France
3 Lymphocyte Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892

CORRESPONDENCE Marc Bajénoff: bajenoff{at}ipmc.cnrs.fr

Natural killer (NK) cells promote dendritic cell (DC) maturation and influence T cell differentiation in vitro. To better understand the nature of the putative interactions among these cells in vivo during the early phases of an adaptive immune response, we have used immunohistochemical analysis and dynamic intravital imaging to study NK cell localization and behavior in lymph nodes (LNs) in the steady state and shortly after infection with Leishmania major. In the LNs of naive mice, NK cells reside in the medulla and the paracortex, where they closely associate with DCs. In contrast to T cells, intravital microscopy revealed that NK cells in the superficial regions of LNs were slowly motile and maintained their interactions with DCs over extended times in the presence or absence of immune-activating signals. L. major induced NK cells to secrete interferon-{gamma} and to be recruited to the paracortex, where concomitant CD4 T cell activation occurred. Therefore, NK cells form a reactive but low mobile network in a strategic area of the LN where they can receive inflammatory signals, interact with DCs, and regulate colocalized T cell responses.

M. Bajénoff and B. Breart contributed equally to this work.

Abbreviations used: 2-P, two photon; EGFP, enhanced GFP; HEV, high endothelial venule; LN, lymph node; PNAd, peripheral node addressin.


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