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Submitted on December 28, 2006
Accepted on February 8, 2007
Asymmetric T Lymphocyte Division in the Initiation of Adaptive Immune Responses
John T. Chang 1, Vikram R. Palanivel 1, Ichiko Kinjyo 1, Felix Schambach 1, Andrew M. Intlekofer 1, Arnob Banerjee 1, Sarah A. Longworth 1, Kristine E. Vinup 1, Paul Mrass 2, Jane Oliaro 3, Nigel Killeen 4, Jordan S. Orange 5, Sarah M. Russell 6, Wolfgang Weninger 2, Steven L. Reiner 1*
1 Abramson Family Cancer Research Institute and Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. 2 Immunology Program, The Wistar Institute, Philadelphia, PA 19104, USA. 3 Immune Signalling Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria 2002, Australia. 4 Department of Microbiology and Immunology, University of California, San Francisco, CA 94143, USA. 5 Department of Pediatrics, University of Pennsylvania, Philadelphia, PA 19104, USA. 6 Immune Signalling Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria 2002, Australia; Center for MicroPhotonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Victoria 3122, Australia.
* To whom correspondence should be addressed.
Steven L. Reiner , E-mail: sreiner{at}mail.med.upenn.edu
A hallmark of mammalian immunity is the heterogeneity of cellfate that exists among pathogen-experienced lymphocytes. Wenow show that a dividing T lymphocyte initially responding toa microbe exhibits unequal partitioning of proteins that mediatesignaling, cell fate specification, and asymmetric cell division.Asymmetric segregation of determinants appears to be coordinatedby prolonged interaction between the T cell and its antigen-presentingcell prior to division. Additionally, the first two daughterT cells displayed phenotypic and functional indicators of beingdifferentially fated toward effector and memory lineages. Theseresults suggest a mechanism in which a single lymphocyte canapportion diverse cell fates necessary for adaptive immunity.
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