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Blood, 1 September 2008, Vol. 112, No. 5, pp. 1759-1766. Prepublished online as a Blood First Edition Paper on June 20, 2008; DOI 10.1182/blood-2008-04-151068. This Article Full Text Full Text (PDF) Supplemental Figures All Versions of this Article: blood-2008-04-151068v1 112/5/1759    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Lalli, P. N. Articles by Heeger, P. S. Search for Related Content PubMed PubMed Citation Articles by Lalli, P. N. Articles by Heeger, P. S. Related Collections Immunobiology Related Article in Blood Online Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  IMMUNOBIOLOGY Locally produced C5a binds to T cell–expressed C5aR to enhance effector T-cell expansion by limiting antigen-induced apoptosis Peter N. Lalli1,2, Michael G. Strainic2, Min Yang3, Feng Lin2, M. Edward Medof2, and Peter S. Heeger13 1 Department of Immunology, Cleveland Clinic, OH; 2 Department of Pathology, Case Western Reserve University, Cleveland, OH; and 3 Department of Medicine, Mount Sinai School of Medicine, New York, NY Our recent studies have shown that immune cell–produced complement provides costimulatory and survival signals to naive CD4+ T cells. Whether these signals are similarly required during effector cell expansion and what molecular pathways link locally produced complement to T-cell survival were not clarified. To address this, we stimulated monoclonal and polyclonal T cells in vitro and in vivo with antigen-presenting cells (APCs) deficient in the complement regulatory protein, decay accelerating factor (DAF), and/or the complement component C3. We found that T-cell expansion induced by DAF-deficient APCs was augmented with diminished T-cell apoptosis, whereas T-cell expansion induced by C3–/– APCs was reduced because of enhanced T-cell apoptosis. These effects were traced to locally produced C5a, which through binding to T cell–expressed C5aR, enhanced expression of Bcl-2 and prevented Fas up-regulation. The results show that C5aR signal transduction in T cells is important to allow optimal T-cell expansion, as well as to maintain naive cell viability, and does so by suppressing programmed cell death. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? Related Article in Blood Online: Complement dances with T cells M. Javeed Ansari and Mohamed H. Sayegh Blood 2008 112: 1551-1552. [Full Text] [PDF]

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