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CD4+ Helper T Cells Script Adaptive Immunity Frédérick Masson1, Gabrielle T Belz1

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CD4+ Helper T Cells Script Adaptive Immunity Frédérick Masson1, Gabrielle T Belz1 Cell Research (2010) 20:1-3. npg © 2010 IBCB, SIBS, CAS All rights reserved 1001-0602/10 $ 32.00 RESEARCH HIGHLIGHT www.nature.com/cr Mobilizing forces - CD4+ helper T cells script adaptive immunity Frédérick Masson1, Gabrielle T Belz1 1Division of Immunology, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Melbourne, Victoria 3052, Australia Cell Research (2010) 20:1-3. doi:10.1038/cr.2010.1; published online 4 January 2010 Traditionally, CD4+ T cells have differentiated ‘killer’ (or effector) and help (‘helper-dependent’) to ensure the been understood to play a key role in memory CD8+ T cells. CD8+ T cells full complement of signals that would ‘helping’ CD8+ T cells undergo efficient differentiate into effector and memory normally be provided in an intensely activation and proliferation in response cells following the recognition of anti- inflammatory response. Precisely what to foreign pathogens. This has been genic peptides loaded onto class I Major those signals are has been less clear. thought to be directed primarily by Histocompatibility Complex (MHC) One widely accepted model centres CD4+ T cell interactions with dendritic molecules displayed on the surface of on the ability of helper CD4+ T cells to cells (DCs) [1, 2] that convert ‘unli- specialized antigen presenting cells ‘license’ DCs for CD8+ T cell priming. cenced’ DCs into DCs capable of imple- (APCs) called DCs. In addition, CD8+ This process depends on the interaction menting a full blown immune response T cells need to receive ‘costimulatory’ of the costimulatory receptors, such (‘licenced’ DCs). More recently it has signals to differentiate into fully func- as CD40 expressed by the DC, and emerged that even when CD4+ T cell tional effector and memory cells. This CD40L (CD154) expressed by CD4+ help appears not to be essential for the can be provided either by direct ligation T cells (Figure 1) [1, 2]. Once DCs first wave of effector ‘killer’ cytotoxic of the costimulatory receptors with have been modified in the licencing CD8+ T lymphocytes (CTL) to fight their ligands expressed on the surface process (e.g. induction of maturation) infection, it is crucial in order for killer of DCs, or by soluble factors secreted they are then able to efficiently convert CD8+ T cells to acquire the ability to mainly by DCs and ‘helper’ CD4+ T naïve CD8+ T cells into fully competent form memory cells capable of protect- cells. This process is necessary to form cytotoxic T cells. Cognate recognition ing the body [3-5]. In a further extension protective memory CD8+ T cells that are of the same DC-displaying antigen by of the importance of CD4+ T cells, a able to survive for long periods of time the CD4+ and CD8+ T cell is necessary paper recently published in Nature by in the body poised to rapidly respond to complete this “ménage à trois” [7]. Nakanishi et al. [6] now paints an even to a second encounter with the foreign By contrast, CD4 help appears to be broader picture of the pivotal role of pathogen. redundant in situations where viruses, CD4+ T cells in laying the foundation of The concept of CD4+ T cell help such as influenza, induce sufficient in- the immune response. In an unexpected initially emerged from studies dem- flammation providing licencing signals twist, Nakanishi et al. [6] found that it onstrating that successful priming of most likely through Toll-Like Receptor was CD4+ T cell signals that provide CTL depends on the presence of CD4+ activation of DCs [8, 9]. We, and others, the roadmap to guide effector CD8+ T T cells. These studies partitioned the extended this concept of CD4 help when cells to infected tissues where they can need for helper functions based on the it was discovered that CD4+ T cells not destroy infected cells. level of inflammation driving the im- only were important for initial prim- Immune responses against pathogens mune response. Weak inflammatory ing of helper-dependent CD8+ T cell depend in part on the generation of fully settings such as allograft transplanta- responses, but also played a critical role tion, challenge with model antigens in programming CD8+ T cell memory or poorly replicating virus (such as development (Figure 1) [3, 5, 10]. + Correspondence: Gabrielle T Belz herpes simplex virus (HSV)) infection CD4 T cells are a strategic target Tel: +61-3-9345-2544 that induce minimal tissue damage for several viral pathogens (including E-mail: [email protected] were considered to require CD4+ T cell human immunodeficiency virus). By npg 2 focusing on this cell type, these patho- ing machinery of effector CD8+ T cells, cells to ensure efficient effector CD8+ T gens have been able to cripple effective distinct from the signals induced in the cell recruitment depend mainly on the anti-viral immunity and gained a signifi- licensing process. Without this, effector IFN-γ secreted by CD4+ T cells at the cant advantage in establishing persistent CD8+ T cells cannot correctly localize effector site itself. This, in turn, switches infection. One mechanism by which to and kill virally-infected cells. In a on the expression of the chemokines the virus might evade the CD8+ T cell mouse model of genital HSV-2 infec- CXCL9 and CXCL10, which forms a response could be attributable to CD4+ tion, Nakanishi et al. [6] asked whether chemotactic gradient within the vaginal T cells simply failing to prime CD8+ T part of the helper function of CD4+ T microenvironment (potentially medi- cells to be effective killers through poor cells is to guide activated CD8+ T cells ated by the vaginal epithelial cells). DC licencing. The study presented by to the effector site (the vaginal mucosa) CD8+ T cells primed during HSV-2 Nakanishi et al. [6], however, suggests a where they can deliver their lethal blow infection express high levels of the new dimension where CD4+ T cells play to virally-infected cells. They elegantly chemokine receptor CXCR3, and this a role in actually hard-wiring the hom- show that the cues provided by CD4+ T enables them to rapidly respond to the A B Lymph node priming Effector tissue Type I IFN pDC CD4 ? DC CD40 CD40L CD8 IL-2 CD4 Activation/ CXCR3 Tissue-resident DCs? Proliferation Inflammatory DCs? IFNγ CD8 CXCL10 DC licensing/ Memory programming CXCL9 Epithelial cells CD8 CD8+ T cell recruitment Figure 1 The multi-dimensional roles of CD4+ T cell ‘help’ orchestrate CD8+ T cell immune responses beyond licencing DCs in the lymph node. (A) DC licencing/programming. Mucosa-derived DCs migrate to the lymph node draining the site of infec- tion and mature by upregulating costimulatory molecules and MHC class II-antigen complexes so they can activate naïve T cells. CD4+ T cells ‘license’ LN-resident DCs through complementary interactions between CD40L and its receptor CD40. This leads to the full maturation of the DCs which are then capable of efficiently priming naïve CD8+ T cells. Activated CD4+ T cells synthesize an array of cytokines including IL-2 that are critical to optimally initiate the antigen-specific CD8+ T cell dif- ferentiation program allowing the formation of potent effector and memory cells, which must then find their way to the effec- tor site, spleen or other non-lymphoid tissues. These cytokines can also potentially recruit additional cell types critical to the immune response into the lymph nodes. (B) Instructional recruitment to the effector site. Activated CD4+ T cells migrate to the effector site guided by components of the inflammatory milieu (perhaps including type I IFN) and interact with local APCs (such as tissue-resident DCs or inflammatory DCs) displaying MHC II molecules loaded with pathogen peptides. This interac- tion leads to secretion of IFN-γ by activated CD4+ T cells and in turn switches on the secretion of the chemokines CXCL9 and CXCL10 by epithelial cells. The resultant chemokine gradient guides cytotoxic CD8+ T cells expressing the chemokine recep- tor CXCR3 to the effector site where they can destroy pathogen infected cells. Cell Research | Vol 20 No 1 | January 2010 npg 3 chemokines CXCL9 and CXCL10 and was impaired implying that type I IFNs is mediated by CD40-CD40L interac- efficiently migrate to the infected tissue was a key player in the process. One tions. Nature 1998; 393:480-483. (Figure 1). subset of DCs, the plasmacytoid DC 3 Belz GT, Wodarz D, Diaz G, Nowak MA, Doherty PC. Compromised influ- This work raises several important (pDC), is an important source of type enza virus-specific CD8+-T-cell memory questions about precisely how key play- I IFNs in inflamed peripheral tissues. in CD4+-T- cell-deficient mice. J Virol ers in the immune response are directed pDCs are considered to be essential to 2002; 76:12388-12393. to coordinate the immunological stage. some viral infections, but the function 4 Janssen EM, Lemmens EE, Wolfe T, et A central finding of this study is that of pDC-derived IFNα has not been al. CD4+ T cells are required for sec- temporal localization of CD4+ T cells determined. Perhaps pDCs participate ondary expansion and memory in CD8+ to the infected vaginal tissues preceded in optimizing CD4+ T cell recruitment T lymphocytes. Nature 2003; 421:852- the migration of CD8+ T cells. The key through liberation of IFNα. 856. + 5 Sun JC, Bevan MJ. Defective CD8 T mechanisms regulating CD4 T cell In conclusion, the study of Nakanishi cell memory following acute infection recruitment and subsequent retention et al. has uncovered a new dimension without CD4 T cell help. Science 2003; at the effector site were not addressed to the CD4+ T cell ‘help’ paradigm. 300:339-342.
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