T Cell Activation by CD1 and Lipid Antigens PDF Download

Author: Branch D. Moody
Publisher: Springer Science & Business Media
ISBN: 3540695117
Category : Medical
Languages : en
Pages : 346

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Book Description
There is increasing evidence that the CD1 system has been conserved throughout mammalian evolution and is capable of presenting structurally diverse diacyglycerol, sphingolipid, polyisoprenol and lipopeptide antigens. This volume provides a comprehensive discussion of these basic aspects of CD1 biology and summarizes the most recent research into the role of CD1 in infectious, autoimmune, allergic and neoplastic disease.

Author: Kazuya Iwabuchi
Publisher: Frontiers Media SA
ISBN: 2889631222
Category :
Languages : en
Pages : 429

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Book Description
CD1 and MR1 are major histocompatibility complex (MHC) class I-related proteins that bind and present non-peptide antigens to subsets of T cells with specialized functions. CD1 proteins typically present lipid antigens to CD1-restricted T cells, whereas MR1 presents vitamin B-based ligands and a variety of drugs and drug-like molecules to MR1-restricted T cells. The CD1 family of antigen presenting molecules has been divided into two groups: Group 1 contains CD1a, CD1b and CD1c, and Group 2 contains CD1d. Additionally, CD1e is expressed intracellularly and is involved in the loading of lipid antigens onto Group 1 CD1 proteins. Humans express both Groups 1 and 2 CD1 proteins, whereas mice only express CD1d. Group 1 CD1 proteins present lipid antigens to T cells that generally express diverse T cell receptors (TCRs) and exhibit adaptive-like functions, whereas CD1d presents lipid antigens to subsets of T cells that express either diverse or highly restricted TCRs and exhibit innate-like functions. CD1d-restricted T cells are called natural killer T (NKT) cells, which includes Type I or invariant NKT (iNKT) cells expressing semi-invariant TCRs, and Type II NKT cells expressing more diverse TCRs. CD1-restricted T cells have been implicated in a wide variety of diseases, including cancer, infections, and autoimmune, inflammatory and metabolic diseases. Additionally, NKT cells have been targeted for immunotherapy of disease with ligands such as α-galactosylceramide for iNKT cells, or sulfatide for Type II NKT cells. Like iNKT cells, MR1-restricted T cells express semi-invariant TCRs and display innate-like functions. MR1-restricted T cells, also called mucosal-associated invariant T (MAIT) cells, have been implicated in immune responses against a variety of pathogens such as Mycobacterium tuberculosis, Pseudomonas aeruginosa, Helicobacter pylori, hepatitis C virus and influenza virus. Moreover, these cells contribute to autoimmune and inflammatory diseases, including colitis, rheumatoid arthritis, psoriasis, lupus, and diabetes.

Author: S.M. Mansour Haeryfar
Publisher: Frontiers Media SA
ISBN: 2889197506
Category : Cytology
Languages : en
Pages : 191

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Book Description
Cell-mediated immunity to extracellular and intracellular microbes has been traditionally linked to CD4+ and CD8+ T cells that recognize pathogen-derived peptides in the context of major histocompatibility complex (MHC) class II and class I molecules, respectively. Recent progress in our understanding of early host defense mechanisms has brought ‘unconventional’, innate-like T cells into the spotlight. These are a heterogeneous population of non-MHC-restricted T cells that exhibit ‘memory-like’ properties and mount emergency responses to infection. They may directly detect and destroy infected cells, but are best known for their ability to regulate downstream effector cells including but not limited to conventional T cells. Innate-like T cells include among others CD1-restricted natural killer T (NKT) cells and MR1-restricted mucosa-associated invariant T (MAIT) cells. NKT cells recognize lipid antigens, and MAIT cells were recently demonstrated to respond to microbe-derived vitamin B metabolites. However, much remains to be learned about the antigen specificity range of these cells, their activation mode and their true potentials in immunotherapeutic applications. Like in many other areas of biology, uncertainties and controversies surrounding these cells and some of the experimental models, techniques and reagents employed to study them have brought about excitement and sometimes hot debates. This Special Topic was launched to provide updated reviews on protective and/or pathogenic roles of NKT and MAIT cells during infection. Leading experts discuss current controversies, pressing questions and the challenges that lie ahead for the advancement of this intriguing and rapidly evolving area of immunology. Unlike MHC, CD1 and MR1 display very limited polymorphism. Therefore, NKT and MAIT cells may be considered attractive targets for various diseases in diverse human populations. The potential benefits of NKT cell- and MAIT cell-based vaccination and treatment strategies in infectious diseases is an important subject that is also covered in this Topic.

Author:
Publisher: ScholarlyEditions
ISBN: 1481634976
Category : Medical
Languages : en
Pages : 21

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Book Description
CD1 Antigens—Advances in Research and Application: 2012 Edition is a ScholarlyPaper™ that delivers timely, authoritative, and intensively focused information about CD1 Antigens in a compact format. The editors have built CD1 Antigens—Advances in Research and Application: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about CD1 Antigens in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of CD1 Antigens—Advances in Research and Application: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Author: Kenneth Murphy
Publisher: Garland Science
ISBN: 9780815344575
Category : Medical
Languages : en
Pages :

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Book Description
The Janeway's Immunobiology CD-ROM, Immunobiology Interactive, is included with each book, and can be purchased separately. It contains animations and videos with voiceover narration, as well as the figures from the text for presentation purposes.

Author: Jonathan Soboloff
Publisher: CRC Press
ISBN: 149870509X
Category : Medical
Languages : en
Pages : 258

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Book Description
T cells play a vital role mediating adaptive immunity, a specific acquired resistance to an infectious agent produced by the introduction of an antigen. There are a variety of T cell types with different functions. They are called T cells, because they are derived from the thymus gland. This volume discusses how T cells are regulated through the operation of signaling mechanisms. Topics covered include positive and negative selection, early events in T cell receptor engagement, and various T cell subsets.

Author: Elisabetta Padovan
Publisher: Frontiers Media SA
ISBN: 288919907X
Category : Immunologic diseases. Allergy
Languages : en
Pages : 145

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Book Description
Long-lasting T cell immunity is delivered by an array of individual T lymphocytes expressing clonally distributed and highly specific antigen receptors recognizing an almost infinite number of antigens that might enter in contact with the host. Following antigen-specific priming in lymphnodes, naïve CD4 and CD8 T lymphocytes proliferate generating clones of effector cells that migrate to peripheral tissues and deliver unique antigen-specific effector functions. Moreover, a proportion of these effector lymphocytes survive as memory T cells that can be rapidly mobilized upon new exposure to the same antigen, even years after their primary induction. Innate immune cells play crucial roles in the induction and maintenance of this efficient protection system. Following the seminal discovery of Steinman and Cohen in 1974 describing a rare cell type capable of initiating antigen-specific responses in lymphnodes, Dendritic Cells (DC) have taken up the stage for several decades as professional Antigen Presenting Cells (APC). Although DC possess all attributes to prime naïve T lymphocytes, other immune cell subsets become crucial accessory cells during secondary and even primary activation. For instance, Monocytes (Mo) are rapidly recruited to inflammatory sites and have recently been recognized as capable of shaping T cell immunity, either directly through Ag presentation, or indirectly through the secretion of soluble factors. In addition, upon sensing of T cell-derived cytokines, Mo differentiate into functionally different APC types that further impact on the quality and persistence of memory T cell responses in peripheral tissues. Other innate immune cells, including Myeloid Derived Suppressor Cells, Granulocytes and iNKT lymphocytes, are known to modulate T cell activation by interacting with and modifying the function of professional APC. Notably, innate immune cell determinants also account for the tissue-specific regulation of T cell immunity. Hence, the newly discovered family of Innate Lymphoid Cells, has been recognized to shape CD4+ T cell responses at mucosal surfaces. Although the actions of innate immune cells fulfills the need of initiating and maintaining protective T cell responses, the excessive presence or activity of individual determinants may be detrimental to the host, because it could promote tissue destruction as in autoimmunity and allergy, or conversely, prevent the induction of immune responses against malignant tissues, and even modulate the response to therapeutic agents. Thus, understanding how defined innate immune cell subsets control T cell immunity is of fundamental relevance to understand human health, and of practical relevance for preventing and curing human diseases. In this research topic, we intend to provide an excellent platform for the collection of manuscripts addressing in depth how diverse innate immune cell subsets impact on T cell responses through molecularly defined pathways and evaluating the rational translation of basic research into clinical applications.

Author: Ari Waisman
Publisher: Humana
ISBN: 9781493946457
Category : Medical
Languages : en
Pages : 0

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Book Description
T-Helper Cells: Methods and Protocols presents a broad selection of cutting edge protocols that will enable the reader to capture the unique features of TH cells with tools developed for the isolation of TH cells from various tissues and subsequent analysis of their functional properties in vitro, ex vivo and in vivo. Chapters cover methods of isolating T cells from various tissues in mice, protocols for the analysis of T cell function and phenotype using various cutting edge technologies, methods allowing for the manipulation of T cell function in vitro and in vivo and in vivo models of diseases in which T cells play a central role in the pathogenesis. Written in the successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols, and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, T-Helper Cells: Methods and Protocols seeks to serve both professionals and novices with its well-honed methodologies in an effort to further the study of this amazingly versatile and potent cell type.

Author: Frederick W. Alt
Publisher: Academic Press
ISBN: 0080951023
Category : Medical
Languages : en
Pages : 304

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Book Description
Advances in Immunology, a long-established and highly respected publication, presents current developments as well as comprehensive reviews in immunology. Articles address the wide range of topics that comprise immunology, including molecular and cellular activation mechanisms, phylogeny and molecular evolution, and clinical modalities. Edited and authored by the foremost scientists in the field, each volume provides up-to-date information and directions for future. Contributions from leading authorities and industry experts Informs and updates on all the latest developments in the field

Author: Charlotte A. James
Publisher:
ISBN:
Category :
Languages : en
Pages : 122

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Book Description
Tuberculosis (TB) is of high global health importance and disproportionately affects individuals in resource-limited settings. A major challenge to reducing the global burden of this disease is the lack of effective vaccines and diagnostics. At present, the intricacies of the immune response to this disease are not understood well enough to rationally develop efficacious vaccines. Peptide-specific T cells have been implicated as a critical component of the immune response to TB. However, there are few studies that investigate the role of T cells that recognize non-peptide antigens in the immune response to TB. T cells can recognize lipid antigens presented by CD1 molecules, but how these antigens are recognized and the impact that antigen recognition has on lipid-specific T cell activation and functional differentiation is not understood. Here, we elucidate the molecular and cellular factors that affect lipid antigen recognition by human T cells, and what impact these factors have on T cell activation and function. This work focused on a family of mycobacterial lipids, diacylated sulfoglycolipids (Ac2SGL), which are only expressed by virulent strains of Mycobacterium tuberculosis, the causative agent of TB. The first aim of this work utilized synthetic Ac2SGL analogs, a panel of T cell clones, and antigen presenting cells that express mutated CD1 molecules to probe the specificity with which these antigens are recognized by T cells to inform which molecular moieties are essential for Ac2SGL recognition by T cells. The second aim investigated the impact of T cell receptor co-receptors on antigen recognition at the cellular level, as this influences the magnitude of activation and functional differentiation of T cells. We found that co-receptors augmented T cell affinity for Ac2SGL and these molecules impact T cell function in vitro and ex vivo. Together, our data support an emerging model that related but chemically distinct antigens and T cell subpopulations should be studied independently to fully understand the T cell response to mycobacterial lipid antigens. As Ac2SGL holds promise as a target for novel vaccination and diagnostic strategies for TB, these studies will inform the development of tools to address these two major needs.