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Histocompatibility

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https://www.readbyqxmd.com/read/28334733/mhc-class-i-chain-related-protein-a-and-b-mica-and-micb-are-predominantly-expressed-intracellularly-in-tumour-and-normal-tissue
#1
Hormas Ghadially, Lee Brown, Chris Lloyd, Leeanne Lewis, Arthur Lewis, Janette Dillon, Richard Sainson, Jelena Jovanovic, Natalie J Tigue, David Bannister, Lisa Bamber, Viia Valge-Archer, Robert W Wilkinson
BACKGROUND: Major histocompatibility complex (MHC) class I chain-related protein A (MICA) and MHC class I chain-related protein B (MICB) are polymorphic proteins that are induced upon stress, damage or transformation of cells which act as a 'kill me' signal through the natural-killer group 2, member D receptor expressed on cytotoxic lymphocytes. MICA/B are not thought to be constitutively expressed by healthy normal cells but expression has been reported for most tumour types. However, it is not clear how much of this protein is expressed on the cell surface...
March 23, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28333126/cheetahs-have-a-stronger-constitutive-innate-immunity-than-leopards
#2
Sonja K Heinrich, Heribert Hofer, Alexandre Courtiol, Jörg Melzheimer, Martin Dehnhard, Gábor Á Czirják, Bettina Wachter
As a textbook case for the importance of genetics in conservation, absence of genetic variability at the major histocompatibility complex (MHC) is thought to endanger species viability, since it is considered crucial for pathogen resistance. An alternative view of the immune system inspired by life history theory posits that a strong response should evolve in other components of the immune system if there is little variation in the MHC. In contrast to the leopard (Panthera pardus), the cheetah (Acinonyx jubatus) has a relatively low genetic variability at the MHC, yet free-ranging cheetahs are healthy...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28331308/highly-effective-photothermal-chemotherapy-with-ph-responsive-polymer-coated-drug-loaded-melanin-like-nanoparticles
#3
Chengwei Zhang, Xiaozhi Zhao, Suhan Guo, Tingsheng Lin, Hongqian Guo
Dopamine is a neurotransmitter commonly used in clinical treatment. Polydopamine (PDA) has excellent histocompatibility and biosafety and can efficiently convert near-infrared reflection (NIR) to thermal energy. In this study, PDA was used as a promising carrier, and pH-responsive polymer-coated drug-loaded PDA nanoparticles (NPs; doxorubicin@ poly(allylamine)-citraconic anhydride [Dox@PAH-cit]/PDA NPs) were developed. As expected, the Dox@PAH-cit/PDA NPs exhibited excellent photothermal efficiency. In addition, at a low pH condition, the loaded Dox was released from the NPs due to the amide hydrolysis of PAH-cit...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28329770/antigen-presentation-profiling-reveals-recognition-of-lymphoma-immunoglobulin-neoantigens
#4
Michael S Khodadoust, Niclas Olsson, Lisa E Wagar, Ole A W Haabeth, Binbin Chen, Kavya Swaminathan, Keith Rawson, Chih Long Liu, David Steiner, Peder Lund, Samhita Rao, Lichao Zhang, Caleb Marceau, Henning Stehr, Aaron M Newman, Debra K Czerwinski, Victoria E H Carlton, Martin Moorhead, Malek Faham, Holbrook E Kohrt, Jan Carette, Michael R Green, Mark M Davis, Ronald Levy, Joshua E Elias, Ash A Alizadeh
Cancer somatic mutations can generate neoantigens that distinguish malignant from normal cells. However, the personalized identification and validation of neoantigens remains a major challenge. Here we discover neoantigens in human mantle-cell lymphomas by using an integrated genomic and proteomic strategy that interrogates tumour antigen peptides presented by major histocompatibility complex (MHC) class I and class II molecules. We applied this approach to systematically characterize MHC ligands from 17 patients...
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28327848/-mesenchymal-stem-cells-definitions-culture-and-potential-applications
#5
Willy Ceron, Iván Lozada-Requena, Kiomi Ventocilla, Sandra Jara, Milagros Pinto, Marco Cabello, José L Aguilar
In recent years, mesenchymal stem cells (MSC) have become very important due to their high plasticity and their ability to release paracrine factors able to interact with various cell types, tissues and organs. The use of MSC in regenerative medicine became of vital importance, since they do not express histocompatibility MHC molecules class II nor costimulant molecules, and low expression of MHC class I, will not be rejected by individuals of same species, they could be used in an autologous, and eventually, allogeneic manner...
October 2016: Revista Peruana de Medicina Experimental y Salud Pública
https://www.readbyqxmd.com/read/28323998/genes-outside-the-major-histocompatibility-complex-mhc-locus-are-linked-to-the-development-of-thyroid-autoantibodies-and-thyroiditis-in-nod-h2h4-mice
#6
Sandra M McLachlan, Sylvie Lesage, Roxanne Collin, Bianca Banuelos, Holly A Aliesky, Basil Rapoport
Thyroiditis and autoantibodies to thyroglobulin (TgAb) and thyroid peroxidase (TPOAb) develop spontaneously in NOD.H2h4 mice, a phenotype enhanced by dietary iodine. NOD.H2h4 mice were derived by introducing the Major Histocompatibility Class (MHC) molecule I-Ak from B10.A(4R) mice to non-obese diabetic (NOD) mice. Apart from I-Ak, the genes responsible for the NOD.H2h4 phenotype are unknown. Extending serendipitous observations from crossing BALB/c to NOD.H2h4 mice, thyroid autoimmunity was investigated in both genders of the F1, F2 and the second generation backcross of F1 to NOD...
January 17, 2017: Endocrinology
https://www.readbyqxmd.com/read/28322797/transcriptional-activation-of-the-mica-gene-with-an-engineered-crispr-cas9-system
#7
Kazuma Sekiba, Mari Yamagami, Motoyuki Otsuka, Tatsunori Suzuki, Takahiro Kishikawa, Rei Ishibashi, Motoko Ohno, Masaya Sato, Kazuhiko Koike
Major histocompatibility complex class I polypeptide-related sequence A (MICA) is a prototypical NKG2D ligand. Because immune cells, such as natural killer (NK) cells, recognize virally infected or transformed cells and eliminate them through the interaction between NKG2D receptors on NK cells and NKG2D ligands on pathogenic cells, MICA expression levels are associated with NK cell-mediated immunity. Here, we report that an engineered clustered regularly interspaced short palindromic repeats-Cas9-related complex targeting MICA gene promoter sequences activates transcription of the MICA gene from its endogenous locus...
March 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28320532/atypical-histiocytosis-in-red-squirrels-sciurus-vulgaris
#8
S H Smith, K Stevenson, J Del-Pozo, S Moss, A Meredith
Four red squirrels (Sciurus vulgaris) were subjected to necropsy examination over a 3-year period as part of a broader surveillance study. The squirrels presented with cutaneous, subcutaneous and/or internal swellings and nodules that consisted microscopically of sheets of atypical round cells and multinucleated giant cells. There was moderate anisokaryosis with rare mitoses. Nuclei ranged from oval to indented or C-shaped and some were bizarre, twisted or multilobulated. Many giant cells also had a bizarre morphology, with anisokaryosis within individual cells...
March 17, 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28319565/bone-marrow-graft-versus-host-disease-in-major-histocompatibility-complex-matched-murine-reduced-intensity-allogeneic-hemopoietic-cell-transplantation
#9
Kifah Shahin, Zamil Mattar, Pablo Silveira, Wei-Hsun Hsu, Linda Bendall, Derek Hart, Kenneth F Bradstock
BACKGROUND: Most clinical allogeneic hemopoietic cell transplants (alloHCT) are now performed using reduced intensity conditioning (RIC) instead of myeloablative (MAC) conditioning, however, the biology underlying this treatment remains incompletely understood. METHODS: We investigated a murine model of major histocompatibility complex (MHC)-matched multiple minor histocompatibility antigen mismatched alloHCT, using bone marrow (BM) cells and splenocytes from B6 (H-2) donor mice transplanted into BALB...
March 18, 2017: Transplantation
https://www.readbyqxmd.com/read/28318800/autoimmune-disease-development-based-on-possible-mislocalization-of-intracellular-and-extracellular-proteins
#10
Borros Arneth
BACKGROUND: T helper cells can differentiate into several subsets of T lymphocytes, including Th1, Th2, and regulatory T (Treg) cells. As a result of this ability to differentiate, the corresponding T cell receptor (TCR) spectra display considerable cellular plasticity and interchangeability. In contrast, T lymphocyte differentiation and separation into CD4(+) and/or CD8(+) T cell lines creates stable populations over a person's lifetime, which abrogates the plasticity and interchange between these cell types and their corresponding TCR spectra but results in considerable stability regarding the corresponding TCR sequences and spectra...
February 27, 2017: Immunobiology
https://www.readbyqxmd.com/read/28317931/recruitment-of-bone-marrow-cd11b-gr-1-cells-by-polymeric-nanoparticles-for-antigen-cross-presentation
#11
Ya-Wun Yang, Wen-Hui Luo
The objective of this study was to investigate the function of poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) on the activation of antigen-specific CD8(+) T cell responses via the CD11b(+)Gr(-)1(+) myeloid subpopulations in murine bone marrow (BM). PLGA NPs containing ovalbumin (OVA) were fabricated by the double-emulsion method. The CD11b(+)Gr-1(low)Ly-6C(high) and CD11b(+)Gr-1(high)Ly-6C(low) subsets from mice bone marrow were sorted and treated with the PLGA/OVA NPs, followed by co-culture with the carboxyfluorescein succinimidyl ester (CFSE)-labelled OT-I CD8(+) cells...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28315676/the-major-histocompatibility-complex-class-iii-haplotype-ltab-ncr3-regulates-adjuvant-induced-but-not-antigen-induced-autoimmunity
#12
Anthony C Y Yau, Jonatan Tuncel, Rikard Holmdahl
Rheumatoid arthritis is a complex disease associated with >100 risk loci, with the strongest association from the major histocompatibility complex (MHC) region. Here, we analyzed a new genetic association in the MHC class-III region (MHC-III) using adjuvant- and antigen-induced arthritis models. In addition, we used models for multiple sclerosis for comparison and dissected the MHC-III-mediated mechanisms of importance for antibody and T-cell responses to antigens. With the use of a panel of MHC-III recombinant inbred strains, we found that the 33-kb Ltab-Ncr3 haplotype in MHC-III was linked to the induction of arthritis with incomplete Freund's adjuvant, with similar effects in arthritis induced by several oil adjuvants (hexadecane, heptadecane, squalene, arlacel)...
March 15, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28314956/evolution-of-mhc-based-technologies-used-for-detection-of-antigen-responsive-t-cells
#13
REVIEW
Amalie Kai Bentzen, Sine Reker Hadrup
T cell-mediated recognition of peptide-major histocompatibility complex (pMHC) class I and II molecules is crucial for the control of intracellular pathogens and cancer, as well as for stimulation and maintenance of efficient cytotoxic responses. Such interactions may also play a role in the development of autoimmune diseases. Novel insights into this mechanism are crucial to understanding disease development and establishing new treatment strategies. MHC multimers have been used for detection of antigen-responsive T cells since the first report by Altman et al...
March 17, 2017: Cancer Immunology, Immunotherapy: CII
https://www.readbyqxmd.com/read/28301281/cell-based-immunotherapy-with-cytokine-induced-killer-cik-cells-from-preparation-and-testing-to-clinical-application
#14
Yiming Meng, Zhifu Yu, Yefeng Wu, Tianzhao Du, Shi Chen, Fanjuan Meng, Nan Su, Yushu Ma, Xiaoxi Li, Sulan Sun, Guirong Zhang
Cell-based immunotherapy holds promise in the quest for the treatment of cancer, having potential synergy with surgery, chemotherapy and radiotherapy. As a novel approach for adoptive cell-based immunotherapy, cytokine-induced killer (CIK) cells have moved from the 'bench to bedside'. CIK cells are a heterogeneous subset of ex-vitro expanded, polyclonal T-effector cells with both natural killer (NK) and T-cell properties, which present potent non-major histocompatibility complex-restricted cytotoxicity against a variety of tumor target cells...
February 22, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28300283/immunology-and-genetics-of-tumour-necrosis-factor-in-allergic-contact-dermatitis
#15
REVIEW
Daan Dittmar, Marie Louise Schuttelaar
During the sensitization phase of allergic contact dermatitis, the proinflammatory cytokine tumour necrosis factor (TNF) plays an important role by promoting epidermal Langerhans cell migration to draining lymph nodes. It also plays a role during the elicitation phase. The TNF gene (TNF) is located within the major histocompatibility complex region. Many single-nucleotide variants exist in the promoter region of TNF, and these may either increase or decrease mRNA transcription and therefore lead to higher or lower levels of TNF...
March 16, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28299193/recent-advances-in-major-histocompatibility-complex-mhc-class-i-antigen-presentation-plastic-mhc-molecules-and-tapbpr-mediated-quality-control
#16
REVIEW
Andy van Hateren, Alistair Bailey, Tim Elliott
We have known since the late 1980s that the function of classical major histocompatibility complex (MHC) class I molecules is to bind peptides and display them at the cell surface to cytotoxic T cells. Recognition by these sentinels of the immune system can lead to the destruction of the presenting cell, thus protecting the host from pathogens and cancer. Classical MHC class I molecules (MHC I hereafter) are co-dominantly expressed, polygenic, and exceptionally polymorphic and have significant sequence diversity...
2017: F1000Research
https://www.readbyqxmd.com/read/28298179/preparation-of-peptide-mhc-and-t-cell-receptor-dextramers-by-biotinylated-dextran-doping
#17
Michael T Bethune, Begoña Comin-Anduix, Yu-Hsien Hwang Fu, Antoni Ribas, David Baltimore
Peptide-major histocompatibility complex (pMHC) multimers enable the detection, characterization, and isolation of antigen-specific T-cell subsets at the single-cell level via flow cytometry and fluorescence microscopy. These labeling reagents exploit a multivalent scaffold to increase the avidity of individually weak T-cell receptor (TCR)-pMHC interactions. Dextramers are an improvement over the original streptavidin-based tetramer technology because they are more multivalent, improving sensitivity for rare, low-avidity T cells, including self/tumor-reactive clones...
March 1, 2017: BioTechniques
https://www.readbyqxmd.com/read/28297658/multiscale-modeling-of-complex-formation-and-cd80-depletion-during-immune-synapse-development
#18
István P Sugár, Jayajit Das, Ciriyam Jayaprakash, Stuart C Sealfon
The mechanisms that discriminate self- and foreign antigen before T cell activation are unresolved. As part of the immune system's adaptive response to specific infections or neoplasms, antigen-presenting cells (APC) and effector T cells form transcellular molecular complexes. CTLA4 expression on regulatory or effector T cells reduces T cell activation. The CTLA4 transendocytosis hypothesis proposes that CTLA4 depletes CD80 and CD86 proteins from the APC membrane, rendering the APC incapable of activating T cells...
March 14, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28294313/suppression-of-murine-tumor-growth-through-cd8-ctls-via-activated-dec-205-dendritic-cells-by-sequential-administration-of-%C3%AE-galactosylceramide-in-vivo
#19
Hideki Kogo, Masumi Shimizu, Yasuyuki Negishi, Eiji Uchida, Hidemi Takahashi
Cancer immunity is mediated through the effective priming and activation of tumor-specific class I major histocompatibility complex (MHC-I) molecule-restricted CD8(+) cytotoxic T lymphocytes (CTLs). DEC-205(+) dendritic cells (DCs) can cross-present the epitope(s) of captured tumor antigens associated with class I MHC molecules alongside co-stimulatory molecules to prime and activate tumor-specific CD8(+) CTLs. Immunosuppressive tolerogenic DCs with reduced co-stimulatory molecules may be a cause of impaired CTL induction...
March 12, 2017: Immunology
https://www.readbyqxmd.com/read/28293529/facial-nerve-recovery-in-kbdb-and-c1q-knockout-mice-a-role-for-histocompatibility-complex-1
#20
Seden Akdagli, Ryan A Williams, Hyun J Kim, Yuling Yan, Mirna Mustapha, Sam P Most
BACKGROUND: Understanding the mechanisms in nerve damage can lead to better outcomes for neuronal rehabilitation. The purpose of our study was to assess the effect of major histocompatibility complex I deficiency and inhibition of the classical complement pathway (C1q) on functional recovery and cell survival in the facial motor nucleus (FMN) after crush injury in adult and juvenile mice. METHODS: A prospective blinded analysis of functional recovery and cell survival in the FMN after a unilateral facial nerve crush injury in juvenile and adult mice was undertaken between wild-type, C1q knockout (C1q-/-), and KbDb knockout (KbDb-/-) groups...
December 2016: Plastic and Reconstructive Surgery. Global Open
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