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Major histocompatibility complex

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https://www.readbyqxmd.com/read/29679484/the-role-of-autoimmune-reactivity-induced-by-heat-shock-protein-70-in-the-pathogenesis-of-essential-hypertension
#1
REVIEW
Bernardo Rodriguez-Iturbe, Miguel A Lanaspa, Richard J Johnson
Autoimmunity is increasingly recognized as having a central role in essential hypertension. Heat shock proteins are immunodominant molecules with high interspecies homology and autoimmune reactivity directed against HSP70 may play a role in the pathogenesis of hypertension. Autoimmunity to HSP70 may result from molecular mimicry between human HSP and bacterial HSP, or alternatively, as a response to HSP70-peptide complexes generated during cellular stress and delivered to the major histocompatibility complex in antigen presenting cells...
April 21, 2018: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29677478/unfinished-business-evolution-of-the-mhc-and-the-adaptive-immune-system-of-jawed-vertebrates
#2
Jim Kaufman
The major histocompatibility complex (MHC) is a large genetic region with many genes, including the highly polymorphic classical class I and II genes that play crucial roles in adaptive as well as innate immune responses. The organization of the MHC varies enormously among jawed vertebrates, but class I and II genes have not been found in other animals. How did the MHC arise, and are there underlying principles that can help us to understand the evolution of the MHC? This review considers what it means to be an MHC and the potential importance of genome-wide duplication, gene linkage, and gene coevolution for the emergence and evolution of an adaptive immune system...
April 26, 2018: Annual Review of Immunology
https://www.readbyqxmd.com/read/29674503/dexamethasone-promotes-durable-factor-viii-specific-tolerance-in-hemophilia-a-mice-via-thymic-mechanisms
#3
Maria T Georgescu, Paul C Moorehead, Alice S van Velzen, Kate Nesbitt, Birgit M Reipert, Katharina N Steinitz, Maria Schuster, Christine Hough, David Lillicrap
The development of inhibitory antibodies to factor VIII is the most serious complication of replacement therapy in hemophilia A. Activation of the innate immune system during exposure to this protein contributes to inhibitor development. However, avoidance of factor VIII exposure during innate immune system activation by external stimuli (e.g. vaccines) has not been consistently shown to prevent inhibitors. We hypothesized that dexamethasone, a drug with potent anti-inflammatory effects, could prevent inhibitors by promoting immunologic tolerance to factor VIII in hemophilia A mice...
April 19, 2018: Haematologica
https://www.readbyqxmd.com/read/29673068/molecular-definition-of-the-transplantation-antigens
#4
REVIEW
Peter Parham
In the first half of the twentieth century, the Major Histocompatibility Complex (MHC) of the laboratory mouse, the H-2 complex, was defined by a combination of serology and genetics. In the second half of the twentieth century, its human counterpart, the Human Leukocyte Antigen (HLA) complex was similarly defined and shown to mediate rejection of allogeneic kidney grafts. The clinical relevance of the transplantation antigens created the field of transplant immunology, which aimed to reduce graft rejection by HLA matching of transplant donors and recipients, and to use immunosuppressive drugs to prevent and treat rejection...
April 19, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29670037/expression-and-regulation-of-thymic-stromal-lymphopoietin-and-thymic-stromal-lymphopoietin-receptor-heterocomplex-in-the-innate-adaptive-immunity-of-pediatric-asthma
#5
REVIEW
Sheng-Chieh Lin, Fang-Yi Cheng, Jun-Jen Liu, Yi-Ling Ye
Asthma is a chronic inflammatory disease affecting the airway, and it is characterized by a wheezing breathing sound, variable airflow obstruction and the presence of inflammatory cells in the submucosa of the bronchi. Viral infection, pollutants and sensitivity to aeroallergens damage the epithelium from childhood, which causes asthma. The pathogenesis of asthma includes pathways of innate stimulation by environmental microbes and irritant pathogens. Damaged epithelial cells produce thymic stromal lymphopoietin (TSLP) and stimulate myeloid dendritic cell maturation through the thymic stromal lymphopoietin receptor (TSLPR) heterocomplex...
April 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29670015/extracellular-vesicles-as-conveyors-of-membrane-derived-bioactive-lipids-in-immune-system
#6
REVIEW
Krizia Sagini, Eva Costanzi, Carla Emiliani, Sandra Buratta, Lorena Urbanelli
Over the last 20 years, extracellular vesicles (EVs) have been established as an additional way to transmit signals outside the cell. They are membrane-surrounded structures of nanometric size that can either originate from the membrane invagination of multivesicular bodies of the late endosomal compartment (exosomes) or bud from the plasma membrane (microvesicles). They contain proteins, lipids, and nucleic acids—namely miRNA, but also mRNA and lncRNA—which are derived from the parental cell, and have been retrieved in every fluid of the body...
April 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29669733/evolution-of-dnaasei-hypersensitive-sites-in-mhc-regulatory-regions-of-primates
#7
Yabin Jin, Rachel M Gittelman, Yueer Lu, Xiaohui Liu, Ming D Li, Fei Ling, Joshua M Akey
It has been challenged to determine the disease-causing variant(s) for most major histocompatibility complex (MHC) associated diseases. However, it is becoming increasingly clear that regulatory variation is pervasive and a fundamentally important mechanism governing phenotypic diversity and disease susceptibility. We leveraged DNase I data from 136 human cells to characterize the regulatory landscape of the MHC region, including 4867 DNase I hypersensitive sites (DHSs). We identified thousands of regulatory elements that have been gained or lost in the human or chimpanzee genomes since their evolutionary divergence...
April 18, 2018: Genetics
https://www.readbyqxmd.com/read/29669333/the-role-of-proteasome-inhibitor-mg132-in-2-4-dinitrofluorobenzene-induced-atopic-dermatitis-in-nc-nga-mice
#8
Kozo Ohkusu-Tsukada, Daiki Ito, Kimimasa Takahashi
BACKGROUND: Although immunosuppressants for therapy of atopic dermatitis (AD) are still being sought, proteasome inhibitors are also potential candidates for the treatment of AD. Proteasome inhibitors exert various effects by blocking proteasomal degradation and help regulate processes such as apoptosis induction via caspase-9, cell cycle progression via cyclins, NF-κB inactivation via IκB, and downregulation of antigen cross-presentation. The cells targeted by proteasome inhibitors are therefore activated cells undergoing proliferation or differentiation, and antigen-presenting cells carrying out protein degradation...
April 18, 2018: International Archives of Allergy and Immunology
https://www.readbyqxmd.com/read/29666331/isolation-and-characterization-of-the-major-histocompatibility-complex-dqa1-and-dqa2-genes-in-gayal-bos-frontalis
#9
Sameeullah Memon, Liping Wang, Guozhi Li, Xiangying Liu, Weidong Deng, Dongmei Xi
The species origin of Yunnan gayal has been controversial since many years. However, few recent genetic studies have suggested that it has perhaps originated from the hybridization between male Bos frontalis and female B. taurus or B. indicus. Being an important semi-wild bovid species, this has also been listed under the red list of International Union of Conservation of Nature and Natural Resources. However, there is limited information available about the immunogenicity of this precarious species of Bos...
March 2018: Journal of Genetics
https://www.readbyqxmd.com/read/29666167/a-flexible-mhc-class-i-multimer-loading-system-for-large-scale-detection-of-antigen-specific-t-cells
#10
Jolien J Luimstra, Malgorzata A Garstka, Marthe C J Roex, Anke Redeker, George M C Janssen, Peter A van Veelen, Ramon Arens, J H Frederik Falkenburg, Jacques Neefjes, Huib Ovaa
Adaptive immunity is initiated by T cell recognition of specific antigens presented by major histocompatibility complexes (MHCs). MHC multimer technology has been developed for the detection, isolation, and characterization of T cells in infection, autoimmunity, and cancer. Here, we present a simple, fast, flexible, and efficient method to generate many different MHC class I (MHC I) multimers in parallel using temperature-mediated peptide exchange. We designed conditional peptides for HLA-A*02:01 and H-2Kb that form stable peptide-MHC I complexes at low temperatures, but dissociate when exposed to a defined elevated temperature...
April 17, 2018: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29665944/-current-status-and-challenges-of-car-t-immunotherapy-in-hematologic-malignancies-review
#11
Xin Cheng, Ya-Jie Wang, Shuai Feng, Ya-Yun Wu, Tong-Hua Yang, Xun Lai
The chimeric antigen receptor (CAR) T cell therapy has gradually became a new trend in the treatment of refractory and relapsed hematologic malignancies by developing for 30 years. With the exciting development of genetic engineering, CAR-T technology has subjected to 4 generations of innovation. Structure of CAR-T started from a single signal molecule to 2 or more than 2 co-stimulatory molecules, and then coding the CAR gene or promoter. CAR-T can specifically recognize tumor antigens, and does not be restricted by major histocompatibility complex (MHC), thus making a breakthrough in clinical treatment...
April 2018: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/29665025/a-global-analysis-of-selection-at-the-avian-mhc
#12
Piotr Minias, Ewa Pikus, Linda A Whittingham, Peter O Dunn
Recent advancements in sequencing technology have resulted in rapid progress in the study of the Major Histocompatibility Complex (MHC) in non-model avian species. Here, we analyse a global dataset of avian MHC class I and class II sequences (ca. eleven thousand sequences from over 250 species) to gain insight into the processes that govern macroevolution of MHC genes in birds. Analysis of substitution rates revealed striking differences in the patterns of diversifying selection between passerine and non-passerine birds...
April 17, 2018: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/29664578/tcr-tuning-of-t-cell-subsets
#13
REVIEW
Jae-Ho Cho, Jonathan Sprent
After selection in the thymus, the post-thymic T cell compartments comprise heterogenous subsets of naive and memory T cells that make continuous T cell receptor (TCR) contact with self-ligands bound to major histocompatibility complex (MHC) molecules. T cell recognition of self-MHC ligands elicits covert TCR signaling and is particularly important for controlling survival of naive T cells. Such tonic TCR signaling is tightly controlled and maintains the cells in a quiescent state to avoid autoimmunity. Here, we review how naive and memory T cells are differentially tuned and wired for TCR sensitivity to self and foreign ligands...
May 2018: Immunological Reviews
https://www.readbyqxmd.com/read/29663824/immunohistochemical-study-on-antigen-presenting-cells-in-healthy-and-carious-human-teeth
#14
A Sotirovska Ivkovska, E Zabokova-Bilbilova, Z Georgiev, E Bajraktarova Valjakova, L Ivkovski
Class II major histocompatibility complex (MHC) antigen-presenting cells are associated with the early phase of the immune response. We have studied the distribution of class II-expressing cells in developing, healthy and carious human teeth to clarify, when human pulp acquires an immunologic defense potential and how this reacts to dental caries. Antigen-expressing cells were identified immunohistochemically with the following monoclonal antibodies: HLA-DR - for dendritic cells and CD68 - for macrophages. In the pulp of unerupted developing teeth, HLA-DR-positive cells were distributed mainly in and around the odontoblast layer...
2018: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/29662965/relationship-between-human-leukocyte-antigen-hla-dqa1-0102-hla-dqb1-0602-polymorphism-and-preeclampsia
#15
Mahmoud Mohammadi, Touraj Farazmandfar, Majid Shahbazi
Background: Preeclampsia is a condition associated with systemic disorders in the mother and the fetus. However, the exact causes of preeclampsia are unknown, but several genetics and environmental factors play role in development of this disease. Major histocompatibility complex role is very important during pregnancy through which the fetus is not rejected by mother's immune system. Objective: In this study, we investigated the relationship of the human leukocyte antigen (HLA)-DQA1*0102/HLA-DQB1*0602 polymorphism with preeclampsia...
September 2017: International Journal of Reproductive Biomedicine (Yazd, Iran)
https://www.readbyqxmd.com/read/29662678/interleukin-6-is-a-key-factor-for-immunoglobulin-like-transcript-4-mediated-immune-injury-in-sepsis
#16
De Wen Zhang, Jian He
Background: ILT4+ monocytes seem to be associated with poor prognosis of sepsis in humans, but the exact mechanisms are unknown. This study aimed to examine the biological behaviors and effects of immunoglobulin-like transcript-4 (ILT4) levels on monocytes during sepsis and on the prognosis of sepsis. Methods: ILT4+/+ (WT) and ILT4-knockout (ILT4-/- ) male BALB/c mice were used for sepsis modeling using cecal ligation puncture (CLP). Flow cytometry was used to measure the levels of ILT4 and major histocompatibility complex class II (MHC-II) on peripheral blood monocytes 24 h after CLP...
2018: Journal of Intensive Care
https://www.readbyqxmd.com/read/29660112/evaluation-of-membrane-bound-and-soluble-forms-of-hla-g-in-systemic-sclerosis
#17
Paola Contini, Simone Negrini, Giuseppe Murdaca, Matteo Borro, Francesco Puppo
Systemic sclerosis (SSc) is a complex disease characterized by immune dysregulation, extensive vascular damage and wide-spread fibrosis. Human leukocyte antigen-G (HLA-G) is a non-classic class I major histocompatibility complex (MHC) molecule characterized by complex immuno-modulating properties. HLA-G is expressed on the membrane of different cell lineages in both physiological and pathological conditions. HLA-G is also detectable in soluble form (sHLA-G) deriving from the shedding of surface isoforms (sHLA-G1) or the secretion of soluble isoforms (HLA-G5)...
April 16, 2018: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/29656111/circulating-histocompatibility-antigen-hla-gene-products-may-help-differentiate-benign-from-malignant-indeterminate-pulmonary-lesions
#18
Smriti Kanangat, Christopher W Seder, Melissa R Pergande, Gabriela C Lobato, Cristina L Fhied, Maryam F Raouf, Michael J Liptay, Jeffrey A Borgia
BACKGROUND: This study explores the potential diagnostic utility of soluble Human Leukocyte Antigen (sHLA) molecules differentially released by lung adenocarcinoma and benign lung lesions. METHODS: Conditioned media from the NSCLC cell lines H358 and H1703 were immunoblotted for soluble isoforms of major histocompatibility complex (MHC) class I (ABC) and II (DRB1, DMB, and DQ) antigens. Sera from 25 patients with benign and 25 patients with malignant lesions were similarly evaluated to appraise the potential diagnostic value...
April 12, 2018: Human Immunology
https://www.readbyqxmd.com/read/29651744/prospects-of-chimeric-antigen-receptor-t-cell-therapy-in-ovarian-cancer
#19
REVIEW
Vishal Jindal, Ena Arora, Sorab Gupta, Amos Lal, Muhammad Masab, Rashmika Potdar
Despite advances in various chemotherapy regimens, current therapeutic options are limited for ovarian cancer patients. Immunotherapy provides a promising and novel treatment option for ovarian cancer. Recently, chimeric antigen receptor (CAR) T cell therapy has shown promising results in hematological tumors and current research is going on in various solid tumors like ovarian cancer. CAR T cells are genetically engineered T cells with major histocompatibility complex-independent, tumor-specific, immune-mediated cytolytic actions against cancer cells...
April 12, 2018: Medical Oncology
https://www.readbyqxmd.com/read/29643533/-topoisomerase-inhibitor-upregulates-mica-b-expression-in-breast-cancer-cells-through-atm-atr-and-nf-%C3%AE%C2%BAb-pathway
#20
Y Zhu, Y J Shi, Y L Zhao, P Zhu
OBJECTIVE: To investigate the effects of chemotherapeutic agents widely used in clinical practice on major histocompatibility complex class I-related chain A and B (MICA/B) expression in breast cancer cells, and to explore the molecular mechanisms involved. METHODS: We examined MICA/B mRNA and surface protein expressions in breast cancer cells treated with chemotherapeutic agents by real-time RT-PCR and flow cytometry respectively. The blocking effects of ataxia telangiectasia mutated and Rad3-related kinase (ATM/ATR) inhibitor caffeine and nuclear factor κB (NF-κB) inhibitor pynolidine dithiocarbamate (PDTC) on etoposide-upregulated MICA/B mRNA and surface protein expressions were investigated...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
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