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antigen presentation

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https://www.readbyqxmd.com/read/29777794/regulatory-t-cell-targeted-hybrid-nanoparticles-combined-with-immuno-checkpoint-blockage-for-cancer-immunotherapy
#1
Wenquan Ou, Raj Kumar Thapa, Liyuan Jiang, Soe Zar Chi, Milan Gautam, Jae-Hoon Chang, Jee-Heon Jeong, Sae Kwang Ku, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
Immunosuppression in tumor microenvironments induced by regulatory T (Treg) cells is regarded a critical mechanism of tumor immune escape and poses a major impediment to cancer immunotherapy. In this study, we developed tLyp1 peptide-conjugated hybrid nanoparticles for targeting Treg cells in the tumor microenvironment. The tLyp1 peptide-modified hybrid nanoparticles presented good stability and effective targeting to Treg cells, and they enhanced the effect of imatinib in downregulating Treg cell suppression through inhibition of STAT3 and STAT5 phosphorylation...
May 16, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29777675/brain-derived-microparticles-activate-microglia-macrophages-and-induce-neuroinflammation
#2
Hongtao Rong, Yueshan Fan, Mengchen Yang, Baoliang Zhang, Dongdong Sun, Zilong Zhao, Dong Wang, Weidong Fan, Jianhao Wang, Gang Gu, Fanjian Li, Xilei Liu, Chenxu Rao, Huijiao Chen, Yi Wang, Ye Tian, Jianning Zhang
Microparticles are cell fragments derived from damaged cells that are able to present an antigen from the parent cells to other cells to activate intracellular signaling pathways. Microparticles are closely related to the inflammatory response. Brain-derived microparticles (BDMPs) play an important role in brain injury. However, the inflammatory effect of BDMPs on microglia/macrophages remains unclear. The BDMPs were consumed by microglia/macrophages in vivo and in vitro. The BDMPs activated microglia/macrophages and changed their morphology in vitro...
May 16, 2018: Brain Research
https://www.readbyqxmd.com/read/29777458/increased-vitamin-d-receptor-gene-expression-and-rs11568820-and-rs4516035-promoter-polymorphisms-in-autistic-disorder
#3
Burhan Balta, Hakan Gumus, Ruslan Bayramov, Keziban Korkmaz Bayramov, Murat Erdogan, Didem Behice Oztop, Muhammet Ensar Dogan, Serpil Taheri, Munis Dundar
Although there are a large number of sequence variants of different genes and copy number variations at various loci identified in autistic disorder (AD) patients, the pathogenesis of AD has not been elucidated completely. Recently, in AD patients, a large number of expression array and transcriptome studies have shown an increase in the expression of genes especially related to innate immune response. Antimicrobial effects of vitamin D and VDR are exerted through Toll-Like-Receptors (TLR) which have an important role in the innate immune response, are expressed by antigen presenting cells and recognize foreign microorganisms...
May 18, 2018: Molecular Biology Reports
https://www.readbyqxmd.com/read/29776993/tumor-immune-evasion-arises-through-loss-of-tnf-sensitivity
#4
Conor J Kearney, Stephin J Vervoort, Simon J Hogg, Kelly M Ramsbottom, Andrew J Freeman, Najoua Lalaoui, Lizzy Pijpers, Jessica Michie, Kristin K Brown, Deborah A Knight, Vivien Sutton, Paul A Beavis, Ilia Voskoboinik, Phil K Darcy, John Silke, Joseph A Trapani, Ricky W Johnstone, Jane Oliaro
Immunotherapy has revolutionized outcomes for cancer patients, but the mechanisms of resistance remain poorly defined. We used a series of whole-genome clustered regularly interspaced short palindromic repeat (CRISPR)-based screens performed in vitro and in vivo to identify mechanisms of tumor immune evasion from cytotoxic lymphocytes [CD8+ T cells and natural killer (NK) cells]. Deletion of key genes within the tumor necrosis factor (TNF) signaling, interferon-γ (IFN-γ) signaling, and antigen presentation pathways provided protection of tumor cells from CD8+ T cell-mediated killing and blunted antitumor immune responses in vivo...
May 18, 2018: Science Immunology
https://www.readbyqxmd.com/read/29775855/dual-core-all-fiber-integrated-immunosensor-for-detection-of-protein-antigens
#5
Karol Wysokiński, Dawid Budnicki, Janusz Fidelus, Łukasz Szostkiewicz, Łukasz Ostrowski, Micha Murawski, Marcin Staniszewski, Magdalena Staniszewska, Marek Napierała, Tomasz Nasiłowski
An optical fiber interferometric microprobe for detection of specific proteins is presented in this paper. The microprobe is an all-fiber device, which is based on Michelson interferometer configuration, which allows for detection of protein antigens in an analyzed solution thanks to antibodies immobilized on the sensor surface. The interferometer is made of dual core fiber and has a precisely formed arm length difference, achieved by splicing a fragment of polarization maintaining fiber to one of the cores...
May 9, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775658/hydroxysafflor-yellow-a-protects-brain-microvascular-endothelial-cells-against-oxygen-glucose-deprivation-reoxygenation-injury-involvement-of-inhibiting-autophagy-via-class-i-pi3k-akt-mtor-signaling-pathway
#6
Guang Yang, Ning Wang, Sai Wang Seto, Dennis Chang, Huazheng Liang
The present study aimed to test whether Hydroxysafflor yellow A (HSYA) protects the brain microvascular endothelial cells (BMECs) injury induced by oxygen glucose deprivation/reoxygenation (OGD/R) via the PI3K/Akt/mTOR autophagy signaling pathway. Primary rat BMECs were cultured and identified by the expression of factor VIII-related antigen before being exposed to OGD/R to imitate ischemia/reperfusion (I/R) damage in vitro. The protective effect of HSYA was evaluated by assessing (1) cellular morphologic and ultrastructural changes; (2) cell viability and cytotoxicity; (3) transendothelial electrical resistance (TEER) of monolayer BMECs; (4) cell apoptosis; (5) fluorescence intensity of LC3B; (6) LC3 mRNA expression; (7) protein expressions of LC3, Beclin-1, Zonula occludens-1 (ZO-1), phospho-Akt (p-Akt), Akt, phospho-mTOR (p-mTOR) and mTOR...
May 15, 2018: Brain Research Bulletin
https://www.readbyqxmd.com/read/29775592/dietary-and-microbial-oxazoles-induce-intestinal-inflammation-by-modulating-aryl-hydrocarbon-receptor-responses
#7
Shankar S Iyer, Thomas Gensollen, Amit Gandhi, Sungwhan F Oh, Joana F Neves, Frederic Collin, Richard Lavin, Carme Serra, Jonathan Glickman, Punyanganie S A de Silva, R Balfour Sartor, Gurdyal Besra, Russell Hauser, Anthony Maxwell, Amadeu Llebaria, Richard S Blumberg
Genome-wide association studies have identified risk loci associated with the development of inflammatory bowel disease, while epidemiological studies have emphasized that pathogenesis likely involves host interactions with environmental elements whose source and structure need to be defined. Here, we identify a class of compounds derived from dietary, microbial, and industrial sources that are characterized by the presence of a five-membered oxazole ring and induce CD1d-dependent intestinal inflammation. We observe that minimal oxazole structures modulate natural killer T cell-dependent inflammation by regulating lipid antigen presentation by CD1d on intestinal epithelial cells (IECs)...
May 17, 2018: Cell
https://www.readbyqxmd.com/read/29774202/loss-of-the-cyclin-dependent-kinase-inhibitor-1-in-the-context-of-brachyury-mediated-phenotypic-plasticity-drives-tumor-resistance-to-immune-attack
#8
Duane H Hamilton, Kristen K McCampbell, Claudia Palena
The acquisition of mesenchymal features by carcinoma cells is now recognized as a driver of metastasis and tumor resistance to a range of anticancer therapeutics, including chemotherapy, radiation, and certain small-molecule targeted therapies. With the recent successful implementation of immunotherapies for the treatment of various types of cancer, there is growing interest in understanding whether an immunological approach could be effective at eradicating carcinoma cells bearing mesenchymal features. Recent studies, however, demonstrated that carcinoma cells that have acquired mesenchymal features may also exhibit decreased susceptibility to lysis mediated by immune effector cells, including antigen-specific CD8+ T cells, innate natural killer (NK), and lymphokine-activated killer (LAK) cells...
2018: Frontiers in Oncology
https://www.readbyqxmd.com/read/29774134/an-undifferentiated-carcinoma-at-klatskin-position-with-long-term-complete-remission-after-chemotherapy
#9
Bruno Christian Köhler, Benjamin Goeppert, Nina Waldburger, Kai Schlamp, Peter Sauer, Dirk Jäger, Karl Heinz Weiss, Stephan Macher-Göppinger, Henning Schulze-Bergkamen, Peter Schirmacher, Christoph Springfeld
Background: Neoplasms anatomically adjacent to the bile duct usually derive from malignantly transformed cholangiocytes forming cholangiocarcinoma (CCA). CCAs are divided in extrahepatic (eCCA) and intrahepatic (iCCA) tumors. Patients with irresectable CCAs are treated with systemic chemotherapy and have an unfavorable prognosis with a median survival of about one year. Here, we report a case of an undifferentiated carcinoma in Klatskin-position with long-term remission after systemic chemotherapy...
April 24, 2018: Oncotarget
https://www.readbyqxmd.com/read/29774053/postherpes-simplex-encephalitis-a-case-series-of-viral-triggered-autoimmunity-synaptic-autoantibodies-and-response-to-therapy
#10
Harry Alexopoulos, Sofia Akrivou, Sotiria Mastroyanni, Maria Antonopoulou, Argirios Dinopoulos, Melpo Giorgi, Kostas Konstantinou, Evangelos Kouremenos, Maria Lariou, Dimitrios Naoumis, Efterpi Pavlidou, Evaggelos Pavlou, Konstantinos Voudris, Panayotis Vlachoyiannopoulos, Marinos C Dalakas
Background: Recent evidence suggests that patients with herpes simplex virus (HSV) encephalitis may relapse because of autoimmunity against the N-methyl-D-aspartate receptor (NMDAR). We present a case series of post-HSV relapsing encephalopathy associated with antibodies to central nervous system (CNS) synaptic antigens. Patient/Methods: Sera and cerebrospinal fluid (CSF) from five patients with HSV encephalitis who relapsed after antiviral therapy were tested for anti-NMDAR, gamma-aminobutyric acid b receptor (GABAbR), α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR), Leucine-rich, glioma inactivated 1 (LGI1), anti -contactin-associated protein-like 2 (CASPR2) and dipeptidyl-peptidase-like protein-6 (DDPX) antibodies using cell-based assays...
2018: Therapeutic Advances in Neurological Disorders
https://www.readbyqxmd.com/read/29774030/changes-in-the-tcr%C3%AE-repertoire-and-tumor-immune-signature-from-a-cutaneous-melanoma-patient-immunized-with-the-csf-470-vaccine-a-case-report
#11
Mariana Aris, Alicia Inés Bravo, María Betina Pampena, Paula Alejandra Blanco, Ibel Carri, Daniel Koile, Patricio Yankilevich, Estrella Mariel Levy, María Marcela Barrio, José Mordoh
The allogeneic therapeutic vaccine CSF-470 has demonstrated a significant benefit over medium-dose IFNα2b in the distant metastasis-free survival for stages IIB-IIC-III cutaneous melanoma patients in a randomized phase II/III clinical trial (CASVAC-0401, NCT01729663). At the end of the 2-year CSF-470 immunization protocol, patient #006 developed several lung and one subcutaneous melanoma metastases; this later was excised. In this report, we analyzed the changes throughout vaccination of immune populations in blood and in the tumor tissue, with special focus on the T-cell repertoire...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29774029/lfa-1-in-t-cell-migration-and-differentiation
#12
REVIEW
Brandon L Walling, Minsoo Kim
Maintenance of homeostatic immune surveillance and development of effective adaptive immune responses require precise regulation of spatial and temporal lymphocyte trafficking throughout the body to ensure pathogen clearance and memory generation. Dysregulation of lymphocyte activation and migration can lead to impaired adaptive immunity, recurrent infections, and an array of autoimmune diseases and chronic inflammation. Central to the recruitment of T cells, integrins are cell surface receptors that regulate adhesion, signal transduction, and migration...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29774024/quantification-of-hla-dm-dependent-major-histocompatibility-complex-of-class-ii-immunopeptidomes-by-the-peptide-landscape-antigenic-epitope-alignment-utility
#13
Miguel Álvaro-Benito, Eliot Morrison, Esam T Abualrous, Benno Kuropka, Christian Freund
The major histocompatibility complex of class II (MHCII) immunopeptidome represents the repertoire of antigenic peptides with the potential to activate CD4+ T cells. An understanding of how the relative abundance of specific antigenic epitopes affects the outcome of T cell responses is an important aspect of adaptive immunity and offers a venue to more rationally tailor T cell activation in the context of disease. Recent advances in mass spectrometric instrumentation, computational power, labeling strategies, and software analysis have enabled an increasing number of stratified studies on HLA ligandomes, in the context of both basic and translational research...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29773802/cd4-t-cells-are-activated-in-regional-lymph-nodes-and-migrate-to-skin-to-initiate-lymphedema
#14
Gabriela D García Nores, Catherine L Ly, Daniel A Cuzzone, Raghu P Kataru, Geoffrey E Hespe, Jeremy S Torrisi, Jung Ju Huang, Jason C Gardenier, Ira L Savetsky, Matthew D Nitti, Jessie Z Yu, Sonia Rehal, Babak J Mehrara
T cell-mediated responses have been implicated in the development of fibrosis, impaired lymphangiogenesis, and lymphatic dysfunction in secondary lymphedema. Here we show that CD4+ T cells are necessary for lymphedema pathogenesis by utilizing adoptive transfer techniques in CD4 knockout mice that have undergone tail skin and lymphatic excision or popliteal lymph node dissection. We also demonstrate that T cell activation following lymphatic injury occurs in regional skin-draining lymph nodes after interaction with antigen-presenting cells such as dendritic cells...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29773329/mutation-screening-of-the-tia1-gene-in-chinese-patients-with-amyotrophic-lateral-sclerosis-frontotemporal-dementia
#15
XiaoJing Gu, YongPing Chen, QianQian Wei, Bei Cao, RuWei Ou, XiaoQin Yuan, YanBin Hou, LingYu Zhang, Hui Liu, XuePing Chen, Hui-Fang Shang
Mutations in the low-complexity domain (LCD) of T-cell intracellular antigen-1 (TIA1) have been reported to be associated with amyotrophic lateral sclerosis/frontotemporal dementia (ALS/FTD) in the Caucasian population. In the present study, we aimed to screen mutations in the LCD (exon 11-13) of TIA1 and determine the mutation frequency in Chinese ALS/FTD patients. A total of 740 ALS patients, including 721 sporadic ALS (sALS), 19 familial ALS, 24 FTD patients, and 501 healthy controls, were directly sequenced...
April 24, 2018: Neurobiology of Aging
https://www.readbyqxmd.com/read/29773094/replication-and-pathology-of-duck-influenza-virus-subtype-h9n2-in-chukar
#16
Yin Chuan Zhu, Bin Zhang, Zeng Hui Sun, Xi Jing Wang, Xiao Hui Fan, Ling Xi Gao, Ying Liang, Xiao Yan Chen, Zeng Feng Zhang
To investigate the susceptibility of Chukars to duck avian influenza virus H9N2 and explore their role in interspecies transmission of influenza viruses. Chukars were inoculated with duck avian influenza viruses H9N2. The present study demonstrated that inflammatory lesions and virus antigen were present in the trachea, bronchus, and parabronchus, and the viruses could be isolated from throat swabs and lung tissue homogenate supernatants. At 14 d post virus inoculation, anti-H9 influenza virus antibody in the serum was detected...
April 2018: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29772620/-development-of-ectopic-adrenocorticotropic-hormone-syndrome-in-a-patient-with-prostate-cancer-during-combined-androgen-blockade-therapy
#17
Yosuke Sekii, Mitsuhiro Yoshinaga, Masahiro Nakagawa, Hidefumi Kishikawa, Kazumasa Oka, Kenji Nishimura
A 74-year old man presented to us with difficulty urinating. The laboratory examinations revealed an elevated prostate-specific antigen (PSA) level. A prostate biopsy revealed prostate adenocarcinoma. The computed tomography scan showed metastasis to lymph nodes in the pelvic cavity and both adrenal glands. Combined androgen blockade therapy was started, and PSA levels began to decrease gradually. However, 2 months later, he was hospitalized for treatment of cellulitis and was found to have hypertension, hyperglycemia, and hypokalemia...
April 2018: Hinyokika Kiyo. Acta Urologica Japonica
https://www.readbyqxmd.com/read/29772527/a-novel-role-for-cd26-dipeptidyl-peptidase-iv-as-a-therapeutic-target
#18
Kei Ohnuma, Ryo Hatano, Eriko Komiya, Haruna Otsuka, Takumi Itoh, Noriaki Iwao, Yutaro Kaneko, Taketo Yamada, Nam H Dang, Chikao Morimoto
CD26 is a 110 kDa surface glycoprotein with intrinsic dipeptidyl peptidase IV activity that is expressed on numerous cell types and has a multitude of biological functions. The role of CD26 in immune regulation has been extensively characterized, with recent findings elucidating its linkage with signaling pathways and structures involved in T-lymphocyte activation as well as antigen presenting cell-T-cell interaction. In this paper, we will review emerging data on CD26-mediated immune regulation suggesting that CD26 may be an appropriate therapeutic target for the treatment of selected immune disorders as well as Middle East respiratory syndrome coronavirus...
June 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/29772011/induction-of-influenza-specific-local-cd8-t-cells-in-the-respiratory-tract-after-aerosol-delivery-of-vaccine-antigen-or-virus-in-the-babraham-inbred-pig
#19
Katie Tungatt, Garry Dolton, Sophie B Morgan, Meriem Attaf, Anna Fuller, Thomas Whalley, Johanneke D Hemmink, Emily Porter, Barbara Szomolay, Maria Montoya, John A Hammond, John J Miles, David K Cole, Alain Townsend, Mick Bailey, Pierre J Rizkallah, Bryan Charleston, Elma Tchilian, Andrew K Sewell
There is increasing evidence that induction of local immune responses is a key component of effective vaccines. For respiratory pathogens, for example tuberculosis and influenza, aerosol delivery is being actively explored as a method to administer vaccine antigens. Current animal models used to study respiratory pathogens suffer from anatomical disparity with humans. The pig is a natural and important host of influenza viruses and is physiologically more comparable to humans than other animal models in terms of size, respiratory tract biology and volume...
May 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29771636/subcellular-topography-modulates-actin-dynamics-and-signaling-in-b-cells
#20
Christina M Ketchum, Xiaoyu Sun, Alexandra Suberi, John T Fourkas, Wenxia Song, Arpita Upadhyaya
B cell signaling activation is most effectively triggered by the binding of B cell receptors (BCRs) to membrane-bound antigens.  In vivo, B cells encounter antigen on antigen presenting cells (APC), which possess complex surfaces with convoluted topographies, a fluid membrane and deformable cell bodies. However, whether and how the physical properties of antigen presentation affect B cell activation is not well understood. Here, we use nanotopographic surfaces that allow systematic variation of geometric parameters to show that surface features on a subcellular scale influence B cell signaling and actin dynamics...
May 17, 2018: Molecular Biology of the Cell
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