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B7-H1

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https://www.readbyqxmd.com/read/28164807/induction-of-b7-h1-receptor-by-bacterial-cells-fractions-of-porphyromonas-gingivalis-on-human-oral-epithelial-cells-b7-h1-induction-by-porphyromonas-gingivalis-fractions
#1
S Groeger, F Jarzina, U Mamat, J Meyle
The immune-regulatory B7-H1 receptor, also known as programmed death-ligand 1 (PD-L1), plays an important role in cell-mediated immune response. It is a co-signaling molecule that mediates regulation of T cell activation and tolerance and is able to negatively regulate activated T cell functions and survival. High expression of B7-H1 in host cells may contribute to the chronicity of inflammatory disorders and represents a possible mechanism of immune evasion. Porphyromonas gingivalis is regarded as a keystone pathogen in periodontitis and is able to invade host cells and disposes a variety of virulence factors including lipopolysaccharide (LPS), fimbriae and proteases such as gingipains...
February 2017: Immunobiology
https://www.readbyqxmd.com/read/28153603/high-programmed-death-1-expression-on-t-cells-in-aplastic-anemia
#2
Wanhong Zhao, Yilin Zhang, Pengyu Zhang, Juan Yang, Longjin Zhang, Aili He, Wanggang Zhang, Tamura Hideto
Programmed death 1 (PD-1) has been reported to be associated with aberrant regulation of T cells activation in aplastic anemia (AA). However, the connection between PD-1 expression status and AA needs to be further explored. The aim of this study is to investigate PD-1 expression status on T cells in AA patients and to explore the effect of PD-1 on apoptosis of T cells and BMHSCs. The concentration of platelet, lymphocyte and hemoglobin in peripheral blood of AA patients and healthy volunteers was detected by automatic blood-counter system...
January 30, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28122590/pd-1-pd-l1-b7-h1-and-tumor-site-immune-modulation-therapy-the-historical-perspective
#3
REVIEW
Jun Wang, Ruirong Yuan, Wenru Song, Jingwei Sun, Delong Liu, Zihai Li
The current success of targeted inhibition against cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and Programmed Death 1/Programmed Death Ligand 1 (PD-1/PD-L1, herein collectively referred to as PD) pathways is hailed as a cancer immunotherapy breakthrough. PD-L1, known also as B7 homolog 1 (B7-H1), was initially discovered by Dr. Lieping Chen in 1999. To recognize the seminal contributions by Chen to the development of PD-directed therapy against cancer, the Chinese American Hematologist and Oncologist Network (CAHON) decided to honor him with its inaugural Lifetime Achievement Award in Hematology and Oncology at the CAHON's 2015 annual meeting...
January 25, 2017: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/28115915/effects-of-corticosteroid-plus-long-acting-beta2-agonist-on-the-expression-of-pd-l1-in-double-stranded-rna-induced-lung-inflammation-in-mice
#4
Saaka Hamano, Koichiro Matsumoto, Ken Tonai, Satoru Fukuyama, Keiko Kan-O, Nanae Seki, Hiromasa Inoue, Yoichi Nakanishi
BACKGROUND: Airway viral infections cause the exacerbations of asthma and chronic obstructive pulmonary disease. PD-L1, also known as B7-H1, is an immune-checkpoint molecule that plays a role in an escape mechanism of viruses from the host immune systems. This escape may be associated with the persistence of viral infection and the exacerbation of the underlying diseases. In a study in vitro, we have shown that corticosteroids plus long-acting beta2-agonists (LABAs) attenuate the upregulation of PD-L1 on airway epithelial cells stimulated with an analog of viral double-stranded RNA, polyinosinic-polycytidylic acid (poly I:C)...
2017: Journal of Inflammation
https://www.readbyqxmd.com/read/28062906/programmed-cell-death-1-pathway-inhibition-in-myeloid-malignancies-implications-for-myeloproliferative-neoplasms
#5
REVIEW
D C Choi, D Tremblay, C Iancu-Rubin, J Mascarenhas
Myeloproliferative neoplasms (MPNs) are clonal hematopoietic diseases that belong to the spectrum of myeloid malignancies (MyMs), which also include myelodysplastic syndromes (MDS), acute myeloid leukemia (AML), and chronic myelogenous leukemia (CML). While hematopoietic stem cell transplantation (HSCT) is a potentially curative therapeutic approach to many MyMs, the associated morbidity and mortality have necessitated the development of non-HSCT therapeutics for symptom management and disease course modification...
January 6, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28056089/helicobacter-pylori-promote-b7-h1-expression-by-suppressing-mir-152-and-mir-200b-in-gastric-cancer-cells
#6
Gengchen Xie, Wei Li, Ruidong Li, Ke Wu, Ende Zhao, Yu Zhang, Peng Zhang, Liang Shi, Di Wang, Yuping Yin, Rui Deng, Kaixiong Tao
The most common cause of gastric cancer is infection with helicobacter pylori (HP), but the associated molecular mechanism is not well understood. In the present study, we found a marked increase in the expression of B7-H1, a member of the B7 co-stimulatory family of molecules that bind to programmed death-1 (PD-1) and play a critical immunoregulatory role in the cell-mediated immune response, in HP-positive gastric cancer tissue. Infection of cultured gastric cancer cells with HP promoted B7-H1 expression and inhibited miR-152 and miR-200b expression...
2017: PloS One
https://www.readbyqxmd.com/read/28026044/expression-of-programmed-cell-death-1-and-its-ligand-b7-homolog-1-in-peripheral-blood-lymphocytes-from-patients-with-peripartum-cardiomyopathy
#7
Guozhi Xia, Xiaopu Zheng, Xinye Yao, Xiaowei Yao, Zhongwei Liu, Junkui Wang
BACKGROUND: Immune response has been postulated to play a prominent role in the pathogenesis of peripartum cardiomyopathy (PPCM). Given the importance of programmed death (PD)-1 and its ligand B7 homologue 1 (B7-H1) costimulatory molecules as an immune regulatory pathway, this study aimed to investigate the effect of PD-1 and B7-H1 expression on immune response in peripheral blood lymphocytes from the patients with PPCM. HYPOTHESIS: PD-1 and B7-H1 may be involved in modulating immune response in PPCM...
December 27, 2016: Clinical Cardiology
https://www.readbyqxmd.com/read/28024695/tumor-b7-h3-cd276-expression-and-smoking-history-in-relation-to-lung-adenocarcinoma-prognosis
#8
Kentaro Inamura, Yusuke Yokouchi, Maki Kobayashi, Rie Sakakibara, Hironori Ninomiya, Sophia Subat, Hiroko Nagano, Kimie Nomura, Sakae Okumura, Tomoko Shibutani, Yuichi Ishikawa
OBJECTIVES: Compared with non-smoking counterparts, smoking-associated lung cancers have a higher mutational load, resulting in the creation of more tumor neoantigens and increased immunogenicity. B7-H3 (also known as CD276) belongs to a family of immune modulators that includes PD-1 and PD-L1 (also known as B7-H1 or CD274). Considering the evidence that PD-L1 inhibitors have been shown to be more effective against lung cancer in smokers, we herein examined the prognostic interaction of tumor B7-H3 expression level with smoking history in lung adenocarcinoma patients...
January 2017: Lung Cancer: Journal of the International Association for the Study of Lung Cancer
https://www.readbyqxmd.com/read/28018338/the-pd1-pd-l1-2-pathway-from-discovery-to-clinical-implementation
#9
REVIEW
Kankana Bardhan, Theodora Anagnostou, Vassiliki A Boussiotis
The immune system maintains a critically organized network to defend against foreign particles, while evading self-reactivity simultaneously. T lymphocytes function as effectors and play an important regulatory role to orchestrate the immune signals. Although central tolerance mechanism results in the removal of the most of the autoreactive T cells during thymic selection, a fraction of self-reactive lymphocytes escapes to the periphery and pose a threat to cause autoimmunity. The immune system evolved various mechanisms to constrain such autoreactive T cells and maintain peripheral tolerance, including T cell anergy, deletion, and suppression by regulatory T cells (TRegs)...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27984276/mechanisms-of-liver-induced-tolerance
#10
Demetrios Moris, Lina Lu, Shiguang Qian
PURPOSE OF REVIEW: To highlight the results of the ongoing research on the mechanisms of liver-induced tolerance focusing on results from the last year. RECENT FINDINGS: The liver is exposed to a massive antigenic burden of dietary and commensal products from the gastrointestinal tract via portal vein, most of which are necessary for survival. To prevent the immune system from destroying these foreign yet beneficial elements, the liver has developed unique mechanisms to suppress immune responses...
February 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/27878564/the-role-of-b7-family-costimulatory-molecules-and-indoleamine-2-3-dioxygenase-in-primary-sj%C3%A3-gren-s-syndrome-and-systemic-sclerosis
#11
Nóra Legány, László Berta, László Kovács, Attila Balog, Gergely Toldi
B7 costimulatory molecules are present on antigen-presenting cells (APCs) and influence intracellular expression of indoleamine 2,3-dioxygenase (IDO), a molecule with important immunoregulatory functions. We determined the frequency of activated (CD11b+) monocytes expressing B7-1, B7-2, B7-H1, and B7-H2 molecules, and that of CD3+ and CD4+ T cells expressing the corresponding CD28, CTLA-4, PD-1, and ICOS receptors in peripheral blood samples of 20 healthy adults and 9 SSc and 15 pSS patients using flow cytometry...
November 23, 2016: Immunologic Research
https://www.readbyqxmd.com/read/27826944/retraction-note-to-prognostic-investigations-of-b7-h1-and-b7-h4-expression-levels-as-independent-predictor-markers-of-renal-cell-carcinoma
#12
Hamid Reza Safaei, Ayoob Rostamzadeh, Omid Rahmani, Mohsen Mohammadi, Omar Ghaderi, Hamid Yahaghi, Koroosh Ahmadi
No abstract text is available yet for this article.
November 9, 2016: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/27824138/b7-h1-antibodies-lose-antitumor-activity-due-to-activation-of-p38-mapk-that-leads-to-apoptosis-of-tumor-reactive-cd8-t-cells
#13
Xin Liu, Xiaosheng Wu, Siyu Cao, Susan M Harrington, Peng Yin, Aaron S Mansfield, Haidong Dong
B7-H1 (aka PD-L1) blocking antibodies have been used in treatment of human cancers through blocking B7-H1 expressed by tumor cells; however, their impact on B7-H1 expressing tumor-reactive CD8(+) T cells is still unknown. Here, we report that tumor-reactive CD8(+) T cells expressing B7-H1 are functional effector cells. In contrast to normal B7-H1 blocking antibody, B7-H1 antibodies capable of activating p38 MAPK lose their antitumor activity by deleting B7-H1(+) tumor-reactive CD8(+) T cells via p38 MAPK pathway...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27798164/programmed-death-ligand-1-plays-a-neuroprotective-role-in-experimental-autoimmune-neuritis-by-controlling-peripheral-nervous-system-inflammation-of-rats
#14
Yanan Ding, Ranran Han, Wei Jiang, Jinting Xiao, Haijie Liu, Xiuju Chen, Xiaowen Li, Junwei Hao
Programmed death 1 (PD-1; CD279), a member of the CD28 family, is an inhibitory receptor on T cells and is responsible for T cell dysfunction in infectious diseases and cancers. The ligand for PD-1, programmed death ligand 1 (PD-L1; also known as B7-H1, CD274), is a member of the B7 family. The engagement of PD-1 with programmed death ligand can downregulate autoreactive T cells that participate in multiple autoimmune diseases. Experimental autoimmune neuritis (EAN) is an animal model of Guillain-Barré syndrome, and the pathogenesis of EAN is mediated principally through T cells and macrophages...
November 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27784389/-expression-and-subcellular-distribution-of-costimulatory-molecules-b7-h1-b7-h3-and-b7-h4-in-human-hematologic-malignancy-cell-lines
#15
Wei Zhang, Jing Wang, Yan-Fang Wang, Ming-Xia Zhu, Wen-Li Wan, Hai-Shen Li, Fei-Fei Wu, Xin-Xing Yan, Xiao-Yan Ke
OBJECTIVE: To investigate the expression and subcellular distribution of costimulatory molecules B7-H1, B7-H3 and B7-H4 in human hematologic malignancy cell lines. METHODS: The expression and subcellular distribution of B7-H1, B7-H3 and B7-H4 in 13 human hematologic malignancy cell lines were determined by RT-PCR, qPCR, Western blot and flow cytometry, the peripheral blood mononuclear cells (PB MNC) of 12 volunteers were used as control. RESULTS: The mRNA of B7-H1, B7-H3 and B7-H4 was widely expressed in PB MNC and hematologic malignancy cell lines, with a lower level of B7-H4...
October 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/27777774/5-fluorouracil-upregulates-cell-surface-b7-h1-pd-l1-expression-in-gastrointestinal-cancers
#16
Lauren Van Der Kraak, Gaurav Goel, Krishnaveni Ramanan, Christof Kaltenmeier, Lin Zhang, Daniel P Normolle, Gordon J Freeman, Daolin Tang, Katie S Nason, Jon M Davison, James D Luketich, Rajeev Dhupar, Michael T Lotze
BACKGROUND: Resistance to chemotherapy is a major obstacle in the effective treatment of cancer patients. B7-homolog 1, also known as programmed death ligand-1 (PD-L1), is an immunoregulatory protein that is overexpressed in several human cancers. Interaction of B7-H1 with programmed death 1 (PD-1) prevents T-cell activation and proliferation, sequestering the T-cell receptor from the cell membrane, inducing T-cell apoptosis, thereby leading to cancer immunoresistance. B7-H1 upregulation contributes to chemoresistance in several types of cancer, but little is known with respect to changes associated with 5-fluorouracil (5-FU) or gastrointestinal cancers...
2016: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/27762043/tlr4-induced-b7-h1-on-keratinocytes-negatively-regulates-cd4-t-cells-and-cd8-t-cells-responses-in-oral-lichen-planus
#17
Jing Zhang, Ya-Qin Tan, Ming-Hui Wei, Xiao-Jing Ye, Guan-Ying Chen, Rui Lu, Ge-Fei Du, Gang Zhou
Oral lichen planus (OLP) is a T-cell-mediated autoimmune mucocutaneous disease affected by the interactions among the keratinocytes, CD4(+) T cells and CD8(+) T cells. B7-H1 induced by Toll-like receptors (TLRs), can suppress T cell immune reaction, thereby resulting in immune tolerance. However, the role of TLRs-mediated B7-H1 on keratinocytes in the immune response of OLP is still unknown. The present study showed that TLR4 could induce time-coursed B7-H1 expression on oral keratinocytes, and blocking NF-κB or PI3K/mTOR pathway down-regulated B7-H1 transcriptional expression...
October 20, 2016: Experimental Dermatology
https://www.readbyqxmd.com/read/27731324/unique-b7-h1-expression-on-masticatory-mucosae-in-the-oral-cavity-and-trans-coinhibition-by-b7-h1-expressing-keratinocytes-regulating-cd4-t-cell-mediated-mucosal-tissue-inflammation
#18
S Kang, C Zhang, T Ohno, M Azuma
The PD-1/B7-H1 pathway regulates immune responses and maintains homeostasis. Here, we identified a unique expression of B7 homolog 1 (B7-H1) on masticatory mucosae in the oral cavity. B7-H1 was physiologically expressed on the dorsal surface of the tongue, gingiva, and hard palate. Other squamous epithelia and other structures of the epithelia did not express B7-H1 in the steady state. Physiological B7-H1 expression on masticatory mucosae was limited on prickle cells, and its expression on basal keratinocytes (KCs) was strictly regulated...
October 12, 2016: Mucosal Immunology
https://www.readbyqxmd.com/read/27721121/withdrawn-tumor-b7-h3-cd276-expression-and-smoking-history-in-relation-to-lung-adenocarcinoma-prognosis
#19
Kentaro Inamura, Yusuke Yokouchi, Maki Kobayashi, Rie Sakakibara, Hironori Ninomiya, Sophia Subat, Hiroko Nagano, Kimie Nomura, Sakae Okumura, Tomoko Shibutani, Yuichi Ishikawa
The Publisher regrets that this article is an accidental duplication of an article that has already been published in The Journal of Lung Cancer - http://dx.doi.org/10.1016/j.lungcan.2016.11.013. Please see online announcement for additional details. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
December 10, 2016: Lung Cancer: Journal of the International Association for the Study of Lung Cancer
https://www.readbyqxmd.com/read/27671636/b7-h1-shapes-t-cell-mediated-brain-endothelial-cell-dysfunction-and-regional-encephalitogenicity-in-spontaneous-cns-autoimmunity
#20
Luisa Klotz, Ivan Kuzmanov, Stephanie Hucke, Catharina C Gross, Vilmos Posevitz, Angela Dreykluft, Andreas Schulte-Mecklenbeck, Claudia Janoschka, Maren Lindner, Martin Herold, Nicholas Schwab, Isis Ludwig-Portugall, Christian Kurts, Sven G Meuth, Tanja Kuhlmann, Heinz Wiendl
Molecular mechanisms that determine lesion localization or phenotype variation in multiple sclerosis are mostly unidentified. Although transmigration of activated encephalitogenic T cells across the blood-brain barrier (BBB) is a crucial step in the disease pathogenesis of CNS autoimmunity, the consequences on brain endothelial barrier integrity upon interaction with such T cells and subsequent lesion formation and distribution are largely unknown. We made use of a transgenic spontaneous mouse model of CNS autoimmunity characterized by inflammatory demyelinating lesions confined to optic nerves and spinal cord (OSE mice)...
October 11, 2016: Proceedings of the National Academy of Sciences of the United States of America
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