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Immunobiology

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https://www.readbyqxmd.com/read/29150026/regulatory-t-cells-friends-or-foe-in-human-mycobacterium-leprae-infection
#1
Ana T Chaves, Atvaldo F Ribeiro-Junior, Sandra Lyon, Nayara I Medeiros, Fábio Cassirer-Costa, Karina S Paula, Edilamar S Alecrim, Cristiane A S Menezes, Rodrigo Correa-Oliveira, Manoel O C Rocha, Juliana A S Gomes
Regulatory T cells (Tregs) are known to control immune responses by suppressing the antigen-presenting and effector T cells. Some mechanisms adopted by Tregs in combating Mycobacterium infections have been proposed. Nevertheless, in M. leprae infection, also known as leprosy or Hansen's disease, the role of Tregs has not been completely elucidated. Using multicolor flow cytometry, we evaluated the expression of different cell surface and intracellular molecules present in Tregs from peripheral blood samples of leprosy patients...
November 13, 2017: Immunobiology
https://www.readbyqxmd.com/read/29146235/macrophages-their-role-activation-and-polarization-in-pulmonary-diseases
#2
REVIEW
Shweta Arora, Kapil Dev, Beamon Agarwal, Pragnya Das, Mansoor Ali Syed
Macrophages, circulating in the blood or concatenated into different organs and tissues constitute the first barrier against any disease. They are foremost controllers of both innate and acquired immunity, healthy tissue homeostasis, vasculogenesis and congenital metabolism. Two hallmarks of macrophages are diversity and plasticity due to which they acquire a wobbling array of phenotypes. These phenotypes are appropriately synchronized responses to a variety of different stimuli from either the tissue microenvironment or - microbes or their products...
November 12, 2017: Immunobiology
https://www.readbyqxmd.com/read/29108874/corrigendum-to-hmgb1-modulates-lewis-cell-autophagy-and-promotes-cell-survival-via-rage-hmgb1-erk1-2-positive-feedback-during-nutrient-depletion-immunobiology-220-may-5-2015-539-44
#3
Z Su, T Wang, H Zhu, P Zhang, R Han, Y Liu, P Ni, H Shen, W Xu, H Xu
No abstract text is available yet for this article.
November 3, 2017: Immunobiology
https://www.readbyqxmd.com/read/29146236/infectious-bursal-disease-virus-protein-vp4-suppresses-type-i-interferon-expression-via-inhibiting-k48-linked-ubiquitylation-of-glucocorticoid-induced-leucine-zipper-gilz
#4
Zhiyuan He, Xiang Chen, Mengjiao Fu, Jun Tang, Xiaoqi Li, Hong Cao, Yongqiang Wang, Shijun J Zheng
Viruses have developed a variety of methods to evade host immune response. Our previous study showed that infectious bursal disease virus (IBDV) inhibited type I interferon production via interaction of VP4 with cellular glucocorticoid-induced leucine zipper (GILZ) protein. However, the exact underlying molecular mechanism is still unclear. In this study, we found that IBDV VP4 suppressed GILZ degradation by inhibiting K48-linked ubiquitylation of GILZ. Furthermore, mutation of VP4 (R41G) abolished the inhibitory effect of VP4 on IFN-β expression and GILZ ubiquitylation, indicating that the amino acid 41R of VP4 was required for the suppression of IFN-β expression and GILZ ubiquitylation...
October 28, 2017: Immunobiology
https://www.readbyqxmd.com/read/29126656/the-effect-of-i%C3%AE%C2%BAk-16-on-lipopolysaccharide-induced-impaired-monocytes
#5
Norman J Galbraith, Stephen Manek, Samuel Walker, Campbell Bishop, Jane V Carter, Meredith Cahill, Sarah A Gardner, Hiram C Polk, Susan Galandiuk
This study focuses on impaired monocyte function, which occurs in some patients after trauma, major elective surgery, or sepsis. This monocyte impairment increases the risk of secondary infection and death. We aimed to determine the influence IκK-16 had on monocytes using an ex-vivo model of human monocyte impairment. We included the effects of the well-studied comparators interferon-gamma (IFN-γ) and granulocyte-macrophage colony-stimulating factor (GM-CSF) on impaired monocytes. Primary human monocytes were stimulated with 10ng/mL of lipopolysaccharide (LPS) for 16h and then challenged with 100ng/mL LPS to assess the monocyte inflammatory response...
October 28, 2017: Immunobiology
https://www.readbyqxmd.com/read/29111316/concentrations-of-sp-a-and-hsp70-are-associated-with-polarization-of-macrophages-in-pleural-effusions-of-non-small-cell-lung-cancer
#6
Mariusz Kaczmarek, Malgorzata Lagiedo, Agnieszka Masztalerz, Magdalena Kozlowska, Agata Nowicka, Beata Brajer, Halina Batura-Gabryel, Jan Sikora
Damage-associated molecular pattern (DAMP) molecules can initiate an immune response through Toll-like receptors (TLRs). DAMPs are released from cells as a response to the extracellular danger and can be by-products of tissue damage. In cancer microenvironment necrotic cells release debris which has potency to become DAMPs. Non-small cell lung cancer (NSCLC) is often accompanied by pleural effusion (PE), which contains a variety of DAMPs. Surfactant protein A (SP-A) and heat shock protein 70 (Hsp70) are important DAMPs in the respiratory tract...
October 27, 2017: Immunobiology
https://www.readbyqxmd.com/read/29111315/protective-role-of-peroxisome-proliferator-activated-receptor-%C3%AE-agonists-in-skin-barrier-and-inflammation
#7
REVIEW
Kazuhisa Furue, Chikage Mitoma, Gaku Tsuji, Masutaka Furue
Peroxisome proliferator-activated receptor α (PPARα) is one of the three isoforms of PPARs, which are ligand-activated nuclear transcription factors. PPARα is highly expressed in liver and its agonists are widely used to treat hyperlipidemia. Epidermal keratinocytes express all three isoforms (α, β/δ, and γ) of PPARs and PPARα is particularly important for regulating the epidermal barrier and inflammation. Agonistic ligation of PPARα protects the epidermal barrier function and inhibits the inflammatory response in dermatitis...
October 27, 2017: Immunobiology
https://www.readbyqxmd.com/read/29096944/an-in-vitro-inflammation-model-to-study-the-nrf2-and-nf-%C3%AE%C2%BAb-crosstalk-in-presence-of-ferulic-acid-as-modulator
#8
Nadia Lampiasi, Giovanna Montana
The aim of this study was to evaluate the crosstalk between Nrf2 and NF-κB signaling pathways and to explore the modulating activity actuated by ferulic acid. In the inflammation process, a key player is the nuclear factor-κB (NF-κB) transcription factor pathway. On the contrary, the activation of Nrf2 inhibits inflammation and impairs degenerative disease providing an interface between redox and anti-inflammatory responses. Recent studies have demonstrated that protein phosphorylation of IKK complex is a potential mechanism for the activation of both Nrf2 and NF-κB pathways...
October 27, 2017: Immunobiology
https://www.readbyqxmd.com/read/29092744/dual-requirement-for-stat-signaling-in-dendritic-cell-immunobiology
#9
Gloria Donninelli, Isabella Sanseverino, Cristina Purificato, Sandra Gessani, Maria Cristina Gauzzi
Dendritic cells (DC) represent an attractive target for therapeutic manipulation of the immune system and enhancement of insufficient immune response in cancer. STAT family members play key roles in the differentiation and activation of DC, a feature that is currently being exploited in DC-based therapies. We previously reported that the small-molecule Stattic, originally developed as a STAT3-specific inhibitor, also inhibits STAT1 and STAT2 phosphorylation in DC exposed to cytokines or LPS. Aim of this study was to investigate the functional consequences of in vitro treatment with Stattic on DC immunobiology...
October 27, 2017: Immunobiology
https://www.readbyqxmd.com/read/29113699/involvement-of-caspase-4-in-il-1-beta-production-and-pyroptosis-in-human-macrophages-during-dengue-virus-infection
#10
Ka Tik Cheung, Daniel Man-Yuen Sze, Kwok Hung Chan, Polly Hang-Mei Leung
Caspase-4 physically interacts with caspase-1 and is believed to be a proinflammatory caspase that can induce the inflammatory form of programmed cell death (pyroptosis) and the release of mature interleukin (IL)-1β. However, the function of caspase-4 in dengue virus infection is not yet fully understood. We examined the function of caspase-4 in IL-1β production and pyroptosis during dengue virus serotype-2 (DENV-2) infection in human macrophages. In this study, DENV-2 infection increased IL-1β protein level with activated caspase-4 activity...
October 26, 2017: Immunobiology
https://www.readbyqxmd.com/read/29089144/adenoviral-vector-mediated-gm-csf-gene-transfer-improves-anti-mycobacterial-immunity-in-mice-role-of-regulatory-t-cells
#11
Alena Singpiel, Julia Kramer, Regina Maus, Jennifer Stolper, Lara Friederike Bittersohl, Jack Gauldie, Martin Kolb, Tobias Welte, Tim Sparwasser, Ulrich A Maus
Granulocyte macrophage-colony stimulating factor (GM-CSF) is a hematopoietic growth factor involved in differentiation, survival and activation of myeloid and non-myeloid cells with important implications for lung antibacterial immunity. Here we examined the effect of pulmonary adenoviral vector-mediated delivery of GM-CSF (AdGM-CSF) on anti-mycobacterial immunity in M. bovis BCG infected mice. Exposure of M. bovis BCG infected mice to AdGM-CSF either applied on 6h, or 6h and 7days post-infection substantially increased alveolar recruitment of iNOS and IL-12 expressing macrophages, and significantly increased accumulation of IFNγ(pos) T cells and particularly regulatory T cells (Tregs)...
October 26, 2017: Immunobiology
https://www.readbyqxmd.com/read/29074301/identification-of-immune-biomarkers-related-to-disease-progression-and-treatment-efficacy-in-human-visceral-leishmaniasis
#12
Áquila S B Portela, Lourena E Costa, Beatriz C S Salles, Mariana P Lima, Thaís T O Santos, Fernanda F Ramos, Daniela P Lage, Vívian T Martins, Rachel B Caligiorne, Daniela R Lessa, Fabiana R Silva, Amanda S Machado, Guilherme F Nascimento, Isabela S Gama, Miguel A Chávez-Fumagalli, Antonio L Teixeira, Manoel O C Rocha, Regina L Rocha, Eduardo A F Coelho
Visceral leishmaniasis (VL) is a potentially fatal disease, in which the treatment based on chemotherapy is considered toxic. The cure of disease is associated with the life-long Th1-type immunity against the infection. The Th1-related cytokines production by peripheral blood mononuclear cells (PBMCs) seems to be crucial for host control of parasite load and clinical cure. In the current study, we used five proteins (IgE-dependent histamine-releasing factor [HRF], LiHyD, LiHyV, LiHyT and LiHyp6) recently shown to be antigenic and/or immunogenic in the canine VL, aiming to evaluate the antigen-specific antibody levels and cytokine production in PBMCs culture supernatants collected from VL patients before and after anti-VL treatment...
October 20, 2017: Immunobiology
https://www.readbyqxmd.com/read/29107382/human-monoclonal-antibodies-neutralizing-influenza-virus-a-h1n1pdm09-and-seasonal-a-h1n1-strains-distinct-ig-gene-repertoires-with-a-similar-action-mechanism
#13
Satoshi Hiroi, Motoki Kuhara, Yoshiro Kishi, Ken-Ichiro Ono, Shun Matsuzawa, Naomasa Yamamoto, Jun Komano
Influenza virus causes acute respiratory infection in humans, and is a major public health concern globally. Antibodies play a central role in host protection against influenza virus. We isolated human monoclonal antibodies (hMAb) 206-2-4 and 201-6-8 by a human hybridoma protocol that neutralized various but distinct influenza virus (IFV) A/H1N1 strains, including 2009 pandemic strains. The half-inhibitory concentration of 206-2-4 and 201-6-8 against A/H1N1pdm09 strains was 2-100ng/mL and 5-20μg/mL, respectively...
October 18, 2017: Immunobiology
https://www.readbyqxmd.com/read/29074302/endogenous-antibody-responses-to-mucin-1-in-a-large-multiethnic-cohort-of-patients-with-breast-cancer-and-healthy-controls-role-of-immunoglobulin-and-fc%C3%AE-receptor-genes
#14
Janardan P Pandey, Aryan M Namboodiri, Bethany Wolf, Motoki Iwasaki, Yoshio Kasuga, Gerson S Hamada, Shoichiro Tsugane
High levels of naturally occurring IgG antibodies to mucin 1 (MUC1), a membrane-bound glycoprotein that is overexpressed in patients with breast cancer, are associated with good prognosis. This suggests that endogenous anti-MUC1 antibodies have a protective effect and, through antibody-mediated host immunosurveillance mechanisms, might contribute to a cancer-free state. To test this possibility, we characterized a large number of multiethnic patients with breast cancer and matched controls for IgG antibodies to MUC1...
October 18, 2017: Immunobiology
https://www.readbyqxmd.com/read/29074300/dendritic-cells-pulsed-with-pythium-insidiosum-1-3-1-6-%C3%AE-glucan-heat-inactivated-zoospores-and-immunotherapy-prime-na%C3%A3-ve-t-cells-to-th1-differentiation-in-vitro
#15
Pauline C Ledur, Juliana S M Tondolo, Francielli P K Jesus, Camila M Verdi, Érico S Loreto, Sydney H Alves, Janio M Santurio
Pythiosis is a life-threatening disease caused by the fungus-like microorganism Pythium insidiosum that can lead to death if not treated. Since P. insidiosum has particular cell wall characteristics, pythiosis is difficult to treat, as it does not respond well to traditional antifungal drugs. In our study, we investigated a new immunotherapeutic approach with potential use in treatment and in the acquisition of immunity against pythiosis. Dendritic cells from both human and mouse, pulsed with P. insidiosum heat-inactivated zoospore, (1,3)(1,6)-β-glucan and the immunotherapeutic PitiumVac(®) efficiently induced naïve T cell differentiation in a Th1 phenotype by the activation of specific Th1 cytokine production in vitro...
October 18, 2017: Immunobiology
https://www.readbyqxmd.com/read/29107385/ccl2-conditionally-determines-ccl22-dependent-th2-accumulation-during-tgf-%C3%AE-induced-breast-cancer-progression
#16
Palash Kumar Mandal, Subir Biswas, Gunjan Mandal, Suman Purohit, Arnab Gupta, Amita Majumdar Giri, Sougata Roy Chowdhury, Arindam Bhattacharyya
We investigated expressions of -CC chemokine ligand 2 (CCL2) and CCL5 in tumor samples from 147 breast cancer (BCa) patients and correlated with transforming growth factor-β (TGF-β) expression. We observed an inverse correlation of TGF-β expression with CCL2, CCL5 expression in early stages of BCa. On contrary, in late stages, CCL2, not CCL5, expression was found to be directly proportional with TGF-β expression. TGF-β stimulated MDA-MB-231 cells to express CCL2, however, downregulated both CCL2 and CCL5 in MCF-7...
October 16, 2017: Immunobiology
https://www.readbyqxmd.com/read/29102048/ethyl-pyruvate-reduces-acute-lung-damage-following-trauma-and-hemorrhagic-shock-via-inhibition-of-nf-%C3%AE%C2%BAb-and-hmgb1
#17
Borna Relja, Nils Wagner, Niklas Franz, Scott Dieteren, Katharina Mörs, Julia Schmidt, Ingo Marzi, Mario Perl
OBJECTIVE: After blunt thoracic trauma (TxT) and hemorrhagic shock with resuscitation (H/R) intense local inflammatory response and cell loss frequently impair the pulmonary function. Ethyl pyruvate (EP) has been reported to improve the pathophysiologic derangements in models of acute inflammation. Here, we studied the effects of EP on inflammation and lung damage after TxT+H/R. METHODS: Twenty four female Lewis rats (180-240g) were randomly divided into 3 groups: two groups underwent TxT followed by hemorrhagic shock (35±3mmHg) for 60min and resuscitation with either Ringers-Lactat (RL) alone or RL supplemented with EP (EP, 50mg/kg)...
October 16, 2017: Immunobiology
https://www.readbyqxmd.com/read/29079219/house-dust-mite-allergy-its-innate-immune-response-and-immunotherapy
#18
REVIEW
Fang-Liang Huang, En-Chih Liao, Sheng-Jie Yu
Over the past few decades, allergic diseases have become increasingly prevalent worldwide. House dust mite (HDM) is the most important domestic source for allergic diseases such as allergic rhinitis, asthma and atopic dermatitis. Dermatophagoides pteronyssinus (Der p) is the major environmental allergen in southeast Asia because of the humid and warm environment is suitable for its growth. In the recent year, role of HDM allergen in allergic inflammation through innate immune system has been well studied. Toll-like receptors (TLRs), protease-activated receptors (PARs) and DC-SIGN could be activated by different HDM major allergens and proinflammatory cytokines also be upregulated...
October 16, 2017: Immunobiology
https://www.readbyqxmd.com/read/29070439/amyloid-and-immune-homeostasis
#19
REVIEW
Ying-Hui Wang, Yu-Gen Zhang
Extracellular amyloid deposition defines a range of amyloidosis and amyloid-related disease. Addition to primary and secondary amyloidosis, amyloid-related disease can be observed in different tissue/organ that sharing the common pathogenesis based on the formation of amyloid deposition. Currently, both Alzheimer's disease and type 2 diabetes can be diagnosed with certainly only based on the autopsy results, by which amyloidosis of the associative tissue/organ is observed. Intriguingly, since it demonstrated that amyloid deposits trigger inflammatory reaction through the activation of cascaded immune response, wherein several lines of evidence implies a protective role of amyloid in preventing autoimmunity...
October 16, 2017: Immunobiology
https://www.readbyqxmd.com/read/29066255/comparative-analysis-of-microbial-sensing-molecules-in-mucosal-tissues-with-aging
#20
O A Gonzalez, S Kirakodu, M J Novak, A J Stromberg, L Orraca, J Gonzalez-Martinez, A Burgos, J L Ebersole
Host-bacterial interactions at mucosal surfaces require recognition of the bacteria by host cells enabling targeted responses to maintain tissue homeostasis. It is now well recognized that an array of host-derived pattern recognition receptors (PRRs), both cell-bound and soluble, are critical to innate immune engagement of microbes via microbial-associated molecular patterns (MAMP). This report describes the use of a nonhuman primate model to evaluate changes in the expression of these sensing molecules related to aging in healthy gingival tissues...
October 16, 2017: Immunobiology
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