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https://www.readbyqxmd.com/read/28231392/from-dendritic-cells-to-b-cells-dysfunctions-during-hiv-1-infection-tfh-at-the-cross-road
#1
REVIEW
Nicolas Ruffin, Lylia Hani, Nabila Seddiki
T follicular helper (Tfh) cells are essential for B cell differentiation and the subsequent antibody responses. Their numbers and functions are altered during human and simian immunodeficiency virus (HIV/SIV) infections. In lymphoid tissues, Tfh cells are present in germinal center, where they are the main source of replicative HIV-1 and represent a major reservoir. Paradoxically, Tfh numbers are increased in chronically infected individuals. Understanding the fate of Tfh cells in the course of HIV-1 infection is essential for the design of efficient strategies toward a protective HIV vaccine or a cure...
February 23, 2017: Immunology
https://www.readbyqxmd.com/read/28222218/reduced-inflammatory-responses-of-follicular-helper-t-cell-promote-the-development-of-regulatory-b-cells-after-roux-en-y-gastric-bypass
#2
Junfang Zhan, Liyu Huang, Haiyong Ma, Huan Chen, Yuan Yang, Sheng Tan, Wendy Song, Weiguo Zhao, Xiaojiang Dai
Bariatric surgery is currently the most effective strategy in treating severe obesity and its comorbidities, such as type 2 diabetes (T2D). However, the mechanism through which bariatric surgery mediates its benefits is not completely understood. Since obesity and T2D represent yet another inflammatory disease, and follicular helper T (Tfh) cells play important roles in inflammatory disorders, we investigated whether the Tfh activity was altered after Roux-en-Y gastric bypass (RYGB), one of the most common bariatric surgery procedures...
February 21, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28219887/disruption-of-pathogenic-cellular-networks-by-il-21-blockade-leads-to-disease-amelioration-in-murine-lupus
#3
Jin-Young Choi, Abhinav Seth, Michael Kashgarian, Sonia Terrillon, Emma Fung, Lili Huang, Li Chun Wang, Joe Craft
Systemic lupus erythematosus (lupus) is characterized by autoantibody-mediated organ injury. Follicular Th (Tfh) cells orchestrate physiological germinal center (GC) B cell responses, whereas in lupus they promote aberrant GC responses with autoreactive memory B cell development and plasma cell-derived autoantibody production. IL-21, a Tfh cell-derived cytokine, provides instructional cues for GC B cell maturation, with disruption of IL-21 signaling representing a potential therapeutic strategy for autoantibody-driven diseases such as systemic lupus erythematosus...
February 20, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28207489/b-cell-abnormalities-and-impact-on-antibody-response-in-hiv-infection
#4
Alessandra Noto, Giuseppe Pantaleo
PURPOSE OF REVIEW: The purpose of the present review is to provide an update on the current development in the field of broadly neutralizing antibodies (bNabs) and their potential use in the prevention and therapeutic settings, and an evaluation of the B-cell abnormalities that may impair antibody responses in HIV infection. RECENT FINDINGS: Major advances have been achieved in the characterization of bNabs directed against different vulnerable regions of HIV Envelope (Env)...
February 15, 2017: Current Opinion in HIV and AIDS
https://www.readbyqxmd.com/read/28202459/il-4-cxcl12-loop-is-a-key-regulator-of-lymphoid-stroma-function-in-follicular-lymphoma
#5
Shubham Pandey, Frédéric Mourcin, Tony Marchand, Saba Nayar, Marion Guirriec, Céline Pangault, Céline Monvoisin, Patricia Amé-Thomas, Fabien Guilloton, Joelle Dulong, Mark Coles, Thierry Fest, Anja Mottok, Francesca Barone, Karin Tarte
Follicular lymphoma (FL) is the most frequent indolent lymphoma and is characterized by the accumulation of germinal center-derived malignant B cells engaged in a bidirectional crosstalk with their supportive microenvironment in invaded lymph nodes (LN) and bone marrow (BM). T follicular helper cells (TFH) and infiltrating stromal cells have been shown to favor FL B-cell growth but the mechanisms of their protumoral effect and how LN/BM microenvironment is converted into a lymphoma-permissive cell niche remain poorly understood...
February 15, 2017: Blood
https://www.readbyqxmd.com/read/28194154/the-role-of-cd4-t-follicular-helper-cells-in-hiv-infection-from-the-germinal-center-to-the-periphery
#6
REVIEW
John Patrick Thornhill, Sarah Fidler, Paul Klenerman, John Frater, Chansavath Phetsouphanh
T follicular helper cells (TFh) are key components of the adaptive immune system; they are primarily found in germinal centers (GCs) where their interaction with B cells supports humoral immune responses and efficient antibody production. They are defined by the expression of CXC receptor 5, program death-1, ICOS, and secretion of IL-21. Their differentiation is regulated by B-cell lymphoma 6. The relationship and function of circulating TFh to bona fide TFh resident in the GC is much debated. HIV infection impacts the TFh response with evidence of aberrant TFh function observed in acute and chronic infection...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28183589/terbinafine-loaded-wound-dressing-for-chronic-superficial-fungal-infections
#7
Farnoush Asghari Paskiabi, Shahin Bonakdar, Mohammad Ali Shokrgozar, Mohammad Imani, Zahra Jahanshiri, Masoomeh Shams-Ghahfarokhi, Mehdi Razzaghi-Abyaneh
In spite of developing new drugs and modern formulations, the treatments of chronic fungal infections are still challenging. Fibrous wound dressings are new suggestions for the treatment of chronic superficial infections. In the present study, we formulated an antifungal agent, terbinafine hydrochloride (TFH), which is a hydrophobic drug, in wound dressings prepared by electrospun polycaprolactone, polycaprolactone/gelatin (50:50 w/w) and gelatin. To obtain more water-stable meshes, the preparations were treated by glutaraldehyde and their properties were determined before and after treatment...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28159893/dynamics-of-siv-specific-cxcr5-cd8-t-cells-during-chronic-siv-infection
#8
Geetha H Mylvaganam, Daniel Rios, Hadia M Abdelaal, Smita Iyer, Gregory Tharp, Maud Mavinger, Sakeenah Hicks, Ann Chahroudi, Rafi Ahmed, Steven E Bosinger, Ifor R Williams, Pamela J Skinner, Vijayakumar Velu, Rama R Amara
A significant challenge to HIV eradication is the elimination of viral reservoirs in germinal center (GC) T follicular helper (Tfh) cells. However, GCs are considered to be immune privileged for antiviral CD8 T cells. Here, we show a population of simian immunodeficiency virus (SIV)-specific CD8 T cells express CXCR5 (C-X-C chemokine receptor type 5, a chemokine receptor required for homing to GCs) and expand in lymph nodes (LNs) following pathogenic SIV infection in a cohort of vaccinated macaques. This expansion was greater in animals that exhibited superior control of SIV...
February 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28153782/rapid-de-novo-generation-of-antigen-specific-human-b-cells-with-expression-of-blimp-1-and-aid-by-in-vitro-immunization
#9
Xu Fang, Yue Tong, Hong Tian, Hongyu Ning, Xiangdong Gao, Wenbing Yao
In vitro immunization with antigens and cytokines triggers specific human B-cell response in short periods and is therefore superior to conventional in vivo immunization for antibody development. However, this new technology is limited by low efficiency, poor reproducibility, and requirement of pre-immunized lymphocytes. In this study, we demonstrate a novel method for de novo inducing antigen-specific human B cells in vitro. Unlike previous in vitro immunization of unfractionated PBMCs, we firstly optimized the conditions for inducing monocyte-derived dendritic cells (DCs) to efficiently capture, process, and present antigens...
March 1, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28150814/p-selectin-preserves-immune-tolerance-in-mice-and-is-reduced-in-human-cutaneous-lupus
#10
Rafael González-Tajuelo, Javier Silván, Alicia Pérez-Frías, María de la Fuente-Fernández, Reyes Tejedor, Marina Espartero-Santos, Esther Vicente-Rabaneda, Ángeles Juarranz, Cecilia Muñoz-Calleja, Santos Castañeda, Carlos Gamallo, Ana Urzainqui
Mice deficient in P-Selectin presented altered immunity/tolerance balance. We have observed that the absence of P-Selectin promotes splenomegaly with reduced naïve T cell population, elevated activated/effector T cell subset, increased germinal center B and Tfh populations and high production of autoreactive antibodies. Moreover, 1.5-3-month-old P-selectin KO mice showed reduced IL-10-producing leukocytes in blood and a slightly reduced Treg population in the skin. With aging and, coinciding with disease severity, there is an increase in the IL17(+) circulating and dermal T cell subpopulations and reduction of dermal Treg...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28149882/simian-immunodeficiency-virus-confounds-t-follicular-helper-t-cells-and-the-germinal-centre
#11
COMMENT
Tom N Lea-Henry, Simon H Jiang
Yamamoto et al. have studied T follicular helper (TFH) and germinal centre (GC) responses after infection of rhesus macaques (RM) infected with simian immunodeficiency virus (SIV). In this study the authors examined the behaviour of TFH, reproducing infection-associated TFH accumulation and their association with the quality of antibody responses against cross-clade viral epitopes. The authors correlate TFHIL4 and CD154 expression with superior antibody responses. Accumulation of TFH was accompanied by aberrant expression of non-TFH transcriptional regulators such as BLIMP1 in TFH, suggesting viral induced abnormalities may affect TFH function...
December 2016: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28149160/immune-characteristics-study-of-ag490-a-signal-pathway-inhibitor-in-eae-model-mice
#12
Zhihua Zhao, Zhifeng Mao, Junjie Yin, Yaqing Shu, Wei Qiu, Zhengqi Lu, Xueqiang Hu
Multiple sclerosis (MS) is an autoimmune disease characterized by demyelination, axonal damage and progressive neurologic dysfunction in central nervous system (CNS). Many evidences show that B cells play an important role in the pathogenesis of MS. Follicular helper T cells (Tfh) secrete IL-21 to prompt the proliferation and differentiation of B cells in germinal center (GC) through clonal proliferation, somatic hypermutation, antibody class switching, antibody affinity maturation process. AG490 is a synthetic inhibitor to JAK-STAT signal pathway, which has been studied in inflammatory, tumor and autoimmune diseases...
February 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28148302/blood-chemokine-profile-in-untreated-early-rheumatoid-arthritis-cxcl10-as-a-disease-activity-marker
#13
Jayesh M Pandya, Anna-Carin Lundell, Kerstin Andersson, Inger Nordström, Elke Theander, Anna Rudin
BACKGROUND: We have recently analyzed the profile of T-cell subtypes based on chemokine receptor expression in blood from untreated early rheumatoid arthritis (ueRA) patients compared to healthy controls (HC). Here, we compared the levels of the respective chemokines in blood plasma of ueRA patients with those of HC. We also studied the association of chemokine levels with the proportions of circulating T-cell subsets and the clinical disease activity. METHODS: Peripheral blood was obtained from 43 patients with ueRA satisfying the ACR 2010 criteria and who had not received any disease-modifying anti-rheumatic drugs (DMARD) or prednisolone, and from 14 sex- and age-matched HC...
February 2, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28138558/circulating-cxcr5-cxcr3-pd-1-lo-tfh-like-cells-in-hiv-1-controllers-with-neutralizing-antibody-breadth
#14
Enrique Martin-Gayo, Jacqueline Cronin, Taylor Hickman, Zhengyu Ouyang, Madelene Lindqvist, Kellie E Kolb, Julian Schulze Zur Wiesch, Rafael Cubas, Filippos Porichis, Alex K Shalek, Jan van Lunzen, Elias K Haddad, Bruce D Walker, Daniel E Kaufmann, Mathias Lichterfeld, Xu G Yu
HIV-1-specific broadly neutralizing antibodies (bnAbs) typically develop in individuals with continuous high-level viral replication and increased immune activation, conditions that cannot be reproduced during prophylactic immunization. Understanding mechanisms supporting bnAb development in the absence of high-level viremia may be important for designing bnAb-inducing immunogens. Here, we show that the breadth of neutralizing antibody responses in HIV-1 controllers was associated with a relative enrichment of circulating CXCR5(+)CXCR3(+)PD-1(lo) CD4(+) T cells...
January 26, 2017: JCI Insight
https://www.readbyqxmd.com/read/28133804/immunologic-characteristics-of-hiv-infected-individuals-who-make-broadly-neutralizing-antibodies
#15
REVIEW
Persephone Borrow, M Anthony Moody
Induction of broadly neutralizing antibodies (bnAbs) capable of inhibiting infection with diverse variants of human immunodeficiency virus type 1 (HIV-1) is a key, as-yet-unachieved goal of prophylactic HIV-1 vaccine strategies. However, some HIV-infected individuals develop bnAbs after approximately 2-4 years of infection, enabling analysis of features of these antibodies and the immunological environment that enables their induction. Distinct subsets of CD4(+) T cells play opposing roles in the regulation of humoral responses: T follicular helper (Tfh) cells support germinal center formation and provide help for affinity maturation and the development of memory B cells and plasma cells, while regulatory CD4(+) (Treg) cells including T follicular regulatory (Tfr) cells inhibit the germinal center reaction to limit autoantibody production...
January 2017: Immunological Reviews
https://www.readbyqxmd.com/read/28133798/tfh-cells-and-hiv-bnabs-an-immunodominance-model-of-the-hiv-neutralizing-antibody-generation-problem
#16
REVIEW
Colin Havenar-Daughton, Jeong Hyun Lee, Shane Crotty
The generation of HIV bnAbs may be one of the greatest feats of the human immune system and our best hope of finally creating an HIV vaccine. The striking amount of somatic hypermutation in HIV bnAbs led to the hypothesis that T follicular helper (Tfh) cells and germinal centers (GC) play a critical role in the ability of the immune system to generate these uncommon antibodies. In this review, we first summarize what is known about the immunological process of HIV bnAb development, the challenges of eliciting bnAbs via immunizations, and the putative central roles of Tfh cells and GC in the generation of HIV bnAbs...
January 2017: Immunological Reviews
https://www.readbyqxmd.com/read/28130500/synthetic-retinoid-am80-ameliorates-lung-and-arthritic-autoimmune-responses-by-inhibiting-t-follicular-helper-and-th17-cell-responses
#17
Debdut Naskar, Fei Teng, Krysta M Felix, C Pierce Bradley, Hsin-Jung Joyce Wu
Rheumatoid arthritis is an autoimmune disorder that affects the joints and other organs. Pulmonary complications contribute significantly to rheumatoid arthritis mortality. Retinoic acid and its synthetic compound AM80 play roles in immunoregulation but their effect on mucosal autoimmunity remains largely unknown. T follicular helper (Tfh) and Th17 cells are known to promote inflammation and autoantibody production. Using the K/BxN autoimmune arthritis model, we elucidate a novel mechanism whereby oral AM80 administration suppressed lung mucosa-associated Tfh and autoantibody responses by increasing the gut-homing α4β7 integrin expression on Tfh cells...
March 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28130496/induction-of-il21-in-peripheral-t-follicular-helper-cells-is-an-indicator-of-influenza-vaccine-response-in-a-previously-vaccinated-hiv-infected-pediatric-cohort
#18
Lesley R de Armas, Nicola Cotugno, Suresh Pallikkuth, Li Pan, Stefano Rinaldi, M Celeste Sanchez, Louis Gonzalez, Alberto Cagigi, Paolo Rossi, Paolo Palma, Savita Pahwa
HIV-infected patients of all ages frequently underperform in response to seasonal influenza vaccination, despite virologic control of HIV. The molecular mechanisms governing this impairment, as well as predictive biomarkers for responsiveness, remain unknown. This study was performed in samples obtained prevaccination (T0) from HIV-infected children who received the 2012-2013 seasonal influenza vaccine. Response status was determined based on established criterion for hemagglutination inhibition titer; participants with a hemagglutination titer ≥1:40 plus a ≥4-fold increase over T0 at 3 wk postvaccination were designated as responders...
March 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28130401/distinctive-histogenesis-and-immunological-microenvironment-based-on-transcriptional-profiles-of-follicular-dendritic-cell-sarcomas
#19
Maria Antonella Laginestra, Claudio Tripodo, Claudio Agostinelli, Giovanna Motta, Sylvia Hartmann, Claudia Doring, Maura Rossi, Federica Melle, Maria Rosaria Sapienza, Valentina Tabanelli, Alessandro Pileri, Fabio Fuligni, Anna Gazzola, Claudia Mannu, Carlo Alberto Sagramoso, Silvia Lonardi, Luisa Lorenzi, Francesco Bacci, Elena Sabattini, Anita Borges, Ingrid Simonitsch-Klupp, Jose Cabecadas, Elias Campo, Juan Rosai, Martin-Leo Hansmann, Fabio Facchetti, Stefano Aldo Pileri
: Follicular dendritic cell (FDC) sarcomas are rare mesenchymal tumors (MTs) with variable clinical, morphologic and phenotypic characteristics. Transcriptome analysis was performed on multiple FDC sarcomas and compared to other MTs, microdissected Castleman FDCs, and normal fibroblasts. Using unsupervised analysis, FDC sarcomas clustered with microdissected FDCs, distinct from other MTs and fibroblasts. The specific endowment of FDC-related gene expression programs in FDC sarcomas emerged by applying a gene signature of differentially expressed genes (n=1,289) between microdissected FDCs and fibroblasts...
January 27, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28125450/clinicopathological-study-of-30-cases-of-peripheral-t-cell-lymphoma-with-hodgkin-and-reed-sternberg-like-b-cells-from-japan
#20
Ahmed E Eladl, Akira Satou, Ahmed Ali Elsayed, Yuka Suzuki, Seiichi Kato, Naoko Asano, Shigeo Nakamura
The presence of Hodgkin and Reed-Sternberg (HRS)-like B-cells in peripheral T-cell lymphoma (PTCL) is rare and its clinicopathological features still remain unclear. Here, we describe 30 cases of PTCL with HRS-like B-cells from Japan. Twenty-three cases (77%) presented evidence of follicular T-helper phenotype (TFH) derivation: 12 were angioimmunoblastic T-cell lymphoma and 11 PTCL with TFH phenotype (PTCL-TFH). The remaining seven cases were diagnosed as PTCL, not otherwise specified (PTCL-NOS). Epstein-Barr virus (EBV) reactivation was detected in 25 cases (83%), but HRS-like B-cells were EBER in only 20 cases (67%)...
January 25, 2017: American Journal of Surgical Pathology
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