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Vaccination in HIV

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https://www.readbyqxmd.com/read/28934310/sanger-and-next-generation-sequencing-data-for-characterization-of-ctl-epitopes-in-archived-hiv-1-proviral-dna
#1
Camille Tumiotto, Lionel Riviere, Pantxika Bellecave, Patricia Recordon-Pinson, Alice Vilain-Parce, Gwenda-Line Guidicelli, Hervé Fleury
One of the strategies for curing viral HIV-1 is a therapeutic vaccine involving the stimulation of cytotoxic CD8-positive T cells (CTL) that are Human Leucocyte Antigen (HLA)-restricted. The lack of efficiency of previous vaccination strategies may have been due to the immunogenic peptides used, which could be different from a patient's virus epitopes and lead to a poor CTL response. To counteract this lack of specificity, conserved epitopes must be targeted. One alternative is to gather as many data as possible from a large number of patients on their HIV-1 proviral archived epitope variants, taking into account their genetic background to select the best presented CTL epitopes...
2017: PloS One
https://www.readbyqxmd.com/read/28933684/screening-of-primary-gp120-immunogens-to-formulate-the-next-generation-polyvalent-dna-prime-protein-boost-hiv-1-vaccines
#2
Shixia Wang, Te-Hui Wu, Anthony Hackett, Veronica Efros, Yan Wang, Dong Han, Aaron Wallace, Yuxin Chen, Guangnan Hu, Shuying Liu, Paul Clapham, James Arthos, David Montefiori, Shan Lu
Our previous preclinical studies and a Phase I clinical trial DP6-001 have indicated that a polyvalent Env formulation was able to elicit broadly reactive antibody responses including low titer neutralizing antibody responses against viral isolates of subtypes A, B, C and AE. In the current report, a panel of 62 gp120 immunogens were screened in a rabbit model to identify gp120 immunogens that can elicit improved binding and neutralizing antibody responses and some of them can be included in the next polyvalent formulation...
September 21, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28933644/development-and-optimization-of-a-sensitive-pseudovirus-based-assay-for-hiv-1-neutralizing-antibodies-detection-using-a3r5-cells
#3
Qingqing Chen, Jianhui Nie, Weijin Huang, Yanmei Jiao, Lan Li, Tong Zhang, Juan Zhao, Hao Wu, Youchun Wang
Sensitive assays for HIV-1 neutralizing antibody detection are urgently needed for vaccine immunogen optimization and identification of protective immune response levels. In this study, we developed an easy-to-use HIV-1 pseudovirus neutralization assay based on a human CD4(+) lymphoblastoid cell line A3R5 by employing a high efficient pseudovirus production system. Optimal conditions for cell counts, infection time, virus dose and concentration of DEAE-dextran were tested and identified. For T-cell line-adapted tier 1 virus strains, significantly higher inhibitory efficiency was observed for both monoclonal neutralizing antibody (4 fold) and plasma (2 fold) samples in A3R5 than those in TZM-bl assay...
September 21, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28931639/trispecific-broadly-neutralizing-hiv-antibodies-mediate-potent-shiv-protection-in-macaques
#4
Ling Xu, Amarendra Pegu, Ercole Rao, Nicole Doria-Rose, Jochen Beninga, Krisha McKee, Dana M Lord, Ronnie R Wei, Gejing Deng, Mark Louder, Stephen D Schmidt, Zachary Mankoff, Lan Wu, Mangaiarkarasi Asokan, Christian Beil, Christian Lange, Wulf Dirk Leuschner, Jochen Kruip, Rebecca Sendak, Young Do Kwon, Tongqing Zhou, Xuejun Chen, Robert T Bailer, Keyun Wang, Misook Choe, Lawrence J Tartaglia, Dan H Barouch, Sijy O'Dell, John-Paul Todd, Dennis R Burton, Mario Roederer, Mark Connors, Richard A Koup, Peter D Kwong, Zhi-Yong Yang, John R Mascola, Gary J Nabel
The development of an effective AIDS vaccine has been challenging due to viral genetic diversity and the difficulty in generating broadly neutralizing antibodies (bnAbs). Here, we engineered trispecific antibodies (Abs) that allow a single molecule to interact with three independent HIV-1 envelope determinants: 1) the CD4 binding site, 2) the membrane proximal external region (MPER) and 3) the V1V2 glycan site. Trispecific Abs exhibited higher potency and breadth than any previously described single bnAb, showed pharmacokinetics similar to human bnAbs, and conferred complete immunity against a mixture of SHIVs in non-human primates (NHP) in contrast to single bnAbs...
September 20, 2017: Science
https://www.readbyqxmd.com/read/28931520/dna-priming-increases-frequency-of-t-cell-responses-to-a-vsv-hiv-vaccine-with-specific-enhancement-of-cd8-t-cell-responses-by-il-12-pdna
#5
Shuying S Li, Nidhi K Kochar, Marnie Elizaga, Christine M Hay, Gregory J Wilson, Kristen W Cohen, Stephen C De Rosa, Rong Xu, Ayuko Ota-Setlik, Daryl Morris, Greg Finak, Mary Allen, Hong-Van Tieu, Ian Frank, Magdalena E Sobieszczyk, Drew Hannaman, Raphael Gottardo, Peter B Gilbert, Georgia D Tomaras, Lawrence Corey, David K Clarke, Michael A Egan, John H Eldridge, M Juliana McElrath, Nicole Frahm
HVTN 087 assessed the effect of increasing doses of pIL-12 adjuvant on the immunogenicity of a HIV-1 multi-antigen (MAG) DNA vaccine delivered by electroporation and boosted with an attenuated VSV-Gag vaccine. We randomized 100 healthy adults to receive placebo, or 3mg HIV-MAG (gag/pol, env, nef/tat/vif) DNA vaccine co-administered with pIL-12 at 0μg, 250μg, 1,000μg or 1,500μg intramuscularly by electroporation at 0, 1 and 3 months followed by intramuscular inoculation with 3.4×10(7) PFU VSV-Gag vaccine at 6 months...
September 20, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28928750/the-role-of-maternal-hiv-envelope-specific-antibodies-and-mother-to-child-transmission-risk
#6
REVIEW
Ayooluwa O Douglas, David R Martinez, Sallie R Permar
Despite the wide availability of antiretroviral therapy (ART) prophylaxis during pregnancy, >150,000 infants become infected through mother-to-child transmission (MTCT) of HIV worldwide. It is likely that additional intervention strategies, such as a maternal HIV vaccine, will be required to eliminate pediatric HIV infections. A deeper understanding of the fine specificity and function of maternal HIV envelope (Env)-specific responses that provide partial protection against MTCT will be critical to inform the design of immunologic strategies to curb the pediatric HIV epidemic...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28928737/env-specific-antibodies-in-chronic-infection-versus-in-vaccination
#7
REVIEW
Martina Soldemo, Gunilla B Karlsson Hedestam
Antibodies are central in vaccine-mediated protection. For HIV-1, a pathogen that displays extreme antigenic variability, B cell responses against conserved determinants of the envelope glycoproteins (Env) are likely required to achieve broadly protective vaccine-induced responses. To understand antibodies in chronic infection, where broad serum neutralizing activity is observed in a subset of individuals, monoclonal antibodies mediating this activity have been isolated. Studies of their maturation pathways reveal that years of co-evolution between the virus and the adaptive immune response are required for such responses to arise...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28926408/serum-glycan-binding-igg-antibodies-in-hiv-1-infection-and-during-the-development-of-broadly-neutralizing-responses
#8
Cathrine Scheepers, Sudipa Chowdhury, W Shea Wright, Christopher T Campbell, Nigel J Garrett, Quarraisha Abdool Karim, Salim S Abdool Karim, Penny L Moore, Jeffrey C Gildersleeve, Lynn Morris
BACKGROUND: The HIV-1 envelope is covered with glycans that provide structural integrity and protect conserved regions from host antibody responses. However, these glycans are often the target of broadly neutralizing antibodies (bNAbs) that emerge in some HIV infected individuals. We aimed to determine whether anti-glycan IgG antibodies are a general response to HIV-1 infection or specific to individuals who develop bNAbs. METHODS: IgG binding to glycans was assessed using arrays that contained 245 unique components including N-linked carbohydrates, glycolipids and Tn-peptides...
September 18, 2017: AIDS
https://www.readbyqxmd.com/read/28925795/application-of-replication-defective-west-nile-virus-vector-to-non-flavivirus-vaccine-targets
#9
Maryann Giel-Moloney, Michael Vaine, Linong Zhang, Mark Parrington, Beata Gajewska, Thorsten U Vogel, Svetlana O Pougatcheva, Xiaochu Duan, Timothy Farrell, Irina Ustyugova, Sanjay Phogat, Harry Kleanthous, Konstantin V Pugachev
The RepliVaxvaccine platform(RV) is based on flavivirus genomes that are rationally attenuated by deletion. The self-limiting infection provided by RV has been demonstrated to be safe, highly immunogenic and efficacious for several vaccine candidates against flaviviruses. Here respiratory syncytial virus (RSV) F, influenza virus HA, and Simian Immunodeficiency virus (SIV) Env proteins were expressed in place of either prM-E or C-prM-E gene deletions of the West Nile (WN) genome. The resulting RV-RSV, -influenza and -SIV vaccine prototypes replicated efficiently in complementing helper cells expressing the WN structural proteins in trans...
September 19, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28925418/mhealth-application-areas-and-technology-combinations-a-comparison-of-literature-from-high-and-low-middle-income-countries
#10
Haitham Abaza, Michael Marschollek
BACKGROUND: With the continuous and enormous spread of mobile technologies, mHealth has evolved as a new subfield of eHealth. While eHealth is broadly focused on information and communication technologies, mHealth seeks to explore more into mobile devices and wireless communication. Since mobile phone penetration has exceeded other infrastructure in low and middle-income countries (LMICs), mHealth is seen as a promising component to provide pervasive and patient-centered care. OBJECTIVES: The aim of our research work for this paper is to examine the mHealth literature to identify application areas, target diseases, and mHealth service and technology types that are most appropriate for LMICs...
August 8, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28924616/soil-transmitted-helminth-infections-are-not-associated-with-compromised-antibody-responses-to-previously-administered-measles-and-tetanus-vaccines-among-hiv-1-infected-art-na%C3%A3-ve-kenyan-adults
#11
Helen L Storey, Benson Singa, Jackie Naulikha, Helen Horton, Barbra A Richardson, Grace John-Stewart, Judd L Walson
In many regions of sub-Saharan Africa, both HIV and helminth infections are prevalent. HIV-1 (human immunodeficiency virus type 1) and helminth infections can both compromise immune responses in humans. To determine whether the presence of helminth infection or the treatment of helminth infection alters unstimulated vaccine responses among HIV-1 infected individuals, we conducted two nested serologic studies. Blood samples were collected for HIV disease monitoring and vaccine-specific serologic assays, while stool was evaluated by direct microscopy methods...
February 2017: Parasite Epidemiology and Control
https://www.readbyqxmd.com/read/28918477/in-vitro-inhibition-of-hiv-1-replication-in-autologous-cd4-t-cells-indicates-viral-containment-by-multifactorial-mechanisms
#12
Ting Tu, Jianbo Zhan, Danlei Mou, Wei Li, Bin Su, Tong Zhang, Tao Li, Ning Li, Hao Wu, Cong Jin, Huabiao Chen
HIV-1-specific cytotoxic T lymphocytes (CTLs) and neutralizing antibodies (NAbs) are present during chronic infection, but the relative contributions of these effector mechanisms to viral containment remain unclear. Here, using an in vitro model involving autologous CD4(+) T cells, primary HIV-1 isolates, HIV-1-specific CTLs, and neutralizing monoclonal antibodies, we show that b12, a potent and broadly neutralizing monoclonal antibody to HIV-1, was able to block viral infection when preincubated with virus prior to infection, but was much less effective than CTLs at limiting virus replication when added to infected cell cultures...
September 15, 2017: Virologica Sinica
https://www.readbyqxmd.com/read/28917624/small-heat-shock-protein-27-an-effective-adjuvant-for-enhancement-of-hiv-1-nef-antigen-specific-immunity
#13
Alireza Milani, Azam Bolhassani, Sepideh Shahbazi, Fatemeh Motevalli, Seyed Mehdi Sadat, Sepehr Soleymani
Novel vaccine modalities have been designed to improve the efficiency of vaccines against HIV infections. In this way, the HIV-1 Nef protein has been known as an attractive antigenic candidate in therapeutic vaccine development. Moreover, the endogenous adjuvants such as heat shock proteins (HSPs) and high mobility group box 1 protein (HMGB1) have been suggested effectively to induce antigen-specific humoral and cellular immune responses. In this study, different Nef DNA and protein constructs were produced in eukaryotic and prokaryotic expression systems, and their immunostimulatory properties were evaluated using small heat shock protein 27 (Hsp27) and the HMGB1-derived peptide (Hp91) in a mouse model...
September 13, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28915998/predictors-of-humoral-response-to-recommended-vaccines-in-hiv-infected-adults
#14
Olga Tsachouridou, Eirini Christaki, Lemonia Skoura, Adamantini Georgiou, Sideris Nanoudis, Dimitra Vasdeki, Maria-Anna Ntziovara, Georgia Kotoreni, Evropi Forozidou, Paraskevi Tsoukra, Georgios Germanidis, Symeon Metallidis
Humoral response to vaccination has been found to be inadequate in individuals infected with the human immunodeficiency virus (HIV). We retrospectively assessed antibody responses to three routinely recommended vaccines, against hepatitis B, hepatitis A and S. pneumoniae, in HIV-infected individuals. Data regarding age at HIV diagnosis, years of infection, sex, nationality, HIV mode of transmission, CD4 cell count, nadir CD4 count, plasma viral load, HIV stage, insurance status, educational level and treatment with Highly Active Antiretroviral Therapy (HAART) were collected...
October 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28915813/the-relationship-between-burden-of-childhood-disease-and-foreign-aid-for-child-health
#15
J Clay Bavinger, Paul Wise, Eran Bendavid
BACKGROUND: We sought to examine the relationship between child specific health aid (CHA) and burden of disease. Based on existing evidence, we hypothesized that foreign aid for child health would not be proportional to burden of disease. METHODS: In order to examine CHA and burden of disease, we obtained estimates of these parameters from established sources. Estimates of disability adjusted life years (DALYs) in children (0-5 years) were obtained from the World Health Organization for 2000 and 2012...
September 15, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28911033/formulation-of-chitosan-with-the-polyepitope-hiv-1-protein-candidate-vaccine-efficiently-boosts-cellular-immune-responses-in-mice
#16
Ehsan Ollah Jazaeri, Atiyeh Mahdavi, Asghar Abdoli
Human immunodeficiency virus-1 (HIV-1) continues to be a major global public health issue and priority. Despite the variety of antiretroviral therapies, it seems that an effective vaccine against HIV-1 is still very necessary. An ideal HIV-1 vaccine should be able to elicit both humoral and cellular immunities. In this respect, polyepitope vaccines, incorporated from several conserved regions of HIV-1 proteins, have received much attention recently. Herein, the immunogenicity of the HIV-1 polyepitope protein-based candidate vaccines was evaluated in BALB/c mice...
November 30, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28910924/-a-survey-of-hiv-hbv-and-hcv-infections-in-children-aged-1-13-years-in-yi-ethnic-area-sichuan-province
#17
Y Yang, Y B Zhou, W T Cheng, X Pan, X X Song, Q W Jiang
Objective: To investigate the prevalence of HIV, HBV and HCV infections in children aged 1-13 years in Yi ethnic area in Sichuan province. Methods: A cross-sectional study was conducted in the form of field survey in four townships selected from Yi ethnic area of Sichuan during 2014-2015. Participants were children aged 1-13 years by sample size of 900 and were screened for HIV antibody, HBV surface antigen and HCV antibody, and laboratory comfirmation was conducted. The area, age, gender and ethnic group specific infection rates were compared by using Fisher's exact test, and multiple comparisons were corrected by using Bonferroni correction...
September 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28910359/prevalence-and-determinants-of-oral-infection-by-human-papillomavirus-in-hiv-infected-and-uninfected-men-who-have-sex-with-men
#18
Francesca Rollo, Alessandra Latini, Barbara Pichi, Manuela Colafigli, Maria Benevolo, Ilenia Sinopoli, Isabella Sperduti, Valentina Laquintana, Giulia Fabbri, Mirko Frasca, Antonio Cristaudo, Massimo Giuliani, Maria Gabriella Donà
BACKGROUND: Oral Human Papillomavirus (HPV) infection is rare in the general population but common in high-risk individuals. Recent data indicate that oral HPV is associated with the development of head and neck carcinomas. HPV16 infection, in particular, increases the risk of oropharyngeal cancer. METHODS: We evaluated oral HPV prevalence and determinants of infection in cancer-free HIV-infected and uninfected men who have sex with men (MSM) recruited among attendees of an STI/HIV centre...
2017: PloS One
https://www.readbyqxmd.com/read/28906006/prevalence-of-anal-oral-penile-and-urethral-human-papillomavirus-in-hiv-infected-and-hiv-uninfected-men-who-have-sex-with-men
#19
Claudio Ucciferri, Manuela Tamburro, Katia Falasca, Michela Lucia Sammarco, Giancarlo Ripabelli, Jacopo Vecchiet
Aims of the study were to evaluate Human Papillomavirus (HPV) and type-specific prevalence in four anatomical sites in HIV infected men who have sex with men (MSM) compared with HIV uninfected MSM. Participants were recruited among the attendees of Infectious Diseases Clinics in Central Italy. A trained medical practitioner collected by interview sociodemographic data and information on medical history, sexual behavior and drug use. Swabs from anal canal, oral cavity, urethral mucosa and coronal sulcus were tested for HPV DNA and genotyping...
September 14, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28904197/differential-inhibitory-receptor-expression-on-t-cells-delineates-functional-capacities-in-chronic-viral-infection
#20
Jeffrey E Teigler, Gennadiy Zelinskyy, Michael A Eller, Diane L Bolton, Mary Marovich, Alexander D Gordon, Aljawharah Alrubayyi, Galit Alter, Merlin L Robb, Jeffrey N Martin, Steven G Deeks, Nelson L Michael, Ulf Dittmer, Hendrik Streeck
Inhibitory receptors have been extensively described for their importance in regulating immune responses in chronic infections and cancers. Blocking the function of inhibitory receptors such as PD-1, CTLA-4, 2B4, Tim-3, and LAG-3 have shown promise for augmenting CD8 T cell activity and boosting pathogen-specific immunity. However, the prevalence of inhibitory receptors on CD4 T cells and their relative influence on CD4 T cell functionality in chronic HIV infection remains poorly described. We therefore determined and compared inhibitory receptor expression patterns of 2B4, CTLA-4, LAG-3, PD-1, and Tim-3 on virus-specific CD4 and CD8 T cells in relation to their functional T cell profile...
September 13, 2017: Journal of Virology
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