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Vaccination in HIV

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https://www.readbyqxmd.com/read/28533053/exploring-evidence-for-behavioral-risk-compensation-among-participants-in-an-hiv-vaccine-clinical-trial
#1
Julia E Painter, Ralph J DiClemente, Lauren Jimenez, Theron Stuart, Jessica M Sales, Mark J Mulligan
BACKGROUND: HIV vaccine trial participants may engage in behavioral risk compensation due to a false sense of protection. We conducted an ancillary study of an HIV Vaccine Trials Network (HVTN) vaccine efficacy trial to explore risk compensation among trial participants compared to persons who were willing to participate but ineligible based on previous exposure to the Ad5 virus (Ad5+) across three timepoints. METHODS: Participants were drawn from the Atlanta, GA site of the HVTN 505 vaccine trial...
May 19, 2017: Vaccine
https://www.readbyqxmd.com/read/28530684/tackling-hiv-and-aids-contributions-by-non-human-primate-models
#2
Koen K A Van Rompay
During the past three decades, non-human primate (NHP) models have gained an increasing importance in HIV basic and translational research. In contrast to natural host models, infection of macaques with virulent simian or simian-human immunodeficiency viruses (SIV, SHIV) results in a disease that closely resembles HIV infection and AIDS. Although there is no perfect animal model, and each of the available models has its benefits and limitations, carefully designed NHP studies with selection of experimental variables have unraveled important questions of basic pathogenesis and have provided the tools to explore and screen intervention strategies...
May 22, 2017: Lab Animal
https://www.readbyqxmd.com/read/28529718/recent-advances-in-understanding-hiv-evolution
#3
REVIEW
Sophie M Andrews, Sarah Rowland-Jones
The human immunodeficiency virus (HIV) evolves rapidly owing to the combined activity of error-prone reverse transcriptase, recombination, and short generation times, leading to extensive viral diversity both within and between hosts. This diversity is a major contributing factor in the failure of the immune system to eradicate the virus and has important implications for the development of suitable drugs and vaccines to combat infection. This review will discuss the recent technological advances that have shed light on HIV evolution and will summarise emerging concepts in this field...
2017: F1000Research
https://www.readbyqxmd.com/read/28526680/decrease-in-numbers-of-naive-and-resting-b-cells-in-hiv-infected-kenyan-adults-leads-to-a-proportional-increase-in-total-and-plasmodium-falciparum-specific-atypical-memory-b-cells
#4
Anne E Frosch, Oludare A Odumade, Justin J Taylor, Kathleen Ireland, George Ayodo, Bartholomew Ondigo, David L Narum, John Vulule, Chandy C John
Human immunodeficiency virus type 1 (HIV-1) infection is associated with B cell activation and exhaustion, and hypergammaglobulinemia. How these changes influence B cell responses to coinfections such as malaria is poorly understood. To address this, we compared B cell phenotypes and Abs specific for the Plasmodium falciparum vaccine candidate apical membrane Ag-1 (AMA1) in HIV-infected and uninfected adults living in Kenya. Surprisingly, HIV-1 infection was not associated with a difference in serum AMA1-specific Ab levels...
May 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28526330/going-social-success-in-online-recruitment-of-men-who-have-sex-with-men-for-prevention-hiv-vaccine-research
#5
Lindsey Buckingham, Julie Becher, Chelsea D Voytek, Danielle Fiore, Debora Dunbar, Annet Davis-Vogel, David S Metzger, Ian Frank
OBJECTIVE: To compare the use of four different social media sites to recruit men who have sex with men (MSM) and transgender women to a phase 2b HIV prevention vaccine trial, HVTN 505. DESIGN: Retrospective, observational study. METHODS: The University of Pennsylvania HIV Vaccine Trials Unit (Penn HVTU) employed street outreach and online recruitment methods to recruit participants for HVTN 505 using a combination of national recruitment images/messages with Philadelphia-specific language and imagery...
May 16, 2017: Vaccine
https://www.readbyqxmd.com/read/28521748/contextualizing-willingness-to-participate-recommendations-for-engagement-recruitment-enrolment-of-kenyan-msm-in-future-hiv-prevention-trials
#6
Monika Doshi, Lisa Avery, Ronnie P Kaddu, Mary Gichuhi, Gloria Gakii, Elsabé du Plessis, Sumit Dutta, Shamshad Khan, Joshua Kimani, Robert R Lorway
BACKGROUND: The HIV epidemic among men who have sex with men (MSM) continues to expand globally. The addition of an efficacious, prophylactic vaccine to combination prevention offers immense hope, particularly in low- and middle- income countries which bear the greatest global impact. However, in these settings, there is a paucity of vaccine preparedness studies that specifically pertain to MSM. Our study is the first vaccine preparedness study among MSM and female sex workers (FSWs) in Kenya...
May 18, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28516052/whole-body-mri-of-the-non-human-primate-using-a-clinical-3t-scanner-initial-experiences
#7
Chun-Xia Li, Xiaodong Zhang
With the advent of parallel imaging MRI techniques, whole-body MRI is being increasingly used in clinical diagnosis. However, its application in preclinical research using large animals remains very limited. In the present study, the whole-body MRI techniques for adult macaque monkeys were explored using a conventional clinic 3T scanner. The T1, T2 anatomical images, and MR angiography of adult macaque whole bodies were illustrated. The preliminary results suggest whole-body MRI can be a robust tool to examine multiple organs of non-human primate (NHP) models from head to toe non-invasively and simultaneously using a conventional clinical setting...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28514687/particulate-array-of-well-ordered-hiv-clade-c-env-trimers-elicits-neutralizing-antibodies-that-display-a-unique-v2-cap-approach
#8
Paola Martinez-Murillo, Karen Tran, Javier Guenaga, Gustaf Lindgren, Monika Àdori, Yu Feng, Ganesh E Phad, Néstor Vázquez Bernat, Shridhar Bale, Jidnyasa Ingale, Viktoriya Dubrovskaya, Sijy O'Dell, Lotta Pramanik, Mats Spångberg, Martin Corcoran, Karin Loré, John R Mascola, Richard T Wyatt, Gunilla B Karlsson Hedestam
The development of soluble envelope glycoprotein (Env) mimetics displaying ordered trimeric symmetry has ushered in a new era in HIV-1 vaccination. The recently reported native, flexibly linked (NFL) design allows the generation of native-like trimers from clinical isolates at high yields and homogeneity. As the majority of infections world-wide are of the clade C subtype, we examined responses in non-human primates to well-ordered subtype C 16055 trimers administered in soluble or high-density liposomal formats...
May 16, 2017: Immunity
https://www.readbyqxmd.com/read/28514686/glycine-substitution-at-helix-to-coil-transitions-facilitates-the-structural-determination-of-a-stabilized-subtype-c-hiv-envelope-glycoprotein
#9
Javier Guenaga, Fernando Garces, Natalia de Val, Robyn L Stanfield, Viktoriya Dubrovskaya, Brett Higgins, Barbara Carrette, Andrew B Ward, Ian A Wilson, Richard T Wyatt
Advances in HIV-1 envelope glycoprotein (Env) design generate native-like trimers and high-resolution clade A, B, and G structures and elicit neutralizing antibodies. However, a high-resolution clade C structure is critical, as this subtype accounts for the majority of HIV infections worldwide, but well-ordered clade C Env trimers are more challenging to produce due to their instability. Based on targeted glycine substitutions in the Env fusion machinery, we defined a general approach that disfavors helical transitions leading to post-fusion conformations, thereby favoring the pre-fusion state...
May 16, 2017: Immunity
https://www.readbyqxmd.com/read/28514679/size-doesn-t-matter-shorter-antibody-loops-can-infiltrate-hiv-s-env-apex-defenses
#10
Jinal N Bhiman, Penny L Moore
An HIV vaccine that elicits broadly neutralizing antibodies, which often have unusual structural features, has not yet been developed. In Immunity this month, Cale et al., 2017 describe how a new mode of binding allows a conventional antibody to infiltrate HIV's armor.
May 16, 2017: Immunity
https://www.readbyqxmd.com/read/28513983/book-review-the-foundations-of-immunology-and-their-pertinence-to-medicine
#11
REVIEW
A Corthay
We are in the era cursed with overspecialization. Charles Darwin's foundational Origin of Species, published in 1859 was accessible to the broadly educated individual. Starting with this statement, Peter Bretscher in his new book aims at explaining foundational concepts of immunology to a broad public. His standpoint is that foundational ideas usually can be simply expressed. This book describes first how foundational concepts of immunology have evolved over the last two and a half centuries. The importance of self-nonself discrimination by the immune system is acknowledged and models for immunological tolerance are compared...
May 17, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28511091/molecular-cloning-and-characterization-of-dngr-1-in-rhesus-macaques
#12
Wen-Rong Yao, Lei Yu, Dong Li, Gui-Bo Yang
DC, NK lectin group receptor-1 (DNGR-1), also known as C-type lectin domain family 9 member A (CLEC9A), is a promising target for immunological therapeutics and vaccination against tumors and viruses. However, little is known about its property in rhesus macaques. In this study, we cloned rhesus macaque DNGR-1 cDNA, and found that its coding region could encode a 241-amino acid polypeptide with 91.7% sequence identity and similar antigenicity to that of humans. Both free and cell surface rhesus macaque DNGR-1 expressed in vitro could bind to apoptotic/dead cells induced by serum deprivation or freeze-thaw, and to pyroptotic cells stimulated with PMA and LPS...
May 13, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28505602/unusual-antigen-presentation-offers-new-insight-into-hiv-vaccine-design
#13
REVIEW
Andrew J McMichael, Louis J Picker
Recent findings with a rhesus monkey cytomegalovirus based simian immunodeficiency virus vaccine have identified strong CD8+ T cell responses that are restricted by MHC-E. Also mycobacteria specific CD8+ T cells, that are MHC-E restricted, have been identified. MHC-E therefore can present a wide range of epitope peptides to CD8+ T cells, alongside its well defined role in presenting a conserved MHC-class I signal peptide to the NKG2A/C-CD94 receptor on natural killer cells. Here we explore the antigen processing pathways involved in these atypical T cell responses...
May 12, 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/28505234/increased-risk-for-meningococcal-disease-among-men-who-have-sex-with-men-in-the-united-states-2012-2015
#14
Temitope A Folaranmi, Cecilia B Kretz, Hajime Kamiya, Jessica R MacNeil, Melissa J Whaley, Amy Blain, Mike Antwi, Marie Dorsinville, Massimo Pacilli, Shamika Smith, Rachel Civen, Van Ngo, Kathleen Winter, Kathleen Harriman, Xin Wang, Virginia B Bowen, Manisha Patel, Stacey Martin, Lara Misegades, Sarah A Meyer
Background: Several clusters of serogroup C meningococcal disease among men who have sex with men (MSM) have been reported in the United States in recent years. The epidemiology and risk of meningococcal disease among MSM is not well-described. Methods: All meningococcal disease cases among men aged 18-64 years reported to the National Notifiable Disease Surveillance System between January 2012 and June 2015 were reviewed. Characteristics of meningococcal disease cases among MSM and men not known to be MSM (non-MSM) were described...
May 13, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28505117/hiv-enhancing-and-hiv-inhibiting-properties-of-cationic-peptides-and-proteins
#15
REVIEW
Alexander M Cole, Amy L Cole
Cationic antimicrobial peptides and proteins have historically been ascribed roles in innate immunity that infer killing of microbial and viral pathogens and protection of the host. In the context of sexually transmitted HIV-1, we take an unconventional approach that questions this paradigm. It is becoming increasingly apparent that many of the cationic polypeptides present in the human genital or anorectal mucosa, or human semen, are capable of enhancing HIV-1 infection, often in addition to other reported roles as viral inhibitors...
May 15, 2017: Viruses
https://www.readbyqxmd.com/read/28502791/single-strand-consensus-sequencing-reveals-that-hiv-type-but-not-subtype-significantly-impacts-viral-mutation-frequencies-and-spectra
#16
Jonathan M O Rawson, Daryl M Gohl, Sean R Landman, Megan E Roth, Morgan E Meissner, Tara S Peterson, James S Hodges, Kenneth B Beckman, Louis M Mansky
A long-standing question of human immunodeficiency virus (HIV) genetic variation and evolution has been whether differences exist in mutation rate and/or mutation spectra among HIV types (i.e., HIV-1 versus HIV-2) as well as among HIV groups (i.e., HIV-1 groups M-P and HIV-2 groups A-H) and HIV-1 Group M subtypes (i.e., subtypes A-D, F-H, and J-K). To address this, a new single-strand consensus sequencing assay was developed for the determination of HIV mutation frequencies and spectra using the Illumina sequencing platform...
May 11, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28500726/mutations-associated-with-drug-resistance-and-prevalence-of-vaccine-escape-mutations-in-patients-with-chronic-hepatitis-b-infection
#17
Maria Isabel Magalhães A Dos Santos, Sidelcina Pacheco Rugiere, Andreas Stocker, Maria Isabel Schinoni, Raymundo Paraná, Mitermayer G Reis, Luciano K Silva
BACKGROUND: The Brazilian public health system (SUS) has provided antiviral drugs for chronic hepatitis B treatment for over 10 years, but a system for monitoring for drug-related resistance mutations is not available. OBJECTIVES: Determine the presence of HBV mutations associated with resistance to nucleos(t)ide analogs among 81 patients with chronic HBV infection in Salvador - BA - Brazil. STUDY DESIGN: HBV-DNA was PCR amplified with primers deduced from the rt domain at the HBV P gene, the sequence extended 1032 bp (from amino acid 1 to 344 - rt domain)...
May 13, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28498853/safety-and-immunogenicity-of-an-inactivated-whole-cell-tuberculosis-vaccine-booster-in-adults-primed-with-bcg-a-randomized-controlled-trial-of-dar-901
#18
C Fordham von Reyn, Timothy Lahey, Robert D Arbeit, Bernard Landry, Leway Kailani, Lisa V Adams, Brenda C Haynes, Todd Mackenzie, Wendy Wieland-Alter, Ruth I Connor, Sue Tvaroha, David A Hokey, Ann M Ginsberg, Richard Waddell
BACKGROUND: Development of a tuberculosis vaccine to boost BCG is a major international health priority. SRL172, an inactivated whole cell booster derived from a non-tuberculous mycobacterium, is the only new vaccine against tuberculosis to have demonstrated efficacy in a Phase 3 trial. In the present study we sought to determine if a three-dose series of DAR-901 manufactured from the SRL172 master cell bank by a new, scalable method was safe and immunogenic. METHODS: We performed a single site, randomized, double-blind, controlled, Phase 1 dose escalation trial of DAR-901 at Dartmouth-Hitchcock Medical Center in the United States...
2017: PloS One
https://www.readbyqxmd.com/read/28493891/antibody-to-hsv-gd-peptide-induced-by-vaccination-does-not-protect-against-hsv-2-infection-in-hsv-2-seronegative-women
#19
Peter B Gilbert, Jean-Louis Excler, Georgia D Tomaras, Lindsay N Carpp, Barton F Haynes, Hua-Xin Liao, David C Montefiori, Supachai Rerks-Ngarm, Punnee Pitisuttithum, Sorachai Nitayaphan, Jaranit Kaewkungwal, Gustavo H Kijak, Sodsai Tovanabutra, Donald P Francis, Carter Lee, Faruk Sinangil, Phillip W Berman, Nakorn Premsri, Prayura Kunasol, Robert J O'Connell, Nelson L Michael, Merlin L Robb, Rhoda Morrow, Lawrence Corey, Jerome H Kim
BACKGROUND: In the HIV-1 vaccine trial RV144, ALVAC-HIV prime with an AIDSVAX® B/E boost reduced HIV-1 acquisition by 31% at 42 months post first vaccination. The bivalent AIDSVAX® B/E vaccine contains two gp120 envelope glycoproteins, one from the subtype B HIV-1 MN isolate and one from the subtype CRF01_AE A244 isolate. Each envelope glycoprotein harbors a highly conserved 27-amino acid HSV-1 glycoprotein D (gD) tag sequence that shares 93% sequence identity with the HSV-2 gD sequence...
2017: PloS One
https://www.readbyqxmd.com/read/28493367/granulocyte-macrophage-colony-stimulating-factor-a-potent-adjuvant-for-polarization-to-th-17-pattern-an-experience-on-hiv-1-vaccine-model
#20
Mehdi Mahdavi, Amir Hossein Tajik, Massoumeh Ebtekar, Roghieh Rahimi, Mohammad Mehdi Adibzadeh, Hamid Reza Moozarmpour, Mohammad Sadegh Beikverdi, Soophie Olfat, Zuhair Mohammad Hassan, Mohammad Choopani, Morteza Kameli, Christine Hartoonian
Cytokines are mediators for polarization of immune response in vaccines. Studies show that co-immunization of DNA vaccines with granulocyte-macrophage colony-stimulating factor (GM-CSF) can increase immune responses. Here, experimental mice were immunized with HIV-1tat/pol/gag/env DNA vaccine with GM-CSF and boosted with recombinant vaccine. Lymphocyte proliferation with Brdu and CTL activity, IL-4, IFN-γ, IL-17 cytokines, total antibody, and IgG1 and IgG2a isotypes were assessed with ELISA. Results show that GM-CSF as adjuvant in DNA immunization significantly increased lymphocyte proliferation and IFN-γ cytokines, but CTL response was tiny increased...
May 11, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
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