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Influenza challenge studies

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https://www.readbyqxmd.com/read/28079473/protective-immunity-against-influenza-in-hla-a2-transgenic-mice-by-modified-vaccinia-virus-ankara-vectored-vaccines-containing-internal-influenza-proteins
#1
Giuseppina Di Mario, Ester Sciaraffia, Marzia Facchini, Francesco Gubinelli, Elisa Soprana, Maddalena Panigada, Valentina Bernasconi, Bruno Garulli, Antonio Siccardi, Isabella Donatelli, Maria R Castrucci
BACKGROUND: The emergence of novel strains of influenza A viruses with hemagglutinins (HAs) that are antigenically distinct from those circulating in humans, and thus have pandemic potential, pose concerns and call for the development of more broadly protective influenza vaccines. In the present study, modified vaccinia virus Ankara (MVA) encoding internal influenza antigens were evaluated for their immunogenicity and ability to protect HLA-A2.1 transgenic (AAD) mice from infection with influenza viruses...
January 12, 2017: Pathogens and Global Health
https://www.readbyqxmd.com/read/28067290/chimeric-virus-like-particles-containing-influenza-ha-antigen-and-gpi-ccl28-induce-long-lasting-mucosal-immunity-against-h3n2-viruses
#2
Teena Mohan, Zachary Berman, Yuan Luo, Chao Wang, Shelly Wang, Richard W Compans, Bao-Zhong Wang
Influenza virus is a significant cause of morbidity and mortality, with worldwide seasonal epidemics. The duration and quality of humoral immunity and generation of immunological memory to vaccines is critical for protective immunity. In the current study, we examined the long-lasting protective efficacy of chimeric VLPs (cVLPs) containing influenza HA and GPI-anchored CCL28 as antigen and mucosal adjuvant, respectively, when immunized intranasally in mice. We report that the cVLPs induced significantly higher and sustainable levels of virus-specific antibody responses, especially IgA levels and hemagglutination inhibition (HAI) titers, more than 8-month post-vaccination compared to influenza VLPs without CCL28 or influenza VLPs physically mixed with sCCL28 (soluble) in mice...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28065266/production-of-recombinant-rhomboid-proteases
#3
E Arutyunova, R Panigrahi, K Strisovsky, M J Lemieux
Rhomboid proteases are intramembrane enzymes that hydrolyze peptide bonds of transmembrane proteins in the lipid bilayer. They play a variety of roles in key biological events and are linked to several disease states. Over the last decade a great deal of structural and functional knowledge has been generated on this fascinating class of proteases. Both structural and kinetic analyses require milligram amounts of protein, which may be challenging for membrane proteins such as rhomboids. Here, we present a detailed protocol for optimization of expression and purification of three rhomboid proteases from Escherichia coli (ecGlpG), Haemophilus influenzae (hiGlpG), and Providencia stuartii (AarA)...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28057521/biodegradable-nanoparticle-delivery-of-inactivated-swine-influenza-virus-vaccine-provides-heterologous-cell-mediated-immune-response-in-pigs
#4
Santosh Dhakal, Jagadish Hiremath, Kathryn Bondra, Yashavanth S Lakshmanappa, Duan-Liang Shyu, Kang Ouyang, Kyung-Il Kang, Basavaraj Binjawadagi, Jonathan Goodman, Kairat Tabynov, Steven Krakowka, Balaji Narasimhan, Chang-Won Lee, Gourapura J Renukaradhya
Swine influenza virus (SwIV) is one of the important zoonotic pathogens. Current flu vaccines have failed to provide cross-protection against evolving viruses in the field. Poly lactic-co-glycolic acid (PLGA) is a biodegradable FDA approved polymer and widely used in drug and vaccine delivery. In this study, inactivated SwIV H1N2 antigens (KAg) encapsulated in PLGA nanoparticles (PLGA-KAg) were prepared, which were spherical in shape with 200 to 300nm diameter, and induced maturation of antigen presenting cells in vitro...
January 2, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28029540/use-of-a-booster-dose-of-capsular-group-c-meningococcal-glycoconjugate-vaccine-to-demonstrate-immunologic-memory-in-children-primed-with-one-or-two-vaccine-doses-in-infancy
#5
David Pace, Ameneh Khatami, Simon Attard-Montalto, Merryn Voysey, Adam Finn, Saul N Faust, Paul T Heath, Ray Borrow, Matthew D Snape, Andrew J Pollard
BACKGROUND: Use of a polysaccharide vaccine challenge to demonstrate immunologic memory after priming with capsular group C meningococcal conjugate vaccines (MenCC) risks induction of immunologic hyporesponsiveness. For this reason, MenCC vaccines are now used as probes of immunologic memory, however, no studies have demonstrated their ability to distinguish primed from unprimed children. METHODS: This study was part of a randomised controlled trial investigating the immunogenicity of a booster dose of the combined Haemophilus influenzae type b and MenC-tetanus toxoid vaccine (Hib-MenC-TT) in infants receiving reduced dose MenCC vaccine priming schedules (one MenC-CRM/MenC-TT or two MenC-CRM vaccine doses) compared with an unprimed group...
October 28, 2016: Vaccine
https://www.readbyqxmd.com/read/28027847/improvement-influenza-ha2-dna-vaccine-cellular-and-humoral-immune-responses-with-mx-bio-adjuvant
#6
Sina Soleimani, Shahla Shahsavandi, Omid Maddadgar
Immunization with DNA vaccines as a novel alternative to conventional vaccination strategy requires adjuvant for improving vaccine efficacy. The conserved immunogenic HA2 subunit, which harbors neutralizing epitopes is a promising vaccine candidate against influenza viruses. In this study, for the first time we explore the idea of using host interferon inducible Mx protein to increase the immunogenicity of HA2 H9N2 influenza DNA vaccine. The potency and safety of the Mx adjuvanted-HA2 vaccine was evaluated in BALB/c mice by different prime-boost strategies...
December 24, 2016: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28005959/an-intranasal-proteosome-adjuvanted-trivalent-influenza-vaccine-is-safe-immunogenic-efficacious-in-the-human-viral-influenza-challenge-model-serum-igg-mucosal-iga-are-important-correlates-of-protection-against-illness-associated-with-infection
#7
Rob Lambkin-Williams, Colin Gelder, Richard Broughton, Corey P Mallett, Anthony S Gilbert, Alex Mann, David He, John S Oxford, David Burt
INTRODUCTION: A Proteosome-adjuvanted trivalent inactivated influenza vaccine (P-TIV) administered intra-nasally was shown to be safe, well tolerated and immunogenic in both systemic and mucosal compartments, and effective at preventing illness associated with evidence of influenza infection. METHODS: In two separate studies using the human viral challenge model, subjects were selected to be immunologically naive to A/Panama/2007/1999 (H3N2) virus and then dosed via nasal spray with one of three regimens of P-TIV or placebo...
2016: PloS One
https://www.readbyqxmd.com/read/28004787/cross-protective-efficacy-of-dendritic-cells-targeting-conserved-influenza-virus-antigen-expressed-by-lactobacillus-plantarum
#8
Wen-Tao Yang, Shao-Hua Shi, Gui-Lian Yang, Yan-Long Jiang, Liang Zhao, Yu Li, Chun-Feng Wang
Avian influenza virus (AIV) can infect birds and mammals, including humans, and are thus a serious threat to public health. Vaccination is vital for controlling AIV circulation. In this study, we generated a recombinant lactobacillus expressing the NP-M1-DCpep of H9N2 avian influenza virus and evaluated the activation effect of NC8-pSIP409-NP-M1-DCpep on dendritic cells (DCs) in a mouse model. The specific mucosal antibody responses and B and T cell responses in lymphoid tissues were also characterized. Importantly, we confirmed that specific CD8 T cells presented in vitro and antigen-specific cytotoxicity (activated the expression of CD107a) and in vivo antigen-specific cytotoxicity after vaccination...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27989811/re-emergence-of-amantadine-resistant-variants-among-highly-pathogenic-avian-influenza-h5n1-viruses-in-egypt
#9
Rabeh El-Shesheny, Ola Bagato, Ahmed Kandeil, Ahmed Mostafa, Sara H Mahmoud, Hamdi M Hassanneen, Richard J Webby, Mohamed A Ali, Kayali Ghazi
Highly pathogenic avian influenza (HPAI) H5N1 virus continues to undergo substantial evolution. Emergence of antiviral resistance among H5N1 avian influenza viruses is a major challenge in the control of pandemic influenza. Numerous studies have focused on the genetic and evolution dynamic of the hemagglutinin and neuraminidase genes; however, studies on the susceptibility of HPAI H5N1 viruses to amantadine and genetic diversity of the matrix (M) gene are limited. Accordingly, we studied the amantadine susceptibility of the HPAI H5N1 viruses isolated in Egypt during 2006-2015 based on genotypic and phenotypic characteristics...
October 29, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27989237/modernising-epidemic-science-enabling-patient-centred-research-during-epidemics
#10
EDITORIAL
Amanda M Rojek, Peter W Horby
BACKGROUND: Emerging and epidemic infectious disease outbreaks are a significant public health problem and global health security threat. As an outbreak begins, epidemiological investigations and traditional public health responses are generally mounted very quickly. However, patient-centred research is usually not prioritised when planning and enacting the response. Instead, the clinical research response occurs subsequent to and separate from the public health response, and is inadequate for evidence-based decision-making at the bedside or in the offices of public health policymakers...
December 19, 2016: BMC Medicine
https://www.readbyqxmd.com/read/27981236/a-phylogeny-based-global-nomenclature-system-and-automated-annotation-tool-for-h1-hemagglutinin-genes-from-swine-influenza-a-viruses
#11
Tavis K Anderson, Catherine A Macken, Nicola S Lewis, Richard H Scheuermann, Kristien Van Reeth, Ian H Brown, Sabrina L Swenson, Gaëlle Simon, Takehiko Saito, Yohannes Berhane, Janice Ciacci-Zanella, Ariel Pereda, C Todd Davis, Ruben O Donis, Richard J Webby, Amy L Vincent
The H1 subtype of influenza A viruses (IAVs) has been circulating in swine since the 1918 human influenza pandemic. Over time, and aided by further introductions from nonswine hosts, swine H1 viruses have diversified into three genetic lineages. Due to limited global data, these H1 lineages were named based on colloquial context, leading to a proliferation of inconsistent regional naming conventions. In this study, we propose rigorous phylogenetic criteria to establish a globally consistent nomenclature of swine H1 virus hemagglutinin (HA) evolution...
November 2016: MSphere
https://www.readbyqxmd.com/read/27966084/effects-of-dietary-inclusion-level-of-a-mixture-of-probiotic-cultures-and-enzymes-on-broiler-chickens-immunity-response
#12
Alireza Seidavi, Mohammad Dadashbeiki, Mohammad-Hossein Alimohammadi-Saraei, René van den Hoven, Rita Payan-Carreira, Vito Laudadio, Vincenzo Tufarelli
The current study was conducted to analyse the effect of a mixture of probiotic cultures and enzymes (Probio Enzyme, XVET GmbH, Germany) on the immune response and weight of central lymphoid organs and liver in broilers. A total of 270 male chickens were randomly divided into nine groups, with three replicates of 10 birds each. Treatment groups were fed for either 22 or 42 days with different levels of Probio Enzyme 250, 500, 750 and 1000 g/ton, whereas the control group fed a basal diet without Probio Enzyme...
December 13, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27941707/biological-characteristics-of-h9n2-avian-influenza-viruses-from-healthy-chickens-in-shanghai-china
#13
Qingfeng Shi, Qianli Wang, Liwen Ju, Haiyan Xiong, Yue Chen, Lufang Jiang, Qingwu Jiang
BACKGROUND H9N2 avian influenza viruses that circulate in domestic poultry in eastern China pose challenges to human health. However, few studies have compared the biological characteristics of H9N2 viruses isolated from healthy chickens in Shanghai. MATERIAL AND METHODS Three H9N2 viruses - CK/SH/Y1/07, CK/SH/Y1/02, and CK/SH/23/13 - isolated from healthy chickens in Shanghai between 2002 and 2013, were selected and their biological characteristics were determined. RESULTS All 3 H9N2 viruses showed a preference for both the avian- and human-like receptors, and they replicated well in MDCK and A549 cells...
December 10, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27938677/first-evaluation-of-an-influenza-viral-vector-based-brucella-abortus-vaccine-in-sheep-and-goats-assessment-of-safety-immunogenicity-and-protective-efficacy-against-brucella-melitensis-infection
#14
Kaissar Tabynov, Bolat Yespembetov, Nurali Matikhan, Sholpan Ryskeldinova, Nadezhda Zinina, Zhailaubay Kydyrbayev, Nurika Assanzhanova, Kairat Tabynov, Gourapura J Renukaradhya, Gulnara Mukhitdinova, Abylai Sansyzbay
Previously we developed and evaluated a candidate influenza viral vector based Brucella abortus vaccine (Flu-BA) administered with a potent adjuvant Montanide Gel01 in cattle, which was found safe and highly effective. This study was aimed to establish a proof-of-concept of the efficacy of Flu-BA vaccine formulation in sheep and goats. We vaccinated sheep and goats with Flu-BA vaccine and as a positive control vaccinated a group of animals with a commercial B. melitensis Rev.1 vaccine. Clinically, both Flu-BA and Rev...
December 25, 2016: Veterinary Microbiology
https://www.readbyqxmd.com/read/27929449/reviewing-the-history-of-pandemic-influenza-understanding-patterns-of-emergence-and-transmission
#15
REVIEW
Patrick R Saunders-Hastings, Daniel Krewski
For centuries, novel strains of influenza have emerged to produce human pandemics, causing widespread illness, death, and disruption. There have been four influenza pandemics in the past hundred years. During this time, globalization processes, alongside advances in medicine and epidemiology, have altered the way these pandemics are experienced. Drawing on international case studies, this paper provides a review of the impact of past influenza pandemics, while examining the evolution of our understanding of, and response to, these viruses...
December 6, 2016: Pathogens
https://www.readbyqxmd.com/read/27924780/activity-of-ergoferon-against-lethal-influenza-a-h3n2-virus-infection-in-mice
#16
Maria A Skarnovich, Alexandra G Emelyanova, Nataliia V Petrova, Alena A Borshcheva, Evgeniy A Gorbunov, Oleg Yu Mazurkov, Maksim O Skarnovich, Sergey A Tarasov, Larisa N Shishkina, Oleg I Epstein
BACKGROUND: The Influenza A virus accounts for serious annual viral upper respiratory tract infections. It is constantly able to modify its antigenic structure, thus evading host defence mechanisms. Moreover, currently available anti-influenza agents have a rather limited application, emphasising the further need for new effective treatments. One of them is Ergoferon, a drug, containing combined polyclonal antibodies - anti-interferon gamma, anti-CD4 receptor, and anti-histamine - in released-active form...
December 7, 2016: Antiviral Therapy
https://www.readbyqxmd.com/read/27923906/cd4-t-cell-effector-commitment-coupled-to-self-renewal-by-asymmetric-cell-divisions
#17
Simone A Nish, Kyra D Zens, Radomir Kratchmarov, Wen-Hsuan W Lin, William C Adams, Yen-Hua Chen, Bonnie Yen, Nyanza J Rothman, Avinash Bhandoola, Hai-Hui Xue, Donna L Farber, Steven L Reiner
Upon infection, an activated CD4(+) T cell produces terminally differentiated effector cells and renews itself for continued defense. In this study, we show that differentiation and self-renewal arise as opposing outcomes of sibling CD4(+) T cells. After influenza challenge, antigen-specific cells underwent several divisions in draining lymph nodes (LN; DLNs) while maintaining expression of TCF1. After four or five divisions, some cells silenced, whereas some cells maintained TCF1 expression. TCF1-silenced cells were T helper 1-like effectors and concentrated in the lungs...
January 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/27910264/vaccination-against-h9n2-avian-influenza-virus-reduces-bronchus-associated-lymphoid-tissue-formation-in-cynomolgus-macaques-after-intranasal-virus-challenge-infection
#18
Misako Nakayama, Hiroichi Ozaki, Yasushi Itoh, Kosuke Soda, Hirohito Ishigaki, Masatoshi Okamatsu, Yoshihiro Sakoda, Chun-Ho Park, Hideaki Tsuchiya, Hiroshi Kida, Kazumasa Ogasawara
H9N2 avian influenza virus causes sporadic human infection. Since humans do not possess acquired immunity specific to this virus, we examined the pathogenicity of an H9N2 virus isolated from a human and then analyzed protective effects of a vaccine in cynomolgus macaques. After intranasal challenge with A/Hong Kong/1073/1999 (H9N2) (HK1073) isolated from a human patient, viruses were isolated from nasal and tracheal swabs in unvaccinated macaques with mild fever and body weight loss. A formalin-inactivated H9N2 whole particle vaccine derived from our virus library was subcutaneously inoculated to macaques...
December 2016: Pathology International
https://www.readbyqxmd.com/read/27908830/protective-efficacy-of-fc-targeting-conserved-influenza-virus-m2e-antigen-expressed-by-lactobacillus-plantarum
#19
Wen-Tao Yang, Gui-Lian Yang, Qian Wang, Hai-Bin Huang, Yan-Long Jiang, Chun-Wei Shi, Jian-Zhong Wang, Ke-Yan Huang, Yu-Bei Jin, Chun-Feng Wang
The influenza A (H1N1) virus is a highly contagious acute respiratory disease affecting pigs and humans. This disease causes severe economic loss in many countries, and developing mucosal vaccines is an efficient strategy to control the influenza virus. The neonatal Fc receptor (FcRn) plays an important role in transferring IgG across polarized epithelial cells. In the present study, an oral vaccine was developed using Lactobacillus plantarum to deliver the internal influenza viral protein M2e fused to an IgG Fc fragment...
February 2017: Antiviral Research
https://www.readbyqxmd.com/read/27902386/establishment-of-memory-cd8-t-cells-with-live-attenuated-influenza-virus-across-different-vaccination-doses
#20
Zhongfang Wang, Lukasz Kedzierski, Simone Nuessing, Brendon Yew Loong Chua, Sergio M Quiñones-Parra, Victor C Huber, David C Jackson, Paul G Thomas, Katherine Kedzierska
FluMist has been used in children and adults for more than 10 years. As pre-existing CD8+ T cell memory pools can provide heterologous immunity against distinct influenza viruses, it is important to understand influenza-specific CD8+ T cell responses elicited by different live attenuated influenza virus (LAIV) regimens. In this study, we immunized mice intranasally with two different doses of live-attenuated PR8 virus (PR8 ts, H1N1), low and high, and then assessed protective efficacy by challenging animals with heterosubtypic X31-H3N2 virus at 6 weeks post-vaccination...
December 2016: Journal of General Virology
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