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https://www.readbyqxmd.com/read/28341670/prime-boost-immunization-eliminates-metastatic-colorectal-cancer-by-producing-high-avidity-effector-cd8-t-cells
#1
Bo Xiang, Trevor R Baybutt, Lisa Berman-Booty, Michael S Magee, Scott A Waldman, Vitali Y Alexeev, Adam E Snook
Heterologous prime-boost immunization with plasmid DNA and viral vector vaccines is an emerging approach to elicit CD8(+) T cell-mediated immunity targeting pathogens and tumor Ags that is superior to either monotherapy. Yet, the mechanisms underlying the synergy of prime-boost strategies remain incompletely defined. In this study, we examine a DNA and adenovirus (Ad5) combination regimen targeting guanylyl cyclase C (GUCY2C), a receptor expressed by intestinal mucosa and universally expressed by metastatic colorectal cancer...
March 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28341332/the-viral-innate-immune-antagonism-and-an-alternative-vaccine-design-for-prrs-virus
#2
REVIEW
Hanzhong Ke, Dongwan Yoo
Porcine reproductive and respiratory syndrome (PRRS) remains one of the most economically significant diseases in the swine industry worldwide. The current vaccines are less satisfactory to confer protections from heterologous infections and long-term persistence, and the need for better vaccines are urgent. The immunological hallmarks in PRRSV-infected pigs include the unusually poor production of type I interferons (IFNs-α/β) and the aberrant and delayed adaptive immune responses, indicating that PRRSV has the ability to suppress both innate and adaptive immune responses in the host...
March 18, 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28339499/evaluation-of-fusion-protein-cleavage-site-sequences-of-newcastle-disease-virus-in-genotype-matched-vaccines
#3
Shin-Hee Kim, Zongyan Chen, Asuka Yoshida, Anandan Paldurai, Sa Xiao, Siba K Samal
Newcastle disease virus (NDV) causes a devastating poultry disease worldwide. Frequent outbreaks of NDV in chickens vaccinated with conventional live vaccines suggest a need to develop new vaccines that are genetically matched against circulating NDV strains, such as the genotype V virulent strains currently circulating in Mexico and Central America. In this study, a reverse genetics system was developed for the virulent NDV strain Mexico/01/10 strain and used to generate highly attenuated vaccine candidates by individually modifying the cleavage site sequence of fusion (F) protein...
2017: PloS One
https://www.readbyqxmd.com/read/28334041/virus-mediated-suppression-of-host-non-self-recognition-facilitates-horizontal-transmission-of-heterologous-viruses
#4
Songsong Wu, Jiasen Cheng, Yanping Fu, Tao Chen, Daohong Jiang, Said A Ghabrial, Jiatao Xie
Non-self recognition is a common phenomenon among organisms; it often leads to innate immunity to prevent the invasion of parasites and maintain the genetic polymorphism of organisms. Fungal vegetative incompatibility is a type of non-self recognition which often induces programmed cell death (PCD) and restricts the spread of molecular parasites. It is not clearly known whether virus infection could attenuate non-self recognition among host individuals to facilitate its spread. Here, we report that a hypovirulence-associated mycoreovirus, named Sclerotinia sclerotiorum mycoreovirus 4 (SsMYRV4), could suppress host non-self recognition and facilitate horizontal transmission of heterologous viruses...
March 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28331098/recombinant-modified-vaccinia-virus-ankara-generating-ebola-virus-like-particles
#5
Marc Schweneker, Andrea S Laimbacher, Gert Zimmer, Susanne Wagner, Elisabeth M Schraner, Michael Wolferstätter, Marieken Klingenberg, Ulrike Dirmeier, Robin Steigerwald, Henning Lauterbach, Hubertus Hochrein, Paul Chaplin, Mark Suter, Jürgen Hausmann
There are currently no approved therapeutics or vaccines to treat or protect against the severe hemorrhagic fever and death caused by Ebola virus (EBOV). Ebola virus-like particles (EBOV-VLPs) consisting of the matrix protein VP40, the glycoprotein (GP) and the nucleoprotein (NP) are highly immunogenic and protective in non-human primates against Ebola virus disease (EVD). We have constructed a modified vaccinia virus Ankara-Bavarian Nordic(®) (MVA-BN(®)) recombinant co-expressing VP40 and glycoprotein (GP) of EBOV Mayinga and the nucleoprotein (NP) of Taï Forest virus (TAFV) (MVA-BN-EBOV-VLP) to launch non-infectious EBOV-VLPs as a second vaccine modality in the MVA-BN-EBOV-VLP-vaccinated organism...
March 22, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28331080/evaluation-of-the-immune-responses-to-and-cross-protective-efficacy-of-eurasian-h7-avian-influenza-viruses
#6
Hyeok-Il Kwon, Young-Il Kim, Su-Jin Park, Min-Suk Song, Eun-Ha Kim, Se Mi Kim, Young-Jae Si, In-Won Lee, Byung-Min Song, Youn-Jeong Lee, Seok Joong Yun, Wun-Jae Kim, Young Ki Choi
Due to increasing concerns of human infection by various H7 viruses, including recent H7N9 viruses, we evaluated the genetic relationships and the cross-protective efficacies of three different Eurasian H7 avian influenza viruses. Phylogenic and molecular analysis revealed that recent Eurasian H7 viruses can be separated into two different lineages with relatively high amino acid identity within groups (94.8 to 98.8%), and low amino acid identity (90.3 to 92.6 %) between the groups. In vivo immunization with representatives of each group revealed that while group-specific cross-reactivity was induced, cross-reactive HI titers were approximately fourfold lower against heterologous group viruses compared to homologous group viruses...
March 22, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28322923/microspheres-prime-rmva-boost-vaccination-enhances-humoral-and-cellular-immune-response-in-ifnar-mice-conferring-protection-against-serotypes-1-and-4-of-bluetongue-virus
#7
Alejandro Marín-López, Eva Calvo-Pinilla, Diego Barriales, Gema Lorenzo, Javier Benavente, Alejandro Brun, Jose Manuel Martínez-Costas, Javier Ortego
Bluetongue virus (BTV) is the causative agent of bluetongue disease (BT), which affects domestic and wild ruminants. At the present, 27 different serotypes have been documented. Vaccination has been demonstrated as one of the most effective methods to avoid viral dissemination. To overcome the drawbacks associated with the use of inactivated and attenuated vaccines we engineered a new recombinant BTV vaccine candidate based on proteins VP2, VP7, and NS1 of BTV-4 that were incorporated into avian reovirus muNS-Mi microspheres (MS-VP2/VP7/NS1) and recombinant modified vaccinia virus Ankara (rMVA)...
March 18, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28321412/recombinant-lactococcus-lactis-expressing-haemagglutinin-from-a-polish-avian-h5n1-isolate-and-its-immunological-effect-in-preliminary-animal-trials
#8
Agnieszka K Szczepankowska, Katarzyna Szatraj, Przemysław Sałański, Agnieszka Rózga, Roman K Górecki, Jacek K Bardowski
Lactic acid bacteria (LAB) are Gram-positive, nonpathogenic microorganisms that are gaining much interest as antigen producers for development of live vaccine vectors. Heterologous proteins of different origin have been successfully expressed in various LAB species, including Lactococcus lactis. Recombinant L. lactis strains have been shown to induce specific local and systemic immune responses against various antigens. Our study aimed at constructing a L. lactis strain expressing haemagglutinin of a Polish avian H5H1 influenza isolate and examining its effect on animals...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28321220/adjusted-particle-size-eliminates-the-need-of-linkage-of-antigen-and-adjuvants-for-appropriated-t-cell-responses-in-virus-like-particle-based-vaccines
#9
Ariane C Gomes, Anna Flace, Philippe Saudan, Franziska Zabel, Gustavo Cabral-Miranda, Aadil El Turabi, Vania Manolova, Martin F Bachmann
Since the discovery of the first virus-like particle (VLP) derived from hepatitis B virus in 1980 (1), the field has expanded substantially. Besides successful use of VLPs as safe autologous virus-targeting vaccines, the powerful immunogenicity of VLPs has been also harnessed to generate immune response against heterologous and even self-antigens (2-4). Linking adjuvants to VLPs displaying heterologous antigen ensures simultaneous delivery of all vaccine components to the same antigen-presenting cells. As a consequence, antigen-presenting cells, such as dendritic cells, will process and present the antigen displayed on VLPs while receiving costimulatory signals by the VLP-incorporated adjuvant...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28321217/a-vaccine-therapy-for-canine-visceral-leishmaniasis-promoted-significant-improvement-of-clinical-and-immune-status-with-reduction-in-parasite-burden
#10
Bruno Mendes Roatt, Rodrigo Dian de Oliveira Aguiar-Soares, Levi Eduardo Soares Reis, Jamille Mirelle de Oliveira Cardoso, Fernando Augusto Siqueira Mathias, Rory Cristiane Fortes de Brito, Sydnei Magno da Silva, Nelder De Figueiredo Gontijo, Sidney de Almeida Ferreira, Jesus G Valenzuela, Rodrigo Corrêa-Oliveira, Rodolfo Cordeiro Giunchetti, Alexandre Barbosa Reis
Herein, we evaluated the treatment strategy employing a therapeutic heterologous vaccine composed of antigens of Leishmania braziliensis associated with MPL adjuvant (LBMPL vaccine) for visceral leishmaniasis (VL) in symptomatic dogs naturally infected by Leishmania infantum. Sixteen dogs received immunotherapy with MPL adjuvant (n = 6) or with a vaccine composed of antigens of L. braziliensis associated with MPL (LBMPL vaccine therapy, n = 10). Dogs were submitted to an immunotherapeutic scheme consisting of 3 series composed of 10 subcutaneous doses with 10-day interval between each series...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28318765/in-vivo-electroporation-in-dna-vlp-prime-boost-preferentially-enhances-hiv-1-envelope-specific-igg2a-neutralizing-antibody-and-cd8-t-cell-responses
#11
Xun Huang, Qianqian Zhu, Xiaoxing Huang, Lifei Yang, Yufeng Song, Ping Zhu, Paul Zhou
Although in vivo electroporation (EP) has been utilized to improve immunogenicity in DNA vaccines alone or in prime-boost regimens with both proteins and viral-vectors, no studies on in vivo EP in DNA-VLP prime-boost regimens against HIV-1 have been reported. Previously we developed stably transfected Drosophila S2 clones to produce HIV-1 virus-like particles (VLP) and demonstrated that priming mice twice with DNA plasmids encoding HIV-1 gp120 and gag and boosting twice with HIV-1 VLP (i.e. DDVV immunization) elicited both envelope-specific antibody and envelope and gag-specific CD8 T cell responses...
March 16, 2017: Vaccine
https://www.readbyqxmd.com/read/28315707/combined-administration-of-synthetic-rna-and-a-conventional-vaccine-improves-immune-responses-and-protection-against-foot-and-mouth-disease-virus-in-swine
#12
Belén Borrego, Esther Blanco, Miguel Rodríguez Pulido, Francisco Mateos, Gema Lorenzo, Sabrina Cardillo, Eliana Smitsaart, Francisco Sobrino, Margarita Sáiz
Foot-and-mouth disease virus (FMDV) is the causative agent of a highly contagious disease and a major concern in animal health worldwide. We have previously reported the use of RNA transcripts mimicking structural domains in the non-coding regions of the FMDV RNA as potent type-I interferon (IFN) inducers showing antiviral effect in vivo, as well as their immunomodulatory properties in combination with an FMD vaccine in mice. Here, we describe the enhancing effect of RNA delivery on the immunogenicity and protection induced by a suboptimal dose of a conventional FMD vaccine in pigs...
March 16, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28302457/mucosal-vaccination-with-heterologous-viral-vectored-vaccine-targeting-subdominant-siv-accessory-antigens-strongly-inhibits-early-viral-replication
#13
Huanbin Xu, Anne-Marie Andersson, Emeline Ragonnaud, Ditte Boilesen, Anders Tolver, Benjamin Anderschou Holbech Jensen, James L Blanchard, Alfredo Nicosia, Antonella Folgori, Stefano Colloca, Riccardo Cortese, Allan Randrup Thomsen, Jan Pravsgaard Christensen, Ronald S Veazey, Peter Johannes Holst
Conventional HIV T cell vaccine strategies have not been successful in containing acute peak viremia, nor in providing long-term control. We immunized rhesus macaques intramuscularly and rectally using a heterologous adenovirus vectored SIV vaccine regimen encoding normally weakly immunogenic tat, vif, rev and vpr antigens fused to the MHC class II associated invariant chain. Immunizations induced broad T cell responses in all vaccinees. Following up to 10 repeated low-dose intrarectal challenges, vaccinees suppressed early viral replication (P=0...
March 8, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28301479/ligb-subunit-vaccine-confers-sterile-immunity-against-challenge-in-the-hamster-model-of-leptospirosis
#14
Neida L Conrad, Flávia W Cruz McBride, Jéssica D Souza, Marcelle M Silveira, Samuel Félix, Karla S Mendonça, Cleiton S Santos, Daniel A Athanazio, Marco A Medeiros, Mitermayer G Reis, Odir A Dellagostin, Alan J A McBride
Neglected tropical diseases, including zoonoses such as leptospirosis, have a major impact on rural and poor urban communities, particularly in developing countries. This has led to major investment in antipoverty vaccines that focus on diseases that influence public health and thereby productivity. While the true, global, impact of leptospirosis is unknown due to the lack of adequate laboratory diagnosis, the WHO estimates that incidence has doubled over the last 15 years to over 1 million cases that require hospitalization every year...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28300196/recombinant-mycobacterium-smegmatis-with-a-pmyong2-vector-expressing-human-immunodeficiency-virus-type-i-gag-can-induce-enhanced-virus-specific-immune-responses
#15
Byoung-Jun Kim, Jeong-Ryeol Gong, Ga-Na Kim, Bo-Ram Kim, So-Young Lee, Yoon-Hoh Kook, Bum-Joon Kim
Recently, we have developed a novel Mycobacterium-Escherichia coli shuttle vector system using pMyong2, which can provide an enhanced expression of heterologous genes in recombinant Mycobacterium smegmatis (rSmeg). To investigate the usefulness of rSmeg using pMyong2 in vaccine application, we vaccinated M. smegmatis with pMyong2 system expressing Human Immunodeficiency Virus Type I (HIV-1) Gag p24 antigen (rSmeg-pMyong2-p24) into mice and examined its cellular and humoral immune responses against HIV gag protein...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28297677/recombinant-bcg-expressing-esx-1-of-mycobacterium-marinum-combines-low-virulence-with-cytosolic-immune-signaling-and-improved-tb-protection
#16
Matthias I Gröschel, Fadel Sayes, Sung Jae Shin, Wafa Frigui, Alexandre Pawlik, Mickael Orgeur, Robin Canetti, Nadine Honoré, Roxane Simeone, Tjip S van der Werf, Wilbert Bitter, Sang-Nae Cho, Laleh Majlessi, Roland Brosch
Recent insights into the mechanisms by which Mycobacterium tuberculosis, the etiologic agent of human tuberculosis, is recognized by cytosolic nucleotide sensors have opened new avenues for rational vaccine design. The only licensed anti-tuberculosis vaccine, Mycobacterium bovis BCG, provides limited protection. A feature of BCG is the partial deletion of the ESX-1 type VII secretion system, which governs phagosomal rupture and cytosolic pattern recognition, key intracellular phenotypes linked to increased immune signaling...
March 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/28295939/lactic-acid-bacteria-promising-vaccine-vectors-possibilities-limitations-doubts
#17
REVIEW
Katarzyna Szatraj, Agnieszka K Szczepankowska, Magdalena Chmielewska-Jeznach
Gram-positive, nonpathogenic lactic acid bacteria (LAB) are considered to be promising candidates for the development of novel, safe production and delivery systems of heterologous proteins. Recombinant LAB strains were shown to elicit specific systemic and mucosal immune responses against selected antigens. For this reason this group of bacteria is considered as a potential replacement of classical, often pathogenic, attenuated bacteria carriers. Mucosal administration of recombinant LAB, especially via the best explored and universal oral route, offers many advantages in comparison to systemic inoculation, and is attractive from the immunological and practical point of view...
March 10, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28293238/role-of-memory-t-cells-in-allograft-rejection-and-tolerance
#18
REVIEW
Gilles Benichou, Bruno Gonzalez, Jose Marino, Katayoun Ayasoufi, Anna Valujskikh
Memory T cells are characterized by their low activation threshold, robust effector functions, and resistance to conventional immunosuppression and costimulation blockade. Unlike their naïve counterparts, memory T cells reside in and recirculate through peripheral non-lymphoid tissues. Alloreactive memory T cells are subdivided into different categories based on their origins, phenotypes, and functions. Recipients whose immune systems have been directly exposed to allogeneic major histocompatibility complex (MHC) molecules display high affinity alloreactive memory T cells...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28288798/probing-the-efficacy-of-a-heterologous-leishmania-l-viannia-braziliensis-recombinant-enolase-as-a-candidate-vaccine-to-restrict-the-development-of-l-infantum-in-balb-c-mice
#19
Thaís T O Santos, Vívian T Martins, Daniela P Lage, Lourena E Costa, Beatriz C S Salles, Ana M R S Carvalho, Daniel S Dias, Patrícia A F Ribeiro, Miguel A Chávez-Fumagalli, Ricardo A Machado-de-Ávila, Bruno M Roatt, Danielle F de Magalhães-Soares, Daniel Menezes-Souza, Eduardo A F Coelho, Mariana C Duarte
In the present study, the Leishmania braziliensis enolase protein was evaluated as a vaccine candidate against visceral leishmaniasis (VL). The DNA sequence was cloned and the recombinant protein (rEnolase) was evaluated as a vaccine, associated with saponin, as an immune adjuvant. The protective efficacy of the rEnolase plus saponin combination was investigated in BALB/c mice against Leishmania infantum infection. The results revealed that the vaccine induced higher levels of IFN-γ, IL-12, and GM-CSF when a capture ELISA and flow cytometry were performed, as well as an antileishmanial nitrite production after using in vitro stimulation with rEnolase and an antigenic Leishmania preparation...
March 10, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28287405/t-cells-control-the-generation-of-nanomolar-affinity-anti-glycan-antibodies
#20
Zinaida Polonskaya, Shenglou Deng, Anita Sarkar, Lisa Kain, Marta Comellas-Aragones, Craig S McKay, Katarzyna Kaczanowska, Marie Holt, Ryan McBride, Valle Palomo, Kevin M Self, Seth Taylor, Adriana Irimia, Sanjay R Mehta, Jennifer M Dan, Matthew Brigger, Shane Crotty, Stephen P Schoenberger, James C Paulson, Ian A Wilson, Paul B Savage, M G Finn, Luc Teyton
Vaccines targeting glycan structures at the surface of pathogenic microbes must overcome the inherent T cell-independent nature of immune responses against glycans. Carbohydrate conjugate vaccines achieve this by coupling bacterial polysaccharides to a carrier protein that recruits heterologous CD4 T cells to help B cell maturation. Yet they most often produce low- to medium-affinity immune responses of limited duration in immunologically fit individuals and disappointing results in the elderly and immunocompromised patients...
March 13, 2017: Journal of Clinical Investigation
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