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heterologous immunity

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https://www.readbyqxmd.com/read/28542275/combination-of-the-immunization-with-the-sequence-close-to-the-consensus-sequence-and-two-dna-prime-plus-one-vlp-boost-generate-h5-hemagglutinin-specific-broad-neutralizing-antibodies
#1
Guiqin Wang, Renfu Yin, Paul Zhou, Zhuang Ding
Hemagglutinin (HA) head has long been considered to be able to elicit only a narrow, strain-specific antibody response as it undergoes rapid antigenic drift. However, we previously showed that a heterologous prime-boost strategy, in which mice were primed twice with DNA encoding HA and boosted once with virus-like particles (VLP) from an H5N1 strain A/Thailand/1(KAN)-1/2004 (noted as TH DDV), induced anti-head broad cross-H5 neutralizing antibody response. To explain why TH DDV immunization could generate such breadth, we systemically compared the neutralization breadth and potency between TH DDV sera and immune sera elicited by TH DDD (three times of DNA immunizations), TH VVV (three times of VLP immunizations), TH DV (one DNA prime plus one VLP boost) and TK DDV (plasmid DNA and VLP derived from another H5N1 strain, A/Turkey/65596/2006)...
2017: PloS One
https://www.readbyqxmd.com/read/28537896/5t4-oncofoetal-glycoprotein-an-old-target-for-a-novel-prostate-cancer-immunotherapy
#2
Federica Cappuccini, Emily Pollock, Stephen Stribbling, Adrian V S Hill, Irina Redchenko
The tumour-associated antigen 5T4 is an attractive target for cancer immunotherapy. However to date, reported 5T4-specific cellular immune responses induced by various immunisation platforms have been largely weak or non-existent. In the present study, we have evaluated a heterologous prime boost regime based on the simian adenovirus ChAdOx1 and modified vaccinia virus Ankara (MVA) expressing 5T4 for immunogenicity and tumour protective efficacy in a mouse cancer model. Vaccination-induced immune responses were strong, durable and attributable primarily to CD8+ T cells...
May 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28523921/combination-of-h120-and-1-96-avian-infectious-bronchitis-virus-vaccine-strains-protect-chickens-against-challenge-with-is-1494-06-variant-2-like-infectious-bronchitis-virus
#3
M Habibi, V Karimi, A G Langeroudi, S A Ghafouri, M Hashemzadeh, R K Farahani, H Maghsoudloo, H Abdollahi, P Seifouri
Avian infectious bronchitis (IB) is a worldwide chicken disease, caused by avian infectious bronchitis virus (IBV) which infects all commercial poultry lines. The present study was done to evaluate protection caused by two different serotype vaccines (Massachusetts and 793/B) in order to evaluate protection against challenge with IS/1494/06-like virus (variant 2-like virus), which is prevalent in the Middle East. SPF chickens were divided into four groups (n = 20). First and second group as negative control group and non-vaccinated-challenged group received no vaccine...
2017: Acta Virologica
https://www.readbyqxmd.com/read/28523396/clostridium-perfringens-beta-toxin-dna-prime-protein-boost-elicits-enhanced-protective-immune-response-in-mice
#4
Amit Kumar Solanki, Bharati Bhatia, Himani Kaushik, Sachin K Deshmukh, Aparna Dixit, Lalit C Garg
Clostridium perfringens beta toxin (CPB) is the primary pathogenic factor responsible for necrotic enteritis in sheep, cattle and humans. Owing to rapid progression of the disease, vaccination is the only possible recourse to avoid high mortality in animal farms and huge economic losses. The present study reports evaluation of a cpb gene-based DNA vaccine encoding the beta toxin of C. perfringens with homologous as well as heterologous booster strategy. Immunization strategy employing heterologous booster with heat-inactivated rCPB mounted stronger immune response when compared to that generated by homologous booster...
May 18, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28522212/bioengineering-bacterial-outer-membrane-vesicles-as-vaccine-platform
#5
REVIEW
Matthias J H Gerritzen, Dirk E Martens, René H Wijffels, Leo van der Pol, Michiel Stork
Outer membrane vesicles (OMVs) are naturally non-replicating, highly immunogenic spherical nanoparticles derived from Gram-negative bacteria. OMVs from pathogenic bacteria have been successfully used as vaccines against bacterial meningitis and sepsis among others and the composition of the vesicles can easily be engineered. OMVs can be used as a vaccine platform by engineering heterologous antigens to the vesicles. The major advantages of adding heterologous proteins to the OMV are that the antigens retain their native conformation, the ability of targeting specific immune responses, and a single production process suffices for many vaccines...
May 15, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28501809/non-specific-effects-of-vaccines-plausible-and-potentially-important-but-implications-uncertain
#6
REVIEW
Andrew J Pollard, Adam Finn, Nigel Curtis
Non-specific effects (NSE) or heterologous effects of vaccines are proposed to explain observations in some studies that certain vaccines have an impact beyond the direct protection against infection with the specific pathogen for which the vaccines were designed. The importance and implications of such effects remain controversial. There are several known immunological mechanisms which could lead to NSE, since it is widely recognised that the generation of specific immunity is initiated by non-specific innate immune mechanisms that may also have wider effects on adaptive immune function...
May 13, 2017: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/28501509/designer-outer-membrane-vesicles-as-immunomodulatory-systems-reprogramming-bacteria-for-vaccine-delivery
#7
Yehou M D Gnopo, Hannah C Watkins, Taylor C Stevenson, Matthew P DeLisa, David Putnam
Vaccines often require adjuvants to be effective. Traditional adjuvants, like alum, activate the immune response but in an uncontrolled way. Newer adjuvants help to direct the immune response in a more coordinated fashion. Here, we review the opportunity to use the outer membrane vesicles (OMVs) of bacteria as a way to modulate the immune response toward making more effective vaccines. This review outlines the different types of OMVs that have been investigated for vaccine delivery and how they are produced...
May 10, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/28499553/nasal-delivery-of-protollin-adjuvanted-h5n1-vaccine-induces-enhanced-systemic-as-well-as-mucosal-immunity-in-mice
#8
Weiping Cao, Jin Hyang Kim, Adrian J Reber, Mary Hoelscher, Jessica A Belser, Xiuhua Lu, Jacqueline M Katz, Shivaprakash Gangappa, Martin Plante, David S Burt, Suryaprakash Sambhara
Sporadic, yet frequent human infections with avian H5N1 influenza A viruses continue to pose a potential pandemic threat. Poor immunogenicity of unadjuvanted H5N1 vaccines warrants developing novel adjuvants and formulations as well as alternate delivery systems to improve their immunogenicity and efficacy. Here, we show that Protollin, a nasal adjuvant composed of Neisseria meningitides outer membrane proteins non-covalently linked to Shigella flexneri 2a lipopolysaccharide, is a potent nasal adjuvant for an inactivated split virion H5N1 clade 1 A/Viet Nam1203/2004 (A/VN/1203/04) vaccine in a mouse model...
June 5, 2017: Vaccine
https://www.readbyqxmd.com/read/28497863/ctla-4-expressed-by-foxp3-treg-cells-prevents-inflammatory-tissue-attack-and-not-t-cell-priming-in-arthritis
#9
Katrin Klocke, Rikard Holmdahl, Kajsa Wing
Cytotoxic T-lymphocyte antigen 4 (CTLA-4)-mediated regulation of already tolerized autoreactive T cells is critical for understanding autoimmune responses. While defects in CTLA-4 contribute to abnormal FOXP3(+) regulatory T cell (Treg) function in rheumatoid arthritis (RA) its role in autoreactive T cells remains elusive. We studied immunity towards the dominant collagen type-II (CII) T cell epitope in collagen-induced arthritis (CIA) both in the heterologous setting and in the autologous setting where CII is mutated at position E266D in mouse cartilage...
May 12, 2017: Immunology
https://www.readbyqxmd.com/read/28490598/development-of-clade-specific-and-broadly-reactive-live-attenuated-influenza-virus-vaccines-against-rapidly-evolving-h5-subtype-viruses
#10
Kobporn Boonnak, Yumiko Matsuoka, Weijia Wang, Amorsolo L Suguitan, Zhongying Chen, Myeisha Paskel, Mariana Baz, Ian Moore, Hong Jin, Kanta Subbarao
We have developed pandemic live attenuated influenza vaccines (pLAIV) against clade 1 H5N1 viruses on an Ann Arbor cold-adapted (ca) backbone that induced long-term immune memory. In 2015, many human infections caused by a new clade (2.2.1.1) of goose/Guangdong (gs/GD) lineage H5N1 viruses were reported in Egypt that prompted updating of the H5N1 pLAIV. We explored two strategies to generate suitable pLAIVs: first to modify the hemagglutinin gene of a highly pathogenic wild-type (wt) clade 2.2.1.1 virus A/Egypt/N03434/2009 (Egy/09) (H5N1) with its unmodified neuraminidase (NA) gene; this virus was designated Egy/09 ca The second approach was to select a low pathogenicity avian influenza H5 virus that elicited antibodies that cross-reacted with a broad range of H5 viruses, including the Egypt H5N1 viruses and contained a novel NA subtype for humans...
May 10, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28487055/recombinant-vaccinia-vector-based-vaccine-tiantan-boosting-a-novel-hbv-subunit-vaccine-induced-more-robust-and-lasting-immunity-in-rhesus-macaques
#11
Yao Deng, Xia Chuai, Pan Chen, Hong Chen, Wen Wang, Li Ruan, Wenhui Li, Wenjie Tan
This study explored several prime-boost strategies in rhesus macaques using various novel hepatitis B virus (HBV) vaccines that showed promise as prophylactic and therapeutic approaches in our previous study using in a mouse model. The tested vaccines included an HBV particle subunit (HBSS1) vaccine and the recombinant vaccinia (RVJSS1) or adenoviral (rAdSS1) vector-based vaccines containing S (1-223aa) and PreS1 (21-47aa). The strength and maintenance of humoral activity (IgG and neutralizing antibodies) and cellular immunity (interferon-γ production assessed by IFN-γ enzyme-linked immunosorbent spot (ELISpot) assay) were investigated in a longitudinal study following various vaccination protocols until 79weeks post-vaccination...
June 5, 2017: Vaccine
https://www.readbyqxmd.com/read/28484076/sarcoma-eradication-by-doxorubicin-and-targeted-tnf-relies-upon-cd8-t-cell-recognition-of-a-retroviral-antigen
#12
Philipp Probst, Janine Kopp, Annette Oxenius, Mario P Colombo, Danilo Ritz, Tim Fugmann, Dario Neri
Antibody-cytokine complexes may offer new tools to treat cancer. Here we show how TNF-linked antibodies, which recognize tumor-selective splice isoforms of fibronectin (F8-TNF), can be exploited to eradicate sarcomas in immunocompetent mice. We treated mice bearing WEHI-164 fibrosarcoma with a combination of F8-TNF and doxorubicin, curing the majority of treated animals (29/37). Notably, cured mice were resistant to re-challenge not only by WEHI-164 cells but also heterologous C51 or CT26 colorectal tumor cells in a CD8+ T cell-dependent process...
May 8, 2017: Cancer Research
https://www.readbyqxmd.com/read/28483582/the-role-of-heterotypic-denv-specific-cd8-t-lymphocytes-in-an-immunocompetent-mouse-model-of-secondary-dengue-virus-infection
#13
Laura B Talarico, Juan P Batalle, Alana B Byrne, Jorge M Brahamian, Adrián Ferretti, Ayelén G García, Aldana Mauri, Carla Simonetto, Diego R Hijano, Andrea Lawrence, Patricio L Acosta, Mauricio T Caballero, Yésica Paredes Rojas, Lorena I Ibañez, Guillermina A Melendi, Félix A Rey, Elsa B Damonte, Eva Harris, Fernando P Polack
Dengue is the most prevalent arthropod-borne viral disease worldwide and is caused by the four dengue virus serotypes (DENV-1-4). Sequential heterologous DENV infections can be associated with severe disease manifestations. Here, we present an immunocompetent mouse model of secondary DENV infection using non mouse-adapted DENV strains to investigate the pathogenesis of severe dengue disease. C57BL/6 mice infected sequentially with DENV-1 (strain Puerto Rico/94) and DENV-2 (strain Tonga/74) developed low platelet counts, internal hemorrhages, and increase of liver enzymes...
April 27, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28483199/a-prime-boost-immunization-regimen-based-on-a-simian-adenovirus-36-vectored-multi-stage-malaria-vaccine-induces-protective-immunity-in-mice
#14
Jairo A Fonseca, Jessica N McCaffery, Elena Kashentseva, Balwan Singh, Igor P Dmitriev, David T Curiel, Alberto Moreno
Malaria remains a considerable burden on public health. In 2015, the WHO estimates there were 212 million malaria cases causing nearly 429,000 deaths globally. A highly effective malaria vaccine is needed to reduce the burden of this disease. We have developed an experimental vaccine candidate (PyCMP) based on pre-erythrocytic (CSP) and erythrocytic (MSP1) stage antigens derived from the rodent malaria parasite P. yoelii. Our protein-based vaccine construct induces protective antibodies and CD4(+) T cell responses...
May 31, 2017: Vaccine
https://www.readbyqxmd.com/read/28475238/antecedent-nippostrongylus-infection-alters-the-lung-immune-response-to-plasmodium-berghei
#15
J M Craig, A L Scott
In endemic regions, it is not uncommon for patients to be co-infected with soil-transmitted helminthes and malaria. Although both malaria and many helminth species use the lungs as a site of development, little attention has been paid to the impact that pulmonary immunity induced by one parasite has on the lung response to the other. To model the consequences of a prior hookworm exposure on the development of immunity to malaria in the lungs, mice were infected with Nippostrongylus brasiliensis and two weeks later challenged with Plasmodium berghei...
May 5, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28470603/a-generic-protocol-for-purifying-disulfide-bonded-domains-and-random-protein-fragments-using-fusion-proteins-with-sumo3-and-cleavage-by-senp2-protease
#16
Hüseyin Besir
Recombinant expression of heterologous proteins in E. coli is well established for a wide range of proteins, although in many cases, purifying soluble and properly folded proteins remains challenging (Sorensen and Mortensen, J Biotechnol 115:113-128, 2005; Correa and Oppezzo, Methods Mol Biol 1258:27-44, 2015). Proteins that contain disulfide bonds (e.g., cytokines, growth factors) are often particularly difficult to purify in soluble form and still need optimizing of protocols in almost every step of the process (Berkmen, Protein Expr Purif 82:240-251, 2012; de Marco, Microb Cell Fact 11:129, 2012)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28468662/heterologous-expression-of-abaecin-peptide-from-apis-mellifera-in-pichia-pastoris
#17
Denis Prudencio Luiz, Juliana Franco Almeida, Luiz Ricardo Goulart, Nilson Nicolau-Junior, Carlos Ueira-Vieira
BACKGROUND: Antimicrobial peptides (AMPs) are the first line of host immune defense against pathogens. Among AMPs from the honeybee Apis mellifera, abaecin is a major broad-spectrum antibacterial proline-enriched cationic peptide. RESULTS: For heterologous expression of abaecin in Pichia pastoris, we designed an ORF with HisTag, and the codon usage was optimized. The gene was chemically synthetized and cloned in the pUC57 vector. The new ORF was sub-cloned in the pPIC9 expression vector and transformed into P...
May 3, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28468279/applying-unconventional-secretion-in-ustilago-maydis-for-the-export-of-functional-nanobodies
#18
Marius Terfrüchte, Michèle Reindl, Silke Jankowski, Parveen Sarkari, Michael Feldbrügge, Kerstin Schipper
Exploiting secretory pathways for production of heterologous proteins is highly advantageous with respect to efficient downstream processing. In eukaryotic systems the vast majority of heterologous proteins for biotechnological application is exported via the canonical endoplasmic reticulum-Golgi pathway. In the endomembrane system target proteins are often glycosylated and may thus be modified with foreign glycan patterns. This can be destructive for their activity or cause immune reactions against therapeutic proteins...
April 29, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28467432/lactobacillus-plantarum-producing-a-chlamydia-trachomatis-antigen-induces-a-specific-iga-response-after-mucosal-booster-immunization
#19
Katarzyna Kuczkowska, Ine Myrbråten, Lise Øverland, Vincent G H Eijsink, Frank Follmann, Geir Mathiesen, Jes Dietrich
Mucosal immunity is important for the protection against a wide variety of pathogens. Traditional vaccines administered via parenteral routes induce strong systemic immunity, but they often fail to generate mucosal IgA. In contrast, bacteria-based vaccines comprise an appealing strategy for antigen delivery to mucosal sites. Vaginal infection with Chlamydia trachomatis can develop into upper genital tract infections that can lead to infertility. Therefore, the development of an effective vaccine against Chlamydia is a high priority...
2017: PloS One
https://www.readbyqxmd.com/read/28465096/immunological-considerations-regarding-parental-concerns-on-pediatric-immunizations
#20
REVIEW
Francesco Nicoli, Victor Appay
Despite the fundamental role of vaccines in the decline of infant mortality, parents may decide to decline vaccination for their own children. Many factors may influence this decision, such as the belief that the infant immune system is weakened by vaccines, and concerns have been raised about the number of vaccines and the early age at which they are administered. Studies focused on the infant immune system and its reaction to immunizations, summarized in this review, show that vaccines can overcome those suboptimal features of infant immune system that render them more at risk of infections and of their severe manifestations...
April 29, 2017: Vaccine
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