scholarly journals Induction of specific immune response and suppression of fertility by B-cell-epitope-based mimovirus vaccine

Reproduction ◽  
2011 ◽  
Vol 142 (5) ◽  
pp. 659-666 ◽  
Author(s):  
Zi-gang Shen ◽  
Wei He ◽  
Ji Zhang ◽  
Hai-yang He ◽  
Xia Yang ◽  
...  
Keyword(s):  
B Cell ◽  
Cell Epitope ◽  
Reproductive Function ◽  
Serum Testosterone ◽  
Antigen Delivery ◽  
Dna Encoding ◽  
Igg Antibody ◽  
Humoral Immune ◽  
Contraceptive Vaccines

SPINLW1 (previously known as eppin (epididymal protease inhibitor)) is a target under intense scrutiny in the study of male contraceptive vaccines. B-cell-dominant epitopes are now recognized as key parts of the induction of humoral immune responses against target antigens. The generation of robust humoral responses in vivo has become a crucial problem in the development of modern vaccines. In this study, we developed a completely novel B-cell-dominant-epitope-based mimovirus vaccine, which is a kind of virus-size particulate antigen delivery system. The mimovirus successfully self-assembled from a cationic peptide containing a cell-penetrating peptide of TAT49–57 and a plasmid DNA encoding both three SPINLW1 (103–115) copies and adjuvant C3d3. The male mice were immunized with the epitope-based mimovirus vaccine, which resulted in a gradual elevation of specific serum IgG antibody levels. These reached a peak at week 4. Mating for the fertility assay showed that the mimovirus vaccine had accomplished a moderate fertility inhibition effect and investigation into the mechanism of action showed that it did so by interfering with the reproductive function of the sperm but that it did not damage the structures of the testes or cause serum testosterone to decline. Our results suggest an ideal protocol for suppressing fertility in mice by an engineered mimovirus vaccine.

scholarly journals Plasmodium vivax Cell-Traversal Protein for Ookinetes and Sporozoites: Naturally Acquired Humoral Immune Response and B-Cell Epitope Mapping in Brazilian Amazon Inhabitants

2017 ◽  
Vol 8 ◽  
Author(s):  
Rodrigo Nunes Rodrigues-da-Silva ◽  
Isabela Ferreira Soares ◽  
Cesar Lopez-Camacho ◽  
João Hermínio Martins da Silva ◽  
Daiana de Souza Perce-da-Silva ◽  
...  
Keyword(s):  
Immune Response ◽  
B Cell ◽  
Plasmodium Vivax ◽  
Humoral Immune Response ◽  
Epitope Mapping ◽  
Cell Epitope ◽  
Brazilian Amazon ◽  
Humoral Immune ◽  
B Cell Epitope

scholarly journals In vitro immunization approach to generate specific murine monoclonal IgG antibodies

2020 ◽  
Author(s):  
Sophia Michelchen ◽  
Burkhard Micheel ◽  
Katja Hanack
Keyword(s):  
Monoclonal Antibodies ◽  
Legionella Pneumophila ◽  
B Lymphocyte ◽  
Laboratory Animals ◽  
Igg Antibody ◽  
Simplified Approach ◽  
Humoral Immune ◽  
Viral Coat

AbstractGenerating monoclonal antibodies to date is a time intense process requiring immunization of laboratory animals. The transfer of the humoral immune response into in vitro settings shortens this process and circumvents the necessity of animal immunization. However, orchestrating the complex interplay of immune cells in vitro is very challenging. We aimed for a simplified approach focusing on the protagonist of antibody production: the B lymphocyte. We activated purified murine B lymphocytes in vitro with combinations of antigen and stimuli. Within ten days of culture we induced specific IgM and IgG antibody responses against a viral coat protein. Permanently antibody-producing hybridomas were generated. Furthermore we used this method to induce a specific antibody response against Legionella pneumophila. We thus established an effective protocol to generate monoclonal antibodies in vitro. By overcoming the necessity of in vivo immunization it may be the first step towards a universal strategy to generate antibodies from various species.

Epitope Mapping of Porphyromonas gingivalis Heat-shock Protein and Human Heat-shock Protein in Human Atherosclerosis

2004 ◽  
Vol 83 (12) ◽  
pp. 936-940 ◽  
Author(s):  
J.-I. Choi ◽  
S.-W. Chung ◽  
H.-S. Kang ◽  
B.Y. Rhim ◽  
Y.-M. Park ◽  
...  
Keyword(s):  
T Cell ◽  
Heat Shock ◽  
Heat Shock Protein ◽  
B Cell ◽  
Cell Epitope ◽  
T Cell Epitopes ◽  
Igg Antibody ◽  
B Cell Epitopes ◽  
Human Heat Shock Protein ◽  
Human Hsp60

To identify T- and/or cross-reactive B-cell epitopes of P. gingivalis and human heat-shock protein (HSP)60 in atherosclerosis patients, we synthesized 104 overlapping synthetic peptides spanning whole molecules of P. gingivalis HSP60 and human HSP60, respectively. T-cell epitopes of P. gingivalis HSP were identified with the use of previously established P. gingivalis HSP-reactive T-cell lines. B-cell epitopes of P. gingivalis HSP60 and human HSP60 were identified by the use of patients’ sera. Anti- P. gingivalis, anti- P. gingivalis HSP60, or anti-human HSP60 IgG antibody titers were higher in the atherosclerosis patients compared with the healthy subjects. Five immunodominant peptides of P. gingivalis HSP60, identified as T-cell epitopes, were also found to be B-cell epitopes. Moreover, 6 cross-reactive B-cell epitopes of human HSP60 were identified. It was concluded that P. gingivalis HSP60 might be involved in the immunoregulatory process of atherosclerosis, with common T- and/or B-cell epitope specificities and with cross-reactivity with human HSP60.

Redistribution of a murine humoral immune response following removal of an immunodominant B cell epitope from a recombinant fusion protein

1993 ◽  
Vol 30 (8) ◽  
pp. 733-739 ◽  
Author(s):  
Jean-Pierre Y. Scheerlinck ◽  
Robert Deleys ◽  
Eric Saman ◽  
Lea Brys ◽  
Anja Geldhof ◽  
...  
Keyword(s):  
Immune Response ◽  
Fusion Protein ◽  
B Cell ◽  
Humoral Immune Response ◽  
Cell Epitope ◽  
Recombinant Fusion Protein ◽  
Humoral Immune ◽  
B Cell Epitope

scholarly journals The in vivo function of a noncanonical TRAF2-binding domain in the C-terminus of CD40 in driving B-cell growth and differentiation

Blood ◽  
2007 ◽  
Vol 110 (1) ◽  
pp. 193-200 ◽  
Author(s):  
Li-Fan Lu ◽  
Cory L. Ahonen ◽  
Evan F. Lind ◽  
Vanitha S. Raman ◽  
W. James Cook ◽  
...  
Keyword(s):  
Immune Responses ◽  
B Cell ◽  
Cell Activation ◽  
Affinity Maturation ◽  
Functional Domain ◽  
Antibody Isotype ◽  
Humoral Immune ◽  
Humoral Immune Responses ◽  
Cell Immunity

The recruitment of tumor necrosis factor receptor–associated factors (TRAFs) 1, 2, 3, 5, and 6 to the CD40 cytoplasmic tail upon CD40 trimerization results in downstream signaling events that ultimately lead to CD40-dependent, thymus-dependent (TD) humoral immune responses. Previously, we have shown signaling through the C-terminal tail of CD40 in the absence of canonical TRAF-binding sites is capable of signaling through an alternative TRAF2-binding site. Here, we demonstrate that B cells from mice harboring CD40 with only the C-terminal tail can activate both canonical and noncanonical NFκB signaling pathways. Moreover, while lacking germinal center formation, several hallmarks of humoral immune responses including clonal B-cell activation/expansion, antibody isotype switching, and affinity maturation remain normal. This study demonstrates a new functional domain in CD40 that controls critical aspects of B-cell immunity in an in vivo setting.

Guanidinylated cationic nanoparticles as robust protein antigen delivery systems and adjuvants for promoting antigen-specific immune responses in vivo

2016 ◽  
Vol 4 (33) ◽  
pp. 5608-5620 ◽  
Author(s):  
Pan Li ◽  
Gaona Shi ◽  
Xiuyuan Zhang ◽  
Huijuan Song ◽  
Chuangnian Zhang ◽  
...  
Keyword(s):  
Immune Responses ◽  
Delivery Systems ◽  
Protein Antigen ◽  
Antigen Delivery ◽  
Humoral Immune ◽  
Humoral Immune Responses ◽  
Immune Adjuvants ◽  
Cationic Nanoparticles ◽  
Antigen Delivery Systems

Guanidinylated nanoparticles could act as effective immune adjuvants to elicit both potent antigen-specific cellular and humoral immune responses.

Protective Immunity Elicited by Vaccination with DNA Encoding for a B Cell and a T Cell Epitope of the A/PR/8/34 Influenza Virus

1997 ◽  
Vol 10 (3) ◽  
pp. 129-136 ◽  
Author(s):  
SOFIA CASARES ◽  
TEODOR-DORU BRUMEANU ◽  
ADRIAN BOT ◽  
CONSTANTIN A. BONA
Keyword(s):  
Influenza Virus ◽  
T Cell ◽  
B Cell ◽  
Protective Immunity ◽  
Cell Epitope ◽  
T Cell Epitope ◽  
Dna Encoding

scholarly journals Regeneration of immunocompetent B lymphopoiesis from pluripotent stem cells guided by transcription factors

2021 ◽  
Author(s):  
Qi Zhang ◽  
Bingyan Wu ◽  
Qitong Weng ◽  
Fangxiao Hu ◽  
Yunqing Lin ◽  
...  
Keyword(s):  
Stem Cells ◽  
B Cells ◽  
B Cell ◽  
Pluripotent Stem Cells ◽  
De Novo ◽  
Immune Memory ◽  
B Lymphopoiesis ◽  
Marginal Zone B Cells ◽  
Humoral Immune

AbstractRegeneration of functional B lymphopoiesis from pluripotent stem cells (PSCs) is challenging, and reliable methods have not been developed. Here, we unveiled the guiding role of three essential factors, Lhx2, Hoxa9, and Runx1, the simultaneous expression of which preferentially drives B lineage fate commitment and in vivo B lymphopoiesis using PSCs as a cell source. In the presence of Lhx2, Hoxa9, and Runx1 expression, PSC-derived induced hematopoietic progenitors (iHPCs) immediately gave rise to pro/pre-B cells in recipient bone marrow, which were able to further differentiate into entire B cell lineages, including innate B-1a, B-1b, and marginal zone B cells, as well as adaptive follicular B cells. In particular, the regenerative B cells produced adaptive humoral immune responses, sustained antigen-specific antibody production, and formed immune memory in response to antigen challenges. The regenerative B cells showed natural B cell development patterns of immunoglobulin chain switching and hypermutation via cross-talk with host T follicular helper cells, which eventually formed T cell-dependent humoral responses. This study exhibits de novo evidence that B lymphopoiesis can be regenerated from PSCs via an HSC-independent approach, which provides insights into treating B cell-related deficiencies using PSCs as an unlimited cell resource.

scholarly journals Construction of Epitope-Based Peptide Vaccine Against SARS-CoV-2: Immunoinformatics Study

2020 ◽  
Vol 14 (suppl 1) ◽  
pp. 999-1005 ◽  
Author(s):  
Viol Dhea Kharisma ◽  
Arif Nur Muhammad Ansori
Keyword(s):  
B Cell ◽  
Peptide Vaccine ◽  
Cell Epitope ◽  
Molecular Complexes ◽  
Cell Immune Response ◽  
Spike Glycoprotein ◽  
Conserved Region ◽  
Novel Coronavirus

Recently, a novel coronavirus (SARS-CoV-2) appeared which is conscientious for the current outbreak in China and rapidly spread worldwide. Unluckily, there is no approved vaccine found against SARS-CoV-2. Therefore, there is an urgent need for designing a suitable peptide vaccine constituent against the SARS-CoV-2. In this study, we characterized the spike glycoprotein of SARS-CoV-2 to obtain immunogenic epitopes. In addition, we used 58 SARS-CoV-2 isolates were retrieved from the Global Initiative on Sharing All Influenza Data (GISAID) and National Center for Biotechnology Information (NCBI), then aligned to obtain the conserved region of SARS-CoV-2 spike glycoprotein. The interaction between the conserved region with ACE2 receptor, a SARS-CoV-2 receptor on the host cell, has been evaluated through molecular docking approach. The B-cell epitope was identified using the immune epitope database (IEDB) web server. Interestingly, we recommend Pep_4 ADHQPQTFVNTELH as a epitope-based peptide vaccine candidate to deal with the SARS-CoV-2 outbreak. Pep_4 has a high level of immunogenicity and does not trigger autoimmune mechanisms. Pep_4 is capable of forming BCR/Fab molecular complexes with the lowest binding energy for activation of transduction signal the direct B-cell immune response. However, further study is suggested for confirmation (in vitro and in vivo).

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