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Showing posts from June, 2020

Development of Actinobacillus pleuropneumoniae ApxI, ApxII, and ApxIII-specific ELISA methods for evaluation of vaccine efficiency.

Among the various vaccine against Actinobacillus pleuropneumoniae, subunit vaccine uses a recombinant protein from ApxI, ApxII, and ApxIII as vaccine antigens have shown good success in terms of security and protection. Therefore, subunit vaccines are being implemented around the world and the development of new subunit vaccines is actively being conducted. To evaluate the effectiveness of a subunit vaccine, it is important to measure the immune response to each toxin Apx separately. However, the cross-reactivity of antibodies makes it difficult to measure the immune reactivity specific to each toxin.  In this study, region-specific antigen between toxins identified and cloned to solve this problem. Respectively antigenicity of recombinant proteins Hapten Conjugates Proteins demonstrated by Western blot. Using recombinant proteins, we developed Immunosorbent Assay (ELISA) enzyme-linked method that can detect immune response specific for each Apx toxins in laboratory guinea pigs. ...

Mucosal Immunity against Neuraminidase Prevents Influenza B Virus Transmission in Guinea Pigs.

Despite efforts to control influenza virus infection and transmission of influenza virus still causes significant morbidity and mortality in the global human population each year. Most of the vaccines currently targeting the immunodominant viral surface glycoprotein hemagglutinin. Cat Recombinant Proteins However, reducing the severity of disease and viral shedding has also been associated with antibody targeting the viral surface glycoprotein, the neuraminidase.  Importantly, immune antineuraminidase proved to be relatively wide, in contrast to the vaccine-induced antibodies to hemagglutinin head domain. In this study, we assessed the recombinant neuraminidase protein vaccination due to its ability to prevent or limit virus transmission. We vaccinated guinea pigs either intramuscular or intranasal influenza B virus neuraminidase to assess whether vaccination recombinant neuraminidase through these routes can prevent transmission of the virus homologous to the naive recipient. gu...

Construction, Expression and Evaluation of Recombinant VP2 Protein for serotype-independent Detection of FMDV Seropositive Animals in Egypt.

foot-and-mouth disease virus (FMDV) is one of the most devastating viral pathogens cloven-hoofed animals. Detecting antibody (Ab) against FMDV structural proteins (SP) test virus neutralization (VNT) and liquid phase blocking ELISA (LPBE) is a standard procedure Swine Recombinant Proteins that is used to monitor seroconversion in animals post-vaccination, the prevalence of infection-surveillance, proving the clinical cases and status seronegative of FMDV free / naïve animals before transport.  However, due to variations in the SP of FMDV serotypes, each serotype-specific Ab must be detected separately exhausting and time-consuming. Thus, it is very important to develop the test is sensitive, rapid, accurate and capable of detecting specific FMDV Ab, irrespective of its serotype. This study describes the VP2 protein heterologous expression in E. coli, and evaluation as an indirect antigen capture in simple ELISA for the detection of serotype-independent anti-FMDV Ab. sequence anal...

Probing Morbillivirus Antisera Neutralization Using Functional Chimerism between Measles Virus and Canine Distemper Virus Envelope Glycoproteins.

Measles virus (MeV) is monotypic. Live virus challenge provoke extensive protective humoral immune response that neutralizes all known genotypes of measles. Both surface glycoproteins, H and F, mediates viral attachment and entry, respectively, and neutralizing antibodies to H is considered a major correlate of protection.  Here, we make improvements to MeV system of reverse genetics and Rabbit Recombiant Proteins  generated a panel MeVs recombinant where the head domain globular or region stems from H glycoproteins or whole protein F, or both, are replaced with the domain corresponding protein of canine distemper virus (CDV), morbillivirus closely linked that resists neutralization by measles-immune sera. Virus tested sensitivity to human or guinea pig anti-MeV neutralizing antiserum and anti-CDV to ferret antisera.  Virus neutralization mediated by antibodies to both H and F protein, with H being immunodominant in the case MeV and F that is so in the case of CDV. In ad...

Surface plasmon resonance immunosensor for label-free detection of BIRC5 biomarker in spontaneously occurring canine mammary tumours.

We report the detection of apoptosis inhibitor Baculoviral repeat-containing 5 (BIRC5) serum protein biomarkers in dogs by surface plasmon resonance (SPR) immunosensor free label. Initially, overexpression BIRC5 in canine mammary tumors (CMT) network is confirmed by real-time PCR. BIRC5 recombinant proteins are produced and developed specific Horse Recombinant Proteins  antibodies in guinea pig specifically react with native proteins in immunohistochemistry and immunocytochemistry. SPR immunosensor antibody developed by fabricating anti-BIRC5 the sensor disk of gold. The equilibrium dissociation constant (KD = kd / ka) is 12.1 × 10-12 M; indicating that high affinity antibodies with a sensitivity in the picomolar range. SPR test can detect as low as 6.25 pg / ml protein in experimental calibration BIRC5 (r2 = 0.9964).  In real clinical sample testing, 95% specificity and sensitivity recorded 73.33%. The average amount BIRC5 serum in dogs with CMT was 110.02 ± 9.77 pg / ml; w...

In Vivo Assembly of Nanoparticles Achieved through Synergy of Structure-Based Protein Engineering and Synthetic DNA Generates Enhanced Adaptive Immunity.

Nano technology is considered increasingly important for the field of vaccines. Through the nanoparticles multivalent immunogens decor, designed nanovaccines   Feline Recombinant Proteins can cause enhanced humoral immunity. However, practical challenges and significant monetary nanovaccines in large scale production has hindered their widespread clinical translation. Here, the alternative approach described integrating c omputational protei n modeling and adaptive delivery of synthetic DNA electroporation-mediated, allowing direct in vivo production of nanovaccines.  DNA nanoparticle-launched featuring an immunogen shown HIV spontaneously assembled in vivo. DNA-launched nanovaccines induce a strong humoral response than their monomeric counterparts in both rats and guinea pigs, and unique cause CD8 + effector T-cell immunity compared to nanovaccines recombinant proteins. Improvements in vaccine response recapitulation when nanovaccines DNA-launched with alternative sc...