Self-replicating DNA vaccine elicits strong immunity in guinea pigs.

| Posted in: Science

Journal name: World Journal of Pharmaceutical Research
Original article title: Self replicating dna vaccine with polyvalent cterminal immune reactive protein gene of foot and mouth disease virus, constructed for humoral response, elicits a higher immune response in guinea pigs and protects against challenge viruses.
The WJPR includes peer-reviewed publications such as scientific research papers, reports, review articles, company news, thesis reports and case studies in areas of Biology, Pharmaceutical industries and Chemical technology while incorporating ancient fields of knowledge such combining Ayurveda with scientific data.
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Original source:

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Author:

Pranaya Pradhan, Reddy G. R., Suryanarayana V. V. S, Sarika Sasi and Dechamma, HJ


World Journal of Pharmaceutical Research:

(An ISO 9001:2015 Certified International Journal)

Full text available for: Self replicating dna vaccine with polyvalent cterminal immune reactive protein gene of foot and mouth disease virus, constructed for humoral response, elicits a higher immune response in guinea pigs and protects against challenge viruses.

Source type: An International Peer Reviewed Journal for Pharmaceutical and Medical and Scientific Research

Doi: 10.20959/wjpr20169-6985

Copyright (license): WJPR: All rights reserved


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Summary of article contents:

Introduction

Foot and Mouth Disease (FMD) is a highly contagious viral ailment that primarily affects cloven-footed animals, leading to significant economic losses in the livestock industry. The conventional method for controlling FMD in endemic regions involves mass vaccination with inactivated virus vaccines. However, these vaccines have notable limitations, including a limited duration of immune response, the potential for virus dissemination during production, and ineffectiveness against carrier animals. Consequently, there has been an urgent need for the development of alternative vaccines, one of which is the self-replicating DNA/RNA vaccine designed to evoke a strong immune response.

Self-Replicating DNA Vaccine Concept

The study introduced a self-replicating DNA/RNA vaccine utilizing the Sindbis virus replicase gene aimed at enhancing the expression of a polyvalent immunogen for FMD. Specifically, a multiple epitope gene corresponding to the C-terminal region of the VP1 protein from three Indian vaccine strains was cloned into the vaccine vector. This approach also aimed to stimulate both humoral (antibody-mediated) and cellular immune responses in vaccinated animals. Initial expression studies in BHK-21 cells yielded promising results, confirming successful antigen production. Such constructs have the potential to induce robust immune responses compared to conventional vaccines, addressing key limitations associated with traditional vaccination methods.

Immune Response and Efficacy in Guinea Pigs

Immune response studies were conducted in guinea pigs to evaluate the efficacy of the self-replicating DNA vaccine. An optimal dose was established through dose-response studies, indicating that a dosage between 100 ng and 1 μg elicited the best immune response. Following vaccination, antibody levels were assessed via ELISA and serum neutralization tests. The results demonstrated a significant antibody response in animals administered the self-replicating DNA vaccine, with higher titers observed compared to those administered conventional oil adjuvanted vaccines. This finding illustrates the vaccine’s ability to significantly stimulate the immune system.

Protective Efficacy Against Challenge Viruses

Further efficacy studies involved challenging vaccinated guinea pigs with various serotypes of FMDV. The results indicated that the self-replicating DNA vaccine provided a high level of protection, particularly against serotypes Asia 1 and A, with complete immunity observed in vaccinated animals. However, the protection against serotype O was not as robust. This variation highlights potential complexities in immune protection, suggesting that different serotypes may elicit varying responses, which could inform future adjustments in vaccine formulation strategies.

Conclusion

The development of a self-replicating DNA vaccine for Foot and Mouth Disease presents a promising alternative to conventional vaccination techniques. The initial studies indicate that this vaccine can elicit both humoral and cell-mediated immune responses, providing significant protection against different serotypes of the virus. Despite some variability in protection levels, particularly against serotype O, this innovative approach could lead to a safer and more potent method of immunization. Further evaluations in appropriate animal models, including bovines, are essential to validate these findings and enhance the vaccine's efficacy and duration of protection, ultimately paving the way for improved FMD control strategies globally.

FAQ section (important questions/answers):

What is the primary aim of the self-replicating DNA vaccine?

The self-replicating DNA vaccine aims to elicit both humoral and cellular immune responses against Foot and Mouth Disease Virus by expressing a polyvalent C-terminal immune reactive protein gene.

What are the limitations of conventional vaccines for FMD?

Conventional inactivated virus vaccines have drawbacks such as short-lasting immune responses, risks during preparation, and ineffectiveness against carrier animals, prompting the need for alternative vaccines.

How effective was the self-replicating DNA vaccine in guinea pigs?

In studies, the self-replicating DNA vaccine showed a high immune response in guinea pigs, offering better protection against FMD challenge viruses compared to traditional vaccines.

What type of immune response does the vaccine induce?

The vaccine is designed to induce both humoral antibody responses and cellular immune responses, which are essential for robust protection against different serotypes of FMD virus.

What methods were used to evaluate the vaccine's efficacy?

Efficacy was assessed using doses optimized for guinea pigs, along with ELISA and serum neutralization tests (SNT) to measure immune responses.

What further studies are needed for this vaccine?

Further studies are required to evaluate the vaccine’s efficacy in bovines and to optimize the formulation for improved protection and duration of immunity.

Glossary definitions and references:

Scientific and Ayurvedic Glossary list for “Self-replicating DNA vaccine elicits strong immunity in guinea pigs.”. This list explains important keywords that occur in this article and links it to the glossary for a better understanding of that concept in the context of Ayurveda and other topics.

1) Viru:
Viru refers to the category of pathogens, particularly viruses like the Foot and Mouth Disease Virus (FMDV), which is significant in veterinary medicine. Understanding these viruses is crucial for developing vaccines, controlling outbreaks, and mitigating their effects on livestock health and agricultural economies. Their study enhances vaccine efficacy and public health safety.

2) Animal:
Animal pertains to the subjects of the study, specifically cloven-hoofed animals that are affected by Foot and Mouth Disease (FMD). Their health impacts agricultural productivity and food security globally. Understanding animal responses to vaccines helps in designing effective vaccination strategies to combat diseases like FMD that affect livestock populations.

3) Disease:
Disease refers to the pathological condition, specifically Foot and Mouth Disease in this context. This viral disease causes significant morbidity and economic loss in livestock industries. Studying the disease is important for understanding its transmission, developing effective treatments, and formulating control strategies to protect animal health and agricultural economies.

4) Indian:
Indian relates to the geographical context of the study, referring specifically to the Indian strains of the FMD virus and their impact on local livestock. It underscores the importance of developing tailored vaccines and treatments based on regional viral strains and responses, emphasizing the relevance for public health and animal industry in India.

5) Pur:
Poor indicates the inadequate immune responses associated with conventional vaccines in some instances. This demonstrates the challenges faced in vaccine development and the necessity for innovative approaches, such as the self-replicating DNA vaccine mentioned in the study, to enhance immune responses and achieve better protection against viral infections.

6) Reason:
Reason relates to the rationale behind conducting the study, which stems from the need to overcome limitations of existing vaccination strategies against FMD. The urgency to develop more effective vaccines that elicit robust immune responses motivates research efforts focused on self-replicating DNA vaccines to enhance animal health protection.

7) India:
India refers to the country where the research is conducted, highlighting the significance of FMD as a prevalent disease affecting local livestock. Understanding the specifics of the disease and its economic implications for India is vital for developing localized vaccines and improving animal health within this agricultural context.

8) Study (Studying):
Study pertains to the research conducted to investigate the efficacy of the self-replicating DNA vaccine against FMD in guinea pigs. This involves detailed methodologies, immune response evaluations, and protection assessments. The study's findings contribute to broader scientific knowledge and potential practical applications in controlling livestock diseases.

9) Milk:
Milk is relevant as it signifies an important agricultural product derived from livestock, particularly cattle. Foot and Mouth Disease affects milk production, causing economic losses for farmers. Therefore, controlling this disease through effective vaccination strategies is crucial for maintaining milk supply and supporting the dairy industry.

10) Karnataka:
Karnataka is a state in India where the research is performed, emphasizing the regional context of Foot and Mouth Disease impacts. The state's agriculture, particularly livestock, is essential for its economy. This highlights the importance of tailored research in specific geographic locations for addressing local disease challenges.

11) Powder:
Powder refers to the defatted milk powder used in the study, indicative of the materials and methods relevant for immunological assays like ELISA. Its role in the experimental design demonstrates the necessity of using standard reagents for reliable measurement of immunological responses and vaccine efficacy in research.

12) Saxena (Sakshena, Saksena):
Saxena is likely a reference to one of the authors or researchers involved in the study. Their contributions help validate and enhance the experimental design, methodology, and interpretation of results within the study, linking the body of scientific literature to ongoing research efforts in veterinary biomedicine.

13) Table:
Table is a representation of data that summarizes observations or results from the experiments, providing a clear and concise way to present findings related to vaccine efficacy and animal responses. Tables are essential for organizing and analyzing experimental data efficiently in scientific reports.

14) Line:
Line as used in this context likely refers to ongoing research directions or methodologies adapted during the study. It emphasizes the continuous nature of scientific investigation, wherein findings lead to new hypotheses, further experiments, or applications that improve vaccine development against viral diseases like FMD.

15) Observation:
Observation pertains to the act of systematically noting and recording data related to immune responses or vaccine efficacy during the study. Observations are vital for drawing conclusions about the effectiveness of vaccines and their impact on animal health, contributing to the validation of research hypotheses.

16) Discussion:
Discussion is the section of a scientific article that interprets results, highlights their significance, and relates them to existing literature. It provides insights into the implications of the study's findings regarding the self-replicating DNA vaccine for Foot and Mouth Disease and suggests future research directions.

17) Antibiotic (Antibacterial):
Antibiotic relates to compounds used to combat bacterial infections, though not directly relevant in the context of viral diseases like FMD. Its mention may serve to contrast vaccine strategies aimed at viral pathogens and highlight the need for tailored approaches in disease management and treatment.

18) Pranaya:
Pranaya refers to one of the authors of the study, indicating their role in conducting the research and contributing to the scientific community’s understanding of viral diseases and vaccine development. Author recognitions are essential for attributing contributions and fostering collaborations in research.

19) Pradhan:
Pradhan is another author involved in the research, signifying their contribution and expertise in the field of veterinary virology and vaccine development. Recognizing authorship in scientific literature is crucial for crediting individuals’ work that advances knowledge in combating infectious diseases in livestock.

20) Surface:
Surface likely refers to the cell membrane aspects of vaccine constructs designed to present antigens for immune recognition. This highlights the importance of antigen presentation in eliciting robust immune responses, thereby improving vaccine efficacy and ultimately reducing disease prevalence in affected livestock populations.

21) Sharika (Sarika):
Sarika is one of the authors of the research article, playing a role in the study's design, analysis, or writing. Acknowledging authors allows for the evaluation of expertise behind the research findings, which are crucial for the integrity and credibility of scientific literature.

22) Family:
Family in this context relates to the classification of viruses or other pathogens. It emphasizes the broader biological categorization and association of Foot and Mouth Disease Virus with specific viral families, helping in understanding related diseases and the genetic characteristics significant for vaccine development.

23) Medium:
Medium refers to the culture medium utilized for growing cells during experiments to evaluate the vaccine construct. The choice of medium affects cellular behavior, antigen expression, and ultimately the outcome of immunological assays, making it a critical component in vaccine research methodologies.

24) Madra:
Madra is likely a typographical error for 'Madras,' indicating a geographic location relevant to the study or where the specific vaccine strains were developed. It underscores the historical context of vaccine strain isolation and its relevance to regional disease management efforts.

25) Kumar:
Kumar denotes one of the authors, highlighting individual contributions to the study. Such attributions signify collaboration and the collective effort of researchers in advancing veterinary sciences aimed at combating viral diseases in livestock.

26) Death:
Death indicates the severe impact of Foot and Mouth Disease, particularly on young animals that may suffer fatal outcomes. This emphasizes the need for effective vaccination strategies to protect livestock health and minimize mortality rates associated with viral infections.

27) Vira:
Vira refers generally to viruses or may imply a related context to the study's focus on viruses like FMDV. Understanding viral characteristics and behaviors is essential for vaccine development and disease control, influencing approaches to managing outbreaks in livestock.

28) Genu:
Genu is derived from terminology relating to the family classification of viruses, emphasizing the important taxonomy in understanding disease mechanisms, transmission, and interactions within infected hosts, crucial for effective vaccine design and epidemiological research.

29) Rice (Rce):
Rice likely refers to a specific study cited documenting alternative strategies in vaccine development, signaling the ongoing search for innovative solutions in veterinary medicine that aid in managing diseases affecting livestock populations and ultimately enhancing food security.

30) Post:
Post indicates actions taken after vaccination or intervention, such as monitoring immune responses or potential side effects. It underscores the importance of follow-up studies to assess the long-term efficacy and safety of new vaccine strategies in clinical and field settings.

31) Caci:
Sasi is another author involved in the research article, representing collaborative efforts in scientific investigations. Citing authors fosters accountability and promotes academic integrity within the research community, highlighting the expertise contributing to advancements in veterinary health sciences.

Other Science Concepts:

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Discover the significance of concepts within the article: ‘Self-replicating DNA vaccine elicits strong immunity in guinea pigs.’. Further sources in the context of Science might help you critically compare this page with similair documents:

Thermal stability, Vector control, Vaccine efficacy, Humoral Response, Antibody Response, Neutralizing Antibody Response, Vaccine Strains, Cytokine Response, Immunoblot Analysis, Guinea pig, Serotype.

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