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Related Experiment Videos

Semiliki forest virus vector carrying the bovine viral diarrhea virus NS3 (p80) cDNA induced immune responses in mice

J R Reddy1, J Kwang, V Varthakavi

  • 1JN-International, Inc, Oakland, NE 68045, USA. jnii@trsonline.net

Comparative Immunology, Microbiology and Infectious Diseases
|August 28, 1999
PubMed
Summary
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This study shows that a DNA vaccine targeting the BVDV NS3 protein effectively stimulates cellular immunity in mice. While it didn't produce neutralizing antibodies, it induced significant cytotoxic T-lymphocyte activity against Bovine viral diarrhea virus.

Area of Science:

  • Veterinary Virology
  • Immunology
  • Vaccine Development

Background:

  • Bovine viral diarrhea virus (BVDV) causes significant economic losses in cattle due to enteric, respiratory, and reproductive issues.
  • The BVDV NS3 protein is a highly conserved target among Pestiviruses and elicits immune responses during infection.

Purpose of the Study:

  • To develop a DNA vaccine against BVDV using the conserved NS3 protein.
  • To evaluate the immunogenicity of a recombinant DNA vaccine expressing BVDV NS3 in a mouse model.

Main Methods:

  • Cloning the BVDV-NADL NS3 gene into a Semliki Forest virus expression vector (pSFV-1).
  • Intramuscular injection of the recombinant DNA into BALB/c mice to assess immune responses.
  • In vitro transcription to mRNA and transfection into BHK-21 and MDBK cells for antigen detection.

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Main Results:

  • BVDV-NS3 DNA inoculation induced significant cytotoxic T-lymphocyte (CTL) activity and cell-mediated immunity (CMI) against BVDV.
  • The vaccine did not elicit neutralizing antibodies against BVDV in the tested mice.
  • Recombinant cells expressing BVDV-NS3 were successfully used for immunological assays.

Conclusions:

  • BVDV-NS3 DNA vaccination is a viable strategy for inducing strong cellular immune responses in mice.
  • Targeting the conserved NS3 protein holds potential for developing effective BVDV vaccines focusing on cellular immunity.