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Related Experiment Videos

Immunization-induced decrease of the CD4+:CD8+ ratio in cats experimentally infected with feline immunodeficiency

R Lehmann1, B von Beust, E Niederer

  • 1Department of Veterinary Medicine, University of Zurich, Switzerland.

Veterinary Immunology and Immunopathology
|December 1, 1992
PubMed
Summary
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Feline immunodeficiency virus (FIV) infection may initially boost immune responses but gradually leads to immune suppression, evidenced by a declining CD4+:CD8+ ratio. This suggests FIV-infected cats could model AIDS pathogenesis.

Area of Science:

  • Immunology
  • Virology
  • Comparative Medicine

Background:

  • Previous experiments showed altered immune responses to a feline leukemia virus (FeLV) vaccine in cats infected with feline immunodeficiency virus (FIV).
  • FIV-infected cats exhibited a stronger primary immune response but a weaker secondary response to the FeLV vaccine compared to controls.
  • Dual infection with FIV and FeLV was also investigated in the context of immune responses.

Purpose of the Study:

  • To further investigate the immune response in FIV-infected cats following antigenic stimulation.
  • To assess changes in lymphocyte populations (CD4+, CD8+) and antibody production after immunization with a synthetic peptide (TGAL).
  • To evaluate the impact of FIV infection on the CD4+:CD8+ ratio as an indicator of immune suppression.

Main Methods:

Related Experiment Videos

  • Thirty specified pathogen-free (SPF) cats, previously infected with FIV or FIV-negative controls, were immunized twice with the synthetic peptide L-tyrosine-L-glutamic acid-poly(DL-alanine)-poly(L-lysine) (TGAL).
  • Blood samples were collected to measure antibodies to TGAL, perform complete blood cell counts, and quantify CD4+, CD8+, and pan-T-lymphocyte populations.
  • Enzyme-linked immunosorbent assay (ELISA) was used to assess antibody titers, and flow cytometry was employed for lymphocyte subset analysis.

Main Results:

  • Unlike the FeLV vaccine response, the primary immune response to TGAL was not significantly stronger in FIV-positive cats.
  • FIV-positive cats had a smaller absolute CD4+ lymphocyte population, with the lowest counts observed in dually FIV/FeLV infected cats.
  • The CD4+:CD8+ ratio decreased significantly in FIV-positive cats (from 1.9 to 1.3) during TGAL immunization, while it increased in FIV-negative cats (from 1.9 to 2.3).

Conclusions:

  • Short-term FIV infection may enhance immune responses to T-cell dependent antigens, but immune suppression develops gradually with infection duration.
  • The significant drop in the CD4+:CD8+ ratio suggests antigenic stimulation accelerates immune suppression in FIV-positive cats.
  • FIV-infected cats represent a valuable model for studying the pathogenesis of Acquired Immunodeficiency Syndrome (AIDS) due to similarities in immune dysregulation.