[Elevation of IFN-gamma transcription level in peripheral blood mononuclear cells of EIAV vaccinated horses].

The research article evaluates the link between the level of IFN-gamma mRNA transcription in peripheral blood mononuclear cells (PBMC) and the immune response triggered by a specific vaccine, the donkey leukocyte attenuated vaccine of Equine Infectious Anemia Virus (EIAV). The study saw higher IFN-gamma mRNA transcription levels in vaccinated horses, which rose even after exposure to virulent EIAV strains, showing potential insights into the vaccine’s immunity mechanism.

Objective and Methods

• The key objective of this study was to assess the correlation between the transcriptional level of IFN-gamma mRNA in peripheral blood mononuclear cells (PBMC) and the immune protective response triggered by vaccinated horses with an EIAV (DLV) attenuated vaccine. The study also sought to clarify the DLV’s immune mechanism.
• To achieve these goals, a real-time PCR method was established to quantify the levels of IFN-gamma mRNA from horse PBMCs. A total of twelve horses were divided into several groups: vaccination, healthy control, challenging control, and EIAV natural infection group.
• The researchers analyzed the transcriptional level and distribution of IFN-gamma mRNA in the PBMCs and closely monitored parameters such as temperature on a daily basis. Some of the horses inoculated with the DLV vaccine were challenged post-inoculation, and the changes in IFN-gamma mRNA transcriptional level were evaluated pre/post-challenge.

Results

• The study found that the transcriptional level of IFN-gamma mRNA was significantly higher in the vaccination group compared to the healthy control and natural infection groups. This high level not only persisted but actually increased even after the horses were exposed to virulent EIAV strains.
• In the challenging control group, there was a noticeable fluctuation in the IFN-gamma mRNA transcriptional level with the progression of the disease. Moreover, during febrific episodes, a marked reduction in this level was observed.

Conclusions

• The researchers concluded that the EIAV-attenuated vaccine could induce a high level of IFN-gamma mRNA transcription, which is closely associated with the immune protective response induced by DLV.
• This is the first study of its kind to reveal this association, providing valuable insights into the molecular mechanisms of DLV’s immunity protection. This information could prove incredibly useful for future vaccine research and development efforts.