CpG-ODN class C-mediated immunostimulation and its potential against Trypanosoma evansi in equines.

The study reveals that CpG-ODN class-C stimulates an immune response in horses against Trypanosoma evansi, a parasite responsible for “surra”, a know. disease in animals and occasionally in humans.

Introduction to the Problem

• Trypanosoma evansi causes a disease named ‘surra,’ which has a substantial impact on animals. Although primarily affecting animals, cases in humans have also been reported.
• The parasite displays continuous variations in its vertex surface glycoprotein (VSG), the thick immunogenic surface coat. This constant change enables the parasite to escape the host’s immune response, making vaccination strategies ineffective.
• Therefore, there’s a great need for alternative tactics to boost the immune response against the parasite’s infection.

About CpG-ODN class-C

• The study focuses on CpG-ODN class-C, which combines the immune effects of both class-A and class-B CpG-ODN.
• The researchers noticed that CpG-ODN class-C stimulates horse peripheral blood mononuclear cells (PBMCs) to express several immune response-indicating elements, such as interferon-α (IFN-α), tumour necrosis factor-α (TNF-α), IL-12 and nitric oxide (NO).

Experiment and Result

• The study co-cultured CpG-ODN with the T. evansi antigen, showing that this method induces lymphocyte proliferative responses. This reaction, in turn, results in a synergistic effect enhancing the immune response.
• The experiment highlights an important progression in formulating an effective response against trypanosomosis. In particular, it shows how a substance like CpG-ODN class-C can stimulate the immune system to react against the disease.
• It is the first of its kind to demonstrate the beneficial synergy between CpG-ODN and the T. evansi antigen.