Production of interleukin 2 and expression of interleukin 2 receptors by pony peripheral blood lymphocytes after stimulation with a soluble fraction of Trypanosoma evansi.

This study reveals that when pony peripheral blood lymphocytes (PBL) are stimulated by a soluble fraction of Trypanosoma evansi, the cells respond by proliferating and generating interleukin 2 (IL-2), as well as expressing IL-2 receptors. This expansion and IL-2 production enable the growth on pony PBL in vitro.

Research Methodology and Findings

• The researchers stimulated pony peripheral blood lymphocytes (PBL) with a soluble fraction of Trypanosoma (T.) evansi (SF).
• They measured the proliferative response of the cells via 3H-thymidine incorporation, which is a common lab method for assessing cell proliferation.
• The stimulated cells were found to produce a substance with the same biological activities as interleukin-2 (IL-2). This concludes that the stimulated cells generated IL-2, an essential protein involved in immune response.
• They further discovered that the supernatants of these cells could support the in vitro growth of pony PBL when stimulated with concanavalin A (Con A-blasts), a plant lectin used to study and possibly trigger cell proliferation.
• The cells also continued to proliferate when incubated in short term cultures with SF, human recombinant IL-2 (hrIL-2), or both. They specifically bound radiolabelled hrIL-2 (125I-hrIL-2), indicating that the cells expressed IL-2 receptors (IL-2R).

Significance and Conclusion of the Research

• The study provides an insight into the immune responses of pony peripheral blood lymphocytes when exposed to a soluble fraction of the Trypanosoma evansi parasite, indicating an increased production of IL-2 and expression of IL-2 receptors.
• This research could have broader implications for understanding the immune response in equines and potentially other mammals, towards the Trypanosoma evansi infection and may help in the development of better therapeutic strategies.
• The data gathered here show that a soluble fraction of T. evansi stimulates the proliferation of pony PBL and leads to the production of IL-2 and the expression of IL-2R. These findings could be a significant step towards understanding the host immune response and designing more effective treatments against similar parasitic infections.