Cloning and expression of the extra-cellular part of the alpha chain of the equine high-affinity IgE receptor and its use in the detection of IgE.

The study involves the cloning and expression of a specific aspect of the high-affinity IgE (Immunoglobulin E) receptor in horses, which is then used to detect equine IgE, aiding in the understanding of allergic reactions in these animals.

Objective of the Research

• The primary goal of this research was to clone and express the extra-cellular portion of the high-affinity IgE receptor (FcepsilonRI) alpha chain in horses and use this development to detect equine IgE. The researchers aimed to further our understanding of allergies and their consequences in horses, with a specific focus on Heaves, a chronic obstructive pulmonary disease found in this species.

Methodology and Techniques Used

• To achieve their goal, the researchers used both mammalian and insect cells to express the FcepsilonRI alpha subunit’s extra-cellular part, previously cloned and sequenced.
• The expression system involving insect cells and baculovirus was found to yield a higher amount of expressed protein.
• The researchers noted that the size of the recombinant proteins varied between the two systems, possibly because of the difference in the degree of glycosylation between them.

Findings and Conclusions

• One key finding of this study was that recombinant proteins from both cell systems bound with equine IgE in the bronchoalveolar lavage fluid from horses suffering from Heaves. This indicates that these expressed proteins were able to interact with the molecules.
• These results suggest that the extra-cellular part of the FcepsilonRI, once cloned and expressed, can prove to be a significant tool in studying equine IgE responses. It can help researchers gain more insights into how horses respond to allergens and how allergic reactions contribute to diseases like Heaves.