Correlation between monoclonal antibody reactivity and expression of CD4 and CD8 alpha genes in the horse.

This study investigates the correlation between the reaction of monoclonal antibodies and the expression of the CD4 and CD8 alpha genes in horses. By applying specific antibodies, the researchers were able to enrich samples with cells that express these genes. They then used these cells to extract RNA, which was analyzed to determine gene expression levels. The findings suggest that the CD4 and CD8 alpha genes in horses are more closely related to human genes, than mouse genes.

Objectives of the Research

The study aimed to:

• Determine the relationship between the reactivity of monoclonal antibodies and the expression of the CD4 and CD8 alpha genes in horses.
• Investigate the degree of relation between horse and human genes compared to horse and mouse genes.
• Confirm the allocation of CD4 and CD8 specificities to the cellar antibodies used in the study.

Methodology

To achieve these goals, the research was conducted as follows:

• The researchers gathered peripheral blood lymphocytes (PBL) from horses and used a mix of antibodies to isolate cells that potentially expressed CD4 and CD8 protein molecules.
• RNA was extracted from the CD4 and CD8 enriched cells, as well as PBL and from neonatal equine thymus.
• The RNA of equine granulocytes and kidney cells was also obtained as a negative control.
• The extracted RNA was then subjected to gel electrophoresis and transferred to nylon membranes.
• Northern blots were then hybridized using human and mouse cDNA probes for CD4 and CD8 alpha. The response of the probes was then analyzed to assess gene expression.

Findings

After the above steps, the researchers found that:

• The human CD4 probe detected a specific RNA transcript in equine PBL, CD4 enriched lymphocytes, and thymocytes.
• The human CD8 alpha probe detected a similar RNA transcript in RNA extracted from equine CD8 alpha enriched lymphocytes and thymocytes.
• The mouse cDNA probes for CD4 and CD8 did not react with equine RNA, suggesting a closer relation with the human genes.
• The hybridization results with the human probes support the allocation of the CD4 and CD8 specificities to the antibodies used in the study. Thus, confirming that these antibodies accurately target their respective protein molecules in horses.
• Based on the findings, the researchers surmise that the equine CD4 and CD8 alpha genes are more closely related to their human counterparts than to the murine (mouse) versions.