Flow-mediated K(+) secretion in horses intoxicated with lolitrem B (perennial ryegrass staggers).

The research is about studying the impact of a toxin called lolitrem B on the secretion of potassium (K+) in horses. The experiment found that ingestion of this toxin could potentially interfere with aldosterone production and disrupt electrolyte balance in horses.

Research Methodology

• The study involved a step-by-step process where seven horses were initially fed non-perennial ryegrass feed for a week. After that, they were exposed to perennial ryegrass seed and hay containing an average of 2 parts per million (ppm) of lolitrem B.
• At the end of the control and treatment period, a drug named frusemide (1mg per kg intravenously (I/V)) was given to these horses.
• Scientists then measured and compared the fractional excretion of potassium (FEK+) and fractional excretion of sodium (FENa+).
• Furthermore, they also made comparative analysis of the concentration of aldosterone in plasma, serum potassium concentration, and feed potassium concentration between control and treatment group.

Key Findings

• One of the significant findings is that the change in FEK+ from the initial 0 minute to 15 minutes after frusemide administration notably reduced during the treatment period when compared to the control group.
• Another important finding is that the baseline concentration of aldosterone in plasma showed a reduction during the treatment period as opposed to the control period.
• Those primary findings were derived using the Wilcoxon signed-rank test, a non-parametric statistical test that compares two paired groups.

Conclusion

• The study concluded that intoxication of lolitrem B in horses might reduce the flow-mediated secretion of potassium and interfere with the production or secretion of aldosterone, a hormone that controls salt and water balance in the body.
• However, they also acknowledged that more extensive investigation is needed to confirm these findings and understand the underlying pathophysiology of this potential inhibition caused by lolitrem B.
• On a broader perspective, the results suggest that lolitrem B intoxication could disrupt the electrolyte balance in horses, besides causing neurological deficits.