Investigation of the effect of black walnut extract on in vitro ion transport and structure of equine colonic mucosa.

This research explores the impact of black walnut extract on the intestinal health of horses, suggesting that it may cause inflammation and reduced resistance in the colonic mucosal epithelium.

Objective of the Research

• The key objective of this research was to investigate the effect of black walnut extract (BWE) on the secretory responses and structural makeup of the colonic mucosa in horses. It particularly aimed to determine whether BWE induces inflammation and negatively influences the mucosal barrier’s resilience.

Research Methodology

• The study involved 14 adult horses partitioned into two groups: Seven horses were given BWE intragastrically while the other seven served as controls.
• Over a span of 11 hours, the BWE-treated and control horses were closely observed.
• Tissue samples from the right ventral, left ventral, and right dorsal areas of the horses’ colons were gathered.
• These samples were subjected to microscopic examination to grade the degree of hemorrhage,
  edema (fluid buildup), and infiltration of granulocytic cells (neutrophils and eosinophils which are types of white blood cells).
• Colonic mucosal segments were incubated without or with flunixin meglumine (FLM), a type of nonsteroidal anti-inflammatory drug for 240 minutes. Spontaneous electrical potential difference and short-circuit current (Isc) were measured, and used to evaluate mucosal resistance.

Results of the Research

• Compared to the control group, horses treated with BWE exhibited an overall higher short-circuit current in their colonic tissues during the 240-minute incubation period.
• A decline in resistance was observed in the BWE-treated horses’ colonic tissues, highlighting a compromise in the mucosal barrier.
• On histological inspection, BWE-treated horses’ colonic mucosal tissues showed a higher degree of inflammation, edema, and damage as compared to control horses.

Conclusion

• The study concluded that BWE administration in horses seems to induce an inflammatory response in the colonic mucosal epithelium. This inflammation results in a compromise of the mucosal barrier, indicated by reduced mucosal resistance.
• The research also found that this response is not mediated by prostaglandin, a group of lipids that play a crucial role in controlling inflammation.