Fecal extract from obese horses induces an inflammatory response by murine macrophages in vitro.

The research paper studies the differences in the gut microbiome of obese and non-obese horses and its correlation with inflammatory response. It suggests that the microbiome of obese horses can induce an increased inflammatory reaction (evident from higher levels of certain inflammatory markers), indicating a difference in microbial composition compared to non-obese horses.

Aim of the Study

• The main objective of the study was to compare the inflammatory response of mouse immune cells (macrophages) when exposed to the gut microbiome (represented by fecal matter) of obese and non-obese horses.

Methods

• Fecal samples were collected from 12 obese and 12 non-obese horses.
• A fecal supernatant was prepared from these samples, essentially acting as a representative extract of the microbiome present within the horses’ guts.
• Mouse macrophage cells were then exposed to this fecal extract
• The expression of inflammatory cytokines (interleukin-1β, tumor necrosis factor-α, and interleukin-6) and lipopolysaccharide concentration in the cells was assessed through real-time quantitative reverse transcription PCR assay and ELISA test.

Results

• The results revealed that fecal extracts from obese horses contained higher concentrations of a type of inflammatory molecule called lipopolysaccharide.
• Moreover, exposure to the microbiome of obese horses led to an increased expression of the proinflammatory cytokines interleukin-1β, tumor necrosis factor-α, and interleukin-6 in the macrophages.

Conclusions

• The elevated levels of inflammatory markers in macrophages exposed to the microbiome from obese horses suggest significant differences in the gut microbial composition in these horses compared to non-obese ones.
• This potentially implies that the gut microbiome might play a role in mediating an inflammatory response within the digestive tract of obese horses.
• The exact mechanisms of obesity in horses haven’t been completely explained, but understanding the disease’s pathophysiology will assist future research in developing diagnostic and therapeutic interventions for equine obesity.