Abstract: Aleurone, a bioactive wheat bran component, has been shown to modulate host metabolism and gut microbiota, but its effects across different compartments of the equine gastrointestinal (GI) tract remain unclear. In this study, we aimed to characterize aleurone-derived metabolite profiles using an fermentation model with digesta from three equine GI compartments (jejunum, cecum, and colon). Unassigned: Three substrates (control feed, aleurone-containing feed, and pure aleurone) were fermented over 72 h, and targeted metabolomics was performed on 38 metabolites. Unassigned: Significant substrate- and compartment-dependent effects were found for 21 metabolites. Aleurone-containing feed increased asparagine and threonine levels while reducing lactic acid, particularly in the cecum. In contrast, control feed showed the highest overall metabolite abundance, suggesting greater microbial accessibility. Time-resolved analyses revealed dynamic production-utilization patterns; isoleucine, for example, displayed a distinct peak-decay pattern in the colon. Carnitine increased over time across compartments, showing local production, especially in the cecum. Artificial intelligence-based classification models achieved >90% accuracy in distinguishing substrate types and revealed ferulic acid and indole acetic acid as key differentiators. Unassigned: The findings suggest that aleurone's structural matrix may influence metabolite release and microbial access, highlighting its functional role in modulating fermentation and overall host metabolism. In this study, we demonstrate that aleurone alters microbial fermentation and metabolite output in a time- and compartment-specific manner. These insights enhance our understanding of aleurone as a functional feed component in horses and provide a foundation for future dietary strategies targeting metabolic and gut health.
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Overview
This research investigated how aleurone, a component of wheat bran, influences fermentation and metabolite production in different parts of the horse’s gut using an in vitro model.
The study examined metabolite changes over time in jejunum, cecum, and colon samples and assessed the effects of aleurone compared to control feed and pure aleurone.
Background and Objectives
Aleurone is a bioactive fraction of wheat bran known to affect host metabolism and gut microbial communities.
Its specific impact on the horse gastrointestinal (GI) tract, which has distinct compartments with unique microbial populations, was previously unclear.
The goal was to characterize the fermentation dynamics and metabolite profiles derived from aleurone in three different equine GI compartments: jejunum, cecum, and colon.
This was done using an in vitro fermentation model that mimics the digestion process in these gut regions.
Methods
Three substrates were tested in parallel fermentations:
Control feed (without aleurone)
Aleurone-containing feed
Pure aleurone supplement
Samples of digesta from the jejunum, cecum, and colon were collected and incubated with these substrates for up to 72 hours.
Metabolomic profiling targeted 38 specific metabolites related to microbial fermentation and host metabolism.
Sampling occurred over time to observe dynamic changes in metabolite levels.
Artificial intelligence (AI) classification models were applied to metabolite patterns to differentiate substrate types and highlight key metabolic markers.
Key Findings
Substrate and gut compartment significantly influenced metabolite profiles, with 21 out of 38 metabolites showing notable variation.
Aleurone-containing feed caused:
Increased levels of amino acids asparagine and threonine, especially in the cecum.
Decreased lactic acid concentrations in the cecum, suggesting altered fermentation pathways.
Control feed yielded the highest overall abundance of metabolites, indicating it may be more readily accessible to gut microbes than the aleurone matrix.
Time-course analysis revealed:
Metabolites like isoleucine exhibited a distinct peak followed by a decline, especially in the colon, reflecting dynamic microbial utilization and production.
Carnitine levels increased over time in all compartments, particularly in the cecum, implying local microbial synthesis or release.
AI classification achieved over 90% accuracy in distinguishing between substrates based on metabolite data.
Ferulic acid and indole acetic acid emerged as critical metabolite markers differentiating aleurone-containing substrates from controls.
Interpretation and Implications
The structural matrix of aleurone likely restricts some microbial access, affecting how metabolites are released and processed.
Aleurone modifies the fermentation process and metabolite profiles in a manner specific to gut location and time, demonstrating functional complexity.
The changes in key metabolites related to amino acids and organic acids suggest aleurone may influence gut microbial metabolism and, ultimately, host metabolic health.
Understanding these dynamics provides a scientific foundation for designing horse diets that use aleurone or similar wheat bran components to enhance gut health and metabolic function.
The study also highlights the utility of combining metabolomics with AI for advancing feed research and precision nutrition in equine science.
Conclusion
This study demonstrated that aleurone distinctly impacts microbial fermentation and metabolite production across different parts of the equine GI tract in vitro.
These findings offer novel insights into how aleurone can be leveraged as a functional dietary component to modulate gut microbial activity and host metabolism in horses.
Future work may build on these results to optimize feeding strategies to promote equine gut and metabolic health.
Cite This Article
APA
Boshuizen B, Willems M, De Maré L, Hosotani G, De Oliveira JE, Horemans B, Vidal Moreno De Vega C, Verdegaal EJMM, Delesalle C.
(2025).
From wheat bran to equine gut: the in vitro fermentation dynamics of aleurone.
Front Physiol, 16, 1644738.
https://doi.org/10.3389/fphys.2025.1644738
Department of Translational Physiology, Infectiology and Public Health, Research Group of Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Department of Translational Physiology, Infectiology and Public Health, Research Group of Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
De Maré, Lorie
Department of Translational Physiology, Infectiology and Public Health, Research Group of Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Hosotani, Guilherme
Cargill Research and Development Centre Europe, Vilvoorde, Belgium.
De Oliveira, Jean Eduardo
Cargill Research and Development Centre Europe, Vilvoorde, Belgium.
Horemans, Benjamin
Cargill Research and Development Centre Europe, Vilvoorde, Belgium.
Vidal Moreno De Vega, Carmen
Department of Translational Physiology, Infectiology and Public Health, Research Group of Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Verdegaal, Elisabeth-Lidwien J M M
Department of Translational Physiology, Infectiology and Public Health, Research Group of Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Equine Health and Performance Centre, School of Animal and Veterinary Sciences, Roseworthy Campus, University of Adelaide, Adelaide, SA, Australia.
Delesalle, Catherine
Department of Translational Physiology, Infectiology and Public Health, Research Group of Comparative Physiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Equine Health and Performance Centre, School of Animal and Veterinary Sciences, Roseworthy Campus, University of Adelaide, Adelaide, SA, Australia.
Conflict of Interest Statement
Authors GH, BH, and JD were employed by Cargill Research and Development Centre Europe. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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