Probing Short and Long Term Con­sequences of Small and Large Bowel Microbiota Transplants on Host Physiology: Implications for the Development of Future Live Biotherapeutics

This focused investigation looks into how microbial communities in distinct regions of the intestine influence host health and how region-specific microbiota transplants impact immune and metabolic function. The NIH-funded project examines both short- and long-term consequences of transplanting microbiota from small and large bowel regions, assessing whether current approaches like fecal microbiota transplant (FMT) sufficiently restore the small intestinal microbiome and what unintended host outcomes might follow. The research is motivated by an understanding that the small and large intestine harbor different bacterial communities with distinct roles in nutrient processing, immune modulation, and barrier function. Disruptions to these communities — whether from diet, antibiotics, or disease — are linked to a range of disorders, yet most microbiota-based therapies do not discriminate between intestinal regions.

This work aims to fill this critical knowledge gap by directly comparing the physiological effects of regional microbiota transplants on host systems, using experimental models to track alterations in microbial composition, host immune responses, and metabolic parameters over time. Central goals include determining whether small intestinal communities can be effectively restored by standard FMT approaches, identifying potential adverse consequences when regional microbiota are not appropriately matched, and defining mechanistic pathways by which region-specific microbes influence host physiology. The findings are intended to inform the development of next-generation live biotherapeutics that are tailored to the unique ecology of intestinal regions rather than relying on one-size-fits-all fecal material. Students from the Biomedical Sciences Program at Midwestern University’s Downers Grove campus participate in the research, gaining hands-on experience in microbiome science, immunology, and metabolic phenotyping.

This educational component reinforces the translational aims of the project by training the next generation of researchers in techniques and critical thinking necessary for therapeutic development. By linking microbial community dynamics to concrete host outcomes, the current research will help clarify the conditions under which microbiota transplantation is beneficial versus potentially harmful, and will outline strategies for designing live microbial therapeutics that restore region-specific functions. Expected impacts range from improved approaches to treating inflammatory bowel disease and metabolic disorders to establishing evidence-based guidelines for clinical microbiota interventions. Ultimately, the project seeks to advance a nuanced paradigm for microbiome therapeutics: one that recognizes intestinal regionality, leverages mechanistic insight, and prioritizes safety and efficacy in restoring host-microbe homeostasis.