Fecal microbiota transplants (FMT) have long been considered a potential treatment for a range of conditions, including inflammatory bowel diseases, obesity, type 2 diabetes, and even autism. However, a recent study from the University of Chicago has raised concerns about the unintended health consequences that FMT could have on recipients in the long term.
The research, published in the journal Cell, found that FMT can lead to regional microbiota mismatches in the gut ecosystem when anaerobic microbes from the colon are transferred to other parts of the digestive system. These mismatches can have lasting effects on the recipient’s metabolism, behavior, and energy balance.
Lead author of the study, Orlando (Landon) DeLeon, Ph.D., emphasized the importance of matching regional microbiota to their proper environments to ensure better overall health benefits. The study demonstrated that anaerobic microbes from the colon not only colonized the small bowel after a single transplant but also persisted there for months, altering their new intestinal environments to their advantage.
The researchers conducted experiments with mice and studied human tissue samples to observe the effects of FMT on different parts of the intestine. They found that even a single transplant could create regional gut mismatches that persisted for up to three months, leading to changes in metabolite production, liver metabolism, immune function, and eating behaviors in the recipients.
The study advocates for a more cautious approach to FMT, suggesting the use of “omni-microbial transplants” (OMT) instead. OMT would involve transferring microbes from all different regions of the intestine, not just those from the colon, to ensure a more natural settlement of microbes in the gut.
Dr. Eugene B. Chang, senior author of the study, highlighted the need for a deeper understanding of how different microbes exert their influence in different parts of the intestine. This knowledge could help restore normal gut function and improve the application of microbial transplants to fulfill their significant promise.
Overall, the research underscores the importance of considering the long-term consequences of FMT and the need for more targeted approaches to microbiota transplantation. By better matching regional microbiota and understanding the interactions between different types of microbes in the gut, researchers hope to optimize the effectiveness of microbial transplants for various health conditions.
