Colonic nutritional and physicochemical parameters drive gut microbiota dysbiosis in obesity: what we learned from the Ob-M-ARCOL model development.
This study highlights how dietary and physicochemical factors can alter gut microbiota in obesity, suggesting potential avenues for further research in microbiome restoration.
Where it sits
this study against the rest of the efsubaglutide corpusSummary and findings
This study developed and validated an in vitro colonic model to investigate gut microbiota dysbiosis in obesity. The model was based on human in vivo data and analyzed fecal microbiota from healthy (n=4) and obese (n=5) donors. Results indicated that applying obese parameters to healthy samples significantly reduced microbial α-diversity.
Abstract
<h4>Background</h4>Obesity has reached epidemic proportions worldwide with a substantial burden on both individual health and society. Alterations in gut microbiota are increasingly recognized as a key contributor in disease pathogenesis. However, mechanistic understanding at the ecosystem level remains limited. In line with EU and US regulations, <i>in vitro</i> gut systems can be useful to address these questions, but up to now, there is no validated <i>in vitro</i> model of the obese human colon.<h4>Results</h4>To address this gap, we performed dietary surveys and conducted an extensive analysis of 250 articles to set-up and validate a unique <i>in vitro</i> colonic model, based on human <i>in vivo</i> data and reproducing obese-specific nutritional, physicochemical, and lumen <i>vs</i> mucus-associated microbial parameters. Then, in an original experimental set-up, we cross-compared data on gut microbiota structure and activities during fermentations performed with fecal microbiota from healthy (<i>n</i> = 4) or obese (<i>n</i> = 5) donors and operated under healthy or newly designed obese parameters. Interestingly, applying obese parameters on healthy fecal samples resulted in a significant reduction in microbial <i>α</i>-diversity and in taxa associated with health (e.g., <i>Akkermanciaceae</i>, <i>Rikenellaceae,</i> and Archaea), together with a tendency toward increased production of short-chain fatty acids and associated energy, in full agreement with <i>in vivo</i> data. Conversely, applying healthy parameters on obese fecal samples led to gut microbiota resilience.<h4>Conclusions</h4>These findings highlight the importance of nutritional and physicochemical environment in shaping colonic bacterial and archaeal populations in obesity. This innovative validated model represents a robust and useful platform for mechanistic investigations on gut microbiome in the absence of the host cells, as well as for preclinical evaluation of food and pharmaceutical strategies aiming to restore microbiota eubiosis in a personalized manner.
Background
This paper addresses the role of gut microbiota in obesity, a condition with significant health implications. Prior research has indicated that alterations in gut microbiota contribute to obesity, but mechanistic insights at the ecosystem level are limited. The development of a validated in vitro model of the obese human colon is crucial for understanding these dynamics and exploring potential interventions.
Methods
The study involved dietary surveys and an analysis of 250 articles to establish an in vitro colonic model. Fecal microbiota from healthy (n=4) and obese (n=5) donors were compared under conditions mimicking healthy and obese states. The primary outcome measures included gut microbiota structure and activities during fermentations.
Results
The application of obese parameters to healthy fecal samples resulted in a significant reduction in microbial α-diversity. Specific taxa associated with health were also reduced, while there was a tendency for increased production of short-chain fatty acids. The model demonstrated resilience in gut microbiota when healthy parameters were applied to obese samples.
Interpretation
These findings align with existing literature on the impact of diet on gut microbiota. While the statistical significance of the results is noted, the clinical relevance remains uncertain due to the small sample sizes and the in vitro nature of the study. The model's limitations, including the absence of host cells, may confound the applicability of the findings to real-world scenarios.
Key findings
- Significant reduction in microbial α-diversity when applying obese parameters on healthy fecal samples.
- Taxa associated with health, such as Akkermanciaceae and Rikenellaceae, were reduced under obese parameters.
- Tendency toward increased production of short-chain fatty acids was observed.
- Gut microbiota resilience was noted when healthy parameters were applied to obese fecal samples.
Limitations
- Small sample sizes (n=4 healthy, n=5 obese).
- In vitro model may not fully replicate in vivo conditions.
- No long-term follow-up data reported.
- Findings may not be generalizable beyond the studied population.