Proximal Colon Microbiota
Proximal Colon Microbiota - Related Videos
04:00
Generation of Mouse Proximal Colon Loop Model: A Surgical Procedure to Generate Proximal Colon Loop and Measure Intestinal Permeability by Detection of Fluorescent Markers in Serum Following Intraluminal Injection
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2025
In this video, we describe a surgical procedure to generate mouse proximal colon loop or pcLoop segment followed by intraluminal injection of fluorescent markers into the segment to study the intestinal epithelial permeability.
04:09
An Ex Vivo Gut Organ Culture System to Study Host-Microbiota Interactions
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2025
In this video, we describe the methodology for setting up an ex vivo gut organ culture system to study the interactions between mouse intestinal tissue fragments and specific gut bacteria. The device consists of two pairs of input-output ports, the first connecting the intestinal tissue lumen and supplying the specific bacterial suspension into it, and the second continuously supplying media to the device's wells to maintain ex vivo tissue viability.
02:12
In Vitro Batch-Culture Model to Mimic Colonic Fermentation by Human Gut Microbiota
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2025
Source: Ahmadi, S., et al. An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota. J. Vis. Exp. (2019).This video demonstrates a method for modeling gut microbial fermentation by incubating fecal samples with dietary fermentable fiber under anaerobic conditions to study metabolite production by gut microbiota.
01:27
Oral Infection Alters the Gut Microbiota in a Rat Model
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2026
Begin with a rat model with sutures tied around its upper molar teeth to support bacterial colonization.Repeatedly smear the sutures with a gum disease-causing oral pathogenic bacterium using a gel-like solution.The bacteria colonize the gum around the sutures.Colonization triggers inflammation and damages the tissues.The bacteria release toxins that diffuse through damaged tissues and enter the bloodstream.These circulating toxins reach the gut, cause inflammation, disrupt the epithelial...
03:33
Evaluating the Effects of Fecal Microbiota Transplantation in an Interleukin-10 Deficient Mouse
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2025
This video demonstrates a procedure of fecal microbiota transplantation in an interleukin-10 deficient mouse with colon inflammation. Colonized fecal microbes in the gut release secondary metabolites, eliciting anti-inflammatory cytokine release and reducing colon inflammation.
FAQs
Within the oxygen-limited proximal colon, bacteria ferment undigested carbohydrates and other intestinal contents. This microbial metabolism produces short-chain fatty acids, which represent measurable chemical outputs of community activity. Examining these products helps connect the material entering the colon with downstream effects on intestinal biology, including nutrient processing and interactions at the mucosal surface.
Short-chain fatty acids provide an indicator of what microbial communities are doing metabolically, rather than showing composition alone. Measuring these fermentation products can help researchers relate bacterial processing to intestinal biology and assess whether changes in community activity accompany altered epithelial function or host-microbe interactions.
Microbial activity in the proximal colon occurs in contact with the mucosal environment and can interact with the host immune system. These interactions provide a biological link between resident microorganisms and intestinal function. Studying them helps clarify how microbial communities may participate in epithelial responses and broader host-microbe relationships.
Diet and other interventions can be investigated by examining whether they alter the composition of proximal colon communities or their metabolic outputs. Changes in fermentation products may reveal functional effects that are not apparent from community composition alone. This approach supports comparisons of how interventions relate to nutrient processing, epithelial function, or gastrointestinal biology.
Characterization focuses on two complementary dimensions: which microorganisms are present and what metabolic products they generate. Community composition describes the biological members, while fermentation outputs, including short-chain fatty acids, indicate activity. Considering both dimensions gives researchers a more informative view of proximal colon function than either composition or metabolites alone.
Research on these communities can connect microbial composition and metabolism with gastrointestinal health or disease mechanisms. Investigators can examine whether changes in the proximal colon coincide with altered nutrient processing, epithelial function, or immune interactions. The same framework also supports studying responses to diet and other interventions in a biologically relevant intestinal setting.