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BRS5-FM3-PM7 — Vagal / ENS Signalling Modulation​

Stage 2B draft — not approved. Independent Stage 2A/2B review. Canonical science, mappings and review status are unchanged.

1. Mission & Overview​

Mission​

Maintain gut-to-brain nerve signalling through the vagus nerve and enteric nervous system.

Intervention Dominance: Diet-Supported — Dietary Requirements

Overview​

Specialised gut cells and nerves relay information from the intestinal contents to the brain. Experimental work identifies a fast glutamate-mediated connection to the vagus nerve. One exact bacterial strain also produced vagus-dependent responses in mice, but its human trial did not reproduce the proposed stress or cognitive benefits. These are different routes and different endpoints. [1]

  • Benefits: Gut sensory signals help the brain respond to internal conditions. Experimental nerve communication does not establish a general mood or attention benefit from probiotic or dietary intake.
  • Implementation Notes: The precise JB-1 strain and glucose sensory stimulus provide defined experimental examples. They are not recommendations to increase sugar intake or substitute generic fermented foods.
  • Biological Relevance: Nutrient sensing, microbial signalling and clinical electrical vagus stimulation are separate exposures. Regional receptor mRNA, vagal activity and human symptoms are different measurements.

2. Primary Biological Effects​

  • Lactobacillus rhamnosus JB-1 produced vagus-dependent responses in mice; its human trial did not establish stress or cognitive benefit. [1]
  • Mouse enteroendocrine cells connect to vagal neurons and use glutamate for rapid nutrient signals. [6]

3. Intervention Levers​

4. Mechanistic Basis​

Summary​

Lactobacillus rhamnosus JB-1 produced vagus-dependent responses in mice; its human trial did not establish stress or cognitive benefit. [1]

Biological process​

Retain exact strain-specific preclinical modulation without treating it as a universal nutritional requirement. [1]

Mechanism Boundary​

Nutrient sensing, microbial signalling and clinical electrical vagus stimulation are separate exposures. Regional receptor mRNA, vagal activity and human symptoms are different measurements.

Integration​

This PM contributes its specific process to its parent FM. Shared inputs do not merge distinct jobs or prove an integrated clinical outcome.

4.1 Scientific Findings​

Summary​

Direct neural-circuit experiments establish nutrient sensory transduction. JB-1 has vagotomy-sensitive mouse findings alongside a null human stress/cognition trial. Other probiotic symptom studies do not identify the same vagal route. [1] [5] [6]

5. BRS Pathways and Connections​

5.1 BRS Pathways​

No newly adjudicated pathway is added by this preview.

5.2 Cross-BRS Mechanism Relationships​

Existing connected mechanisms remain candidates in the review history; no new downstream admission is inferred.

5.3 Local BRS Mechanism Relationships​

7. Phenome Connections​

No new phenome rating or outcome admission is made in this unapproved draft. Inherited candidate relationships are preserved in the assessment record; microbial, cellular and animal findings do not automatically establish a human cognitive effect.

8. References​