Briefly explain how probiotic Lactobacillus rhamnosus colonizes the human gut and its impact on the host's immune response.
Answer
By adhering to intestinal mucosa via surface adhesins, L. rhamnosus competes with pathogens, produces antimicrobial peptides, and modulates gut‑associated lymphoid tissue to enhance secretory IgA and downregulate pro‑inflammatory cytokines.
Step-by-step solution
- L. rhamnosus expresses surface proteins that allow it to stick to the intestinal mucosa.
- The adherent cells outcompete potential pathogens for adhesion sites.
- They secrete bacteriocins and other antimicrobial compounds that inhibit pathogen growth.
- L. rhamnosus stimulates gut‑associated lymphoid tissue, increasing IgA secretion and reducing pro‑inflammatory cytokine production.
Common mistake: Over‑emphasizing only competitive exclusion while ignoring the immunomodulatory role
Concept tested: Probiotic colonization and immune modulation
Published · How this solution was prepared and checked
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