Microfold Cells and MAP: Insights from Systematic Review
A systematic review found that Mycobacterium avium subspecies paratuberculosis (MAP) may play a role in Crohn's disease. However, links to multiple sclerosis, type 1 diabetes, and amyotrophic lateral sclerosis were noted as associative only, with no proven causation. MAP is capable of invading intestinal microfold cells, suggesting a potential mechanism for its persistence in the body.
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Why it matters
Understanding the association between MAP and these diseases could reveal insights into their pathogenic mechanisms, though it does not establish a direct cause.
What this does not prove
Key limitations include the inability of PCR to differentiate between live and dead organisms, complicating investigations into MAP's roles in these diseases.
Next milestone
No next milestone was established from the available source.
Study facts
- Study design
- Systematic review
- Participants / samples
- Not reported
- Randomised
- Not reported
- Controlled
- Not reported
- Primary endpoint met
- Not reported
- Relevant MS type
- Not reported
- Publication date
- 2026-09-15
- Evidence reviewed
- Abstract only
- Regulatory approval
- Not reported
- Research areas
- Not classified
Original sources
- Primary evidenceMultistage pathogenesis and disease associations of Mycobacterium avium subsp. paratuberculosis. ↗DOI: 10.3389/fimmu.2026.1948490
Supporting passages (6)
study designThis narrative review synthesizes MAP environmental distribution, strain genotyping, transmission routes, and multistage pathogenic mechanisms.
findingsCumulative epidemiological and molecular evidence implies MAP may contribute to Crohn's disease (CD), whereas its links to multiple sclerosis (MS), type 1 diabetes mellitus (T1DM), and amyotrophic lateral sclerosis (ALS) remain associative without proven causality.
findingsCumulative epidemiological and molecular evidence implies MAP may contribute to Crohn's disease (CD), whereas its links to multiple sclerosis (MS), type 1 diabetes mellitus (T1DM), and amyotrophic lateral sclerosis (ALS) remain associative without proven causality.
findingsMAP breaches the intestinal barrier via fibronectin attachment protein (FAP)-mediated invasion of microfold cells and establishes intracellular persistence within macrophages.
limitationsWe also critically assess diagnostic limitations-particularly the inability of polymerase chain reaction (PCR) to distinguish viable from non-viable organisms-and highlight major research challenges, including extrapolation of virulence mechanisms from other mycobacterial species.
publication datePublication date: 2026-09-15
AI assessment, not yet reviewed by a person · version 1 · Community votes are separate from evidence review.