Review Papers Against Their Own Results

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Core Findings and Evidence

Ogura et al. stained 55 ileal and colonic specimens from 21 Crohn's disease (CD) patients, 7 ulcerative colitis (UC) patients, and 5 non-IBD controls using a monoclonal antibody against NOD2 developed in-house. They found uniform NOD2 expression in terminal ileum Paneth cells and in metaplastic colonic Paneth cells across all groups, with cytosolic localization adjacent to antimicrobial peptide granules, and minimal expression in villous or colonic epithelium. Laser-capture (

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Updated: October 25, 2026

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Study Novelty

At publication (2003), connecting the newly discovered CD-risk gene NOD2 to Paneth cell biology was groundbreaking; it spawned the entire field of Paneth cell–microbiota research in ileal CD.

Scientific Quality

Robust descriptive immunohistochemistry with mRNA corroboration and appropriate multi-diagnosis controls; no blinding reported, antibody validated only in-house, and mechanistic claims exceed direct evidence.

Study Generality

Advances general understanding of innate immune sensing at mucosal surfaces beyond CD, though the dataset is tissue-localization specific.

Study Usefulness

Highly influential: redirected NOD2 research toward epithelial innate immunity and Paneth cell–microbiota interactions; the hypothesis was subsequently validated in knockout models.

Study Reproducibility

Methods (immunoperoxidase staining, crypt purification) are describable, but the in-house monoclonal antibody limits independent replication; no blinding or quantitative scoring reported.

Explanatory Depth

Provides a coherent positional mechanism for ileal specificity but not a complete causal chain; depth was realized only with later mouse-model work.