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Geographic variations in eosinophil concentration in normal colonic mucosa
R R Pascal1, T L Gramlich, K M Parker
1Department of Pathology, Emory University School of Medicine, Atlanta, Georgia, USA.
Summary
Geographic location significantly impacts eosinophil counts in normal colon tissue. Southern US regions show higher eosinophil levels compared to other areas, suggesting environmental or dietary factors.
Area of Science:
- Gastroenterology
- Immunology
- Pathology
Background:
- Eosinophils are immune cells found in various tissues, including the colon.
- Elevated eosinophils in the colon can indicate inflammatory conditions like eosinophilic esophagitis or colitis.
- Understanding normal eosinophil distribution is crucial for accurate diagnosis.
Purpose of the Study:
- To investigate geographic variations in eosinophil concentrations within normal colonic mucosa in the United States.
- To establish baseline eosinophil levels in different regions to aid in diagnosing colonic eosinophilia.
Main Methods:
- Review of 256 normal colonic mucosal biopsy specimens from surgical pathology departments across the US.
- Exclusion of specimens with any signs of colitis, adenomatous changes, or eosinophil invasion into crypts or muscularis mucosae.
- Quantification of eosinophils per intercryptal space in the descending and sigmoid colon.
Main Results:
- Significant geographic variation in mean eosinophil counts was observed across the United States.
- The Southern US exhibited the highest mean eosinophil concentrations in normal colonic mucosa.
- A 35-fold difference in mean eosinophil levels was found between patients in New Orleans and Boston.
Conclusions:
- Normal colonic mucosal eosinophil concentrations vary geographically within the US.
- Environmental or dietary factors may contribute to these observed regional differences.
- Regional baseline data are essential for interpreting colonic biopsy specimens for eosinophilia.