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Morphometric analysis of intestinal mucosa. VI--Principles in enumerating intra-epithelial lymphocytes
Insights
Conventional counts of intra-epithelial lymphocytes (IEL) inaccurately overestimate local immune activity. Halving these counts provides accurate values for monitoring mucosal responses to antigenic challenge, crucial for conditions like celiac disease.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Intra-epithelial lymphocytes (IEL) are key in mucosal immune responses.
- Accurate IEL quantification is vital for assessing local immune activity.
Purpose of the Study:
- To expose the inaccuracy of conventional profile-density IEL counts.
- To establish precise morphometric analyses for IEL quantification.
Main Methods:
- Comparative analysis of conventional versus precise morphometric IEL counts.
- Log-transformed data analysis for disease-control and gluten-sensitive mucosae.
Main Results:
- Conventional IEL counts overestimate values by a factor of two.
- Established new ranges for disease-control (mean 11 IEL/100 enterocytes) and gluten-sensitive mucosae (mean 29 IEL/100 enterocytes).
Conclusions:
- Conventional IEL counting methods are unreliable.
- Halving conventional IEL counts provides accurate values for comparative studies and clinical monitoring.
Abstract:
The mucosal response by intra-epithelial lymphocytes (IEL) to antigenic challenge is a useful monitor of local immune activity. Conventional counts of IEL (determined as profile ratios of IEL to enterocyte nuclei) are inaccurate, and over-estimate values by a factor of two, both for disease-control mucosae and untreated 'flat' gluten-sensitized mucosae. Two further proofs are advanced in this paper which expose the inaccuracy of conventional profile-density IEL counts. New ranges (log-transformed data) indicate a disease-control mean of 11 IEL per 100 enterocytes (95% confidence limits 5-27) and 29 IEL per 100 enterocytes (95% confidence limits 14-61) for untreated flat gluten-sensitive mucosae. For simplicity, if conventional IEL "counts" are halved, correct values (based on precise morphometric analyses) are easily obtained for comparative and other purposes.