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A New Intraepithelial γδ T-Lymphocyte Marker for Celiac Disease Classification in Formalin-Fixed Paraffin-Embedded
Alina Popp1,2, Juha Taavela1, Paolo Graziano3
1Faculty of Medicine and Health Technology, Tampere University and Tampere University Hospital, Tampere, Finland.
Insights
A new immunohistochemistry (IHC) method accurately detects gamma-delta intraepithelial T-lymphocytes (γδ-IELs) in duodenal biopsies. This technique offers high sensitivity and specificity for diagnosing celiac disease (CD), improving upon existing methods.
Area of Science:
- Gastroenterology
- Immunology
- Histopathology
Background:
- Celiac disease (CD) diagnosis can be challenging with limited duodenal mucosal injury.
- Intraepithelial T-lymphocytes (IELs) indicate mucosal inflammation severity.
- Gamma-delta intraepithelial T-lymphocytes (γδ-IELs) are a specific CD marker, detectable via flow cytometry or frozen section immunohistochemistry (IHC).
Purpose of the Study:
- To develop and validate a novel IHC assay for quantifying γδ-IELs in formalin-fixed paraffin-embedded (FFPE) duodenal biopsies.
- To assess the diagnostic utility of this new IHC method for celiac disease.
Main Methods:
- Analyzed 138 duodenal biopsies using a standard IHC protocol with a new monoclonal antibody (H-41) targeting γδ-IELs.
- Quantified γδ-IEL density using digital image analysis.
- Compared results between newly diagnosed CD patients, CD patients on a gluten-free diet, and non-celiac controls.
Main Results:
- Significantly increased γδ-IEL density was observed in newly diagnosed CD patients compared to controls (p < 0.0001).
- The assay demonstrated high diagnostic accuracy, with a cutoff of 6.5 γδ-IELs/100 enterocytes achieving 96% sensitivity and 95% specificity for active CD.
- γδ-IEL density was higher in CD patients on a gluten-free diet than in controls, but lower than in newly diagnosed CD patients.
- The diagnostic performance of γδ-IELs surpassed that of CD3+ IELs and effectively distinguished CD from mimicking conditions.
Conclusions:
- Reliable staining and quantification of γδ-IELs in FFPE duodenal biopsies are achievable using the new IHC method.
- This assay exhibits excellent specificity and sensitivity for celiac disease diagnosis.
- The developed IHC method represents a promising advancement for routine histopathologic assessment of celiac disease.
Background:
The histopathologic diagnosis of celiac disease (CD) may be challenging when the duodenal biopsies mucosal injury is limited. Intraepithelial T-lymphocytes (IELs) can be useful to characterize the degree of mucosal inflammation. A small fraction of IELs expresses the γδ T-cell receptor (named γδ-IELs), whose density, determined by flow cytometry or frozen section immunohistochemistry (IHC), is a specific marker for CD.
Aim:
To establish a new IHC assay for γδ-IELs applicable to formalin-fixed paraffin-embedded (FFPE) duodenal biopsies.
Methods:
We analyzed γδ-IELs using IHC in 138 duodenal biopsies using a standard IHC staining protocol with a new monoclonal antibody H-41. IELs were quantitated with digital image analysis.
Results:
Compared to those in non-celiac controls (n = 51), γδ-IEL density was significantly increased in newly diagnosed celiac disease patients (n = 22, p < 0.0001). In ROC-curve analysis, the cutoff of 6.5 γδ-IELs/100 enterocytes distinguished optimally active CD patients from non-celiac controls (sensitivity 96%, specificity 95%). γδ-IEL density in CD patients on a gluten-free diet (n = 53) were also higher than in controls (p < 0.0001), but lower than those in newly diagnosed CD (p < 0.0001). The diagnostic value of γδ-IELs outperformed that of CD3 + IELs in both patient groups. γδ-IELs were better than CD3 + IELs distinguishing between celiac disease and conditions histologically mimicking celiac disease (n = 12).
Conclusions:
Intraepithelial γδ T-lymphocytes can be stained and quantitated reliably in FFPE duodenal biopsies. The results showed excellent specificity and sensitivity for celiac disease. The new IHC method of detection of γδ-IELs is a promising addition to the routine histopathologic assessment methodology of celiac disease.
