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Updated: May 15, 2026
Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
Published on: May 8, 2016
Comparison of lymphocyte isolation methods for endoscopic biopsy specimens from the colonic mucosa
Anna Carrasco1, Josep Mañe, Rebeca Santaolalla
1Department of Gastroenterology, Hospital Universitari Mútua de Terrassa, University of Barcelona, Research Foundation Mútua de Terrassa, Terrassa, Barcelona, Catalonia, Spain.
Insights
Optimizing immune cell isolation from small intestinal biopsies is crucial. Overnight enzymatic digestion yields the most lamina propria lymphocytes without altering their function, outperforming mechanical or culture methods.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Intestinal endoscopic biopsies offer disease stage insights but yield limited tissue.
- Optimizing immune cell isolation protocols is essential for these small samples.
- Current methods for colonic cell isolation from biopsies require thorough evaluation.
Purpose of the Study:
- To compare different methods for colonic epithelial and lamina propria cell isolation from biopsy specimens.
- To determine the optimal protocol for maximizing immune cell yield and preserving function.
- To evaluate mechanical, enzymatic, and organ culture techniques.
Main Methods:
- Two epithelial detachment protocols and five lamina propria cell isolation methods were tested.
- Immune cell yield, viability, and phenotype (CD45+, CD103+, CD3+, CD4+, CD8+, CD19+, CD16-56+) were assessed.
- Flow cytometry was used for cell analysis.
Main Results:
- Neither epithelial detachment method provided complete separation; ion chelation was more accurate.
- Overnight smooth enzymatic digestion yielded the highest number of lamina propria lymphocytes without phenotypic changes.
- High-dose collagenase significantly reduced CD4+ lymphocytes compared to low-dose enzymatic digestion (p=0.004).
- Mechanical and biopsy culture methods resulted in low cell yield and phenotypic alterations, respectively.
Conclusions:
- Overnight smooth enzymatic digestion is the preferred method for isolating lamina propria lymphocytes from colonic biopsies.
- Mechanical and biopsy culture methods are not recommended due to poor cell yield and alterations.
- Careful optimization of enzymatic digestion is key for reliable immune cell analysis in small intestinal biopsies.
Abstract:
An ideal method of immune cell isolation should provide maximum cell yield without disturbing functional properties. Intestinal endoscopic biopsies, in contrast to surgical samples, allow the study of all disease stages but have the drawback of a minimum amount of tissue available, making protocol optimization mandatory. We compared for the first time two methods of separation of colonic epithelium and five methods of lamina propria cell isolation for colonic biopsy specimens (mechanical, enzymatic and organ culture protocols). Lymphocyte number, viability and phenotype (CD45+, CD103+, CD3+, CD4+, CD8+, CD19+, CD16-56+) were analyzed by flow cytometry. Neither of the two epithelial detachment protocols achieved proper epithelial separation, though the high intensity ion chelation method was more accurate. Maximum cell yield of lamina propria lymphocytes without phenotypic modification was obtained with overnight smooth enzymatic digestion. High dose collagenase incubation caused a marked decrease in CD4+ lymphocytes of the lamina propria as compared to low enzymatic method (p=0.004). Mechanical and biopsy culture are not advisable methods because of the low cell yield, and phenotypic alterations and high contamination rate, respectively.
