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Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine
Published on: May 21, 2012
Distribution of human colonic dendritic cells and macrophages
P Pavli1, L Maxwell, E Van de Pol
1Division of Clinical Sciences, John Curtin School of Medical Research, Australia.
Insights
Intestinal macrophages form a barrier beneath the epithelium, while dendritic cells form a network throughout the lamina propria. This distinct distribution suggests macrophages act as the first line of defense against gut antigens.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Intestinal immune responses rely on the interplay between dendritic cells and macrophages.
- Understanding the distinct roles and locations of these cells is crucial for comprehending gut immunity.
Purpose of the Study:
- To define the phenotype and anatomical distribution of intestinal dendritic cells and macrophages.
- To elucidate their potential roles in intestinal immune surveillance.
Main Methods:
- Isolation of lamina propria cell suspensions from resected colonic specimens.
- Phenotypic analysis using immunocytochemistry and immunoelectron microscopy.
- Determination of anatomical distribution via immunohistochemistry with single- and double-labeling techniques.
Main Results:
- Dendritic cells expressed HLA-DR, HLA-DQ, and CD68, with weak/absent S100 staining.
- Macrophages expressed HLA-DR, HLA-DQ, CD68, and 25F9, with absent CD14 in noninflamed tissues.
- Macrophages (25F9+) were concentrated beneath the epithelium; dendritic cells (S100+/HLA-DR+) formed a network throughout the lamina propria.
Conclusions:
- Intestinal macrophages may act as a primary defense barrier against luminal antigens.
- Dendritic cells likely recruit T cell responses upon antigen breach of the macrophage barrier.
- Distinct localization and phenotype suggest specialized functions in intestinal immune regulation.
Abstract:
To define the phenotype of intestinal dendritic cells and macrophages, resected colonic specimens were used to obtain lamina propria cell suspensions by EDTA treatment, then enzymatic digestion. The phenotype of dendritic cell-enriched suspensions was compared with that of macrophage-enriched populations by immunocytochemistry using the avidin-biotin-peroxidase (ABC) system and immunoelectron microscopy. Dendritic cells expressed HLA-DR (L243) and HLA-DQ-associated (RFD) antigens and CD68 in a perinuclear distribution. Staining for S100 was weak or absent. Macrophages also expressed HLA markers (L243 and RFD1) and CD68. The 25F9 antigen was expressed strongly, whilst CD14 was absent from cells isolated from noninflamed tissues. To determine their anatomic distribution, immunohistochemistry was performed using single- and double-labelling techniques (ABC +or- alkaline phosphatase anti-alkaline phosphatase method). Mutually exclusive subsets of 25F9+ and S100+ cells were seen: 25F9+ macrophages were concentrated in a band immediately beneath the luminal epithelium; S100+/HLA-DR+ dendritic cells formed a reticular network throughout the lamina propria and beneath the basement membrane of the crypts. This distribution suggests that macrophages may help regulate intestinal responses by acting as the first line of defence against the entry of luminal antigens. A breach of the macrophage 'barrier' by invading antigens may necessitate the recruitment of T cell responses by immunostimulatory dendritic cells.
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