Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine (original) (raw)
Summary
Here, we detail a methodology for the rapid isolation of mouse intestinal dendritic cells (DCs) and macrophages. Phenotypic characterization of intestinal DCs and macrophages is performed using multi-color flow cytometric analysis while magnetic bead enrichment followed by cell sorting is used to yield highly pure populations for functional studies.
Abstract
Within the intestine reside unique populations of innate and adaptive immune cells that are involved in promoting tolerance towards commensal flora and food antigens while concomitantly remaining poised to mount inflammatory responses toward invasive pathogens1,2. Antigen presenting cells, particularly DCs and macrophages, play critical roles in maintaining intestinal immune homeostasis via their ability to sense and appropriately respond to the microbiota3-14. Efficient isolation of intestinal DCs and macrophages is a critical step in characterizing the phenotype and function of these cells. While many effective methods of isolating intestinal immune cells, including DCs and macrophages, have been described6,10,15-24, many rely upon long digestions times that may negatively influence cell surface antigen expression, cell viability, and/or cell yield. Here, we detail a methodology for the rapid isolation of large numbers of viable, intestinal DCs and macrophages. Phenotypic characterization of intestinal DCs and macrophages is carried out by directly staining isolated intestinal cells with specific fluorescence-labeled monoclonal antibodies for multi-color flow cytometric analysis. Furthermore, highly pure DC and macrophage populations are isolated for functional studies utilizing CD11c and CD11b magnetic-activated cell sorting beads followed by cell sorting.
Protocol
1. Dissection and Dissociation of Intestinal Epithelial Cells
Preparation of reagents and equipment:
- Warm Ca2+/Mg2+-free PBS (CMF PBS) to room temperature.
- Warm Ca2+/Mg2+-free HBSS with 5% FBS (CMF HBSS/FBS) and 2mM EDTA to room temperature.
- Warm Orbital shaker to 37 °C.
Note: Steps 1.1 to 1.7 must be performed as quickly as possible to minimize the extent of cell death and to achieve maximum cell yield.
- Euthanize mice in a CO2 chamber and spray 70% ethanol onto the abdomen and thorax. ....
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Discussion
Figure 3. Factors important for the optimization of cell yield and surface antigen expression. Cell yield and surface antigen expression are directly affected by the duration of tissue digestion, the specific characteristics of the collagenase, the degree of tissue mincing, and the presence .......
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Disclosures
No conflicts of interest declared.
Acknowledgements
We thank Aaron Rae (Emory University Department of Pediatrics and Children's Healthcare of Atlanta Flow Core) for cell sorting. This work was supported by NIH grant AA01787001, a Career Development Award from the Crohn's and Colitis Foundation of America, and an Emory-Egleston Children's Research Center seed grant to T.L.D.
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Materials
List of materials used in this article
| Name | Company | Catalog Number | Comments |
|---|---|---|---|
| 1X PBS, Ca2+- and Mg2+-free | |||
| Hank's balanced salt solution (HBSS) with phenol red | Fisher Scientific | SH3001603 | |
| Sodium bicarbonate | Sigma-Aldrich | S6014 | |
| 1M HEPES in 0.85% NaCl | Lonza Inc. | 17-737E | |
| Fetal bovine serum (FBS) | Atlanta Biologicals | S11150H | Heat-inactivated |
| 0.5M EDTA (pH 8.0) | Cellgro | 46-034-CI | |
| Collagenase type VIII | Sigma-Aldrich | C2139 | |
| DNase I | Roche Group | 14785000 | Stock solution: 100mg/ml |
| LIVE/DEAD Fixable Aqua Dead Cell Stain Kit for 405 nm excitation | Invitrogen | L34957 | Use at 1:1000 |
| CD45-PerCP mAb (30F11) | BD Biosciences | 557235 | Use at 1:100 |
| CD103-PE mAb (M290) | BD Biosciences | 557495 | Use at 1:100 |
| FcγRIII/II mAb (2.4G2) | BD Biosciences | 553141 | Use at 1:200 |
| CD11c-APC mAb (N418) | eBioscience | 17-0114-82 | Use at 1:100 |
| MHC-II (I-Ab)-Alexa Fluor 700 mAb | eBioscience | 56-5321-82 | Use at 1:100 |
| CD11b-eFluor 450 mAb (M1/70) | eBioscience | 48-0112-82 | Use at 1:200 |
| F4/80-PE-Cy7 mAb (BM8) | eBioscience | 25-4801-82 | |
| CD11b microbeads | Miltenyi Biotec | 130-049-601 | |
| CD11c microbeads | Miltenyi Biotec | 130-052-001 | |
| 50 mL conical tubes | BD Biosciences | 352098 | |
| Single mesh wire strainer | Chefmate | ||
| Small weigh boat | Fisher Scientific | 08-732-116 | |
| 100 μm cell strainer | BD Biosciences | 352360 | |
| 40 μm cell strainer | BD Biosciences | 352340 | |
| 5 mL polystyrene round-bottom tubes | BD Biosciences | 352235 | Use at 1:100 |
| MaxQ 4450 benchtop orbital shaker | Thermo Fisher Scientific, Inc. | ||
| LS MACS column | Miltenyi Biotec | 130-042-401 | |
| LSR II | BD Biosciences | ||
| FACSAria II | BD Biosciences |
References
- Maloy, K. J., Powrie, F. Intestinal homeostasis and its breakdown in inflammatory bowel disease. Nature. 474, 298-306 (2011).
- Nagler-Anderson, C., Terhoust, C., Bhan, A. K., Podolsky, D. K. Mucosal antigen presentation and the control of tolerance and immunity. Trends Immu....
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