Gut-associated lymphoid tissues (GALTs) comprise key intestinal immune inductive sites, including the Peyer’s patches of the small intestine and different types of isolated lymphoid follicle (ILF) found along the length of the gut. Our understanding of human GALT is limited due to a lack of protocols for their isolation. Here we describe a technique that, uniquely among intestinal cell isolation protocols, allows identification and isolation of all human GALT, as well as GALT-free intestinal lamina propria (LP). The technique involves the mechanical separation of intestinal mucosa from the submucosa, allowing the identification and isolation of submucosal ILF (SM-ILF), LP-embedded mucosal ILF (M-ILF) and LP free of contaminating lymphoid tissue. Individual SM-ILF, M-ILF and Peyer’s patch follicles can be subsequently digested for downstream cellular and molecular characterization. The technique, which takes 4–10 h, will be useful for researchers interested in intestinal immune development and function in health and disease.
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We thank all patients and collaborating staff at Herlev hospital and, in particular, the Gastroenterology Team (Department of Pathology) for help in providing tissue samples. We thank A. Mowat (Glasgow University) for valuable feedback during preparation of the manuscript and J. Vandamme for video editing assistance. This work was supported by grants from the Lundbeck Foundation (R155-2014-4184), Denmark, the Gut Cell Atlas, an initiative funded by the Leona M. and Harry B. Helmsley Charitable Trust, US, the Swedish Research Council (2017-02072) and the Swedish Cancerfonden (18 0598) to W.W.A.
The authors declare no competing interests.
Peer review information Nature Protocols thanks the anonymous reviewers for their contribution to the peer review of this work.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Key reference using this protocol
Fenton, T. M. et al. Immunity 17, 557–570.e6 (2020): https://doi.org/10.1016/j.immuni.2020.02.001
a, Representative image of proximal colonic submucosa after peeling (Step 7) showing SM-ILF (indicated with arrows). Scale bar, 5 mm. b, Immunofluorescence image of a colonic SM-ILF isolated at Step 8. αSMA, alpha smooth muscle actin (green); CD45 (white). Results are from one representative sample of three. c, Diameter (mm) of all colonic SM-ILFs, colonic M-ILFs (cM-ILFs) and ileal M-ILFs (iM-ILFs) detectable in quantified pictures, with bars representing the mean diameter, and each dot representing a single ILF. SM-ILFs were from a total of 68 patients, cM-ILFs from 21 patients, and iM-ILFs from 14 patients. Representative immunofluorescence images of (d-f) peeled LP from proximal colon after Step 7. CD45 (green); DAPI (blue); CD3 (white); CD19 (red). Pictures are representative of three independent samples of which a total 33.9 mm² LP was imaged. Scale bar, 150 µm (a,b) and 1 mm (d–f); triangles indicate the possition of a T cell cluster in (d–f). See supplementary information and source data table for experimental details. GALT, gut-associated lymphoid tissue. LP, lamina propria. M-ILF, mucosal isolated lymphoid follicle. SM-ILF, submucosal isolated follicle.
Gating strategy for identifying indicated innate immune subsets in Fig. 3 from GALT-free proximal colon lamina propria (cLP) and colonic submucosal isolated lymphoid follicles (SM-ILF). Green gate, mast cells. Blue gate, granulocytes. Red gate, innate lymphoid cells type-3 (ILC3). Orange gate, dendritic cells (DCs). Purple gate, monocytes/macrophages (Mo/Mac). Histograms showing RORγt staining ILC3 (red) and cells stained with an isotype control (grey). See supplementary information for experimental details. MB, methylene blue.
Extended Data Fig. 3 Biopsy peeling and impact of methylene blue (MB) counterstaining on flow cytometric analysis.
a, Picture taken upon aquisition (Step 1) showing the basal side of two colonic biopsies with visible submucosa (SM), (left) with and (right) without an associated isolated lymphoid follicle (arrow head). b, Picture taken during the peeling process (Step 7) showing the basal side of a colonic biopsy with the SM and associated isolated lymphoid follicle (arrow head) partialy peeled off. c, Histogram showing MB staining intensity in the APC (670/30 nm filter) channel for unstained (grey filled) SM-ILF cells and cells stained with 0.1% (black solid line) or 1.5% MB (dashed line). d, Flow cytomety plot of SM-ILF cells showing non-specific staining of live cells with 0.1% MB in the APC and Alexa flour 700 (730/45 nm filter) channels excited by a red laser (640 nm). Example gate given for MB+ cells. Scale bar, 1 mm. See supplementary information for details.
a, Luminal side of PP (outlined) with satellite follicle clusters (arrowhead). (b) and (c) Immunofluorescence images of PP follicles disrupting the muscularis mucosa. αSMA, alpha smooth muscle actin (green); EpCAM, epithelial cell adhesion molecule (red); CD45 (white). d, Complete PP (outlined) with the SM facing up (basal side). e, PP with the SM facing down (luminal side) and associated black spots surrounding individual follicles (arrows). f, PP (outlined) with the SM facing up (basal side) and associated black spots surrounding individual follicles (arrows). (a, d–f) Scale bar, 5 mm. (b,c) Scale bar, 150 µm.
Image of the basal side of proximal colon tissue after submucosal trimming (Step 5) showing examples of visible GALT (arrows). Holes in the tissue produced by cutting are indicated by arrowheads. Scale bar, 1 mm. GALT, gut-associated lymphoid tissue.
Representative immunofluorescence images of (a) ileum and (b) colonic tissue after Step 2, (c) ileum and (d) colonic lamina propria after Step 7, (e) ileum and (f) colonic submucosa after Step 7, and (g) ileum and (h) colonic M-ILF isolated at Step 13. αSMA, alpha smooth muscle actin (green); EpCAM, epithelial cell adhesion molecule (red); CD45 (white). Pictures are representative of 3 independent samples. Scale bar, 150 µm; (*) indicates the presence of a M-ILF in (a, g and h). See supplementary information for experimental details.
Image of distal colon after peeling (Step 7) showing examples of M-ILF (arrows) and a “crater” (arrowhead) left behind by a peeled submucosal isolated lymphoid follicle. Scale bar, 1 mm. M-ILF, mucosal isolated lymphoid follicle.
Supplementary Table 1, Supplementary Video Legends 1–8 and Supplementary Methods.
Turning over full-thickness colon and ileum wall at Step 1, showing the basal and luminal side of each tissue.
Cutting off fat, serosa and muscularis externa (Step 2) of colon.
Trimming submucosa (Step 5) of colon.
Initiation and peeling (Step 7) of colon.
Initiation and peeling (Step 7) of ileum.
Excision of methylene blue stained submucosal isolated lymphoid follicles from the peeled submucosa using a tissue punch (Step 12).
Identification of a submucosal isolated lymphoid follicle from the basal side, and its association with a mucosal invagination on the luminal side, before the initiation of peeling (Step 6).
Excision of mucosal isolated lymphoid follicles from peeled sigmoid colon lamina propria using a scalpel (Step 12).
Patient-specific viability counts (in %) as well as exact cell-counts of given cell types from given tissues.
Patient-specific proportions (% of total CD45+ cells) of given cell types from given tissues.
Patient-specific mean diameter and mean concentration of submucosal isolated lymphoid follicles.
Patient-specific follicle count and size.
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Jørgensen, P.B., Fenton, T.M., Mörbe, U.M. et al. Identification, isolation and analysis of human gut-associated lymphoid tissues. Nat Protoc 16, 2051–2067 (2021). https://doi.org/10.1038/s41596-020-00482-1
Mucosal Immunology (2021)