Abstract
Background: A defining characteristic of the human intestinal epithelium is that it is the most rapidly renewing tissue in the body. However, the processes underlying tissue renewal and the mechanisms that govern their coordination have proved difficult to study in the human gut.
Objective: To investigate the regulation of stem cell-driven tissue renewal by canonical Wnt and TGFβ/bone morphogenetic protein (BMP) pathways in the native human colonic epithelium.
Design: Intact human colonic crypts were isolated from mucosal tissue samples and placed into 3D culture conditions optimised for steady-state tissue renewal. High affinity mRNA in situ hybridisation and immunohistochemistry were complemented by functional genomic and bioimaging techniques. The effects of signalling pathway modulators on the status of intestinal stem cell biology, crypt cell proliferation, migration, differentiation and shedding were determined.
Results: Native human colonic crypts exhibited distinct activation profiles for canonical Wnt, TGFβ and BMP pathways. A population of intestinal LGR5/OLFM4-positive stem/progenitor cells were interspersed between goblet-like cells within the crypt-base. Exogenous and crypt cell-autonomous canonical Wnt signals supported homeostatic intestinal stem/progenitor cell proliferation and were antagonised by TGFβ or BMP pathway activation. Reduced Wnt stimulation impeded crypt cell proliferation, but crypt cell migration and shedding from the crypt surface were unaffected and resulted in diminished crypts.
Conclusions: Steady-state tissue renewal in the native human colonic epithelium is dependent on canonical Wnt signals combined with suppressed TGFβ/BMP pathways. Stem/progenitor cell proliferation is uncoupled from crypt cell migration and shedding, and is required to constantly replenish the crypt cell population.
Objective: To investigate the regulation of stem cell-driven tissue renewal by canonical Wnt and TGFβ/bone morphogenetic protein (BMP) pathways in the native human colonic epithelium.
Design: Intact human colonic crypts were isolated from mucosal tissue samples and placed into 3D culture conditions optimised for steady-state tissue renewal. High affinity mRNA in situ hybridisation and immunohistochemistry were complemented by functional genomic and bioimaging techniques. The effects of signalling pathway modulators on the status of intestinal stem cell biology, crypt cell proliferation, migration, differentiation and shedding were determined.
Results: Native human colonic crypts exhibited distinct activation profiles for canonical Wnt, TGFβ and BMP pathways. A population of intestinal LGR5/OLFM4-positive stem/progenitor cells were interspersed between goblet-like cells within the crypt-base. Exogenous and crypt cell-autonomous canonical Wnt signals supported homeostatic intestinal stem/progenitor cell proliferation and were antagonised by TGFβ or BMP pathway activation. Reduced Wnt stimulation impeded crypt cell proliferation, but crypt cell migration and shedding from the crypt surface were unaffected and resulted in diminished crypts.
Conclusions: Steady-state tissue renewal in the native human colonic epithelium is dependent on canonical Wnt signals combined with suppressed TGFβ/BMP pathways. Stem/progenitor cell proliferation is uncoupled from crypt cell migration and shedding, and is required to constantly replenish the crypt cell population.
| Original language | English |
|---|---|
| Pages (from-to) | 610-621 |
| Number of pages | 12 |
| Journal | Gut |
| Volume | 63 |
| Issue number | 4 |
| Early online date | 5 Jul 2013 |
| DOIs | |
| Publication status | Published - Apr 2014 |
Keywords
- Adult
- Aged
- Aged, 80 and over
- Bone Morphogenetic Proteins
- Cell Differentiation
- Cell Movement
- Cell Proliferation
- Colon
- Humans
- In Situ Hybridization
- Intestinal Mucosa
- Microscopy, Confocal
- Middle Aged
- Regeneration
- Signal Transduction
- Stem Cells
- Transforming Growth Factor beta
- Wnt Signaling Pathway
Profiles
-
Andrea Münsterberg
- School of Biological Sciences - Professor of Developmental Biology
- Cells and Tissues - Member
Person: Research Group Member, Academic, Teaching and Research
-
Anastasia Sobolewski
- School of Chemistry, Pharmacy and Pharmacology - Lecturer in Pharmacology
- Pharmacology and Biological Chemistry - Member
Person: Research Group Member, Academic, Teaching and Research
-
Mark Williams
- School of Biological Sciences - Associate Professor
- Norwich Institute for Healthy Aging - Member
Person: Research Centre Member, Academic, Teaching and Research
Projects
- 2 Finished
-
Epigenetic modulation of Wnt signalling in the ageing human intestinal epithelium: consequences to tissue
Williams, M. (Principal Investigator)
Biotechnology and Biological Sciences Research Council
1/10/08 → 30/09/11
Project: Research
-
Functional analysis of integrated Wnt signals for self-renewal of the human colonic epithelium
Williams, M. (Principal Investigator) & Münsterberg, A. (Co-Investigator)
Biotechnology and Biological Sciences Research Council
1/12/06 → 31/12/09
Project: Research
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