# The Role of Fibroblast–Epithelial Cross-Talk on the Distribution of Distinct Fibroblast Phenotypes in the Intestinal Crypt

## TL;DR

This paper explores how fibroblast and epithelial cell interactions shape intestinal crypt structure and how fibroblast mutations might lead to colorectal cancer.

## Contribution

A mathematical model is introduced to explain how fibroblast-epithelial cross-talk creates distinct phenotypic zones in the intestinal crypt.

## Key findings

- The model predicts distinct zones of mutually supporting fibroblast and epithelial cell phenotypes in the crypt.
- Fibroblast mutations can disrupt these zones, leading to uncontrolled epithelial cell growth.
- Dysfunctional fibroblasts may contribute to the development of colorectal cancer.

## Abstract

Intestinal crypts are test tube-like structures lined with an epithelial monolayer. Under homeostasis, mitotic forces drive epithelial cells to migrate up the crypt, from the stem cell niche. As the cells migrate up the crypt, they differentiate into specialised cells. This process is regulated by morphogen gradients established by distinct populations of subepithelial fibroblasts, and recent studies suggest fibroblasts and epithelial cells have co-evolved to maintain crypt structure and function via complementary morphogen expression. We present a mathematical model of fibroblast–epithelial cross-talk, in which fibroblast and epithelial phenotypes emerge from morphogen binding to cell surface receptors. The model predicts the formation of distinct zones of mutually supporting phenotypes at different crypt heights. These findings support the idea that fibroblast and epithelial cell phenotypes are an emergent property of the crypt microenvironment. We use the model to investigate how mutations in the fibroblasts may disrupt these phenotypic zones. Our results suggest that such mutations may lead to uncontrolled epithelial cell growth and, as such, indicate how dysfunctional fibroblasts may contribute to the emergence of colorectal cancer.