Hepatocyte Nuclear Factor 4, a Key Factor for Homeostasis, Cell Architecture, and Barrier Function of the Adult Intestinal Epithelium

Hepatocyte nuclear factor 4 (HNF-4) is a transcription factor which is highly expressed in the intestinal epithelium from duodenum to colon and from crypt to villus. The homeostasis of this constantly renewing epithelium relies on an integrated control of proliferation, differentiation, and apoptosis, as well as on the functional architecture of the epithelial cells. In order to determine the consequences of HNF-4 loss in the adult intestinal epithelium, we used a tamoxifen-inducible Cre-loxP system to inactivate the Hnf-4a gene. In the intestines of adult mice, loss of HNF-4 led to an increased proliferation in crypts and to an increased expression of several genes controlled by the Wnt/-catenin system. This control of the Wnt/-catenin signaling pathway by HNF-4 was confirmed in vitro. Cell lineage was affected, as indicated by an increased number of goblet cells and an impairment of enterocyte and enteroendocrine cell maturation. In the absence of HNF-4, cell-cell junctions were destabilized and paracellular intestinal permeability increased. Our results showe