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Mol. Cell. Biol., 03 1997, 1626-1641, Vol 17, No. 3
H Ye, TF Kelly, U Samadani, L Lim, S Rubio, DG Overdier, KA Roebuck and RH Costa
The hepatocyte nuclear factor 3alpha (HNF-3alpha) and 3beta proteins have
homology in the winged helix/fork head DNA binding domain and regulate
cell-specific transcription in hepatocytes and in respiratory and
intestinal epithelia. In this study, we describe two novel isoforms of the
winged helix transcription factor family, HNF-3/fork head homolog 11A
(HFH-11A) and HFH-11B, isolated from the human colon carcinoma HT-29 cell
line. We show that these isoforms arise via differential splicing and are
expressed in a number of epithelial cell lines derived from tumors (HT-29,
Caco-2, HepG2, HeLa, A549, and H441). We demonstrate that differentiation
of Caco-2 cells toward the enterocyte lineage results in decreased HFH-11
expression and reciprocal increases in HNF-3alpha and HNF-3beta mRNA
levels. In situ hybridization of 16 day postcoitus mouse embryos
demonstrates that HFH- 11 expression is found in the mesenchymal and
epithelial cells of the liver, lung, intestine, renal cortex, and urinary
tract. Although HFH- 11 exhibits a wide cellular expression pattern in the
embryo, its adult expression pattern is restricted to epithelial cells of
Lieberkuhn's crypts of the intestine, the spermatocytes and spermatids of
the testis, and the thymus and colon. HFH-11 expression is absent in adult
hepatocytes, but its expression is reactivated in proliferating hepatocytes
at 4, 24, and 48 h after partial hepatectomy. Consistent with these
findings, we demonstrate that HFH-11 mRNA levels are stimulated by
intratracheal administration of keratinocyte growth factor in adult lung
and its expression in an adult endothelial cell line is reactivated in
response to oxidative stress. These experiments show that the HFH-11
transcription factor is expressed in embryonic mesenchymal and epithelial
cells and its expression is reactivated in these adult cell types by
proliferative signals or oxidative stress.
Copyright © 1997, American Society for Microbiology
Hepatocyte nuclear factor 3/fork head homolog 11 is expressed in proliferating epithelial and mesenchymal cells of embryonic and adult tissues
Department of Biochemistry, University of Illinois at Chicago, 60612- 7334, USA.
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