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From the Department of Vascular Biology,*
Holland
Laboratory, American Red Cross, Rockville, Maryland; the Department of
Biochemistry and Molecular Biology and the Institute for Biomedical
Sciences,§
George Washington University Medical
Center, Washington, D.C.; the Laboratory of Experimental
Carcinogenesis,
Division of Basic Sciences,
National Cancer Institute, Bethesda, Maryland; and the Human Genetics
Program,
Fox Chase Cancer Center,
Philadelphia, Pennsylvania
Polypeptide growth factors stimulate mammalian cell proliferation
by binding to specific cell surface receptors. This interaction
triggers numerous biochemical responses including the activation of
protein phosphorylation cascades and the enhanced expression of
specific genes. We have identified several fibroblast growth factor
(FGF)-inducible genes in murine NIH 3T3 cells and recently reported
that one of them, the FGF-inducible 14 (Fn14) immediate-early
response gene, is predicted to encode a novel, cell
surface-localized type Ia transmembrane protein. Here, we
report that the human Fn14 homolog is located on chromosome 16p13.3 and
encodes a 129-amino acid protein with ~82% sequence identity to the
murine protein. The human Fn14 gene, like the murine Fn14
gene, is expressed at elevated levels after FGF, calf
serum or phorbol ester treatment of fibroblasts in vitro
and is expressed at relatively high levels in heart and kidney
in vivo. We also report that the human Fn14 gene is
expressed at relatively low levels in normal liver tissue but at high
levels in liver cancer cell lines and in hepatocellular carcinoma
specimens. Furthermore, the murine Fn14 gene is rapidly induced
during liver regeneration in vivo and is expressed at
high levels in the hepatocellular carcinoma nodules that develop in the
c-myc/transforming growth factor-
-driven and the
hepatitis B virus X protein-driven transgenic mouse models of
hepatocarcinogenesis. These results indicate that Fn14 may play a role
in hepatocyte growth control and liver neoplasia.
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