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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Jpn+J+Cancer+Res
1991 ; 82
(11
): 1263-70
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gab.com Text
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Characterization of high-molecular-mass forms of basic fibroblast growth factor
produced by hepatocellular carcinoma cells: possible involvement of basic
fibroblast growth factor in hepatocarcinogenesis
#MMPMID1721615
Shimoyama Y
; Gotoh M
; Ino Y
; Sakamoto M
; Kato K
; Hirohashi S
Jpn J Cancer Res
1991[Nov]; 82
(11
): 1263-70
PMID1721615
show ga
Growth factor(s) with a strong mitogenic effect on BALB/c3T3 cells was purified
from an extract of C-Li21 cells, a human hepatocellular carcinoma line, by a
combination of heparin-affinity chromatography and reversed-phase
high-performance liquid chromatography (HPLC). Two major peaks of mitogenic
activity were obtained by reversed-phase HPLC. Sodium dodecyl
sulfate-polyacrylamide gel electrophoresis analysis of the two peaks revealed
that one was composed of three proteins with relative molecular masses of 27, 24
and 23 kilodaltons (kD), whereas the other was a single 19-kD protein. Immunoblot
analysis showed that all four of these molecules were immunoreactive species of
human basic fibroblast growth factor (bFGF). N-Terminal sequence analysis of
these molecules revealed that most of them were N-terminally blocked. However,
small proportions of the 23- and 19-kD molecules were not blocked, and their
respective N-terminal sequences were found to correspond to Gly-40-Gly-27 and
Pro29-Phe40 of human bFGF deduced from the cDNA sequence of a human hepatoma cell
line, SK-HEP-1. Expression of bFGF in hepatocellular carcinomas was then
investigated by RNA blot analysis. All of the examined hepatocellular carcinoma
cells expressed bFGF, and the degree of expression was higher in surgically
resected hepatocellular carcinomas than in the corresponding adjacent
non-cancerous liver tissue. Transcripts of bFGF were not detected in normal
liver. These results suggest that C-Li21 cells produce four molecular forms of
bFGF, and that bFGF may be involved in hepatocarcinogenesis. Moreover, it appears
that bFGF is a potent mitogen toward primary-cultured hepatocytes, and that
high-molecular-mass forms of bFGF produced by C-Li21 cells have stronger
mitogenic effects on hepatocytes and are more stable under acidic conditions than
the low-molecular-mass form, composed of 146 amino acids.