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- W1605389780 abstract "Previously, we identified an amplified gene in a stomach cancer cell line, KATO-III, and designated it K-sam. This gene was later found to be identical with a gene for a receptor tyrosine kinase, bek/FGFR2. One of the characteristics of the K-sam gene is structural diversity of its transcripts; K-sam complementary DNA (cDNA) cloned from human brain (K-sam-I) has a completely different sequence at the third extracellular immunoglobulin-like domain as compared to that of the K-sam cDNA derived from KATO-III cells (K-sam-II). Recent study has revealed that this difference signifies a differential ligand affinity; the receptor encoded by the K-sam-I cDNA has a high affinity for basic fibroblast growth factor (bFGF), while the K-sam-II cDNA corresponds to a receptor with the high affinity for keratinocyte growth factor (KGF). Reverse transcription-polymerase chain reaction and RNA blot analysis showed that the K-sam-II-type transcript was present in carcinoma cell lines but not in any of the sarcoma cell lines examined. The K-sam-I-type transcript was expressed in both carcinoma and sarcoma cell lines. Furthermore, KGF enhanced the DNA synthesis of the esophageal cancer cells, TE-1, in a dose-dependent manner, while the effect of bFGF was not substantial. In contrast, the glioblastoma cell line, A-172, that expressed the bFGF receptor showed a mitogenic response to bFGF but not to KGF. These data suggest that KGF is a growth factor used preferentially in cancer cells, and this preference is based on the presence of the K-sam-II-type receptor in carcinoma cells but not in sarcoma cells due to alternative splicing." @default.
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- W1605389780 date "1994-01-15" @default.
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- W1605389780 title "Preferential expression of the third immunoglobulin-like domain of K-sam product provides keratinocyte growth factor-dependent growth in carcinoma cell lines." @default.
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