The mechanism of c-erbB-2 gene product increase in stomach cancer cell lines.
c-erbB-2 oncogene encodes a growth factor receptor whose amino acid sequence has extensive homology with human epidermal growth factor receptor. It is frequently overexpressed in human breast, ovary, lung, and stomach cancers, where its overexpression is related significantly to the prognosis. Tl investigate the possible role of c-erbB-2 oncogene in the oncogenesis of stomach cancer, we examined the genetic alterations of c-erbB-2 oncogene in 4 stomach cancer cell lines, SNU-1, SNU-5, SNU-16 and KATO III. There were no differences in c-erbB-2 mRNA level as well as c-erbB-2 gene copy number among them. But gp185-erbB-2, c-erbB-2 gene product, was increased from 2- to 4-fold in SNU-1 and SNU-5 cells, compared with that in SNU-16 or KATO III cells. Our results suggest that post-transcriptional regulation of gp185erbB-2 expression may underlie gp185erbB-2 overexpression in cancer cells.
Bae
C D
CD
Department of Biochemistry, Seoul National University College of Medicine, Korea.
Park
S E
SE
Seong
Y S
YS
Kimm
S W
SW
Park
J B
JB
Park
J B
JB
D000595:Amino Acid Sequence; D066246:ErbB Receptors / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D006801:Humans; D008969:Molecular Sequence Data; D011505:Protein-Tyrosine Kinases / Q000096:biosynthesis*; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D012333:RNA, Messenger / Q000032:analysis; D018719:Erb-b2 Receptor Tyrosine Kinases; D011956:Receptors, Cell Surface / Q000096:biosynthesis*; D013274:Stomach Neoplasms / Q000235:genetics / Q000378:metabolism*; D014407:Tumor Cells, Cultured
D066246:ErbB Receptors; D011505:Protein-Tyrosine Kinases; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D018719:Erb-b2 Receptor Tyrosine Kinases; D011956:Receptors, Cell Surface