Post-transcriptional control of c-erb B-2 overexpression in stomach cancer cells
Experimental & Molecular Medicine
;
: 15-19, 2001.
Article
in English
| WPRIM
| ID: wpr-31948
ABSTRACT
The growth factor receptor oncogene, c-erb B-2, is frequently overexpressed in the adenocarcinomas of breast, ovary, lung and stomach. Although the mechanism of erb B-2 overexpression is thought as the result of transcriptional upregulation in many primary human carcinomas, expression rate of c-erb B-2 at mRNA level is usually lower than the level of translated protein. We also found that the expression of erb B-2 in SNU-1 stomach cancer cells was greater at post-transcription level (Bae et al., 1993). To explore the underlying mechanism of erb B-2 protein overexpression, we have chosen two cells lines, SNU-1 and SNU-16 where transcription rate of erb B-2 was closely resemble to each other while expressed protein levels were quite different. The synthesis rate of erb B-2 protein in SNU-1 cells was faster than SNU-16 cells while levels of erb B-2 mRNA were found to be similar in both cell lines. The half-life of the expressed erb B-2 protein was not significantly different in both cell lines. Analysis of the 5' untranslated region (UTR) of erb B-2 mRNA (-1approximately-323) showed no sequence abnormality in both cell lines. However, ribonuclease protection assay using cloned 5 UTR sequence revealed that the size of 5' UTR of erb B-2 mRNA which associate with transcription initiation site(s) in SNU-1 cells was longer than that in SNU-16. These results suggest that the increased erb B-2 protein synthesis rate possibly due to the redundant selection of transcription initiation might be a mechanism of erb B-2 overexpression in SNU-1 cells.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Stomach Neoplasms
/
Transcription, Genetic
/
Comparative Study
/
Molecular Sequence Data
/
Tumor Cells, Cultured
/
Base Sequence
/
Gene Expression Regulation, Neoplastic
/
Protein Processing, Post-Translational
/
Receptor, ErbB-2
/
5' Untranslated Regions
Limits:
Humans
Language:
English
Journal:
Experimental & Molecular Medicine
Year:
2001
Type:
Article
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