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Orientador(es)
Resumo(s)
Background: There are now several lines of evidence to suggest that protein synthesis and translation factors are involved in the regulation of cell proliferation and cancer development. Aims: To investigate gene expression patterns of eukaryotic releasing factor 3 (eRF3) in gastric cancer. Methods: RNA was prepared from 25 gastric tumour biopsies and adjacent non-neoplastic mucosa. Real time TaqMan reverse transcription polymerase chain reaction (RT-PCR) was performed to measure the relative gene expression levels. DNA was isolated from tumour and normal tissues and gene dosage was
determined by a quantitative real time PCR using SYBR Green dye. Results: Different histological types of gastric tumours were analysed and nine of the 25 tumours revealed
eRF3/GSPT1 overexpression; moreover, eight of the 12 intestinal type carcinomas analysed overexpressed the gene, whereas eRF3/GSPT1 was overexpressed in only one of the 10 diffuse type carcinomas (Kruskal-Wallis Test; p , 0.05). No correlation was found between ploidy and transcript expression levels of eRF3/GSPT1. Overexpression of eRF3/GSPT1 was not associated with increased translation rates because the upregulation of eRF3/GSPT1 did not correlate with increased eRF1 levels. Conclusions: Overexpression of eRF3/GSPT1 in intestinal type gastric tumours may lead to an increase in the translation efficiency of specific oncogenic transcripts. Alternatively, eRF3/GSPT1 may be involved in
tumorigenesis as a result of its non-translational roles, namely (dis)regulating the cell cycle, apoptosis, or
transcription.
Descrição
Palavras-chave
DNA, Neoplasm/genetics Gene dosage Neoplasm proteins/genetics Neoplasm proteins/metabolism Peptide termination factors/genetics Peptide termination factors/metabolism RNA, Neoplasm/genetics Reverse Transcriptase Polymerase Chain Reaction/methods Stomach neoplasms Up-regulation
Contexto Educativo
Citação
Malta-Vacas J, Aires C, Costa P, Conde AR, Ramos S, Martins AP, Monteiro C, Brito M. Differential expression of the eukaryotic release factor 3 (eRF3/GSPT1) according to gastric cancer histological types. J Clin Pathol. 2005 Jun;58(6):621-5.