NDLI: A novel mechanism of Ha-ras oncogene action: regulation of fibronectin mRNA levels by a nuclear posttranscriptional event.

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A novel mechanism of Ha-ras oncogene action: regulation of fibronectin mRNA levels by a nuclear posttranscriptional event.

Content Provider	PubMed Central
Author	Chandler, L. A. Ehretsmann, C. P. Bourgeois, S.
Abstract	Although loss of cell surface fibronectin (FN) is a hallmark of many oncogenically transformed cells, the mechanisms responsible for this phenomenon remain poorly understood. The present study utilized the nontumorigenic human osteosarcoma cell line TE-85 to investigate the effects of induced Ha-ras oncogene expression on FN biosynthesis. TE-85 cells were stably transfected with metallothionein-Ha-ras fusion genes, and the effects of metal-induced ras expression on FN biosynthesis were determined. Induction of the ras oncogene, but not proto-oncogene, was accompanied by a decrease in total FN mRNA and protein levels. Transfection experiments indicated that these oncogene effects were not due to reduced FN promoter activity, suggesting that a posttranscriptional mechanism was involved. The most common mechanism of posttranscriptional regulation affects cytoplasmic mRNA stability. However, in this study the down-regulation of FN was identified as a nuclear event. A component of the ras effect was due to a mechanism affecting accumulation of processed nuclear FN RNA. Mechanisms that would generate such an effect include altered RNA processing and altered stability of the processed message in the nucleus. There was no effect of ras on FN mRNA poly(A) tail length or site of polyadenylation. There was also no evidence for altered splicing at the ED-B domain of FN mRNA. This demonstration of nuclear posttranscriptional down-regulation of FN by the Ha-ras oncogene identifies a new level at which ras oncoproteins can regulate gene expression and thus contribute to development of the malignant phenotype.
Starting Page	3085
File Format	PDF
ISSN	10985549
e-ISSN	10985549
Journal	Molecular and Cellular Biology
Issue Number	5
Volume Number	14
Language	English
Publisher Date	1994-05-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology

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