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Type: Journal article
Title: Growth-regulatory activity of the growth specific arrest-specific gene, GAS1, in NIH3T3 fibroblasts
Author: Evdokiou, A.
Cowled, P.
Citation: Experimental Cell Research, 1998; 240(2):359-367
Issue Date: 1998
ISSN: 0014-4827
Abstract: The growth arrest-specific gene, Gas-1, is preferentially expressed in quiescent NIH3T3 cells and inhibits DNA synthesis, suggesting that Gas-1 may be a tumor suppressor gene. When GAS1 cDNA, under the control of the strong constitutive CMV promoter, was transfected into NIH3T3 cells, no stable transfectant cell lines were produced, confirming that high levels of expression of GAS1 mRNA inhibit proliferation. GAS1, under the control of a dexamethasone-inducible promoter, was also transfected into NIH3T3 cells, resulting in normal numbers of transfectant clones. When expression of GAS1 mRNA was induced with dexamethasone, the growth rate was greatly inhibited. Morphological changes characteristic of growth arrest were also observed. To determine if antisense inhibition of expression of Gas-1 will transform normal fibroblasts, GAS1 cDNA, cloned in the antisense orientation, was transfected into NIH3T3 cells and expression of endogenous Gas-1 mRNA was inhibited. The GAS1-antisense cells had altered morphology and grew to a much higher saturation density than control cell lines with a loss of contact inhibition. However, there was no change in requirements for serum or any development of anchorage-independence. Antisense inhibition of expression of GAS1 is therefore insufficient to transform the cells, suggesting that additional genetic events are required for a fully malignant phenotype.
Keywords: 3T3 Cells
Growth Inhibitors
Cell Cycle Proteins
Membrane Proteins
Cell Division
GPI-Linked Proteins
DOI: 10.1006/excr.1998.4011
Appears in Collections:Aurora harvest 2
Surgery publications

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