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Mol. Cell. Biol., Apr 1997, 2014-2019, Vol 17, No. 4
I Garkavtsev and K Riabowol
Previous studies suggest that tumor suppressors may play significant roles
in blocking the growth of cells during cellular senescence. We therefore
studied the potential involvement of a novel growth inhibitor and candidate
tumor suppressor gene called ING1, which we have cloned recently (I.
Garkavtsev, A. Kazarov, A. Gudkov, and K. Riabowol, Nat. Genet. 14:415-420,
1996), in the process of cellular senescence. Our results show that the RNA
and protein levels of ING1 were 8- to 10-fold higher in senescent cells
than in young, proliferation-competent human diploid fibroblasts.
Expression of the nuclear p33ING1 protein was regulated during the cell
cycle, reaching maximal levels during DNA synthesis. Chronic expression of
antisense ING1 RNA reproducibly resulted in extension of the proliferative
life span of normal human fibroblasts by approximately seven population
doublings.
Copyright © 1997, American Society for Microbiology
Extension of the replicative life span of human diploid fibroblasts by inhibition of the p33ING1 candidate tumor suppressor
Department of Medical Biochemistry, University of Calgary, Alberta, Canada. igarkavt@acs.ucalgary.ca
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