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Mol. Cell. Biol., Mar 1997, 1224-1235, Vol 17, No. 3
M Shibanuma, E Mochizuki, R Maniwa, J Mashimo, N Nishiya, S Imai, T Takano, M Oshimura and K Nose
The hic-5 gene encodes a novel protein with Zn finger-like (LIM) motifs,
the expression of which increases during cellular senescence. The ectopic
expression of hic-5 in nontumorigenic immortalized human fibroblasts, whose
expression levels of hic-5 were significantly reduced in comparison with
those of mortal cells, decreased colony- forming efficiency. Stable clones
expressing high levels of hic-5 mRNA showed higher levels of mRNAs for
several extracellular matrix-related proteins, along with the alteration of
an alternative splicing as seen in senescent cells and decreased c-fos
inducibility. Furthermore, these clones acquired a senescence-like
phenotype, such as growth retardation; senescence-like morphology; and
increased expression of Cip1/WAF1/sdi1 after 20 to 40 population doublings.
On the other hand, antisense RNA expression of hic-5 in human normal
diploid fibroblasts delayed the senescence process. HIC-5 was localized in
nuclei and had affinity for DNA. Based on these observations, we speculated
that HIC-5 affected the expression of senescence-related genes through
interacting with DNA and thereby induced the senescence-like phenotypes. To
our knowledge, hic-5 is the first single gene that could induce senescence-
like phenotypes in a certain type of immortalized human cell and mediate
the normal process of senescence.
Copyright © 1997, American Society for Microbiology
Induction of senescence-like phenotypes by forced expression of hic-5, which encodes a novel LIM motif protein, in immortalized human fibroblasts
Department of Microbiology, Showa University School of Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan.
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