Mol. Cell. Biol., 09 1996, 5210-5218, Vol 16, No. 9
VV Ogryzko, TH Hirai, VR Russanova, DA Barbie and BH Howard
Human diploid fibroblasts (HDF) complete a limited number of cell divisions
before entering a growth arrest state that is termed replicative
senescence. Two histone deacetylase inhibitors, sodium butyrate and
trichostatin A, dramatically reduce the HDF proliferative life span in a
manner that is dependent on one or more cell doublings in the presence of
these agents. Cells arrested and subsequently released from histone
deacetylase inhibitors display markers of senescence and exhibit a
persistent G1 block but remain competent to initiate a round of DNA
synthesis in response to simian virus 40 T antigen. Average telomere length
in prematurely arrested cells is greater than in senescent cells,
reflecting a lower number of population doublings completed by the former.
Taken together, these results support the view that one component of HDF
senescence mimics a cell cycle-dependent drift in differentiation state and
that propagation of HDF in histone deacetylase inhibitors accentuates this
component.
Copyright © 1996, American Society for Microbiology
Human fibroblast commitment to a senescence-like state in response to histone deacetylase inhibitors is cell cycle dependent
Laboratory of Molecular Growth Regulation, National Institute of Child Health and Human Development, Bethesda, Maryland 20892-2753, USA.
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