Early-Senescing Human Skin Fibroblasts Do Not Demonstrate Accelerated Telomere Shortening

Most normal mammalian cell lines demonstrate limited growth capacity due to the gradual accumulation of senescent cells in the culture. Senescent cells appear initially at a low incidence, but with increasing frequency as the culture accumulates more divisions. Because it has been suggested that sen...

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Published in:The journals of gerontology. Series A, Biological sciences and medical sciences Biological sciences and medical sciences, 2005-07, Vol.60 (7), p.820-829
Main Authors: Ferenac, Marina, Polančec, Denis, Huzak, Miljenko, Pereira-Smith, Olivia M., Rubelj, Ivica
Format: Article
Language:English
Subjects:
Aging
Antimetabolites - pharmacology
Blotting, Southern
Bromodeoxyuridine - pharmacology
Cell culture
Cell Division - drug effects
Cell Line
Cell Separation
Cells, Cultured
Cellular Senescence - physiology
Child
Chromosomes
Densitometry
DNA - analysis
Female
Fibroblasts - drug effects
Fibroblasts - metabolism
Fibroblasts - ultrastructure
Gerontology
Humans
In Vitro Techniques
Skin
Skin - cytology
Telomere - drug effects
Telomere - genetics
Telomere - metabolism
Telomere - ultrastructure
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Summary:Most normal mammalian cell lines demonstrate limited growth capacity due to the gradual accumulation of senescent cells in the culture. Senescent cells appear initially at a low incidence, but with increasing frequency as the culture accumulates more divisions. Because it has been suggested that senescence is regulated by telomere shortening in human cells, we compared the telomere lengths of the subpopulation of senescent cells, present in presenescent cultures, with those of young cells. Senescent cells were separated from young cycling cells by either bromodeoxyuridine (BrdU) incorporation followed by Hoechst dye and light treatment or DiI staining followed by separation on a high-speed cell sorter. Our results demonstrate that telomeres of early-senescing cells are the same length, and must shorten at the same rate, as cycling sister cells in the culture. Therefore, senescent cells in young mass cultures occur as a result of a stochastic, nontelomere-dependent process that we have described: sudden senescence syndrome.
ISSN:1079-5006
1758-535X
DOI:10.1093/gerona/60.7.820