Cellular senescence in vitro and organismal ageing

Leiden Repository

Cellular senescence in vitro and organismal ageing

Type: Doctoral Thesis
Title: Cellular senescence in vitro and organismal ageing
Author: Maier, Andrea Britta
Publisher: Department of Gerontology and Geriatrics, Faculty of Medicine / Leiden University Medical Center (LUMC), Leiden University
Issue Date: 2008-12-11
Keywords: Ageing
Biomarker
Fibroblast
Hayflick-limit
Oncogene
Satellite cell
Senescence
Abstract: Replicative ageing of fibroblasts has often been used as a model for organismal ageing. The general assumption that the ageing process is mirrored by cellular senescence in vitro is based on lower replicative capacity of human fibroblasts from donors of higher chronological age, but these inverse relations have not been reported unequivocally. The relation between chronological age and fibroblast growth characteristics was assessed in nonagenarian subjects of the Leiden 85+ Study. A high remaining replicative capacity impressively showed that even in the very elderly a crucial number of cells with high mitotic capacity are left to give rise to fibroblast strains with the capacity for more than 100 population doublings. During the course of fibroblast growth in vitro, beta-galactosidase activity has been shown to be a reliable biomarker for replicative senescence. In myoblast cultures the relation between mixed cultures and clonal cultures was studied, showing marked heterogeneity between clonal cultures that all had a significantly lower replicative capacity when compared to mixed cultures, indicating heterogeneity of cells within one tissue compartment in their in vivo history. In a formal review on the replicative capacity of fibroblasts from patients suffering from accelerated ageing syndromes, age related diseases and donor age it was found that except for premature ageing syndromes, the replicative capacity of fibroblasts in vitro does not mirror key characteristics of human life histories.
Description: Promotor: R.G.J. Westendorp, Co-promotor: D. van Heemst
With summary in Dutch
Faculty: LUMC
Citation: Maier, A.B., 2008, Doctoral thesis, Leiden University
ISBN: 9789090237312
Handle: http://hdl.handle.net/1887/13335
 

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