Proteasome inhibitors shorten replicative life span and induce a senescent-like phenotype of human fibroblasts

The proteasome constitutes the main non‐lysosomal cellular protease activity, and plays a crucial role not only in the disposal of unwanted material, but also in the regulation of numerous cellular processes. Previously, we have reported that during the replicative senescence of WI‐38 fibroblasts th...

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Bibliographic Details
Published in:Journal of cellular physiology 2006-06, Vol.207 (3), p.845-853
Main Authors: Torres, Claudio, Lewis, Lindsey, Cristofalo, Vincent J.
Format: Article
Language:English
Subjects:
Biomarkers
Cell Line
Cell Proliferation - drug effects
Cellular Senescence - drug effects
Fibroblasts
Gene Expression Regulation - drug effects
Humans
Hydrolysis
Peptides - metabolism
Phenotype
Protease Inhibitors - pharmacology
Proteasome Endopeptidase Complex - metabolism
Proteasome Inhibitors
Substrate Specificity
Titrimetry
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Summary:The proteasome constitutes the main non‐lysosomal cellular protease activity, and plays a crucial role not only in the disposal of unwanted material, but also in the regulation of numerous cellular processes. Previously, we have reported that during the replicative senescence of WI‐38 fibroblasts there is a significant impairment in proteasome activity, which probably has important implications in the control of MAPK signaling and cellular proliferation. In this study, we report the potential role of the proteasome in the generation of the senescent phenotype in WI‐38 fibroblasts. Our results indicate that inhibition of proteasome activity leads to an impairment in cell proliferation, and a shortening of the life span. The results also indicate that inhibition of the proteasome in young cells induces a premature senescent‐like phenotype, as indicated by the increase in senescence‐associated β‐galactosidase (SA β‐gal) activity and the abundance of both p21 and collagenase mRNAs, as well as a decreased level of EPC‐1 mRNA known markers of cellular senescence, not previously shown to depend on proteasome activity. Together, our results suggest a molecular mechanism for the lack of responsiveness of human cells to growth factors, and point towards a role for the proteasome in the control of the life span of both cells and organisms. J. Cell. Physiol. © 2006 Wiley‐Liss, Inc.
ISSN:0021-9541
1097-4652
DOI:10.1002/jcp.20630