Association of increased autophagic inclusions labeled for β-galactosidase with fibroblastic aging
Abstract
Replicative senescence appears after a finite number of cell divisions. After proliferation has ceased, senescent cells remain viable for long periods and metabolic modifications are observed such as lipofuscin accumulation. In order to understand this phenomenon, we examined the emergence of subcellular modifications corresponding to autophagy in MRC5 normal human fibroblasts. An increase of monodansylcadaverine fluorescence, a specific marker of autophagy, in aging compared to young fibroblasts was observed (p<0.0001). The increase of autophagic vacuoles in aging fibroblasts was confirmed by electron microscopy. We compared young versus senescent fibroblasts and showed that autophagic vacuoles, already present in young cells, became larger in senescent fibroblasts with a significant relative increase of inclusion area with respect to measured cell area (p=0.0041). However, autophagy-associated-gene expression remained stable in senescent compared to young fibroblasts, suggesting that the autophagy process per se is not enhanced. In parallel, transmission electron microscopy analysis showed that beta-galactosidase activity distribution was modified by aging: beta-galactosidase (an enzyme linked to lysosome) was scattered in young fibroblasts, but clustered at the level of autophagic vacuoles in senescent fibroblasts, suggesting a predominance of autolysosomes at this stage. These results support the hypothesis that, during fibroblast aging, the increase of autophagic vacuoles, as well as that of beta-galactosidase activity, may be associated to an increase of lysosomal mass and to an accumulation of degradative autolysosomes with lipofuscin. This phenomenon could be involved in the death of senescent fibroblasts.
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Increasing data indicate a significant association between senescence and autophagy in various cell systems.
“Increasing data indicate a significant association between senescence and autophagy in various cell systems (Gerland et al. 2003; Gamerdinger et al. 2009; Sasaki et al. 2010; Capparelli et al. 2012; Dörr et al. 2013).”
From Cellular senescence and its effector programs (2014) · cites this paper as Gerland et al. 2003
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- Authors
- Gerland, L.-M., Peyrol, S., Lallemand, C., Branche, R., Magaud, J.-P., & Ffrench, M.
- Affiliations
- Inserm (FR)
- Corresponding author
- Ffrench, Martine
- Venue
- Experimental Gerontology
- Publisher
- Elsevier BV
- Published
- 2003-08
- Volume
- 38
- Issue
- 8
- Pages
- 887-895
- ISSN
- 0531-5565 (ISSN-L)
- OpenAlex
- W2071942085
- Cited by
- 130
- References
- 2
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 6 · 2023: 4 · 2022: 4 · 2021: 6 · 2020: 9 · 2019: 8 · 2018: 5 · 2017: 3 · 2016: 9 · 2015: 3 · 2014: 8 · 2013: 7 · 2012: 11
- FWCI
- 2.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Experimental Gerontology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ligue Contre le Cancer
- Topics
- Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
- Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
- Keywords
- replicative senescence, autophagy, autophagosomes, beta-galactosidase, autolysosomes, lysosomes, lipofuscin accumulation, monodansylcadaverine, MRC-5 fibroblasts
- MeSH terms
- Autophagy, beta-Galactosidase, Cadaverine, Cells, Cultured, Inclusion Bodies, Fibroblasts, Humans, Lipofuscin, Microscopy, Electron, Microscopy, Fluorescence, Biomarkers, Cellular Senescence
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