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Cellular biomarkers of aging.
1Wistar Institute, Philadelphia, Pennsylvania 19104.
Experimental Gerontology
|January 1, 1988
Summary
Cellular aging in human fibroblasts (WI-38 and IMR-90 cells) leads to reduced proliferation. DNA synthesis fraction and saturation density serve as reliable biomarkers for assessing this functional age.
Area of Science:
- Cell Biology
- Gerontology
- Biomarkers
Background:
- Normal human fibroblast cells exhibit decreased proliferation with age.
- Cellular senescence marks the irreversible loss of replicative potential.
- Key indicators of aging include reduced DNA synthesis and lower saturation density.
Purpose of the Study:
- To characterize the fraction of DNA-synthesizing cells and saturation density in aging fibroblast cell lines.
- To establish reliable biomarkers for assessing cellular aging.
- To correlate these biomarkers with the functional decline in proliferative capacity.
Main Methods:
- Culturing and subculturing of 36 WI-38 and 17 IMR-90 cell sublines.
- Quantifying the fraction of cells synthesizing DNA over time.
- Measuring saturation density at each subcultivation point until senescence.
Main Results:
- Both the fraction of DNA-synthesizing cells and saturation density consistently decreased with the progression of cell culture lifespan.
- These parameters showed a regular and predictable relationship with the percentage of the lifespan completed.
- Cell counts at subcultivation provided retrospective data for lifespan determination.
Conclusions:
- The fraction of cells synthesizing DNA and saturation density are validated as independent biomarkers for cellular aging.
- These biomarkers accurately reflect the functional decline in proliferative capacity.
- Cellular aging can be assessed functionally, independent of chronological age.