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Quantifying dense bodies and lipofuscin during aging: a morphologist's perspective.

Douglas L Schmucker1, Howard Sachs

  • 1Cell Biology and Aging Section, San Francisco Veterans Affairs Medical Center, CA 94121, USA. coach@itsa.ucsf.edu

Archives of Gerontology and Geriatrics
|February 7, 2004
PubMed
Summary

Lipofuscin, or age pigment, accumulates in cells with aging, indicating cellular senescence. While its functional impact on cell health remains debated, its accumulation is a quantifiable marker of aging in tissues.

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Area of Science:

  • Cellular Biology
  • Gerontology
  • Biochemistry

Background:

  • Secondary lysosomes containing lipofuscin (age pigment) accumulate in cells during aging.
  • This accumulation is widely accepted as an indicator of cellular senescence.
  • Previous studies show age-related increases in lipofuscin content.

Purpose of the Study:

  • To evaluate the role of quantitative morphology in assessing age-related increases in dense bodies and lipofuscin.
  • To investigate the functional consequences of lipofuscin accumulation in senescent cells.

Main Methods:

  • Utilized stereologic studies to quantify dense body volume fraction in hepatocytes and cardiac myocytes.
  • Correlated morphological findings with biochemical analyses of lysosomal enzymes.

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Main Results:

  • Reported significant age-related increases in dense body volume fraction in rat hepatocytes (two- to eightfold) and cardiac myocytes (fourfold).
  • Observed accumulation of inactive lysosomal enzymes in liver and heart muscle, potentially linked to lipofuscin deposits.

Conclusions:

  • Quantitative morphology is a reliable method for estimating age-related increases in dense body and lipofuscin inclusions.
  • The functional impact of lipofuscin accumulation on cell function requires further investigation, though inactive enzyme accumulation suggests potential compromise.