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Related Experiment Videos

Pigments in aging: an overview.

Eduardo A Porta1

  • 1Department of Pathology, University of Hawaii, School of Medicine, Honolulu, Hawaii 96822, USA. portae@jabsom.biomed.hawaii.edu

Annals of the New York Academy of Sciences
|April 27, 2002
PubMed
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Lipofuscin, or age pigment, accumulates in cells with aging. Despite common beliefs, lipofuscin differs from ceroid pigments and its role in oxidative stress requires further in vivo investigation.

Area of Science:

  • Cell Biology
  • Aging Research
  • Biochemistry

Background:

  • Normal aging involves pigmentary changes, primarily involving melanin and lipofuscin.
  • Lipofuscin, known as age pigment, consistently increases with age, accumulating in lysosomes of postmitotic and stable cells.
  • This accumulation is a highly consistent and evolutionarily conserved morphologic hallmark of aging.

Observation:

  • Lipofuscin exhibits characteristic autofluorescence, sudanophilia, argyrophilia, PAS positiveness, and acid fastness.
  • Distinguishing lipofuscin from ceroid pigments has been challenging due to shared physicochemical properties and the use of the term lipofuscin/ceroid.
  • In vitro studies often lead to misconceptions about lipofuscin's in vivo behavior and its relationship with oxidative stress.

Findings:

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  • Lipofuscin and ceroid pigments possess distinct tissue distribution, accumulation rates, precursor origins, and lectin binding affinities.
  • Current evidence suggests that assumptions about lipofuscin being a direct marker of oxidative stress and its modification by antioxidants are primarily based on in vitro data, lacking robust in vivo support.
  • The extraction and spectrofluorometric measurement of lipofuscin from tissues using lipid solvents is a common misconception.

Implications:

  • Clarifying the distinctions between lipofuscin and ceroid pigments is crucial for accurate research into aging and disease.
  • Further in vivo studies are needed to understand the true role of lipofuscin in cellular aging and oxidative stress.
  • Revisiting common methodologies and assumptions regarding lipofuscin analysis is essential for advancing the field of aging research.