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Related Experiment Videos

The telomeric length and heterogeneity decrease with age in normal human oral keratinocytes.

Mo K Kang1, Jerry Swee, Reuben H Kim

  • 1Dental Research Institute, University of California, 73-017 CHS, 10833 Le Conte Avenue, Los Angeles, CA 90095-1668, USA.

Mechanisms of Ageing and Development
|February 19, 2002
PubMed
Summary

Telomere length shortens with age in normal human oral keratinocytes (NHOK), indicating cellular replication in situ. Shorter telomeres and reduced length heterogeneity in aging NHOK suggest a critical limit for cell survival.

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Area of Science:

  • Cell Biology
  • Genetics
  • Gerontology

Background:

  • Telomeres are protective caps at the ends of chromosomes.
  • Telomere shortening is associated with cellular aging and replicative senescence.
  • Understanding telomere dynamics in different cell types is crucial for aging research.

Purpose of the Study:

  • To investigate telomere length and its correlation with age in normal human oral keratinocytes (NHOK).
  • To compare telomere length in NHOK with normal human oral fibroblasts (NHOF).
  • To assess the heterogeneity of telomere length in NHOK across different age groups.

Main Methods:

  • Genomic DNA isolation from NHOK explanted from 28 donors (ages 21-84).
  • Digestion of DNA with HinFI to obtain terminal restriction fragments (TRF).

Related Experiment Videos

  • Measurement and analysis of TRF length and heterogeneity.

    • Main Results:

    • NHOK telomere length (mean 5.3 kbp) was significantly shorter than NHOF (mean 8.9 kbp).
    • TRF length in NHOK showed a significant inverse correlation with donor age (–23 bp/year).
    • Telomere length heterogeneity in cultured NHOK decreased with increasing donor age.

    Conclusions:

    • Clonogenic NHOK cells exhibit in situ replication with progressive telomere shortening.
    • Short telomere length and reduced heterogeneity in aging NHOK suggest a critical threshold for cell survival.
    • These findings contribute to understanding cellular aging mechanisms in oral tissues.