Purpose. To investigate the telornere hypothesis of cellular aging as the mechanism for cell cycle arrest in normal human corneal endothelium. Methods. The corneal endothelium and epithelium from human corneas from donors aged 6 weeks, 13 months, and 16, 31, 40, 54, and 84 years were dissected and frozen at -70°C. Purified DNA, digested with the restriction enzyme, Hinfl, was run on 0.7% agarose gels, probed with radiolabelled (AATCCC)4, and exposed to a Phosphorlmager screen (Molecular Dynamics). The length of the peak terminal restriction fragment (TRF) signal was determined by densitometry using ImageQuant software. Results. The endothelial cells had TRF lengths ranging from 10.8-12.0 kbp (mean 11.57). Corneal epithelial samples showed variable TRF lengths (mean 10.41. range 7.9-11.5). Conclusion. Human corneal endothelial cells have long telomeres. Their limited replicative ability is not explained by critically short telomere lengths.
|Original language||English (US)|
|Journal||Investigative Ophthalmology and Visual Science|
|State||Published - Dec 1 1997|
ASJC Scopus subject areas
- Sensory Systems
- Cellular and Molecular Neuroscience