Related Experiment Videos
Telomere shortening with aging in human liver
K Takubo1, K Nakamura, N Izumiyama
1Department of Clinical Pathology, Tokyo Metropolitan Institute of Gerontology, Japan. takubo@tmig.or.jp
Summary
Telomere shortening accelerates with age, decreasing by 55 base pairs annually in liver tissue. This cellular aging marker shows a significant decline from infancy to old age, highlighting the aging process.
Area of Science:
- Gerontology
- Molecular Biology
- Genetics
Background:
- Telomeres, protective caps on chromosomes, shorten with each cell division.
- This shortening is a known biomarker of cellular aging and organismal senescence.
- Understanding telomere dynamics in different tissues provides insights into aging processes.
Purpose of the Study:
- To quantify the annual rate of telomere length reduction in normal human liver tissue.
- To correlate telomere length with chronological age across a wide lifespan.
- To compare telomere shortening in liver tissue with other rapidly renewing tissues.
Main Methods:
- Analysis of telomere length in liver tissue samples from 94 human subjects (0-101 years).
- Measurement of telomere length in base pairs (bp) and kilobase pairs (kbp).
- Statistical comparison of telomere lengths across different age groups and with malignancy status.
Main Results:
- Average telomere length decreases by 55 base pairs per year.
- Mean telomere length was 12.9 kbp in neonates and 8.3 kbp in centenarians.
- Telomere shortening rate appeared to slow in middle age, with no significant difference in telomere length between subjects with or without advanced malignancies (excluding liver cancer).
Conclusions:
- Liver tissue exhibits a consistent rate of telomere shortening, comparable to rapidly renewing tissues.
- Telomere length serves as a reliable indicator of biological aging in human liver.
- The aging process, reflected by telomere attrition, continues throughout the human lifespan.