Abstract
Background: A longer leukocyte telomere length (LTL) in women than men has been attributed to a slow rate of LTL attrition in women, perhaps due to high estrogen exposure during the premenopausal period.
Methods: To test this premise we performed a longitudinal study (an average follow-up of 12 years) in a subset of the population-based Danish National Twin Registry. Participants consisted of 405 women, aged 37.5 (range 18.0-64.3) years, and 329 men, aged 38.8 (range 18.0-58.5) years, at baseline examination.
Results: Women showed a longer LTL [kb +/- standard error(SE)] than men (baseline: 7.01 +/- 0.03 vs 6.87 +/- 0.04; follow-up: 6.79 +/- 0.03 vs 6.65 +/- 0.03; both P = 0.005). Women displayed deceleration of LTL attrition (bp/years +/- SE), as they transitioned from the premenopausal period (20.6 +/- 1.0) through the perimenopausal period (16.5 +/- 1.3) to the postmenopausal period (15.1 +/- 1.7). Age was not associated with LTL attrition in women after statistical control for menopausal status. Men, in contrast, displayed a trend for age-dependent increase in the rate of LTL attrition, which differed significantly from the pattern in women (P for interaction = 0.01).
Conclusions: Results indicate that the premenopausal period is expressed in a higher rate of LTL attrition than the postmenopausal period. They further suggest that the sex gap in LTL stems from earlier ages-the period of growth and development. The higher rate of LTL attrition in premenopausal women, we propose, might relate to estrogen-mediated increased turnover of erythrocytes, menstrual bleeding or both.
Original language | English |
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Pages (from-to) | 1688-1695 |
Number of pages | 8 |
Journal | International Journal of Epidemiology |
Volume | 44 |
Issue number | 5 |
DOIs | |
Publication status | Published - Oct-2015 |
Keywords
- Telomeres
- women
- men
- menopause
- ESTROGEN
- MORTALITY
- ADULTS
- TWINS