Leukocyte telomere dynamics: longitudinal findings among young adults in the Bogalusa Heart Study.

Leukocyte telomere dynamics: longitudinal findings among young adults in the Bogalusa Heart Study.
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DOI:
10.1093/aje/kwn338
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发表时间:
2009-02-01
影响因子:
5
通讯作者:
Berenson GS
Berenson GS
中科院分区:
医学2区
文献类型:
--
作者:
Aviv A;Chen W;Gardner JP;Kimura M;Brimacombe M;Cao X;Srinivasan SR;Berenson GS

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白细胞端粒长度(LTL)表面上是人类衰老的生物标志物。横断面分析发现,在许多与衰老相关的疾病中,LTL 相对较短。这些研究还提供了年龄依赖性 LTL 缩短的间接估计。在本文中,作者报告了对路易斯安那州 450 名白人和 185 名非裔美国人(基线(1995-1996 年)和随访(2001-2006 年)检查年龄分别为 31.4 岁和 37.4 岁)参加 Bogalusa 心脏研究的第一项综合纵向研究的结果。 LTL 的变化率在个体之间差异很大,有些人在随访期间 LTL 出现了矛盾的增长。最引人注目的观察结果是,年龄相关的 LTL 缩短与基线检查时的 LTL 成正比。在基线和后续检查中,非裔美国人的 LTL 比白人长,吸烟者的 LTL 比不吸烟者短。非裔美国人的零担比白人更长,部分解释了非裔美国人的零担缩短速度更快。这些发现强调了体内白细胞端粒动力学的复杂性,并表明除了“末端复制问题”之外的决定因素也导致体内端粒缩短。
Leukocyte telomere length (LTL) is ostensibly a biomarker of human aging. Cross-sectional analyses have found that LTL is relatively short in a host of aging-related diseases. These studies have also provided indirect estimates of age-dependent LTL shortening. In this paper, the authors report findings of the first comprehensive longitudinal study of 450 whites and 185 African Americans in Louisiana (aged 31.4 and 37.4 years at baseline (1995–1996) and follow-up (2001–2006) examinations, respectively) participating in the Bogalusa Heart Study. Rate of change in LTL was highly variable among individuals, with some displaying a paradoxical gain in LTL during the follow-up period. The most striking observation was that age-dependent LTL shortening was proportional to LTL at baseline examination. At both baseline and follow-up examinations, African Americans had longer LTLs than whites, and smokers had shorter LTLs than nonsmokers. The longer LTL in African Americans than in whites explained in part the faster rate of LTL shortening observed among African Americans. These findings underscore the complexity of leukocyte telomere dynamics in vivo and suggest that determinants in addition to the “end-replication problem” contribute to telomere shortening in vivo.
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