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Sex-dependent telomere shortening, telomerase activity and oxidative damage in marine medaka Oryzias melastigma during aging.

Abstract：

:Marine medaka Oryzias melastigma at 4months (young), 8months (middle-aged) and 12months old (senior) were employed to determine age-associated change of sex ratios, sex hormones, telomere length (TL), telomerase activity (TA), telomerase transcription (omTERT) and oxidative damage in the liver. Overall, O. melastigma exhibited gradual senescence, sex differences in longevity (F>M), TL (F>M) and oxidative damage (F5kb), TA and omTERT expression (p≤0.01), and negatively correlated with liver DNA oxidation (p≤0.05). The results suggest high levels of E2 in female O. melastigma may retard TL shortening by enhancing TA via TERT transcription and/or reducing oxidative DNA damage. The findings support TL shortening as a biomarker of aging and further development of accelerated TL shortening, abnormal suppression of TA and excessive oxidative DNA damage as early molecular endpoints, indicative of advanced/premature aging in marine medaka/fish.

journal_name

Mar Pollut Bull

journal_title

Marine pollution bulletin

authors

Yip BW,Mok HO,Peterson DR,Wan MT,Taniguchi Y,Ge W,Au DW

doi

10.1016/j.marpolbul.2017.01.021

subject

Has Abstract

pub_date

2017-11-30 00:00:00

pages

701-709

issue

2

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(17)30032-2

journal_volume

124

pub_type

杂志文章

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