Alteration of relative telomere length and telomerase reverse transcriptase expression in the granulosa cells of women during aging and assessment of <em>in vitro</em> fertilization outcomes

Hao,Yan; Lv,Mingrong; Peng,Jing; Kuang,Dan; Zhang,Zhihua; Zhang,Zhou; Wang,Tingting; Yang,Bo; Wei,Zhaolian; Zhou,Ping; Zhang,Zhiguo; Cao,Yunxia

doi:10.3892/mmr.2023.13093

Alteration of relative telomere length and telomerase reverse transcriptase expression in the granulosa cells of women during aging and assessment of in vitro fertilization outcomes

Authors:
- Yan Hao
- Mingrong Lv
- Jing Peng
- Dan Kuang
- Zhihua Zhang
- Zhou Zhang
- Tingting Wang
- Bo Yang
- Zhaolian Wei
- Ping Zhou
- Zhiguo Zhang
- Yunxia Cao
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Affiliations: Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China, Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui 230032, P.R. China
Published online on: September 18, 2023 https://doi.org/10.3892/mmr.2023.13093
Article Number: 206
Copyright: © Hao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Telomere attrition plays a critical role in the reproductive aging process in humans. Telomere length (TL) is typically regulated by telomerase, the main component of which is telomerase reverse transcriptase (TERT). The aim of the present study was to investigate the changes of relative TL (RTL) and TERT expression in granulosa cells (GCs) during aging and its association with reproduction. Clinical data on the frozen‑thawed embryo transfer cycles of older (>35 year old) and younger (≤35 year old) women from a single center over a 3‑year period were retrospectively analyzed. Preimplantation genetic testing for chromosome aneuploidies in older women during the same period was also analyzed. Following the analysis of the data, several biological characteristics of senescent GCs were explored. In addition, a total of 160 women who were undergoing their ﬁrst fresh cycle of in vitro fertilization (IVF) or intracytoplasmic sperm injection were included in the study. GCs were collected from all participants. The changes of RTL and TERT expression in GCs during aging were investigated using quantitative PCR and western blotting. The associations of RTL and TERT with IVF outcomes were also assessed. The clinical data demonstrated that the pregnancy and live birth rates of women aged >35 years were ~20% lower than those of women aged ≤35 years, and the number of embryos with aneuploidy was 7‑fold of that without euploidy in the older age group. An aging‑induced change in follicle stimulating hormone receptor expression was observed. A shorter TL and increased TERT expression were detected in the older women. A significant inverse correlation between the expression levels of TERT and oocyte yield was identified. However, no association of RTL and TERT with blastocyst formation rate and the probability of clinical pregnancy was detected. It may be concluded that RTL and TERT alterations in GCs are potential determinants of ovarian aging. TERT expression in GCs appears to be a potential biomarker for the prediction of ovarian response, which provides a novel strategy for the assessment of female fertility.

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