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1.Department of Reproductive Endocrinology, Key Laboratory of Reproductive Genetics of National Ministry of Education, Women’s Reproductive Health Laboratory of Zhejiang Province, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou 310006, China
2.Laboratory of Reproductive Genetics, Jinhua Maternal & Child Health Care Hospital, Jinhua 321000, China
3.Department of Obstetrics, Lishui Maternal and Child Health Hospital, Lishui 323000, China
4.Department of Obstetrics and Gynecology, Women and Children’s Hospital of Ningbo University, Ningbo 315012, China
5.Center for Reproductive Medicine, Department of Reproductive Endocrinology, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital), Hangzhou Medical College, Hangzhou 310014, China
6.Department of Reproductive Endocrinology, Dongyang People’s Hospital, Dongyang 322100, China
7.Reproductive Medicine Center, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
Received:21 September 2023,
Revised:25 January 2024,
Published:13 March 2025
康诠敏,乐芳,徐夏苑等.高雌激素暴露通过降低Kdm6b的表达影响卵巢过度刺激小鼠H3K27me3的去甲基化[J].浙江大学学报(英文版)(B辑:生物医学和生物技术),2025,26(03):269-285.
Quanmin KANG, Fang LE, Xiayuan XU, et al. High-dose estrogen impairs demethylation of H3K27me3 by decreasing Kdm6b expression during ovarian hyperstimulation in mice[J]. Journal of zhejiang university-science b (biomedicine & biotechnology), 2025, 26(3): 269-285.
康诠敏,乐芳,徐夏苑等.高雌激素暴露通过降低Kdm6b的表达影响卵巢过度刺激小鼠H3K27me3的去甲基化[J].浙江大学学报(英文版)(B辑:生物医学和生物技术),2025,26(03):269-285. DOI: 10.1631/jzus.B2300681.
Quanmin KANG, Fang LE, Xiayuan XU, et al. High-dose estrogen impairs demethylation of H3K27me3 by decreasing Kdm6b expression during ovarian hyperstimulation in mice[J]. Journal of zhejiang university-science b (biomedicine & biotechnology), 2025, 26(3): 269-285. DOI: 10.1631/jzus.B2300681.
促排卵是辅助生殖技术(ART)的关键环节之一,能导致母体血清雌二醇水平升高。因此,在促排卵过程中高浓度雌激素暴露对卵母细胞和胚胎的影响一直为人们所关注。本研究利用小鼠模型和小鼠胚胎干细胞(mESCs)探讨了促排卵对卵母细胞和胚胎的形态及基因表达的影响。在本研究中,我们建立了不同促排卵方案的C57BL/6J小鼠模型,其中包括一组超剂量促排卵导致卵巢过度刺激。研究结果显示,过度刺激组小鼠的血清雌激素水平显著升高,卵巢增大,异形卵母细胞增加,以及卵裂
率和成囊率均下降。卵母细胞信使RNA(mRNA)测序结果发现差异基因去甲基化酶
Kdm6b
在过度刺激组中显著下调,这提示其可能是过度刺激引起卵母细胞和胚胎发育异常的关键分子。细胞实验表明,高雌激素暴露可下调mESCs中Kdm6b的表达,而雌激素受体拮抗剂预处理可以逆转高雌激素对Kdm6b的影响。此外,
Kdm6b
的敲降和高雌激素暴露均可导致mESCs中组蛋白H3赖氨酸27的三甲基化(H3K27me3)和大鼠磷酸化组蛋白(γ-H2AX)的表达上调,并伴随拟胚体的形成受损。综上所述,过度刺激引起的高浓度雌激素暴露可通过降低Kdm6b的表达从而影响H3K27me3的去甲基化。因此,Kdm6b是预测卵巢过度刺激患者ART结局的重要指标。
Given that ovarian stimulation is vital for assisted reproductive technology (ART
) and results in elevated serum estrogen levels
exploring the impact of elevated estrogen exposure on oocytes and embryos is necessary. We investigated the effects of various ovarian stimulation treatments on oocyte and embryo morphology and gene expression using a mouse model and estrogen-treated mouse embryonic stem cells (mESCs). Female C57BL/6J mice were subjected to two types of conventional ovarian stimulation and ovarian hyperstimulation; mice treated with only normal saline served as controls. Hyperstimulation resulted in high serum estrogen levels
enlarged ovaries
an increased number of aberrant oocytes
and decreased embryo formation. The messenger RNA (mRNA)-sequencing of oocytes revealed the dysregulated expression of lysine-specific demethylase 6b (
Kdm6b
)
which may be a key factor indicating hyperstimulation-induced aberrant oocytes and embryos. In vitro
Kdm6b expression was downregulated in mESCs treated with high-dose estrogen; treatment with an estrogen receptor antagonist could reverse this downregulated expression level. Furthermore
treatment with high-dose estrogen resulted in the upregulated expression of histone H3 lysine 27 trimethylation (H3K27me3) and phosphorylated H2A histone family member X (γ-H2AX). Notably
knockdown of
Kdm6b
and high estrogen levels hindered the formation of embryoid bodies
with a concomitant increase in the expression of H3K27me3 and γ-H2AX. Collectively
our findings revealed that hyperstimulation-induced high-dose estrogen could impair the demethylation of H3K27me3 by reducing Kdm6b expression. Accordingly
Kdm6b could be a promising marker for clinically predicting ART outcomes in patients with ovarian hyperstimulation syndrome.
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