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Maternal tamoxifen exposure leads to abnormal primordial follicle assembly

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Abstract

Tamoxifen (TAM) is an accredited drug used for treatment and prevention of breast cancer. Due to the long-term taking and the trend for women to delay childbearing, inadvertent conception occasionally occurs during TAM treatment. To explore the effects of TAM on a fetus, pregnant mice at gestation day 16.5 were orally administrated with different concentrations of TAM. Molecular biology techniques were used to analyze the effects of TAM on primordial follicle assembly of female offspring and the mechanism. It was found that maternal TAM exposure affected primordial follicle assembly and damaged the ovarian reserve in 3 dpp offspring. Up to 21 dpp, the follicular development had not recovered, with significantly decreased antral follicles and decreased total follicle number after maternal TAM exposure. Cell proliferation was significantly inhibited; however, the cell apoptosis was induced by maternal TAM exposure. Epigenetic regulation was also involved in the process of TAM induced abnormal primordial follicle assembly. The changed levels of H3K4me3, H3K9me3, and H3K27me3 presented the function of histone methylation in the regulation of the effects of maternal TAM exposure on the reproduction of female offspring. Moreover, the changed level of RNA m6A modification and the changed expression of genes related to transmethylation and demethylation proved the role of m6A in the process. Maternal TAM exposure led to abnormal primordial follicle assembly and follicular development by affecting cell proliferation, cell apoptosis, and epigenetics.

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Acknowledgements

This work was supported by the Key Research and Development Program of Shandong Province (2021LZGC001), Taishan Scholar Foundation of Shandong Province of China (ts20190946) and Natural Science Foundation of Shandong Province, China (ZR2017MC033).

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All authors contributed to the study conception and design. Material preparation was performed by J.Z., J.Z., and R.W. Data collection and analysis were performed by Y.S. and D.S. The experiments were designed by W.S. and X.S. The first draft of the manuscript was written by X.S. All authors reviewed the manuscript.

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Correspondence to Wei Shen or Xiaofeng Sun.

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418_2023_2196_MOESM1_ESM.tif

Fig S1: Maternal TAM exposure changed the serum levels of E2. (a) TAM serum concentrations in orally administered TAM mice detected by ELISA. (b) Serum levels of E2 detected by ELISA (TIF 2095 KB)

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Zhao, J., Zhang, J., Sun, Y. et al. Maternal tamoxifen exposure leads to abnormal primordial follicle assembly. Histochem Cell Biol 160, 97–111 (2023). https://doi.org/10.1007/s00418-023-02196-3

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  • DOI: https://doi.org/10.1007/s00418-023-02196-3

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