Abstract
With improvements in the survival rate of patients with cancer, fertility maintenance has become a major concern in terms of cancer treatment for women of reproductive age. Thus, it is important to examine the impact on fertility of anticancer drugs that are used clinically or are undergoing trials. The HuR small-molecule inhibitor MS-444 has been used in many cancer treatment studies, but its reproductive toxicity in females is unknown. Here, we reported that MS-444 blocked the nucleocytoplasmic transport of Agbl2 mRNA by inhibiting HuR dimerization, resulting in the developmental arrest of 2-cell stage embryos in mouse. Combining analysis of low-input RNA-seq for MS-444-treated 2-cell embryos and mapping binding sites of RNA-binding protein, Agbl2 was predicted to be the target gene of MS-444. For further confirmation, RNAi experiment in wild-type zygotes showed that Agbl2 knockdown reduced the proportion of embryos successfully developed to the blastocyst stage: from 71% in controls to 23%. Furthermore, RNA-FISH and luciferase reporter analyses showed that MS-444 blocked the nucleocytoplasmic transport of Agbl2 mRNA and reduced its stability by inhibiting HuR dimerization. In addition, optimized stochastic optical reconstruction microscopy (STORM) imaging showed that MS-444 significantly reduced the HuR dimerization, and HuR mainly existed in cluster form in 2-cell stage embryos. In conclusion, this study provides clinical guidance for maintaining fertility during the treatment of cancer with MS-444 in women of reproductive age. And also, our research provides guidance for the application of STORM in nanometer scale studies of embryonic cells.
Graphical abstract
HuR inhibitor MS-444 arrested embryonic development at 2-cell stage.
Low-input RNA-seq revealed that Agbl2 was the target gene of MS-444.
MS-444 blocked the nucleocytoplasmic transport of Agbl2 mRNA by inhibiting HuR dimerization and reduced the stability of Agbl2 mRNA.
STORM with our optimized protocol showed that HuR tended to form elliptical and dense clusters in 2-cell stage embryos.
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Data availability
Low-input RNA sequencing and processed files have been deposited in the Gene Expression Omnibus (http://www.ncbi.nlm.nih.gov/geo) under accession number GSE192494.
Code availability
Not applicable.
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This study was approved by the National Nature Science Foundation of China (81720108017, 32000806), the National Major Scientific Instruments and Equipment Development Project, and National Nature Science Foundation of China (61827814).
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Yongqiang Nie designed and performed the experiments, analyzed the data, and wrote the draft of the manuscript. Wei Xu performed the experiments of RNA-seq. Geng G. Tian helped to analyze the data. Xiaowei Li, Yan Guo, Xuefeng Liu, Lin He, and Zhifeng Shao gave guidance to the experiment. Xiaoyong Li gave guidance to the experiment, analyzed the data, and revised the manuscript. Ji Wu conceptualized and supervised the entire project, analyzed the data, revised the manuscript, and funded the acquisition.
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All animal experiments were approved by the Institutional Animal Care and Use Committee of Shanghai and performed in accordance with the National Research Council Guide for Care and Use of Laboratory Animals. The ethical approval number for our research is A2016084.
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Nie, Y., Xu, W., Tian, G.G. et al. Mechanistic insights into HuR inhibitor MS-444 arresting embryonic development revealed by low-input RNA-seq and STORM. Cell Biol Toxicol 38, 1175–1197 (2022). https://doi.org/10.1007/s10565-022-09757-7
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DOI: https://doi.org/10.1007/s10565-022-09757-7