Abstract
UCHL1 is expressed specifically in the brain and gonads of almost all studied model organisms including Drosophila, zebrafish, amphibians, and mammals, suggesting a high degree of evolutionary conservation in its structure and function. Although UCHL1 has been involved in spermatogenesis in mice, its specific expression in mammal placenta remains elusive. Our previous work has revealed that UCHL1 is highly expressed in oocytes, and has been involved in mouse ovarian follicular development. Here, we further examined UCHL1 expression change in endometria during early natural pregnancy, with different stages of the estrous cycle and pseudopregnancy as control. The UCHL1 gene deletion model showed that UCHL1 protein is associated with endometrial development, and its deletion leads to infertility. Notably, we demonstrate evidence showing the distinct expression pattern of UCHL1: weak expression over the uterine endometria, strong expression in decidualized stromal cells at the implantation site with a peak at pregnancy D6, and a shift with primary decidualization to secondary decidualized zones. Using the delayed implantation, the delayed implantation activation, and the artificial decidualization models, we have demonstrated that strong expression of UCHL1 occurred in response to decidualization and estrogen stimulation. These observations suggest that during the early proliferation and differentiation of mouse uterine decidua, UCHL1 expression is up-regulated, and formed an unique intracellular distribution mode. Therefore, we proposed that UCHL1 is involved in decidualization, and possibly in response to estrogen regulation.
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Acknowledgements
We thank the National Natural Science Foundation of China (No. 81370682, 81170569), Project from Science and Technology Commission of Shanghai Municipality, China (No. 17140901700), and Science and Technology Climbing Fund of SIPPR (No. PD2017-7) for financial support.
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Hao, L., Song, D., Zhuang, M. et al. Gene UCHL1 expresses specifically in mouse uterine decidual cells in response to estrogen. Histochem Cell Biol 154, 275–286 (2020). https://doi.org/10.1007/s00418-020-01880-y
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DOI: https://doi.org/10.1007/s00418-020-01880-y