Endocrinology Journal Article

Thyroid Hormone Induces Decidualization in hESCs

June 15, 2020
 

Maiko Kakita-Kobayashi, Hiromi Murata, Akemi Nishigaki, Yoshiko Hashimoto, Shinnosuke Komiya, Hiroaki Tsubokura, Takeharu Kido, Naoko Kida, Tomoko Tsuzuki-Nakao, Yoshiyuki Matsuo, Hidemasa Bono, Kiichi Hirota, Hidetaka Okada
Endocrinology, Volume 161, Issue 6, June 2020, bqaa049
https://doi.org/10.1210/endocr/bqaa049

Abstract

Endometrial stromal cells differentiate into decidual cells through the process of decidualization. This differentiation is critical for embryo implantation and the successful establishment of pregnancy. Recent epidemiological studies have suggested that thyroid hormone is important in the endometrium during implantation, and it is commonly believed that thyroid hormone is essential for proper development, differentiation, growth, and metabolism. This study aimed to investigate the impact of thyroid hormone on decidualization in human endometrial stromal cells (hESCs) and define its physiological roles in vitro by gene targeting. To identify the expression patterns of thyroid hormone, we performed gene expression profiling of hESCs during decidualization after treating them with the thyroid hormone levothyroxine (LT4). A major increase in decidual response was observed after combined treatment with ovarian steroid hormones and thyroid hormone. Moreover, LT4 treatment also affected the regulation of many transcription factors important for decidualization. We found that type 3 deiodinase, which is particularly important in fetal and placental tissues, was upregulated during decidualization in the presence of thyroid hormone. Further, it was observed that progesterone receptor, an ovarian steroid hormone receptor, was involved in thyroid hormone–induced decidualization. In the absence of thyroid hormone receptor (TR), due to the simultaneous silencing of TRα and TRβ, thyroid hormone expression was unchanged during decidualization. In summary, we demonstrated that thyroid hormone is essential for decidualization in the endometrium. This is the first in vitro study to find impaired decidualization as a possible cause of infertility in subclinical hypothyroidism (SCH) patients.

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