Abstract
Dexamethasone is widely used to treat pregnancy disorders related to premature delivery. However, lots of researches have confirmed that prenatal dexamethasone exposure (PDE) could increase the risk of offspring multiple diseases. This study was designed to elucidate the epigenetic mechanism of adrenal developmental programming and explore its early warning marker in peripheral blood mononuclear cells (PBMC). We found the adrenal morphological and functional changes of PDE male offspring rats before and after birth, which were mainly performed as the decreased serum corticosterone concentration, steroidogenic acute regulatory (StAR) protein expression, and histone 3 lysine 27 acetylation (H3K27ac) level of steroidogenic factor 1 (SF1) promoter region and its expression. Simultaneously, the expressions of glucocorticoid receptor (GR) and histone acetylation enzyme 5 (HDAC5) in the PDE male fetal rats were increased. In vitro, dexamethasone reduced the expression of SF1, StAR, and cortisol production and still increased the expression of GR and HDAC5, the binding between GR and SF1 promoter region, and protein interaction between GR and HDAC5. GR siRNA or HDAC5 siRNA was able to reverse the above roles of dexamethasone. Furthermore, in vivo, we confirmed that H3K27ac levels of SF1 promoter region and its expression in PBMC of the PDE group were decreased before and after birth, showing a positive correlation with the same indexes in adrenal. Meanwhile, in clinical trials, we confirmed that prenatal dexamethasone application decreased H3K27ac of SF1 promoter region and its expression in neonatal PBMC. In conclusion, PDE-caused adrenal insufficiency of male offspring rats was related to adrenal GR activated by dexamethasone in uterus. The activated GR, on the one hand, increased its direct binding to SF1 promoter region to inhibit its expression, on the other hand, upregulated and recruited HDAC5 to decrease H3K27ac level of SF1 promoter region, and strengthened the inhibition of SF1 and subsequent StAR expression.
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Funding
This work was supported by grants from the National Key Research and Development Program of China (No. 2020YFA0803900), the National Natural Science Foundation of China (No. 82030111, 81673524, 82104312), the Major Technological Innovation Projects of Hubei Province (No. 2019ACA140, 2020BCA071), Hubei Province’s Outstanding Medical Academic Leader program, and Medical Science Advancement Program (Basic Medical Sciences) of Wuhan University, Grant No. TFJC2018001.
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Guanghui Chen, Can Ai, and Jiangang Cao performed the research; Hui Wang designed the research study; Fangfang Duan, Jinzhi Zhang, and Yawen Chen analyzed the data; Guanghui Chen, Ying Ao, and Hui Wang wrote and revised the paper; all authors approved the final manuscript.
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The experimental protocol was approved by the Ethics Committee for Animal (Certification No. 42000600002258; Permission No. 20170018) and Human (No: 2016016) Experiments of the Medical College of Wuhan University.
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Guanghui Chen, Can Ai and Fangfang Duan contributed equally to this paper
Highlights
• Adrenal insufficiency induced by PDE associated with inhibited SF1/StAR expression.
• Dexamethasone inhibits H3K27ac level of SF1 promoter region by GR/HDAC5.
• H3K27ac level of SF1 promoter region in PBMC is a biomarker of adrenal insufficiency.
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Chen, G., Ai, C., Duan, F. et al. Low H3K27 acetylation of SF1 in PBMC: a biomarker for prenatal dexamethasone exposure-caused adrenal insufficiency of steroid synthesis in male offspring. Cell Biol Toxicol 39, 2051–2067 (2023). https://doi.org/10.1007/s10565-021-09691-0
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DOI: https://doi.org/10.1007/s10565-021-09691-0