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Singal SS, Nygard K, Gratton R, Jansson T, Gupta MB. Increased Insulin-like Growth Factor Binding Protein-1 Phosphorylation in Decidualized Stromal Mesenchymal Cells in Human Intrauterine Growth Restriction Placentas. J Histochem Cytochem 2018; 66:617-630. [PMID: 29718759 DOI: 10.1369/0022155418772574] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Intrauterine growth restriction (IUGR) is often caused by placental insufficiency, which is believed to be associated with decreased delivery of oxygen and nutrients to the placental barrier. We recently reported that hypoxia and/or leucine deprivation triggered hyperphosphorylation of insulin-like growth factor binding protein-1 (IGFBP-1) in decidualized human immortalized endometrial stromal cells (HIESCs), resulting in decreased insulin-like growth factor-1 (IGF-1) bioactivity. To test the hypothesis that human IUGR is associated with increased decidual IGFBP-1 phosphorylation at discrete sites, we used IUGR and gestational age matched appropriate for gestational age (AGA) placentas ( n=5 each). We performed dual immunofluorescence immunohistochemistry (IHC) using IGFBP-1 and vimentin as decidual and mesenchymal markers, respectively. Employing a unique strategy with imaging software, we extracted signal intensity of IGFBP-1 expressed specifically from truly decidualized cells of the placenta. Relative IGFBP-1 was increased (85%; p=0.0001) and using custom phospho-site-specific antibodies, we found that IGFBP-1 phosphorylation (pSer101; +40%, p=0.0677/pSer119; +60%, p=0.0064/pSer169; +100%, p=0.0021) was markedly enhanced in IUGR. Together, our data links for the first time, increased decidual IGFBP-1 phosphorylation at discrete sites with human IUGR. These novel findings suggest that hyperphosphorylation of IGFBP-1 in decidualized stromal mesenchymal decidua basalis contributes to potentially elevated levels of phosphorylated IGFBP-1 in maternal circulation in IUGR pregnancies.
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Affiliation(s)
- Sahil S Singal
- Department of Biochemistry, University of Western Ontario, London, Ontario, Canada
| | - Karen Nygard
- Biotron, University of Western Ontario, London, Ontario, Canada
| | - Robert Gratton
- Department of Obstetrics & Gynecology, University of Western Ontario, London, Ontario, Canada
| | - Thomas Jansson
- Department of Obstetrics & Gynecology, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Madhulika B Gupta
- Department of Biochemistry, University of Western Ontario, London, Ontario, Canada.,Department of Pediatrics, University of Western Ontario, London, Ontario, Canada.,Children's Health Research Institute, London, Ontario, Canada
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Le A, Wang ZH, Dai XY, Xiao TH, Zhuo R, Zhang B, Xiao Z, Fan X. Icaritin inhibits decidualization of endometrial stromal cells. Exp Ther Med 2017; 14:5949-5955. [PMID: 29285144 PMCID: PMC5740763 DOI: 10.3892/etm.2017.5278] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 07/28/2017] [Indexed: 12/12/2022] Open
Abstract
The aim of the present study was to investigate the effects of Icaritin on the proliferation and decidualization of endometrial stromal cells (ESCs). A total of 20 specimens of endometrium were collected during hysterectomy at the Gynecology Department of Shenzhen Nanshan People's Hospital (Shenzhen, China) between August 2014 and December 2015. The endometrium was digested with high concentrations of collagenase and DNase and filtered with meshes, and then the glandular epithelial and stromal cells were separated by the adhesion purification method. The purity of stromal cells was identified by vimetin and cytokeratin 7 immunostaining. The estradiol + progesterone (E2+P4) and/or cyclic adenosine monophosphate (cAMP) were added to induce an in vitro decidualization model, which was used to analyze the effect of Icaritin on the decidualization ability of the human ESCs. The decidualization markers of human ESCs, prolactin (PRL) and insulin-like growth factor-binding protein 1 (IGFBP-1), was analyzed by reverse-transcription quantitative polymerase chain reaction measurements of the mRNA levels, PRL immunostaining and ELISA analysis of the IGFBP-1 protein levels in the cells or cell culture supernatant separately. The results demonstrated that treatment with E2+P4 and/or cAMP for 96 h was able to induce decidualization in ESCs, and that the cells demonstrated polygon-shaped epithelioid changes. The cell nuclei revealed multinuclear changes, and the cells were also observed to be large and round in shape. The PRL expression and upregulated IGFBP-1 mRNA and protein levels in the E2+P4+cAMP treatment group indicated successful decidualization of the in vitro model. However, the addition of Icaritin inhibited the expression of PRL and IGFBP-1 mRNA, as well as IGFBP-1 protein in the induced ESCs compared with groups without Icaritin. These results suggest that Icaritin was able to inhibit the expression of decidualization-related genes in ESCs in vitro. However, the exact mechanisms require further investigation.
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Affiliation(s)
- Aiwen Le
- Department of Obstetrics and Gynecology, Affiliated Shenzhen Nanshan People's Hospital of Guangdong Medical University, Shenzhen, Guangdong 518052, P.R. China
| | - Zhong Hai Wang
- Department of Obstetrics and Gynecology, Affiliated Shenzhen Nanshan People's Hospital of Guangdong Medical University, Shenzhen, Guangdong 518052, P.R. China
| | - Xiao Yun Dai
- Department of Obstetrics and Gynecology, Affiliated Shenzhen Nanshan People's Hospital of Guangdong Medical University, Shenzhen, Guangdong 518052, P.R. China
| | - Tian Hui Xiao
- Department of Obstetrics and Gynecology, Affiliated Shenzhen Nanshan People's Hospital of Guangdong Medical University, Shenzhen, Guangdong 518052, P.R. China
| | - Rong Zhuo
- Department of Obstetrics and Gynecology, Affiliated Shenzhen Nanshan People's Hospital of Guangdong Medical University, Shenzhen, Guangdong 518052, P.R. China
| | - Baozhen Zhang
- Laboratory for Reproductive Health, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, P.R. China
| | - Zhonglin Xiao
- Laboratory for Reproductive Health, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, P.R. China
| | - Xiujun Fan
- Laboratory for Reproductive Health, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, P.R. China
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