Estrogen receptor β regulates endometriotic cell survival through serum and glucocorticoid–regulated kinase activation Diana Monsivais, Ph.D., Matthew.

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Presentation transcript:

Estrogen receptor β regulates endometriotic cell survival through serum and glucocorticoid–regulated kinase activation Diana Monsivais, Ph.D., Matthew T. Dyson, Ph.D., Ping Yin, Ph.D., Antonia Navarro, Ph.D., John S. Coon, M.S., Mary Ellen Pavone, M.D., Serdar E. Bulun, M.D. Fertility and Sterility Volume 105, Issue 5, Pages 1266-1273 (May 2016) DOI: 10.1016/j.fertnstert.2016.01.012 Copyright © 2016 American Society for Reproductive Medicine Terms and Conditions

Figure 1 Serum and glucocorticoid–regulated kinase (SGK1) expression is elevated in patients with endometriosis. (A) Immunoblot showing that SGK1 protein levels are elevated in stromal cells derived from endometriosis (E-Osis) compared with normal endometrium (NoEM). (B) Densitometry analysis showing that SGK1 protein levels are significantly increased in E-Osis compared with NoEM. (C) Quantitative real-time polymerase chain reaction was performed on mRNA isolated from NoEM and E-Osis tissues and shows that SGK1 mRNA is significantly overexpressed in E-Osis compared with NoEM (n = 8). SGK1 immunofluorescence of (D) NoEM and (E) E-Osis, demonstrating higher expression of SGK1 (red) in E-Osis versus NoEM. Nuclei were stained with DAPI (blue). Images show hematoxylin and eosin staining imaged at 10× (bar = 100 μm); insets show immunofluorescence imaged at 40× (bar = 40 μm). (F) Quantification of the SGK1 immunofluorescence intensity in NoEM and E-Osis (n = 5). *P<.05; ***P<.0001 (Student t test) (48). Fertility and Sterility 2016 105, 1266-1273DOI: (10.1016/j.fertnstert.2016.01.012) Copyright © 2016 American Society for Reproductive Medicine Terms and Conditions

Figure 2 Estradiol regulates serum and glucocorticoid–regulated kinase (SGK1) via estrogen receptor (ER) β in endometriosis. (A) Endometriotic stromal cells were treated with 10−7 mol/L E2 for 2 hours and 6 hours. Immunoblot shows that SGK1 protein levels increased in response to E2. (B) Densitometry analysis (n = 5) shows that SGK1 protein levels increased significantly in response to E2 treatment after 2 hours. (C) Endometriotic stromal cells were treated with E2, DPN (ERβ agonist), and PPT (ERα agonist) for 2 hours, followed by SGK1 protein analysis. (D) Densitometry analysis (n = 3) demonstrates that E2, DPN, and PPT significantly induce SGK1 protein expression in endometriosis. *P<.05; (2-way analysis of variance with Tukey multiple-comparison post test). Fertility and Sterility 2016 105, 1266-1273DOI: (10.1016/j.fertnstert.2016.01.012) Copyright © 2016 American Society for Reproductive Medicine Terms and Conditions

Figure 3 ERβ regulates the transcription of SGK1 in endometriosis. (A) Chromatin immunoprecipitation of ERβ followed by quantitative polymerase chain reaction was performed in E-Osis cells (n = 3) treated with 10−7 mol/L E2 for 45 minutes. ERβ was significantly enriched ∼2kb upstream of the SGK1 transcriptional start site (TSS) after E2 treatment. (B) siRNA-mediated ERβ knockdown in E-Osis cells resulted in decreased SGK1 protein expression. (C and D) Densitometry analysis (n = 3) shows that SGK1 protein levels were significantly decreased in E-Osis after ERβ knockdown. *P<.05; **P<.001; (Student t test or 2-way analysis of variance with Tukey multiple-comparison post test). Abbreviations as in Figure 2. Fertility and Sterility 2016 105, 1266-1273DOI: (10.1016/j.fertnstert.2016.01.012) Copyright © 2016 American Society for Reproductive Medicine Terms and Conditions

Figure 4 SGK1 inhibits apoptosis in endometriotic stromal cells. (A) Small interfering (si) RNA knockdown of SGK1 increases cleaved poly(ADP-ribose) polymerase (PARP) expression. Densitometry analysis (n = 4) showing (B) significant decrease in SGK1 expression and (C) increase in cleaved PARP expression after SGK1 knockdown compared with control samples (siCTL). (D) DPN and prostaglandin E2 (PGE2) treatments induce SGK1 expression and FOXO3a phosphorylation in E-Osis stromal cells. (E) Diagram showing SGK1 activation in response to E2/DPN/PGE2 and its downstream effects on cell survival via phosphorylation and inactivation of FOXO3a. Immunoblots are representative of experiments run with NoEM and E-Osis cell samples from three study subjects. *P<.05; **P<.001; (Student t test). Abbreviations as in Figures 1 and 2. Fertility and Sterility 2016 105, 1266-1273DOI: (10.1016/j.fertnstert.2016.01.012) Copyright © 2016 American Society for Reproductive Medicine Terms and Conditions