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Collier AB, Viswanadhapalli S, Gopalam R, Lee TK, Kassees K, Parra K, Sharma G, Reese TC, Liu X, Yang X, Ebrahimi B, Pratap UP, Mahajan M, Arnold WC, Baker A, Chen CY, Elmore ST, Subbarayalu P, Sareddy GR, Valente PT, Kost ER, Ahn JM, Vadlamudi RK. Novel LIPA-Targeted Therapy for Treating Ovarian Cancer. Cancers (Basel) 2024; 16:500. [PMID: 38339252 PMCID: PMC10854701 DOI: 10.3390/cancers16030500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 02/12/2024] Open
Abstract
Ovarian cancer (OCa) is the most lethal form of gynecologic cancer, and the tumor heterogeneities at the molecular, cellular, and tissue levels fuel tumor resistance to standard therapies and pose a substantial clinical challenge. Here, we tested the hypothesis that the heightened basal endoplasmic reticulum stress (ERS) observed in OCa represents an exploitable vulnerability and may overcome tumor heterogeneity. Our recent studies identified LIPA as a novel target to induce ERS in cancer cells using the small molecule ERX-41. However, the role of LIPA and theutility of ERX-41 to treat OCa remain unknown. Expression analysis using the TNMplot web tool, TCGA data sets, and immunohistochemistry analysis using a tumor tissue array showed that LIPA is highly expressed in OCa tissues, compared to normal tissues. ERX-41 treatment significantly reduced the cell viability and colony formation ability and promoted the apoptosis of OCa cells. Mechanistic studies revealed a robust and consistent induction of ERS markers, including CHOP, elF2α, PERK, and ATF4, upon ERX-41 treatment. In xenograft and PDX studies, ERX-41 treatment resulted in a significant reduction in tumor growth. Collectively, our results suggest that ERX-41 is a novel therapeutic agent that targets the LIPA with a unique mechanism of ERS induction, which could be exploited to treat heterogeneity in OCa.
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Affiliation(s)
- Alexia B. Collier
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Suryavathi Viswanadhapalli
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX 78229, USA
| | - Rahul Gopalam
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Tae-Kyung Lee
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA; (T.-K.L.); (K.K.); (C.-Y.C.); (S.T.E.); (J.-M.A.)
| | - Kara Kassees
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA; (T.-K.L.); (K.K.); (C.-Y.C.); (S.T.E.); (J.-M.A.)
| | - Karla Parra
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA; (K.P.); (G.S.); (T.C.R.); (X.L.)
| | - Gaurav Sharma
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA; (K.P.); (G.S.); (T.C.R.); (X.L.)
| | - Tanner C. Reese
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA; (K.P.); (G.S.); (T.C.R.); (X.L.)
| | - Xihui Liu
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA; (K.P.); (G.S.); (T.C.R.); (X.L.)
| | - Xue Yang
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Behnam Ebrahimi
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Uday P. Pratap
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Megharani Mahajan
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - William C. Arnold
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Adriana Baker
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Chia-Yuan Chen
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA; (T.-K.L.); (K.K.); (C.-Y.C.); (S.T.E.); (J.-M.A.)
| | - Scott Terry Elmore
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA; (T.-K.L.); (K.K.); (C.-Y.C.); (S.T.E.); (J.-M.A.)
| | - Panneerdoss Subbarayalu
- Greehey Children’s Cancer Research Institute, Department of Cell Systems & Anatomy, University of Texas Health San Antonio, San Antonio, TX 78229, USA;
| | - Gangadhara R. Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX 78229, USA
| | - Philip T. Valente
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Edward R. Kost
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
| | - Jung-Mo Ahn
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA; (T.-K.L.); (K.K.); (C.-Y.C.); (S.T.E.); (J.-M.A.)
| | - Ratna K. Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, TX 78229, USA; (A.B.C.); (S.V.); (R.G.); (X.Y.); (B.E.); (U.P.P.); (M.M.); (W.C.A.); (A.B.); (G.R.S.); (P.T.V.); (E.R.K.)
- Mays Cancer Center, University of Texas Health San Antonio, San Antonio, TX 78229, USA
- Audie L. Murphy Division, South Texas Veterans Health Care System, San Antonio, TX 78229, USA
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PELP1 is overexpressed in lung cancer and promotes tumor cell malignancy and resistance to tyrosine kinase inhibitor drug. Pathol Res Pract 2022; 237:154065. [PMID: 35969940 DOI: 10.1016/j.prp.2022.154065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 08/04/2022] [Accepted: 08/07/2022] [Indexed: 12/24/2022]
Abstract
Proline, glutamate, and leucine-rich protein 1 (PELP1) are involved in several cancers, but little is known about PELP1 in lung cancer. In this study, PELP1 expression was evaluated in 305 lung cancer (NSCLC) specimens to explore the role of PELP1 in lung cancer. After silencing PELP1, the proliferation, migration, invasion of tumor cells, PELP1 in relation to cell cycle and signaling pathways were evaluated, and whole-genome exons were analyzed. PELP1 is overexpressed in lung cancer, PELP1 expression correlated with squamous carcinoma, smoking, and wild-type EGFR status (all Ps<0.001) but associated with lung cancer-specific survival (P > 0.05). Silencing significantly inhibited lung cancer cell proliferation, migration, and invasion (P < 0.05) and promoted high sensitivity of lung cancer cells to tyrosine kinase inhibitor (TKI) gefitinib. PELP1-silenced cells showed downregulated phosphorylated MAPK, cyclinD1, CDK2, and upregulated RB (P < 0.05) but no change in AKT. In PELP1-silenced lung cancer cells, 140 genes were upregulated, and 143 genes were downregulated. Furthermore, the number of T regulatory cell was higher in lung adenocarcinoma with pelp1 high-expression and pelp1 expression was negatively correlated with CD274 (PDL-1) and CTLA4. Therefore, PELP1 plays an important role in the malignant behavior of NSCLC and could be a potential therapeutic target.
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Chakravarty D, Ratnani P, Huang L, Dovey Z, Sobotka S, Berryhill R, Merisaari H, Al Shaarani M, Rai R, Jambor I, Yadav KK, Mittan S, Parekh S, Kodysh J, Wagaskar V, Brody R, Cordon-Cardo C, Rykunov D, Reva B, Davicioni E, Wiklund P, Bhardwaj N, Nair SS, Tewari AK. Association between Incidental Pelvic Inflammation and Aggressive Prostate Cancer. Cancers (Basel) 2022; 14:2734. [PMID: 35681714 PMCID: PMC9179284 DOI: 10.3390/cancers14112734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/07/2022] [Accepted: 05/23/2022] [Indexed: 12/10/2022] Open
Abstract
The impact of pelvic inflammation on prostate cancer (PCa) biology and aggressive phenotype has never been studied. Our study objective was to evaluate the role of pelvic inflammation on PCa aggressiveness and its association with clinical outcomes in patients following radical prostatectomy (RP). This study has been conducted on a retrospective single-institutional consecutive cohort of 2278 patients who underwent robot-assisted laparoscopic prostatectomy (RALP) between 01/2013 and 10/2019. Data from 2085 patients were analyzed to study the association between pelvic inflammation and adverse pathology (AP), defined as Gleason Grade Group (GGG) > 2 and ≥ pT3 stage, at resection. In a subset of 1997 patients, the association between pelvic inflammation and biochemical recurrence (BCR) was studied. Alteration in tumor transcriptome and inflammatory markers in patients with and without pelvic inflammation were studied using microarray analysis, immunohistochemistry, and culture supernatants derived from inflamed sites used in functional assays. Changes in blood inflammatory markers in the study cohort were analyzed by O-link. In univariate analyses, pelvic inflammation emerged as a significant predictor of AP. Multivariate cox proportional-hazards regression analyses showed that high pelvic inflammation with pT3 stage and positive surgical margins significantly affected the time to BCR (p ≤ 0.05). PCa patients with high inflammation had elevated levels of pro-inflammatory cytokines in their tissues and in blood. Genes involved in epithelial-to-mesenchymal transition (EMT) and DNA damage response were upregulated in patients with pelvic inflammation. Attenuation of STAT and IL-6 signaling decreased tumor driving properties of conditioned medium from inflamed sites. Pelvic inflammation exacerbates the progression of prostate cancer and drives an aggressive phenotype.
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Affiliation(s)
- Dimple Chakravarty
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Parita Ratnani
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Li Huang
- Department of Urology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510275, China;
| | - Zachary Dovey
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Stanislaw Sobotka
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Roy Berryhill
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Harri Merisaari
- Department of Radiology, University of Turku, 20014 Turku, Finland; (H.M.); (I.J.)
- Medical Imaging Centre of Southwest Finland, Turku University Hospital, 20521 Turku, Finland
| | - Majd Al Shaarani
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (M.A.S.); (R.B.); (C.C.-C.)
- Department of Pathology, George Washington University Hospital, Washington, DC 20037, USA
| | - Richa Rai
- Department of Hematology & Medical Oncology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA;
| | - Ivan Jambor
- Department of Radiology, University of Turku, 20014 Turku, Finland; (H.M.); (I.J.)
- Medical Imaging Centre of Southwest Finland, Turku University Hospital, 20521 Turku, Finland
| | - Kamlesh K. Yadav
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
- School of Engineering Medicine, Texas A&M University, Houston, TX 77030, USA
| | - Sandeep Mittan
- Division of Cardiovascular Research, Albert Einstein College of Medicine, New York, NY 10467, USA;
| | - Sneha Parekh
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Julia Kodysh
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (J.K.); (D.R.); (B.R.)
| | - Vinayak Wagaskar
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Rachel Brody
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (M.A.S.); (R.B.); (C.C.-C.)
| | - Carlos Cordon-Cardo
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (M.A.S.); (R.B.); (C.C.-C.)
| | - Dmitry Rykunov
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (J.K.); (D.R.); (B.R.)
| | - Boris Reva
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (J.K.); (D.R.); (B.R.)
| | - Elai Davicioni
- Decipher Biosciences, A Subsidiary of Veracyte Inc., South San Francisco, CA 94080, USA;
| | - Peter Wiklund
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Nina Bhardwaj
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
- Department of Hematology and Oncology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Sujit S. Nair
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
| | - Ashutosh K. Tewari
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (P.R.); (Z.D.); (S.S.); (R.B.); (K.K.Y.); (S.P.); (V.W.); (P.W.); (N.B.); (S.S.N.); (A.K.T.)
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Song Z, Zhang G, Yu Y, Li S. A Prognostic Autophagy-Related Gene Pair Signature and Small-Molecule Drugs for Hepatocellular Carcinoma. Front Genet 2021; 12:689801. [PMID: 34497633 PMCID: PMC8419440 DOI: 10.3389/fgene.2021.689801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/28/2021] [Indexed: 02/02/2023] Open
Abstract
Dysregulation of autophagy-related genes (ARGs) is related to the prognosis of cancers. However, the aberrant expression of ARGs signature in the prognosis of hepatocellular carcinoma (HCC) remain unclear. Using The Cancer Genome Atlas and the International Cancer Genome Consortium database, 188 common autophagy-related gene pairs (ARGPs) were identified. Through univariate, least absolute shrinkage and selection operator analysis, and multivariate Cox regression analysis, a prognostic signature of the training set was constructed on the basis of 6 ARGPs. Further analysis revealed that the ARGP based signature performed more accurately in overall survival (OS) prediction compared to other published gene signatures. In addition, a high risk of HCC was closely related to CTLA4 upregulation, LC3 downregulation, low-response to axitinib, rapamycin, temsirolimus, docetaxel, metformin, and high-response to bleomycin. Univariate Cox and multivariate Cox analysis revealed that the risk score was an independent prognostic factor for HCC. These results were internally validated in the test and TCGA sets and externally validated in the ICGC set. A nomogram, consisting of the risk score and the TNM stage, performed well when compared to an ideal nomogram. In conclusion, a 6-ARGP-based prognostic signature was identified and validated as an effective predictor of OS of patients with HCC. Furthermore, we recognized six small-molecule drugs, which may be potentially effective in treating HCC.
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Affiliation(s)
- ZeBing Song
- Department of Liver Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - GuoPei Zhang
- Department of Liver Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yang Yu
- Department of Liver Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - ShaoQiang Li
- Department of Liver Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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Altered Expression of ESR1, ESR2, PELP1 and c-SRC Genes Is Associated with Ovarian Cancer Manifestation. Int J Mol Sci 2021; 22:ijms22126216. [PMID: 34207568 PMCID: PMC8228770 DOI: 10.3390/ijms22126216] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/02/2021] [Accepted: 06/07/2021] [Indexed: 12/24/2022] Open
Abstract
Ovarian cancer remains the leading cause of death due to gynecologic malignancy. Estrogen-related pathways genes, such as estrogen receptors (ESR1 and ESR2) and their coregulators, proline-, glutamic acid-, and leucine-rich protein 1 (PELP1), and proto-oncogene tyrosine-protein kinase c-Src (SRC) are involved in ovarian cancer induction and development, still they require in-depth study. In our study, tissue samples were obtained from 52 females of Caucasian descent (control group without cancerous evidence (n = 27), including noncancerous benign changes (n = 15), and the ovarian carcinoma (n = 25)). Using quantitative analyses, we investigated ESRs, PELP1, and SRC mRNA expression association with ovarian tumorigenesis. Proteins’ presence and their location were determined by Western blot and immunohistochemistry. Results showed that PELP1 and SRC expression levels were found to differ in tissues of different sample types. The expression patterns were complex and differed in the case of ovarian cancer patients compared to controls. The most robust protein immunoreactivity was observed for PELP1 and the weakest for ESR1. The expression patterns of analyzed genes represent a potentially interesting target in ovarian cancer biology, especially PELP1. This study suggests that specific estrogen-mediated functions in the ovary and ovary-derived cancer might result from different local interactions of estrogen with their receptors and coregulators.
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Yan H, Sun Y, Wu Q, Wu Z, Hu M, Sun Y, Liu Y, Ma Z, Liu S, Xiao W, Liu F, Ning Z. PELP1 Suppression Inhibits Gastric Cancer Through Downregulation of c-Src-PI3K-ERK Pathway. Front Oncol 2020; 9:1423. [PMID: 32117782 PMCID: PMC7031343 DOI: 10.3389/fonc.2019.01423] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 11/29/2019] [Indexed: 01/08/2023] Open
Abstract
Background: Proline-, glutamic acid-, and leucine-rich protein 1 (PELP1), a co-activator of estrogen receptors alpha, was confirmed to be directly associated with the oncogenic process of multiple cancers, especially hormone-dependent cancers. The purpose of our research was to explore the biological function, clinical significance, and therapeutic targeted value of PELP1 in gastric cancer (GC). Methods: The expression status of PELP1 in GC cell lines or tissues was analyzed through bioinformatics data mining. Thirty-six GC tissue chip was applied to demonstrate the results of bioinformatics data mining assayed by immunohistochemical method. The expression status of PELP1 in GC cell lines was also analyzed using western blot. Correlation analysis between PELP1 expression and clinicopathological parameter was performed. Kaplan-Meier survival analysis was applied to analyze the relationship between PELP1 expression and total survival time. Three pairs of siRNA were designed to silence the expression of PELP1 in GC. After PELP1 was silenced by siRNA or activated by saRNA, the growth, plate colony formation, migration and invasion ability of the GC cell or normal gastric epithelium cell line was tested in vitro. Cell cycle was tested by flow cytometry. Nude mice xenograft experiment was performed after PELP1 was silenced. The downstream molecular pathway regulated by PELP1 was explored. Molecular docking tool was applied to combine chlorpromazine with PELP1. The inhibitory effect of chlorpromazine in GC was assayed, then it was tested whether PELP1 was a therapeutic target of chlorpromazine in GC. Results: PELP1 expression was elevated in GC cell lines and clinical GC tissue samples. PELP1 silence by siRNA compromised the malignant traits of GC. PELP1 expression positively correlated with tumor invasion depth, lymph node metastasis, tissue grade, TNM stage, but had no correlation with patient age, sex, tumor size, and tumor numbers. Kaplan-Meier survival analysis revealed high PELP1 expression had a shorter survival period in GC patients after follow-up. Q-PCR and western blot revealed PELP1 suppression in GC decreased expression of the c-Src-PI3K-ERK pathway. It was also implied that chlorpromazine (CPZ) can inhibit the malignant traits of GC and downregulate the expression of PELP1. Conclusions: In a word, PELP1 is an oncogene in gastric cancer and c-Src-PI3K-ERK pathway activation may be responsible for its tumorigenesis, PELP1 may be a potential therapeutic target of chlorpromazine in GC.
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Affiliation(s)
- Hongzhu Yan
- Basic Medical School, Hubei University of Science and Technology, Xianning, China.,Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, China
| | - Yanling Sun
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Qian Wu
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Zhe Wu
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Meichun Hu
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Yuanpeng Sun
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Yusi Liu
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Zi Ma
- Wuhan University Zhongnan Hospital, Wuhan, China
| | - Shangqin Liu
- Wuhan University Zhongnan Hospital, Wuhan, China
| | - Wuhan Xiao
- The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Fuxing Liu
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
| | - Zhifeng Ning
- Basic Medical School, Hubei University of Science and Technology, Xianning, China
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Luo Y, Li M, Pratap UP, Viswanadhapalli S, Liu J, Venkata PP, Altwegg KA, Palacios BE, Li X, Chen Y, Rao MK, Brenner AJ, Sareddy GR, Vadlamudi RK. PELP1 signaling contributes to medulloblastoma progression by regulating the NF-κB pathway. Mol Carcinog 2019; 59:281-292. [PMID: 31872914 DOI: 10.1002/mc.23152] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/03/2019] [Accepted: 12/14/2019] [Indexed: 12/20/2022]
Abstract
Medulloblastoma (MB) is the most common and deadliest brain tumor in children. Proline-, glutamic acid-, and leucine-rich protein 1 (PELP1) is a scaffolding protein and its oncogenic signaling is implicated in the progression of several cancers. However, the role of PELP1 in the progression of MB remains unknown. The objective of this study is to examine the role of PELP1 in the progression of MB. Immunohistochemical analysis of MB tissue microarrays revealed that PELP1 is overexpressed in the MB specimens compared to normal brain. Knockdown of PELP1 reduced cell proliferation, cell survival, and cell invasion of MB cell lines. The RNA-sequencing analysis revealed that PELP1 knockdown significantly downregulated the pathways related to inflammation and extracellular matrix. Gene set enrichment analysis confirmed that the PELP1-regulated genes were negatively correlated with nuclear factor-κB (NF-κB), extracellular matrix, and angiogenesis gene sets. Interestingly, PELP1 knockdown reduced the expression of NF-κB target genes, NF-κB reporter activity, and inhibited the nuclear translocation of p65. Importantly, the knockdown of PELP1 significantly reduced in vivo MB progression in orthotopic models and improved the overall mice survival. Collectively, these results suggest that PELP1 could be a novel target for therapeutic intervention in MB.
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Affiliation(s)
- Yiliao Luo
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Department of General Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China.,Department of Neurosurgery, The Second Xiangya Hospital, Xiangya School of Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Mengxing Li
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Department of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Uday P Pratap
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas
| | | | - Junhao Liu
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Prabhakar P Venkata
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas
| | - Kristin A Altwegg
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Mays Cancer Center, Cancer Development and Progression Program, University of Texas Health San Antonio, San Antonio, Texas
| | - Bridgitte E Palacios
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas
| | - Xiaonan Li
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas
| | - Yihong Chen
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Manjeet K Rao
- Mays Cancer Center, Cancer Development and Progression Program, University of Texas Health San Antonio, San Antonio, Texas.,Department of Cell Systems and Anatomy, University of Texas Health San Antonio, San Antonio, Texas
| | - Andrew J Brenner
- Mays Cancer Center, Cancer Development and Progression Program, University of Texas Health San Antonio, San Antonio, Texas.,Department of Hematology and Oncology, University of Texas Health San Antonio, San Antonio, Texas
| | - Gangadhara R Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Mays Cancer Center, Cancer Development and Progression Program, University of Texas Health San Antonio, San Antonio, Texas
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health San Antonio, San Antonio, Texas.,Mays Cancer Center, Cancer Development and Progression Program, University of Texas Health San Antonio, San Antonio, Texas
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8
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Wang L, Li K, Lin X, Yao Z, Wang S, Xiong X, Ning Z, Wang J, Xu X, Jiang Y, Liu D, Chen Y, Zhang D, Zhang H. Metformin induces human esophageal carcinoma cell pyroptosis by targeting the miR-497/PELP1 axis. Cancer Lett 2019; 450:22-31. [PMID: 30771436 DOI: 10.1016/j.canlet.2019.02.014] [Citation(s) in RCA: 153] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/01/2019] [Accepted: 02/08/2019] [Indexed: 02/05/2023]
Abstract
Evasion of apoptosis is a major contributing factor to the development of chemo- and radiotherapy resistance. Therefore, activation of non-apoptotic programmed cell death (PCD) could be an effective alternative against apoptosis-resistant cancers. In this study, we demonstrated in vitro and in vivo that metformin can induce pyroptosis, a non-apoptotic PCD, in esophageal squamous cell carcinoma (ESCC), a commonly known chemo-refractory cancer, especially at its advanced stages. Proline-, glutamic acid- and leucine-rich protein-1 (PELP1) is a scaffolding oncogene and upregulated PELP1 in advanced stages of ESCC is highly associated with cancer progression and patient outcomes. Intriguingly, metformin treatment leads to gasdermin D (GSDMD)-mediated pyroptosis, which is abrogated by forced expression of PELP1. Mechanistically, metformin induces pyroptosis of ESCC by targeting miR-497/PELP1 axis. Our findings suggest that metformin and any other pyroptosis-inducing reagents could serve as alternative treatments for chemo- and radiotherapy refractory ESCC or other cancers sharing the same pyroptosis mechanisms.
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Affiliation(s)
- Lu Wang
- Department of Gastrointestinal Oncology, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China; Institute of Precision Cancer Medicine and Pathology, Jinan University Medical College, Guangzhou, China; Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Kai Li
- Department of Gastrointestinal Oncology, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China; Institute of Precision Cancer Medicine and Pathology, Jinan University Medical College, Guangzhou, China; Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Xianjie Lin
- Department of Gastrointestinal Oncology, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China; Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Zhimeng Yao
- Department of Gastrointestinal Oncology, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China; Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Shuhong Wang
- Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Xiao Xiong
- Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Zhifeng Ning
- Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Jing Wang
- Department of Thoracic Surgery, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Xiaozheng Xu
- Cancer Research Centre, Shantou University Medical College, Shantou, Guangdong, China
| | - Yi Jiang
- Department of Gastrointestinal Oncology, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Ditian Liu
- Department of Thoracic Surgery, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Yuping Chen
- Department of Thoracic Surgery, Affiliated Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Dianzheng Zhang
- Department of Bio-Medical Sciences, Philadelphia College of Osteopathic Medicine, 4170 City Ave, Philadelphia, PA, 19131, USA
| | - Hao Zhang
- Institute of Precision Cancer Medicine and Pathology, Department of Pathology, Jinan University Medical College, Guangzhou, China; Research Centre of Translational Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China.
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9
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Wang X, Tsang JYS, Lee MA, Ni YB, Tong JH, Chan SK, Cheung SY, To KF, Tse GM. The Clinical Value of PELP1 for Breast Cancer: A Comparison with Multiple Cancers and Analysis in Breast Cancer Subtypes. Cancer Res Treat 2018; 51:706-717. [PMID: 30134648 PMCID: PMC6473277 DOI: 10.4143/crt.2018.316] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 08/21/2018] [Indexed: 12/27/2022] Open
Abstract
Purpose Proline, glutamic acid, and leucine-rich protein 1 (PELP1), a novel nuclear receptor (NR) co-regulator, is highly expressed in breast cancer. We investigated its expression in breast cancer subtypes, in comparison with other breast markers as well as cancers from different sites. Its prognostic relevance with different subtypes and other NR expression was also examined in breast cancers. Methods Immunohistochemical analysis was performed on totally 1,944 cancers from six different organs. Results PELP1 expression rate was the highest in breast cancers (70.5%) among different cancers. Compared to GATA3, mammaglobin and gross cystic disease fluid protein 15, PELP1 was less sensitive than GATA3 for luminal cancers, but was the most sensitive for non-luminal cancers. PELP1 has low expression rate (<20%) in colorectal cancers, gastric cancers and renal cell carcinomas, but higher in lung cancers (49.1%) and ovarian cancers (42.3%). In breast cancer, PELP1 expression was an independent adverse prognostic factor for non-luminal cancers (disease-free survival [DFS]: hazard ratio [HR], 1.403; p=0.012 and breast cancer specific survival [BCSS]: HR, 1.443; p=0.015). Interestingly, its expression affected the prognostication of androgen receptor (AR). ARposPELP1lo luminal cancer showed the best DFS (log-rank=8.563, p=0.036) while ARnegPELP1hi non-luminal cancers showed the worst DFS (log-rank=9.536, p=0.023). Conclusion PELP1 is a sensitive marker for breast cancer, particularly non-luminal cases. However, its considerable expression in lung and ovarian cancers may limit its utility in differential diagnosis in some scenarios. PELP1 expression was associated with poor outcome in non-luminal cancers and modified the prognostic effects of AR, suggesting the potential significance of NR co-regulator in prognostication.
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Affiliation(s)
- Xingen Wang
- Department of Pathology, Peking University Shenzhen Hospital, Shenzhen, China
| | - Julia Y S Tsang
- Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
| | - Michelle A Lee
- Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
| | - Yun-Bi Ni
- Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
| | - Joanna H Tong
- Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
| | - Siu-Ki Chan
- Department of Pathology, Kwong Wah Hospital, Hong Kong
| | | | - Ka Fai To
- Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
| | - Gary M Tse
- Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
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10
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Thakkar R, Sareddy GR, Zhang Q, Wang R, Vadlamudi RK, Brann D. PELP1: a key mediator of oestrogen signalling and actions in the brain. J Neuroendocrinol 2018; 30:10.1111/jne.12484. [PMID: 28485080 PMCID: PMC5785553 DOI: 10.1111/jne.12484] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 05/02/2017] [Accepted: 05/03/2017] [Indexed: 02/06/2023]
Abstract
Proline-, glutamic acid- and leucine-rich protein 1 (PELP1) is an oestrogen receptor (ER) coregulator protein identified by our collaborative group. Work from our laboratory and others has shown that PELP1 is a scaffold protein that interacts with ERs and kinase signalling factors, as well as proteins involved in chromatin remodelling and DNA repair. Its role in mediating 17β-oestradiol (E2 ) signalling and actions has been studied in detail in cancer cells, although only recently has attention turned to its role in the brain. In this review, we discuss the tissue, cellular and subcellular localisation of PELP1 in the brain. We also discuss recent evidence from PELP1 forebrain-specific knockout mice demonstrating a critical role of PELP1 in mediating both extranuclear and nuclear ER signalling in the brain, as well as E2 -induced neuroprotection, anti-inflammatory effects and regulation of cognitive function. Finally, the PELP1 interactome and unique gene network regulated by PELP1 in the brain is discussed, especially because it provides new insights into PELP1 biology, protein interactions and mechanisms of action in the brain. As a whole, the findings discussed in the present review indicate that PELP1 functions as a critical ER coregulator in the brain to mediate E2 signalling and actions.
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Affiliation(s)
- Roshni Thakkar
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA
| | - Gangadhara Reddy Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, TX
| | - Quanguang Zhang
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA
| | - Ruimin Wang
- Department of Neurobiology, North China University of Science and Technology, Tangshan, Hebei, China
| | - Ratna K. Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio, TX
| | - Darrell Brann
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA
- Corresponding Author: Dr. Darrell Brann, Regents’ Professor and Vice Chair, Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, 1120 15 Street, CA-4004, Augusta, GA 30912, USA. Phone: 1-706-721-7779
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11
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PELP1: Structure, biological function and clinical significance. Gene 2016; 585:128-134. [PMID: 26997260 DOI: 10.1016/j.gene.2016.03.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 03/05/2016] [Accepted: 03/08/2016] [Indexed: 01/10/2023]
Abstract
Proline-, glutamic acid-, and leucine-rich protein 1 (PELP1) is a scaffolding protein that functions as a coregulator of several transcription factors and nuclear receptors. Notably, the PELP1 protein has a histone-binding domain, recognizes histone modifications and interacts with several chromatin-modifying complexes. PELP1 serves as a substrate of multitude of kinases, and phosphorylation regulates its functions in various complexes. Further, PELP1 plays essential roles in several pathways including hormonal signaling, cell cycle progression, ribosomal biogenesis, and the DNA damage response. PELP1 expression is upregulated in several cancers, its deregulation contributes to therapy resistance, and it is a prognostic biomarker for breast cancer survival. Recent evidence suggests that PELP1 represents a novel therapeutic target for many hormonal cancers. In this review, we summarized the emerging biological properties and functions of PELP1.
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12
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Zhang W, Liu R, Tang C, Xi Q, Lu S, Chen W, Zhu L, Cheng J, Chen Y, Wang W, Zhong J, Deng Y. PFTK1 regulates cell proliferation, migration and invasion in epithelial ovarian cancer. Int J Biol Macromol 2016; 85:405-16. [PMID: 26772918 DOI: 10.1016/j.ijbiomac.2016.01.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 12/31/2015] [Accepted: 01/03/2016] [Indexed: 02/04/2023]
Abstract
PFTK1, also named Cyclin-Dependent Kinase 14 (CDK14), is a member of the cell division cycle 2 (CDC2)-related protein kinase family. It is a serine/threonine-protein kinase involved in the regulation of cell cycle progression and cell proliferation. In this study, we investigated the role of PFTK1 in epithelial ovarian cancer (EOC) development. The expression of PFTK1 was detected by Western blot and immunohistochemistry staining, both of which demonstrated that PFTK1 was overexpressed in EOC tissues and cells. Statistical analysis showed the expression of PFTK1 was associated with multiple clinicopathological factors, including tumor grade, FIGO stage, lymph node metastatis, Ki-67 expression and predicted a poor prognosis of EOC patients. With in vitro studies we found that PFTK1 expression was decreased in serum-starved ovarian cancer cells, and progressively increased after serum-re-feeding. Knocking PFTK1 down by small interfering RNA (siRNA) significantly inhibited ovarian cancer cell proliferation, migration and invasion. Taken together, our study suggested that PFTK1 played an important role in ovarian cancer development.
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Affiliation(s)
- Weiwei Zhang
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Rong Liu
- Department of Gynecologic Oncology, Nantong University Cancer Hospital, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Chunhui Tang
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Qinghua Xi
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Shumin Lu
- Department of Oncology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Wenjuan Chen
- Department of Oncology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Lianxin Zhu
- Department of General Surgery, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Jialin Cheng
- Department of Oncology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Yannan Chen
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Wei Wang
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China
| | - Jianxin Zhong
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China.
| | - Yan Deng
- Department of Obstetrics and Gynecology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, People's Republic of China.
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13
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Ravindranathan P, Lange CA, Raj GV. Minireview: Deciphering the Cellular Functions of PELP1. Mol Endocrinol 2015; 29:1222-9. [PMID: 26158753 DOI: 10.1210/me.2015-1049] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- Preethi Ravindranathan
- Department of Urology (P.R., G.V.R.), University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390; and Departments of Medicine and Pharmacology (C.A.L.), University of Minnesota, Masonic Cancer Center, Minneapolis, Minnesota 55455
| | - Carol A Lange
- Department of Urology (P.R., G.V.R.), University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390; and Departments of Medicine and Pharmacology (C.A.L.), University of Minnesota, Masonic Cancer Center, Minneapolis, Minnesota 55455
| | - Ganesh V Raj
- Department of Urology (P.R., G.V.R.), University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390; and Departments of Medicine and Pharmacology (C.A.L.), University of Minnesota, Masonic Cancer Center, Minneapolis, Minnesota 55455
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14
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Słowikowski BK, Gałęcki B, Dyszkiewicz W, Jagodziński PP. Increased expression of proline-, glutamic acid- and leucine-rich protein PELP1 in non-small cell lung cancer. Biomed Pharmacother 2015. [PMID: 26211588 DOI: 10.1016/j.biopha.2015.05.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
It has been demonstrated that estrogens are able to enhance lung tumorigenesis by estrogen receptor (ER) pathway. ER signaling is a highly complex process that requires a number of different coactivators, including proline-, glutamic acid- and leucine-rich protein-1 (PELP1). We studied PELP1 transcript and protein levels in cancerous and histopathologically unchanged lung tissues obtained from 73 patients diagnosed with non-small cell lung cancer (NSCLC). We observed increased levels of PELP1 transcript (P=0.00001) and protein (P=0.00001) in tumor tissues compared to adjacent histopathologically unchanged tissues. Significant increase of PELP1 transcript/protein level was found in all patients, regardless of gender (males: P=0.0003/P=0.000003; females: P=0.0005/P=0.02), age (≤ 60 patients: P=0.042/P=0.016; >60 patients: P=0.00001/P=0.00001) or histopathological type of tumor (adenocarcinoma [ADC]: P=0.004/P=0.0006; squamous cell carcinoma [SSC]: P=0.0009/P=0.0008). Increased PELP1 transcript/protein levels were also correlated with some lung cancer stage (1a: P=0.07/P=0.02; 1b: P=0.001/P=0.03; 2a: P=0.012/P=0.001), tumor size (T2a: P=0.0006/P=0.001) and lymph node metastasis (N0: P=0.0003/P=0.0006; N1: P=0.017/P=0.003). Moreover, significant increase in PELP1 transcript level in cancer stage 1a (P=0.02) was observed. PELP1 protein content was higher in tumor tissues of patients with cancer stage 3a (P=0.04) and in T1a tumor size (P=0.03). Our studies demonstrate significantly higher amounts of PELP1 transcript and protein in tumor tissues in patients with NSCLC. Moreover, we also determined the association of PELP1 transcript and protein level with some clinicopathological features of NSCLC.
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Affiliation(s)
- Bartosz Kazimierz Słowikowski
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, 6, Święcickiego Street, 60-781 Poznań, Poland
| | - Bartłomiej Gałęcki
- Department of Thoracic Surgery, Poznań University of Medical Sciences, 62, Szamarzewskiego Street, 60-569 Poznań, Poland
| | - Wojciech Dyszkiewicz
- Department of Thoracic Surgery, Poznań University of Medical Sciences, 62, Szamarzewskiego Street, 60-569 Poznań, Poland
| | - Paweł Piotr Jagodziński
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, 6, Święcickiego Street, 60-781 Poznań, Poland.
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15
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Gonugunta VK, Miao L, Sareddy GR, Ravindranathan P, Vadlamudi R, Raj GV. The social network of PELP1 and its implications in breast and prostate cancers. Endocr Relat Cancer 2014; 21:T79-86. [PMID: 24859989 DOI: 10.1530/erc-13-0502] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Proline, glutamic acid- and leucine-rich protein 1 (PELP1) is a multi-domain scaffold protein that serves as a platform for various protein-protein interactions between steroid receptors (SRs) and signaling factors and cell cycle, transcriptional, cytoskeletal, and epigenetic remodelers. PELP1 is known to be a coregulator of transcription and participates in the nuclear and extranuclear functions of SRs, ribosome biogenesis, and cell cycle progression. The expression and localization of PELP1 are dysregulated in hormonal cancers including breast and prostate cancers. This review focuses on the interactive functions and therapeutic and prognostic significance of PELP1 in breast and prostate cancers.
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Affiliation(s)
- Vijay K Gonugunta
- Department of UrologyUT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard J8130, Dallas, Texas 75390, USADepartment of Obstetrics and GynecologyUT Health Science Center, San Antonio, Texas, USA
| | - Lu Miao
- Department of UrologyUT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard J8130, Dallas, Texas 75390, USADepartment of Obstetrics and GynecologyUT Health Science Center, San Antonio, Texas, USA
| | - Gangadhara R Sareddy
- Department of UrologyUT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard J8130, Dallas, Texas 75390, USADepartment of Obstetrics and GynecologyUT Health Science Center, San Antonio, Texas, USA
| | - Preethi Ravindranathan
- Department of UrologyUT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard J8130, Dallas, Texas 75390, USADepartment of Obstetrics and GynecologyUT Health Science Center, San Antonio, Texas, USA
| | - Ratna Vadlamudi
- Department of UrologyUT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard J8130, Dallas, Texas 75390, USADepartment of Obstetrics and GynecologyUT Health Science Center, San Antonio, Texas, USA
| | - Ganesh V Raj
- Department of UrologyUT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard J8130, Dallas, Texas 75390, USADepartment of Obstetrics and GynecologyUT Health Science Center, San Antonio, Texas, USA
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16
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PELP1 suppression inhibits colorectal cancer through c-Src downregulation. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:193523. [PMID: 24967003 PMCID: PMC4055551 DOI: 10.1155/2014/193523] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 04/20/2014] [Indexed: 01/16/2023]
Abstract
Proline-, glutamic acid-, and leucine-rich protein 1 (PELP1), a coregulator of estrogen receptors alpha and beta, is a potential protooncogene implicated in several human cancers, including sexual hormone-responsive or sexual hormone-nonresponsive cancers. However, the functions of PELP1 in colorectal cancer remain unclear. In this study, western blot and bioinformatics revealed that PELP1 expression was higher in several colorectal cancer cell lines than in immortalized normal colorectal epithelium. PELP1 silencing by short hairpin RNA promoted the senescence and inhibited the proliferation, colony formation, migration, invasion, and xenograft tumor formation of the CRC cell line HT-29. Moreover, PELP1 silencing was accompanied by c-Src downregulation. c-Src upregulation partly alleviated the damage in HT-29 malignant behavior induced by PELP1 RNA interference. In conclusion, PELP1 exhibits an oncogenic function in colorectal cancer through c-Src upregulation.
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17
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The histone variant MacroH2A1 regulates target gene expression in part by recruiting the transcriptional coregulator PELP1. Mol Cell Biol 2014; 34:2437-49. [PMID: 24752897 DOI: 10.1128/mcb.01315-13] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
MacroH2A1 is a histone variant harboring an ∼25-kDa carboxyl-terminal macrodomain. Due to its enrichment on the inactive X chromosome, macroH2A1 was thought to play a role in transcriptional repression. However, recent studies have shown that macroH2A1 occupies autosomal chromatin and regulates genes in a context-specific manner. The macrodomain may play a role in the modulation of gene expression outcomes via physical interactions with effector proteins, which may depend on the ability of the macrodomain to bind NAD(+) metabolite ligands. Here, we identify proline, glutamic acid, and leucine-rich protein 1 (PELP1), a chromatin-associated factor and transcriptional coregulator, as a ligand-independent macrodomain-interacting factor. We used chromatin immunoprecipitation coupled with tiling microarrays (ChIP-chip) to determine the genomic localization of PELP1 in MCF-7 human breast cancer cells. We find that PELP1 genomic localization is highly correlated with that of macroH2A1. Additionally, PELP1 positively correlates with heterochromatic chromatin marks and negatively correlates with active transcription marks, much like macroH2A1. MacroH2A1 specifically recruits PELP1 to the promoters of macroH2A1 target genes, but macroH2A1 occupancy occurs independent of PELP1. This recruitment allows macroH2A1 and PELP1 to cooperatively regulate gene expression outcomes.
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Gonugunta VK, Sareddy GR, Krishnan SR, Cortez V, Roy SS, Tekmal RR, Vadlamudi RK. Inhibition of mTOR signaling reduces PELP1-mediated tumor growth and therapy resistance. Mol Cancer Ther 2014; 13:1578-88. [PMID: 24688046 DOI: 10.1158/1535-7163.mct-13-0877] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Proline, Glutamic acid-, and Leucine-rich Protein 1 (PELP1) is a proto-oncogene that modulates estrogen receptor (ER) signaling. PELP1 expression is upregulated in breast cancer, contributes to therapy resistance, and is a prognostic marker of poor survival. In a subset of breast tumors, PELP1 is predominantly localized in the cytoplasm and PELP1 participates in extranuclear signaling by facilitating ER interactions with Src and phosphoinositide 3-kinase (PI3K). However, the mechanism by which PELP1 extranuclear actions contributes to cancer progression and therapy resistance remains unclear. In this study, we discovered that PELP1 cross-talked with the serine/threonine protein kinase mTOR and modulated mTOR signaling. PELP1 knockdown significantly reduced the activation of mTOR downstream signaling components. Conversely, PELP1 overexpression excessively activated mTOR signaling components. We detected the presence of the mTOR signaling complex proteins in PELP1 immunoprecipitates. mTOR-targeting drugs (rapamycin and AZD8055) significantly reduced proliferation of PELP1-overexpressed breast cancer cells in both in vitro and in vivo xenograft tumor models. MCF7 cells that uniquely retain PELP1 in the cytoplasm showed resistance to hormonal therapy and mTOR inhibitors sensitized PELP1cyto cells to hormonal therapy in xenograft assays. Notably, immunohistochemical studies using xenograft tumors derived from PELP1 overexpression model cells showed increased mTOR signaling and inhibition of mTOR rendered PELP1-driven tumors to be highly sensitive to therapeutic inhibition. Collectively, our data identified the PELP1-mTOR axis as a novel component of PELP1 oncogenic functions and suggest that mTOR inhibitor(s) will be effective chemotherapeutic agents for downregulating PELP1 oncogenic functions.
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Affiliation(s)
- Vijay K Gonugunta
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Gangadhara R Sareddy
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Samaya Rajeshwari Krishnan
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Valerie Cortez
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Sudipa Saha Roy
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Rajeshwar Rao Tekmal
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Ratna K Vadlamudi
- Authors' Affiliation: Department of Obstetrics and Gynecology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
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The pattern of proline, glutamic acid, and leucine-rich protein 1 expression in Chinese women with primary breast cancer. Int J Biol Markers 2014; 29:e1-7. [PMID: 24627205 DOI: 10.5301/jbm.5000078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/28/2014] [Indexed: 11/20/2022]
Abstract
BACKGROUND Disparities of biomarkers' expression in breast cancer across different races and ethnicities have been well documented. Proline, glutamic acid, and leucine-rich protein 1 (PELP1), a novel ER coregulator, has been considered as a promising biomarker of breast cancer prognosis; however, the pattern of PELP1 expression in Chinese women with breast cancer has never been investigated. This study aims to provide useful reference on possible racial or ethnic differences of PELP1 expression in breast cancer by exploring the pattern of PELP1 expression in Chinese women with primary breast cancer. METHODS The expression of PELP1 in primary breast cancer samples from 130 Chinese female patients was detected by immunohistochemistry and correlated to other clinicopathological parameters; for comparison, the expression of PELP1 in 26 benign breast fibroadenomas was also examined. RESULTS The overall value of the PELP1 H-score in breast cancer was significantly higher than that in breast fibroadenoma (p<0.001). In our breast cancer patients, the ER/HER-2-positive group had significantly higher PELP1 H-scores than their negative counterparts (p=0.003 for ER and p=0.022 for HER-2); the Ki-67-high group also showed significantly higher PELP1 H-scores than the Ki-67-low group (p=0.008). No significant association between PELP1 H-scores and other clinicopathological parameters was found. Finally, the PELP1 H-score in breast cancers of the luminal B subtype was significantly higher than that in the triple negative subtype (p=0.002). CONCLUSION Overexpression of PELP1 in Chinese women with primary breast cancer appears to be associated with biomarkers of poor outcome; these results are similar to other reports based on Western populations.
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Girard BJ, Daniel AR, Lange CA, Ostrander JH. PELP1: a review of PELP1 interactions, signaling, and biology. Mol Cell Endocrinol 2014; 382:642-651. [PMID: 23933151 PMCID: PMC3844065 DOI: 10.1016/j.mce.2013.07.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 07/29/2013] [Accepted: 07/29/2013] [Indexed: 11/29/2022]
Abstract
Proline, glutamic acid, and leucine rich protein 1 (PELP1) is a large multi-domain protein that has been shown to modulate an increasing number of pathways and biological processes. The first reports describing the cloning and characterization of PELP1 showed that it was an estrogen receptor coactivator. PELP1 has now been shown to be a coregulator for a growing number of transcription factors. Furthermore, recent reports have shown that PELP1 is a member of chromatin remodeling complexes. In addition to PELP1 nuclear functions, it has been shown to have cytoplasmic signaling functions as well. In the cytoplasm PELP1 acts as a scaffold molecule and mediates rapid signaling from growth factor and hormone receptors. PELP1 signaling ultimately plays a role in cancer biology by increasing proliferation and metastasis, among other cellular processes. Here we will review (1) the cloning and characterization of PELP1 expression, (2) interacting proteins, (3) PELP1 signaling, and (4) PELP1-mediated biology.
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Affiliation(s)
- Brian J Girard
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, United States
| | - Andrea R Daniel
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, United States
| | - Carol A Lange
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, United States
| | - Julie H Ostrander
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, United States.
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Park MA, Choi KC. Effects of 4-nonylphenol and bisphenol A on stimulation of cell growth via disruption of the transforming growth factor-β signaling pathway in ovarian cancer models. Chem Res Toxicol 2013; 27:119-28. [PMID: 24308608 DOI: 10.1021/tx400365z] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Transforming growth factor β (TGF-β) signaling pathway is a major pathway in cellular processes such as cell growth, apoptosis, and cellular homeostasis. The signaling pathway activated by 17β-estadiol (E2) appeared to inhibit the TGF-β signaling pathway by cross-talk with the TGF-β components in estrogen receptor (ER) positive cells. In this study, we examined the inhibitory effects of endocrine disrupting chemicals (EDCs), including 4-nonylphenol (NP), 4-otylphenol (OP), bisphenol A (BPA), and benzophenon-1 (BP-1), in the TGF-β signaling pathway in BG-1 ovarian cancer cells expressing estrogen receptors (ERs). The transcriptional and translational levels of TGF-β related genes were examined by reverse transcription-PCR (RT-PCR), Western blot analysis, and xenograft mouse models of ovarian cancer cells. As a result, treatment with NP, OP, and BPA induced the expressions of SnoN, a TGF-β pathway inhibitor, and c-Fos, a TGF-β target transcription factor. Treatment with NP, BPA, and BP-1 resulted in decreased phosphorylation of Smad3, a downstream target of TGF-β. These results indicate that NP and BPA may stimulate the proliferation of BG-1 cells via inhibition of the TGF-β signaling pathway. In a xenograft mouse model, transplanted BG-1 ovarian cancer cells showed significantly decreased phosphorylation of Smad3 and increased expression of SnoN in the ovarian tumor masses following treatment with E2, NP, or BPA. In parallel with an in vitro model, the expressions of these TGF-β signaling pathway were similarly regulated by NP or BPA in a xenograft mouse model. These results support the fact that the existence of an unproven relationship between EDCs/ER-α and TGF-β signaling pathway and a further study are required in order to verify more profound and distinct mechanism(s) for the disturbance of the TGF-β signaling pathway by diverse EDCs.
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Affiliation(s)
- Min-Ah Park
- Laboratory of Veterinary Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University , Cheongju, Chungbuk 361-763, Republic of Korea
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22
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Antoon JW, Martin EC, Lai R, Salvo VA, Tang Y, Nitzchke AM, Elliott S, Nam SY, Xiong W, Rhodes LV, Collins-Burow B, David O, Wang G, Shan B, Beckman BS, Nephew KP, Burow ME. MEK5/ERK5 signaling suppresses estrogen receptor expression and promotes hormone-independent tumorigenesis. PLoS One 2013; 8:e69291. [PMID: 23950888 PMCID: PMC3739787 DOI: 10.1371/journal.pone.0069291] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Accepted: 06/12/2013] [Indexed: 01/20/2023] Open
Abstract
Endocrine resistance and metastatic progression are primary causes of treatment failure in breast cancer. While mitogen activated protein kinases (MAPKs) are known to promote ligand-independent cell growth, the role of the MEK5-ERK5 pathway in the progression of clinical breast carcinoma remains poorly understood. Here, we demonstrated increased ERK5 activation in 30 of 39 (76.9%) clinical tumor samples, as well as across breast cancer cell systems. Overexpression of MEK5 in MCF-7 cells promoted both hormone-dependent and hormone-independent tumorigenesis in vitro and in vivo and conferred endocrine therapy resistance to previously sensitive breast cancer cells. Expression of MEK5 suppressed estrogen receptor (ER)α, but not ER-β protein levels, and abrogated downstream estrogen response element (ERE) transcriptional activity and ER-mediated gene transcription. Global gene expression changes associated with upregulation of MEK5 included increased activation of ER-α independent growth signaling pathways and promotion of epithelial-to-mesenchymal transition (EMT) markers. Taken together, our findings show that the MEK5-ERK5 pathway mediates progression to an ER(-), mesenchymal and endocrine therapy resistant phenotype. Given the need for new clinical therapeutic targets, our results demonstrate the therapeutic potential of targeting the MEK5-ERK5 pathway in breast cancer.
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Affiliation(s)
- James W. Antoon
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Elizabeth C. Martin
- Department of Medicine, Section of Hematology & Medical Oncology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Rongye Lai
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Bloomington, Indiana, United States of America
| | - Virgilo A. Salvo
- Department of Medicine, Section of Hematology & Medical Oncology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Yan Tang
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Ashley M. Nitzchke
- Department of Medicine, Section of Hematology & Medical Oncology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Steven Elliott
- Department of Medicine, Section of Hematology & Medical Oncology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Seung Yoon Nam
- Department of Chemistry, Xavier University, New Orleans, Louisiana, United States of America
| | - Wei Xiong
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Lyndsay V. Rhodes
- Department of Medicine, Section of Hematology & Medical Oncology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Bridgette Collins-Burow
- Department of Medicine, Section of Hematology & Medical Oncology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Odile David
- Department of Pathology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Guandi Wang
- Department of Chemistry, Xavier University, New Orleans, Louisiana, United States of America
| | - Bin Shan
- Department of Pulmonary Diseases, Critical Care, and Environmental Medicine, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Barbara S. Beckman
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
| | - Kenneth P. Nephew
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Bloomington, Indiana, United States of America
| | - Matthew E. Burow
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States of America
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Aust S, Horak P, Pils D, Pils S, Grimm C, Horvat R, Tong D, Schmid B, Speiser P, Reinthaller A, Polterauer S. The prognostic value of estrogen receptor beta and proline-, glutamic acid- and leucine-rich protein 1 (PELP1) expression in ovarian cancer. BMC Cancer 2013; 13:115. [PMID: 23497172 PMCID: PMC3605348 DOI: 10.1186/1471-2407-13-115] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 03/06/2013] [Indexed: 01/31/2023] Open
Abstract
Background Proline-, glutamic acid-, and leucine-rich protein 1 (PELP1), a coregulator of the estrogen receptors (ERs) alpha and beta, is a potential proto-oncogene in hormone dependent gynecological malignancies. To better understand the role of PELP1 in epithelial ovarian cancer (EOC), the protein expression and prognostic significance of PELP1 was evaluated together with ERalpha and ERbeta in EOC tissues. Methods The expression of PELP1, ERalpha, and ERbeta was characterized in tumor tissues of 63 EOC patients. The prognostic value was calculated performing log-rank tests and multivariate Cox-Regression analysis. In a second step, validation analysis in an independent set of 86 serous EOC patients was performed. Results Nuclear PELP1 expression was present in 76.2% of the samples. Prevalence of PELP1 expression in mucinous tumors was significantly lower (37.5%) compared to serous (85.7%) and endometrioid tumors (86.7%). A significant association between PELP1 expression and nuclear ERbeta staining was found (p=0.01). Positive PELP1 expression was associated with better disease-free survival (DFS) (p=0.004) and overall survival (OS) (p=0.04). The combined expression of ERbeta+/PELP1+ revealed an independent association with better DFS (HR 0.3 [0.1-0.7], p=0.004) and OS (HR 0.3 [0.1-0.7], p=0.005). In the validation set, the combined expression of ERbeta+/PELP1+ was not associated with DFS (HR 0.7 [0.4-1.3], p=0.3) and OS (HR 0.7 [0.3-1.4], p=0.3). Conclusion Positive immunohistochemical staining for the ER coregulator PELP1, alone and in combination with ERbeta, might be of prognostic relevance in EOC.
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Affiliation(s)
- Stefanie Aust
- Department of Gynaecology and Gynaecological Oncology, Comprehensive Cancer Center, Medical University of Vienna, Vienna, 1090, Austria
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Wan J, Li X. PELP1/MNAR suppression inhibits proliferation and metastasis of endometrial carcinoma cells. Oncol Rep 2012; 28:2035-42. [PMID: 22992812 DOI: 10.3892/or.2012.2038] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 07/17/2012] [Indexed: 11/06/2022] Open
Abstract
Proline-, glutamic acid- and leucine-rich protein-1/modulator of non-genomic activity of estrogen receptor (ER) (PELP1/MNAR) is a novel nuclear receptor (NR) co-activator that plays an essential role in the actions of ER. Emerging findings suggest that PELP1/MNAR is a novel proto-oncogene, whose expression is deregulated in several hormone-responsive cancers, including endometrial cancer. In this study, we demonstrate that PELP1/MNAR is widely expressed in endometrial carcinoma cell lines. To investigate its possible role in endometrial carcinoma progression, we adopted an RNA interference technology to downregulate PELP1/MNAR expression in Ishikawa endometrial carcinoma cells. PELP1/MNAR downregulation substantially reduced cell proliferation, and the cells in which PELP1/MNAR expression was knocked down also exhibited a decreased migration and invasion ability, as shown by Boyden chamber and invasion assays. The results showed that the expression of MMP-2 and MMP-9 was also decreased. These results suggest that PELP1/MNAR plays a role in endometrial cancer progression and metastasis, and that PELP1/MNAR may be a potential therapeutic target for endometrial cancer.
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Affiliation(s)
- Jing Wan
- Department of Gynecology and Obstetrics, The Third Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510630, PR China
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25
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McEwen BS, Akama KT, Spencer-Segal JL, Milner TA, Waters EM. Estrogen effects on the brain: actions beyond the hypothalamus via novel mechanisms. Behav Neurosci 2012; 126:4-16. [PMID: 22289042 DOI: 10.1037/a0026708] [Citation(s) in RCA: 199] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
From its origins in how the brain controls the endocrine system via the hypothalamus and pituitary gland, neuroendocrinology has evolved into a science that now includes hormone action on many aspects of brain function. These actions involve the whole central nervous system and not just the hypothalamus. Advances in our understanding of cellular and molecular actions of steroid hormones have gone beyond the important cell nuclear actions of steroid hormone receptors to include signaling pathways that intersect with other mediators such as neurotransmitters and neuromodulators. This has, in turn, broadened the search for and identification of steroid receptors to include nonnuclear sites in synapses, dendrites, mitochondria, and glial cells, as well as cell nuclei. The study of estrogen receptors and estrogen actions on processes related to cognition, mood, autonomic regulation, pain, and neuroprotection, among other functions, has led the way in this new view of hormone actions on the brain. In this review, we summarize past and current work in our laboratory on this topic. This exciting and growing field involving many laboratories continues to reshape our ideas and approaches to neuroendocrinology both at the bench and the bedside.
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Affiliation(s)
- Bruce S McEwen
- Laboratory of Neuroendocrinology, The Rockefeller University, Box 165, 1230 York Avenue, New York, NY 10065, USA.
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Yang L, Ravindranathan P, Ramanan M, Kapur P, Hammes SR, Hsieh JT, Raj GV. Central role for PELP1 in nonandrogenic activation of the androgen receptor in prostate cancer. Mol Endocrinol 2012; 26:550-61. [PMID: 22403175 DOI: 10.1210/me.2011-1101] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The ability of 17β-estradiol (E2) to regulate the proliferation of prostate cancer (PCa) cells in the absence of androgen is poorly understood. Here, we show the predominant estrogen receptor (ER) isoform expressed in PCa specimens and cell lines is ERβ. Our data indicate that E2 induces the formation of a complex between androgen receptor (AR), ERβ, and a proline-, glutamic acid-, and leucine-rich cofactor protein 1 (PELP1) in PCa cells. This protein complex is formed on AR's cognate DNA-responsive elements on the promoter in response to E2. Formation of this complex enables the transcription of AR-responsive genes in response to E2. Knockdown of PELP1, AR, or ERβ blocks the assembly of this complex, blocks E2-induced genomic activation of AR-regulated genes, and blocks E2-stimulated proliferation of PCa cells. Overall, this study shows that PELP1 may enable E2-induced AR signaling by forming a protein complex between AR, ERβ, and PELP1 on the DNA, leading to the proliferation of PCa cells in the absence of androgen. PELP1 may bridge the signal between E2 bound to ERβ and AR and thus allow for cross talk between these steroid receptors. These data suggest a novel mechanism of AR activation in the absence of androgens in PCa cells. Our data indicate that disruption of the complex between AR and PELP1 may be a viable therapeutic strategy in advanced PCa.
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Affiliation(s)
- Lin Yang
- Department of Urology, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9110, USA
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Roy S, Chakravarty D, Cortez V, De Mukhopadhyay K, Bandyopadhyay A, Ahn JM, Raj GV, Tekmal RR, Sun L, Vadlamudi RK. Significance of PELP1 in ER-negative breast cancer metastasis. Mol Cancer Res 2011; 10:25-33. [PMID: 22086908 DOI: 10.1158/1541-7786.mcr-11-0456] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Breast cancer metastasis is a major clinical problem. The molecular basis of breast cancer progression to metastasis remains poorly understood. PELP1 is an estrogen receptor (ER) coregulator that has been implicated as a proto-oncogene whose expression is deregulated in metastatic breast tumors and whose expression is retained in ER-negative tumors. We examined the mechanism and significance of PELP1-mediated signaling in ER-negative breast cancer progression using two ER-negative model cells (MDA-MB-231 and 4T1 cells) that stably express PELP1-shRNA. These model cells had reduced PELP1 expression (75% of endogenous levels) and exhibited less propensity to proliferate in growth assays in vitro. PELP1 downregulation substantially affected migration of ER-negative cells in Boyden chamber and invasion assays. Using mechanistic studies, we found that PELP1 modulated expression of several genes involved in the epithelial mesenchymal transition (EMT), including MMPs, SNAIL, TWIST, and ZEB. In addition, PELP1 knockdown reduced the in vivo metastatic potential of ER-negative breast cancer cells and significantly reduced lung metastatic nodules in a xenograft assay. These results implicate PELP1 as having a role in ER-negative breast cancer metastasis, reveal novel mechanism of coregulator regulation of metastasis via promoting cell motility/EMT by modulating expression of genes, and suggest PELP1 may be a potential therapeutic target for metastatic ER-negative breast cancer.
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Affiliation(s)
- Sudipa Roy
- Department of Obstetrics and Gynecology and Cancer Therapy & Research Center, UT Health Science Center, San Antonio, TX 78229, USA
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Abstract
Src-family Kinases (SFKs) participate in the regulation of proliferation, differentiation, apoptosis, autophagy, adhesion, migration, invasion and angiogenesis in normal and cancer cells. Abnormal expression of SFKs has been documented in cancers that arise in breast, colon, ovary, melanocyte, gastric mucosa, head and neck, pancreas, lung, and brain. Targeting SFKs in cancer cells has been shown to be a promising therapeutic strategy in solid tumors, particularly in ovarian, colon and breast cancers. Paclitaxel is one of most widely used chemotherapeutic agents for the management of ovarian, breast, lung and head/neck cancers. As a microtubule-stabilizing agent, paclitaxel possesses both mitosis-dependent and mitosis-independent activities against cancer cells. A variety of mechanisms such as deregulation of P-glycoprotein, alteration of tubulin isotypes, alteration of microtubule-regulatory proteins, deregulation of apoptotic signaling pathways, mutation of tubulins and overexpression of copper transporters have been implicated in the development of primary or secondary resistance to paclitaxel. By affecting cancer cell survival, proliferation, autophagy, microtubule stability, motility, and/or angiogenesis, SFKs interact with mechanisms that regulate paclitaxel sensitivity. Inhibition of SFKs can potentiate the anti-tumor activity of paclitaxel by enhancing apoptosis, autophagy and microtubule stability. Based on pre-clinical observations, administration of SFK inhibitors in combination with paclitaxel could improve treatment for ovarian, breast, lung and head/neck cancers. Identification and validation of predictive biomarkers could also permit personalization of the therapy.
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Affiliation(s)
- Xiao-Feng Le
- Department of Experimental Therapeutics, University of Texas MD Anderson Cancer Center, Houston, USA.
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Boonyaratanakornkit V. Scaffolding proteins mediating membrane-initiated extra-nuclear actions of estrogen receptor. Steroids 2011; 76:877-84. [PMID: 21354435 DOI: 10.1016/j.steroids.2011.02.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 01/14/2011] [Accepted: 02/16/2011] [Indexed: 12/30/2022]
Abstract
Estrogen mediates biological effects on cell proliferation, differentiation, and homeostasis through estrogen receptor (ER). In addition to functioning as a ligand-activated nuclear transcription factor to directly regulate gene transcription, ER also mediates rapid activation of signaling pathways independent of its transcriptional activity. A subpopulation of ER localized to the cell membrane or cytoplasm has been proposed to mediate ER activation of signaling pathways. This review focuses on recent advances in our understanding of mechanisms responsible for ER cytoplasm/membrane localization, where rapid extra-nuclear signaling is initiated. These mechanisms include lipid modification of the receptor (palmitoylation) and interactions with membrane and cytoplasmic adaptor proteins including caveolins, striatin, p130Cas, Shc, HPIP, MTA-1s, and MNAR/PELP1. While it is clear that ER mediates rapid extra-nuclear signaling resulting in activation of signaling pathways such as Src/MAPK and PI-3 kinase/Akt, how ER extra-nuclear signaling influences overall ER/estrogen physiology is still not well understood. Future studies defining physiological roles of ER extra-nuclear actions and crosstalk with its nuclear counterparts will be important to our overall understanding of estrogen and ER biological functions.
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Affiliation(s)
- Viroj Boonyaratanakornkit
- Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, MS-130, Houston, TX 77030, USA.
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Chakravarty D, Roy SS, Babu CR, Dandamudi R, Curiel TJ, Vivas-Mejia P, Lopez-Berestein G, Sood AK, Vadlamudi RK. Therapeutic targeting of PELP1 prevents ovarian cancer growth and metastasis. Clin Cancer Res 2011; 17:2250-9. [PMID: 21421858 DOI: 10.1158/1078-0432.ccr-10-2718] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
PURPOSE Ovarian cancer remains a major threat to women's health, partly due to difficulty in early diagnosis and development of metastases. A critical need exists to identify novel targets that curb the progression and metastasis of ovarian cancer. In this study, we examined whether the nuclear receptor coregulator PELP1 (proline-, glutamic acid-, leucine-rich protein-1) contributes to progression and metastatic potential of ovarian cancer cells and determined whether blocking of the PELP1 signaling axis had a therapeutic effect. EXPERIMENTAL DESIGN Ovarian cancer cells stably expressing PELP1-shRNA (short hairpin RNA) were established. Fluorescent microscopy, Boyden chamber, invasion assays, wound healing, and zymography assays were performed to examine the role of PELP1 in metastasis. Expression analysis of the model cells was conducted using tumor metastasis microarray to identify PELP1 Target genes. Therapeutic potential of PELP1-siRNA in vivo was determined using a nanoliposomal formulation of PELP1-siRNA-DOPC (1,2-dioleoyl-sn-glycero-3-phosphatidylcholine) administered systemically in a xenograft model. RESULTS PELP1 knockdown caused cytoskeletal defects and significantly affected the migratory potential of ovarian cancer cells. Microarray analysis revealed that PELP1 affected the expression of selective genes involved in metastasis including Myc, MTA1, MMP2, and MMP9. Zymography analysis confirmed that PELP1 knockdown caused a decrease in the activation of matrix metalloproteases (MMP) 2 and MMP9. Compared with control siRNA-DOPC-treated mice, animals injected with PELP1-siRNA-DOPC had 54% fewer metastatic tumor nodules, exhibited a 51% reduction in tumor growth and an 84% reduction in ascites volume. CONCLUSION The results suggest that PELP1 signaling axis is a potential druggable target and liposomal PELP1-siRNA-DOPC could be used as a novel drug to prevent or treat ovarian metastasis.
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Affiliation(s)
- Dimple Chakravarty
- Department of Obstetrics and Gynecology, CTRC, The UT Health Science Center, San Antonio, Texas 78229, USA
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The SUMO system controls nucleolar partitioning of a novel mammalian ribosome biogenesis complex. EMBO J 2011; 30:1067-78. [PMID: 21326211 DOI: 10.1038/emboj.2011.33] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Accepted: 01/21/2011] [Indexed: 11/08/2022] Open
Abstract
Ribosome biogenesis is a tightly controlled pathway that requires an intricate spatial and temporal interplay of protein networks. Most structural rRNA components are generated in the nucleolus and assembled into pre-ribosomal particles, which are transferred for further maturation to the nucleoplasm and cytoplasm. In metazoa, few regulatory components for these processes have been characterized. Previous work revealed a critical role for the SUMO-specific protease SENP3 in the nucleolar steps of ribosome biogenesis. We biochemically purified a SENP3-associated complex comprising PELP1, TEX10 and WDR18, and demonstrate that this complex is involved in maturation and nucleolar release of the large ribosomal subunit. We identified PELP1 and the PELP1-associated factor LAS1L as SENP3-sensitive targets of SUMO, and provide evidence that balanced SUMO conjugation/deconjugation determines the nucleolar partitioning of this complex. This defines the PELP1-TEX10-WDR18 complex as a regulator of ribosome biogenesis and suggests that its SUMO-controlled distribution coordinates the rate of ribosome formation. These findings contribute to the basic understanding of mammalian ribosome biogenesis and shed new light on the role of SUMO in this process.
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Significance of ER-Src axis in hormonal therapy resistance. Breast Cancer Res Treat 2010; 130:377-85. [PMID: 21184269 DOI: 10.1007/s10549-010-1312-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Accepted: 12/13/2010] [Indexed: 10/18/2022]
Abstract
The estrogen receptor (ER) is implicated in the progression of breast cancer. Despite positive effects of hormonal therapy, initial or acquired resistance to endocrine therapies frequently occurs. Recent studies suggested ERα-coregulator PELP1 and growth factor receptor ErbB2/HER2 play an essential role in hormonal therapy responsiveness. Src axis couples ERα with HER2 and PELP1, thus representing a new pathway for targeted therapy resistance. To establish the significance of ER-Src axis in PELP1 and HER2 mediated therapy resistance, we have generated model cells that stably express Src-shRNA under conditions of PELP1, HER2 deregulation. Depletion of Src using shRNA substantially reduced E2 mediated activation of Src and MAPK activation in resistant model cells. Pharmacological inhibition of Src using dasatinib, an orally available inhibitor substantially inhibited the growth of therapy resistant MCF7-PELP1, MCF7-HER2, and MCF7-Tam model cells in proliferation assays. In post-menopausal xenograft based studies, treatment with dasatinib significantly inhibited the growth of therapy resistant cells. IHC analysis revealed that the tumors were ERα positive, and dasatinib treated tumors exhibited alterations in Src and MAPK signaling pathways. Combinatorial therapy of tamoxifen with dasatinib showed better therapeutic effect compared to single agent therapy on the growth of therapy resistant PELP1 driven tumors. The results from our study showed that ER-Src axis play an important role in promoting hormonal resistance by proto-oncogenes such as HER2, PELP1, and blocking this axis prevents the development of hormonal independence in vivo. Since PELP1, HER2, and Src kinase are commonly deregulated in breast cancers, combination therapies using both endocrine agents and dasatinib may have better therapeutic effect by delaying the development of hormonal resistance.
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Chakravarty D, Tekmal RR, Vadlamudi RK. PELP1: A novel therapeutic target for hormonal cancers. IUBMB Life 2010; 62:162-9. [PMID: 20014005 DOI: 10.1002/iub.287] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recent studies implicate that the estrogen receptor (ER) coregulator proline-, glutamic acid-, and leucine-rich protein (PELP) 1 as playing critical roles in ER-genomic, ER-nongenomic, and ER-signaling cross talk with growth factor signaling pathways. PELP1 expression is deregulated in hormonal cancers and recent studies further elucidated the molecular mechanisms by which PELP1 regulates hormone therapy response. Although PELP1 is important for normal functions of the ER, the possibility to target ER-PELP1 axis appears to be an effective strategy for preventing hormonal carcinogenesis and therapy resistance. Thus, PELP1 may be useful as prognostic marker for hormonal cancers and PELP1 signaling may be useful to generate targeted therapeutics to overcome hormonal therapy resistance.
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Affiliation(s)
- Dimple Chakravarty
- Department of Obstetrics and Gynecology, The University of Texas Health Science Center at San Antonio, 78229, USA
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Chakravarty D, Nair SS, Santhamma B, Nair BC, Wang L, Bandyopadhyay A, Agyin JK, Brann D, Sun LZ, Yeh IT, Lee FY, Tekmal RR, Kumar R, Vadlamudi RK. Extranuclear functions of ER impact invasive migration and metastasis by breast cancer cells. Cancer Res 2010; 70:4092-101. [PMID: 20460518 DOI: 10.1158/0008-5472.can-09-3834] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The molecular basis of breast cancer progression to metastasis and the role of estrogen receptor (ER) signaling in this process remain poorly understood. Emerging evidence suggests that ER participates in extranuclear signaling in addition to genomic functions. Recent studies identified proline-, glutamic acid-, and leucine-rich protein-1 (PELP1) as one of the components of ER signalosome in the cytoplasm. PELP1 expression is deregulated in metastatic breast tumors. We examined the mechanism and significance of ER-PELP1-mediated extranuclear signals in the cytoskeletal remodeling and metastasis. Using estrogen dendrimer conjugate (EDC) that uniquely activate ER extranuclear signaling and by using model cells that stably express PELP1 short hairpin RNA (shRNA), we show that PELP1 is required for optimal activation of ER extranuclear actions. Using a yeast two-hybrid screen, we identified integrin-linked kinase 1 (ILK1) as a novel PELP1-binding protein. Activation of extranuclear signaling by EDC uniquely enhanced E2-mediated ruffles and filopodia-like structures. Using dominant-negative and dominant-active reagents, we found that estrogen-mediated extranuclear signaling promotes cytoskeleton reorganization through the ER-Src-PELP1-phosphoinositide 3-kinase-ILK1 pathway. Using in vitro Boyden chamber assays and in vivo xenograft assays, we found that ER extranuclear actions contribute to cell migration. Collectively, our results suggest that ER extranuclear actions play a role in cell motility/metastasis, establishing for the first time that endogenous PELP1 serves as a critical component of ER extranuclear actions leading to cell motility/invasion and that the ER-Src-PELP1-ILK1 pathway represents a novel therapeutic target for preventing the emergence of ER-positive metastasis.
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Affiliation(s)
- Dimple Chakravarty
- Department of Obstetrics and Gynecology and CTRC at The UT Health Science Center, San Antonio, Texas 78229-3900, USA
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Vadlamudi RK, Rajhans R, Chakravarty D, Nair BC, Nair SS, Evans DB, Chen S, Tekmal RR. Regulation of aromatase induction by nuclear receptor coregulator PELP1. J Steroid Biochem Mol Biol 2010; 118:211-8. [PMID: 19800002 PMCID: PMC2826517 DOI: 10.1016/j.jsbmb.2009.09.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Revised: 09/18/2009] [Accepted: 09/18/2009] [Indexed: 11/16/2022]
Abstract
Estradiol (E2), estrogen receptor (ER), ER-coregulators have been implicated in the development and progression of breast cancer. In situ E2 synthesis is implicated in tumor cell proliferation through autocrine or paracrine mechanisms, especially in post-menopausal women. Several recent studies demonstrated activity of aromatase P450 (Cyp19), a key enzyme that plays critical role in E2 synthesis in breast tumors. The mechanism by which tumors enhance aromatase expression is not completely understood. Recent studies from our laboratory suggested that PELP1 (Proline, Glutamic acid, Leucine rich Protein 1), a novel ER-coregulator, functions as a potential proto-oncogene and promotes tumor growth in nude mice models without exogenous E2 supplementation. In this study, we found that PELP1 deregulation contributes to increased expression of aromatase, local E2 synthesis and PELP1 cooperates with growth factor signaling components in the activation of aromatase. PELP1 deregulation uniquely up-regulated aromatase expression via activation of aromatase promoter I.3/II. Analysis of PELP1 driven mammary tumors in xenograft as well as in transgenic mouse models revealed increased aromatase expression. PELP1-mediated induction of aromatase requires functional Src and PI3K pathways. Chromatin immuno precipitation (ChIP) assays revealed that PELP1 is recruited to the Aro 1.3/II aromatase promoter. HER2 signaling enhances PELP1 recruitment to the aromatase promoter and PELP1 plays a critical role in HER2-mediated induction of aromatase expression. Mechanistic studies revealed that PELP1 interactions with orphan receptor ERRalpha, and histone demethylases play a role in the activation of aromatase promoter. Accordingly, ChIP analysis showed alterations in histone modifications at the aromatase promoter in the model cells that exhibit local E2 synthesis. Immunohistochemical analysis of breast tumor progression tissue arrays suggested that deregulation of aromatase expression occurs in advanced-stage and node-positive tumors, and that cooverexpression of PELP1 and aromatase occur in a sub set of tumors. Collectively, our results suggest that PELP1 regulation of aromatase represent a novel mechanism for in situ estrogen synthesis leading to tumor proliferation by autocrine loop and open a new avenue for ablating local aromatase activity in breast tumors.
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Affiliation(s)
- Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, and CTRC, San Antonio, TX, USA.
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Fox EM, Andrade J, Shupnik MA. Novel actions of estrogen to promote proliferation: integration of cytoplasmic and nuclear pathways. Steroids 2009; 74:622-7. [PMID: 18996136 PMCID: PMC2702758 DOI: 10.1016/j.steroids.2008.10.014] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Accepted: 10/25/2008] [Indexed: 12/28/2022]
Abstract
Both steroids and growth factors stimulate proliferation of steroid-dependent tumor cells, and interaction between these signaling pathways occurs at several levels. Steroid receptors are classified as ligand-activated transcription factors, and steps by which they activate target gene transcription are well understood. Several steroid responses have now been functionally linked to other intracellular signaling pathways, including c-Src or tyrosine kinase receptors. Steroids such as 17beta-estradiol (E2), via binding to cytoplasmic or membrane-associated receptors, were also shown to rapidly activate intracellular signaling cascades such as ERK, PI3K and STATs. These E2-stimulated phosphorylations can then contribute to altered tumor cell function. ER-positive breast cancer cells, in which proliferation is stimulated by E2 and suppressed by antiestrogens, have been of particular interest in dissecting nuclear and cytoplasmic roles of estrogen receptors (ER). In some cell contexts, ER interacts directly with the intracellular tyrosine kinase c-Src and other cytoplasmic signaling and adaptor molecules, such as Shc, PI3K, MNAR, and p130 Cas. Although the hierarchy among these associations is not known, it is clear that c-Src plays a fundamental role in both growth factor and E2-stimulated cell growth, and this may also require other growth factor receptors such as those for EGF or IGF-1. STAT transcription factors represent one pathway to integrate E2 cytoplasmic and nuclear signaling. STAT5 is phosphorylated in the cytoplasm at an activating tyrosine in response to E2 or EGF, and then is translocated to the nucleus to stimulate target gene transcription. E2 stimulates recruitment of STAT5 and ER to the promoter of several proliferative genes, and STAT5 knockdown prevents recruitment of either protein to these promoters. STAT5 activation by E2 in breast cancer cells requires c-Src and EGF receptor, and inhibition of c-Src or EGFR, or knockdown of STAT5, prevents E2 stimulation of several genes and breast cancer cell proliferation. Hyperactivation of the growth factor receptor-c-Src pathway can in some contexts decrease growth responses to E2, or render cells and tumors resistant to suppressive actions of endocrine therapies. Crosstalk between growth factors and steroids in both the cytoplasm and nucleus may thus have a profound impact on complex biological processes such as cell growth, and may play a significant role in the treatment of steroid-dependent breast cancers.
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Affiliation(s)
- Emily M. Fox
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22903
| | - Josefa Andrade
- Department of, Medicine, University of Virginia School of Medicine, Charlottesville, VA 22903
| | - Margaret A. Shupnik
- Department of, Medicine, University of Virginia School of Medicine, Charlottesville, VA 22903
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Kumar R, Zhang H, Holm C, Vadlamudi RK, Landberg G, Rayala SK. Extranuclear coactivator signaling confers insensitivity to tamoxifen. Clin Cancer Res 2009; 15:4123-30. [PMID: 19470742 DOI: 10.1158/1078-0432.ccr-08-2347] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Tamoxifen is one of many standard therapeutic options currently available for estrogen receptor-alpha-positive breast cancer patients. Emerging data have suggested that levels of estrogen receptor coregulatory proteins play a significant role in acquiring resistance to antiestrogen action. It has been suggested that high levels of estrogen receptor coactivators and its mislocalization may enhance the estrogen agonist activity of tamoxifen and contribute to tamoxifen resistance. EXPERIMENTAL DESIGN In an effort to understand the impact of nongenomic signaling and its contribution to hormone resistance in a whole-animal setting, we generated a transgenic mouse expressing a cytoplasmic version of proline-, glutamic acid-, and leucine-rich protein-1 (PELP1) mutant defective in its nuclear translocation (PELP1-cyto) and implanted these mice with tamoxifen pellets to assess its responsiveness. RESULTS We show that mammary glands from these mice developed widespread hyperplasia with increased cell proliferation and enhanced activation of mitogen-activated protein kinase and AKT as early as 12 weeks of age. Treatment with tamoxifen did not inhibit this hyperplasia; instead, such treatment exaggerated hyperplasia with an enhanced degree of alteration, indicative of hypersensitivity to tamoxifen. Analysis of molecular markers in the transgenic mammary glands from the tamoxifen-treated transgenic mice showed higher levels of proliferation markers proliferating cell nuclear antigen and activated mitogen-activated protein kinase than in untreated PELP1-cyto cell-derived mice. We also found that nude mice with MCF-7/PELP1-cyto cell-derived tumor xenografts did not respond to tamoxifen. Using immunohistochemical analysis, we found that 43% of human breast tumor samples had high levels of cytoplasmic PELP1, which shows a positive correlation between tumor grade and proliferation. Patients whose tumors had high levels of cytoplasmic PELP1 exhibited a tendency to respond poorly to tamoxifen compared with patients whose tumors had low levels of cytoplasmic PELP1. CONCLUSIONS These findings suggest that PELP1 localization could be used as a determinant of hormone sensitivity or vulnerability. The establishment of the PELP1-cyto transgenic mouse model is expected to facilitate the development of preclinical approaches for effective intervention of breast tumors using cytoplasmic coregulators and active nongenomic signaling.
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Affiliation(s)
- Rakesh Kumar
- Department of Biochemistry and Molecular Biology, Institute of Coregulator Biology, The George Washington University Medical Center, Washington, District of Columbia 20037, USA
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