Abstract
Purpose
Hematopoietic PBX interacting protein (HPIP), a scaffold protein, is known to regulate the proliferation, migration and invasion in different cancer cell types. The aim of this study was to assess the role of HPIP in ovarian cancer cell migration, invasion and epithelial-mesenchymal transition (EMT), and to unravel the mechanism by which it regulates these processes.
Methods
HPIP expression was assessed by immunohistochemistry of tissue microarrays containing primary ovarian tumor samples of different grades. OAW42, an ovarian carcinoma-derived cell line exhibiting a high HPIP expression, was used to study the role of HPIP in cell migration, invasion and EMT. HPIP knockdown in these cells was achieved using a small hairpin RNA (shRNA) approach. Cell migration and invasion were assessed using scratch wound and transwell invasion assays, respectively. The extent of EMT was assessed by determining the expression levels of Snail, Vimentin and E-cadherin using Western blotting. The effect of HPIP expression on AKT and MAPK activation was also investigated by Western blotting. Cell viabilities in response to cisplatin treatment were assessed using a MTT assay, whereas apoptosis was assessed by determining caspase-3 and PARP cleavage in ovarian carcinoma-derived SKOV3 cells.
Results
We found that HPIP is highly expressed in high-grade primary ovarian tumors. In addition, we found that HPIP promotes the migration, invasion and EMT in OAW42 cells and induces EMT in these cells via activation of the PI3K/AKT pathway. The latter was found to lead to stabilization of the Snail protein and to repression of E-cadherin expression through inactivation of GSK-3β. We also found that HPIP expression confers cisplatin resistance to SKOV3 cells after prolonged exposure and that its subsequent knockdown decreases the viability of these cells and increases caspase-3 activation and PARP proteolysis in these cells following cisplatin treatment.
Conclusions
From these results we conclude that HPIP expression is associated with high-grade ovarian tumors and may promote their migration, invasion and EMT, a process that is associated with metastasis. In addition, we conclude that HPIP may serve as a potential therapeutic target for cisplatin resistant ovarian tumors.
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Abbreviations
- HPIP/PBXIP1:
-
Hematopoietic PBX interacting protein/ pre B-cell leukemia homeobox interacting protein
- EMT:
-
Epithelial-mesenchymal transition
- GSK-3β:
-
Glycogen synthase kinase-3β
- PI3K:
-
Phosphatidylinositol 3-kinase
- MAPK:
-
Mitogen-activated protein kinase
- ERK½:
-
Extracellular signal-regulated kinase ½
- OCC:
-
Ovarian cystadenocarcinoma
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Acknowledgments
This work was supported by the Department of Biotechnology (DBT), India grants No- BT/MED/30/SP11273/2015; BT/PR8764/MED/97/104/2013, BT/PR7672/BRB/10/1173/2013, BT/01/IYBA/2009 (to BM), and the Department of Science and Technology (DST) grant No- SB/SO/BB/013/2013, India (to BM). We acknowledge DST-PURSE, UOH-DBT-CREBB, UGC-UPE2, UGC-DRS and DST-FIST for providing the research facilities at the University of Hyderabad. The authors thank Prof. Nagini Siddavaram, Annamalai University, India for critical reviewing and editing the manuscript.
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Vijay Kumar Gonugunta and Vasudevarao Penugurti contributed equally to this work
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Figure S1
Analysis of HPIP expression in ovarian cancer data obtained from Oncomine database. a. HPIP expression in Borderline Ovarian Serous Neoplasm (10) and Ovarian Serous Adenocarcinoma p < 0.0001(13) (Ref: Gilks et al., 2005; Gynecol Oncol; 2005/03/01) b. HPIP expression in Breast Carcinoma (44), Ovarian Adenocarcinoma (3), Ovarian Brenner Tumor (1), Ovarian Carcinosarcoma (2), Ovarian Clear Cell Adenocarcinoma (6), Ovarian Endometrioid Adenocarcinoma (6), Ovarian Mucinous Adenocarcinoma (7) and Ovarian Serous Adenocarcinoma (71); p < 0.001 (Meyniel et al., 2010; BMC Cancer; 2010/05/21 ). c. HPIP expression in Ovarian Adenocarcinoma (16), Ovarian Clear Cell Adenocarcinoma (3), Ovarian Endometrioid Adenocarcinoma (5),Mixed Ovarian Adenocarcinoma (2) and Ovarian Serous Adenocarcinoma (35); p < 0.0001 (J Natl Cancer Inst; 2002/07/03) d. HPIP expression in Ovarian Clear Cell Adenocarcinoma (8), Ovarian Endometrioid Adenocarcinoma (33), Malignant Ovarian Mixed Epithelial Tumor (9), Ovarian Mucinous Adenocarcinoma (10) and Ovarian Serous Adenocarcinoma (53); p < 0.0001 (Schwartz et al., 2001; Cancer Res; 2002/08/15). (PPTX 110 kb)
Figure S2
HPIP knockdown sensitizes PA-1 cells to cisplatin-induced cell death. a PA-1 cells were cisplatin (0.5 μg/ml) treated for 3 weeks and cisplatin-resistant cells were subjected to Western blotting as indicated. b PA-1 cells were transfected with either control shRNA or HPIP shRNA and treated with cisplatin at various concentrations for 24 h and cell viability was measured by MTT assay. IC50 values were calculated using Sigma plot. Inset, Western blot analysis demonstrating efficient knock down of HPIP in PA-1 cells. c PA-1 cells were transfected with either control shRNA or HPIP shRNA and treated with cisplatin for 24 h and cell lysates were subjected to Western blotting as indicated. (PPTX 1437 kb)
Table S1
Immunohistochemical scores of human ovarian tissue microarrays (hoTMAs). (XLSX 10 kb)
Table S2
Various grades of ovarian tumors used for HPIP expression (XLSX 16 kb)
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Bugide, S., Gonugunta, V.K., Penugurti, V. et al. HPIP promotes epithelial-mesenchymal transition and cisplatin resistance in ovarian cancer cells through PI3K/AKT pathway activation. Cell Oncol. 40, 133–144 (2017). https://doi.org/10.1007/s13402-016-0308-2
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DOI: https://doi.org/10.1007/s13402-016-0308-2