Supplementary MaterialsAdditional document 1 : Supplementary Figure S1 p53, HNF-1, and ARID1A expression in OCCCa cells. shared. Abstract Background We previously demonstrated that ovarian high grade serous carcinomas (OHGSeCa) and ovarian clear cell carcinomas (OCCCa) with an HNF-1+/p53+/ARID1A+ immunophenotype were associated with the worst unfavorable prognosis. To clarify the molecular mechanisms underlying this finding, we focused on alterations in the p53 signaling pathway in these tumors. Methods Changes in cell phenotype and function following knockdown of wild-type p53 (p53-KD) were assessed using OCCCa cells expressing endogenous HNF-1 and ARID1A. The prognostic significance of molecules that were deregulated following p53-KD was also examined using 129 OCCCa/OHGSeCa cases. Results p53-KD cells had increased expression of Snail, phospho-Akt (pAkt), and pGSK3, and decreased E-cadherin expression, leading to epithelial-mesenchymal transition (EMT)/cancer stem cell (CSC) features. The cells also exhibited acceleration of cell motility and inhibition of cell proliferation and apoptosis. Next generation sequencing revealed that fibronectin (FN) expression was significantly increased in the p53 KD-cells, in line with our observation that wild-type p53 (but not mutant p53) repressed promoter activity. In addition, treatment of OCCCa cells with FN significantly increased cell migration capacity and Rabbit polyclonal to ELMOD2 decreased cell proliferation rate, independent of induction of EMT features. In clinical samples, FN/p53 scores were significantly higher in OCCCa/OHGSeCa with the HNF-1+/p53+/ARID1A+ immunophenotype when compared to others. Moreover, high FN/high p53 expression was associated with the worst overall survival and progression-free survival in OCCCa/OHGSeCa patients. Conclusion These findings suggest that upregulation of FN following loss of p53 function may impact the biological behavior of OCCCa/OHGSeCa, particularly in tumors with an HNF-1+/p53+/ARID1A+ immunophenotype, through alterations in cell mobility and cell proliferation. The accompanying induction of EMT/CSC properties and inhibition of apoptosis due to p53 abnormalities also contribute to the establishment and maintenance of tumor phenotypic characteristics. Video Abstract video file.(39M, mp4) gene are found in more than 50% of human malignancies and its inactivation can occur at various stages depending on the tissue that gives rise to the tumor. Therefore, loss of p53 function can promote neoplastic transformation as well as progression of established tumors to a more aggressive disease stage [6, 7]. In OECa, and particularly in ovarian high-grade serous carcinomas (OHGSeCa), mutant p53 (p53mt) missense LY2922470 mutations are frequently found in the hotspot codon R175, R248, and R273 (http://www-p53.iarc.fr/) that are critical contact residues in the p53 DNA-binding domain. The mutations occur early during tumorigenesis, most likely in precursor lesions of OECa, highlighting the importance of p53mt as a driver of the malignancy [8C11]. We previously developed an effective immunoprofiling classification system for OECa using only 4 immunohistochemical markers (HNF-1, p53, ARID1A, and WT1) [12]. Using this system, we demonstrated that tumors with an HNF-1+/p53+/ARID1A+ immunophenotype including OHGSeCa and ovarian clear cell carcinomas (OCCCa) were from the most unfavorable prognosis. LY2922470 LY2922470 In this scholarly study, we hypothesized that modifications in the p53 signaling pathway may play an integral role in identifying phenotypic features in OECa using the HNF-1+/p53+/ARID1A+ immunophenotype. To check this, LY2922470 we attempt to 1st examine the consequences of knocking down p53wt (p53-KD) in OCCCa cells expressing endogenous HNF-1 and ARID1A. Next, we used a next era sequencing (NGS) assay to identify the molecules associated with loss of p53 function. Finally, we examined associations between molecules that were differentially expressed following p53-KD, tumor phenotypic characteristics and prognostic significance in OHGSeCa and OCCCa. Methods Plasmids and cell lines The p53-specific short hairpin RNA (shRNA) oligonucleotides were designed as described previously [13]. Single-stranded p53 oligonucleotides were annealed and then cloned into promoter (UCSC genome browser, https://genome.ucsc.edu/) between ??2028 and???23 (where +?1 represents the transcription start site) was also generated by PCR and was cloned into the pGL3B vector (Promega, Madison, WT, USA). The primer sequences for the.