HMGA1 protein over-expression is a frequent feature of epithelial ovarian carcinomas

• Published in: Carcinogenesis (New York) 2003-07, Vol.24 (7), p.1191-1198
• Main Authors: Masciullo, Valeria, Baldassarre, Gustavo, Pentimalli, Francesca, Berlingieri, Maria Teresa, Boccia, Angelo, Chiappetta, Gennaro, Palazzo, Juan, Manfioletti, Guidalberto, Giancotti, Vincenzo, Viglietto, Giuseppe, Scambia, Giovanni, Fusco, Alfredo
• Format: Article
• Language: English
• Subjects: Adaptor Proteins, Signal Transducing; Adenocarcinoma - genetics; Adenoviridae - genetics; Biological and medical sciences; DNA Primers; DNA, Antisense - genetics; Female; Female genital diseases; GAPDH; Gene Expression Regulation, Neoplastic; glyceraldehyde-phosphate-dehydrogenase; GRB2 Adaptor Protein; Gynecology. Andrology. Obstetrics; high mobility group A1; HMGA1; HMGA1a Protein - genetics; HMGA1a Protein - metabolism; Humans; Immunoenzyme Techniques; LMP; low malignant potential; Medical sciences; Ovarian Neoplasms - genetics; Proteins - metabolism; Reverse Transcriptase Polymerase Chain Reaction; Tumor Cells, Cultured - pathology; Tumors
• ISSN: 0143-3334; 1460-2180
• DOI: 10.1093/carcin/bgg075

High mobility group A 1 (HMGA1) proteins are chromatinic factors, which are absent or expressed at very low levels in normal adult tissues, while they are over-expressed in several human malignant tumors. In this study, HMGA1 protein expression was investigated by immunohistochemistry in a series of 44 epithelial ovarian specimens, which included four normal ovarian tissues, 29 primary invasive carcinomas, one metastatic ovarian tumor and 10 low malignant potential (LMP) tumors. HMGA1 staining was not detected in normal ovarian surface epithelium, which is the area from which ovarian adenocarcinoma frequently arises. HMGA1 proteins were expressed at low levels in some LMP tumors, whereas they were present in abundance in most of the primary ovarian adenocarcinomas. RT–PCR and western blot analysis correlated with immunohistochemical data. We demonstrated that the suppression of HMGA1 protein synthesis by an adenovirus carrying the HMGA1 gene in antisense orientation (Ad-Yas-GFP) inhibited the growth of two human ovarian carcinoma cell lines (OVCAR-5 and OVCAR-8). These results confirm HMGA1 over-expression as a general feature of human malignant neoplasias, including ovarian cancer and suggest that suppression of HMGA1 protein synthesis by an antisense adenoviral vector may represent a new and promising gene therapy for the treatment of ovarian cancer.