Ganci F.,Regina Elena Cancer Institute |
Vico C.,University of Rome La Sapienza |
Korita E.,Regina Elena Cancer Institute |
Sacconi A.,Regina Elena Cancer Institute |
And 12 more authors.
Lung Cancer | Year: 2014
Background: Thymic epithelial tumors (TET) are the most frequent human primary mediastinal tumors in adults. A deep biological characterization of the processes at the basis of the transformed phenotype could strongly improve our understanding of the morphological and clinical heterogeneity of these diseases. MicroRNAs (miRNAs) are non-coding RNAs involved in post-transcriptional regulation and their altered expression accounts for the pathogenesis of several tumors. Objectives: The aim of this study was to identify the miRNAs that are differentially expressed in tumor vs normal thymic tissues or among the different tumor histotypes and that could impact on the biology of TET. Materials and methods: microRNAs expression profiling was performed by microarray analysis of formalin-fixed paraffin embedded (FFPE) tissue from 54 thymic tumor samples and 12 normal counterparts, derived from two patient cohorts. Results and conclusion: We identified groups of miRNAs differentially expressed between: (i) TET and normal thymic tissues, (ii) thymomas and thymic carcinomas, (iii) histotype groups. Moreover, we identified putative molecular pathways targeted by these differentially expressed miRNAs that could be involved in thymic carcinogenesis and in the maintenance and spreading of this tumor. © 2014 Elsevier Ireland Ltd.
Conteduca V.,Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori |
Caffo O.,Santa Chiara Hospital |
Fratino L.,National Cancer Center |
Lo Re G.,Santa Maria Degli Angeli General Hospital |
And 17 more authors.
Future Oncology | Year: 2015
Background: The objective of this study was to analyze the impact of visceral metastases in castration-resistant prostate cancer (CRPC) treated with abiraterone. Materials & methods: All CRPC patients received abiraterone 1000 mg daily plus prednisone 10 mg orally daily. Liver and lung metastases were considered as visceral metastases. Results: Of 265 CRPC patients, 49 had visceral metastases. Results on progression-free survival were not significantly different in patients with or without visceral metastases. Conversely, the median overall survival between the two groups was 12.4 and 18.5 months (p = 0.01), respectively, and median overall survival of patients with liver-only disease versus other sites was 10.5 versus 18.5 months (p = 0.006), respectively. Conclusion: Visceral disease appears to be an important predictor of clinical outcome in CRPC patients treated with abiraterone. © 2015 Future Medicine Ltd.
Santoro R.,Regina Elena Cancer Institute |
Mori F.,Regina Elena Cancer Institute |
Marani M.,Regina Elena Cancer Institute |
Grasso G.,S. Vincenzo Hospital |
And 4 more authors.
Carcinogenesis | Year: 2013
Melatonin has been known to be a chemopreventive agent since its levels inversely correlate with the risk of developing cancer. We have recently shown that melatonin induces p38-dependent phosphorylation of both p53 and histone H2AX. This is associated with a p53-mediated increase in repair of both endogenous and chemotherapy-induced DNA damage. In addition, the inhibition of p38 activities impairs melatonin's capability to induce a p53-dependent DNA damage response and thus its ability to maintain genome integrity. Since melatonin-induced p53 phosphorylation requires an intact p38 phosphorylation cascade and p38 can be activated by G proteins, we supposed that melatonin's activities could be mediated by its G-protein-coupled membrane receptors, MT1 and MT2. Here, we show that the activation of the p53-dependent DNA damage response by melatonin is indeed mediated by MT1 and MT2. As a result, the absence of either receptor impairs melatonin's ability to reduce both cell proliferation and clonogenic potential of cancer cells. In addition, this causes an impairment of the p53-dependent DNA damage response. By providing molecular insight, our findings might have translational impact, suggesting the involvement of melatonin receptors in tumorigenesis. © The Author 2013. Published by Oxford University Press. All rights reserved.
Sacconi A.,Italian National Cancer Institute |
Biagioni F.,Italian National Cancer Institute |
Canu V.,Italian National Cancer Institute |
Mori F.,Regina Elena Cancer Institute |
And 17 more authors.
Cell Death and Disease | Year: 2012
Micro RNAs (miRs) are small non-coding RNAs aberrantly expressed in human tumors. Here, we aim to identify miRs whose deregulated expression leads to the activation of oncogenic pathways in human gastric cancers (GCs). Thirty nine out of 123 tumoral and matched uninvolved peritumoral gastric specimens from three independent European subsets of patients were analyzed for the expression of 851 human miRs using Agilent Platform. The remaining 84 samples were used to validate miRs differentially expressed between tumoral and matched peritumoral specimens by qPCR. miR-204 falls into a group of eight miRs differentially expressed between tumoral and peritumoral samples. Downregulation of miR-204 has prognostic value and correlates with increased staining of Bcl-2 protein in tumoral specimens. Ectopic expression of miR-204 inhibited colony forming ability, migration and tumor engraftment of GC cells. miR-204 targeted Bcl-2 messenger RNA and increased responsiveness of GC cells to 5-fluorouracil and oxaliplatin treatment. Ectopic expression of Bcl-2 protein counteracted miR-204 pro-apoptotic activity in response to 5-fluorouracil. Altogether, these findings suggest that modulation of aberrant expression of miR-204, which in turn releases oncogenic Bcl-2 protein activity might hold promise for preventive and therapeutic strategies of GC. © 2012 Macmillan Publishers Limited.
Biagioni F.,Regina Elena Cancer Institute |
Bossel Ben-Moshe N.,Weizmann Institute of Science |
Fontemaggi G.,Regina Elena Cancer Institute |
Canu V.,Regina Elena Cancer Institute |
And 15 more authors.
EMBO Molecular Medicine | Year: 2012
Deregulated proliferation is a hallmark of cancer cells. Here, we show that microRNA-10b* is a master regulator of breast cancer cell proliferation and is downregulated in tumoural samples versus matched peritumoural counterparts. Two canonical CpG islands (5kb) upstream from the precursor sequence are hypermethylated in the analysed breast cancer tissues. Ectopic delivery of synthetic microRNA-10b* in breast cancer cell lines or into xenograft mouse breast tumours inhibits cell proliferation and impairs tumour growth in vivo, respectively. We identified and validated in vitro and in vivo three novel target mRNAs of miR-10b* (BUB1, PLK1 and CCNA2), which play a remarkable role in cell cycle regulation and whose high expression in breast cancer patients is associated with reduced disease-free survival, relapse-free survival and metastasis-free survival when compared to patients with low expression. This also suggests that restoration of microRNA-10b* expression might have therapeutic promise. © 2012 The Authors.