Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Aberrant dna damage response pathways may predict the outcome of platinum chemotherapy in ovarian cancer
Δημιουργός/Συγγραφέας:	Stefanou D.T. Bamias A. Episkopou H. [EL] Κυρτόπουλος, Σωτήριος Α.[EN] Kyrtopoulos, Soterios A. Likka M. Kalampokas T. Photiou S. Gavalas N. Sfikakis P.P. Dimopoulos M.A. [EL] Σουλιώτης, Βασίλης Λ.[EN] Souliotis, Vassilis L.
Εκδότης:	Public Library of Science
Ημερομηνία:	2015
Γλώσσα:	Αγγλικά
ISSN:	1932-6203
DOI:	10.1371/journal.pone.0117654
Άλλο:	PubMed ID: 25659114
Περίληψη:	Ovarian carcinoma (OC) is the most lethal gynecological malignancy. Despite the advances in the treatment of OC with combinatorial regimens, including surgery and platinum-based chemotherapy, patients generally exhibit poor prognosis due to high chemotherapy resistance. Herein, we tested the hypothesis that DNA damage response (DDR) pathways are involved in resistance of OC patients to platinum chemotherapy. Selected DDR signals were evaluated in two human ovarian carcinoma cell lines, one sensitive (A2780) and one resistant (A2780/C30) to platinum treatment as well as in peripheral blood mononuclear cells (PBMCs) from OC patients, sensitive (n = 7) or resistant (n = 4) to subsequent chemotherapy. PBMCs from healthy volunteers (n = 9) were studied in parallel. DNA damage was evaluated by immunofluorescence ãH2AX staining and comet assay. Higher levels of intrinsic DNA damage were found in A2780 than in A2780/C30 cells. Moreover, the intrinsic DNA damage levels were significantly higher in OC patients relative to healthy volunteers, as well as in platinum-sensitive patients relative to platinum-resistant ones (all P <0.05). Following carboplatin treatment, A2780 cells showed lower DNA repair efficiency than A2780/ C30 cells. Also, following carboplatin treatment of PBMCs ex vivo , the DNA repair efficiency was significantly higher in healthy volunteers than in platinum-resistant patients and lowest in platinum-sensitive ones (t1/2 for loss of ãH2AX foci: 2.7± 0.5h, 8.8±1.9h and 15.4±3.2h, respectively; using comet assay, t1/2 of platinum-induced damage repair: 4.8±1.4h, 12.9±1.9h and 21.4±2.6h, respectively; all P<0.03). Additionally, the carboplatin-induced apoptosis rate was higher in A2780 than in A2780/C30 cells. In PBMCs, apoptosis rates were inversely correlated with DNA repair efficiencies of these cells, being significantly higher in plati-num-sensitive than in platinum-resistant patients and lowest in healthy volunteers (all P< 0.05). We conclude that perturbations of DNA repair pathways as measured in PBMCs from OC patients correlate with the drug sensitivity of these cells and reflect the individualized response to platinum-based chemotherapy.
Τίτλος πηγής δημοσίευσης:	PLoS ONE
Τόμος/Κεφάλαιο:	10
Τεύχος:	2
Θεματική Κατηγορία:	[EL] Βιολογία (Γενικά)[EN] Biology (General) [EL] Νεοπλάσματα. Όγκοι. Ογκολογία (περ. Καρκίνος, κακινογόνες ουσίες)[EN] Neoplasms. Tumors. Oncology (Incl.cancer, carcinogens)
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2015 Stefanou et al.
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Gold, Green
Εμφανίζεται στις συλλογές:	Ινστιτούτο Χημικής Βιολογίας - Επιστημονικό έργο