title: alpha5beta1 integrin antagonists reduce chemotherapy-induced premature senescence and facilitate apoptosis in human glioblastoma cells.
abstract: The alpha5beta1 integrin represent a new therapeutic target for glioblastoma, which are malignant brain tumors difficult to cure with conventional therapies. Glioblastoma are known to be highly resistant to chemotherapy. We, therefore, investigated whether blocking alpha5beta1 integrin with specific nonpeptidic antagonists concomitantly with chemotherapy (ellipticine and temozolomide) may impact the response to chemotherapy of human glioblastoma. Here we show that inhibiting alpha5beta1 integrin with 2 selective ligands (SJ749 and K34c) decreases chemotherapy-induced premature senescence and facilitates cell apoptosis in a functional p53 background (U87MG cells). When p53 is mutated and inactive (U373 cells), chemotherapy induces p53-independent cell apoptosis instead of senescence that is not improved by integrin antagonists. Silencing p53 in U87MG cells with siRNA as well as evaluating HCT116 p53+/+ and p53-/- colon carcinoma cell behavior support the hypothesis of an as yet unknown effect of alpha5beta1 integrin antagonists on the control of chemotherapy-induced premature senescence and apoptosis. alpha5beta1 integrin antagonists modulate the p53 signaling induced by chemotherapy. Our results highlight a new role of the alpha5beta1 integrin in the control of glioblastoma aggressiveness and responsiveness to chemotherapy, which may have a crucial impact in the clinical management of patients suffering from brain tumors.
authors.affiliation: Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 67401 Illkirch, France.
authors.forename: Eva
authors.initials: E
authors.lastname: Martinkova
authors.forename: Anne
authors.initials: A
authors.lastname: Maglott
authors.forename: David Y
authors.initials: DY
authors.lastname: Leger
authors.forename: Dominique
authors.initials: D
authors.lastname: Bonnet
authors.forename: Marie
authors.initials: M
authors.lastname: Stiborova
authors.forename: Ken
authors.initials: K
authors.lastname: Takeda
authors.forename: Sophie
authors.initials: S
authors.lastname: Martin
authors.forename: Monique
authors.initials: M
authors.lastname: Dontenwill
mesh_terms: D000375:Aging / Q000187:drug effects*; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D005909:Glioblastoma / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D039081:Integrin alpha5beta1 / Q000037:antagonists & inhibitors* / Q000378:metabolism; D011422:Propionates / Q000494:pharmacology*; D011725:Pyridines / Q000494:pharmacology*; D012333:RNA, Messenger / Q000235:genetics; D034741:RNA, Small Interfering / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013141:Spiro Compounds / Q000494:pharmacology*; D016159:Tumor Suppressor Protein p53 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*
chemical_list: D000970:Antineoplastic Agents; D039081:Integrin alpha5beta1; D011422:Propionates; D011725:Pyridines; D012333:RNA, Messenger; D034741:RNA, Small Interfering; C512312:SJ749; D013141:Spiro Compounds; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53