title: TRPV2 channel negatively controls glioma cell proliferation and resistance to Fas-induced apoptosis in ERK-dependent manner.
abstract: The aim of this study was to investigate the expression and function of the transient receptor potential vanilloid 2 (TRPV2) in human glioma cells. By Real-Time-PCR and western blot analysis, we found that TRPV2 messenger RNA (mRNA) and protein were expressed in benign astrocyte tissues, and its expression progressively declined in high-grade glioma tissues as histological grade increased (n = 49 cases), and in U87MG cells and in MZC, FCL and FSL primary glioma cells. To investigate the function of TRPV2 in glioma, small RNA interfering was used to silence TRPV2 expression in U87MG cells. As evaluated by RT-Profiler PCR array, siTRPV2-U87MG transfected cells displayed a marked downregulation of Fas and procaspase-8 mRNA expression, associated with upregulation of cyclin E1, cyclin-dependent kinase 2, E2F1 transcriptor factor 1, V-raf-1 murine leukemia viral oncogene homolog 1 and Bcl-2-associated X protein (Bcl-X(L)) mRNA expression. TRPV2 silencing increased U87MG cell proliferation as shown by the increased percentage of cells incorporating 5-bromo-2-deoxyuridine expressing beta(III)-tubulin and rescued glioma cells to Fas-induced apoptosis. These events were dependent on extracellular signal-regulated kinase (ERK) activation: indeed inhibition of ERK activation in siTRPV2-U87MG transfected cells by treatment with PD98059, a specific mitogen-activated protein kinase/extracellular signal-regulated kinase kinase inhibitor, reduced Bcl-X(L) protein levels, promoted Fas expression, and restored Akt/protein kinase B pathway activation leading to reduced U87MG cell survival and proliferation, and increased sensitivity to Fas-induced apoptosis. In addition, transfection of TRPV2 in MZC glioma cells, by inducing Fas overexpression, resulted in a reduced viability and an increased spontaneous and Fas-induced apoptosis. Overall, our findings indicate that TRPV2 negatively controls glioma cell survival and proliferation, as well as resistance to Fas-induced apoptotic cell death in an ERK-dependent manner.
authors.affiliation: Department of Experimental Medicine and Public Health, University of Camerino, 62032 Camerino (Macerata), Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Nabissi
authors.forename: Maria Beatrice
authors.initials: MB
authors.lastname: Morelli
authors.forename: Consuelo
authors.initials: C
authors.lastname: Amantini
authors.forename: Valerio
authors.initials: V
authors.lastname: Farfariello
authors.forename: Lucia
authors.initials: L
authors.lastname: Ricci-Vitiani
authors.forename: Sara
authors.initials: S
authors.lastname: Caprodossi
authors.forename: Antonella
authors.initials: A
authors.lastname: Arcella
authors.forename: Matteo
authors.initials: M
authors.lastname: Santoni
authors.forename: Felice
authors.initials: F
authors.lastname: Giangaspero
authors.forename: Ruggero
authors.initials: R
authors.lastname: De Maria
authors.forename: Giorgio
authors.initials: G
authors.lastname: Santoni
mesh_terms: D017209:Apoptosis; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D048049:Extracellular Signal-Regulated MAP Kinases / Q000502:physiology*; D005419:Flavonoids / Q000494:pharmacology; D005910:Glioma / Q000188:drug therapy / Q000473:pathology*; D006801:Humans; D010766:Phosphorylation; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis; D050916:TRPV Cation Channels / Q000032:analysis / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D051020:bcl-X Protein / Q000032:analysis; D019014:fas Receptor / Q000502:physiology*
chemical_list: C494811:BCL2L1 protein, human; D005419:Flavonoids; D012333:RNA, Messenger; D050916:TRPV Cation Channels; C400769:TRPV2 protein, human; D051020:bcl-X Protein; D019014:fas Receptor; D051057:Proto-Oncogene Proteins c-akt; D048049:Extracellular Signal-Regulated MAP Kinases; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one