Transient Receptor Potential Mucolipin-1 Channels in Glioblastoma: Role in Patient's Survival.
Maria Beatrice MorelliConsuelo AmantiniDaniele TomassoniMassimo NabissiAntonella ArcellaGiorgio SantoniPublished in: Cancers (2019)
A link between mucolipin channels and tumors has been recently suggested. Herein, we aim to investigate the transient receptor potential mucolipin (TRPML)-1 relevance in glioblastoma. The expression of this channel was evaluated via qRT-PCR and immunohistochemistry in biopsies from 66 glioblastoma patients and two human glioblastoma cell lines and compared to normal human brain, astrocytes, and epileptic tissues. The subcellular distribution of TRPML-1 was examined via confocal microscopy in the glioma cell lines. Then, to assess the role of TRPML-1, cell viability assays have been conducted in T98 and U251 cell lines treated with the specific TRPML-1 agonist, MK6-83. We found that MK6-83 reduced cell viability and induced caspase-3-dependent apoptosis. Indeed, the TRPML-1 silencing or the blockage of TRPML-1 dependent [Ca2+]i release abrogated these effects. In addition, exposure of glioma cells to the reactive oxygen species (ROS) inducer, carbonyl cyanide m-chlorophenylhydrazone (CCCP), stimulated a TRPML-1-dependent autophagic cell death, as demonstrated by the ability of the autophagic inhibitor bafilomycin A, the TRPML-1 inhibitor sphingomyelin, and the TRPML-1 silencing to completely inhibit the CCCP-mediated effects. To test a possible correlation with patient's survival, Kaplan-Meier, univariate, and multivariate analysis have been performed. Data showed that the loss/reduction of TRPML-1 mRNA expression strongly correlates with short survival in glioblastoma (GBM) patients, suggesting that the reduction of TRPML-1 expression represents a negative prognostic factor in GBM patients.
Keyphrases
- cell death
- prognostic factors
- end stage renal disease
- newly diagnosed
- reactive oxygen species
- gene expression
- oxidative stress
- endothelial cells
- peritoneal dialysis
- binding protein
- case report
- cell proliferation
- signaling pathway
- patient reported outcomes
- risk assessment
- subarachnoid hemorrhage
- high glucose
- induced apoptosis
- ultrasound guided
- data analysis
- induced pluripotent stem cells