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Contrast Ultrasound Targeted Treatment of Gliomas in Mice via Drug-Bearing Nanoparticle Delivery and Microvascular Ablation
Published on: December 15, 2010
Diamond Nanoparticles Downregulate Expression of CycD and CycE in Glioma Cells
Marta Grodzik1, Jaroslaw Szczepaniak2, Barbara Strojny-Cieslak3
1Division of Nanobiotechnology, Faculty of Animal Sciences, Warsaw University of Life Sciences, Ciszewskiego 8, 02-786 Warsaw, Poland. marta_grodzik@sggw.pl.
Abstract:
Our previous studies have shown that diamond nanoparticles (NDs) exhibited antiangiogenic and proapoptotic properties in vitro in glioblastoma multiforme (GBM) cells and in tumors in vivo. Moreover, NDs inhibited adhesion, leading to the suppression of migration and invasion of GBM. In the present study, we hypothesized that the NDs might also inhibit proliferation and cell cycle in glioma cells. Experiments were performed in vitro with the U87 and U118 lines of GBM cells, and for comparison, the Hs5 line of stromal cells (normal cells) after 24 h and 72 h of treatment. The analyses included cell morphology, cell death, viability, and cell cycle analysis, double timing assay, and gene expression (Rb, E2F1, CycA, CycB, CycD, CycE, PTEN, Ki-67). After 72 h of ND treatment, the expression level of Rb, CycD, and CycE in the U118 cells, and E2F1, CycD, and CycE in the U87 cells were significantly lower in comparison to those in the control group. We observed that decreased expression of cyclins inhibited the G1/S phase transition, arresting the cell cycle in the G0/G1 phase in glioma cells. The NDs did not affect the cell cycle as well as PTEN and Ki-67 expression in normal cells (Hs5), although it can be assumed that the NDs reduced proliferation and altered the cell cycle in fast dividing cells.
Insights
Diamond nanoparticles (NDs) were investigated for their effects on glioma cells. NDs were found to inhibit proliferation and arrest the cell cycle in glioma cells, offering potential therapeutic strategies.
Area of Science:
- Nanomedicine
- Oncology
- Cell Biology
Background:
- Previous research demonstrated diamond nanoparticles (NDs) possess antiangiogenic and proapoptotic properties against glioblastoma multiforme (GBM).
- NDs were also shown to inhibit GBM cell adhesion, migration, and invasion.
Purpose of the Study:
- To investigate the potential of NDs to inhibit proliferation and cell cycle progression in glioma cells.
- To evaluate the effects of NDs on gene expression related to cell cycle regulation.
Main Methods:
- In vitro experiments using U87 and U118 GBM cell lines and Hs5 normal stromal cells.
- Analyses included cell morphology, death, viability, cell cycle, proliferation assays, and gene expression profiling (Rb, E2F1, CycA, CycB, CycD, CycE, PTEN, Ki-67).
Main Results:
- ND treatment significantly reduced the expression of Rb, CycD, and CycE in U118 cells, and E2F1, CycD, and CycE in U87 cells after 72 hours.
- Decreased cyclin expression led to G1/S phase transition inhibition and G0/G1 cell cycle arrest in glioma cells.
- NDs did not impact the cell cycle or PTEN and Ki-67 expression in normal Hs5 cells.
Conclusions:
- Diamond nanoparticles effectively inhibit glioma cell proliferation by arresting the cell cycle at the G0/G1 phase.
- NDs demonstrate selective toxicity towards glioma cells, sparing normal stromal cells.
- These findings suggest NDs hold promise as a therapeutic agent for glioblastoma treatment.
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