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Bioluminescence Imaging of an Immunocompetent Animal Model for Glioblastoma
Published on: January 15, 2016
Light-controlled inhibition of malignant glioma by opsin gene transfer
1Shenzhen Key Lab of Neuropsychiatric Modulation, Research Centre for Neural Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Xili Nanshan, Shenzhen, China.
Abstract:
Glioblastomas are aggressive cancers with low survival rates and poor prognosis because of their highly proliferative and invasive capacity. In the current study, we describe a new optogenetic strategy that selectively inhibits glioma cells through light-controlled membrane depolarization and cell death. Transfer of the engineered opsin ChETA (engineered Channelrhodopsin-2 variant) gene into primary human glioma cells or cell lines, but not normal astrocytes, unexpectedly decreased cell proliferation and increased mitochondria-dependent apoptosis, upon light stimulation. These optogenetic effects were mediated by membrane depolarization-induced reductions in cyclin expression and mitochondrial transmembrane potential. Importantly, the ChETA gene transfer and light illumination in mice significantly inhibited subcutaneous and intracranial glioma growth and increased the survival of the animals bearing the glioma. These results uncover an unexpected effect of opsin ion channels on glioma cells and offer the opportunity for the first time to treat glioma using a light-controllable optogenetic approach.
Insights
This study introduces an optogenetic method using ChETA to inhibit glioma cells via light-controlled cell death. This novel approach shows promise for treating aggressive brain tumors like glioblastoma.
Area of Science:
- Neuro-oncology
- Optogenetics
- Molecular Biology
Background:
- Glioblastomas are aggressive brain tumors with poor prognosis due to rapid proliferation and invasion.
- Current treatments for glioblastoma have limited efficacy, necessitating novel therapeutic strategies.
Purpose of the Study:
- To develop and evaluate a novel optogenetic strategy for selective inhibition of glioma cells.
- To investigate the effects of light-controlled membrane depolarization using the ChETA opsin on glioma cell behavior and survival.
Main Methods:
- Gene transfer of the engineered opsin ChETA into human glioma cells and normal astrocytes.
- Light stimulation to induce membrane depolarization and assess cellular responses.
- Evaluation of ChETA's effects on cell proliferation, apoptosis, cyclin expression, and mitochondrial function.
- In vivo studies in mice with subcutaneous and intracranial gliomas.
Main Results:
- Light-activated ChETA expression selectively inhibited glioma cell proliferation and induced apoptosis in glioma cells, but not astrocytes.
- Optogenetic treatment reduced cyclin expression and mitochondrial membrane potential in glioma cells.
- In vivo, ChETA gene transfer and light illumination significantly suppressed glioma growth and improved survival in mice.
Conclusions:
- Opsin ion channels can be leveraged for an optogenetic approach to treat glioblastoma.
- This light-controllable strategy offers a new therapeutic avenue for aggressive brain cancers.
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