Abstract
The prognosis for patients with malignant gliomas is poor, but improvements may emerge from a better understanding of the pathophysiology of glioma signalling. Recent therapeutic developments have implicated lipid signalling in glioma cell death. Stress signalling in glioma cell death involves mitochondria and endoplasmic reticulum. Lipid mediators also signal via extrinsic pathways in glioma cell proliferation, migration and interaction with endothelial and microglial cells. Glioma cell death and tumour regression have been reported using polyunsaturated fatty acids in animal models, human ex vivo explants, glioma cell preparations and in clinical case reports involving intratumoral infusion. Cell death signalling was associated with generation of reactive oxygen intermediates and mitochondrial and other signalling pathways. In this review, evidence for mitochondrial responses to stress signals, including polyunsaturated fatty acids, peroxidising agents and calcium is presented. Additionally, evidence for interaction of glioma cells with primary brain endothelial cells is described, modulating human glioma peroxidative signalling. Glioma responses to potential therapeutic agents should be analysed in systems reflecting tumour connectivity and CNS structural and functional integrity. Future insights may also be derived from studies of signalling in glioma-derived tumour stem cells.
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Abbreviations
- AA:
-
arachidonic acid
- Akt:
-
serine–threonine protein kinase
- CHOP/GADD153:
-
CCAAT/enhancer binding protein homologous transcription factor
- CNS:
-
central nervous system
- COX:
-
cyclo-oxygenase
- ΔΨm:
-
transmembrane mitochondrial potential
- ER:
-
endoplasmic reticulum
- ERK:
-
extracellular signal-regulated kinase
- GLA:
-
gamma linolenic acid
- GF:
-
growth factors
- GFAP:
-
glial fibrillary acidic protein
- GRP78/BiP:
-
ER glucose-regulated protein 78
- H2O2 :
-
hydrogen peroxide
- iNOS:
-
inducible nitric oxide synthetase
- LO:
-
lipoxygenase
- MEK-1/2:
-
mitogen-activated protein kinase kinase 1/2
- MPT:
-
mitochondrial permeability transition pore
- PARP:
-
pol(ADP-ribosyl) polymerase
- PBR:
-
peripheral benzodiazepine receptor
- PDGF:
-
platelet-derived growth factor
- PDR:
-
peripheral benzodiazepine receptor
- Plase A2:
-
phospholipase A2
- PKAII:
-
type II protein kinase A
- PUFA:
-
polyunsaturated fatty acids
- roi:
-
reactive oxygen intermediates
- TLR:
-
Toll-like receptor-2
- TNF:
-
tumour necrosis factor
- TRAIL:
-
TNF-related apoptosis-inducing ligand
- roi:
-
reactive oxygen intermediates
- VEGFR:
-
vascular endothelial cell growth factor receptor
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Acknowledgements
We are very grateful to Amarin Neurosciences and to the Chest, Heart and Stroke Association Scotland for financial support, to Simon Brown (Inflammation Research, University of Edinburgh) for cell imaging facilities and to Ujval Anilkumar, Svitlana Loughridge, Viera Muzola, Sarah Bott and Claire Machin for laboratory project work and to Colin Smith (Pathology, University of Edinburgh) for providing neuro-pathology information.
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Leaver, H.A., Rizzo, M.T. & Whittle, I.R. Glioma Cell Death: Cell–Cell Interactions and Signalling Networks. Mol Neurobiol 42, 89–96 (2010). https://doi.org/10.1007/s12035-010-8135-3
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DOI: https://doi.org/10.1007/s12035-010-8135-3