Ion channels and amino acid transporters support the growth and invasion of primary brain tumors.
The malignant growth of glial support cells causes gliomas, highly invasive, primary brain tumors that are largely resistant to therapy. Individual tumor cells spread by active cell migration, invading diffusely into the normal brain. This process is facilitated by Cl- channels that endow glioma cells with an enhanced ability to quickly adjust their shape and cell volume to fit the narrow and tortuous extracellular brain spaces. Once satellite tumors enlarge, their growth is limited by the spatial constraints imposed by the bony cavity of the skull and spinal column. Glioma cells circumvent this limitation by active destruction of peritumoral neural tissue through the release of glutamate, inducing peritumoral seizures and ultimately excitotoxic neuronal cell death. Hence, primary brain tumors support their unusual biology by taking advantage of ion channels and transporters that are designed to support ion homeostatic functions in normal brain.
Sontheimer
Harald
H
Department of Neurobiology and Civitan International Research Center, the University of Alabama at Birmingham, Birmingham, AL, USA. sontheimer@uab.edu
D026905:Amino Acid Transport Systems / Q000378:metabolism*; D000818:Animals; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology; D002455:Cell Division; D005910:Glioma / Q000378:metabolism* / Q000473:pathology; D018698:Glutamic Acid / Q000378:metabolism; D006801:Humans; D007473:Ion Channels / Q000378:metabolism*; D009361:Neoplasm Invasiveness
D026905:Amino Acid Transport Systems; D007473:Ion Channels; D018698:Glutamic Acid