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British Medical Bulletin 65:121-131 (2003)
© 2003 The British Council
Neuropathological imaging: in vivo detection of glial activation as a measure of disease and adaptive change in the brain
Molecular Neuropsychiatry, Departments of Neuropathology and Psychiatry, Charing Cross Hospital, Imperial College School of Medicine, and MRC Clinical Sciences Centre (PET Neurology), Hammersmith Hospital, London, UK
Glial cells form a structural and functional network with complex cellcell communication pathways that enable fast and slow signalling amongst themselves as well as with neurons. They exert regulatory influence on normal synaptic transmission and alter it in disease. It is becoming increasingly clear that an understanding of brain function in disease conditions requires a better account of the highly plastic, disease-associated changes in glial physiology in vivo. Particularly, microglia, the brain's ubiquitous but normally inconspicuous immune effector cell, are prominently involved in many brain diseases. They respond rapidly and in a territorially highly confined way to subtle, acute and chronic pathological stimuli. Detection of microglial activation provides diagnostically useful formal parameters of disease, such as the accurate spatial localisation, disease progression and the secondary neurodegenerative or adaptive changes remote from the primary site of disease. The latter has potential relevance for the understanding of disease-induced brain plasticity. Systematic attempts are now undertaken, using positron emission tomography and a ligand with relative selectivity for activated microglia, to develop generic imaging tools for a cellular in vivo neuropathology.
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