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• W2742405131 abstract "A reduction in microglial activation and subsequent neurotoxicity may prove critical for neuroprotection in neurodegenerative diseases. We examined the expression and functionality of group III metabotropic glutamate (mGlu) receptors on microglia. Rat microglia express mRNA and receptor protein for group III mGlu receptors mGlu4, mGlu6, and mGlu8 but not mGlu7. Activation of these receptors on microglia with the specific group III agonists (L)-2-amino-4-phosphono-butyric acid (L-AP-4) or (R,S)-phosphonophenylglycine (RSPPG) inhibited forskolin-induced cAMP production, linking these receptors to the negative inhibition of adenylate cyclase. These agonists did not induce a fall in mitochondrial membrane potential or apoptosis in the microglia, suggesting that activation of these receptors is not in itself toxic to microglia. Fluorescence-activated cell sorting analysis revealed that activation of group III mGlu receptors induces a mild activation of the microglia, as evidence by their enhanced staining with ED1. However, this activation is not neurotoxic. Agonists of group III mGlu receptors reduced microglial reactivity when they were activated with lipopolysaccharide (LPS), chromogranin A (CGA) or amyloid peptide 25-35 (A25-35). Furthermore, L-AP-4 or RS-PPG treatment of microglia reduced their neurotoxicity after microglial stimulation with LPS or CGA but not A25-35. Similar results were obtained with microglial conditioned medium or in coculture, suggesting that the activation of microglial group III mGlu receptors may modulate the production of stable neurotoxins from the microglia. These results suggest that selective modulation of microglial group III mGlu receptors may provide a therapeutic target in neuroinflammatory diseases such as Alzheimer’s disease." @default.
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• W2742405131 date "2002-08-01" @default.
• W2742405131 modified "2023-09-24" @default.
• W2742405131 title "Activation of Microglial Group III Metabotropic Glutamate Receptors Protects Neurons against Microglial Neurotoxicity" @default.
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