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- W1971291327 abstract "The periaqueductal gray matter (PAG) is an important center in the modulation of behavioral responses during nociception and stress. In the present experiment, extracellular excitatory amino acid overflow in the PAG was measured every 30 s during noxious stimulation. A combination of in vivo brain microdialysis in freely moving rats and capillary zone electrophoresis with laser induced-fluorescence detection allowed us to detect short lasting changes of excitatory amino acid in dialysates. A formalin injection in the hindpaw of the rat increased glutamate, arginine and aspartate concentration in PAG dialysates. This increase was calcium and nerve impulse-dependent, suggesting neuronal and glial origin of glutamate and arginine, respectively. Handling, pinching or saline injection in the hind paw did not increase glutamate showing that this neurochemical phenomenon is related to painful and persistent noxious stimulation. The results suggest that a rapid excitation of the PAG occurs during noxious stimulation. The role of glutamate and arginine in analgesia is discussed." @default.
- W1971291327 created "2016-06-24" @default.
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- W1971291327 date "2000-08-01" @default.
- W1971291327 modified "2023-10-17" @default.
- W1971291327 title "Noxious stimulation increases glutamate and arginine in the periaqueductal gray matter in rats: a microdialysis study" @default.
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- W1971291327 doi "https://doi.org/10.1016/s0304-3959(00)00275-x" @default.
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