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- W2071038418 abstract "In mammals high pressure of helium–oxygen (He–O2) breathing mixture leads to the high pressure neurological syndrome (HPNS) which includes a set of behavioural disorders such as locomotor and motor hyperactivity (LMA) and myoclonia. In rats, i.c.v. administrations of competitive NMDA antagonists decrease some of these symptoms suggesting that He–O2 pressure could enhance NMDA neurotransmission within the central nervous system. More recently, we have shown using microdialysis that the extracellular glutamate level is increased in the striatum by He–O2 pressure. Neurochemical data have suggested that this structure is probably involved in the LMA development but not in the myoclonia expression. When considering myoclonia, recent neuropathological studies performed at normal pressure in humans suggest that the globus pallidus extern (equivalent to the globus pallidus in the rat) could be involved in this behavioural disorder. The aim of this study was to compare the role of striatal and pallidal NMDA activity on the LMA development and the myoclonia expression in the model of rat exposed to 8 MPa of He–O2 mixture. The intrastriatal administration of d(−)-2-amino-7-phosphonoheptanoic acid (2-APH) (10 nmol/slide) reduced the LMA development but only slightly reduced myoclonia. In contrast, the intrapallidal administration of 2-APH (10 nmol/slide) reduced both LMA and myoclonia. These results suggest that the LMA development requires NMDA activity at both striatal and pallidal level. In contrast, the myoclonia expression mainly requires NMDA activity at pallidal level. Consequently, NMDA neurotransmission at input and output levels of the striato-pallidal pathway play different roles in some of the behavioural disorders induced by He–O2 pressure." @default.
- W2071038418 created "2016-06-24" @default.
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- W2071038418 date "2000-01-01" @default.
- W2071038418 modified "2023-10-06" @default.
- W2071038418 title "High pressure enhanced NMDA activity in the striatum and the globus pallidus: relationships with myoclonia and locomotor and motor activity in rat" @default.
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- W2071038418 doi "https://doi.org/10.1016/s0006-8993(99)02195-2" @default.
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