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Adenosine A(2A) antagonism increases striatal glutamate outflow in the quinolinic acid rat model of Huntington's disease.

In the quinolinic acid (QA)-rat model of Huntington's disease (HD), 15 days after QA injection, striatal glutamate, measured by in vivo microdialysis, was unchanged while a significant decrease in adenosine occurred. The decrease in adenosine may depend on QA-induced striatal cell loss. Probe perfusion of the adenosine A(2A) receptor antagonist SCH 58261 significantly increased striatal glutamate outflow, suggesting a potential detrimental effect of A(2A) antagonism at later stages of the neurodegenerative process induced by QA.