Abstract
The concentration of uric acid [UA] in the extracellular fluid (ECF) estimated with in-vivo voltammetry and microdialysis data is compared for probes of different diameters from the day of implantation (acute) to several days (chronic) or even months after surgery. For small probes (diameter < 160 μm) the acute [UA] of ca. 5 μM decreased significantly to ca. 1 μM under chronic conditions. For larger probes (e.g., 320-μm diameter) the acute [UA] was also ca. 5 μM, but this value significantly increased to ca. 50 μM under chronic conditions. Associated with this difference in [UA], there were parallel differences in the extent of gliosis around the probes. These findings are discussed in terms of possible sources of extracellular UA and their implications for in-vivo monitoring techniques in behaving animals.
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