THE present study was carried out to determine if iron chloride (FeCl3
) injections into the substantia nigra of guinea-pigs produced changes
in nigro-striatal uric acid levels. Two-weeks following unilateral in
jection of FeCl3 (185 nmol Fe3+), ipsilateral uric acid levels were in
creased 176% over contralateral levels in the substantia nigra. No eff
ect on striatal uric acid levels was observed. Iron chloride injection
produced a 74% depletion of dopamine levels in the ipsilateral striat
um. Ipsilateral/contralateral ratios were significantly decreased for
striatal dopamine and significantly increased for nigral uric acid whe
n compared with saline-injected controls. The results of this work ind
icate that FeCl3 injections into the substantia nigra of guinea-pigs p
roduce a significant, localized increase in tissue uric acid levels tw
o weeks after treatment.