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In Vivo EPR Estimation of Bilateral Hippocampal Antioxidant Ability of Rats with Epileptogenesis Induced by Amygdalar FeCl 3 Microinjection
Author(s) -
Ueda Yuto,
Yokoyama Hidekatsu,
Nakajima Akira,
Takaki Mayuko,
Nagatomo Keiko,
Doi Taku,
Willmore L. James
Publication year - 2007
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/j.1528-1167.2007.01141.x
Subject(s) - microinjection , electron paramagnetic resonance , hippocampus , chemistry , in vivo , epileptogenesis , hippocampal formation , antioxidant , amygdala , nuclear magnetic resonance , nitroxide mediated radical polymerization , medicine , endocrinology , anesthesia , neuroscience , biophysics , biochemistry , biology , organic chemistry , polymer , physics , microbiology and biotechnology , radical polymerization , copolymer
Summary: Purpose: To measure the neural antioxidant function in the hippocampus of rats with epileptogenesis induced by microinjection of FeCl 3 into the amygdala using the decay rate of the nitroxide radical as estimated by L‐band electron paramagnetic resonance (EPR) spectroscopy. Materials and Methods: Region‐selected intensity determination (RSID) was used for the estimation of the nitroxide decay ratio. It is possible to estimate the in vivo hippocampal antioxidant ability using the half‐life of the EPR signal of the blood–brain barrier‐permeable nitroxide radical. Rats were microinjected with aqueous FeCl 3 into the right amygdaloid body. Recording from chronically implanted depth electrodes showed the development of spike discharges with recurrent seizures arising from amygdalar regions with propagation into both hippocampi. Rats with unilateral aqueous FeCl 3 lesions were injected systemically with the nitroxide radical and then had EPR for RSID estimation at 5, 15, and 30 days after the iron salt injection. Results: The in vivo antioxidant ability of the dorsal hippocampus was significantly decreased bilaterally in animals with FeCl 3 ‐induced seizures when compared to the control. Conclusion: Neural antioxidant function in the hippocampi of rats with chronic seizures induced by amygdalar FeCl 3 was decreased early and both ipsilaterally and bilaterally.