Regional distribution of 14C-zonisamide in rat brain.
Zonisamide (1,2-benzisoxazole-3-methane sulfonamide) is a new antiepileptic drug developed in Japan. This compound was proven to possess a strong inhibitory effect on convulsions of cortical origin, whether induced by electric or chemical stimuli. Regional distribution of 14C-zonisamide was investigated in rat brain using autoradiography. A high uptake of 14C activity was observed in the cerebral cortex and the midbrain. A pair-match analysis of primary motor cortex versus primary sensory cortex revealed a slightly higher uptake in primary motor cortex. In the cerebellum, a higher uptake was observed in the cortex than medulla. Sagittal section analyses revealed that a high uptake of 14C activity was observed in the cerebral cortex and colliculus, and a moderate uptake was seen in the cerebellum, thalamus, hypothalamus, and striatal body, thus suggesting the distribution of 14C-zonisamide is similar to that of flunitrazepam and phenytoin.
Mimaki
T
T
Department of Pediatrics, Osaka Medical College, Japan.
Tanoue
H
H
Matsunaga
Y
Y
Miyazaki
H
H
Mino
M
M
D000818:Animals; D000927:Anticonvulsants / Q000008:administration & dosage / Q000493:pharmacokinetics*; D001345:Autoradiography; D001921:Brain / Q000378:metabolism*; D007275:Injections, Intravenous; D007555:Isoxazoles / Q000008:administration & dosage / Q000493:pharmacokinetics*; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D000078305:Zonisamide
D000927:Anticonvulsants; D007555:Isoxazoles; D000078305:Zonisamide