Mossy Fiber Synaptic Reorganization of Dentate Gyrus by ?Pentylenetetrazol Kindling Rats

J Korean Neurol Assoc > Volume 13(2); 1995 > Article

Journal of the Korean Neurological Association 1995;13(2): 239-248.

백서에서 pentylenetetrazol kindling 에 의한 치상회 태상섬유의 ?시납스 재구성

이상도, 이태희, 박영춘

계명대학교 신경과

Mossy Fiber Synaptic Reorganization of Dentate Gyrus by ?Pentylenetetrazol Kindling Rats

Sang Doe Yi, M.D., Tae Hee Lee, M.D., Young Choon Park, M.D.

Department of Neurology, Keimyung university School of medicine

Abstract

"Recent studies have revealed that mossy fiber(MF) axons of dentate granule cells undergo synaptic reorganization in both electrical kindling models of temporal lobe epilepsy (TLE) and human TLE. This synaptic reorganization has been demonstrated by Timm histochemistry which selectively labels synaptic terminals of MF because of unusually high zinc content. Of MF. In electrical kindling model and human TLE Timm granules were distributed throughout the supragranular layer of dentate gyrus where they are not normally present. These supragranular Timm granules are regarded as MF synaptic reorganization. Kindling model of generalized epilepsy can be made by repeated intraperitoneal injections of subconvulsive dosage of pentylenetetrazol (PTZ). The present study is designed to test the hypothesis that MF synaptic reorganization might be developed in PTZ kindling model In this study, the supragranular Timm granules by Timm histochemistry were scored and depth EEG was recorded in dentate gyrus of various stages of PTZ kindling rats. The scores of supragranular Timm granules were 0. 33+0.17 in stage I seizure (n=9) ; 0. 38 + 0. 14 in stage II seizure (n=13) ; 0. 44 + 0. 18 in stage III seizure (n=9) ; 1. 40+0.16 in 3 consecutive or total 5-7 stage TV or V seizure (n=10) ; 1. 86+ 0.26 in 7-10 consecutive or total 10-15 stage IV or V seizure (n=7) ; 2.50+0.22 in 1215 consecutive or total 20-30 stage IV or V seizure (n=6) ; and 0. 30+0.15 in saline injection controls (n=lo). Statistical analysis showed the supragranular Timm scorwere significantly higher in stage IV or V seizure than in control and in stage 1, I or, I seizure (P