흰쥐에서 출생 전의 Nitric Oxide Synthase 억제제의 노출이 출생 후의 MK-801에 의해 유도된 행동 민감성에 미치는 영향
Effects of Prenatal Exposure to Nitric Oxide Synthase Inhibitor on MK-801-Elicited Behavioral Sensitivity in Postnatal Rats
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목 적 본 연구는 신경세포의 성장과 이동에 영향을 미치는 NOS 억제제를 임신 중에 투여 받은 어미 쥐에서 태어난 쥐를 대상으로, NMDA 수용체의 비경쟁적 길항제인 MK-801에 의한 운동 활성의 변화를 알아보고, 항정신병약물이 MK-801에 의해 유도된 행동 변화에 미치는 영향을 평가하여, 신경발달학적 측면에서 정신분열병의 병인을 구명해보고자 함이 본 연구의 목적이다. 방 법 체중 200~250 gm의 암컷과 수컷 Sprague-Dawley계 흰쥐를 같은 사육상자 내에서 물과 사료를 자유로이 섭취하게 하면서 임신을 유도하였다. 임신 후기의 어미 쥐를 세군으로 나누고 제 1 실험군에는 Nω-nitro-L-arginine (L-NA) 25 mg, 제 2 실험군에는 L-NA 40 mg을, 세번째 대조군에는 생리적 식염수를 투여하였다. 생후 5주째에 MK-801을 복강 내로 1회 투여해서 대조군과 실험군 간에 있어서 약물의 감수성의 차이를 Neurovision analysis라는 자동분석프로그램을 이용해서 행동 변화를 평가하였다. 다음으로 각 군에 haloperidol과 clozapine을 전처치하고 10분 후에 MK-801을 투여하고 행동 변화를 측정하여 MK-801 감수성에 미치는 효과의 차이를 확인하였다.
Abstract
Objectives:The aim of the present study was to investigate the role of prenatal exposure to NOS (nitric oxide synthase) inhibitor during the 3rd trimester of pregnancy on MK-801-elicited behavioral sensitivity in postnatal juvenile rats and the effect of an antipsychotic drug on the change in MK-801-elicited behavioral sensitivity in an attempt to elucidate the participation of NO (nitric oxide) in the pathophysiology of schizophrenia. Methods:L-NA (N-nitro-L-arginine, 25 mg/kg, 40 mg/kg) was injected intraperitoneally in pregnant Sprague-Dawley rats during the 3rd trimester of pregrancy. On postnatal day 35, MK-801-elicited behavioral sensitivity was measured using Neurovision Analysis (automatic motor analysis program). Animals were pretreated with haloperidol or clozapine as a antipsychotic drug before administration of MK-801. Statistical tests of drug effects were performed using ANOVA. A value producing p<0.05 was considered to be significant. Results:MK-801-elicited locomotor activity was significantly increased with prenatal exposure to L-NA in postnatal rats. The change in MK-801-elicited behavioral sensitivity was significantly diminished by pretreatment with haloperidol and clozapine. Conclusion:These findings suggest that NO may in part play an important role in neurodevelopment in that prenatal exposure to NOS inhibitor can influence MK-801-elicited behavioral sensitivity in postnatal rats. These results also indicate that the neurodevelopmental abnormality may predispose schizophrenia. (J Korean Neuropsychiatr Assoc 2007;46(1):13-18)
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