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J Korean Bal Soc > Volume 2(2); 2003 > Article
Journal of the Korean Balance Society 2003;2(2): 163-169.
일측 전정기관 손상 후 전정신경핵에서 c-Fos 단백발현에 대한 Ginkgo biloba의 영향
, , , , , , 최동옥1, 김선경1, 최명애1, 이문영1, 김민선1, 박은호2, 박병림1
원광대학교 의과대학 생리학교실 및 전정와우기관연구센터1, 베스트 이비인후과2
Effect of Ginkgo biloba on Expression of c-Fos Protein in the Vestibular Nuclear Complex following Unilateral Labyrinthectomy in Rats
Dong Ok Choi, Sun Kyung Kim, Myung Ae Choi, Moon Young Lee, Min Sun Kim, Eun Ho Park, Byung Rim Park
1Department of Physiology, Wonkwang University School of Medicine and Vestibulocochlear Research Center at Wonkwang University, Iksan 570-749, Korea. byungp@wonkwang.ac.kr
2Best ENT's Clinic, Kwangju 503-310, Korea.
ABSTRACT
Background and Objectives:   The neuroprotective effect of Ginkgo biloba has been demonstrated in several in vivo and in vitro models. The effect of Ginkgo biloba on vestibular compensation following unilateral labyrinthectomy (UL) was investigated. Material and
Method:   Spontaneous nystagmus and c-Fos protein expression were measured following UL in Sprague-Dawley rats with pretreatment of Ginkgo biloba (50 mg/kg, i.p.).
Results:   After pretreatment with Ginkgo biloba (50 mg/kg, i.p.) expression of c-Fos protein in the vestibular nuclear complex and frequency of spontaneous nystagmus were measured till 24 hours after UL. UL produced spontaneous nystagmus with frequency of 124±2.2 beats/min at post-op 2 hrs and 70±3.1 beats/min at post-op 24 hrs. Pretreatment with Ginkgo biloba significantly decreased the frequency of spontaneous nystagmus till post-op 24 hrs compared to control group (p<0.05). UL produced marked expression of c-Fos protein in bilateral medial vestibular nucleus, inferior vestibular nucleus, and superior vestibular nucleus, and the number of expression was significantly higher in contralateral vestibular nuclei to the lesion than ipsilateral vestibular nuclei at post-op 2 hrs (p<0.01). The number of c-Fos protein expression was decreased with time and significantly higher in ipsilateral vestibular nuclei than contralateral ones at post-op 24 hrs (p<0.01). Pretreatment with Ginkgo biloba significantly decreased the number of c-Fos protein expression following UL (p<0.01) and abolished the asymmetry of c-Fos protein expression in bilateral vestibular nuclei at post-op 24 hrs.
Conclusion:   These results suggest that Ginkgo biloba may facilitate vestibular compensation following UL through modulation of neurotransmitters and neuroprotective effects.
Keywords: Vestibular compensation; Ginkgo biloba; c-Fos; Spontaneous nystagmus; Vestibular nuclei
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