Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of Exercise Preconditioning on the Expression of NGF, Synapsin I, and ChAT in the Hippocampus of Socially Isolated Rats

사회적으로 고립된 쥐의 해마에서 NGF와 Synapsin I, ChAT의 단백질 수준에 미치는 사전운동효과

  • Hong, Young-Pyo (Department of Health and Exercise Science, Korea National Sport University) ;
  • Kim, Hyun-Tae (Department of Health and Exercise Science, Korea National Sport University)
  • 홍영표 (한국체육대학교 한국체육대학교) ;
  • 김현태 (한국체육대학교 한국체육대학교)
  • Received : 2012.05.23
  • Accepted : 2012.08.29
  • Published : 2012.09.30
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Abstract

The purpose of this study was to investigate the effect of exercise preconditioning (EPC) on nerve growth factor (NGF), synapsin I, and choline acetyltransferase (ChAT) in the hippocampus of rats subjected to social isolation (SI). We randomly assigned four groups of male Sprague-Dawley (SD) rats (n=32) to the following treatments: GC: group housing control; IC: isolation control; GE: group housing exercise; IE: isolation exercise (n=8 each group). The rats underwent EPC 5 days a week for 8 weeks, and the speed of the treadmill was gradually increased (grade $0^{\circ}C$). After EPC, they were immediately subjected to SI for 8 weeks. The results showed that the protein levels of NGF, synapsin I, and ChAT in the hippocampus were significantly decreased in the IC group (p<0.05) compared with the GC group. However, these protein levels were significantly higher in the IE group (p<0.05). These results show that EPC may buffer the decline of function in the hippocampus by ameliorating the reduction in NGF, synapsin I, and ChAT induced by SI.

본 연구는 사회적 고립 스트레스로 인한 해마에서의 nerve growth factor (NGF), Synapsin I 및 choline acetyltranferase (ChAT) 감소에 있어서 사전운동경험(exercise preconditioning: EPC)이 미치는 영향을 규명하고자 실시되었다. 목적을 위해 Sprague-Dawley (SD) 쥐(수컷, 22주령, $500.1{\pm}48.41$ g)를 이용해 크게 통제집단(Con)과 운동(Ex)집단으로 구분하여 운동(트레드밀, 5일/주, 최대 18-20 m/min; 50분까지 점진적 증가, 경사 없음, 8주)을 적용하였으며, 이후 각각 사회적 고립(Isolation, 8주)을 적용하여 분석하였다(Group/Con: GC, Group/Ex: GE, Isolation/Con: IC, Isolation/Ex: IE, 각 집단별 n=8). 실험결과, IC집단에서 GC집단에 비해 해마에서 NGF, Synapsin I 및 ChAT가 유의하게 감소한 것으로 나타났다. 반면 IE집단에서 IC집단에 비해 NGF, Synapsin I 및 ChAT의 감소가 유의하게 개선된 것으로 나타났다. 이상의 결과 사회적 고립에 의한 해마에서의 NGF, Synapsin I 및 ChAT 단백질 감소는 EPC에 의해 개선되며, 이를 통해 해마의 기능 저하를 일부 완충 시킬 수 있을 것으로 판단된다.

Keywords

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