Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Expression of c-Jun N-Terminal Kinase (JNK)-Interacting Protein (JIP) in Cultured Rat Hippocampal Neurons

배양한 흰쥐 해마신경세포에서 c-Jun N-terminal kinase (JNK)-interacting protein (JIP)의 표현

  • Moon, Il-Soo (Department of Anatomy, College of Medicine, Dongguk University)
  • Published : 2007.12.30
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Abstract

c-Jun N-terminal kinase (JNK)-interacting protein 1 (JIP1), also known as Islet-brain 1 (IB1), is a scaffold protein that is highly expressed in neurons and pancreatic ${\beta}-cells$. In this study subcellular localization of JIP was investigated in cultured rat hippocampal neurons using an antibody that recognize all variants of JIP1, JIP-2 and JIP-3. The overall expression profile of JIP is punctate throughout soma and dendrites. Statistic analysis showed that $54.8{\pm}4.0%\;and\;94.1{\pm}4.5%$ of total JIP immunopuncta overlapped with those of excitatory postsynaptic markers SD-95 and ${\alpha}Camik$, respectively. In contrast, only $8.6{\pm}0.5%\;and\;7.3{\pm}0.5%$ of JIP clusters overlapped with those of inhibitory postsynaptic markers glycine receptor (GlyR) and gephyrin, respectively. JIP clusters overlapped or juxtaposed with SV2 but not GAD, markers for general and inhibitory nerve terminals, respectively. A substantial fraction $(29.3{\pm}1.0%)$ of flotillin immunopuncta, a marker for lipid rafts, clusters overlapped with those of JIP. In addition, JIP was highly expressed in some select ends of dendrites but minimal in axons. These data suggest important roles of JIP in excitatory postsynaptic sites, lipid rafts and dendritic ends.

c-Jun N-terminal kinase (JNK)-interacting protein 1(JIP1)은 비계단백질(scaffold protein)로서 신경 세포와 ??장${\beta}$세포에서 많이 발현된다. 본 연구에서는 배양한 흰쥐 해마신경세포에서 JIP1, JIP-2 및 JIP-3을 모두 인식하는 항체를 이용하여 이들의 세포내 표현을 조사하였다. 전반적으로 JIP은 세포체와 가지돌기에 반점 모양으로 표현되었다. 이 JIP 반점들을 통계적으로 분석한 결과 흥분성 연접후표지인 PSD95 및 ${\alpha}CaMKII$ 반점 과 각각 $54.8{\pm}4.0%$ 및 $94.1{\pm}4.5%$가 겹쳐졌다. 반면에 억제성 연접후표지인 그리신수용체 및 gephyrin 반점과는 각각 단지 $8.6{\pm}0.5%$ 및 $7.3{\pm}0.5%$만 겹쳐졌다. 한편 lipid raft의 표지인 flotillin 반점의 상당부분$(29.3{\pm}1.0%)$이 JIP 반점과 겹쳐졌다. 또한, JIP은 일부 가지돌기의 끝부분에 매우 강하게 발편되었으며 축삭에는 표현이 미미하였다. 이 결과들은 JIP 단백질이 흥분성 연접후구역, 일부 lipid raft, 그리고 일부 가지돌기 끝부분에 주로 위치함을 의미한다.

Keywords

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