Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Specific Interaction of Rat Vanilloid Receptor, TRPV1 with Rab11-FIP3

Rat 바닐로이드 수용체 TRPV1과 Rab11-FIP3의 특이적 결합

  • Received : 2010.11.22
  • Accepted : 2011.01.13
  • Published : 2011.01.31
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Abstract

Vanilloid receptor TRPV1 (known as capsaicin channel, transient receptor potential vanilloid 1) is known to be a key protein in the pain signal transduction. However, the proteins controlling the activity of the channel are not much known yet. Recently mouse Rab11-FIP3 (Rab11-family interaction protein 3) was found and reported to interact with rat TRPV1. Rab11 has been shown to play a key role in a variety of cellular processes including plasma membrane recycling, phagocytosis, and transport of secretory proteins from the trans-Golgi network. Therefore, Rab11-FIP3 was proposed to be involved in the membrane trafficking of TRPV1. In this study, the unreported rat Rab11-FIP3 was yet cloned in order to show the specific interaction of the TRPV1 and Rab11-FIP3 in the same species of rat and to examine the membrane trafficking of TRPV1. The result showed that rat Rab11-FIP3 is expected to have 489 amino acids and showed 80% identity with that of human and over 90% identity with that of mouse. Rab11-FIP3 was found to be expressed in heart, brain, kidney, testis using northern and western blot analyses. We also found that rat Rab11-FIP3 was colocalized with rat TRPV1 but not with TRPV2 of same family in the rat brain by using immunohistochemistry showing that two proteins interact specifically, suggesting the role of Rab11-FIP3 in the membrane trafficking.

캡사이신 채널로 알려진 바닐로이드 수용체 TRPV1 (캡사이신채널, Transient Receptor Potential Vanilloid 1)은 통증발현에서 중요한 역할을 하는 것으로 알려져 있다. 하지만 TRPV1의 활성조절에 관여하는 단백질에 대하여는 알려진 바가 많지 않다. 최근 rat TRPV1과 직접적으로 결합하는 단백질을 탐색하여 mouse Rab11-FIP3 (rab11-family interaction protein 3)가 rat TRPV1과 직접적으로 결합한다는 것이 보고되었다. Rab11은 여러 가지의 세포내 이동에 관여하는 것으로 보고되었다. 그러므로 Rab11-FIP3과의 결합을 통해 TRPV1의 세포막으로의 이동에 관여할 것으로 추측할 수 있다. 본 연구에서는 전에 보고된 연구가 mouse와 rat 이라는 다른 종의 단백질끼리의 결합이기 때문에 같은 종에서의 상호작용을 확인하고 Rab11-FIP3의 TRPV1의 세포막으로의 이동에서의 역할을 알아보고자 현재까지 동정되지 않은 rat의 Rab11-FIP3의 유전자를 GenBank 서열을 바탕으로 rat 뇌의 RNA 로부터 cDNA 를 클로닝하여 유전자를 분리하고 TRPV1 과의 관계를 세포생물학적으로 알아보았다. 연구결과 rat의 Rab11-FIP3는 489개의 아미노산 서열을 가지고 있으며 human과는 80%, mouse와는 90% 이상 아미노산 서열의 상동성을 보였다. 조직별 분포는 심장, 뇌, 간, 콩팥, 정소에서 발현되고 있는 것을 northern blot assay와 western blot assay 로 확인하였다. rat 의 뇌조직에서 TRPV1 과 Rab11-FIP3 단백질이 결합하여 colocalize 하는 것을 면역화학방법으로 확인하였다. 이 결합은 같은 family 의 TRPV2 와는 결합하지 않는 특이적 결합이므로 Rab11-FIP3 가 TRPV1 과 상호작용하여 세포막으로의 이동에 관여할 것이라는 것을 시사한다.

Keywords

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