Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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PKC Isotype that Affects the Interaction of HRF with Na, K-ATPase

Na,K-ATPase와 IgE-Dependent Histamine Releasing Factor의 결합에 영향을 미치는 Protein Kinase C Isotype에 관한 연구

  • 손원주 (이화여자대학교 약학대학) ;
  • 이경림 (이화여자대학교 약학대학)
  • Published : 2005.12.01
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Abstract

IgE-dependent histamine releasing factor (HRF), previously known as P23/P21 or translationally controlled tumor protein (TCTP), induces the degranulation of histamine in mast cell and basophil. Yeast two hybrid results showed that HRF interacts with the alpha subunit of Na, K-ATPase, suggesting that HRF is a regulator for governing the activity of Na, K-ATPase. In this study, we examined the interaction of HRF and Wa,K-ATPase after treatments of various PKC isotype inhibitors. Membrane fractionation, pull-down assay and immunoprecipitation results showed that PKC $\alpha,\;PKC\;\beta,\;\delta$ subunits are involved in the phosphorylation of HRF. However, these results did not correlate with the results of histamine release assay since histamine release assay results suggested that some PKC isotype inhibitors induced the histamine release in RBL-2H3 cell.

본 실험에서는 MRF가 다량 존재하는 RBL-2H3 세포주에 다양한 PKC isotype별 억제제를 처리하여 in vitro상에서 Na, K-ATPase $\alpha$1L3를 이용한 pull-down assay와 RBL-2H3 세포를 이용한 membrane fractionation을 실시하였다. 그 결과 HRF는 in vitro에서 $\alpha$1L3와 결합한다는 사실을 재확인 할 수 있었고 실제 세포주 내에서 Na,K-ATPase와 결합한다는 것을 알 수 있었다. 사용한 약물로부터 PKC $\alpha,\;\beta,\;\delta$뿐 아니라 protein phosphatase 2B(PP2B)도 HRF와 $\alpha$1L3의 결합에 관여한다는 사실을 알 수 있었다. 또한 이들 PKC, PP2B에 의해 인산화된 HRF 분자는 cytosolic fraction으로 이행할 수 있으며 이러한 결과는 탈인산화된 HRF가 Na,K-ATPase와 결합하여 Na, K-ATPase의 기능을 조절한다고 추정할 수 있다. 그러나 약물자체가 histamine 분비에 영향을 미칠 수 있으며 cytosolic HRF보다 exocytosis된 HRF가 histamine를 더 분비하도록 할 수 있으므로, 약물을 전처리한 세포에 외부에서 HRF를 첨가하여 histamine이 유리되는 정도가 어떻게 변화하는지를 HRF를 가하지 않은 결과와 비교해야 할 것이다.

Keywords

References

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