Abstract

KU812F 세포는 세포표면에 <TEX>$Fc{\varepsilon}RI$</TEX>을 발현하고 있어, IgE를 매개로 한 알러지 반응에 있어 중요한 역할을 담당하고 있는 것으로 알려져 있다. KU812F 세포를 이용하여, <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain 발현에 있어 구절초 에탄올 추출물의 저해효과를 조사하였다. 본 연구 결과, <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain의 세포표면 발현량 및 mRNA수준을 구절초 추출물이 감소시키는 것을 flow cytometry 및 RT-PCR로 각각 확인하였다. 또한, 구절초 추출물은 CRA-1 자극에 의한 히스타민 유리를 농도 의존적으로 억제시켰다. 이러한 결과는 구절초 추출물이 <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain 발현을 감소시킴으로써, 히스타민 유리가 억제되고, 이를 통해 항알러지 활성에 기여하는 것으로 생각된다. Human basophilic KU812F cells express a high affinity for IgE receptor, <TEX>$Fc{\varepsilon}RI$</TEX>, which plays an important role in immunoglobulin E (IgE)-mediated allergic reactions. Using the human basophilic KU812F cells, we assessed the inhibitory effects of the ethanolic extract from Chrysanthemum zawadsaki(CZ) on <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain expression. Flow cytometric analysis showed that cell surface <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain expression was suppressed when the cells were cultured with CZ extract. RT-PCR analysis showed that the mRNAs for <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain decreased by the treatment of CZ extract. Moreover, CZ extract was also observed to result in a reduction in the release of histamine from anti-<TEX>$Fc{\varepsilon}RI$</TEX> antibody (CRA-1)-stimulated cells. These results suggest that CZ extract may exert anti-allergic activity through down-regulation of <TEX>$Fc{\varepsilon}RI$</TEX> <TEX>${\alpha}$</TEX> chain expression and a subsequent decrease in histamine release.

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