반지련 (Scutellaria barbata D. Don) 추출물이 lipopolysaccharide에 의해 활성화된 대식세포에 미치는 영향

초록

Scutellaria barbata was examined to evaluate its modulatory effects on the functional activation of macrophages under lipopolysaccharide (LPS) treatment. To do this, hot water extract (Sb-HWE) was prepared from Scutellaria barbata and several inflammatory parameters such as nitric oxide (NO) production, phagocytosis, reactive oxygen species (ROS) determination and intracellular signaling pathway were selected to be tested. Sb-HWE strongly blocked NO production in LPS-activated RAW264.7 cells in a dose-dependent manner. However, it did not suppress inducible NO synthase (iNOS). In agreement, Sb-HWE did not diminish inflammatory signaling composed of NF-κB and its upstream activation signaling enzymes such as Akt and IκBα. Sb-HWE protected RAW264.7 cells from LPS-induced cytotoxicity up to 80% at 400㎍/㎖. Furthermore, this extract blocked phagocytic uptake of FITC-dextran, while sodium nitroprusside (SNP)- induced ROS generation in RAW264.7 cells was not decreased. Therefore, our data suggest that Sb-HWE may have differential immunoregulatory function depending on macrophage-mediated immune responses.

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