Korean Red Ginseng saponin fraction modulates radiation effects on lipopolysaccharide-stimulated nitric oxide production in RAW264.7 macrophage cells
Lee, Young Ji | Han, Jeong Yoon | Lee, Chang Geun | Heo, Kyu | Pak, Se-il | Park, Yoo Soo | Kim, Joong Sun | Yang, Kwang-mo | Lee, Ki-Ja | Kim, Tae-Hwan | Rhee, Man Hee | Kim, Sŭng-dae
In previous work, we reported that Korean Red Ginseng saponin fraction (RGSF) showed anti-inflammatory activities in vitro and in vivo.The present study investigated the radioprotective properties of RGSF by examining its effects on ionizing radiation (IR)-enhanced and lipopolysaccharide (LPS)-mediated inflammatory responses in murine macrophage cells.RGSF induced strong downregulation of IR-enhanced and LPS-induced proinflammatory responses such as nitric oxide (NO) production (Inhibitory Concentration 50 (IC₅₀) = 5.1 ± 0.8 μM) and interleukin-1β levels. RGSF was found to exert its radioprotective effects by inhibition of a signaling cascade that activated checkpoint kinase 2–nuclear factor-κB. In addition, RGSF strongly inhibited IR-enhanced LPS-induced expression of hemoxyganase-1, implying that the latter may be a potential target of RGSF.Taken together, our data suggest that RGSF can be considered and developed for use as an effective radioprotective agent with minimal adverse effects.
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