Inhibitory activity of nitric oxide production in RAW 264.7 cells of daldinals A–C from the fungus Daldinia childiae and other metabolites isolated from inedible mushrooms |
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Authors: | Dang Ngoc Quang Liva Harinantenaina Takashi Nishizawa Toshihiro Hashimoto Chie Kohchi Gen-Ichiro Soma Yoshinori Asakawa |
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Affiliation: | (1) Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan;(2) Institute for Health and Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan;(3) Institute of Drug Delivery Systems, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan;(4) Faculty of Chemistry, Hanoi University of Education, 136 Xuan Thuy Road, Cau Giay, Hanoi, Vietnam |
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Abstract: | Three benzophenone derivatives, daldinals A–C, from the Japanese fungus Daldinia childiae were evaluated for their inhibitory activity of nitric oxide (NO) production stimulated by lipopolysaccharide (LPS) in RAW 264.7 cells. They strongly suppressed the LPS-induced production of NO with IC50 values of 15.2, 4.6 and 6.4 μM, respectively. To clarify the mechanism involved, total RNA extraction, followed by reverse-transcribed, polymerase chain reaction (PCR) for inducible nitric oxide synthase (iNOS) mRNA and finally electrophoresis on agarose gel were performed. These experimental results suggest that the inhibition of the LPS-induced NO production of daldinal B is due to the inhibition of iNOS mRNA synthesis. Further, their biological activities were compared with those of other metabolites obtained during our studies on biologically active substances from inedible fungi in recent years. |
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Keywords: | Daldinia childiae Nitric oxide inhibitory activity RAW cells iNOS Daldinal |
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