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标题：Matrix Metalloproteinase-1 Inhibitory Activities of Morinda citrifolia Seed Extract and Its Constituents in UVA-Irradiated Human Dermal Fibroblasts
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作者：Megumi Masuda ; Kazuya Murata ; Shunsuke Naruto 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2012
卷号：35
期号：2
页码：210-215
DOI：10.1248/bpb.35.210
出版社：The Pharmaceutical Society of Japan
摘要：The objective of this study was to examine whether a 50% ethanolic extract (MCS-ext) of the seeds of Morinda citrifolia (noni) and its constituents have matrix metalloproteinase-1 (MMP-1) inhibitory activity in UVA-irradiated normal human dermal fibroblasts (NHDFs). The MCS-ext (10 μg/mL) inhibited MMP-1 secretion from UVA-irradiated NHDFs, without cytotoxic effects, at 48 h after UV exposure. The ethyl acetate-soluble fraction of MCS-ext was the most potent inhibitor of MMP-1 secretion. Among the constituents of the fraction, a lignan, 3,3′-bisdemethylpinoresinol (1), inhibited the MMP-1 secretion at a concentration of 0.3 μ M without cytotoxic effects. Furthermore, 1 (0.3 μ M ) reduced the level of intracellular MMP-1 expression. Other constituents, namely americanin A (2), quercetin (3) and ursolic acid (4), were inactive. To elucidate inhibition mechanisms of MMP-1 expression and secretion, the effect of 1 on mitogen-activated protein kinases (MAPKs) phosphorylation was examined. Western blot analysis revealed that 1 (0.3 μ M ) reduced the phosphorylations of p38 and c-Jun-N-terminal kinase (JNK). These results suggested that 1 suppresses intracellular MMP-1 expression, and consequent secretion from UVA-irradiated NHDFs, by down-regulation of MAPKs phosphorylation.
关键词：Morinda citrifolia;noni seed;matrix metalloproteinase-1 inhibitor;photoaging;3,3′-bisdemethylpinoresinol