Anti-neuroinflammatory diterpenoids from the endangered conifer <i><i>Podocarpus imbricatus</i></i>
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Ten diterpenoids including three new abietanes (<b>1</b>–<b>3</b>) were isolated from the twigs and needles of <i>Podocarpus imbricatus</i>, an endangered conifer growing in a Cantonese garden. The new structures were established by means of spectroscopic methods. Among the isolates, 3<i>β</i>-hydroxy-abieta-8,11,13-trien-7-one (<b>5</b>), decandrin G (<b>6</b>), and 7,15-pimaradien-18-oic acid (<b>8</b>) showed significant anti-neuroinflammatory activities by inhibiting the overproduction of nitric oxide (NO) in lipopolysaccharide (LPS)-stimulated murine BV-2 microglial cells, with IC<sub>50</sub> values of 3.7, 11.1, and 4.5 μM, respectively.
从生长于广东园林的濒危针叶树种鳞叶罗汉松(Podocarpus imbricatus)的嫩枝及针叶中,分离得到10个二萜类化合物(diterpenoids),其中包含3个全新的松香烷型二萜(abietanes)(编号1~3)。上述新化合物的结构通过波谱学方法得以确证。在所分离得到的化合物中,3β-羟基-松香烷-8,11,13-三烯-7-酮(化合物5)、decandrin G(化合物6)以及7,15-海松二烯-18-羧酸(化合物8)可通过抑制脂多糖(lipopolysaccharide, LPS)诱导的小鼠BV-2小胶质细胞中一氧化氮(nitric oxide, NO)的过量生成,展现出显著的抗神经炎症活性,其半数抑制浓度(IC50)分别为3.7、11.1及4.5 μM。




