(+)-Rhododendrol
(+)-Rhododendrol shows anti-inflammatory effects, it can suppress the NO production by activated macrophages in vivo.
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24 months(2-8C).
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Planta Med. 1998 Oct;64(7):598-602.
(+)-rhododendrol and epi-rhododendrin suppress the NO production by activated macrophages in vivo.[Pubmed:
9810263 ]
METHODS AND RESULTS:
In this study, we investigated the effect of (+)-Rhododendrol (1) and epi-rhododendrin (2) isolated from Acer nikoense Maxim. (Aceraceae) on nitric oxide (NO) production in mouse peritoneal macrophages elicited by bacillus Calmette-Guérin and in vitro stimulated by lipopolysaccharide. The NO production was not affected by an oral administration of methanol extract at a dose of 100 mg/kg/day. However, the AcOEt soluble fraction significantly reduced the NO production. (+)-Rhododendrol (1) isolated as an active substance from the AcOEt fraction suppressed the NO production. epi-Rhododendrin (2), the glucoside of (+)-Rhododendrol (1) isolated from the n-BuOH fraction, also suppressed the NO production.
CONCLUSIONS:
As NO is one of the critical mediators in inflammation, these results suggest that (+)-Rhododendrol (1) and epi-rhododendrin (2) contribute in part to the anti-inflammatory effect of A. nikoense.
