Topical application of Rosa multiflora root extract improves atopic dermatitis-like skin lesions induced by mite antigen in NC/Nga mice.

The roots of Rosa multiflora THUNB. (RM) has been used in oriental traditional medicines as remedies for scabies, rheumatic arthralgia and stomatitis which were practicably related with today's inflammatory and allergic diseases. In the present study, we evaluated whether RM root extract (RME) and its major constituent, 2-(3,4-dihydroxyphenyl)-6-(4-hydroxyphenyl)-8-(2,4-dihydroxyphenyl)-2,3-trans-6,7-cis-7,8-trans-3,4,7,8-tetrahydro-2H,6H-pyrano[2,3-f] chromene-3,7,9-triol (RM-3) belongs to condensed tannins, improve atopic dermatitis (AD)-like skin lesions in NC/Nga mice induced by mite antigen. Topical application of RME as well as RM-3 improved skin severity and suppressed mRNA levels of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) on skin tissues, in addition, significantly reduced T helper 2 (Th2) immune responses via interleukin 10 (IL-10) up-regulation. Thus, RME, contains lots of condensed tannins such as RM-3 which possesses potent anti-inflammtory and immune-modulatory effects, may be useful for treatment of skin allergies and can be developed as new alternative herbal therapy against AD.

Identification of a novel HLA-B*40 variant allele, B*40:405 by next-generation sequencing.

The new allele, HLA-B*40:405 differs from B*40:02:01:01 by one nucleotide substitution at codon 304.

Two new phenolic compounds from the leaves of Alnus sibirica Fisch. ex Turcz.

Two new phenolic compounds, 4-O-glucopyranosyl-5-O-caffeoylshikimic acid (1) and 2,3-digalloyl oregonin (2), were isolated along with eight known phenolic compounds (3-10) from an 80% acetone extract of Alnus sibirica leaves. The chemical structures of these compounds were elucidated using 1D/2D nuclear magnetic resonance and high resolution-MS. The anti-oxidative activities of these compounds were determined by assaying their 1,1-diphenyl-2-picrylhydrazyl radical and nitroblue tetrazolium superoxide anion scavenging activity. All of the isolated phenolic compounds (1-10) exhibited potent anti-oxidative activities. In particular, 2 and 4, which are diarylheptanoids, and 10 which is ellagitannin exhibited excellent anti-oxidative activities with almost the same potency as that of the positive controls L-ascorbic acid and allopurinol.

Inhibition of matrix metalloproteinase-1 and type-I procollagen expression by phenolic compounds isolated from the leaves of Quercus mongolica in ultraviolet-irradiated human fibroblast cells.

The aim of this study was to investigate the effect of Quercus mongolica (QM) which induce anti-photoaging process of skin in vitro. Bioassay-guided isolation of 80 % Me2CO extract of the leaves of QM led to the isolation and identification of six known phenolic compounds: pedunculagin (1), (-)-epigallocatechin (2), (+)-catechin (3), quercetin 3-O-(6″-O-galloyl)-ß-D-glucopyranoside (4), kaempferol-3-O-ß-D-glucopyranoside-7-O-α-L-rhamnopyranoside (5) and kaempferol 3-O-(6″-galloyl)-ß-D-glucopyranoside (6). The effects of compounds 1-6 on expression of matrix metalloproteinase-1 (MMP-1) and type-I procollagen were further evaluated. Among them, compound 1 showed potent inhibitory effect on MMP-1 and the increased type-I procollagen synthesis in ultraviolet B-induced human fibroblast. These results suggest that pedunculagin, an ellagitannin, is a potential candidate for the prevention and treatment of skin aging.

Anti-inflammatory activity of sulfate-containing phenolic compounds isolated from the leaves of Myrica rubra.

Three sulfated phenolic compounds, juglanin B (11R)-O-sulfate (1), myricetin 3´-O-sulfate (2), and ampelopsin 3´-O-sulfate (3), were isolated from the leaves of Myrica rubra. Compound 1 was a new sulfated lignan, 2 was a new sulfated flavone, and 3 was a known sulfated flavone. The structures of the new compounds (1 and 2) were determined by acid hydrolysis and spectroscopic methods, including IR, FAB-MS, 1D and 2D NMR. The inhibitory activities of compounds 1-3 and their hydrolysates (1a-3a) against LPS-induced cytokine (TNF-α, IL-1ß, and IL-6) production in macrophage RAW 264.7 cells were evaluated. The 2 new compounds (1 and 2) and their aglycones (1a and 2a) significantly reduced LPS-induced expression of iNOS and COX-2 proteins.

Flavonoid constituents in the leaves of Myrica rubra sieb. et zucc. with anti-inflammatory activity.

The leaves of Myrica rubra sieb. et zucc. have been used in oriental traditional medicine for the treatment of burns, skin diseases, and as an antidiarrheal in China, Japan, and Korea. Activity guided isolation of the leaves of M. rubra has led to the isolation of five flavonoid: myricetin (1), myricitrin (2), myricetin 3-O-(2″-O-galloyl)-α-L-rhamnopyranoside (3), myricetin 3-O-(2″-O-galloyl)-ß-D-galactopyranoside (4), and quercetin 3-O-(2″-O-galloyl)-ß-D-galactopyranoside (5). All isolates were evaluated for their antioxidant potency against the superoxide anion (O2 (-)), and compounds 3-5 showed potent scavenging activities with 50 % inhibition concentration (IC50) values compared to the positive control, allopurinol. Compounds 1-5 were evaluated as inhibitors of various macrophage functions involved in the inflammatory process. These five compounds significantly and dose dependently inhibited lipopolysaccharide (LPS)-stimulated nitric oxide (NO), pro-inflammatory cytokines, and the protein levels of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) in LPS-stimulated RAW 264.7 macrophages. Our results suggest that galloyl flavonol glycosides (3-5) isolated from M. rubra might be beneficial for the treatment of inflammation-related diseases.

Anti-oxidative and anti-inflammatory activities of caffeoyl hemiterpene glycosides from Spiraea prunifolia.

Activity guided isolation of a Spiraea prunifolia extract yielded five caffeoyl hemiterpene glycosides: 4'-(6-O-caffeoyl-ß-D-glucopyranosyl)-2'-methyl butyric acid, 1-O-caffeoyl-6-O-(4'-hydroxy-2'-methylene-butyroyl)-ß-D-glucopyranoside, 1,2-O-dicaffeoyl-6-O-(4'-hydroxy-2'-methylene-butyroyl)-ß-D-glucopyranoside, 1-O-caffeoyl-6-O-(4'-caffeoyl-2'-methylene-butyroyl)-ß-D-glucopyranoside, and 1-O-caffeoyl-6-O-(4'-caffeoyl-3'-hydroxy-2'-methylene-butyroyl)-ß-D-glucopyranoside, and nine known compounds. Structures were elucidated by analysis of 1D and 2D NMR spectra and FAB-MS. To evaluate the anti-oxidative and anti-inflammatory properties of all fourteen compounds, DPPH radical scavenging, NBT superoxide scavenging, and inhibition of nitric oxide production in LPS-stimulated RAW264.7 cells were examined. Three of the caffeoyl hemiterpene glycosides exhibited potent anti-oxidative and anti-inflammatory activities compared with Vitamin C and l-NMMA, which were used as positive controls.