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Sanghyun Lee, Hee-Seung Park,
Yohko Notsu,
Hyun Seung Ban,
Yong Pil Kim,
Kenji Ishihara,
Noriyasu Hirasawa,
Sang Hoon Jung,
Yeon Sil Lee,
Soon Sung Lim,
Eun-Hee Park,
Kuk Hyun Shin,
Toshio Seyama,
Jangja Hong,
Kazuo Ohuchi
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ABSTRACT: The extract of the root of Acanthopanax chiisanensis Nakai is used for the treatment of inflammation. To analyse the action mechanism of this extract, the effect of hyperin (quercetin-3-O-beta-d-galactose) isolated from the ethyl acetate fraction of the root of A. chiisanensis on nitrite production and induction of inducible nitric oxide synthase (iNOS) in lipopolysaccharide (LPS, 1 microg/mL)-stimulated rat peritoneal macrophages were examined. The effect of the structurally related compounds, isoquercitrin (quercetin-3-O-beta-d-glucose) and quercetin (an aglycone of the two compounds) isolated from the extract of the leaves of Vaccinium koreanum Nakai was also examined to compare the effect. It was shown that hyperin inhibited the LPS-induced iNOS expression and nitrite production. Of the three compounds, quercetin showed the most potent inhibitory activity. The phosphorylation of p44/42 mitogen activated protein kinase (MAPK), p38 MAPK and c-Jun N-terminal kinase (JNK) were also inhibited by these compounds. These findings suggested that hyperin in the extract of the root of A. chiisanensis inhibits nitric oxide (NO) production through inhibition of the expression of iNOS by attenuation of p44/p42 MAPK, p38 MAPK and JNK, and thus participates in the antiinflammatory activity of the extract.
Phytotherapy Research 09/2008; 22(11):1552-6. · 2.09 Impact Factor
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ABSTRACT: Beauvericins and enniatins are cyclohexadepsipeptide mycotoxins that exhibit phytotoxicity and insecticidal activities. In the present study, the production of beauvericin and newly found enniatins (H, I, and MK1688) was characterized in 28 Fusarium strains isolated from potato samples in Korea. The predominant Fusarium species in potato was F. oxysporum (53.6%). Fifteen strains of F. oxysporum and two strains of other Fusarium species produced beauvericin (at concentrations from 3.1 to 743.2 microg/g) in culture on rice. Enniatins H and I were produced by 3 and 11 strains at concentrations from 33.1 to 781.3 microg/g and from 6.5 to 730.3 microg/g, respectively. Five isolates produced enniatin MK1688 at concentrations from 4.6 to 432.6 microg/g. In particular, one isolate (No. 1501) identified as F. oxysporum and two other Fusarium strains (Nos. 804 and 910) produced all of the tested toxins. These results indicate that enniatins H, I, and MK1688 and beauvericin are produced by Fusarium isolates occurring on potato. We do not know if the toxins can accumulate in the environment since it was not demonstrated.
International Journal of Food Microbiology 04/2008; 122(3):296-301. · 3.33 Impact Factor
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ABSTRACT: Lamivudine is an effective therapy in chronic hepatitis B patients, but the emergence of resistant hepatitis B virus (HBV) mutants is a major concern. This study was performed to investigate whether serum viral DNA levels during lamivudine therapy are related with viral breakthrough in patients with chronic HBV infection.
This study consisting of 103 patients was performed retrospectively and prospectively. Follow-up duration was 24 months after lamivudine therapy. Serum HBV DNA levels were quantified by PCR-based assay every 6 months.
Cumulative rate of viral breakthrough was 0%, 19.4%, 36%, and 48.5% in 6, 12, 18, and 24 months respectively. The rate of viral breakthrough in 24 months increased as serum HBV DNA levels increased at 6 months. When serum HBV DNA levels were 2-3 log10, 3-4 log10, 4-5 log10, and 5 log10 copies/mL or more, the breakthrough rates were significantly higher than that of the HBV DNA level less than 2 log10 copies/mL. The relative risks were 1.10, 1.93, 2.69, 3.21 respectively (P<0.001). The viral breakthrough rate also increased as serum HBV DNA levels at 12 months increased. When the HBV DNA levels were 2-3 log10, 3-4 log10, 4-5 log10, and 5 log10 copies/ mL or more, the breakthrough rate were significantly higher than those of HBV DNA level less than 2 log10 copies/mL. The relative risks were 2.42, 4.35, 3.73, 2.61, respectively (P=0.002).
The serum HBV DNA levels at 6 months and 12 months during lamivudine therapy can be closely correlated with the rate of viral breakthrough in 24 months.
The Korean Journal of Hepatology 07/2006; 12(2):173-83.
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ABSTRACT: A new steryl ester, artemisterol (1), together with known compounds alpha-amyrin (2), beta-amyrin (3), beta-sitosterol (4), 5,6,7-trimethoxycoumarin (5), and 6-methoxy-7,8-methylenedioxycoumarin (6), were isolated from the methanolic extracts of Artemisia apiacea by repeated column chromatography. The structure of 1 was elucidated as stigmast-5-en-3beta,29-diol 29-p-hydroxycinnamate by spectral data analyses.
Journal of Asian Natural Products Research 10(3-4):313-6. · 0.94 Impact Factor
