Abstract:
:Myricetin, a common dietary flavonoid, is widely distributed in fruits and vegetables. It is known to be a food supplement contributing to human health because of its immune modulatory function, and its antioxidation, antitumor, and anti-inflammatory properties. In the present study, myricetin was shown to directly inhibit cathepsin K activity, a highly potent collagenase, which is the predominant papain-like cysteine protease expressed in osteoclasts and synovial fibroblasts. It was shown that the IC50 of myricetin for the recombinant human cathepsin was 585.3 µmol/L. Also, myricetin proved to have positive effects in murine collagen-induced arthritis (CIA). Mice suffering from CIA received a daily dose of myricetin (25 mg/kg, per os). During the study, the clinical severity of the CIA and the histopathology were evaluated. Biomarkers related to the histological evaluation of cartilage degradation, namely deoxypyridinoline, cartilage oligomeric matrix protein and C-terminal telopeptide degradation product of type I collagen (CTX-I), were analyzed. Myricetin treatment reduced the levels of biomarkers indicative of cartilage degradation (p < 0.05) and ameliorated the symptoms of CIA in mice at the clinical level (p < 0.01). As the inhibitory effect of myricetin on cathepsin K activity induced beneficial effects on CIA in mice, further investigation of therapeutic interventions with myricetin in other mammals or in human rheumatoid arthritis is recommended.
journal_name
Immunopharmacol Immunotoxicoljournal_title
Immunopharmacology and immunotoxicologyauthors
Yuan X,Liu Y,Hua X,Deng X,Sun P,Yu C,Chen L,Yu S,Liu S,Pang Hdoi
10.3109/08923973.2015.1096942subject
Has Abstractpub_date
2015-01-01 00:00:00pages
513-9issue
6eissn
0892-3973issn
1532-2513journal_volume
37pub_type
杂志文章abstract::We previously showed that formation of pulmonary granulomas in mice in response to a mycobacterial glycolipid, trehalose 6,6'-dimycolate (TDM) is due to the action of TNF-α and not of IFN-γ. However, the mechanisms of formation and maintenance of pulmonary granulomas are not yet clear. The purpose of the present study...
journal_title:Immunopharmacology and immunotoxicology
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abstract::Natural killer (NK) activity plays an important role in host defense against tumors, especially once augmented by immunomodulators. It is likely that the modulation of NK cells is a reflection of the environment in which they reside. The current study was undertaken to characterize the response profile of lung interst...
journal_title:Immunopharmacology and immunotoxicology
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journal_title:Immunopharmacology and immunotoxicology
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journal_title:Immunopharmacology and immunotoxicology
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journal_title:Immunopharmacology and immunotoxicology
pub_type: 杂志文章,多中心研究,随机对照试验
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journal_title:Immunopharmacology and immunotoxicology
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journal_title:Immunopharmacology and immunotoxicology
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