title: Polyoxypregnane glycoside from Dregea volubilis extract inhibits IL-1β-induced expression of matrix metalloproteinase via activation of NF-κB in human chondrocytes.
abstract: Interleukin-1β (IL-1β) induces the expression of matrix metalloproteinases (MMPs) implicated in cartilage and joint degradation in osteoarthritis (OA) and rheumatoid arthritis (RA). Polyoxypregnane glycoside (PPG), active compound was identified from Dregea volubilis extract by chemical analysis, shown to exert chondroprotective effects in cartilage explant models. However, no studies have been undertaken for the molecular investigation of whether PPG constituents protect the human articular chondrocyte (HAC). In the present studies, HAC was co-treated with IL-1β and PPG. The expression of MMPs, type II collagen, phosphorylation of mitogen-activated protein kinases (MAPKs) and NF-κB signaling pathway were determined by Western immunoblotting. PPG (6.25-25 μM) decreased the IL-1β-induced HA release from chondrocyte to culture medium. The mode of action of PPG was likely mediated through inhibiting expression of MMP-1, -3 and -13 in the medium, which was associated with the inhibition of mRNA expression. PPG had no effect on IL-1β-induced phosphorylation of MAPK pathway. Conversely, PPG decreased phosphorylation of IκB kinase and IκBα degradation. Taken together, these results indicate that PPG may inhibit cartilage degradation in OA and may also be used as nutritional supplement for maintaining joint integrity and function.
authors.affiliation: Thailand Excellence Center for Tissue Engineering and Stem Cells, Chiang Mai University, Chiang Mai, 50200, Thailand.
authors.forename: Akanit
authors.initials: A
authors.lastname: Itthiarbha
authors.forename: Thanyaluck
authors.initials: T
authors.lastname: Phitak
authors.forename: Saksri
authors.initials: S
authors.lastname: Sanyacharernkul
authors.forename: Peraphan
authors.initials: P
authors.lastname: Pothacharoen
authors.forename: Wilart
authors.initials: W
authors.lastname: Pompimon
authors.forename: Prachya
authors.initials: P
authors.lastname: Kongtawelert
mesh_terms: D000818:Animals; D029062:Apocynaceae / Q000737:chemistry; D002478:Cells, Cultured; D019902:Chondrocytes / Q000166:cytology / Q000378:metabolism*; D024043:Collagen Type II / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D006027:Glycosides / Q000494:pharmacology; D006801:Humans; D053583:Interleukin-1beta / Q000008:administration & dosage / Q000037:antagonists & inhibitors*; D020782:Matrix Metalloproteinases / Q000235:genetics / Q000378:metabolism*; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D012503:Saponins / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D013552:Swine
chemical_list: C575295:12-0-benzoyl-8,11-ditigloyl-3,8,11,12-pentahydroxy-pregn-14-ol, 20-one 3-0-methyl-allopyranosyl(1-4)-thevetopyranoside; D024043:Collagen Type II; D006027:Glycosides; D053583:Interleukin-1beta; D016328:NF-kappa B; D010936:Plant Extracts; D012503:Saponins; D020929:Mitogen-Activated Protein Kinase Kinases; D020782:Matrix Metalloproteinases