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• W1991549612 abstract "Extracts of the herb Tripterygium wilfordii hook f, the major component of which is triptolide, have been used in traditional Chinese medicine for the treatment of rheumatoid arthritis. Triptolide also exerts many other biological actions both in vitro and in vivo. The effect of this agent on collagen degradation by cultured corneal fibroblasts was examined.Rabbit corneal fibroblasts were cultured in three-dimensional gels of type I collagen and in the absence or presence of interleukin (IL)-1beta or triptolide. The extent of collagen degradation was determined by measurement of the amount of hydroxyproline generated by acid-heat hydrolysis of the culture supernatants. The activities of matrix metalloproteinase (MMP)-1 and plasmin were measured with the specific substrates thiopeptolide and S-2251, respectively. The release of MMPs into the culture supernatant was assessed by immunoblot analysis and gelatin zymography, and the abundance of MMP mRNAs in the cells was determined by reverse transcription and real-time polymerase chain reaction.Triptolide inhibited the IL-1beta-induced degradation of collagen by corneal fibroblasts in a dose- and time-dependent manner. Neither the activity of purified recombinant MMP-1 nor that of plasmin in culture supernatants was affected by triptolide. The IL-1beta-induced expression of MMP-1, -2, -3, and -9 by corneal fibroblasts was inhibited by triptolide at the protein or mRNA level.Triptolide inhibits collagen degradation by corneal fibroblasts by inducing downregulation of the production of MMPs, without directly affecting the collagenolytic activity of these enzymes." @default.
• W1991549612 created "2016-06-24" @default.
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• W1991549612 date "2003-12-01" @default.
• W1991549612 modified "2023-10-18" @default.
• W1991549612 title "Inhibition by Triptolide of IL-1–Induced Collagen Degradation by Corneal Fibroblasts" @default.
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• W1991549612 doi "https://doi.org/10.1167/iovs.03-0476" @default.
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