当前位置： SCI文献检索 > CLINICAL AND EXPERIMENTAL RHEUMATOLOGY期刊下所有文献 > Diacerein reduces the level of cartilage chondrocyte DNA fragmentation and death in experimental dog osteoarthritic cartilage at the same time that it inhibits caspase-3 and inducible nitric oxide synthase.

Diacerein reduces the level of cartilage chondrocyte DNA fragmentation and death in experimental dog osteoarthritic cartilage at the same time that it inhibits caspase-3 and inducible nitric oxide synthase.

Abstract：

OBJECTIVE:The primary objective of this study was to evaluate the ex vivo therapeutic efficacy of diacerein and its active metabolite, rhein, on osteoarthritic (OA) cartilage chondrocyte DNA fragmentation and death in the experimental canine model of OA. The study also aimed to explore the effect of the drug on the level of important factors involved in this phenomenon, i.e., caspase-3 and inducible nitric oxide synthase (iNOS). METHODS:OA knee cartilage was obtained from dogs that had received surgical sectioning of the anterior cruciate ligament (ACL) and were sacrificed 12 weeks after surgery. Cartilage explants were cultured in the presence or absence of therapeutic concentrations of diacerein (20 micrograms/ml) or rhein (20 micrograms/ml). Cartilage specimens were stained for TUNEL reaction and immunostained using specific antibodies for active caspase-3 and iNOS. Morphometric analyses were also performed. RESULTS:In OA cartilage specimens, a large number of chondrocytes in the superficial layers stained positive for TUNEL reaction. Treatment with therapeutic concentrations of diacerein (20 micrograms/ml) or rhein (20 micrograms/ml) significantly reduced the level of chondrocyte DNA fragmentation to about the same extent in both treatment groups (P < 0.006, P < 0.002, respectively). The levels of caspase-3 and iNOS in cartilage explants were also significantly decreased (caspase-3, diacerein P < 0.04; caspase-3, rhein P < 0.0003; and iNOS, rhein P < 0.009, respectively) when compared to the control group. CONCLUSIONS:This study shows that diacerein/rhein can effectively reduce the level of OA chondrocyte DNA fragmentation and death under the present experimental conditions. This effect is mediated by a decrease in the level of caspase-3 expression, which could possibly be related in part to the reduced level of iNOS and secondarily to NO production. These findings provide additional new information about the mechanisms of action of diacerein on the progression of OA.

journal_name

Clin Exp Rheumatol

journal_title

Clinical and experimental rheumatology

authors

Pelletier JP,Mineau F,Boileau C,Martel-Pelletier J

keywords:

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

171-7

issue

eissn

0392-856X

issn

1593-098X

journal_volume

pub_type

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Diacerein reduces the level of cartilage chondrocyte DNA fragmentation and death in experimental dog osteoarthritic cartilage at the same time that it inhibits caspase-3 and inducible nitric oxide synthase.