지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2008.9
- 수록면
- 179 - 186 (8page)
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Matrix metalloproteinases (MMPs), also designated matrixins, hydrolyze components of the extracellular matrix. These proteinases play a central role in many biological processes, such as embryogenesis, normal tissue remodeling, wound healing, and angiogenesis, and in diseases such as atheroma, arthritis, cancer, and tissue ulceration. In previous data, disruption of the actin cytoskeleton by cytochalasin D (CD) inhibited NO-induced apoptosis, dedifferentiation, cyclooxygenase (COX)-2 expression, and prostaglandin E2 production in chondrocytes cultured on plastic or during cartilage explants culture. In this study, we investigated the effects of the actin cytoskeleton architecture on MMP-2 expression and dedifferentiation by CD in rabbit articular chondrocytes. Rabbit articular chondrocytes were prepared from cartilage slices of 2-weeks-old New Zealand white rabbits by enzymatic digestion. CD was used as a disruptor of actin cytoskeleton. In this experiments measuring CD dose response, primary chondrocytes were treated with various concentrations of CD for 24 h. The actin disruption was determined by immunostaining. MMP-2 expression levels were determined by immunoblot analysis and Reverse transcriptase-Polymerase chain reaction (RT-PCR) and MMP-2 activity was determined by gelatin zymography. We found that cell morphological change and up-regulation of MMP-2 expression by CD as determined via immunostaining, gelatin zymography and immunoblotting. Moreover, CD induced MMP-2 transcription was detected by RT-PCR. Also, CD-induced type Ⅱ collagen expression was inhibited by MMP-2 inhibitor I treatment. Our results indicate that CD up-regulated MMP-2 activation causes dedifferentiation of articular chondrocyte.
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