期刊
JOURNAL OF ORTHOPAEDIC RESEARCH
卷 18, 期 3, 页码 364-373出版社
JOURNAL BONE JOINT SURGERY INC
DOI: 10.1002/jor.1100180307
关键词
-
类别
资金
- NIAMS NIH HHS [5T32-AR07590-02, 2P50-AR39239] Funding Source: Medline
The purpose of this study was to investigate collagen receptors on primary bovine articular chondrocytes from full-thickness and different layers of bovine articular cartilage. Cytometric studies with antibodies showed that approximately 56% of the chondrocytes from the superficial layer and 29% of the chondrocytes from the deep layer bound anti-annexin V. A similar tendency was found for alpha 5 and beta 1 integrin antibodies. Flow cytometric analysis initially detected annexin V on chondrocytes following isolation; the level of detection subsequently decreased by 24 hours, whereas that of alpha 5 and beta 1 integrins increased. Treatment of chondrocytes with collagenase at 24 hours restored the initially high epitope recognition of annexin V, indicating masking of annexin V by newly formed collagen matrix. There was little effect on detection levels for beta 1 integrin. Contrary to the specific matrix receptor expression, chondrocytes from superficial and deep layers differed little in attachment to immobilized types I and II collagens. However, the attachment was more effectively inhibited with anti-annexin V than with integrin antibodies. Competition studies with preparations of soluble collagens revealed a preferential binding of bovine type-II collagen compared with bovine type-I collagen. Anti-annexin V antibodies inhibited binding of type-II collagen more effectively than anti-alpha 5 or anti-beta 1 integrin antibodies. Evidently, under the in vitro conditions of this study, annexin V is the quantitatively predominant type-II collagen receptor on bovine articular chondrocytes. This opens a discussion of the possibly dualistic metabolic/mechanical annexin V-integrin receptor elements.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据