File
Authors
Keywords
guinea pig
insulin-like growth factor 1
osteoarthritis
osteophyte formation
Abstract
In this study, we investigated osteophyte formation processes in guinea pigs with spontaneous osteoarthritis, histochemically and immunohistochemically. Serial thin frontal sections of right knee joints were prepared from Hartley guinea pigs aged 1, 3, 5, 8, 12 and 18 months. The severity of osteoarthritis was evaluated by safranin-O staining, and the animals were classified into 3 groups: mild, moderate and severe. In addition, immunostaining was performed by using primary antibodies against the proliferating cell nuclear antigen (PCNA), type-I, -II and -III collagens, insulin-like growth factor 1 (IGF-1) and IGF-1 receptor. In the mild group, there was fibrous connective tissue continuous with the synovial membrane and covering the margins of the articular cartilage of the medial tibial condyle. This tissue contained spindle-shaped fibroblastic-like cells. These cells were positive for PCNA, type-I and -III collagens, IGF-1 and IGF-1 receptor. In the moderate group, the chondrocytes beneath the fibroblastic-like cell layer had proliferated and were clustered together. These chondrocytes were also positive for PCNA, type-I and -III collagens, IGF-1 and IGF-1 receptor. In the severe group, this marginal area had been replaced by type-II collagen-positive chondrophytes, which further changed to osteophytes due to the process of endochondral ossification. In guinea pigs, fibroblastic-like cells at the margins of the articular cartilage of the knee joints seemed to be totipotent immature mesenchymal cells. These cells may be the precursors of osteophytes, and IGF-1 appears to be involved in their formation.
Publisher
Tottori University Faculty of Medicine
Content Type
Journal Article
ISSN・ISBN
1346-8049
NCID
AA00892882
Journal Title
Yonago Acta medica
Current Journal Title
Yonago Acta medica
Volume
43
Issue
3
Start Page
131
End Page
140
Published Date
2000-11
Text Version
Publisher
Rights
Yonago Acta medica 編集委員会
Citation
Yonago Acta medica. 2000, 43(3), 131-140
Department
Faculty of Medicine/Graduate School of Medical Sciences/University Hospital
Language
English