Comparison of matrix vesicles derived from normal and osteoarthritic human articular cartilage. Connect Tissue Res 1996;35(1-4):337-42
Date
01/01/1996Pubmed ID
9084673DOI
10.3109/03008209609029209Scopus ID
2-s2.0-0030430793 (requires institutional sign-in at Scopus site) 44 CitationsAbstract
Articular cartilage matrix vesicles (MVs) from normal human adult articular cartilage were examined for protein and enzyme content and biomineralizing capacity for comparison to MVs derived from human osteoarthritic (OA) cartilage. Femoral condylar and tibial plateau cartilage from each of 9 healthy donors ages 17-37 y was enzymatically digested and serially ultracentrifuged to pellet MV's at 3 x 10(6) g-min. MV protein content, nucleoside triphosphate pyrophospho hydrolase (NTPPPH) specific activity (SA) and capacity for 45Ca precipitation were determined. MV precipitated mineral was examined using Fourier transform infrared spectroscopy (FTIR). Normal human cartilage yields 50% less MV protein/g cartilage than OA cartilage (p < .01). Normal human articular MVs possess 30-70x higher NTPPPH SA than cell-free digest. Mean NTPPPH SAs of MVs derived from normal human cartilage are 3x higher than that of OA MVs (p < .05) and normal MV NTPPPH SA appears to decrease with age (p < .01). Normal human MVs support significantly higher calcium precipitation/mg MV protein in both ATP-dependent (p < .01) and -independent (p = .05) systems. The FTIR spectrum of MV mineral generated in the presence of ATP strongly resembles the standard spectrum for calcium pyrophosphate dihydrate (CPPD). The FTIR spectrum of MV mineral generated without ATP resembles that of carbonate-substituted apatite (AP). The fact that isolated MVs from normal cartilage generate pathologically relevant crystal phases in vitro implies that matrix integrity and substrate availability may be crucial factors in the control of pathologic biomineralization.
Author List
Derfus BA, Kurtin SM, Camacho NP, Kurup I, Ryan LMMESH terms used to index this publication - Major topics in bold
AdolescentAdult
Aged
Calcinosis
Calcium
Cartilage, Articular
Humans
Osteoarthritis
Pyrophosphatases
Spectroscopy, Fourier Transform Infrared