Zusammenfassung
Hintergrund
Die Inzidenz degenerativer Veränderungen und Osteoarthritis ist im Sprunggelenk geringer als im Kniegelenk. Dies kann nicht ausschließlich mit Unterschieden in der Anatomie und den biomechanischen Eigenschaften dieser beiden Gelenke erklärt werden. Frühere Untersuchungen zeigten Unterschiede in der biochemischen Zusammensetzung der extrazellulären Matrix des Gelenkknorpels von Knie- und Sprunggelenk. Das Ziel der vorliegenden Studie war die Identifikation möglicher metabolischer Unterschiede von Knie- und Sprunggelenkchondrozyten an isolierten Zellen, um die sekundären Effekte der vorhandenen extrazellulären Matrix von der primären matrixunabhängigen zellulären Differenzierung zu unterscheiden.
Methoden
Isolierte Chondrozyten des Knie- und Sprunggelenks humaner Spender wurden in Alginatkügelchen kultiviert und mit dem katabolen Zytokin Interleukin-1 (IL-1) als Modell einer entzündlichen Episode inkubiert. Der Proteoglykan- (PG-)Stoffwechsel wurde über die 35S-Inkorporation in Glykosaminoglykane (GAG) analysiert.
Ergebnisse
Die Gegenwart von IL-1 induzierte eine Inhibition der PG-Synthese des Knie- und Sprunggelenkknorpels. Dabei war die 50%-Hemmkonzentration (IC50) von IL-1 für das Kniegelenk ca. 5fach geringer als für das Sprunggelenk.
Schlussfolgerung
Sprunggelenkchondrozyten besitzen eine höhere IL-1-Resistenz als Kniegelenkchondrozyten.
Abstract
Background
The incidence of degenerative changes and osteoarthritis is lower in the ankle than in the knee joints. This cannot be explained exclusively with differences in anatomy and biomechanical properties of these two synovial joints. Previous studies have indicated distinct differences in the biochemical composition of the extracellular matrix of articular cartilage from knee and ankle joints. The aim of this study was to identify potential metabolic differences between knee and ankle joint chondrocytes using isolated cells to distinguish the secondary effects of the resident extracellular matrix from the primary matrix-independent effects of cellular differentiation.
Method
Isolated knee and ankle chondrocytes from the same human donor were cultured in alginate beads and subsequently exposed to a three-day pulse of the catabolic cytokine interleukin-1 (IL-1) as a model of an inflammatory episode. The metabolism of proteoglycans (PG’s) was analyzed as expressed changes in 35S-sulfate incorporation into glycosaminoglycans (GAG’s).
Results
The presence of IL-1 induced an inhibition of PG synthesis in knee and ankle articular chondrocytes. The 50% inhibitory concentration (IC50) of IL-1 was about 5 times lower for knee than for ankle chondrocytes.
Conclusion
Ankle chondrocytes are more resistant to IL-1 induced inhibition of PG synthesis than chondrocytes from the knee.
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Institution, an der die Untersuchung durchgeführt wurde: Department of Biochemistry, Rush Medical College at Rush University Medical Center, 1653 West Congress Parkway, Chicago, IL 60612, USA.
Finanzielle Unterstützung: Diese Arbeit wurde teilweise unterstützt durch Forschungsgelder des NIH (grants AR 39239, M.A., J.M., K.K., A.C.), einem Stipendium der „Max Kade Foundation“ (444USA-031/15/99, M.A.),der Deutschen Forschungsgemeinschaft (AU156/6-1, M.A.; MO980/1, JM), sowie einem Stipendium der Dr. Scholl Foundation (A.C.).
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Aurich, M., Eger, W., Rolauffs, B. et al. Sprunggelenkchondrozyten besitzen eine höhere Interleukin-1-Resistenz als Kniegelenkchondrozyten. Orthopäde 35, 784–790 (2006). https://doi.org/10.1007/s00132-006-0958-2
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DOI: https://doi.org/10.1007/s00132-006-0958-2