Linked Life Data

12038627

Source:http://linkedlifedata.com/resource/pubmed/id/12038627

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2002-5-31
pubmed:abstractText
The prevalence of osteoarthritis (OA) is lower in some joints, i.e., the ankle, than in the knee. We have compared the cartilages from these two joints of the same limb in adult donors (matched pairs). Our data to date suggest that there are metabolic, biochemical and biomechanical differences between the cartilages of the two joints. The current study has focused on extending the metabolic studies comparing the response of chondrocytes to Interleukin-1beta (IL-1beta) and osteogenic protein 1 (OP-1) by analyzing changes in sulfate incorporation into glycosaminoglycans (GAGs) as a measure of proteoglycan (PG) synthesis. Human adult chondrocytes from normal knees (tibiofemoral) and ankles (talocrural) joints cultured as explants both responded to IL-1beta after 72 h by decreasing PG synthesis; however, the IC50 for the knee chondrocytes was 6.2 pg/ml, while that for the ankle was 35 pg/ml. When the explants were incubated for 72 h with IL-1beta and allowed to rebound without IL-1beta, synthesis of PG was significantly elevated by ankle chondrocytes within five days; knee chondrocytes were unable to significantly increase synthesis even after eight days. However, in both knee and ankle, application of OP-I enhanced PG synthesis in the rebound phase. In response to IL-1, an upregulation of proteinase activity was detectable by an increase in the neoepitopes proteolytically-generated by both aggrecanase and matrix metalloproteinases (MMPs), in the deep zone of the knee cartilage. Stromelysin and collagenase were upregulated as well. The data emerging from these studies confirm that the ankle is less responsive to catabolic stimulation and more responsive to anabolic stimulation following IL-1 removal. These differences in metabolic activity between the cartilages of the two joints could in part help to explain their differences in susceptibility to OA.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0736-0266
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
526-34
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Human knee and ankle cartilage explants: catabolic differences.
pubmed:affiliation
Department of Orthopaedic Surgery, Wichernhaus at Rummelsberg Hospital, Schwarzenbruck/Nürnberg, Germany.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't