Linked Life Data

9041497

Source:http://linkedlifedata.com/resource/pubmed/id/9041497

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1997-5-28
pubmed:abstractText
An established model of experimental disc degeneration (Osti et al., Spine 15:762, 1990; Melrose et al., J Orthop Res 10:655, 1992) was used in this study. Four 2-year-old sheep received anterolateral incisions (4 x 10 mm) in the outer one-third of the annulus fibrosus of their L2-L3 and L4-L5 discs (lesion group). The annulus was not incised in another four sham-operated animals. After 6 months the sheep were killed, lumbar discs were dissected into lateral halves of the annulus fibrosus and the nucleus pulposus. Cells were isolated from disc tissues enzymatically and were grown in alginate bead culture to examine the proteoglycan metabolism of cells from lesion and control zones. The media of lesion zone cultures contained relatively high levels (compared with sham cultures) of catabolic fragments of the large, high-buoyant-density proteoglycans as demonstrated by Western blotting using monoclonal antibodies (5-D-4, 3-B-3, 1-C-6) and biotinylated hyaluronan and also by gel chromatography. Furthermore, cells from the vicinity of the lesion site also synthesized significantly lower levels (compared with sham cultures) of aggrecan that was retained within the alginate beads. Collectively, these data indicated that focal depletion of large, high-buoyant-density proteoglycans was evident within lesion sites in this model of experimental disc degeneration. The introduction of an annular lesion therefore significantly affected the proteoglycan metabolism of endogenous disc cell populations. The unique hydrodynamic and viscoelastic properties of the intervertebral disc are dependent to a large degree on the tissue levels of aggrecan. The focal depletion of aggrecan by annular lesions therefore may represent an important predisposing factor to the subsequent degeneration of these intervertebral discs.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0895-0385
pubmed:author
pubmed:issnType
Print
pubmed:volume
10
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
55-67
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:9041497-Aggrecans, pubmed-meshheading:9041497-Alginates, pubmed-meshheading:9041497-Animals, pubmed-meshheading:9041497-Blotting, Western, pubmed-meshheading:9041497-Cells, Cultured, pubmed-meshheading:9041497-Chondroitin Sulfate Proteoglycans, pubmed-meshheading:9041497-Chromatography, Gel, pubmed-meshheading:9041497-Culture Media, pubmed-meshheading:9041497-Extracellular Matrix Proteins, pubmed-meshheading:9041497-Female, pubmed-meshheading:9041497-Glucuronic Acid, pubmed-meshheading:9041497-Hexuronic Acids, pubmed-meshheading:9041497-Intervertebral Disc, pubmed-meshheading:9041497-Lectins, C-Type, pubmed-meshheading:9041497-Microspheres, pubmed-meshheading:9041497-Peptide Fragments, pubmed-meshheading:9041497-Proteoglycans, pubmed-meshheading:9041497-Sheep, pubmed-meshheading:9041497-Spinal Diseases
pubmed:year
1997
pubmed:articleTitle
Topographical variation in the catabolism of aggrecan in an ovine annular lesion model of experimental disc degeneration.
pubmed:affiliation
Raymond Purves Bone and Joint Research Laboratories, University of Sydney, Royal North Shore Hospital of Sydney, St. Leonards, New South Wales, Australia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't