Document Detail

Interstitial matrix proteins determine hyaluronan reflection and fluid retention in rabbit joints: effect of protease.
MedLine Citation:
PMID:  17008373     Owner:  NLM     Status:  MEDLINE    
Hyaluronan (HA) retention inside the synovial cavity of joints serves diverse protective roles. We tested the hypothesis that HA retention is mediated by the network of extracellular matrix proteins in the synovial lining. Cannulated rabbit knee joints were infused with HA solution with or without pretreatment by chymopapain, a collagen-sparing protease. Trans-synovial fluid escape rate was measured and, after a period of trans-synovial filtration, samples of intra-articular fluid and subsynovial fluid were analysed for HA to assess its trans-synovial ultrafiltration. In control joints, HA ultrafiltration was confirmed by postfiltration increases in intra-articular HA concentration (259 +/- 17% of infused concentration) and reduced subsynovial concentration (30 +/- 8%; n = 11). The proportion of HA molecules reflected by the synovium was 57-75%. Chymopapain treatment increased the hydraulic permeability of the synovial lining approximately 13-fold, almost abolished the trans-synovial difference in HA concentration and reduced the HA reflected fraction to 3-7% (n = 6; P < 0.001, ANOVA). Structural studies confirmed that chymopapain treatment depleted the matrix of proteoglycans but preserved its collagen. The findings thus demonstrate that HA ultrafiltration and synovial hydraulic permeability are determined by the network of non-collagen, extracellular matrix proteins. This may be important clinically, since protease activity is raised in rheumatoid arthritis, as are HA and fluid escape.
S Sabaratnam; P J Coleman; R M Mason; J R Levick
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-09-28
Journal Detail:
Title:  The Journal of physiology     Volume:  578     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-01-01     Completed Date:  2007-02-26     Revised Date:  2013-06-07    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  291-9     Citation Subset:  IM    
Physiology, Basic Medical Sciences, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK.
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MeSH Terms
Chymopapain / administration & dosage,  pharmacology*
Extracellular Matrix Proteins / metabolism*
Fluorescent Dyes
Hyaluronic Acid / metabolism*
Injections, Intra-Arterial
Joints / drug effects,  metabolism*,  ultrastructure
Lymph / metabolism
Synovial Fluid / drug effects,  metabolism*
Synovial Membrane / drug effects,  ultrastructure
Grant Support
056983/Z/99//Wellcome Trust
Reg. No./Substance:
0/Extracellular Matrix Proteins; 0/Fluoresceins; 0/Fluorescent Dyes; 0/fluorescein-dextran; 9004-54-0/Dextrans; 9004-61-9/Hyaluronic Acid; EC

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