title: Highly sulphated glycosaminoglycans in articular cartilage and other tissues containing beta 2 microglobulin dialysis amyloid deposits.
abstract: BACKGROUND
  Highly sulphated glycosaminoglycans (GAGs) are a common constituent of amyloid deposits and an integral component of articular connective tissues where beta 2-microglobulin (beta 2M) amyloid is most often found.
  
  
  METHODS
  Using alcian blue, magnesium chloride, critical electrolyte concentration, mucin histochemistry, and immunohistochemistry, the GAGs composition of beta 2M amyloid deposits in joint capsule and cartilage, carpal, and heart tissues of 22 uraemic patients was determined.
  
  
  RESULTS
  Highly sulphated GAGs were found in beta 2M amyloid deposits not only within cartilage, where such GAGs are normally found in high concentration, but also in other articular and extra-articular connective tissues. Keratan sulphate was often specifically localized to beta 2M amyloid deposits in articular cartilage and to a lesser extent in periarticular tissues, with one case showing colocalization with systemic vascular amyloid deposition. Other sulphated GAGs, chondroitin 4 and 6 sulphate, dermatan sulphate, and heparan sulphate were also identified in tissues containing beta 2M amyloid deposits, but with the exception of heparan sulphate (identified by mucin histochemistry) were not specifically localized to the deposits themselves.
  
  
  CONCLUSIONS
  These findings suggest that qualitative or quantitative changes in the composition of highly sulphated GAGs may play a role in localization of beta 2M amyloid deposits in articular and extra-articular tissues.
authors.affiliation: Department of Pathology, Nuffield Orthopaedic Centre, Oxford, UK.
authors.forename: N A
authors.initials: NA
authors.lastname: Athanasou
authors.forename: B
authors.initials: B
authors.lastname: Puddle
authors.forename: B
authors.initials: B
authors.lastname: Sallie
mesh_terms: D000368:Aged; D000682:Amyloid / Q000378:metabolism*; D002358:Cartilage, Articular / Q000378:metabolism*; D005260:Female; D006025:Glycosaminoglycans / Q000378:metabolism*; D006651:Histocytochemistry; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009077:Mucins / Q000378:metabolism; D006435:Renal Dialysis / Q000009:adverse effects*; D014018:Tissue Distribution; D001613:beta 2-Microglobulin / Q000378:metabolism*
chemical_list: D000682:Amyloid; D006025:Glycosaminoglycans; D009077:Mucins; D001613:beta 2-Microglobulin; C013786:A73025