RT Journal Article SR Electronic T1 Altered phospholipids in human rheumatoid synoviocytes. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 24 OP 29 DO 10.1136/ard.37.1.24 VO 37 IS 1 A1 Henderson, B A1 Bitensky, L A1 Chayen, J YR 1978 UL http://ard.bmj.com/content/37/1/24.abstract AB A specific cytochemical reaction for freely available phospholipids has shown a raised concentration of such phospholipids in the lining cells of human synovial membranes removed from rheumatoid joints. Quantitative measurement, by microdensitometry, of the amount of reaction-product per cell showed that the rheumatoid synoviocytes contained almost three times the amount of free phospholipids present in the equivalent nonrheumatoid cells; statistically the difference was highly significant. Evidence from studies in which the bound phospholipids were 'unmasked' by methanol-chloroform confirmed the view that the increased content of freely available phospholipids was related to altered lipid-protein binding rather than to an increase in total phospholipids.