title: Expression of CD5 and CD72 on T and B cell subsets in rheumatoid arthritis and Sjögren's syndrome.
abstract: A minority of B cells express the CD5 marker, which is found on virtually all T cells, and CD72 has been defined as the CD5 ligand on the B cell membrane. The mean fluorescence intensity (MFI) of the CD5 molecules was shown to be higher on CD4+CD29+ than CD4+CD45RA+ in peripheral blood (PB) and synovial fluid (SF) of rheumatoid arthritis (RA) patients (P < 0.0001 and < 0.001), and PB of Sjögren's syndrome (SS) patients and normal controls (P < 0.02 and < 0.03). This MFI declined once the CD4 expressed HLA-DR in PB of SS patients (P < 0.004) and normal controls (P < 0.02) or CD25 in PB of RA (P < 0.004) and SS patients (P < 0.0004). There was a correlation between the CD5 MFI on CD4+CD45RA+ and CD4+CD29+ in RA (P < 0.001) as well as SS (P < 0.0007) PB. The CD72 MFI was impressively higher on CD5+ than CD5- B cells in PB and SF of RA patients (P < 0.0001 and P < 0.005) and PB of SS patients (P < 0.005) and normal controls (P < 0.005). Our data suggest that, in association with CD4CD29, CD5 is involved in CD5+B/CD5+ B cell interactions in non-organ-specific autoimmune diseases.
authors.affiliation: Laboratory of Immunology, Brest University Medical School Hospital, France.
authors.forename: C
authors.initials: C
authors.lastname: Jamin
authors.forename: A
authors.initials: A
authors.lastname: Lamour
authors.forename: Y L
authors.initials: YL
authors.lastname: Pennec
authors.forename: M
authors.initials: M
authors.lastname: Hirn
authors.forename: P
authors.initials: P
authors.lastname: Le Goff
authors.forename: P
authors.initials: P
authors.lastname: Youinou
mesh_terms: D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000378:metabolism*; D000944:Antigens, Differentiation, B-Lymphocyte / Q000378:metabolism*; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D016175:B-Lymphocyte Subsets / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018956:CD5 Antigens; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D016130:Immunophenotyping; D008211:Lymphocyte Cooperation; D008297:Male; D008875:Middle Aged; D012859:Sjogren's Syndrome / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D018956:CD5 Antigens; C064228:CD72 protein, human