The involvement of NK cells in ankylosing spondylitis.
A role for NK cells in the regulation of autoimmunity has been demonstrated. Since there is a strong association between Ankylosing Spondylitis (AS) and HLA-B27, which is specifically recognized by the NK-inhibitory receptor KIR3DL1, this study evaluated the potential involvement of NK cells in AS. We studied 19 AS patients and 22 healthy volunteer donors and assessed the percentage, activity and receptor expression of peripheral blood NK cells. We also evaluated candidate-inflammatory mediators in sera. We found that AS patients have significantly higher percentages of NK cells. However, we found no differences between the ability of NK cells derived from AS and healthy controls to recognize target cells expressing HLA-B27. Remarkably, we observed that the NK-inhibitory receptor CEACAM1 (carcino-embryonic antigen-cell adhesion molecule) is highly expressed among AS-derived NK cells. Furthermore, engagement of CEACAM1 inhibited NK activity in these patients. Finally, we demonstrated that CEACAM1 expression is induced by IL-8 and SDF-1 (stromal cell derived factor), both of which are present in high levels in the sera of AS patients. These results may indicate that NK cells and CEACAM1 play a role in AS pathogenesis and implicate chemokines in the mechanism of CEACAM1 expression.
Azuz-Lieberman
Niva
N
The Lautenberg Center for General and Tumor Immunology, The Hebrew University, Hadassah Medical School, Jerusalem, 91120, Israel.
Markel
Gal
G
Mizrahi
Sa'ar
S
Gazit
Roi
R
Hanna
Jacob
J
Achdout
Hagit
H
Gruda
Raizy
R
Katz
Gil
G
Arnon
Tal I
TI
Battat
Shosh
S
Zamir
Ehud
E
Adawi
Muhammed
M
Mader
Reuven
R
Mandelboim
Ofer
O
D000328:Adult; D015703:Antigens, CD / Q000276:immunology; D015551:Autoimmunity / Q000276:immunology*; D015815:Cell Adhesion Molecules / Q000276:immunology; D002478:Cells, Cultured; D005786:Gene Expression Regulation / Q000276:immunology; D015796:HLA-B27 Antigen / Q000276:immunology*; D006801:Humans; D016209:Interleukin-8 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011971:Receptors, Immunologic / Q000276:immunology*; D054340:Receptors, KIR; D054341:Receptors, KIR3DL1; D013167:Spondylitis, Ankylosing / Q000276:immunology* / Q000473:pathology
D015703:Antigens, CD; C069847:CD66 antigens; D015815:Cell Adhesion Molecules; D015796:HLA-B27 Antigen; D016209:Interleukin-8; C515083:KIR3DL1 protein, human; D011971:Receptors, Immunologic; D054340:Receptors, KIR; D054341:Receptors, KIR3DL1