Development of murine lupus involves the combined genetic contribution of the SLAM and FcgammaR intervals within the Nba2 autoimmune susceptibility locus.
Autoantibodies are of central importance in the pathogenesis of Ab-mediated autoimmune disorders. The murine lupus susceptibility locus Nba2 on chromosome 1 and the syntenic human locus are associated with a loss of immune tolerance that leads to antinuclear Ab production. To identify gene intervals within Nba2 that control the development of autoantibody-producing B cells and to determine the cellular components through which Nba2 genes accomplish this, we generated congenic mice expressing various Nba2 intervals where genes for the FcgammaR, SLAM, and IFN-inducible families are encoded. Analysis of congenic strains demonstrated that the FcgammaR and SLAM intervals independently controlled the severity of autoantibody production and renal disease, yet are both required for lupus susceptibility. Deregulated homeostasis of terminally differentiated B cells was found to be controlled by the FcgammaR interval where FcgammaRIIb-mediated apoptosis of germinal center B cells and plasma cells was impaired. Increased numbers of activated plasmacytoid dendritic cells that were distinctly CD19+ and promoted plasma cell differentiation via the proinflammatory cytokines IL-10 and IFNalpha were linked to the SLAM interval. These findings suggest that SLAM and FcgammaR intervals act cooperatively to influence the clinical course of disease through supporting the differentiation and survival of autoantibody-producing cells.
Jørgensen
Trine N
TN
Division of Allergy and Clinical Immunology, University of Colorado Health Sciences Center, Denver, CO 80262, USA.
Alfaro
Jennifer
J
Enriquez
Hilda L
HL
Jiang
Chao
C
Loo
William M
WM
Atencio
Stephanie
S
Bupp
Melanie R Gubbels
MR
Mailloux
Christina M
CM
Metzger
Troy
T
Flannery
Shannon
S
Rozzo
Stephen J
SJ
Kotzin
Brian L
BL
Rosemblatt
Mario
M
Bono
María Rosa
MR
Erickson
Loren D
LD
D000818:Animals; D015703:Antigens, CD / Q000235:genetics*; D017209:Apoptosis; D001323:Autoantibodies / Q000096:biosynthesis; D001402:B-Lymphocytes / Q000473:pathology; D002454:Cell Differentiation; D016207:Cytokines / Q000502:physiology; D018450:Disease Progression; D020022:Genetic Predisposition to Disease / Q000235:genetics; D007674:Kidney Diseases; D008180:Lupus Erythematosus, Systemic / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D051379:Mice; D020297:Mice, Congenic; D010950:Plasma Cells / Q000473:pathology; D011956:Receptors, Cell Surface / Q000235:genetics*; D017452:Receptors, IgG / Q000235:genetics*; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1
D015703:Antigens, CD; D001323:Autoantibodies; D016207:Cytokines; D011956:Receptors, Cell Surface; D017452:Receptors, IgG; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1