Implication of the CD47 pathway in autoimmune diabetes.
CD47 and signal regulatory protein (SIRP) interactions have been proposed to take part in autoimmune disease susceptibility. Importantly, a recent genome-wide association study for type 1 diabetes susceptibility highlighted the association of the 20p13 region comprising the SIRP cluster, where some of the SIRP proteins encode functional ligands to CD47. Using a TCR transgenic mouse model at the brink of autoimmune disease, we demonstrate that CD47-deficiency is sufficient to break the immune tolerance and provoke the onset of autoimmune diabetes. Interestingly, CD47-deficient mice show a severe reduction in the number of mature CD4(-)CD8(-) T cells, and passive transfer of these CD4(-)CD8(-) T cells is sufficient to restore immune tolerance and prevent diabetes progression. Together, these findings constitute an in vivo demonstration that CD47 is involved in diabetes susceptibility and controls the homeostatic regulation of CD4(-)CD8(-) T cells.
Immunology-oncology Section, Maisonneuve-Rosemont Hospital, Montreal, Quebec, H1T 2M4 Canada.
Véronique
V
Dugas
Claudine
C
Beauchamp
Geneviève
G
Chabot-Roy
Erin E
EE
Hillhouse
Sylvie
S
Lesage
D000818:Animals; D015704:CD4 Antigens / Q000096:biosynthesis; D051928:CD47 Antigen / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D016827:CD8 Antigens / Q000096:biosynthesis; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics / Q000276:immunology* / Q000473:pathology / Q000503:physiopathology; D018450:Disease Progression; D004198:Disease Susceptibility; D007108:Immune Tolerance / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D016688:Mice, Inbred NOD; D018345:Mice, Knockout; D008822:Mice, Transgenic; D011485:Protein Binding / Q000235:genetics / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D011971:Receptors, Immunologic / Q000276:immunology / Q000378:metabolism*; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology / Q000378:metabolism* / Q000473:pathology
D015704:CD4 Antigens; D051928:CD47 Antigen; D016827:CD8 Antigens; C501922:Sirpa protein, mouse; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic