Differential role of programmed death-ligand 1 [corrected] and programmed death-ligand 2 [corrected] in regulating the susceptibility and chronic progression of experimental autoimmune encephalomyelitis.
Programmed death-1 (PD-1) is a negative costimulatory molecule, and blocking the interaction of PD-1 with its ligands, PD-L1 (B7-H1) and PD-L2 (B7-DC), enhances autoimmune disease in several animal models. We have studied the role of PD-1 ligands in disease susceptibility and chronic progression in experimental autoimmune encephalomyelitis (EAE). In BALB/c mice immunized with myelin oligodendrocyte glycoprotein (MOG) peptide 35-55, PD-L1 but not PD-L2 blockade significantly increased EAE incidence. In B10.S mice immunized with myelin proteolipid protein (PLP) peptide 139-151, both PD-L1 and PD-L2 blockade markedly enhanced EAE severity. In prediabetic NOD mice immunized with PLP48-70, PD-L2 blockade worsened EAE but did not induce diabetes, whereas PD-L1 blockade precipitated diabetes but did not worsen EAE, suggesting different regulatory roles of these two ligands in EAE and diabetes. B6 mice immunized with MOG35-55 developed chronic persistent EAE, and PD-L2 blockade in the chronic phase exacerbated EAE, whereas PD-L1 blockade did not. In contrast, SJL/J mice immunized with PLP139-151 developed chronic relapsing-remitting EAE, and only PD-L1 blockade during remission precipitated EAE relapse. The strain-specific effects of PD-1 ligand blockade did not correlate with the expression of PD-L1 and PD-L2 on dendritic cells and macrophages in lymphoid tissue, or on inflammatory cells in the CNS. However, EAE enhancement is correlated with less prominent Th2 cytokine induction after specific PD-1 ligand blockade. In conclusion, PD-L1 and PD-L2 differentially regulate the susceptibility and chronic progression of EAE in a strain-specific manner.
Zhu
Bing
B
Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
Guleria
Indira
I
Khosroshahi
Arezou
A
Chitnis
Tanuja
T
Imitola
Jaime
J
Azuma
Miyuki
M
Yagita
Hideo
H
Sayegh
Mohamed H
MH
Khoury
Samia J
SJ
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000378:metabolism; D018122:B7-1 Antigen / Q000276:immunology / Q000378:metabolism*; D060890:B7-H1 Antigen; D002478:Cells, Cultured; D002908:Chronic Disease; D016207:Cytokines / Q000378:metabolism; D018450:Disease Progression; D004198:Disease Susceptibility; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology / Q000378:metabolism* / Q000473:pathology*; D005260:Female; D008562:Membrane Glycoproteins / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D010455:Peptides / Q000276:immunology / Q000378:metabolism*; D061027:Programmed Cell Death 1 Ligand 2 Protein; D012008:Recurrence; D018418:Th2 Cells / Q000378:metabolism; D015854:Up-Regulation
D018122:B7-1 Antigen; D060890:B7-H1 Antigen; C498919:Cd274 protein, mouse; D016207:Cytokines; D008562:Membrane Glycoproteins; C556978:Pdcd1lg2 protein, mouse; D010455:Peptides; D061027:Programmed Cell Death 1 Ligand 2 Protein