Programmed death 1 and its ligands do not limit experimental foreign antigen-induced immune complex...

Area of Science:

• Immunology
• Nephrology
• Molecular Biology

Background:

• Programmed death 1 (PD-1) and its ligands (PD-L1, PD-L2) regulate T-cell responses and immune tolerance.
• Glomerulonephritis can arise from various immune responses to self or foreign antigens.
• The role of the PD-1 pathway in foreign antigen-induced glomerulonephritis requires further elucidation.

Purpose of the Study:

• To investigate the role of the PD-1/PD-L pathway in experimental circulating immune complex glomerulonephritis induced by a foreign antigen.
• To determine if inhibiting PD-1 or its ligands affects the development or severity of renal injury.

Main Methods:

• Immune complex glomerulonephritis was induced in BALB/c mice using horse spleen apoferritin.
• Mice received inhibitory antibodies against PD-1, PD-L1, or PD-L2.
• Renal pathology, immune cell responses, and autoantibody production were assessed.

Main Results:

• Inhibition of PD-1 did not exacerbate renal injury or increase immunoglobulin G deposition in glomeruli.
• Blocking PD-1 enhanced splenocyte proliferation and production of interferon-γ, IL-4, and IL-17, but not IL-10.
• Neutralization of PD-L1 or PD-L2 alone did not significantly alter renal injury.

Conclusions:

• The endogenous PD-1/PD-L pathway does not appear to limit acute experimental foreign antigen-induced circulating immune complex glomerulonephritis.
• PD-1 signaling may not be a critical protective mechanism in this specific model of glomerulonephritis.