Neutralizing the IL-7Rα limits injury in experimental ANCA-associated glomerulonephritis

Area of Science:

• Immunology
• Nephrology
• Autoimmunity

Background:

• Increased T cell IL-7Rα (CD127) signaling correlates with poor prognosis in ANCA-associated vasculitis.
• The role of IL-7Rα in T cell-mediated experimental glomerulonephritis was investigated.

Purpose of the Study:

• To examine the functional role of IL-7Rα (CD127) in experimental anti-myeloperoxidase (MPO) glomerulonephritis.
• To test the hypothesis that blocking IL-7Rα function would be protective without causing T cell depletion.

Main Methods:

• Mice were immunized with MPO and induced to develop glomerulonephritis using anti-basement membrane globulin.
• Intrarenal T cells expressing IL-7Rα were characterized using flow cytometry and RNA-sequencing.
• Anti-IL-7Rα antibodies were administered to mice with established anti-MPO autoimmunity.

Main Results:

• Mice with anti-MPO glomerulonephritis showed increased intrarenal IL-7Rα+ CD4+ and CD8+ T cells.
• Gene expression analysis revealed T cell exhaustion signatures in IL-7Rα+ T cells.
• Blocking IL-7Rα reduced histological injury, albuminuria, leukocyte infiltration, and pro-inflammatory cytokine expression.

Conclusions:

• Intrarenal effector memory and exhausted T cells express IL-7Rα in experimental anti-MPO glomerulonephritis.
• Neutralizing T cells via IL-7Rα after autoimmunity induction limits kidney inflammation and disease.
• IL-7Rα represents a potential therapeutic target for ANCA-associated vasculitis.