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Updated: Jun 23, 2025

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RGC-32 mediates proinflammatory and profibrotic pathways in immune-mediated kidney disease.

Alexandru Tatomir1, Sonia Vlaicu2, Vinh Nguyen3

  • 1Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA; Neurology Service, Veterans Administration Medical Health Care Center, Baltimore, MD, USA.

Clinical Immunology (Orlando, Fla.)
|June 15, 2024
PubMed
Summary

Response gene to complement-32 (RGC-32) deficiency protects against lupus nephritis in mice. RGC-32 inhibition may offer a new therapeutic strategy for immune complex-mediated glomerulonephritis.

Keywords:
AutoimmunityNephrotoxic nephritisResponse gene to complement-32

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Area of Science:

  • Immunology
  • Nephrology
  • Molecular Biology

Background:

  • Systemic lupus erythematosus (SLE) causes immune-mediated kidney damage.
  • Nephrotoxic nephritis (NTN) is an experimental model for lupus nephritis.
  • Response gene to complement-32 (RGC-32) is implicated in inflammation and fibrosis.

Purpose of the Study:

  • To investigate the role of RGC-32 in experimental lupus nephritis (NTN).
  • To determine if RGC-32 deficiency impacts disease progression and immune cell infiltration.
  • To evaluate RGC-32 as a potential therapeutic target for lupus nephritis.

Main Methods:

  • Utilized RGC-32 knockout (KO) mice in the NTN model.
  • Assessed proteinuria, renal function, and kidney histopathology.
  • Analyzed chemokine/receptor expression (CCL20/CCR6, CXCL9/CXCR3) and immune cell populations (IL-17+, IFNγ+).
  • Quantified extracellular matrix deposition (collagen I, III, fibronectin).

Main Results:

  • RGC-32 KO NTN mice showed reduced proteinuria, improved renal function, and attenuated kidney damage.
  • Deficiency in RGC-32 led to downregulation of CCL20/CCR6 and CXCL9/CXCR3.
  • Reduced infiltration of IL-17+ and IFNγ+ cells, and fewer innate immune cells were observed in RGC-32 KO kidneys.
  • Renal fibrosis was significantly decreased in RGC-32 deficient mice.

Conclusions:

  • RGC-32 plays a critical role in mediating inflammation and fibrosis in lupus nephritis.
  • RGC-32 is a shared mediator in Th17 and Th1 driven pathways.
  • Targeting RGC-32 presents a potential novel therapeutic approach for immune complex-mediated glomerulonephritis, including lupus nephritis.