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Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway
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Autoantibody-triggered podocyte membrane budding drives autoimmune kidney disease

Karen Lahme1, Wiebke Sachs1, Sarah Froembling1

  • 1Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; Hamburg Center for Kidney Health, UKE, 20246 Hamburg, Germany.

Cell
|December 5, 2025
PubMed

Insights

Researchers discovered autoimmunoglobulin-triggered extracellular vesicles (AIT-EVs) in urine, which are released by damaged kidney podocytes in membranous nephropathy. These AIT-EVs may offer a new way to diagnose and monitor autoimmune kidney diseases.

Area of Science:

  • Nephrology
  • Immunology
  • Cell Biology

Background:

  • Chronic kidney disease impacts 10% of the global population.
  • Podocyte damage is central to kidney disease progression.
  • Membranous nephropathy (MN) involves autoantibodies attacking kidney podocytes, causing nephrotic syndrome.

Purpose of the Study:

  • Investigate the mechanism of podocyte damage in membranous nephropathy.
  • Identify urinary biomarkers for autoimmune kidney diseases.
  • Explore novel diagnostic and therapeutic strategies for MN.

Main Methods:

  • Characterization of autoimmunoglobulin-triggered extracellular vesicles (AIT-EVs) from podocytes.
  • Analysis of AIT-EV composition, including autoantibodies, antigens, and podocyte proteins.
  • Correlation of urinary AIT-EVs with glomerular pathology in MN patients.

Main Results:

  • Autoantibodies attacking podocyte foot processes trigger the formation and release of AIT-EVs.
  • AIT-EVs contain pathogenic autoantibodies, target antigens, and essential podocyte proteins.
  • Urinary AIT-EVs in MN patients reflect glomerular immune complex aggregates and podocyte damage.

Conclusions:

  • AIT-EVs represent a novel mechanism of podocyte injury and waste removal in autoimmune kidney disease.
  • Urinary AIT-EVs can be enriched to detect and monitor disease-specific autoantibodies.
  • This discovery suggests a potential non-invasive diagnostic and therapeutic approach for membranous nephropathy and other autoimmune kidney diseases.
Keywords:
14-3-3ADAM10PLA(2)R1THSD7Aautoantibodyclearanceextracellular vesiclefoot process effacementmembranous nephropathypodocyte

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