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C3a receptor blockade protects podocytes from injury in diabetic nephropathy

Marina Morigi1, Luca Perico1, Daniela Corna1

  • 1Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Centro Anna Maria Astori, Science and Technology Park Kilometro Rosso, Bergamo, Italy.

JCI Insight
|March 13, 2020
PubMed

Insights

Complement C3a drives kidney damage in diabetic nephropathy by harming podocytes and mitochondria. Blocking C3a receptor (C3aR) protects podocytes, reduces proteinuria, and preserves kidney function in diabetic mice.

Area of Science:

  • Nephrology
  • Immunology
  • Mitochondrial Biology

Background:

  • Diabetic nephropathy (DN) involves complement system activation in the kidneys, but its role in podocyte injury is unclear.
  • Glomerular C3a, a product of complement activation, may contribute to podocyte damage and proteinuria in DN.
  • Understanding the link between complement activation and podocyte dysfunction is crucial for developing new DN therapies.

Purpose of the Study:

  • To investigate whether glomerular C3a promotes podocyte damage and renal injury in a mouse model of type 2 diabetes.
  • To explore the mechanisms by which C3a affects podocyte integrity, focusing on mitochondrial function.
  • To evaluate the therapeutic potential of blocking the C3a receptor (C3aR) in DN.

Main Methods:

  • Utilized BTBR ob/ob mice as a model for type 2 diabetes with diabetic nephropathy.
  • Assessed podocyte loss, albuminuria, glomerular injury, and complement deposition (C3).
  • Measured levels of C3a, C3a receptor (C3aR), podocyte markers (nephrin, α-actinin4), and mitochondrial proteins (SOD2).
  • Administered a C3aR antagonist to DN mice and evaluated its effects on renal parameters and podocyte health.
  • Investigated C3a effects on cultured podocytes, including mitochondrial morphology, membrane potential, and metabolism.
  • Examined the impact of SS-31, a mitochondrial-protective peptide, on C3a-induced podocyte motility.

Main Results:

  • DN mice showed podocyte loss, albuminuria, glomerular injury, and increased glomerular C3a and C3aR.
  • C3aR antagonist treatment improved podocyte density, reduced proteinuria, and limited glomerular injury.
  • C3a induced mitochondrial dysfunction in podocytes, including altered morphology, reduced SOD2, and impaired metabolism.
  • C3aR blockade normalized mitochondrial function and protected podocytes.
  • SS-31 mitigated C3a-induced podocyte motility reduction.

Conclusions:

  • Glomerular C3a promotes podocyte damage and renal injury in diabetic nephropathy.
  • C3a-induced podocyte dysfunction is mediated by mitochondrial alterations.
  • Blocking C3aR is a promising therapeutic strategy for diabetic nephropathy.
  • Maintaining mitochondrial function is key to preserving podocyte integrity in DN.
Keywords:
ComplementDiabetesMitochondriaNephrology

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