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Vitamin D/VDR Protects Against Diabetic Kidney Disease by Restoring Podocytes Autophagy

Zhixia Song1, Chao Xiao2, Xiaoli Jia2

  • 1Department of Nephrology, The First Clinical Medical College of Three Gorges University, Center People's Hospital of Yichang, Yichang, 443000, People's Republic of China.

Diabetes, Metabolic Syndrome and Obesity : Targets and Therapy
|April 23, 2021
PubMed
Abstract

Insights

Vitamin D signaling, through the Vitamin D Receptor (VDR), protects against diabetic nephropathy by restoring podocyte autophagy. This study highlights calcitriol

Area of Science:

  • Nephrology
  • Endocrinology
  • Cell Biology

Background:

  • Diabetic nephropathy is a major complication of diabetes, characterized by progressive kidney damage.
  • Podocyte injury and autophagy dysfunction are key pathological features in diabetic nephropathy.
  • Vitamin D Receptor (VDR) signaling plays a role in kidney health, but its specific impact on podocyte autophagy in diabetic nephropathy is unclear.

Purpose of the Study:

  • To investigate the effect of vitamin D/VDR signaling on podocyte autophagy in diabetic nephropathy.
  • To explore the therapeutic potential of calcitriol (active vitamin D) in mitigating podocyte injury and restoring autophagy in diabetic nephropathy.

Main Methods:

  • Analysis of kidney tissue from diabetic nephropathy patients and healthy controls using electron microscopy and VDR immunohistochemistry.
  • Induction of diabetic rat models using streptozotocin (STZ) and treatment with calcitriol.
  • In vitro studies using a podocyte cell line (MPC-5) cultured under high glucose conditions, with or without calcitriol, to assess podocyte injury and autophagy markers (LC3II/I, Beclin-1, p62).

Main Results:

  • Diabetic nephropathy was associated with decreased VDR and autophagosomes in podocytes.
  • Calcitriol treatment in diabetic rats and cultured podocytes attenuated kidney damage, proteinuria, glomerular sclerosis, and podocyte injury.
  • Calcitriol treatment restored podocyte autophagy, evidenced by normalized LC3II/I, Beclin-1, and p62 levels, and increased autophagosomes.

Conclusions:

  • Calcitriol/VDR signaling attenuates diabetic nephropathy and podocyte injury by restoring podocyte autophagy.
  • This study provides evidence for the protective mechanisms of calcitriol/VDR in diabetic nephropathy, suggesting potential therapeutic applications.
Keywords:
autophagycalcitrioldiabetic nephropathypodocytevitamin D receptor

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