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Mesangial Cell-Derived Exosomal miR-4455 Induces Podocyte Injury in IgA Nephropathy by Targeting ULK2

Mengjie Yu1,2, Xiaogang Shen3, Wenfang He2

  • 1Bengbu Medical College, Bengbu, Anhui 233000, China.

Oxidative Medicine and Cellular Longevity
|November 17, 2022
PubMed

Insights

Mesangial cells (MCs) secrete exosomes containing miR-4455 that damage podocytes in IgA nephropathy (IgAN). This exosomal miR-4455 disrupts autophagy, offering potential therapeutic targets for IgAN.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Cell Biology

Background:

  • Mesangial cells (MCs) are implicated in IgA nephropathy (IgAN) pathogenesis via aIgA1 secretion.
  • The precise mechanisms by which MCs influence podocyte injury in IgAN are not fully understood.

Purpose of the Study:

  • To investigate the role of MC-derived exosomes in podocyte injury in IgAN.
  • To elucidate the molecular mechanisms underlying MC-mediated podocyte damage.

Main Methods:

  • Treatment of podocytes with exosomes derived from MCs exposed to aIgA1.
  • Analysis of exosomal miRNA content and its transfer to podocytes.
  • Investigation of the molecular targets and downstream effects of miR-4455 in podocytes, including autophagy-related proteins (ULK2, LC3II/I, P62).

Main Results:

  • Exosomes derived from aIgA1-treated MCs induced podocyte injury.
  • miR-4455 was significantly upregulated in these exosomes and transferred to podocytes.
  • MC-derived exosomal miR-4455 directly targeted ULK2, altering LC3II/I and P62 levels, thereby disrupting autophagy homeostasis and causing podocyte injury.

Conclusions:

  • MC-derived exosomal miR-4455 is a critical mediator of podocyte injury in IgA nephropathy.
  • The miR-4455/ULK2/autophagy pathway represents a novel mechanism contributing to IgAN pathogenesis.
  • This pathway offers potential therapeutic targets for IgAN treatment.

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