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Fyn Mediates High Glucose-Induced Actin Cytoskeleton Reorganization of Podocytes via Promoting ROCK Activation In

Zhimei Lv1, Mengsi Hu1, Xiaoxu Ren1

  • 1Department of Nephrology, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China.

Journal of Diabetes Research
|February 17, 2016
PubMed

Insights

Fyn kinase activation drives high glucose-induced podocyte damage by altering actin cytoskeleton. Targeting Fyn, not ROCK, may reverse this damage, offering insights into diabetic nephropathy.

Area of Science:

  • Nephrology
  • Cell Biology
  • Biochemistry

Background:

  • Fyn, a Src family tyrosine kinase, regulates cytoskeletal remodeling.
  • Fyn mediates nephrin tyrosine phosphorylation, leading to actin polymerization and podocyte damage.
  • The specific role of Fyn in podocytes requires further elucidation.

Purpose of the Study:

  • To investigate the role of Fyn/ROCK signaling in high glucose-induced podocyte cytoskeletal remodeling.
  • To explore the interaction between Fyn, ROCK, and paxillin in podocytes under high glucose conditions.

Main Methods:

  • Utilized siRNA to knock down Fyn expression in podocytes.
  • Administered ROCK inhibitors to assess their effects on Fyn phosphorylation.
  • Monitored filamentous actin (F-actin) rearrangement, paxillin phosphorylation, and cell motility.

Main Results:

  • High glucose induced F-actin rearrangement, paxillin phosphorylation, and increased podocyte motility.
  • Fyn and ROCK signaling pathways were significantly activated under high glucose conditions.
  • Fyn knockdown reversed high glucose-induced podocyte damage and ROCK activation, while ROCK inhibition had no effect on Fyn phosphorylation.

Conclusions:

  • Fyn activation is a key mediator of high glucose-induced actin cytoskeleton remodeling in podocytes.
  • Fyn promotes ROCK activation and paxillin phosphorylation, contributing to podocyte damage.
  • Fyn, rather than ROCK, is the primary driver of these changes in vitro.

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