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Urinary proteins from patients with nephrotic syndrome alters the signalling proteins regulating

Qiong Wen1, Zhao Huang, Shu-Feng Zhou

  • 1Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.

Nephrology (Carlton, Vic.)
|April 10, 2010
PubMed

Insights

Urinary proteins from Minimal Change Disease (MCD) and Focal Segmental Glomerulosclerosis (FSGS) alter epithelial-mesenchymal transition (EMT) markers via distinct signaling pathways. This highlights how proteinuria quality influences kidney disease progression.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Cellular Biology

Background:

  • Proteinuria significantly contributes to tubulointerstitial fibrosis.
  • The precise mechanisms behind differential renal damage caused by proteinuria remain unclear.
  • Minimal Change Disease (MCD) and Focal Segmental Glomerulosclerosis (FSGS) represent distinct nephrotic syndromes with varying clinical outcomes.

Purpose of the Study:

  • To investigate the impact of urinary proteins from MCD and FSGS patients on epithelial-mesenchymal transition (EMT) markers in cultured proximal tubular HK-2 cells.
  • To elucidate the role of specific signaling pathways, namely ERK1/2 and p38, in mediating the effects of these urinary proteins.

Main Methods:

  • Extraction of urinary proteins from MCD and FSGS patients via ultrafiltration.
  • Incubation of extracted proteins with HK-2 cells to assess expression of EMT markers: cytokeratin-18, alpha-smooth muscle actin (α-SMA), and vimentin.
  • Measurement of p38 and extracellular regulated kinase (ERK) activation using western blotting.
  • Utilisation of specific inhibitors (SB203580 for p38, PD98059 for ERK1/2) to block signaling pathways.

Main Results:

  • Urinary proteins from FSGS patients induced significantly higher expression of α-SMA and vimentin, and lower expression of cytokeratin-18 compared to MCD proteins in HK-2 cells.
  • Both ERK1/2 and p38 signaling pathways were activated by urinary proteins from both MCD and FSGS patients.
  • Inhibition of p38 (SB203580) and ERK1/2 (PD98059) pathways abolished the effects of FSGS urinary proteins on EMT markers. Only p38 inhibition affected the response to MCD urinary proteins.

Conclusions:

  • Urinary proteins from MCD and FSGS patients induce differential changes in EMT-related proteins by activating distinct mitogen-activated protein kinase (MAPK) signaling pathways.
  • The quality of proteinuria is a critical factor influencing the severity and progression of tubular injury in different kidney diseases.
  • Further research into the molecular mechanisms underlying distinct clinical presentations of nephrotic syndromes is essential.

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