Angiogenic and angiostatic factors in renal scleroderma-associated vasculopathy

Area of Science:

• Rheumatology
• Nephrology
• Vascular Biology

Background:

• Systemic sclerosis (SSc) is characterized by impaired angiogenesis, leading to microvascular damage, poor vascular repair, and fibrosis.
• An imbalance of pro-angiogenic and anti-angiogenic factors is implicated in SSc progression.
• Intrarenal resistance index serves as an indicator of renal vasculopathy in SSc patients.

Purpose of the Study:

• To investigate the levels of vascular endothelial growth factor (VEGF) and endostatin in SSc patients.
• To correlate these angiogenic and angiostatic factors with intrarenal hemodynamic parameters, specifically the resistive index.

Main Methods:

• Serum VEGF and endostatin levels were measured in 91 SSc patients.
• Renal Doppler ultrasound was performed on all participants to assess intrarenal hemodynamic parameters.
• Statistical analyses were conducted to determine correlations between serum factors and clinical/ultrasound findings.

Main Results:

• A significant positive correlation was found between serum endostatin levels and renal Doppler parameters (p<0.0001).
• Serum endostatin showed a negative correlation with estimated glomerular filtration rate (eGFR) (p<0.01).
• Higher endostatin levels were observed in SSc patients with elevated resistive indices, advanced nailfold capillaroscopy damage, and digital ulcers.

Conclusions:

• This study is the first to link intrarenal hemodynamic parameters and endostatin levels in SSc patients.
• Endostatin emerges as a significant biomarker for scleroderma-associated vasculopathy affecting the kidneys in SSc.
• Findings highlight the role of endostatin in the pathogenesis of renal complications in systemic sclerosis.