Compensatory glomerular growth after unilateral nephrectomy is VEGF dependent

Area of Science:

• Nephrology
• Renal Physiology
• Molecular Biology

Background:

• Kidney enlargement involves various growth factors and cytokines.
• Vascular Endothelial Growth Factor (VEGF) is crucial for renal development and diabetic glomerular enlargement.
• Insulin-like Growth Factor I (IGF-I) is implicated in compensatory renal growth, with VEGF potentially mediating its effects.

Purpose of the Study:

• To investigate the role of VEGF in compensatory renal changes following uninephrectomy.
• To assess the impact of a neutralizing VEGF-antibody (VEGF-Ab) on glomerular volume and kidney weight.
• To examine the relationship between VEGF, IGF-I, and compensatory renal growth.

Main Methods:

• Uninephrectomized mice were treated with either a neutralizing VEGF-antibody (VEGF-Ab) or a placebo for 7 days.
• Kidney weight and glomerular volume were measured.
• Serum and kidney levels of Insulin-like Growth Factor I (IGF-I) were quantified.

Main Results:

• Placebo-treated mice showed increased kidney IGF-I, glomerular volume, and kidney weight post-uninephrectomy.
• VEGF-Ab treatment abolished increased glomerular volume and partially blocked renal hypertrophy.
• The renal effects of VEGF-Ab were observed without altering renal IGF-I levels.

Conclusions:

• Compensatory glomerular growth after uninephrectomy is dependent on VEGF.
• VEGF plays a significant role in renal hypertrophy following kidney removal.
• The compensatory renal growth mediated by VEGF occurs independently of changes in renal IGF-I levels.