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Effects of podocyte injury on glomerular development
Ji Ma1, Michele Rossini, Hai-Chun Yang
1Division of Pediatric Nephrology, Department of Pathology, Vanderbilt University Medical Center, Nashville, TN 37232, USA, and Division of Nephrology, Hua Shan Hospital, Shanghai 200040, China.
Pediatric Research
|August 2, 2007
Summary
Neonatal podocyte injury in mice disrupts glomerular development, leading to fewer capillaries and later onset of proteinuria, hypertension, and glomerulosclerosis.
Area of Science:
- Nephrology
- Developmental Biology
- Molecular Medicine
Background:
- Podocyte injury is implicated in various kidney diseases.
- Glomerular development is crucial for kidney function.
- Understanding the mechanisms linking podocyte injury to developmental defects is important.
Purpose of the Study:
- To investigate the impact of early-life podocyte injury on glomerular maturation in mice.
- To elucidate the underlying molecular mechanisms of these effects.
Main Methods:
- Puromycin aminonucleoside (PAN) was administered to neonatal mice.
- Kidney and body weights were measured.
- Electron microscopy (EM) was used to assess podocyte morphology.
- Glomerular capillary loop formation, endothelial markers (CD31), and maturation index were evaluated.
- Gene expression of vascular growth factors (Flk-1, Tie2, VEGF) and angiopoietins (Ang-1) was analyzed.
- Proteinuria, glomerulosclerosis, and blood pressure were monitored.
Main Results:
- PAN-injected mice exhibited reduced kidney and body weights and impaired glomerular maturation.
- Early podocyte effacement preceded proteinuria.
- Fewer glomerular capillary loops and decreased CD31+ endothelium were observed.
- Glomerulosclerosis, proteinuria, and hypertension developed later in PAN-injected mice.
- Altered expression of Flk-1, Tie2, and Ang-1 was noted post-injury.
Conclusions:
- Podocyte injury in neonatal kidneys disrupts glomerular capillary development.
- This disruption is mediated by altered expression of key capillary growth modulators.
- Early podocyte injury leads to long-term consequences including proteinuria, hypertension, and glomerulosclerosis.
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