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Cux-1 transgenic mice develop glomerulosclerosis and interstitial fibrosis
Jennifer G Brantley1, Madhulika Sharma, Neal I Alcalay
1Department of Anatomy and Cell Biology and University of Kansas Medical Center, Kansas City, Kansas 66160, USA.
Kidney International
|March 13, 2003
Summary
Ectopic expression of the Cux-1 gene in mice causes mesangial cell proliferation and expansion, leading to early signs of glomerulonephritis and kidney damage. This study highlights Cux-1
Area of Science:
- Nephrology
- Developmental Biology
- Molecular Genetics
Background:
- Cux-1 is a homeobox gene crucial for kidney development.
- Ectopic Cux-1 expression in mice induces renal hyperplasia and downregulates p27.
- Reduced p27 is linked to mesangial cell proliferation and glomerular disease.
Purpose of the Study:
- To investigate glomerular changes in Cux-1 transgenic mice.
- To assess the role of Cux-1 in mesangial cell proliferation and matrix deposition.
- To evaluate the impact of Cux-1 on renal function and podocyte architecture.
Main Methods:
- Morphological analysis of adult transgenic mouse kidneys.
- Immunohistochemistry to quantify glomerular cell numbers.
- Immunofluorescence and Western blotting for type IV collagen deposition.
- Assessment of renal function via serum and urine analysis.
Main Results:
- Ectopic Cux-1 expression in mesangial cells increased cell proliferation and mesangial matrix expansion.
- Increased type IV collagen deposition and podocyte foot process effacement were observed.
- Transgenic mice showed interstitial fibrosis and increased urinary albumin excretion.
Conclusions:
- Increased Cux-1 expression in mesangial cells drives proliferation and matrix expansion.
- Cux-1-induced changes disrupt podocyte architecture, impairing kidney filtration.
- Cux-1 expression is sufficient to initiate early-stage mesangioproliferative glomerulonephritis.