Abstract
Bone morphogenetic protein-7 (BMP-7) plays a critical role in renal development, accelerates recovery from acute renal injury, and more recently it has been shown to delay progressive renal disease. The present study was designed to investigate the effect of BMP-7 on interstitial fibrosis in the rat protein-overloaded model. Renal disease was induced in 26 rats by daily intraperitoneal injections of bovine serum albumin (BSA); controls (n = 28) were injected with saline. Half of the rats in each group were treated with human recombinant BMP-7 (300 microg/kg i.p. 3 times weekly) and half with placebo. Animals were killed after 3 or 6 weeks. Compared to the saline control groups, the BSA groups had evidence of chronic renal disease: significantly increased urinary protein excretion rates; total kidney collagen content, and increased fibronectin and collagen III interstitial areas. By 6 weeks the BSA + BMP-7 group compared to the BSA + placebo group had a nonsignificant decrease in blood urea nitrogen (40 +/- 13 vs. 46 +/- 11 mg/dl), total kidney collagen (10.8 +/- 2.1 vs. 12.2 +/- 3.5 microg/kidney), fibronectin interstitial area (23 +/- 4 vs. 25 +/- 8%) and collagen III interstitial area (22 +/- 6 vs. 28 +/- 7%). Despite these r...Continue Reading
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