Journal of nephrology

Renoprotective effect of epoetin beta pegol by the prevention of M2 macrophage recruitment in Thy-1 rats.

PMID 24821659


Glomerulonephritis (GN) develops via accumulation of extracellular matrix through macrophage recruitment in glomeruli. It is unclear whether epoetin beta pegol (continuous erythropoietin receptor activator, CERA), a long-acting erythropoiesis-stimulating agent, exerts a renoprotective effect by preventing glomerulosclerosis. We examined the renoprotective effect of CERA in rats with Thy-1 glomerulonephritis (Thy-1-GN), an animal model for mesangial proliferative glomerulonephritis. Thy-1-GN was induced in F344 rats by injection of anti-Thy1.1 antibody. CERA (25 µg/kg) was intravenously administered 4 h before anti-Thy1.1 antibody injection. After 6 days, blood and urine was collected for biochemical analysis and kidneys harvested for analysis of histopathology and mRNA expression. In Thy-1-GN rats, CERA suppressed increased urinary total protein, urea nitrogen, and N-acetyl-β-(D)-glucosaminidase. CERA significantly prevented glomerulosclerosis and expression of α-smooth muscle actin, collagen-1, and fibronectin. Increased macrophage infiltration and up-regulated monocyte chemotactic protein-1 were significantly suppressed by CERA. Furthermore, CERA also suppressed up-regulation of arginase-1, a marker of M2 macrophages. Arginase-1 expression levels strongly correlated with levels of collagen-1 and fibronectin mRNA. These results suggest that CERA has potential to protect kidney function through the prevention of glomerulosclerosis, accompanied by prevention of M2 macrophage recruitment.