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CXCL10 induces the recruitment of monocyte-derived macrophages into kidney, which aggravate puromycin aminonucleoside nephrosis #MMPMID25561167
Petrovic-Djergovic D; Popovic M; Chittiprol S; Cortado H; Ransom RF; Partida-Sánchez S
Clin Exp Immunol 2015[May]; 180 (2): 305-15 PMID25561167show ga
The mechanism responsible for trafficking of monocyte-derived macrophages into kidney in the puromycin aminonucleoside model of nephrotic syndrome in rats (PAN-NS), and the significance of this infiltration, remain largely unknown. CXCL10, a chemokine secreted in many T helper type 1 (Th1) inflammatory diseases, exhibits important roles in trafficking of monocytes and activated T cells. We hypothesized that induction of circulating interferon (IFN)-? and glomerular tumour necrosis factor (TNF)-? during PAN-NS would stimulate the release of CXCL10 by podocytes, leading to infiltration of activated immune cells and greater glomerular injury. We found that serum IFN-?, glomerular Cxcl10?mRNA and intra- and peri-glomerular macrophage infiltration were induced strongly during the late acute phase of PAN-NS in Wistar rats, but not in nude (Foxn1rnu/rnu) rats lacking functional effector T lymphocytes. Wistar rats also developed significantly greater proteinuria than nude rats, which could be abolished by macrophage depletion. Stimulation of cultured podocytes with both IFN-? and TNF-? markedly induced the expression of Cxcl10?mRNA and CXCL10 secretion. Together, these data support our hypothesis that increased circulating IFN-? and glomerular TNF-? induce synergistically the production and secretion of CXCL10 by podocytes, attracting activated macrophages into kidney tissue. The study also suggests that IFN-?, secreted from Th1 lymphocytes, may prime proinflammatory macrophages that consequently aggravate renal injury.