TY - JOUR
T1 - Macrophage-mediated renal injury is dependent on signaling via the JNK pathway
AU - Ikezumi, Yohei
AU - Hurst, Lyn
AU - Atkins, Robert C.
AU - Nikolic-Paterson, David J.
PY - 2004/7
Y1 - 2004/7
N2 - Macrophage accumulation is a prominent feature in most forms of human glomerulonephritis and correlates with renal dysfunction. Macrophages can directly mediate acute renal injury in animal models, but the mechanisms of macrophage activation required for mediating renal injury are unknown. This study examined whether activation of the Jun amino terminal kinase (JNK) signaling pathway is necessary for macrophage-mediated renal injury. An adoptive transfer model was used in which rats were immunized with sheep IgG (day -5), made leukopenic by administration of cyclophosphamide (CyPh) (day -2), and then injected with sheep anti-glomerular basement membrane (GBM) serum (day 0). Animals were then given an intravenous injection of bone marrow-derived macrophages (BMM) (day 1) and killed 24 h later (day 2). The induction of proteinuria and glomerular cell proliferation (PCNA+ cells) in CyPh-treated anti-GBM disease was dependent on transfer of BMM. Exposure of BMM to the specific JNK inhibitor, SP600125, for 3 h before adoptive transfer had no effect on glomerular accumulation of BMM in CyPh-treated anti-GBM disease. However, SP600125 treatment of BMM caused a 75% reduction in proteinuria and a 70% reduction in glomerular cell proliferation (P < 0.01 versus vehicle or untreated BMM). In conclusion, this study has defined a critical role for the JNK signaling pathway in macrophage-mediated renal injury.
AB - Macrophage accumulation is a prominent feature in most forms of human glomerulonephritis and correlates with renal dysfunction. Macrophages can directly mediate acute renal injury in animal models, but the mechanisms of macrophage activation required for mediating renal injury are unknown. This study examined whether activation of the Jun amino terminal kinase (JNK) signaling pathway is necessary for macrophage-mediated renal injury. An adoptive transfer model was used in which rats were immunized with sheep IgG (day -5), made leukopenic by administration of cyclophosphamide (CyPh) (day -2), and then injected with sheep anti-glomerular basement membrane (GBM) serum (day 0). Animals were then given an intravenous injection of bone marrow-derived macrophages (BMM) (day 1) and killed 24 h later (day 2). The induction of proteinuria and glomerular cell proliferation (PCNA+ cells) in CyPh-treated anti-GBM disease was dependent on transfer of BMM. Exposure of BMM to the specific JNK inhibitor, SP600125, for 3 h before adoptive transfer had no effect on glomerular accumulation of BMM in CyPh-treated anti-GBM disease. However, SP600125 treatment of BMM caused a 75% reduction in proteinuria and a 70% reduction in glomerular cell proliferation (P < 0.01 versus vehicle or untreated BMM). In conclusion, this study has defined a critical role for the JNK signaling pathway in macrophage-mediated renal injury.
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U2 - 10.1097/01.ASN.0000131272.06958.DE
DO - 10.1097/01.ASN.0000131272.06958.DE
M3 - Article
C2 - 15213265
AN - SCOPUS:3042628478
SN - 1046-6673
VL - 15
SP - 1775
EP - 1784
JO - Journal of the American Society of Nephrology
JF - Journal of the American Society of Nephrology
IS - 7
ER -