Neutrophil and macrophage infiltration in renal ischemia/reperfusion injury (IRI). Groups of mice (n = 10) were treated with vehicle, 10 or 30 mg/kg/BID GS-642462 and compared to sham controls (n = 6). (A–C) Immunostaining of Ly6G+ peroxidases. (A) Sham control lacks neutrophils. (B) Vehicle-treated IRI shows many infiltrating neutrophils in an area of tubular damage. (C) IRI treated with 30 mg/kg GS-642362 shows a dramatic reduction in neutrophil infiltration. Bar = 100 µm. (D) Graph of Ly6G+ neutrophils. RT-PCR analysis of mRNA levels for (E) CD68, (F) CCL2, (G) TNF, and (H) IL-2. N.S., not significant.