CD4 and renal fibrosis: I. Antigen presentation to CD4+ T cellsDC (27)II. Accumulation of Th17 cells DC (28)III. TNFa, TGFb production DC (28, 68) Macrophages (68)IV. Tubular apoptosis DC (68) Macrophages (68)V. Renal fibrosis DC (68, 69) Macrophages (68, 69)