mRNA expressions of molecules involved in the accumulation of ECM. (a) Northern blot analyses of TGF-β1 expressions at day 5 (left) and day 14 (right) after UUO in wild-type mice with Agtr1–/– marrow and wild-type mice with Agtr1+/+ marrow. (b and c) Northern blot analyses of α1(I) collagen, MMP-2, and TIMP-1 at day 5 (b) and day 14 (c) after UUO. Lane 1 in (b) and (c) shows control contralateral nonobstructed kidney, lane 2 shows mice with Agtr1–/– marrow, and lane 3 shows mice with Agtr1+/+ marrow.