iRNA conjugates

1 . An iRNA agent comprising a sense sequence and an antisense sequence, wherein the iRNA agent comprises a stabilizing modification, and wherein the antisense sequence targets an RNA expressed in kidney.

2 . The iRNA agent of claim 1 , wherein the stabilizing modification is a cationic group.

3 . The iRNA agent of claim 1 , wherein the stabilizing modification is a 2′-O-alkyl amine, 2′-O-alkoxyalkyl amine, a polyamine, a C5-cationic modified pyrimidine, a cationic peptide, guanidinium group, amidininium group or a cationic amino acid.

4 . The iRNA agent of claim 1 , further comprising a modification that alters the distribution of the iRNA agent in favor of the kidney.

5 . The iRNA agent of claim 4 , wherein the modification is one or more of the following: a cationic group; a carbohydrate sugar; an enzyme or enzyme substrate; folic acid; a protein; a water soluble molecule; an RGD peptide, or any derivative or analog thereof, or a synthetic molecule capable of targeting alpha v-beta 3 integrin.

6 . The iRNA agent of claim 5 , wherein the iRNA agent binds alpha v-beta 3 integrin.

7 . The iRNA agent of claim 1 , wherein the sense sequence comprises one or more asymmetrical 2′O alkyl amine modifications.

8 . The iRNA agent of claim 1 , wherein the antisense sequence comprises one or more asymmetrical phosphorothioate modifications.

9 . The iRNA agent of claim 7 , wherein at least one of said 2′-O-alkyl amine modifications is a 2′-O-propylamine or 2′-O-(dimethylaminooxyethyl) modification.

10 . The iRNA agent of claim 1 , having a nucleobase modification.

11 . The iRNA agent of claim 10 , wherein said nucleobase modification is selected from a C-5 pyrimidine, an N-2 purine, an N-7 purine, and an N-6 purine modification.

12 . The iRNA agent of claim 1 having a modification which includes a cationic group or a Zwitterionic group.

13 . The iRNA agent of claim 12 , wherein said modification is at a terminus.

14 . The iRNA agent of claim 1 , modified to include one or more of a cationic group or a Zwitterionic group at a 2′ position of a sugar, a 3′ position of a sugar, the C-5 of a pyrimidine, the N-2 of a purine, the N-7 of a purine, or the N-6 of a purine.

15 . The iRNA agent of claim 1 , modified to include a guanidinium group at a 2′ position of a sugar, a 3′ position of a sugar, the C-5 of a pyrimidine, the N-2 of a purine, the N-7 of a purine, or the N-6 of a purine.

16 . The iRNA agent of claim 1 , wherein the sense sequence has at least 2 asymmetrical 2′-O alkyl amine modifications.

17 . (canceled)

18 . The iRNA agent of claim 1 , wherein the iRNA agent comprises an asymmetrical modification which is a 2′-OMe modifications modification.

19 - 25 . (canceled)

26 . The iRNA agent of claim 1 , wherein the antisense sequence has at least 4 asymmetrical phosphorothioate modifications.

27 . The iRNA agent of claim 1 , wherein the antisense sequence has at least 6 asymmetrical phosphorothioate modifications.

28 . (canceled)

29 . A method for treating a subject having or at risk for having a disorder of the kidney, the method comprising administering to a subject an iRNA agent which targets an RNA expressed in the kidney, wherein said agent is modified to alter its distribution in favor of the kidney.

30 . (canceled)

31 . The method iRNA agent of claim 1 , wherein the iRNA agent is at least 21 nucleotides in length, and the duplex region of the iRNA agent is about 19 nucleotides in length.

32 . The iRNA agent of claim 1 , wherein the iRNA agent comprises a sense sequence and an antisense sequence, wherein the sense sequence has one or more asymmetrical 2′-OMe modifications and the antisense sequence has one or more asymmetrical phosphorothioate modifications.

33 - 47 . (canceled)

48 . The iRNA agent of claim 1 , wherein the iRNA agent targets a nucleic acid encoding one of the following: a chemokine, a complement factor, a growth factor, a growth factor receptor, a cytokine, or a vasoactive protein.

49 . The iRNA agent of claim 1 , wherein the iRNA agent targets one of the following: MCP1, osteopontin, RANTES, TGFbeta, TNFalpha, PDGF, IGF-1, IGF-2, VEGF, EL alpha, ET1, angiotensin II, PPARalpha, PPARbeta/delta, PPARgamma, B7-1, B7-2, ICOS, CD40, or CD154.

50 - 52 . (canceled)

53 . A preparation of an iRNA agent which targets an RNA expressed in the kidney wherein said agent is modified to alter its distribution in favor of the kidney.

54 - 60 . (canceled)

61 . A pharmaceutical preparation comprising an iRNA agent and a pharmaceutically acceptable carrier, wherein the iRNA agent targets an RNA expressed in the kidney wherein said agent is modified to alter its distribution in favor of the kidney.

62 . A composition comprising an iRNA agent and a ligand, wherein the ligand binds a human serum protein.