Treatment of protein degradation disorders

1. A method of treating a subject suffering from a solid tumor comprising administering to the subject a therapeutically effective amount of a proteasome inhibitor and an aggresome inhibitor, wherein the aggresome inhibitor selectively inhibits HDAC6.

2. The method of claim 1 , wherein the solid tumor is a breast, lung, liver, colon or prostate solid tumor.

3. The method of claim 1 , wherein the proteasome inhibitor is selected from the group consisting of bortezomib, MG132, sapojargon, and NPI-0052.

4. The method of claim 1 , wherein the aggresome inhibitor is of the formula:

or a pharmaceutically acceptable salt thereof,

wherein:

R 1 is cyclic or acyclic, substituted or unsubstituted, branched or unbranched aliphatic; cyclic or acyclic, substituted or unsubstituted, branched or unbranched heteroaliphatic; substituted or unsubstituted, branched or unbranched acyl; substituted or unsubstituted aryl; substituted or unsubstituted heteroaryl; —OR A ; —C(═O)R A ; —CO 2 R A ; —SR A ; —SOR A ; —SO 2 R A ; —N(R A ) 2 ; —NHC(O)R A ; or —C(R A ) 3 ; wherein each occurrence of R B is independently a hydrogen, a protecting group, an aliphatic moiety, a heteroaliphatic moiety, an acyl moiety; an aryl moiety; a heteroaryl moiety; alkoxy; aryloxy; alkylthio; arylthio; amino, alkylamino, dialkylamino, heteroaryloxy; or heteroarylthio moiety;

R 2 is hydrogen; halogen; cyclic or acyclic, substituted or unsubstituted, branched or unbranched aliphatic; cyclic or acyclic, substituted or unsubstituted, branched or unbranched heteroaliphatic; substituted or unsubstituted, branched or unbranched acyl; substituted or unsubstitued aryl; substituted or unsubstituted heteroaryl; —OR B ; —C(═O)R B ; —CO 2 R B ; —CN; —SCN; —SR B ; —SOR B ; —SO 2 R B ; —NO 2 ; —N(R B ) 2 ; —NHC(O)R B ; or —C(R B ) 3 ; wherein each occurrence of R B is independently a hydrogen, a protecting group, an aliphatic moiety, a heteroaliphatic moiety, an acyl moiety; an aryl moiety; a heteroaryl moiety; alkoxy; aryloxy; alkylthio; arylthio; amino, alkylamino, dialkylamino, heteroaryloxy; or heteroarylthio moiety; and

R 3 is hydrogen; halogen; cyclic or acyclic, substituted or unsubstituted, branched or unbranched aliphatic; cyclic or acyclic, substituted or unsubstituted, branched or unbranched heteroaliphatic; substituted or unsubstituted, branched or unbranched acyl; substituted or unsubstitued aryl; substituted or unsubstituted heteroaryl; —OR C ; —C(═O)R C ; —CO 2 R C ; —CN; —SCN; —SR C ; —SOR C ; —SO 2 R C ; —NO 2 ; —N(R C ) 2 ; —NHC(O)R C ; or —C(R C ) 3 ; wherein each occurrence of R C is independently a hydrogen, a protecting group, an aliphatic moiety, a heteroaliphatic moiety, an acyl moiety; an aryl moiety; a heteroaryl moiety; alkoxy; aryloxy; alkylthio; arylthio; amino, alkylamino, dialkylamino, heteroaryloxy; or heteroarylthio moiety.

5. The method of claim 1 , wherein the aggresome inhibitor is of the formula:

or a pharmaceutically acceptable salt thereof,

wherein:

R 1 is hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aromatic or heteroaromatic moiety;

n is 1-5;

R 2 is hydrogen, a protecting group, or an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aromatic or heteroaromatic moiety;

X is —O—, —C(R 2A ) 2 —, —S—, or —NR 2A —, wherein R 2A is hydrogen, a protecting group, or an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aromatic or heteroaromatic moiety;

or wherein two or more occurrences of R 2 and R 2A , taken together, form an alicyclic or heterocyclic moiety, or an aryl or heteroaryl moiety;

R 3 is an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aromatic or heteroaromatic moiety; and

Y is hydrogen or an aliphatic, alicyclic, heteroaliphatic, heterocyclic, aromatic or heteroaromatic moiety.

6. The method of claim 1 , wherein the aggresome inhibitor is selected from the group consisting of:

and pharmaceutically acceptable salts thereof.

7. The method of claim 1 , wherein the aggresome inhibitor is the following:

or a pharmaceutically acceptable salt thereof.

8. The method of claim 1 , wherein the aggresome inhibitor is of the following formula:

or a pharmaceutically acceptable salt thereof,

wherein:

each X is independently O, S, CH 2 , or NR 3;

Y is O, S, CH 2 , or NR 4;

Ar 1 and Ar 2 are each independently an aryl group;

R 1 is a lower alkyl group or an aryl group;

R 2 is hydrogen, a lower alkyl group or an aryl group; and

R 3 is hydrogen, a lower alkyl group, an aryl group, an alkylcarbonyl, an alkoxycarbonyl group, or an aminocarbonyl group.

9. The method of claim 8 ,

wherein:

X is for both occurrences O;

Y is S;

Ar 1 is phenyl or substituted phenyl;

Ar 2 is heteroaryl;

R 1 is phenyl or substituted phenyl; and

R 2 is hydrogen.

10. The method of claim 1 , wherein the aggresome inhibitor inhibits the C-terminal aceylation activity of HDAC6, thereby inhibiting aggresome mediated protein degradation.

11. The method of claim 1 , wherein the aggresome inhibitor is dyenin.

12. The method of claim 1 , further comprising obtaining a biological sample from a subject.

13. The method of claim 1 , further comprising administering a therapeutically effective amount of one or more additional protein degradation inhibitors to the subject.

14. The method of claim 13 , wherein at least one of the additional protein degradation inhibitors is an aggresome inhibitor.

15. The method of claim 13 , wherein at least one of the additional protein degradation inhibitors is a proteasome inhibitor.

16. The method of claim 1 , further comprising monitoring the treatment or progress of the subject.

17. The method of claim 1 further comprising co-administering one or more of a chemotherapeutic agent, radiation agent, hormonal agent, biological agent, or an anti-nflammatory agent to the subject.

18. The method of claim 17 , wherein the chemotherapeutic agent is tamoxifen, trastuzamab, raloxifene, doxorubicin, fluorouracil/5-fu, pamidronate disodium, anastrozole, exemestane, cyclophosphamide, epirubicin, letrozole, toremifene, fulvestrant, fluoxymesterone, trastuzumab, methotrexate, megastrol acetate, docetaxel, paclitaxel, testolactone, aziridine, vinblastine, capecitabine, goselerin acetate, zoledronic acid, taxol, or vincristine.

19. The method of claim 8 ,

wherein:

X is for both occurrences O;

Y is S;

Ar 1 is phenyl or substituted phenyl;

Ar 2 is optionally substituted oxazolyl;

R 1 is 4-aminosubstituted phenyl; and

R 2 is hydrogen.

20. The method of claim 1 , wherein the subject is a human.