WO2005044839A2 - Stabilized alpha helical peptides and uses thereof - Google Patents
Stabilized alpha helical peptides and uses thereof Download PDFInfo
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- WO2005044839A2 WO2005044839A2 PCT/US2004/038403 US2004038403W WO2005044839A2 WO 2005044839 A2 WO2005044839 A2 WO 2005044839A2 US 2004038403 W US2004038403 W US 2004038403W WO 2005044839 A2 WO2005044839 A2 WO 2005044839A2
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- 0 CC**(C(*)(*C(*)(C(*)=O)NC)NC)=O Chemical compound CC**(C(*)(*C(*)(C(*)=O)NC)NC)=O 0.000 description 2
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Definitions
- Apoptosis or programmed cell death, plays a critical role in the development and maintenance of homeostasis in all multicellular organisms. Susceptibility to apoptosis varies markedly among cells and is influenced by both external and internal cellular events. Positive and negative regulator proteins that mediate cell fate have been defined, and dysregulation of these protein signaling networks has been documented in the pathogenesis of a wide spectrum of human diseases, including a variety of cancers. BCL-2 is the founding member of this family of apoptotic proteins and was first identified at the chromosomal breakpoint of t(14;18)(q32;q21) lymphomas (Bakhashi et al. 1985 Cell 41:899; Cleary et al.
- BCL-2 under the transcriptional control of the immunoglobulin heavy chain locus, generating inappropriately high levels of BCL-2 and resultant pathologic cell survival.
- Such aberrations in apoptosis have been identified in lymphocytic and myelogenous leukemias and a host of other malignancies, and have been linked to tumor progression and acquired resistance to chemotherapy-induced apoptosis.
- the BCL-2 family of proteins has expanded significantly and includes both pro- and anti-apoptotic molecules that provide the checks and balances that govern susceptibility to cell death (FIG. 1).
- BCL-2 The BCL-2 family is defined by the presence of up to four conserved "BCL-2 homology" (BH) domains designated BH1, BH2, BH3, and BH4, all of which include -helical segments (Chittenden et al. 1995 EMBO 14:5589; Wang et al. 1996 Genes Dev. 10:2859).
- Anti-apoptotic proteins, such as BCL-2 and BCL-X L display sequence conservation in all BH domains.
- Pro- apoptotic proteins are divided into "multidomain" members (e.g. BAK, BAX), which possess homology in the BH1, BH2, and BH3 domains, and the "BH3-domain only" members (e.g. BID,
- BAD, BJM, BIK, NOXA, PUMA that contain sequence homology exclusively in the BH3 amphipathic ⁇ -helical segment.
- BCL-2 family members have the capacity to form homo- and heterodimers, suggesting that competitive binding and the ratio between pro- and anti-apoptotic protein levels dictates susceptibility to death stimuli.
- Anti-apoptotic proteins function to protect cells from pro-apoptotic excess, i.e., excessive programmed cell death.
- Additional "security" measures include regulating transcription of pro-apoptotic proteins and maintaining them as inactive conformers, requiring either proteolytic activation, dephosphorylation, or ligand-induced ⁇ conformational change to activate pro-death functions.
- death signals received at the plasma membrane trigger apoptosis via a mitochondrial pathway (FIG. 2).
- the mitochondria can serve as a gatekeeper of cell death by sequestering cytochrome c, a critical component of a cytosolic complex which activates caspase 9, leading to fatal downstream proteolytic events.
- Multidomain proteins such as BCL-2/BCL-X and BAK BAX play dueling roles of guardian and executioner at the mitochondrial membrane, with their activities further regulated by upstream BH3-only members of the BCL-2 family.
- BID is a member of the "BH3-domain only" subset of pro-apoptotic proteins, and transmits death signals received at the plasma membrane to effector pro-apoptotic proteins at the mitochondrial membrane.
- BID has the unique capability of interacting with both pro- and anti-apoptotic proteins, and upon activation by caspase 8, triggers cytochrome c release and mitochondrial apoptosis.
- Deletion and mutagenesis studies determined that the amphipathic ⁇ -helical BH3 segment of pro-apoptotic family members functions as a death domain and thus represents a critical structural motif for interacting with multidomain apoptotic proteins.
- BID can be bound and sequested by anti- apoptotic proteins (e.g., BCL-2 and BCL-X L ) and can trigger activation of the pro-apoptotic proteins BAX and BAK, leading to cytochrome c release and a mitochondrial apoptosis program.
- BAD is also a "BH3-domain only" pro-apoptotic family member whose expression likewise triggers the activation of BAX/B AK.
- BAD displays preferential binding to anti-apoptotic members, BCL-2 and BCL-X L .
- BAD BH3 domain exhibits high affinity binding to BCL-2
- BAD BH3 peptide is unable to activate cytochrome c release from mitochondria in vitro, suggesting that BAD is not a direct activator of BAX/BAK.
- Mitochondria that overexpress BCL-2 are resistant to BID-induced cytochrome c release, but co-treatment with BAD can restore BID sensitivity.
- Induction of mitochondrial apoptosis by BAD appears to result from either: (1) displacement of BAX BAK activators, such as BID and B3D-like proteins, from the BCL-2/BCL-X L binding pocket, or (2) selective occupation of the BCL-2/BCL-XL binding pocket by BAD to prevent sequestration of BID-like proteins by anti-apoptotic proteins.
- BAX BAK activators such as BID and B3D-like proteins
- ⁇ -helices comprised of nonspecific peptide sequence used to induce cell death by disrupting mitochondrial membranes.
- the alpha-helix is one of the major structural components of proteins and is often found at the interface of protein contacts, participating in a wide variety of intermolecular biological recognition events.
- helical peptides such as the BH3 helix, could be used to selectively interfere with or stabilize protein-protein interactions, and thereby manipulate physiologic processes.
- biologically active helical motifs within proteins typically have little structure when taken out of the context of the full-length protein and placed in solution.
- Verdine and colleagues developed an alternate metathesis-based approach, which employed ⁇ , ⁇ - disubstituted non-natural amino acids containing alkyl tethers (Schafmeister et al., 2000 J. Am. Chem. Soc. 122:5891; Blackwell et al. 1994 Angew Chem. Int. Ed. 37:3281).
- This invention is based, in part, on the discovery that stably cross-linking a polypeptide having at least two modified amino acids (a process termed "hydrocarbon stapling") can help to conformationally bestow the native secondary structure of that polypeptide.
- hydrocarbon stapling a process termed "hydrocarbon stapling”
- cross- linking a polypeptide predisposed to have an alpha-helical secondary structure can constrain the polypeptide to its native alpha-helical conformation.
- the constrained secondary structure can increase resistance of the polypeptide to proteolytic cleavage and also increase hydrophobicity.
- the polypeptides can penetrate the cell membrane (e.g., through an energy-dependent transport mechanism, e.g., pinocytosis).
- the crosslinked polypeptides described herein can have improved biological activity relative to a corresponding uncrosslinked polypeptide.
- the cross-linked polypeptide can include an alpha- helical domain of a BCL-2 family member polypeptide (e.g., BID-BH3 domain), which can bind to BAK/BAX and/or BCL-2/BCL-X L to promote apoptosis in a subject.
- the crosslinked polypeptide can be used to inhibit apoptosis.
- the cross-linked polypeptides described herein can be used therapeutically, e.g., to treat cancer in a subject.
- the invention features polypeptide of formula (I),
- each Ri and R 2 are independently H or a Ci to Cio alkyl, alkenyl, alkynyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocyclylalkyl;
- R 3 is alkyl, alkenyl, alkynyl; [R -K-R ] admir; each of which is substituted with 0-6 R 5 ;
- R 4 is alkyl, alkenyl, or alkynyl;
- R 5 is halo, alkyl, OR 6 , N(R 6 ) 2 , SR 6 , SOR 6 , SO 2 R 6 , CO 2 R 6 , R 6 , a fluorescent moiety, or a radioisotope;
- O K is O, S, SO, SO 2 , CO, CO 2 , CONR 6 , or ;
- R 6 is H, alkyl, or a therapeutic agent;
- n is an integer from 1-4;
- the polypeptide binds to a BCL-2 family protein.
- the polypeptide can bind to an anti-apoptotic protein.
- the polypeptide can bind to a pro-apoptotic protein.
- the polypeptide can bind and activate BAX or BAK.
- the polypeptide binds to a BH1, BH2 and/or BH3 domain.
- the polypeptide activates cell death, for example the polypeptide can trigger cytochrome c release and activate mitochondrial cell death.
- the polypeptide can inhibit cell death.
- the polypeptide includes a BH3 domain.
- x is 2, 3, or 6.
- each y is independently an integer between 3 and 15.
- each y is independently an integer between 1 and 15.
- Ri and R 2 are each independently H or C ⁇ -C 6 alkyl. In some instances, Ri and R 2 are each independently C1-G 3 alkyl. In some instances, at least one of Ri and R 2 are methyl. For example Ri and R 2 are both methyl.
- R 3 is alkyl (e.g., C 8 alkyl) and x is 3. In some instances, R 3 is Cn alkyl and x is 6. In some instances, R 3 is alkenyl (e.g., C 8 alkenyl) and x is 3. In some instances x is 6 and R 3 is Cn alkenyl.
- formula I is depicted as
- the C and C" disubstituted stereocenters can both be in the R configuration or they can both be in the S configuration, for example when X is 3.
- X is 3.
- the C disubstituted stereocenter is in the R configuration and the C" disubstituted stereocenter is in the S configuration.
- the R 3 double bond may be in the E or Z stereochemical configuration.
- R 3 is [R ⁇ K-R-J n ; and Rt is a straight chain alkyl, alkenyl, or alkynyl.
- the polypeptide includes an amino acid sequence which is at least about 60% (70%, 80%, 85%, 90%, 95% or 98%) identical to the amino acid sequence of EDI1RNI*RHL*QVGDSN L DRSIW (SEQ DD NO: 112), wherein * is a tethered amino acid.
- * is a tethered amino acid.
- the tether can include an alkyl, alkenyl, or alkynyl moiety (e.g., C 5 , C 8 or Cn alkyl or a C 5 , C 8 or C alkenyl, or C 5 , C 8 or Cn alkynyl).
- the tethered amino acid can be alpha disubstituted (e.g., C1-C 3 or methyl).
- the polypeptide can include an amino acid sequence which is at least about 60% (70%, 80%, 85%, 90%, 95% or 98%) identical to the amino acid sequence of EDIRNIARHLA*VGD*N L DRS ⁇ W (SEQ ID NO: 110), wherein * is a tethered amino acid.
- the polypeptide is transported through the cell membrane (e.g., through an active transport or endocytotic mechanism or by passive transport).
- the polypeptide does not include a Cys or Met. In some embodiments the polypeptide comprises at least 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 50, or more contiguous amino acids of a BCL-2 or BCL-2 like domain, e.g., a BH3 domain or BH3-like domain, e.g., a polypeptide depicted in any of FIGs. 5a, 5b, and 28a-28h.
- Each [Xaa] y is a peptide that can independently comprise at least 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, , 20, 25 or more contiguous amino acids of a BCL-2 or BCL-2 like domain, e.g., a BH3 domain or BH3-like domain, e.g., a polypeptide depicted in any of FIGs. 5a, 5b, and 28a-28h.
- [Xaa] x is a peptide that can comprise 3 or 6 contiguous amino acids of acids of a BCL-2 or BCL-2 like domain, e.g., a BH3 domain or BH3-like domain, e.g., a polypeptide depicted in any of FIGs.
- the polypeptide can comprise 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 35, 40, 45, 50 contiguous amino acids of acids of a BCL-2 or BCL-2 like domain, e.g., a BH3 domain or BH3-like domain, e.g., a polypeptide depicted in any of FIGs. 5a, 5b, and 28a-28h (SEQ ID Nos: ) wherein two amino acids that are separated by three amino acids (or six amino acids) are replaced by amino acid substitutes that are linked via R 3 . Thus, at least two amino acids can be replaced by tethered amino acids or tethered amino acid substitutes.
- formula I is depicted as
- [Xaa] y - and [Xaa] y - can each comprise contiguous polypeptide sequences from the same or different BCL-2 or BCL-2 like domains.
- the invention features cross-linked polypeptides comprising 10 (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 35, 40, 45, 50 or more) contiguous amino acids of a BCL-2 or BCL-2 like domain, e.g., a BH3 domain or BH3-like domain, e.g., a polypeptide depicted in any of FIGs.
- polypeptide has apoptotic activity.
- polypeptide also includes a fluorescent moiety or radioisotope.
- the polypeptide includes 23 amino acids; Ri and R 2 are methyl; R 3 is C 8 alkyl, Cn alkyl, C 8 alkenyl, Cn alkenyl, C 8 alkynyl, or C ⁇ alkynyl; and x is 2, 3, or 6.
- the polypeptide includes an affinity label, a targeting moiety, and/or a biotin moiety.
- the polypeptide is a polypeptide selected from the group consisting of the polypeptides depicted in and of HGs. 28a-h (SEQ ID NOS: 1-83) and 5a-b (SEQ ID NOS: 84-114).
- the invention features a method of making a polypeptide of formula > (HJ), including providing a polypeptide of formula (II); and
- each Ri and R 2 are independently H, alkyl, alkenyl, alkynyl, arylalkyl, cycloalkylalkyl; heteroarylalkyl; or heterocyclylalkyl; each n is independently an integer from 1-15; x. is 2, 3, or 6 each y is independently an integer from 0-100; z is an integer from 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10); and each Xaa is independently an amino acid;
- the polypeptide binds to a BCL-2 family member protein.
- the catalyst is a ruthenium catalyst.
- the method also includes providing a reducing or oxidizing agent subsequent to the ring closing metathesis.
- the reducing agent is H 2 or the oxidizing agent is osmium tetroxide
- the invention features a method of treating a subject including administering to the subject any of the compounds described herein.
- the method also includes administering an additional therapeutic agent.
- the invention features a method of treating cancer in a subject including administering to the subject any of the compounds described herein.
- the method also includes administering an additional therapeutic agent.
- the invention features a library of the compounds described herein.
- the invention features a method of identifying a candidate compound for the promotion of apoptosis, including; providing mitochondria; contacting the mitochondria with any of the compounds described herein; measuring cytochrome c release; and comparing the cytochrome c release in the presence of the compound to the cytochrome c release in the absence of the compound, wherein an increase in cytochrome c release in the presence of the compound of formula 1 identifies the compound as a candidate compound for the promotion of apoptosis.
- the invention features a polypeptide of the formula (IV), .
- each Ri and R 2 are independently H, alkyl, alkenyl, alkynyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocyclyl alkyl;
- R 3 is alkyl, alkenyl, alkynyl; [R 4 -K-R 4 ] n or a naturally occurring amino acid side chain; each of which is substituted with 0-6 R 5 ;
- R 4 is alkyl, alkenyl, or alkynyl;
- R 5 is halo, alkyl, OR 6 , N(R 6 ) 2 , SR 6 , SOR 6 , SO 2 R 6 , CO 2 R 6 , R 6 , a fluorescent moiety, or a radioisotope;
- ⁇ P K is O, S, SO, SO 2 , CO, CO 2 , CONR 6 , or ⁇ ;
- R 6 is H, alkyl, or a therapeutic agent;
- each Ri and R 2 are independently H, alkyl, alkenyl, alkynyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocyclylalkyl;
- R 3 is alkyl, alkenyl, alkynyl; [R 4 -K-R ] n ; each of which is substituted with 0-6 R 5 ;
- R is alkyl, alkynyl, or alkynyl;
- R 5 is halo, alkyl, OR 6 , N(R 6 ) 2 , SR 6 , SOR 6 , SO 2 R 6 , CO 2 R 6 , R 6 , a fluorescent moiety, or a radioisotope;
- p K is O, S, SO, SO 2 , CO, CO 2 , CONR 6 , or R 6 is H, alkyl, or a therapeutic agent;
- n is an integer from 1-4;
- x is an integer
- polypeptide has at least 15%, at least 35%, at least 50%, at least 60%, at least 70%, at least 80% or at least 90% alpha helicity as determined by circular dichroism.
- the invention features a polypeptide of formula (I),
- each Ri and R 2 are independently H, alkyl, alkenyl, alkynyl, arylalkyl, cycloalkylalkyl, heteroaryl alkyl, or heterocyclylalkyl;
- R 3 is alkyl, alkenyl, alkynyl; [R 4 -K-R 4 ] n ; each of which is substituted with 0-6 R 5 ;
- R 4 is alkyl, alkynyl, or alkynyl;
- R 5 is halo, alkyl, OR 6 , N(R 6 ) 2 , SR 6 , SOR 6 , SO 2 R 6 , CO 2 R 6 , R 6 , a fluorescent moiety, or a radioisotope;
- K is O, S, SO, SO 2 , CO, CO 2 , CONR 6 , or R 6 is H, alkyl, or a therapeutic agent; n is an integer from 1-4; x is an integer from 2-10; each y is independently an integer from 0-100; z is an integer from 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10); and each Xaa is independently an amino acid; wherein the polypeptide has at least a 1.25-fold increase in alpha helicity as determined by circular dichroism compared to the polypeptide of formula (IV)
- the polypeptide has at least a 1.5-fold, at least 1.75 fold, at least 2:0- fold, at least 2.5-fold, at least 3-fold, or at least 4-fold increase in alpha helicity as determined by circular dichroism compared to the polypeptide of formula (IV).
- the invention features a method of identifying a candidate compound for the inhibition of apoptosis, including; providing mitochondria; contacting the mitochondria with a compound described herein; measuring cytochrome c release; and comparing the cytochrome c release in the presence the compound described herein to the cytochrome c release in the absence of the compound described herein, wherein a decrease in cytochrome c release in the presence of the compound described herein identifies the compound described herein as a candidate compound for the inhibition of apoptosis.
- Combinations of substituents and variables envisioned by this invention are only those that result in the formation of stable compounds.
- stable refers to compounds which possess stability sufficient to allow manufacture and which maintains the integrity of the compound for a sufficient period of time to be useful for the purposes detailed herein (e.g., therapeutic administration to a subject or generation of reagents to study or discover a biological pathway either in vitro or in vivo).
- the compounds of this invention may contain one or more asymmetric centers and thus occur as racemates and racemic mixtures, single enantiomers, individual diastereomers and diastereomeric mixtures. All such isomeric forms of these compounds are expressly included in the present invention.
- the compounds of this invention may also be represented in multiple tautomeric forms, in such instances, the invention expressly includes all tautomeric forms of the compounds described herein (e.g., alkylation of a ring system may result in alkylation at multiple sites, the invention expressly includes all such reaction products). All such isomeric forms of such compounds are expressly included in the present invention. All crystal forms of the compounds described herein are expressly included in the present invention.
- amino acid refers to a molecule containing both an amino group and a carboxyl group.
- Suitable amino acids include, without limitation, both the D- and L- isomers of the 20 common naturally occurring amino acids found in peptides (e.g., A, R, N, C, D, Q, E, G, H, I, L, K, M, F, P, S, T, W, Y, V (as known by the one letter abbreviations)) as well as the naturally occuring and unnaturally occurring amino acids prepared by organic synthesis or other metabolic routes.
- a "non-essential" amino acid residue is a residue that can be altered from the wild-type sequence of a polypeptide (e.g., a BH3 domain) without abolishing or substantially altering its activity.
- amino acid residues having similar side chains are a residue that, when altered from the wild-type sequence of the polypeptide, results in abolishing or substantially abolishing the polypeptide activity.
- a “conservative amino acid substitution” is one in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art.
- amino acids with basic side chains e.g., lysine, arginine, histidine
- acidic side chains e.g., aspartic acid, glutamic acid
- uncharged polar side chains e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine
- nonpolar side chains e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan
- beta-branched side chains e.g., threonine, valine, isoleucine
- aromatic side chains e.g., tyrosine, phenylalanine, tryptophan, histidine
- a predicted nonessential amino acid residue in a BH3 polypeptide is preferably replaced with another amino acid residue from the same side chain family.
- the symbol " ⁇ ' "when used as part of a molecular structure refers to a single bond or a trans or cis double bond.
- amino acid side chain refers to a moiety attached to the ⁇ -carbon in an amino acids.
- the amino acid side chain for alanine is methyl
- the amino acid side chain for phenylalanine is phenylmethyl
- the amino acid side chain for cysteine is thiomethyl
- the amino acid side chain for aspartate is carboxymethyl
- the amino acid side chain for tyrosine is 4- hydroxyphenylmethyl
- Other non-naturally occurring amino acid side chains are also included, for example, those that occur in nature (e.g., an amino acid metabolite) or those that are made synthetically (e.g., an alpha di-substituted amino acid).
- polypeptide encompasses two or more naturally occurring or synthetic amino acids linked by a covalent bond (e.g., a amide bond).
- Polypeptides as described herein include full length proteins (e.g., fully processed proteins) as well as shorter amino acids sequences (e.g., fragments of naturally occurring proteins or synthetic polypeptide fragments).
- halo refers to any radical of fluorine, chlorine, bromine or iodine.
- alkyl refers to a hydrocarbon chain that may be a straight chain or branched chain, containing the indicated number of carbon atoms. For example, C1-C1 0 indicates that the group may have from 1 to 10 (inclusive) carbon atoms in it. In the absence of any numerical designation, “alkyl” is a chain (straight or branched) having 1 to 20 (inclusive) carbon atoms in it.
- alkylene refers to a divalent alkyl (i.e., -R-).
- alkenyl refers to a hydrocarbon chain that may be a straight chain or branched chain having one or more carbon-carbon double bonds. The alkenyl moiety contains the indicated number of carbon atoms. For example, C 2 -C 10 indicates that the group may have from 2 to 10 (inclusive) carbon atoms in it.
- lower alkenyl refers to a C 2 -C 8 alkenyl chain. In the absence of any numerical designation, "alkenyl” is a chain (straight or branched) having 2 to 20 (inclusive) carbon atoms in it.
- alkynyl refers to a hydrocarbon chain that may be a straight chain or branched chain having one or more carbon-carbon triple bonds.
- the alkynyl moiety contains the indicated number of carbon atoms.
- C 2 -C 10 indicates that the group may have from 2 to 10 (inclusive) carbon atoms in it.
- lower alkynyl refers to a C 2 -C 8 alkynyl chain.
- alkynyl is a chain (straight or branched) having 2 to 20 (inclusive) carbon atoms in it.
- aryl refers to a 6-carbon monocyclic or 10-carbon bicyclic aromatic ring system wherein 0, 1 , 2, 3, or 4 atoms of each ring may be substituted by a substituent. Examples of aryl groups include phenyl, naphthyl and the like.
- arylalkyl or the term “aralkyl” refers to alkyl substituted with an aryl.
- arylalkoxy refers to an alkoxy substituted with aryl.
- cycloalkyl as employed herein includes saturated and partially unsaturated cyclic hydrocarbon groups having 3 to 12 carbons, preferably 3 to 8 carbons, and more preferably 3 to 6 carbons, wherein the cycloalkyl group additionally may be optionally substituted.
- Preferred cycloalkyl groups include, without limitation, cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptyl, and cyclooctyl.
- heteroaryl refers to an aromatic 5-8 membered monocyclic, 8-12 membered bicyclic, or 11-14 membered tricyclic ring system having 1-3 heteroatoms if monocyclic, 1-6 heteroatoms if bicyclic, or 1-9 heteroatoms if tricyclic, said heteroatoms selected from O, N, or S (e.g., carbon atoms and 1-3, 1-6, or 1-9 heteroatoms of N, O, or S if monocyclic, bicyclic, or tricyclic, respectively), wherein 0, 1, 2, 3, or 4 atoms of each ring may be substituted by a substituent.
- heteroaryl groups include pyridyl, furyl or furanyl, imidazolyl, benzimidazolyl, pyrimidinyl, thiophenyl or thienyl, quinolinyl, indolyl, thiazolyl, and the like.
- heteroarylalkyl or the term “heteroaralkyl” refers to an alkyl substituted with a heteroaryl.
- heteroarylalkoxy refers to an alkoxy substituted with heteroaryl.
- heterocyclyl refers to a nonaromatic 5-8 membered monocyclic, 8-12 membered bicyclic, or 11-14 membered tricyclic ring system having 1-3 heteroatoms if monocyclic, 1-6 heteroatoms if bicyclic, or 1-9 heteroatoms if tricyclic, said heteroatoms selected from O, N, or S (e.g., carbon atoms and 1-3, 1-6, or 1-9 heteroatoms of N, O, or S if monocyclic, bicyclic, or tricyclic, respectively), wherein 0, 1, 2 or 3 atoms of each ring may be substituted by a substituent.
- heterocyclyl groups include piperazinyl, pyrrolidinyl, dioxanyl, morpholinyl, tetrahydrofuranyl, and the like.
- substituted refers to a group “substituted” on an alkyl, cycloalkyl, aryl, heterocyclyl, or heteroaryl group at any atom of that group.
- Suitable substituents include, without limitation, halo, hydroxy, mercapto, oxo, nitro, haloalkyl, alkyl, alkaryl, aryl, aralkyl, alkoxy, thioalkoxy, aryloxy, amino, alkoxycarbonyl, amido, carboxy, alkanesulfonyl, alkylcarbonyl, and cyano groups.
- FIG. 1 depicts BCL-2 family members having one or more conserved BCL-2 homology (BH) domains.
- FIG. 2 depicts a model of BID-mediated mitochondrial apoptosis. TNF-RI/Fas induces cleavage of BID, which translocates to the mitochondria and trigger apoptosis.
- FIG. 3 depicts a synthetic strategy for the generation of chiral ⁇ , ⁇ -disubstituted non- natural amino acids containing olefinic side chains.
- FIG. 4a depicts chemical structures of certain non-natural amino acids.
- FIG. 4b depicts the crosslinking of synthetic amino acids at positions i and i+4 and i and i+7 by olefin metathesis.
- FIG. 5 a depicts SAHB3 compounds generated by non-natural amino acid substitution and olefin metathesis (SEQ ID NOs 84-108, respectively).
- FIG. 5b depicts certain crosslinked peptides used in the studies described herein (SEQ ID NOs 109-114, respectively).
- FIG. 6 depicts the results of a study showing the degree of ⁇ -helicity of BH3 domains of selected BCL-2 family members.
- FIG. 7 depicts the results of a study showing that chemical crosslinking enhances the alpha helicity of SAHB3 BID compounds compared to the unmodified BID BH3 peptide.
- FIG. 8 depicts the results of a study showing that a gly ⁇ glu mutant of SAHB3 BID A polypeptide displays similar helical contact to the corresponding gly containing polypeptide.
- FIG. 9 depicts the results of a study showing that truncation of the 23-mer SABH3 B!D B ("SAHB3b") to a 16-mer results in loss of ⁇ -helicity.
- SAHB3b 23-mer SABH3 B!D B
- FIG. 10a depicts the results of a study showing that the kinetics of in vitro trypsin proteolysis is retarded 3.5-fold by the SABH3 BID A crosslink.
- FIG. 10b depicts the results of a study of ex vivo serum stability of peptides, demonstrating a 10-fold increase in half -life of the cross-linked peptide compared to the unmodified peptide.
- FIG 10c depicts the results of an in vivo study showing that SAHB3 B I D A 1S maintained at higher serum concentrations over time compared to BID BH3 peptide.
- FIG. 11a depicts the results of a study showing that SAHB3 B I D peptides display high affinity binding to GST-BCL2 in a fluorescence polarization competitive binding assay.
- FIG. lib depicts the results of a study showing that the negative control Gly to Glu point mutants of SAHB3 BI DA and B are relatively poor binders.
- FIG. lid depicts the results of a BCL-2 fluorescence polarization direct binding assay demonstrating a more than 6-fold enhancement in binding affinity of S AHB3 BID A compared to unmodified BID BH3.
- FIG lie depicts the results of a BAX fluorescence polarization direct binding assay demonstrating that incorporation of a crosslink results in measurable binding of SAHB3 BID A and S AHB3 BID(G ⁇ E)A to a multidomain pro-apoptotic BCL-2 family member.
- the unmodified BID BH3 peptide shows no binding.
- FIG. llf depicts HSQC spectra that demonstrate a conformational change in 15 N-labeled BCL-X L upon SAHB3 B J D A binding, which is similar to that seen upon BID BH3 binding, confirming that SAHB3 BID A binds to the defined hydrophobic pocket of BCL-X L .
- FIG. 12a and 12b depict the results of studies showing the percent of cytochrome c released by SAHB3 B ⁇ D compounds from purified mouse liver mitochondria.
- FIGs. 13a and 13b depict the results of a study showing that SAHB3 B ⁇ >A- and SAHB3 BID B- induced cytochrome c release is faster and more potent than that of unmodified peptide.
- FIG. 14 depicts the results of a study showing that the Gly to Glu mutation of SAHB3 BH )A selectively eliminates Bak-dependent cytochrome release, underscoring the specificity of action of S AHB3 B ioA-induced cytochrome c release shown in FIG. 13.
- FIG. 13a and 13b depict the results of studies showing the percent of cytochrome c released by SAHB3 B ⁇ D compounds from purified mouse liver mitochondria.
- FIGs. 13a and 13b depict the results of a study showing that SAHB3 B ⁇ >A- and SAHB3 BID B- induced
- FIG. 15 depicts the results of a study showing that Jurkat T-cell leukemia cells, upon exposure to FITC-BID BH3 and FITC-BID helix 6, lack fluorescent labeling whereas Jurkat T- cell leukemia cells, upon exposure to FITC-SAHB3 BID demonstrate a positive FITC signal, and that these results are not significantly altered by trypsin-treatment of the cells.
- FIG. 15 depicts the results of a study showing that Jurkat T-cell leukemia cells, upon exposure to FITC-BID BH3 and FITC-BID helix 6, lack fluorescent labeling whereas Jurkat T- cell leukemia cells, upon exposure to FITC-SAHB3 BID demonstrate a positive FITC signal, and that these results are not significantly altered by trypsin-treatment of the cells.
- FIG. 16a depicts the results of a study showing that Jurkat T- cells exposed to cross-linked peptides FITC-SAHB3BI D A and SAHB3 BID ( G ⁇ B)A demonstrated fluorescent labeling, whereas Jurkat T- cells exposed to unmodified BH3 peptides FITC-BID and FITC-BID (G ⁇ s ) did not.
- FIG 16b depicts the results of a study showing that cellular import of FITC-S AHB3 BID A is time-dependent at 37 °C, as assessed by FACS analysis.
- FIGs. 17a and 17b depict the results of a study showing Jurkat T- cells treated with FITC- peptides at 4 °C and 37 °C.
- FIG. 17a shows that FITC-BID BH3 did not label the cells at either temperature, and FITC-S AHB3 B I D A labeled the cells at 37 °C but not 4 °C.
- FIG. 17b shows that FITC-BID helix 6 labels but also permeabilizes the cells in a temperature-independent manner.
- FITC-SAHB3 BID A only labels the cells at 37 °C and does so without cellular permeabilization, consistent with active transport of SAHB3 BID A via an endocytic pathway.
- 17c depicts the results of a study showing that Jurkat T- cells, when preincubated with or without sodium azide and 2-deoxyglucose followed by treatment with FITC-peptides, showed no labeling for either condition with the FITC-BID BH3 polypeptide.
- the cells showed reduced labeling for FITC-SAHB3 BID A under sodium azide and 2-deoxyglucose conditions, and showed labeling with FITC-BID helix 6 under both conditions.
- FIG 18 depicts the results of a study showing that FITC-S AHB3 BID A uptake is not inhibited by cellular treatment with the glycosaminoglycan heparin, indicating that there are distinctions between the mechanism of binding and uptake of FITC-SAHB3 BID A compared to other cell penetrating peptides (CPPs), such as HIV TAT and Antennapedia peptides.
- FIG. 19 depicts the results of a study showing that FITC-SAHB3 BID A compounds display cytoplasmic labeling with a vesicular distribution in Jurkat T-cells, whereas plasma membrane fluorescence is not evident.
- FIG. 20 depicts the results of a study showing that FITC-S AHB3 BID A co-localizes with a mitochondrial membrane marker in Jurkat T-cells.
- FIG 21a and FIG 21b depicts the results of a study showing that FITC-SAHB3 B IDA colocalizes in live BCL-2 overexpressing Jurkat T-cells with dextran-labeled endosomes but not transferring-labeled endosomes, indicating that FITC-S AHB3 BID A is imported into cells by fluid- phase pinocytosis.
- FIG 21c depicts the results of a study showing that by 24 hours after treatment, FITC- SAHB3 BID A colocalizes in the live cells with mitochondria labeled by MitoTracker.
- FIGs. 22a, 22b, and 22c depict the results of a study showing that SAHB3 BED A triggers metabolic arrest in a dose responsive fashion in the leukemia cell lines tested, whereas BID BH3 and SAHB3 BID ( G ⁇ E) A had essentially no effect in this dose range.
- FIG. 23 depicts the results of a study showing that SAHB3 B roA and SAHB3 BJD B induced apoptosis in up to 50% of intact Jurkat cells at 10 ⁇ M, an effect specifically inhibited by BCL-2 overexpression (black bars).
- FIG. 24 depicts the results of a study showing the dose response of Jurkat BCL-2 overexpressing cells treated with SAHB3 B IDA , SAHB3 B ID(G ⁇ E ) and SAHB3 Bro(G ⁇ s)A. Whereas S AHB3 B1D A and SAHB3 B1D(G ⁇ S )A can overcome BCL-2 inhibition of apoptosis in this dose range, the gly to glu point mutant has not effect.
- FIG. 24 depicts the results of a study showing the dose response of Jurkat BCL-2 overexpressing cells treated with SAHB3 B IDA , SAHB3 B ID(G ⁇ E ) and SAHB3 Bro(G ⁇ s)A. Whereas S AHB3 B1D A and SAHB3 B1D(G ⁇ S )A can overcome BCL-2 inhibition of apoptosis in this dose range, the gly to glu point mutant has not effect.
- FIG. 24 depicts the results of a study showing the dose response of Jurkat BCL
- FIG. 25 depicts the results of a study showing that SAHB3 B1D A treated leukemia cell lines REH, MV4;11, and SEMK2 underwent specific apoptosis induction, whereas the gly to glu point mutant SAHB3 B1D(G ⁇ E) A had no effect on the cells.
- FIG. 27b depicts the results of a study showing that SAHB3 B1D A blunts the progression of SEMK2 leukemia relative to vehicle in NOD-SCID mice.
- a dose responsive effect is noted in FIG 27a.
- FIGs. 27c, 27d, 27e depict the results of an animal study showing that SAHB3 BID A inhibits the growth of RS4;11 leukemia relative to vehicle in SCID beige mice, with statistically significant prolongation of survival in SAHB3 B ir>A-treated mice compared to vehicle controls.
- FIG 27f depicts the results of an animal study again showing that SAHB3 B1D A causes regression of RS4;11 leukemia in SCID beige mice, in contrast with SAHB3 BI D (G->E) A- and vehicle-treated mice which demonstrate leukemia progression.
- the invention is based, in part, on the discovery that cross-linked alpha helical domain polypeptides of BCL-2 family proteins have improved pharmacological properties over their uncrosslinked counterparts (e.g., increased hydrophobicity, resistance to proteolytic cleavage, binding affinity, in vitro and in vivo biological activity). Moreover, it has been surprisingly discovered that the cross-linked polypeptides can penetrate the cell membrane via a temperature- and energy-dependent transport mechanism (e.g., endocytosis, specifically fluid-phase pinocytosis).
- the polypeptides include a tether between two non-natural amino acids, which tether significantly enhances the alpha helical secondary structure of the polypeptide.
- the tether extends across the length of one or two helical turns (i.e., about 3.4 or about 7 amino acids). Accordingly, amino acids positioned at i and i+3; i and i+4; or i and i+7 are ideal candidates for chemical modification and crosslinking.
- amino acids positioned at i and i+3; i and i+4; or i and i+7 are ideal candidates for chemical modification and crosslinking.
- a peptide has the sequence ...Xaa 1; Xaa 2 , Xaa 3 , Xaa 4 , Xaas, Xaa 6 , Xaa 7 , Xaa 8 , Xaa ..., crosslinks between Xaa ! andXaa ⁇ or between Xaa] and Xaa 5 , or between Xaa !
- Xaa 2 andXaas are useful as are crosslinks between Xaa 2 andXaas, or between Xaa 2 and Xaa , or between Xaa 2 andXaa , etc.
- a model polypeptide was prepared incorporating two sets of crosslinks with one located between Xaa ! and Xaa 5 and another between Xaa and Xaa 13 .
- the double crosslink was achieved by careful stereochemical control of the double bond metathesis reactions.
- the invention encompasses the incorporation of more than one crosslink within the polypeptide sequence to either further stabilize the sequence or facilitate the stabilization of longer polypeptide stretches.
- independently synthesized crosslinked peptides can be conjoined by a technique called native chemical ligation (Bang, et al., J. Am. Chem Soc. 126:1377).
- the novel cross-linked polypeptides are useful, for example, to mimic or study proteins or polypeptides having one or more alpha-helical domains.
- One family of proteins where family members have at least one alpha helical domain is the BCL-2 family of proteins. These proteins are involved in cellular apoptotic pathways. Some BCL-2 family members have a pro-apoptotic function, others have an anti-apoptotic function, and still others change functions with a change in cellular conditions.
- SAHB3BI D compounds were generated by solid phase peptide synthesis followed by olefin metathesis-based crosslinking of the synthetic amino acids via their olefin-containing side chains.
- S AHB3 BID compounds generated are illustrated in FIG. 5a.
- the amino termini of selected compounds were further derivatized with b-alanine and fluorescein isothiocyanate (FITC [Sigma] DMF/DJEA) to generate fluorescently labeled compounds.
- FITC fluorescein isothiocyanate
- a C-terminal tryptophan was incorporated to serve as a UV label for purification and concentration determination purposes; SAHBA compounds were also synthesized without the C-terminal tryptophan and N-terminal glutamic acid, the latter modification performed to increase the overall pi of the molecules.
- FIG. 5b schematically depicts a subset of the peptides in FIG. 5 a, including the stereochemistry of the olefinic amino acids (R and S enantiomers of the 5-carbon olefinic amino acid and the S enantiomer of the 8-carbon olefinic amino acid).
- the a-helical content of each peptide was calculated by dividing the mean residue ellipticity [ ⁇ ]222obs by the reported [ ⁇ ]222obs for a model helical decapeptide (Yang et al. 1986 Methods Enzymol. 130:208)).
- the chemical crosslink(s) increased the percent ⁇ -helicity of BJD's BH3 domain, with SAHB3B]DA and B achieving more than 5-fold enhancement (FIG. 7).
- SAHB3 BI D (G->E) A a negative control Gly to Glu point mutant of S AHB3 B IDA, displays similar helical content to SAHB3B ⁇ >A (FIG. 8).
- the all-hydrocarbon crosslink can transform an apoptotic peptide that is essentially a random coil in aqueous solution into one that is predominantly ⁇ -helical in structure.
- the importance of the fourth helical turn in stabilizing BID BH3 peptides is underscored by the decrease in helicity observed when the SAHB3 BID B 23-mer is truncated to the 16-mer, SAHB3 B iD(tr)B (FIG. 9).
- the All-Hydrocarbon Crosslink Increases Protease Resistance ofSAHB3 BW Compounds
- the amide bond of the peptide backbone is susceptible to hydrolysis by proteases, thereby rendering peptidic compounds vulnerable to rapid degradation in vivo. Peptide helix formation, however, buries the amide backbone and therefore shields it from proteolytic cleavage.
- SAHB3 BI DA was subjected to in vitro trypsin proteolysis to assess for any change in degradation rate compared to the unmodified BJD BH3 peptide.
- SAHB3 BID A and unmodified peptide were incubated with trypsin agarose and the reactions quenched at various time points by centrifugation and subsequent HPLC injection to quantitate the residual substrate by ultraviolet absorption at 280 nm.
- BJD BH3 and S AHB3 BID A compounds (5 meg) were incubated with trypsin agarose (Pierce) (S E -125) for 0, 10, 20, 90, and 180 minutes. Reactions were quenched by tabletop centrifugation at high speed; remaining substrate in the isolated supernatant was quantified by HPLC-based peak detection at 220 nm.
- enhanced protection of trypsin-sensitive amide bonds by burying them at the core of the ⁇ -helix affords a more stable peptidic compound, and may therefore render such compounds particularly stable in serum.
- FITC-conjugated peptides BJD BH3 and SAHB3 BrD A (2.5 meg) were incubated with fresh mouse serum (20 mL) at 37°C for 0, 1, 2, 4, 8, and 24 hours.
- the level of intact FITC-compound was determined by flash freezing the serum specimens in liquid nitrogen, lyophilization, extraction in 50:50 acetonitrile/water containing 0.1% trifluoroacetic acid, followed by HPLC -based quantitation using fluorescence detection at excitation/emission settings of 495/530 nm. The results of this analysis are shown in FIG. 10b.
- SAHB3 BI D Compounds Retain High Affinity Anti-Apoptotic Binding
- the all-hydrocarbon crosslinks were selectively placed on the charged face of the BID BH3 amphipathic helix in order to avoid interference with critical interactions between the binding pocket of multidomain apoptotic proteins and the hydrophobic residues of the BID BH3 helix.
- Fluorescence polarization competitive binding experiments were performed to evaluate the efficacy of SAHB3 B T D compounds in competing with FITC-labeled unmodified BID BH3 peptide for GST-BCL-2 binding.
- FITC-labeled BID BH3 peptide binds to BCL-2 with a K D of 220 nM, and once bound, displacement of this interaction by unlabeled BID BH3 occurrs at an IC50 of 838 nM.
- the BAD BH3 domain has an enhanced K D of 41 nM for BCL-2 binding, and that it can displace prebound FITC-BJD BH3 with an IC 50 of 173 nM.
- Direct binding assays by fluorescence polarization demonstrated that incorporation of the crosslink into BJD BH3 peptide resulted in enhanced binding affinity of S AHB3 B1D A for both BCL-2, an anti-apoptotic multidomain protein, and BAX, a pro-apoptotic multidomain protein, compared to unmodified BJD BH3 peptide (FIGs lid and lie).
- a direct BCL-2 fluorescence polarization binding assay demonstrated a 6-fold enhancement in BCL-2 binding affinity of SAHB3 BID A (K D , 38.8 nm) compared to unmodified BID BH3 peptide (K D , 269 nM) (FIG lid).
- a Gly to Glu mutation SAHBA( G ⁇ E) (K D , 483 nM), eliminates high affinity binding and serves as a useful control (FIG. lid).
- Escherichia coli BL21 (DE3) containing the plasmid encoding C-terminal deleted GST-BCL-2 were cultured in ampicillin-containing Luria Broth and induced with 0.1 mM JPTG.
- the bacterial pellets were resuspended in lysis buffer (1 mg/ml lysozyme, 1% Triton X-100, 0.1 mg/ml PMSF, 2 ⁇ g/ml aprotinin, 2 ⁇ g/ml leupeptine, 1 ⁇ g/ml pepstatin A in PBS) and sonicated. After centrifugation at 20,000 x g for 20 min, the supernatant was applied to a column of glutathione-agarose beads (Sigma).
- the beads were washed with PBS and treated with 50 mM glutathione, 50 mM Tris-HCl (pH 8.0) to elute the protein, which was then dialyzed against binding assay buffer (140 mM NaCl, 50 mM Tris-HCl [pH 7.4]). Fluorescinated compounds (25 nM) were incubated with GST-BCL2 (25 nM-1000nM) in binding buffer at room temperature. Binding activity was measured by fluorescence polarization on a Perkin-Elmer LS50B luminescence spectrophotometer. KD values were determined by nonlinear regression analysis using Prism software (Graphpad). Full-length BAX protein was prepared as previously described (Suzuki et al, Cell, 103:645) and fluorescence polarization assay performed as described above.
- SAHB3 B Binds to BCL-X L
- a two-dimensional N/1H heteronuclear single-quantum correlation (HSQC) spectrum of 15 N-labeled BCL-XL before and after the addition of SAHB3B I DA was recorded and compared with the corresponding BJD BH3/ 15 N-BCL-X L spectrum.
- HSQC heteronuclear single-quantum correlation
- Escherichia coli BL21 (DE3) containing the plasmid encoding C-terminal deleted BCL-X L were cultured in M9-minimal medium containing 15 NH 4 .C1 (Cambridge Isotope Laboratories) to generate uniformly N-labeled protein. Recombinant proteins were isolated from bacteria. Unlabeled SAHB3 B I D A and BID BH3 peptides were generated and purified as described above.
- SAHB3 BID Compounds Trigger Rapid and Specific Release of Mitochondrial Cytochrome C
- cytochrome c release assays were performed using purified mouse liver mitochondria. Mitochondria (0.5 mg/mL) were incubated for 40 minutes with 1 ⁇ M and 100 nM of SAHB3 BID compounds and then supernatants and mitochondrial fractions isolated and subjected to cytochrome c ELISA assay. Background cytochrome c release (10-15%) was subtracted from total release for each sample, and the percent actual cytochrome c release was determined (FIG. 12).
- BAK-independent cytochrome c release is observed at this dose with SAHB3 BID A, B, and, in particular, D. Whereas this cytochrome c release may represent a nonspecific membrane perturbing effect of the ⁇ -helices, the role of a SAHB3B ⁇ rinduced, BAK-independent component of cytochrome c release is worthy of further exploration.
- SAHB3 BID compound that induces the most significant level of BAK-independent cytochrome c release SAHB3 B ⁇ >D
- SAHB3 BID D elutes from the reverse phase C18 column at 95% acetonitrile/5% water, compared to the other SAHB3 BID compounds that elute at 50-75% acetonitrile.
- BJD mutants with defective BH3 domains can promote BAK-independent cytochrome c mobilization (Scorrano et al, Dev Cell, 2:55) , and the highly hydrophobic BID helix 6 has been implicated in this activity (L. Scorrano, S.J.
- SAHB3 BID D displays both BAK dependent and independent cytochrome c release by mimicking features of BJD helices 3 and 6.
- SAHB3 BID A and B retain selective BAK-dependent cytochrome c release activity (FIG. 12b).
- the potency of SAHB3 BID B compares favorably with maximally activated myristolated BJD protein, which releases approximately 65% cytochrome c under these conditions at doses of 30 nM.
- SAHB3 BID B The most active SAHB3 BID compounds, A and B, were subjected to further kinetic studies to determine if helical preorganization can trigger more rapid cytochrome c release compared to the unmodified peptide. Similar to the above experiment, mouse liver mitochondria from wild-type and Bak-I- mice were exposed to the compounds at various concentrations and assayed for cytochrome c release at 10 and 40 minute intervals. Whereas at 10 minutes the unmodified peptide causes less than 10% release at the highest dose tested (1 ⁇ M), SAHB3 BID B has an EC50 for release at this timepoint of just under 400 nM, with almost maximal cytochrome release at 1 ⁇ M (Fig 13a).
- SAHB3 BID A triggers significant cytochrome c release at the 10 minute time interval.
- the EC50 for cytochrome c release at 40 minutes is 2.9 ⁇ M for the unmodified peptide and 310 and 110 nM for SAHB3 B I D A and B, respectively (Fig 13b).
- SAHB3 BI DA and B display a 10-25 fold enhancement in cytochrome c release activity at the 40 minute time point.
- the BAK-dependent cytochrome c release increases over time, the BAK-independent release does not change between the 10 and 40 minute timepoints, suggesting that this distinct release occurs early and is maximally achieved within 10 minutes.
- the negative control Gly to Glu point mutant of SAHB3 B ⁇ DA, SAHB3 B ID(G ⁇ E )A generates only Bak- independent cytochrome c release, confirming that SAHB3 B IDA functions via the Bak-dependent mitochondrial apoptosis pathway (Fig 14).
- these cytochrome c release data indicate that SAHB3 B I D A and B are capable of specifically inducing BAK-dependent cytochrome c release with markedly enhanced potency and kinetics compared to the unmodified peptide.
- SAHB3 BID Compounds Penetrate Intact Cells Fluorescein-derivatized SAHB3 BID compounds, BID BH3 peptides, and a BID helix 6 peptide were incubated with Jurkat T-cell leukemia cells in culture for 4-24 hours and subsequently FACS sorted to determine percent labeling of leukemia cells. In order to avoid confounding results from cell-surface bound compounds, the Jurkat cells were washed thoroughly and subjected to trypsin overdigestion, in accordance with recent reports. For each compound tested, there was no significant change in the FITC signal profile after trypsin digestion, suggesting that in the case of these peptides, little to no FITC-labeled compound is surface bound (FIG.
- FITC-SAHB3 BED A appears to enter the cell via endocytosis, a temperature- and energy-dependent transport pathway.
- Cellular import of FITC- SAHB3 BID A occurred in a time-dependent manner (FIG. 16b).
- FIG. 16b When cellular endocytosis was inhibited by performing the experiment at 4°C (FIG 17 a, 17b) or by treatment with the energy poisons sodium azide and 2-deoxyglucose (FIG 17c), cell labeling was inhibited or markedly diminished, respectively.
- FITC-SAHB3 BID A is propidium iodide (PI) negative, confirming that the crosslinked peptide does not merely function as a permeabilizing agent (Fig 17b); in contrast, FITC-BID helix 6 readily penetrates at both temperatures, effectively permeabilizing the cells, as evidenced by the degree of PI positivity (FIG. 17b).
- PI propidium iodide
- Jurkat T-cell leukemia cells were incubated with FJTC-labeled compounds as described above or with serum replacement at 4 hours followed by additional 16 hours incubation at 37°C, and after washing twice with PBS, were cytospun at 600 RPM for 5 minutes onto superfrost plus glass slides (Fisher). Cells were then fixed in 4% paraformaldehyde, washed with PBS, incubated with TO-PRO-3 iodide (100 nM) (Molecular Probes) to counterstain nuclei, treated with Vectashield mounting medium (Vector), and then imaged by confocal microscopy (BioRad 1024).
- double labeling experiments fixed cells were additionally incubated with primary antibody to TOM20, and rhodamine-conjugated secondary antibody prior to TOPRO-3 counterstaining.
- double labeling of Jurkat cells was performed with FITC-SAHB ⁇ (10 ⁇ M) and MitoTracker (100 nM, Molecular Probes), tetramethylrhodamine isothiocyanate (TRITC)-Dextran 4.4 kD or 70 kD (25 mcg/mL, Molecular Probes), or Alexa Fluor 594-transferrin (25 mcg/mL, Molecular Probes) for 4 hours (dextran and transferrrin) or 24 hours (MitoTracker).
- FITC-SAHB ⁇ 10 ⁇ M
- MitoTracker 100 nM, Molecular Probes
- TRITC tetramethylrhodamine isothiocyanate
- Alexa Fluor 594-transferrin 25 mcg/mL,
- BCL-2 overexpressing Jurkat cells were used for live confocal microscopy in order to optimize FITC imaging.
- FITC-SAHBA labeling of mitochondria was brighter in BCL-2 overexpressing Jurkats (consistent with the mechanism for SAHB activity), and thus image capture was facilitated using these cells.
- Treated Jurkats were washed twice and then resuspended in PBS and wet mount preparations analyzed with a BioRad 1024 (Beth Israel/Deaconess Center for Advanced Microscopy) or Zeiss LSM510 laser scanning confocal microscope (Children's Hospital Boston Imaging Core).
- SAHB3 B1D A compounds localized to the cytoplasmic rim of the leukemic cells, with no plasma membrane or surface fluorescence evident; the vesicular pattern of fluorescence suggested an organelle-specific localization (FIGs. 19a and 19b).
- Jurkat cells treated with FITC-BID BH3 showed no fluorescent labeling (FIG. 19c).
- FITC-SAHB3BiDA-treated cells display selective intracellular fluorescence and maintain their cellular architecture (FIG 19a)
- FITC-BID helix 6-treated cells are diffusely labeled and demonstrate disrupted cellular morphology (FIGs. 19d).
- SAHB3BW Compounds Trigger Apoptosis of B-, T-, and Mixed-Lineage Leukemia (MLL) Cells
- MTT assays using serial dilutions of SAHB3 BID A were performed on T-cell (Jurkat), B-cell (REH), and Mixed Lineage Leukemia (MLL)-cells (MV4;11, SEMK2, RS4;11) in culture.
- SAHB3 BID A inhibited the leukemic cells at IC 50 s of 2.2 (Jurkat), 10.2 (REH), 4.7 (MV4;11), 1.6 (SEMK2), and 2.7 (RS4;11) ⁇ M (FIG. 22a). Neither the BID BH3 peptide nor the SAHB A(G ⁇ E) point mutant had an effect in this dose range (FIG. 22b, 22c).
- SAHB3 BI ⁇ and SAHB3 B ID G ⁇ >S A demonstrate leukemic suppression in vivo NOD-SCJD mice were subjected to 300 cGy total body irradiation followed by intravenous injection of 4xl0 6 SEMK2-M1 leukemia cells exhibiting stable luciferase expression. The mice were monitored weekly for leukemia engraftment using the In Vivo Imaging System (IVIS, Xenogen), which quantitates total body luminescence after intraperitoneal injection of D-luciferin. On day 0, the leukemic mice were imaged and then treated intravenously with 10 mg/kg of SAHB3 BID A, SAHB3 BIDG --> S A, or no injection on days 1, 2, 3, 5, 6.
- IVIS In Vivo Imaging System
- Total body luminescence was measured on days 4 and 7.
- analysis of tumor burden among the groups demonstrates leukemic suppression by SAHB3 BID A and SAHB3 B i D(G - > s ) A compared to untreated control mice.
- FIG. 26b total body luminescence images demonstrate more advanced leukemia in the untreated group by day 7 (red density, representing high level leukemia, is seen throughout the skeletal system) compared to the SAHB3 B i D A-treated mice, which demonstrate lower level and more localized disease.
- the G ⁇ >S mutant which cannot be sequestered by BCL-2 appears to be more potent than the parent compound, SAHB3 B I D A, in suppressing leukemic growth.
- leukemic mice (generated as above) were imaged on day 0 and then treated intravenously with 10 mg/kg SAHB3 BID A, 5 mg/kg SAHB3 BID A, or vehicle control (5% DMSO in D5W) on days 1, 2, 3, 6, and 7. Total body luminescence was measured on days 4 and 8.
- SAHB3 BID A 10 mg/kg SAHB3 BID A, 5 mg/kg SAHB3 BID A, or vehicle control (5% DMSO in D5W) on days 1, 2, 3, 6, and 7.
- Total body luminescence was measured on days 4 and 8.
- FIG. 27a analysis of tumor burden among the groups demonstrates leukemic suppression by SAHB3 BID A in a dose-dependent manner compared to untreated control mice.
- Photonic emission was imaged (2 min exposure) using the In Vivo Imaging System (Xenogen) and total body bioluminescence quantified by integration of photonic flux (photons/sec) (Living Image Software, Xenogen).
- mice received a daily tail vein injection of SAHB3 BID A (10 mg/kg) or vehicle (5% DMSO in D5W) for seven days. Mice were imaged on days 1, 3, and 5 and survival monitored daily for the duration of the experiment.
- the survival distributions of SAHB3 B1D A and vehicle-treated mice were determined using the Kaplan-Meier method and compared using the log-rank test.
- mice were subjected to necropsy (Rodent Histopathology Core, DF/HCC). Control mice demonstrated progressive acceleration of leukemic growth as quantitated by increased bioluminescent flux from days 1-5 (FIG. 27c).
- SAHB3 BID A treatment suppressed the leukemic expansion after day 3, with tumor regression observed by day 5.
- Representative mouse images demonstrate the progressive leukemic infiltration of spleen and liver in mice, but regression of disease at these anatomical sites in SAHBA-treated mice by day 5 of treatment (FIG 27 d).
- a double bond of a hydrocarbon alkenyl tether (e.g., as synthesized using a ruthenium-catalyzed ring closing metathesis (RCM)) can be oxidized (e.g., via epoxidation or dihydroxylation) to provide one of compounds below.
- RCM ruthenium-catalyzed ring closing metathesis
- Either the epoxide moiety or one of the free hydroxyl moieties can be further functionalized.
- the epoxide can be treated with a nucleophile, which provides additional functionality that can be used, for example, to attach a tag (e.g., a radioisotope or fluorescent tag).
- the tag can be used to help direct the compound to a desired location in the body (e.g., directing the compound to the thyroid when using an Iodine tag) or track the location of the compound in the body.
- an additional therapeutic agent can be chemically attached to the functionalized tether (e.g., an anti-cancer agent such as rapamycin, vinblastine, taxol, etc.).
- S;uch derivitization can alternatively be achieved by synthetic manipulation of the amino or carboxy terminus of the polypeptide or via the amino acid side chain.
- hydrocarbon tethers have been described, other tethers are also envisioned.
- the tether can include one or more of an ether, thioether, ester, amine, or amide moiety.
- a naturally occurring amino acid side chain can be incorporated into the tether.
- a tether can be coupled with a functional group such as the hydroxyl in serine, the thiol in cysteine, the primary amine in lysine, the acid in aspartate or glutamate, or the amide in asparagine or glutamine. Accordingly, it is possible to create a tether using naturally occurring amino acids rather than using a tether that is made by coupling two non-naturally occurring amino acids. It is also possible to use a single non-naturally occurring amino acid together with a naturally occurring amino acid. It is further envisioned that the length of the tether can be varied.
- tethers spanning from amino acids i to i+3, i to i+4; and i to i+7 have been described in order to provide a tether that is primarily on a single face of the alpha helix, the tethers can be synthesized to span any combinations of numbers of amino acids.
- alpha disubstituted amino acids are used in the polypeptide to improve the stability of the alpha helical secondary structure.
- alpha disubstituted amino acids are not required, and instances using mono-alpha substituents (e.g., in the tethered amino acids) are also envisioned.
- methods of synthesizing the compounds of the described herein will be evident to those of ordinary skill in the art. Additionally, the various synthetic steps may be performed in an alternate sequence or order to give the desired compounds. Synthetic chemistry transformations and protecting group methodologies (protection and deprotection) useful in synthesizing the compounds described herein are known in the art and include, for example, those such as described in R.
- peptides can be synthesized using the automated Merrifield techniques of solid phase synthesis with the ⁇ -NH 2 protected by either t-Boc or F-moc chemistry using side chain protected amino acids on, for example, an Applied Biosystems Peptide Synthesizer Model 430A or 431.
- SPPS solid phase peptide synthesis
- the C-terminal amino acid is attached to a cross-linked polystyrene resin via an acid labile bond with a linker molecule.
- This resin is insoluble in the solvents used for synthesis, making it relatively simple and fast to wash away excess reagents and by-products.
- the N-terminus is protected with the Fmoc group, which is stable in acid, but removable by base. Any side chain functional groups are protected with base stable, acid labile groups.
- Longer peptides could be made by conjoining individual synthetic peptides using native chemical ligation. Alternatively, the longer synthetic peptides can be synthesized by well known recombinant DNA techniques. Such techniques are provided in well-known standard manuals with detailed protocols.
- a gene encoding a peptide of this invention the amino acid sequence is reverse translated to obtain a nucleic acid sequence encoding the amino acid sequence, preferably with codons that are optimum for the organism in which the gene is to be expressed.
- a synthetic gene is made, typically by synthesizing oligonucleotides which encode the peptide and any regulatory elements, if necessary.
- the synthetic gene is inserted in a suitable cloning vector and transfected into a host cell.
- the peptide is then expressed under suitable conditions appropriate for the selected expression system and host.
- the peptide is purified and characterized by standard methods.
- the peptides can be made in a high-throughput, combinatorial fashion, e.g., using a high- throughput polychannel combinatorial synthesizer available from Advanced Chemtech.
- Figures 28a-28f depict various peptides that include domains that are useful for creating cross-linked peptides.
- the present invention provides for both prophylactic and therapeutic methods of treating a subject at risk of (or susceptible to) a disorder or having a disorder associated with aberrant (e.g., insufficient or excessive) BCL-2 family member expression or activity (e.g., extrinsic or intrinsic apoptotic pathway abnormalities).
- aberrant e.g., insufficient or excessive
- BCL-2 family member expression or activity e.g., extrinsic or intrinsic apoptotic pathway abnormalities
- treatment is defined as the application or administration of a therapeutic agent to a patient, or application or administration of a therapeutic agent to an isolated tissue or cell line from a patient, who has a disease, a symptom of disease or a predisposition toward a disease, with the purpose to cure, heal, alleviate, relieve, alter, remedy, ameliorate, improve or affect the disease, the symptoms of disease or the predisposition toward disease.
- a therapeutic agent includes, but is not limited to, small molecules, peptides, antibodies, ribozymes and antisense oligonucleotides.
- BCL-2 type disorders can be caused, at least in part, by an abnormal level of one or more BCL-2 family members (e.g., over or under expression), or by the presence of one or more BCL-2 family members exhibiting abnormal activity.
- the reduction in the level and/or activity of the BCL-2 family member or the enhancement of the level and/or activity of the BCL-2 family member which would bring about the amelioration of disorder symptoms.
- the polypeptides of the invention can be used to treat, prevent, and/or diagnose cancers and neoplastic conditions.
- cancer refers to cells having the capacity for autonomous growth, i.e., an abnormal state or condition characterized by rapidly proliferating cell growth.
- hyperproliferative and neoplastic disease states may be categorized as pathologic, i.e., characterizing or constituting a disease state, or may be categorized as non-pathologic, i.e., a deviation from normal but not associated with a disease state.
- pathologic i.e., characterizing or constituting a disease state
- non-pathologic i.e., a deviation from normal but not associated with a disease state.
- the term is meant to include all types of cancerous growths or oncogenic processes, metastatic tissues or malignantly transformed cells, tissues, or organs, irrespective of histopathologic type or stage of invasiveness.
- “Pathologic hyperproliferative” cells occur in disease states characterized by malignant tumor growth.
- Examples of non-pathologic hyperproliferative cells include proliferation of cells associated with wound repair.
- Examples of cellular proliferative and/or differentiative disorders include cancer, e.g., carcinoma, sarcoma, or metastatic disorders.
- the compounds i.e., polypeptides
- a metastatic tumor can arise from a multitude of primary tumor types, including but not limited to those of breast, lung, liver, colon and ovarian origin.
- cancers or neoplastic conditions include, but are not limited to, a fibrosarcoma, myosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, gastric cancer, esophageal cancer, rectal cancer, pancreatic cancer, ovarian cancer, prostate cancer, uterine cancer, cancer of the head and neck, skin cancer, brain cancer, squamous cell carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinoma, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile
- proliferative disorders examples include hematopoietic neoplastic disorders.
- hematopoietic neoplastic disorders includes diseases involving hyperplastic/neoplastic cells of hematopoietic origin, e.g., arising from myeloid, lymphoid or erythroid lineages, or precursor cells thereof.
- the diseases arise from poorly differentiated acute leukemias, e.g., erythroblastic leukemia and acute megakaryoblastic leukemia.
- myeloid disorders include, but are not limited to, acute promyeloid leukemia (APML), acute myelogenous leukemia (AML) and chronic myelogenous leukemia (CML) (reviewed in Vaickus, L. (1991) Crit Rev. in Oncol. /Hemotol. 11:267-97); lymphoid malignancies include, but are not limited to acute lymphoblastic leukemia (ALL) which includes B-lineage ALL and T-lineage ALL, chronic lymphocytic leukemia (CLL), prolymphocytic leukemia (PLL), hairy cell leukemia (HLL) and Waldenstrom's macroglobulinemia (WM).
- ALL acute lymphoblastic leukemia
- CLL chronic lymphocytic leukemia
- PLL prolymphocytic leukemia
- HLL hairy cell leukemia
- WM Waldenstrom's macroglobulinemia
- malignant lymphomas include, but are not limited to non-Hodgkin lymphoma and variants thereof, peripheral T cell lymphomas, adult T cell leukemia/lymphoma (ATL), cutaneous T-cell lymphoma (CTCL), large granular lymphocytic leukemia (LGF), Hodgkin's disease and Reed-Sternberg disease.
- proliferative breast disease including, e.g., epithelial hyperplasia, sclerosing adenosis, and small duct papillomas
- tumors e.g., stromal tumors such as fibroadenoma, phyllodes tumor, and sarcomas, and epithelial tumors such as large duct papilloma
- carcinoma of the breast including in situ (noninvasive) carcinoma that includes ductal carcinoma in situ (including Paget's disease) and lobular carcinoma in situ, and invasive (infiltrating) carcinoma including, but not limited to, invasive ductal carcinoma, invasive lobular carcinoma, medullary carcinoma, colloid (mucinous) carcinoma, tubular carcinoma, and invasive papillary carcinoma, and miscellaneous malignant neoplasms.
- disorders in the male breast include, but are not limited to, gynecomastia and carcinoma.
- cellular proliferative and/or differentiative disorders of the lung include, but are not limited to, bronchogenic carcinoma, including paraneoplastic syndromes, bronchioloalveolar carcinoma, neuroendocrine tumors, such as bronchial carcinoid, miscellaneous tumors, and metastatic tumors; pathologies of the pleura, including inflammatory pleural effusions, noninflammatory pleural effusions, prieumothorax, and pleural tumors, including solitary fibrous tumors (pleural fibroma) and malignant mesothelioma.
- Examples of cellular proliferative and/or differentiative disorders of the colon include, but are not limited to, non-neoplastic polyps, adenomas, familial syndromes, colorectal carcinogenesis, colorectal carcinoma, and carcinoid tumors.
- Examples of cellular proliferative and/or differentiative disorders of the liver include, but are not limited to, nodular hyperplasias, adenomas, and malignant tumors, including primary carcinoma of the liver and metastatic tumors.
- ovarian tumors such as, tumors of coelomic epithelium, serous tumors, mucinous tumors, endometeriod tumors, clear cell adenocarcinoma, cystadenofibroma, brenner tumor, surface epithelial tumors; germ cell tumors such as mature (benign) teratomas, monodermal teratomas, immature malignant teratomas, dysgerminoma, endodermal sinus tumor, choriocarcinoma; sex cord-stomal tumors such as, granulosa-theca cell tumors, thecoma- fibromas, androblastomas, hill cell tumors, and gonadoblastoma; and metastatic tumors such as Krukenberg tumors.
- ovarian tumors such as, tumors of coelomic epithelium, serous tumors, mucinous tumors, endometeriod tumors, clear cell adenocarcinoma, cystadenofibro
- the polypeptides described herein can also be used to treat, prevent or diagnose conditions charaterised by overactive cell death or cellular death due to physiologic insult etc.
- conditions characterized by premature or unwanted cell deth are or alternatively unwanted or excessive cellular proliferation include, but are not limited to hypocellular/hypoplastic, acellular/aplastic, or hypercellular/hyperplastic conditions.
- Some examples include hematologic disorders including but not limited to fanconi anemia, aplastic anemia, thalaessemia, congenital neutropenia, myelodysplasia.
- the polypeptides of the invention that act to decrease apoptosis can be used to treat disorders associated with an undesirable level of cell death.
- the anti-apoptotic peptides of the invention can be used to treat disorders such as those that lead to cell death associated with viral infection, e.g., infection associated with infection with human immunodeficiency virus (HTV).
- HTV human immunodeficiency virus
- a wide variety of neurological diseases are characterized by the gradual loss of specific sets of neurons, and the anti-apoptotic peptides of the infection can be used in the treatment of these disorders.
- disorders include Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis (ALS) retinitis pigmentosa, spinal muscular atrophy, and various forms of cerebellar degeneration.
- ALS amyotrophic lateral sclerosis
- the cell loss in these diseases does not induce an inflammatory response, and apoptosis appears to be the mechanism of cell death.
- hematologic diseases are associated with a decreased production of blood cells. These disorders include anemia associated with chronic disease, aplastic anemia, chronic neutropenia, and the myelodysplastic syndromes.
- disorders of blood cell production such as myelodysplastic syndrome and some forms of aplastic anemia, are associated with increased apoptotic cell death within the bone marrow. These disorders could result from the activation of genes that promote apoptosis, acquired deficiencies in stromal cells or hematopoietic survival factors, or the direct effects of toxins and mediators of immune responses.
- Two common disorders associated with cell death are myocardial infarctions and stroke.
- immunologic disorders that can be treated with the polypeptides described herein include but are not limited to organ transplant rejection, arthritis, lupus, IBD, crone's disease, asthma, multiple sclerosis, diabetes etc.
- neurologic disorders that can be treated with the polypeptides described herein include but are not limited to Alzheimer's Disease, Down's Syndrome, Dutch Type Hereditary Cerebral Hemorrhage Amyloidosis, Reactive Amyloidosis, Familial Amyloid Nephropathy with Urticaria and Deafness, Muckle-Wells Syndrome, Idiopathic Myeloma; Macroglobulinemia- Associated Myeloma, Familial Amyloid Polyneuropathy, Familial Amyloid Cardiomyopathy, Isolated Cardiac Amyloid, Systemic Senile Amyloidosis, Adult Onset Diabetes, Insulinoma, Isolated Atrial Amyloid, Medullary Carcinoma of the Thyroid, Familial Amyloidosis, Hereditary Cerebral Hemorrhage With Amyloidosis, Familial Amyloidotic Polyneuropathy, Scrapie, Creutzfeldt- Jacob Disease, Gerstmann Straussler-Scheinker Syndrome, Bovine Spongi
- endocrinologic disorders that can be treated with the polypeptides described herein include but are not limited to diabetes, hypthyroidism, hyopituitarism, hypoparathyroidism, hypogonadism, etc.
- cardiovascular disorders e.g., inflammatory disorders
- cardiovascular disorders include, but are not limited to, atherosclerosis, myocardial infarction, stroke, thrombosis, aneurism, heart failure, ischemic heart disease, angina pectoris, sudden cardiac death, hypertensive heart disease; non-coronary vessel disease, such as arteriolosclerosis, small vessel disease, nephropathy, hypertriglyceridemia, hypercholesterolemia, hyperlipidemia, xanthomatosis, asthma, hypertension, emphysema and chronic pulmonary disease; or a cardiovascular condition associated with interventional procedures ("procedural vascular trauma"), such as restenosis following angioplasty, placement of interventional procedures.
- compositions and Routes of Administration As used herein, the compounds of this invention, including the compounds of formulae described herein, are defined to include pharmaceutically acceptable derivatives or prodrugs thereof.
- a "pharmaceutically acceptable derivative or prodrug” means any pharmaceutically acceptable salt, ester, salt of an ester, or other derivative of a compound of this invention which, upon administration to a recipient, is capable of providing (directly or indirectly) a compound of this invention.
- Particularly favored derivatives and prodrugs are those that increase the bioavailability of the compounds of this invention when such compounds are administered to a mammal (e.g., by allowing an orally administered compound to be more readily absorbed into the blood) or which enhance delivery of the parent compound to a biological compartment (e.g., the brain or lymphatic system) relative to the parent species.
- Preferred prodrugs include derivatives where a group which enhances aqueous solubility or active transport through the gut membrane is appended to the structure of formulae described herein.
- the compounds of this invention may be modified by appending appropriate functionalities to enhance selective biological properties.
- compositions of this invention include those derived from pharmaceutically acceptable inorganic and organic acids and bases.
- Suitable acid salts include acetate, adipate, benzoate, benzenesulfonate, butyrate, citrate, digluconate, dodecylsulfate, formate, fumarate, glycolate, hemisulfate, heptanoate, hexanoate, hydrochloride, hydrobromide, hydroiodide, lactate, maleate, malonate, methanesulfonate, 2- naphthalenesulfonate, nicotinate, nitrate, palmoate, phosphate, picrate, pivalate, propionate, salicylate, succinate, sulfate, tartrate, tosylate and undecanoate.
- Salts derived from appropriate bases include alkali metal (e.g., sodium), alkaline earth metal (e.g., magnesium), ammonium and N-(alkyl) 4 + salts.
- alkali metal e.g., sodium
- alkaline earth metal e.g., magnesium
- ammonium e.g., sodium
- N-(alkyl) 4 + salts e.g., sodium
- alkali metal e.g., sodium
- alkaline earth metal e.g., magnesium
- ammonium e.g., sodium
- N-(alkyl) 4 + salts e.g., sodium
- the compounds of the formulae described herein can, for example, be administered by injection, intravenously, intraarterially, subdermally, intraperitoneally, intramuscularly, or subcutaneously; or orally, buccally, nasally, transmucosally, topically, in an ophthalmic preparation, or by inhalation, with a dosage ranging from about 0.001 to about 100 mg/kg of body weight, or according to the requirements of the particular drug.
- the methods herein contemplate administration of an effective amount of compound or compound composition to achieve the desired or stated effect.
- the pharmaceutical compositions of this invention will be administered from about 1 to about 6 times per day or alternatively, as a continuous infusion. Such administration can be used as a chronic or acute therapy.
- the amount of active ingredient that may be combined with the carrier materials to produce a single dosage form will vary depending upon the host treated and the particular mode of administration.
- a typical preparation will contain from about 5% to about 95% active compound (w/w).
- such preparations contain from about 20% to about 80% active compound.
- Lower or higher doses than those recited above may be required.
- Specific dosage and treatment regimens for any particular patient will depend upon a variety of factors, including the activity of the specific compound employed, the age, body weight, general health status, sex, diet, time of administration, rate of excretion, drug combination, the severity and course of the disease, condition or symptoms, the patient's disposition to the disease, condition or symptoms, and the judgment of the treating physician.
- compositions of this invention comprise a compound of the formulae described herein or a pharmaceutically acceptable salt thereof; an additional agent including for example, morphine or codeine; and any pharmaceutically acceptable carrier, adjuvant or vehicle.
- compositions of this invention comprise a compound of the formulae described herein or a pharmaceutically acceptable salt thereof; and a pharmaceutically acceptable carrier, adjuvant or vehicle.
- the compositions delineated herein include the compounds of the formulae delineated herein, as well as additional therapeutic agents if present, in amounts effective for achieving a modulation of disease or disease symptoms, including BCL-2 family member mediated disorders or symptoms thereof.
- pharmaceutically acceptable carrier or adjuvant refers to a carrier or adjuvant that may be administered to a patient, together with a compound of this invention, and which does not destroy the pharmacological activity thereof and is nontoxic when administered in doses sufficient to deliver a therapeutic amount of the compound.
- Pharmaceutically acceptable carriers, adjuvants and vehicles that may be used in the pharmaceutical compositions of this invention include, but are not limited to, ion exchangers, alumina, aluminum stearate, lecithin, self-emulsifying drug delivery systems (SEDDS) such as d- ⁇ -tocopherol polyethyleneglycol 1000 succinate, surfactants used in pharmaceutical dosage forms such as Tweens or other similar polymeric delivery matrices, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, cellulose-based substances, polyethylene glycol, sodium carboxymethylcellulose, polyacrylates, waxes, polyethylene
- Cyclodextrins such as ⁇ -, ⁇ -, and ⁇ -cyclodextrin, may also be advantageously used to enhance delivery of compounds of the formulae described herein.
- the pharmaceutical compositions of this invention may be administered orally, parenterally, by inhalation spray, topically, rectally, nasally, buccally, vaginally or via an implanted reservoir, preferably by oral administration or administration by injection.
- the pharmaceutical compositions of this invention may contain any conventional nori-toxic pharmaceutically-acceptable carriers, adjuvants or vehicles.
- the pH of the formulation may be adjusted with pharmaceutically acceptable acids, bases or buffers to enhance the stability of the formulated compound or its delivery form.
- parenteral as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.
- the pharmaceutical compositions may be in the form of a sterile injectable preparation, for example, as a sterile injectable aqueous or oleaginous suspension. This suspension may be formulated according to techniques known in the art using suitable dispersing or wetting agents (such as, for example, Tween 80) and suspending agents.
- the sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol.
- a non-toxic parenterally acceptable diluent or solvent for example, as a solution in 1,3-butanediol.
- acceptable vehicles and solvents that may be employed are mannitol, water, Ringer's solution and isotonic sodium chloride solution.
- sterile, fixed oils are conventionally employed as a solvent or suspending medium.
- any bland fixed oil may be employed including synthetic mono- or diglycerides.
- Fatty acids such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions.
- These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant, or carboxymethyl cellulose or similar dispersing agents which are commonly used in the formulation of pharmaceutically acceptable dosage forms such as emulsions and or suspensions.
- Other commonly used surfactants such as Tweens or Spans and/or other similar emulsifying agents or bioavailability enhancers which are commonly used in the manufacture of pharmaceutically acceptable solid, liquid, or other dosage forms may also be used for the purposes of formulation.
- compositions of this invention may be orally administered in any orally acceptable dosage form including, but not limited to, capsules, tablets, emulsions and aqueous suspensions, dispersions and solutions.
- carriers which are commonly used include lactose and corn starch.
- Lubricating agents such as magnesium stearate, are also typically added.
- useful diluents include lactose and dried corn starch.
- aqueous suspensions and/or emulsions are administered orally, the active ingredient may be suspended or dissolved in an oily phase is combined with emulsifying and/or suspending agents. JJ desired, certain sweetening and/or flavoring and/or coloring agents may be added.
- compositions of this invention may also be administered in the form of suppositories for rectal administration.
- These compositions can be prepared by mixing a compound of this invention with a suitable non-irritating excipient which is solid at room temperature but liquid at the rectal temperature and therefore will melt in the rectum to release the active components.
- suitable non-irritating excipient include, but are not limited to, cocoa butter, beeswax and polyethylene glycols.
- the pharmaceutical compositions of this invention may be administered by nasal aerosol or inhalation.
- compositions are prepared according to techniques well-known in the art of pharmaceutical formulation and may be prepared as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, fluorocarbons, and/or other solubilizing or dispersing agents known in the art.
- both the compound and the additional agent should be present at dosage levels of between about 1 to 100%, and more preferably between about 5 to 95% of the dosage normally administered in a monotherapy regimen.
- the additional agents may be administered separately, as part of a multiple dose regimen, from the compounds of this invention. Alternatively, those agents may be part of a single dosage form, mixed together with the compounds of this invention in a single composition.
- the invention provides methods (also referred to herein as “screening assays") for identifying polypeptides which modulate the activity of one or more BCL-2 family proteins or which bind to one or more BCL-2 family proteins (e.g., a polypeptide having at least one BH homology domain).
- Screening assays for identifying polypeptides which modulate the activity of one or more BCL-2 family proteins or which bind to one or more BCL-2 family proteins (e.g., a polypeptide having at least one BH homology domain).
- the binding affinity of polypeptides desribed herein can be determined using, for example, a titration binding assay.
- a BCL-2 family polypeptide or polypeptide comprising a BH domain can be exposed to varying concentrations of a candidate compound (i.e., polypeptide) (e.g., 1 nM, 10 nM, 100 nM, 1 ⁇ M, 10 ⁇ M, 100 ⁇ M, 1 mM, and 10 mM) in the presence of a substrate such as a fluorescently labeled BH3 containing polypeptide or a fragment thereof (e.g., BJD, BAD, BAK, BAX, etc.).
- a candidate compound i.e., polypeptide
- a substrate such as a fluorescently labeled BH3 containing polypeptide or a fragment thereof (e.g., BJD, BAD, BAK, BAX, etc.).
- each concentration of candidate compound is then analyzed to determine the effect of the candidate compound on BCL-2 family binding activity at varying concentrations, which can be used to calculate the Kj of the candidate compound.
- the candidate compound can modulate BCL-2 type activity in a competitive or non-competitive manner.
- Direct binding assays can also be performed between BCL-2 family proteins and fluorescently labeled candidate compounds to determine the K J for the binding interaction.
- Candidate compounds could also be screened for biological activity in vitro, for example, by measuring their dose-responsive efficacy in triggering cytochrome c from purified mitochondria.
- Cell permeability screening assays are also envisioned, in which fluorescently labeled candidate compounds are applied to intact cells, which are then assayed for cellular fluorescence by microscopy or high-throughput cellular fluorescence detection.
- the assays described herein can be performed with individual candidate compounds or can be performed with a plurality of candidate compounds. Where the assays are performed with a plurality of candidate compounds, the assays can be performed using mixtures of candidate compounds or can be run in parallel reactions with each reaction having a single candidate compound.
- the test compounds or agents can be obtained using any of the numerous approaches in combinatorial library methods known in the art.
- an assay is a cell-based assay in which a cell that expresses a BCL-2 family protein or biologically active portion thereof is contacted with a candidate polypeptide, and the ability of the test compound to modulate BCL-2 type activity is determined (e.g., in some instances increase in apoptosis and in other instances decrease apoptosis, via intrinsic or extrinsic cell death pathways). Determining the ability of the test compound to modulate BCL-2 type activity within cells can be accomplished by monitoring, for example, release of cytochrome c from the mitochondria or other relevant physiologic readout (e.g., annexin V staining, MTT assay, caspase activity assay, TUNEL assay).
- cytochrome c from the mitochondria or other relevant physiologic readout
- an assay is a biochemical assay, whereby crosslinked polypeptides can be linked to affinity resin in order to purify or identify new or known interactive partners in the apoptotic pathway.
- Cell surface - Natural peptides representing key helical regions of the HTV-1 protein gp41 have been shown to prevent viral fusion, and therefore, HIV infectivity.
- Helical peptides participate in fusion mechanisms essential to many virus-host cell infection paradigms (eg. Dengue, Hepatitis C, Influenza), and therefore, hydrocarbon-stapled analogues of these critical helical regions may function as effective antibiotics by inhibiting viral fusion.
- ligands that interact with cell surface receptors ⁇ ising helical interfaces to activate or inhibit signaling pathways represent additional applications for the polypeptides described herein.
- Intramembrane - Receptor dimerization and oligomerization are cardinal features of ligand-induced receptor activation and signaling.
- Transmembrane helical domains widely participate in such essential oligomerization reactions (eg. Epidermal Growth Factor Receptor [EGFR] family), and specific peptide sequences have been defined that facilitate these tight intramembrane helical associations.
- EGFR Epidermal Growth Factor Receptor
- Aberrant activation of such receptors through oligomerization are implicated in disease pathogenesis (eg. erbB and cancer). Therefore, in the appropriate setting, activation or inhibition of transmembrane inter-helical interactions would have therapeutic benefit.
- Cytosolic - Cytosolic targets include soluble protein targets and those associated with specific intracytosolic organelles, including the mitochondria, endoplasmic reticulum, Golgi network, lysosome, and peroxisome. Within the field of apoptosis, there are multiple cytosolic and mitochondrial apoptotic protein targets for hydrocarbon-stapled BCL-2 family domains.
- BJD-like BH3s e.g., BIM
- BAD-like BH3s which are apoptosis "sensitizers” that selectively target anti-apoptotic multidomain proteins, enabling subliminal levels of activating domains to be maximally effective.
- BH3 domains display differential binding among anti-apoptotic proteins.
- BAD preferentially binds to the anti-apoptotic BCL-2
- BIM targets the anti-apoptotic MCL-1. Identifying and exploring these selective interactions are critically important because different BCL-2 family members are implicated in different types of cancer. For example, BCL-2 overexpression is responsible for the development of follicular lymphoma and chemotherapy resistance in general, whereas MCL-1 is believed to play an important role in the pathogenesis of multiple myeloma.
- Nuclear - Nuclear transcription factors and their modulatory proteins drive a host of physiologic processes based upon peptide helical interactions with nuclear proteins and nucleic acids.
- the feasibility of generating hydrocarbon-stapled peptides to engage in nuclear interactions has recently been demonstrated by our synthesis of a panel of hydrocarbon-stapled p53 peptides, which interact with MDM2 at picomolar affinities.
- protein-nucleic acid interactions are also apparent targets.
- Multiple transcription factor families such as homeodomain, basic helix-loop-helix, nuclear receptor, and zinc finger-containing proteins, directly interact with DNA via their peptide helices to activate or inhibit gene transcription.
- homeodomain proteins are a family of essential transcription factors that regulate genetic programs of growth and differentiation in all multicellular organisms. These proteins share a conserved DNA-binding motif, called the homeodomain, which contains a 60 amino acid long peptide that forms three a- helices, the third of which makes direct contact with the major groove of DNA. Like the BH3 domain of apoptotic proteins, the homeodomain is a critical effector motif with sufficient variation among homologs to facilitate differential binding specificities and physiologic activities. Protein-DNA interactions can be complex and extensive, and thereby present a challenge to small molecule development for the purpose of studying and selectively modulating transcriptional events. In higher organisms, homeodomain proteins are highly expressed during development, specifying the body plan and dictating tissue differentiation.
- Overexpression of specific homeoproteins can activate tissue-specific differentiation programs resulting in, for example, blood formation from mouse embryonic stem cells.
- Deregulation of homeotic gene expression such as aberrant upregulation of homeodomain proteins typically expressed in undifferentiated cells or inappropriate downregulation of such proteins normally expressed in differentiated cells, can contribute to the development and maintenance of cancer.
- fusion of the PAX3 or PAX 7 DNA binding domain to the transactivating domain of forkhead has been implicated in cellular transformation; translocations involving the DNA-binding domains of several HOX genes have been linked to the pathogenesis of leukemia.
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Abstract
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AU2004287884A AU2004287884C1 (en) | 2003-11-05 | 2004-11-05 | Stabilized alpha helical peptides and uses thereof |
BRPI0416258-7A BRPI0416258A (en) | 2003-11-05 | 2004-11-05 | stabilized alpha helical peptides and applications thereof |
ES04811198.3T ES2437567T3 (en) | 2003-11-05 | 2004-11-05 | Stabilized alpha helical peptides and uses thereof |
EP04811198.3A EP1680443B9 (en) | 2003-11-05 | 2004-11-05 | Stabilized alpha helical peptides and uses thereof |
DK04811198.3T DK1680443T5 (en) | 2003-11-05 | 2004-11-05 | Stabilized alpha-helix peptides and uses thereof |
PL04811198T PL1680443T3 (en) | 2003-11-05 | 2004-11-05 | Stabilized alpha helical peptides and uses thereof |
JP2006540005A JP5122142B2 (en) | 2003-11-05 | 2004-11-05 | Stabilized α-helix peptides and methods of use thereof |
IL175152A IL175152A (en) | 2003-11-05 | 2006-04-25 | Stabilized alpha helical peptides and uses thereof |
HK06111088.4A HK1089191A1 (en) | 2003-11-05 | 2006-10-09 | Stabilized alpha helical peptides and uses thereof |
IL235348A IL235348B (en) | 2003-11-05 | 2014-10-27 | Method of making a polypeptide |
IL247907A IL247907B (en) | 2003-11-05 | 2016-09-19 | A method of producing a modified cell-permeable α-helical polypeptide |
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- 2004-11-05 DK DK10195495.6T patent/DK2332968T3/en active
- 2004-11-05 US US10/981,873 patent/US7723469B2/en active Active
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