US20070021433A1 - Pharmacological chaperones for treating obesity - Google Patents
Pharmacological chaperones for treating obesity Download PDFInfo
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- US20070021433A1 US20070021433A1 US11/446,429 US44642906A US2007021433A1 US 20070021433 A1 US20070021433 A1 US 20070021433A1 US 44642906 A US44642906 A US 44642906A US 2007021433 A1 US2007021433 A1 US 2007021433A1
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Definitions
- the invention relates to methods of enhancing normal melanocortin-4 receptor (MC4R) activity, and to enhancing activity of an MC4R having a mutation or mutations which affects protein folding and/or processing of the MC4R.
- the invention provides a method of treating an individual having a condition in which increased activity of an MC4R at the cell surface would be beneficial, such as in obesity, by administering an effective amount of a pharmacological chaperone for the MC4R.
- the invention provides MC4R pharmacological chaperones which enhance activity of MC4R.
- the invention further provides a method of screening to identify pharmacological chaperones which enhance folding of an MC4R in the endoplasmic reticulum (ER), in order to enhance activity of the MC4R at the cell surface.
- ER endoplasmic reticulum
- Obesity represents the most prevalent of body weight disorders, and it is the most important nutritional disorder in the Western world, with estimates of its prevalence ranging from 30% to 50% of the middle-aged population. The number of overweight and obese Americans has continued to increase since 1960, a trend that is not slowing down. Today, 64.5 percent of adult Americans (about 127 million) are categorized as being overweight or obese. Each year, obesity causes at least 300,000 deaths in the U.S., and healthcare costs of American adults with obesity amount to approximately $100 billion (American Obesity Association).
- Obesity increases an individual's risk of developing conditions such as high blood pressure, diabetes (type 2), hyperlipidemia, heart disease, hypertension, stroke, gallbladder disease, and cancer of the breast, prostate, and colon (see, e.g., Nishina, P. M. et al., 1994 , Metab . 43: 554-558; Grundy, S. M. & Barnett, J. P., 1990 , Dis. Mon . 36: 641-731).
- the incidence of being overweight or obese occurs at higher rates in racial/ethnic minority populations such as African American and Hispanic Americans, compared with Caucasian Americans. Women and persons of low socioeconomic status within minority populations appear to particularly be affected by excess weight and obesity.
- risk factors for developing childhood obesity include having overweight parents, or parents unconcerned about their child's weight, increased energy intake due to larger serving sizes, increased sedentary lifestyle and decreased transport-related activity (walking to school or to the bus stop), having a temperament with high levels of anger/frustration (which may cause parents to give their child extra food and calories to decrease tantrums); having Down's Syndrome, mother's pregnancy Body Mass Index (BMI), and first born status (increased prevalence of obesity).
- BMI Body Mass Index
- BMI body weight for height
- Risk factors for developing obesity in adulthood include poor diet (high-calorie, low nutrients); lack of physical activity; working varied shifts; quitting smoking, having certain medical conditions such as rare hereditary diseases, and hormonal imbalances (such as hypothyroid, Cushing's disease and polycystic ovarian syndrome); certain medications (steroids and some antidepressants); being a racial or ethnic minority (especially a female minority); low socioeconomic status; age (increased risk from 20-55), pregnancy; and retirement (due to altered schedule).
- the melanocortin 4 receptor has been implicated in the regulation of body weight (Graham et al, Nat. Genetics 1997; 17: 273-4). MC4R is expressed in the brain, including the hypothalamus, which influences food intake. Numerous mutations affecting MC4R activity have been found and many are associated with obesity including early-onset (childhood) obesity (Nijenhuis et al., J. Biol. Chem . 2003, 278:22939-45; Branson et al., New Eng. J. Med . 2003, 348:1096-1103; Gu et al., Diabetes 1999, 48:635-39; Farooqi et al., New Eng. J. Med . 2003, 348:1085-95; Tao et al., Endocrinology 2003, 144:4544-51).
- Proteins are synthesized in the cytoplasm, and the newly synthesized proteins are secreted into the lumen of the endoplasmic reticulum (ER) in a largely unfolded state.
- ER endoplasmic reticulum
- protein folding is governed by the principle of self assembly. Newly synthesized polypeptides fold into their native conformation based on their amino acid sequences (Anfinsen et al., Adv. Protein Chem . 1975; 29:205-300). In vivo, protein folding is complicated, because the combination of ambient temperature and high protein concentration stimulates the process of aggregation, in which amino acids normally buried in the hydrophobic core interact with their neighbors non-specifically.
- chaperones which prevent nascent polypeptide chains from aggregating by binding to unfolded protein such that the protein refolds in the native conformation
- Endogenous molecular chaperones are present in virtually all types of cells and in most cellular compartments. Some are involved in the transport of proteins and permit cells to survive under stresses such as heat shock and glucose starvation (Gething et al., Nature 1992; 355:33-45; Caplan, Trends Cell. Biol . 1999; 9:262-268; Lin et al., Mol. Biol. Cell . 1993; 4:109-1119; Bergeron et al., Trends Biochem. Sci . 1994; 19:124-128).
- BiP immunoglobulin heavy-chain binding protein, Grp78
- BiP interacts with many secretory and membrane proteins within the ER throughout their maturation. When nascent protein folding proceeds smoothly, this interaction is normally weak and short-lived. Once the native protein conformation is achieved, the molecular chaperone no longer interacts with the protein. BiP binding to a protein that fails to fold, assemble, or be properly glycosylated becomes stable, and usually leads to degradation of the protein through the ER-associated degradation pathway.
- This process serves as a “quality control” system in the ER, ensuring that only those properly folded and assembled proteins are transported out of the ER for further maturation, and improperly folded proteins are retained for subsequent degradation (Hurtley et al., Annu. Rev. Cell. Biol . 1989; 5:277-307). Due to the combined actions of the inefficiency of the thermodynamic protein folding process and the ER quality control system, only a fraction of nascent (non-mutated) proteins become folded into a functional conformation and successfully exit the ER.
- small molecule inhibitors of enzymes associated with lysosomal storage disorders can both rescue folding and activity of the mutant enzyme, and enhance folding and activity of the wild-type enzyme (see U.S. Pat. Nos. 6,274,597; 6,583,158; 6,589,964; 6,599,919; and 6,916,829, all incorporated herein by reference).
- administration of small molecule derivatives of glucose and galactose which were specific competitive inhibitors of mutant enzymes associated with LSDs, effectively increased in vitro and in vivo stability of the mutant enzymes and enhanced the mutant enzyme activity.
- the ASSCs enhance ER secretion and activity of recombinant wild-type enzymes.
- An ASSC facilitates folding of overexpressed wild-type enzyme, which is otherwise retarded in the ER quality control system because overexpression and over production of the enzyme exceeds the capacity of the ER and leads to protein aggregation and degradation.
- a compound that induces a stable molecular conformation of an enzyme during folding serves as a “chaperone” to stabilize the enzyme in a proper conformation for exit from the ER.
- a compound that induces a stable molecular conformation of an enzyme during folding serves as a “chaperone” to stabilize the enzyme in a proper conformation for exit from the ER.
- a compound that induces a stable molecular conformation of an enzyme during folding serves as a “chaperone” to stabilize the enzyme in a proper conformation for exit from the ER.
- one such compound unexpectedly turned out to be a competitive inhibitor of the enzyme.
- small synthetic compounds were found to stabilize the DNA binding domain of mutant forms of the tumor suppressor protein p53, thereby allowing the protein to maintain an active conformation (Foster et al., Science 1999; 286:2507-10).
- Synthesis of receptors has been shown to be rescued by small molecule receptor antagonists and ligands (Morello et al., J. Clin. Invest . 2000; 105: 887-95; Petaja-Repo et al., EMBO J . 2002; 21:1628-37).
- the present invention provides a method for enhancing the activity of the melanocortin-4 receptor (MC4R), e.g., for the treatment of obesity, in subjects who have a folding mutation in the gene encoding MC4R, or in subjects for whom an increase in wild-type MC4R activity would be beneficial.
- M4R melanocortin-4 receptor
- the present invention provides a method for enhancing intracellular folding of an MC4R polypeptide into a functional conformation by contacting an MC4R-expressing cell with an effective amount of a pharmacological chaperone.
- the MC4R polypeptide is a wild-type MC4R polypeptide, which, for example, has a sequence as depicted in SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, or SEQ ID NO: 8.
- the MC4R polypeptide is a mutant MC4R polypeptide.
- the mutant polypeptide contains one or more mutations that result in reduced or improper intracellular folding of the MC4R polypeptide.
- Exemplary mutations are as follows: P78L, R165Q, R165W, I125K, C271Y, T11A, A175T, I316L, I316S, I317T, N97D, G98R, N62S, C271R, S58C, N62S, N97D, Y157S, I102S, L106P, L250Q, Y287X, P299H, S58C, CTCT at codon 211, and TGAT insertion at codon 244.
- the pharmacological chaperone is an MC4R antagonist. In another embodiment, the pharmacological chaperone is an MC4R agonist. In other embodiments, the pharmacological chaperone is an MC4R partial agonist and/or inverse agonist.
- the present invention also provides a method for enhancing cell surface expression of an MC4R polypeptide.
- This method comprises contacting an MC4R-expressing cell with an effective amount of a pharmacological chaperone.
- This embodiment of the invention pertains to both wild-type MC4R polypeptides and mutant MC4R polypeptides, and the pharmacological chaperones set forth above, for methods of enhancing intracellular folding of MC4R polypeptides.
- the present invention also provides a screening method for identifying a chaperone for an MC4R polypeptide by contacting a test compound to a reaction mixture that comprises a cell expressing an MC4R polypeptide; detecting stability, activity, and/or cell surface localization of the MC4R polypeptide in the reaction mixture in the presence of the test compound; and comparing stability, activity, and/or cell surface localization of the MC4R polypeptide in the presence of the test compound to the stability, activity, and/or cell surface localization of the MC4R polypeptide in the absence of said test compound, where detection of increased stability, activity, and/or cell surface localization in the presence of the test compound relative to the absence of the test compound indicates that the test compound is a chaperone for the MC4R polypeptide.
- the MC4R polypeptide comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 2, 4, 6 and 8.
- the MC4R polypeptide comprises a mutation associated with misfolding of the MC4R polypeptide.
- the misfolding mutation is one or more of the following alterations: P78L, R165Q or R165W, I125K, C271Y, T11A, A175T, I316L, I316S, I317T, N97D, G98R, N62S, C271R, S58C, N62S, N97D, Y157S, I102S, L106P, L250Q, Y287X, P299H, S58C, CTCT at codon 211, or TGAT insertion at codon 244.
- reaction mixture is cell-based. In another embodiment, the reaction mixture is cell-free.
- the screening method further includes detecting activity of an MC4R polypeptide, e.g., on the cell surface. In another embodiment, the activity is measured through cAMP activation.
- FIG. 1 An agonist of the rat and human melanocortin-4 receptors, as reported by Sebhat, 2002 , J Med Chem , 45, 4589-4593 (compound 1).
- FIG. 2 An agonist of human MC4R, as reported by Richardson, 2004 , J Med Chem 47, 744-755 (compound 2).
- FIG. 3 Synthetic scheme for compound 1.
- FIG. 4 Synthetic scheme for compound of 2.
- FIG. 5 An antagonist of MC4R, as reported by Arasasingham, 2003 , J Med Chem 46, 9-11 (compound 3).
- FIG. 6 An antagonist of MC4R (compound 4); the biological activity of this compound is reported in WO 02/062766 using a scintillation proximity assay.
- FIG. 7 Synthetic scheme for compound 3.
- FIG. 8 Synthetic scheme for compound 4.
- FIG. 9 A bisaminothiazole compound described in Pedemonte et al., J. Clin. Inves . 2005; 115: 2564-71 (compound 5).
- FIG. 1O A-D Compounds 6-25 described infra.
- FIG. 11 MC4R signaling assay in MC4R mutants treated with ligand agonist and with and without antagonist chaperones.
- FIG. 12 Mean ⁇ -galactosidase A activity in white blood cells from normal, healthy volunteers who received 50 mg 1-deoxygalactonojirimycin (DGJ) b.i.d. (triangles), 150 mg DGJ b.i.d. (squares), or placebo (open circles).
- DGJ 1-deoxygalactonojirimycin
- FIG. 13 Structure of compound class based upon compounds 1, 2, 6, 7, and 12-17.
- FIG. 14 Structure of compound class based upon compounds 3, 9, 10, 11, and 21.
- FIG. 15 Structure of compound class based upon compounds 4, 8, 24, and 25.
- FIG. 16 Structure of compound class based upon compounds 18-20.
- the present invention relates to the discovery that small molecules can be identified to rescue protein folding and processing of mutant and wild-type MC4R polypeptides and enhance protein stability on the cell surface of neurons, which in turn, decreases hunger and overeating.
- the pharmacological chaperones bind specifically to the MC4R protein and induce or stabilize a functional conformation of the mutant or wild-type MC4R.
- the invention therefore permits specific rescue of mutant MC4R, as well as enhanced expression of wild-type MC4R at the cell surface.
- pharmacological chaperones for MC4R can be used for the treatment of disorders where rescue of, or increased stability or activity of, MC4R is desired, e.g., the condition of being overweight or obese.
- the invention is based, in part, on the discovery that administration of a pharmacological chaperone to a human resulted in a meaningful increase in the level of activity of a wild-type protein.
- This discovery combined with an understanding of a pharmacological chaperone's ability to promote proper protein folding in the ER, leading to correct protein trafficking and significantly increased protein activity, advantageously provides the ability to achieve sufficient protein activity to reverse or ameliorate a disease, disorder, or condition, particularly in a human subject.
- This phenomenon is highly specific to the protein specifically bound by the particular pharmacological chaperone, in contrast to methods using compounds that operate generally to increase expression of all proteins, called “chemical chaperones.”
- pharmacological chaperones increased endogenous wild-type protein activity in humans to about 120% of normal, 130% of normal, and 145% of normal at a lower dose, and to 150% and 185% of normal at a higher dose after administration of a pharmacological chaperone (see Example 7 and FIG. 12 ).
- This level of increase in vivo was not predictable from results with cells in tissue culture which remain exposed to the pharmacological chaperone.
- 6,274,597 describes a 30% increase of a-galactosidase A ( ⁇ -Gal A) activity in normal lymphoblasts cultured in vitro with deoxygalactonojirimycin (DGJ), a pharmacological chaperone. Given the expectation that physiological clearance processes would be expected to reduce the effects of pharmacological chaperones on normal proteins in vivo, it was not expected that a pharmacological chaperone would yield a significant increase in wild-type protein activity.
- Example 10 of U.S. Pat. No. 6,274,597 describes an increase in activity of a mutant enzyme in transgenic mice treated for one week with a pharmacological chaperone. However, these experiments involved mutant forms of the rescued protein, not wild-type, and were conducted in mice, so the results were not predictive or suggestive of the results observed for wild-type protein in humans.
- a pharmacological chaperone could increase the level of activity of a wild-type protein in vivo by at least 20-25%, i.e., by at least 1.2-fold or 120% of normal, or by 30% (1.3-fold, 130% of normal), 40% (1.4-fold, 140% of normal), and particularly not by at least about 50% (1.5-fold, 150% of normal).
- administration of DGJ to subjects resulted in a dose-dependent increase in ⁇ -Gal A.
- This extraordinary effect results from titrating the pharmacological chaperone, which is already demonstrated in accordance with existing technology to rescue a mutant form of the protein, to achieve the disclosed increase in activity or wild-type protein.
- the invention provides for titrating a dose of a pharmacological chaperone that has been found to rescue activity of a mutant protein to increase the level of activity of a wild-type protein by a defined amount.
- the term “pharmacological chaperone,” or sometimes “specific pharmacological chaperone” (“SPC”) refers to a molecule that specifically binds to MC4R and has one or more of the following effects: (i) enhancing the formation of a stable molecular conformation of the protein; (ii) enhances proper trafficking of the protein from the ER to another cellular location, preferably a native cellular location, i.e., preventing ER-associated degradation of the protein; (iii) preventing aggregation of conformationally unstable, i.e., misfolded proteins; (iv) restoring or enhancing at least partial wild-type function, stability, and/or activity of the protein; and/or (v) improving the phenotype or function of the cell harboring MC4R.
- SPC specific pharmacological chaperone
- a pharmacological chaperone for MC4R is a molecule that binds to MC4R, resulting in proper folding, trafficking, non-aggregation, and activity of MC4R.
- this term does not refer to endogenous chaperones, such as BiP, or to non-specific agents which have demonstrated non-specific chaperone activity against various proteins, such as glycerol, DMSO or deuterated water, i.e., chemical chaperones (see Welch et al., Cell Stress and Chaperones 1996; 1(2):109-115; Welch et al., Journal of Bioenergetics and Biomembranes 1997; 29(5):491-502; U.S. Pat.
- the term “specifically binds” refers to the interaction of a pharmacological chaperone with MC4R, specifically, an interaction with amino acid residues of MC4R that directly participate in contacting the pharmacological chaperone.
- a pharmacological chaperone specifically binds to a target protein, here MC4R, to exert a chaperone effect on MC4R, and not on a generic group of related or unrelated proteins.
- the amino acid residues of MC4R that interact with any given MC4R pharmacological chaperone may or may not be within the MC4R ligand-binding domain, i.e., the domain that binds the natural ligand MSH, or any other MC4R “active site,” e.g., the G-protein binding domain. Specific binding can be evaluated through routine binding assays or through structural studies, e.g., co-crystallization, NMR, and the like.
- Examples of amino acids in the MSH ligand-binding domain of MC4R include but are not limited to Phe284 and Tyr268 (using, e.g., SEQ ID NO: 2 as a reference sequence).
- the pharmacological chaperone is an inhibitor or antagonist of MC4R. In another non-limiting embodiment, the pharmacological chaperone is an agonist of MC4R. In yet another embodiment, the pharmacological chaperone is a mixed agonist/antagonist.
- the term “antagonist” refers to any molecule that binds to a protein and either partially or completely blocks, inhibits, reduces, or neutralizes an activity of MC4R.
- the term “agonist” refers to any molecule that binds to a protein and at least partially increases, enhances, restores, or mimics an activity of MC4R. As discussed below, such molecules are known for MC4R.
- the terms “enhance MC4R conformational stability” or “increase MC4R conformational stability” refer to increasing the amount or proportion of MC4R that adopts a finctional conformation in a cell contacted with a pharmacological chaperone specific for MC4R, relative to MC4R in a cell (preferably of the same cell-type or the same cell, e.g., at an earlier time) not contacted with the pharmacological chaperone specific for MC4R.
- the cells do not express a conformation mutant MC4R.
- the cells do express a mutant MC4R polynucleotide encoding a polypeptide e.g., a conformational mutant MC4R.
- the terms “enhance MC4R trafficking” or “increase MC4R trafficking” refer to increasing the efficiency of transport of MC4R to the plasma membrane in a cell contacted with a pharmacological chaperone specific for MC4R, relative to the efficiency of transport of MC4R in a cell (preferably of the same cell-type or the same cell, e.g., at an earlier time) not contacted with the pharmacological chaperone specific for MC4R.
- the terms “enhance MC4R activity” or “increase MC4R activity” refer to increasing the activity of MC4R, as described herein, in a cell contacted with a pharmacological chaperone specific for MC4R, relative to the activity of MC4R in a cell (preferably of the same cell-type or the same cell, e.g., at an earlier time) not contacted with the pharmacological chaperone specific for MC4R.
- the terms “enhance MC4R level” or “increase MC4R level” refer to increasing the level of MC4R in a cell contacted with a pharmacological chaperone specific for MC4R, relative to the level of MC4R in a cell (preferably of the same cell-type or the same cell, e.g., at an earlier time) not contacted with the pharmacological chaperone specific for MC4R.
- stabilize a proper conformation refers to the ability of a MC4R pharmacological chaperone to induce or stabilize a conformation of a mutated MC4R protein that is fuictionally identical to the conformation of the wild-type MC4R protein.
- conformational flexibility does not result in (1) protein aggregation, (2) elimination through the endoplasmic reticulum-associated degradation pathway, (3) impairment of protein function, e.g., the ability to bind ligand and/or activate adenylyl cyclase activity, and/or (4) improper transport within the cell, e.g., localization to the plasma membrane, to a greater or lesser degree than that of the wild-type protein.
- stable molecular conformation refers to a conformation of a protein, i.e., MC4R, induced by a pharmacological chaperone, that provides at least partial wild-type function in the cell.
- a stable molecular conformation of a mutant MC4R would be one where MC4R escapes from the ER and is trafficked to the cell membrane as for a wild-type MC4R, instead of misfolding and being degraded.
- a stable molecular conformation of a mutated MC4R may also possess full or partial MC4R activity, e.g., adenylyl cyclase activating activity for enhanced cAMP generation via its cognate physiologic G protein.
- MC4R activity e.g., adenylyl cyclase activating activity for enhanced cAMP generation via its cognate physiologic G protein.
- the stable molecular conformation have all of the functional attributes of the wild-type protein.
- M4R activity refers to the normal physiological function of a wild-type MC4R in a cell.
- MC4R signals via interaction with a G-protein, G ⁇ s , and activation of adenylate cyclase (see e.g., VanLeeuwen et al., J Biol. Chem . 2003; 18: 15935-40).
- PKA protein kinase A
- binding assays of the ⁇ -, ⁇ -, or ⁇ -MSH ligand, or 125 I-[Nle 4 ,D-Phe 7 ] ⁇ -MSH agonist to MC4R, or using adenylyl cyclase activation assays, or luciferase reporter gene assays can be used to determine increases in intracellular cAMP.
- Cyclic AMP accumulation assays are well known in the art (see e.g., VanLeeuwen et al., J Biol. Chem . 2003; 18: 15935-40).
- M4R refers to a polypeptide encoded by a nucleotide sequence having the sequence as depicted in any one of: SEQ ID NO: 1 (human; GenBank Accession No. BC069172); 3 (human; GenBank Accession No. NM — 005912); 5 (rat; GenBank Accession No. NM — 013099); or 7 (murine; GenBank Accession No. NM — 016977).
- M4R polypeptide also refers to an amino acid sequence as depicted in SEQ ID NOs: 2 (human; GenBank Accession No. AAI01803); 4 (human; GenBank Accession No. NM — 005912); 6 (rat; GenBank Accession No. NM — 013099); or 8 (murine; GenBank Accession No. AF201662), and any other amino acid sequence that encodes an MC4R polypeptide having the same function and ligand binding affinity as any one of SEQ ID NOs: 2, 4, 6 or 8.
- wild-type MC4R refers to the nucleotide (SEQ ID NOs: 1, 3, 5 and 7) sequences encoding MC4R, and polypeptide (SEQ ID NOs: 2, 4, 6, and 8) sequences encoded by the aforementioned nucleotide sequences (human MC4R-GenBank Accession AAI01803; human MC4R-GenBank Accession No. NM — 005912; rat MC4R-GenBank Accession No.
- MC4R-GenBank Accession AF201662 any other nucleotide sequence that encodes MC4R polypeptide (having the same functional properties and binding affinities as the aforementioned polypeptide sequences), such as allelic variants in normal individuals, that have the ability to achieve a functional conformation in the ER, achieve proper localization within the cell, and exhibit wild-type activity (e.g., MC4R stimulation of cAMP accumulation).
- mutant MC4R refers to a MC4R polypeptide translated from a gene containing a genetic mutation that results in an altered MC4R amino acid sequence.
- the mutation results in a MC4R protein that does not achieve a native conformation under the conditions normally present in the ER, when compared with wild-type MC4R, or exhibits decreased stability or activity as compared with wild-type MC4R.
- a mutation This type of mutation is referred to herein as a “conformational mutation,” and the protein bearing such a mutation is referred as a “conformational mutant.”
- the failure to achieve this conformation results in MC4R protein being degraded or aggregated, rather than being transported through a normal pathway in the protein transport system to its native location in the cell or into the extracellular environment.
- a mutation may occur in a non-coding part of the gene encoding MC4R that results in less efficient expression of the protein, e.g., a mutation that affects transcription efficiency, splicing efficiency, mRNA stability, and the like.
- Exemplary mutations include P78L, R165Q, and R165W.
- Other MC4R mutants include I125K, C271Y, T11A, A175T, I316L, I316S, I317T, N97D, G98R, N62S, C271R, S58C, N62S, N97D, Y157S, I102S, L106P, L250Q, Y287X, P299H, S58C, CTCT at codon 211, and TGAT insertion at codon 244.
- other MC4R mutations include those described in Table 1, infra.
- Certain tests may evaluate attributes of a protein that may or may not correspond to its actual in vivo activity, but nevertheless are appropriate surrogates of protein functionality, and wild-type behavior in such tests demonstrates evidence to support the protein folding rescue or enhancement techniques of the invention.
- One such activity in accordance with the invention is appropriate transport of a functional MC4R from the endoplasmic reticulum to the cell membrane.
- endogenous expression and “endogenously expressed” refers to the normal physiological expression of MC4R in cells in an individual not having or suspected of having a disease or disorder associated with MC4R deficiency, overexpression of a dominant negative mutant, or other defect, e.g., obesity, such as a mutation in MC4R nucleic acid or polypeptide sequence that alters, e.g., inhibits its expression, activity, or stability.
- This term also refers to the expression of MC4R in cells or cell types in which it is normally expressed in healthy individuals, and does not include expression of MC4R in cells or cell types, e.g., tumor cells, in which MC4R is not expressed in healthy individuals.
- the term “efficiency of transport” refers to the ability of a mutant protein to be transported out of the endoplasmic reticulum to its native location within the cell, cell membrane, or into the extracellular environment.
- terapéuticaally effective dose and “effective amount” refer to an amount sufficient to enhance protein processing in the ER (permitting a functional conformation), without inhibiting protein already expressed at the appropriate cellular location (in the case of an antagonist), or without inducing ligand-mediated receptor internalization of protein from the appropriate cellular location (in the case of an agonist), and enhance activity of the target protein, thus resulting in a therapeutic response in a subject.
- a therapeutic response may be any response that a user (e.g., a clinician) will recognize as an effective response to the therapy, including the foregoing symptoms and surrogate clinical markers.
- a therapeutic response will generally be an amelioration or inhibition of one or more symptoms of a disease or disorder, e.g., obesity or binge eating.
- pharmaceutically acceptable refers to molecular entities and compositions that are physiologically tolerable and do not typically produce untoward reactions when administered to a human.
- pharmaceutically acceptable means approved by a regulatory agency of the federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, and more particularly in humans.
- carrier refers to a diluent, adjuvant, excipient, or vehicle with which the compound is administered. Such pharmaceutical carriers can be sterile liquids, such as water and oils.
- Water or aqueous saline solutions and aqueous dextrose and glycerol solutions are preferably employed as carriers, particularly for injectable solutions.
- Suitable pharmaceutical carriers are described in “Remington's Pharmaceutical Sciences” by E. W. Martin, 18th Edition, or other editions.
- the terms “about” and “approximately” shall generally mean an acceptable degree of error for the quantity measured given the nature or precision of the measurements. Typical, exemplary degrees of error are within 20 percent (%), preferably within 10%, and more preferably within 5% of a given value or range of values. Alternatively, and particularly in biological systems, the terms “about” and “approximately” may mean values that are within an order of magnitude, preferably within 5-fold and more preferably within 2-fold of a given value. Numerical quantities given herein are approximate unless stated otherwise, meaning that the term “about” or “approximately” can be inferred when not expressly stated.
- an isolated nucleic acid means that the referenced material is removed from the environment in which it is normally found.
- an isolated biological material can be free of cellular components, i.e., components of the cells in which the material is found or produced.
- an isolated nucleic acid includes a PCR product, an mRNA band on a gel, a cDNA, or a restriction fragment.
- an isolated nucleic acid is preferably excised from the chromosome in which it may be found, and more preferably is no longer joined to non-regulatory, non-coding regions, or to other genes, located upstream or downstream of the gene contained by the isolated nucleic acid molecule when found in the chromosome.
- the isolated nucleic acid lacks one or more introns.
- Isolated nucleic acids include sequences inserted into plasmids, cosmids, artificial chromosomes, and the like.
- a recombinant nucleic acid is an isolated nucleic acid.
- An isolated protein may be associated with other proteins or nucleic acids, or both, with which it associates in the cell, or with cellular membranes if it is a membrane-associated protein.
- An isolated organelle, cell, or tissue is removed from the anatomical site in which it is found in an organism.
- An isolated material may be, but need not be, purified.
- purified refers to material, such as a MC4R nucleic acid or polypeptide, that has been isolated under conditions that reduce or eliminate unrelated materials, i.e., contaminants.
- a purified protein is preferably substantially free of other proteins or nucleic acids with which it is associated in a cell.
- substantially free is used operationally, in the context of analytical testing of the material.
- purified material substantially free of contaminants is at least 50% pure; more preferably, at least 90% pure, and more preferably still at least 99% pure. Purity can be evaluated by conventional means, e.g., chromatography, gel electrophoresis, immunoassay, composition analysis, biological assay, and other methods known in the art.
- Me means methyl
- Et means ethyl
- Ac means acetyl
- halo unless otherwise indicated, means fluoro, chloro, bromo or iodo. Preferred halo groups are fluoro, chloro and bromo.
- alkyl includes saturated monovalent hydrocarbon radicals having straight, branched, or cyclic moieties (including fused and bridged bicyclic and spirocyclic moieties), or a combination of the foregoing moieties.
- cyclic moieties including fused and bridged bicyclic and spirocyclic moieties, or a combination of the foregoing moieties.
- the group must have at least three carbon atoms.
- cycloalkyl unless otherwise indicated, includes cyclic alkyl moieties wherein alkyl is as defined above.
- alkenyl includes alkyl moieties having at least one carbon-carbon double bond wherein alkyl is as defined above and including E and Z isomers of said alkenyl moiety.
- alkynyl includes alkyl moieties having at least one carbon-carbon triple bond wherein alkyl is as defined above.
- alkoxy includes O-alkyl groups wherein alkyl is as defined above.
- aryl includes an organic radical derived from an aromatic hydrocarbon by removal of one hydrogen, such as phenyl or naphthyl.
- Non-aromatic heterocyclic groups include groups having only 4 atoms in their ring system, but aromatic heterocyclic groups must have at least 5 atoms in their ring system.
- the heterocyclic groups include benzo-fused ring systems.
- An example of a 4 membered heterocyclic group is azetidinyl (derived from azetidine).
- An example of a 5 membered heterocyclic group is thiazolyl and an example of a 10 membered heterocyclic group is quinolinyl.
- Examples of non-aromatic heterocyclic groups are pyrrolidinyl, tetrahydrofuranyl, dihydrofuranyl, tetrahydrothienyl, tetrahydropyranyl, dihydropyranyl, tetrahydrothiopyranyl, piperidino, morpholino, thiomorpholino, thioxanyl, piperazinyl, homopiperazinyl, azetidinyl, oxetanyl, thietanyl, homopiperidinyl, oxepanyl, thiepanyl, oxazepinyl, diazepinyl, thiazepinyl, 1,2,3,6-tetrahydropyridinyl, 2-pyrrolinyl, 3-pyrroliny
- aromatic heterocyclic groups are pyridinyl, imidazolyl, pyrimidinyl, pyrazolyl, triazolyl, pyrazinyl, tetrazolyl, furyl, thienyl, isoxazolyl, thiazolyl, oxazolyl, isothiazolyl, pyrrolyl, quinolinyl, isoquinolinyl, indolyl, benzimidazolyl, benzofuranyl, cinnolinyl, indazolyl, indolizinyl, phthalazinyl, pyridazinyl, triazinyl, isoindolyl, pteridinyl, purinyl, oxadiazolyl, thiadiazolyl, furazanyl, benzofurazanyl, benzothiophenyl, benzothiazolyl, benzoxazolyl, quinazolinyl, quinox
- Spiro moieties are also included within the scope of this definition including 1-oxa-6-aza-spiro[2.5]oct-6-yl.
- the foregoing groups may be C-attached or N-attached where such is possible.
- a group derived from pyrrole may be pyrrol-1-yl (N-attached) or pyrrol-3-yl (C-attached).
- a group derived from imidazole may be imidazol-1-yl (N-attached) or imidazol-3-yl (C-attached).
- phrases “pharmaceutically acceptable salt(s)”, unless otherwise indicated, includes salts of acidic or basic groups which may be present in a compound used in the methods of the invention.
- Compounds that are basic in nature are capable of forming a wide variety of salts with various inorganic and organic acids.
- the acids that may be used to prepare pharmaceutically acceptable acid addition salts of such basic compounds are those that form non-toxic acid addition salts, i.e., salts containing pharmacologically acceptable anions, such as the acetate, benzenesulfonate, benzoate, bicarbonate, bisulfate, bitartrate, borate, bromide, calcium edetate, camsylate, carbonate, chloride, clavulanate, citrate, dihydrochloride, edetate, dislyate, estolate, esylate, ethylsuccinate, fumarate, gluceptate, gluconate, glutamate, glycollylarsanilate, hexylresorcinate, hydrabamine, hydrobromide, hydrochloride, iodide, isothionate, lactate, lactobionate, laurate, malate, maleate, mandelate, mesylate, methylsulfate, mucate,
- MC receptors are members of the seven-transmembrane-domain G protein-coupled receptor superfamily that activate generation of the second messenger cyclic AMP (cAMP). There are five MC receptors isolated to date: MC1R, MC2R, MC3R, MC4R and MC5R.
- MC2R is the receptor for adrenocorticotropic hormone (ACTH).
- ACTH adrenocorticotropic hormone
- Human MC4R is 332 amino acids in length.
- the melanocortin 4 receptor has been implicated in the regulation of body weight (Graham et al, Nat. Genetics 1997; 17: 273-4). MC4R is expressed in the brain, including the hypothalamus, which influences food intake. Signaling via MC4R stimulates anorexigenic neural pathways. MC4R null mice develop late onset obesity with hyperglycemia and hyperinsulinemia. Mice lacking one MC4R allele (heterozygotes) have intermediate body weight between wild-type and homozygous null mice. In humans, MC4R deficiency is the most common monogenic form of obesity (Farooqi et al., New Engl. J. Med .
- AgRP agouti-related protein
- an autosomal-dominant mode of inheritance of an MC4R mutation has been found to be due to a dominant-negative effect caused by receptor dimerization (Biebermann H, Krude H, Elsner A, Chubanov V, Gudermann T, Gruters A, Diabetes, 2003 December, 52(12), 2984-8).
- Loss of function is expected for MC4R with some mutations, since most of the mutations identified to date are non-conservative amino acid substitutions. This has been demonstrated for several MC4Rs found in obese individuals. In addition, a number of mutations have been associated with reduced expression of MC4R at the cell surface (Gu et al., Diabetes 1999, 48: 635-39; Nijenhuis et al., supra).
- MC4R has been implicated in binge eating.
- DSM-IV-TRTM Diagnostic and Statistical Manual of Mental Disorders-Text Revision
- binge eating involves recurrent episodes of eating an abnormally large amount of food and experiencing feelings of lack of control over the behavior.
- DSM-IV-TRTM Diagnostic and Statistical Manual of Mental Disorders-Text Revision
- Endogenous melanocortin agonists contain the sequence His-Phe-Arg-Trp, which is important for melanocortin receptor molecular recognition and stimulation.
- the molecular determinants of MC4R ligand binding were determined in one study by employing a large array of ligands (Nickolls et al., Pharmacol Exp Ther 2003; 304(3):1217-27). Molecular modeling of the receptor was used to identify Phe284, in transmembrane (TM) domain 7 (TM7), as a potential site of ligand interaction.
- MC4R agonists and antagonists include the compounds depicted in FIGS. 1-8 and 10 herein and further described in Examples 3 and 4 below.
- Natural agonists (ligands) of MC4R include ⁇ -MSH, ACTH, ⁇ -MSH, and ⁇ -MSH (in order from highest to lowest affinity).
- Other MC4R ligands, including agonists and antagonists, which have been described to date are predominantly peptides (U.S. Pat. No. 6,060,589) and cyclic peptide analogs (U.S. Pat. No. 6,613,874 to Mazur et al.).
- a series of MC4R peptide agonists have also been designed (Sun et al., Bioorg Med Chem 2004; 12(10):2671-7). In addition, Nijenhuis et al.
- MC4R antagonists are described in Grieco et al. ( J Med Chem 2002; 24:5287-94). These cyclic antagonists were designed based on the known high affinity antagonist SHU9119 (Ac-Nle4-[Asp5-His6-DNal(2′)7-Arg8-Trp9-Lys10]-NH(2)) (SEQ ID NO: 11). The SHU9119 analogues were modified in position 6 (His) with non-conventional amino acids.
- IC 50 0.51 nM
- Molecular modeling was used to examine the conformational properties of the cyclic peptides modified in position 6 with conformationally restricted amino acids. See also, Grieco et al., Peptides 2006; 27(2):472-81.
- WO 99/55679 to Basu et al. discloses isoquinoline derivatives, small molecule non-peptide compounds, which show low (micromolar) affinities for the MC1R and MC4R, reduction of dermal inflammation induced by arachidonic acids, and reductions of body weight and food intake.
- WO 99/64002 to Nargund et al. also discloses spiropiperidine derivatives as melanocortin receptor agonists, useful for the treatment of diseases and disorders such as obesity, diabetes, and sexual dysfunction.
- melanocortin antagonist agouti signaling protein was shown to have characteristics consistent with competitive antagonism observed at the hMC1R, and more complex behavior observed at the other receptors (Yang et al., Mol. Endocrinology 1997; 11(3): 274-280).
- ACTH the natural ligand for MC2R, cannot be out-competed for binding by ⁇ -, ⁇ -, or ⁇ -MSH (Abdel-Malek et al., Cell. Mol. Life Sci . 2001; 48: 434-41.
- MC4R binding compounds are described in the following: Bednarek and Fong, Exp Opn Ther Patents 2004; 14: 327-36; Ujjainwalla et al., Bioorg. Med. Chem. Lett . 2005; 15(18):4023-8; WO 03/07949 (Merck); WO 03/61660 (Eli Lilly); WO 03/09847 (Amgen); WO 03/09850 (Amgen); WO 03/31410 (Neurocrine Biosciences); WO 03/94918 (Neurocrine Biosciences); WO 03/68738 (Neurocrine Biosciences); WO 03/92690 (Procter and Gamble); WO 03/93234 (Procter and Gamble); WO 03/72056 (Chiron); WO 03/66597 (Chiron); WO 03/66587 (Chiron); WO 03/66587 (Chiron); WO 02/67869 (Merck); WO 02/68387 (Merck); WO 02/00
- MC4R peptide antagonists contemplated for use in the presently claimed methods are Ac-Cys-Glu-His-D-(2′)Nal-Arg-Trp-Gly-Cys-Pro-Pro-Lys-Asp-NH(2) (SEQ ID NO: 12); Ac-Cys-Nle-Arg-His-D-(2′)Nal-Arg-Trp-Gly-Cys-NH(2) (SEQ ID NO: 13); Ac-Cys-Glu-His-D-Phe (3,4-di-Cl)-Arg-Trp-Gly-Cys-Pro-Pro-Lys-Asp-NH(2) (SEQ ID NO: 14), Ac-Nle-c[Asp-Che-DNal(2′)-Arg-Trp-Lys-NH(2) (SEQ ID NO: 15); Ac-Nle-c[Asp-Cpe-DNal(2′)-Arg-Trp-Lys
- Peptide-based agonists and antagonists with non-naturally occurring side chains and peptidomimetics are contemplated. See e.g., U.S. Pat. No. 5,650,489; see also, U.S. Pat. No. 6,090,912, especially at Section 5.5.
- the side chains of compounds 18-20 and the side chains in the compound class depicted in FIG. 16 can be non-naturally occurring.
- MC4R has been shown to undergo ligand-mediated receptor internalization (Gao et al., J Pharmacol Exp Ther 2003; 307(3):870-7).
- Preexposure of GT1-7 cells that express endogenous MC4R to the agonist a-melanocyte-stimulating hormone ( ⁇ -MSH) resulted in impaired cAMP formation to a second challenge of ⁇ -MSH (Shinyama et al., Endocrinology 2003; 144(4):1301-14). This was not seen with administration of an antagonist.
- Ligand-induced internalization is triggered in G-protein coupled receptors by phosphorylation of serine or threonine residues between the C-terminal segment and third intracellular loop.
- chaperone that is an agonist that will reversibly bind to an MC4R polypeptide in the ER will not induce receptor internalization.
- the chaperone compound is an antagonist, it is expected that it will not inhibit receptor activity once the receptor is at the cell surface.
- the present invention also provides a method for treating a condition associated with reduced MC4R stability, such as obesity, or having risk factors for developing obesity, by administering to a subject in need of such treatment a chaperone to enhance stability and/or activity of MC4R.
- the individual to be treated can be an individual who does not exhibit a mutation in MC4R that affects folding and processing of MC4R, but who would benefit from increased MC4R stability on, e.g., neurons.
- the individual to be treated can also have a mutation in MC4R that affects folding and processing of the MC4R protein, and exhibits reduced MC4R stability on neurons.
- a specific pharmacological chaperone for MC4R i.e., an MC4R agonist or antagonist or other MC4R-binding compound as described above, or as identified through the screening methods of the invention as set forth below, is advantageously formulated in a pharmaceutical composition together with a pharmaceutically acceptable carrier.
- the chaperone may be designated as an active ingredient or therapeutic agent for the treatment of obesity or other disorder involving reduced MC4R cell surface expression or transport to the cell surface.
- the concentration of the active ingredient depends on the desired dosage and administration regimen, as discussed below.
- Exemplary dose ranges of the active ingredient are from about 0.01 mg/kg to about 250 mg/kg of body weight per day; from about 1 mg/kg to about 100 mg/kg per day; or from about 10 mg/kg to about 75 mg/kg per day.
- Therapeutically effective compounds can be provided to a subject in standard formulations, and may include any pharmaceutically acceptable additives, such as excipients, lubricants, diluents, flavorants, colorants, buffers, and disintegrants.
- Standard formulations are well known in the art. See e.g., Remington's Pharmaceutical Sciences, 20th edition, Mack Publishing Company, 2000.
- the formulation may be produced in useful dosage units for administration by any route that will permit the therapeutic chaperone to cross the blood-brain barrier.
- Exemplary routes include oral, parenteral, transmucosal, intranasal, inhalation, or transdermal routes.
- Parenteral routes include intravenous, intra-arteriolar, intramuscular, intradermal, subcutaneous, intraperitoneal, intraventricular, intrathecal, and intracranial administration.
- an MC4R pharmacological chaperone is formulated in a solid oral dosage form.
- the pharmaceutical composition may take the form of a tablet or capsule prepared by conventional means with pharmaceutically acceptable excipients such as binding agents (e.g., pregelatinized maize starch, polyvinylpyrrolidone or hydroxypropyl methylcellulose); fillers (e.g., lactose, microcrystalline cellulose or calcium hydrogen phosphate); lubricants (e.g., magnesium stearate, talc or silica); disintegrants (e.g., potato starch or sodium starch glycolate); or wetting agents (e.g., sodium lauryl sulfate).
- binding agents e.g., pregelatinized maize starch, polyvinylpyrrolidone or hydroxypropyl methylcellulose
- fillers e.g., lactose, microcrystalline cellulose or calcium hydrogen phosphate
- lubricants e.g., magnesium stearate
- Liquid preparations for oral administration may take the form of, for example, solutions, syrups or suspensions, or they may be presented as a dry product for constitution with water or other suitable vehicle before use.
- Such liquid preparations may be prepared by conventional means with pharmaceutically acceptable additives such as suspending agents (e.g., sorbitol syrup, cellulose derivatives or hydrogenated edible fats); emulsifying agents (e.g., lecithin or acacia); non-aqueous vehicles (e.g., almond oil, oily esters, ethyl alcohol or fractionated vegetable oils); and preservatives (e.g., methyl or propyl-p-hydroxybenzoates or sorbic acid).
- the preparations may also contain buffer salts, flavoring, coloring and sweetening agents as appropriate.
- an MC4R chaperone is formulated for parenteral administration.
- the chaperone may be formulated for parenteral administration by injection, e.g., by bolus injection or continuous infusion.
- Formulations for injection may be presented in unit dosage form, e.g., in ampoules or in multi-dose containers, with an added preservative.
- the compositions may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, stabilizing and/or dispersing agents.
- the active ingredient may be in powder form for constitution with a suitable vehicle, e.g., sterile pyrogen-free water, before use.
- the chaperone may also be formulated as a depot preparation.
- Such long acting formulations may be administered by implantation (for example subcutaneously or intramuscularly) or by intramuscular injection.
- the compounds may be formulated with suitable polymeric or hydrophobic materials (for example as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt.
- the chaperone can be delivered in a vesicle, particularly a liposome.
- the chaperone can be delivered in a controlled release manner.
- a therapeutic agent can be administered using intravenous infusion with a continuous pump, in a polymer matrix such as poly-lactic/glutamic acid (PLGA), in a pellet containing a mixture of cholesterol and the active ingredient (SilasticRTM; Dow Coming, Midland, Mich.; see U.S. Pat. No. 5,554,601), by subcutaneous implantation, or by transdermal patch.
- PLGA poly-lactic/glutamic acid
- SilasticRTM Dow Coming, Midland, Mich.; see U.S. Pat. No. 5,554,601
- the pharmaceutical composition may also include other biologically active substances in combination with the candidate compound.
- examples include but are not limited to sibutramine, orlistat (Xenical®), leptin, neuropeptide Y, cholecystokinin, or GLP-1.
- the present invention further provides a method for identifying a candidate chaperone compound that modulates the stability, activity, and/or cell surface localization of an MC4R polypeptide.
- the present invention provides a method for identifying a chaperone for the MC4R protein, which comprises bringing a labeled or unlabeled test compound in contact with the MC4R protein or a fragment thereof and measuring the amount of the test compound bound to the MC4R protein or to the fragment thereof. This can be achieved for example as follows:
- step (b) determining the conformational stability, activity, and/or cell surface localization of a MC4R polypeptide (or a fragment thereof comprising a ligand binding domain) in the cell (or on the cell surface) contacted in step (a);
- step (c) comparing the stability, activity, and/or cell surface localization of the MC4R polypeptide determined in step (b) to that of an MC4R polypeptide in a control cell that has not been contacted with the test compound;
- a detectable change in the stability, activity, and/or cell surface localization of the MC4R polypeptide in the first cell in response to contact with the test compound compared to the stability level of the MC4R polypeptide in the control cell that has not been contacted with the test compound indicates that the test compound modulates the stability of the MC4R polypeptide and is a candidate compound for the treatment of a disorder associated with reduced MC4R stability or activity.
- the cell can either be a host cell transformed with a non-endogenous wild-type or mutant MC4R, or an endogenously-MC4R-expressing cell, including mutant and wild-type MC4Rs.
- Such cells include the “obesity neurons” such as GT1-7 cells, described above, those described in MacKenzie et al., Current Medicinal Chemistry—Immunology, Endocrine & Metabolic Agents 2004; 4: 113-117, which endogenously express MC4R, or transformed cells expressing normal or mutated, tagged MC4R such as the HEK293 cells described in Blondet et al., J Biochem 2004; 135: 541-546 and below in the Examples.
- the present invention provides a method for identifying a chaperone for the MC4R protein, which comprises bringing a labeled test compound in contact with cells or a cell membrane fraction containing the MC4R protein, and measuring the amount of the labeled test compound bound to the cells or the cell membrane fraction.
- test compounds can be, without limitation, a small organic or inorganic molecule (preferred), a peptide or a polypeptide (including an antibody, antibody fragment, or other immunospecific molecule), an oligonucleotide molecule (such as an aptamer), a polynucleotide molecule, or a chimera or derivative thereof.
- Test compounds which are candidate chaperones that specifically bind to an MC4R polypeptide can be identified using cell-based and/or cell-free assays.
- purified classes of compounds that may be identified include, but are not limited to, small molecules (i.e., organic or inorganic molecules which are less than about 2 kilodaltons (kD) in molecular weight, and, more preferably, less than about 1 kD in molecular weight). These are components of compound libraries.
- small molecules i.e., organic or inorganic molecules which are less than about 2 kilodaltons (kD) in molecular weight, and, more preferably, less than about 1 kD in molecular weight.
- the term “lead compound” refers to a molecular entity selected from a primary screen of MC4R antagonists or agonists which may be effective on its own in stabilizing protein conformation of wild-type or mutant MC4R protein, or which may be modified by further development to generate an appropriate pharmaceutical compound.
- ICCB Institute of Chemistry and Cell Biology
- Chem Bridge DiverSet E (16,320 compounds); Bionet I (4,800 compounds); CEREP (4,800 compounds); Maybridge 1 (8,800 compounds); Maybridge 2 (704 compounds); Peakdale 1 (2,816 compounds); Peakdale 2 (352 compounds); ChemDiv Combilab and International (28,864 compounds); Mixed Commercial Plate 1 (352 compounds); Mixed Commercial Plate 2 (320 compounds); Mixed Commercial Plate 3 (251 compounds); Mixed Commercial Plate 4 (331 compounds); ChemBridge Microformat (50,000 compounds); Commercial Diversity Set 1 (5,056 compounds); NCI Collections: Structural Diversity Set, version 2 (1,900 compounds); Mechanistic Diversity Set (879 compounds); Open Collection 1 (90,000 compounds); Open Collection 2 (10,240 compounds); Known Bioactives Collections: NINDS Custom Collection (1,040 compounds); ICCB Bioactives 1 (489 compounds); SpecPlus Collection (960 compounds); ICCB Discretes Collections.
- ICCB1 190 compounds
- ICCB2 352 compounds
- ICCB3 352 compounds
- ICCB4 352 compounds
- Natural Product Extracts NCI Marine Extracts (352 wells); Organic fractions—NCI Plant and Fungal Extracts (1,408 wells); Philippines Plant Extracts 1 (200 wells); ICCB-ICG Diversity Oriented Synthesis (DOS) Collections; DDS1 (DOS Diversity Set) (9600 wells).
- ArQule, Inc. (Woburn, Mass.) also has integrated technologies to perform high-throughput, automated production of chemical compounds and to deliver these compounds of known structure and high purity in sufficient quantities for lead optimization. Its AMAPTM (Automated Molecular Assembly Plant) performs high-throughput chemical syntheses for each phase of compound discovery.
- HTS screening for MC4R chaperones employs microarrays.
- Protein arrays are solid-phase, binding assay systems using immobilized proteins on various surfaces that are selected for example from glass, membranes, microtiter wells, mass spectrometer plates, and beads or other particles.
- the binding assays using these arrays are highly parallel and often miniaturized. Their advantages are that they are rapid, can be automated, are capable of high sensitivity, are economical in their use of reagents, and provide an abundance of data from a single experiment.
- Automated multi-well formats are the best-developed HTS systems. Automated 96- or 384-well plate-based screening systems are the most widely used. The current trend in plate-based screening systems is to reduce the volume of the reaction wells even further, and increase the density of the wells per plate (96 wells to 384 wells to 1,536 wells per plate). The trend results in increased throughput, dramatically decreased bioreagent costs per compound screened, and a decrease in the number of plates that need to be managed by automation.
- protein arrays that can be used for HTS, see e.g.: U.S. Pat. Nos. 6,475,809; 6,406,921; and 6,197,599; and International Publication Nos. WO 00/04389 and WO 00/07024.
- sources of MC4Rs or fragments thereof can include cell-based expression systems for recombinant proteins, purification from natural sources, production in vitro by cell-free translation systems, and synthetic methods for making MC4R peptides.
- MC4R polypeptides are correctly folded and functional. This is not always the case, e.g., where recombinant proteins are extracted from bacteria under denaturing conditions; other methods (isolation of natural proteins, cell free synthesis) generally retain functionality.
- arrays of denatured proteins can still be useful in screening chaperones since the chaperone will likely bind to the mutated protein while it is not folded into its proper conformation.
- the immobilization method used is preferably applicable to MC4R polypeptides of different properties (e.g., wild-type, mutant, full-length, partial-length fragments, hydrophilic, hydrophobic, etc.), amenable to high throughput and automation, and generally compatible with retention of chaperone-binding ability. Both covalent or non-covalent methods of MC4R protein immobilization can be used.
- Substrates for covalent attachment include, e.g., glass slides coated with amino- or aldehyde containing silane reagents (Telechem).
- reversible covalent coupling is achieved by interaction between the protein derivatized with phenyldiboronic acid, and salicylhydroxamic acid immobilized on the support surface.
- Covalent coupling methods providing a stable linkage can be applied to a range of proteins.
- Non-covalent binding of unmodified protein occurs within porous structures such as HydroGelTM (PerkinElmer), based on a 3-dimensional polyacrylamide gel.
- Cell-Based Arrays combine the technique of cell culture in conjunction with the use of fluidic devices for measurement of cell response to test compounds in a sample of interest, screening of samples for identifying molecules that induce a desired effect in cultured cells, and selection and identification of cell populations with novel and desired characteristics.
- High-throughput screening can be performed on fixed cells using fluorescent-labeled antibodies, biological ligands or candidate chaperones and/or nucleic acid hybridization probes, or on live cells using multicolor fluorescent indicators and biosensors. The choice of fixed or live cell screens depends on the specific cell-based assay required.
- Transfected cell microarrays are a complementary technique in which array features comprise clusters of cells overexpressing defined cDNAs. Complementary DNAs cloned in expression vectors are printed on microscope slides, which become living arrays after the addition of a lipid transfection reagent and adherent mammalian cells (Bailey et al., Drug Discov. Today 2002; 7(18 Suppl): S113-8).
- Cell-based arrays are described in detail in, e.g., Beske, Drug Discov. Today 2002; 7(18 Suppl): S131-5; Sundberg et al., Curr. Opin. Biotechnol . 2000; 11: 47-53; Johnston et al., Drug Discov. Today 2002; 7: 353-63; U.S. Pat. Nos. 6,406,840 and 6,103,479, and U.S. published patent application no. 2002/0197656.
- Detectable labels For detection of molecules such as candidate MC4R chaperones using screening assays, a functional assay can be used to follow unlabeled molecules as described elsewhere herein.
- a molecule-of-interest e.g., a small molecule, an antibody, or a polynucleotide probe
- a library of same can also be detectably labeled with an atom (e.g., a radionuclide), a detectable molecule (e.g., fluorescein), or a complex that, due to a physical or chemical property, serves to indicate the presence of the molecule of interest.
- an atom e.g., a radionuclide
- a detectable molecule e.g., fluorescein
- a complex that, due to a physical or chemical property, serves to indicate the presence of the molecule of interest.
- a molecule can also be detectably labeled when it is covalently bound to a “reporter” molecule (e.g., a biomolecule such as an enzyme) that acts on a substrate to produce a detectable product.
- reporter molecules e.g., a biomolecule such as an enzyme
- Detectable labels suitable for use in the present invention include any composition detectable by spectroscopic, photochemical, biochemical, immunochemical, electrical, optical or chemical means.
- Labels useful in the present invention include, but are not limited to, biotin for staining with labeled avidin or streptavidin conjugate, magnetic beads (e.g., DynabeadsTM), fluorescent dyes (e.g., fluorescein, fluorescein-isothiocyanate (FITC), Texas red, rhodamine, green fluorescent protein, enhanced green fluorescent protein, lissamine, phycoerythrin, Cy2, Cy3, Cy3.5, Cy5, Cy5.5, Cy7, FluorX from Amersham, SyBR Green I & II from Molecular Probes, and the like), radiolabels (e.g., 3 H, 125 I, 35 S, 14 C, or 32 P), enzymes (e.g., hydrolases, particularly phosphatases such as alkaline phosphatase, esterases and glycosidases, or oxidoreductases, particularly peroxidases such as horse radish peroxidase, and the like), substrates, cofactor
- radiolabels and chemiluminescent labels can be detected using photographic film or scintillation counters; fluorescent markers can be detected using a photo-detector to detect emitted light (e.g., as in fluorescence-activated cell sorting, FACS); and enzymatic labels can be detected by providing the enzyme with a substrate and detecting, e.g., a colored reaction product produced by the action of the enzyme on the substrate.
- enhanced stability of MC4R can be determined by measuring an increase in cellular MC4R polypeptide, by determining an increase in trafficking to the cell surface, e.g., as determined by increased cell surface expression, or by determining increased MC4R activity.
- Non-limiting exemplary methods for assessing each of the foregoing are described below.
- MC4R intracellular stability Determining MC4R intracellular stability.
- Methods for determining intracellular MC4R protein levels are well-known in the art. Such methods include Western blotting, immunoprecipitation followed by Western blotting (IP Western), or immunofluorescence using a tagged MC4R protein.
- Determining MC4R trafficking Assessing trafficking of proteins through the biosynthetic pathway can be achieved e.g., using pulse-chase experiments with 35 S-labeled receptor protein, in conjunction with glycosidases; or by indirect or direct immunofluorescence to determine protein modification during trafficking. These and other methods are described for example in Current Protocols in Cell Biology 2001; John Wiley & Sons.
- Sensitive methods for visually detecting cellular localization also include fluorescent microscopy using fluorescent proteins or fluorescent antibodies.
- MC4R proteins of interest can be tagged with e.g., green fluorescent protein (GFP), cyan fluorescent protein, yellow fluorescent protein, and red fluorescent protein, followed by multicolor and time-lapse microscopy and electron microscopy to study the fate of these proteins in fixed cells and in living cells.
- GFP green fluorescent protein
- cyan fluorescent protein cyan fluorescent protein
- yellow fluorescent protein cyan fluorescent protein
- red fluorescent protein followed by multicolor and time-lapse microscopy and electron microscopy to study the fate of these proteins in fixed cells and in living cells.
- Fluorescence correlation spectroscopy is an ultrasensitive and non-invasive detection method capable of single-molecule and real-time resolution (Vukojevic et al., Cell Mol Life Sci 2005; 62(5): 535-50).
- SPFI single-particle fluorescence imaging
- fluorescent particles Cholery et al., Biochem Soc Trans 2003; 31(Pt 5): 1028-31).
- For localization of proteins within lipid rafts see Latif et al., Endocrinology 2003; 144(11): 4725-8).
- live cell imaging see Hariguchi, Cell Struct Funct 2002; 27(5):333-4).
- Fluorescence resonance energy transfer (FRET) microscopy is also used to study the structure and localization of proteins under physiological conditions (Periasamy, J Biomed Opt 2001; 6(3): 287-91).
- less sensitive assays can be used to detect whether they are present on the membrane.
- Such methods include immunohisto-chemistry of fixed cells, or whole-cell labeling using radiolabeled ligand (e.g., 125 I).
- MC4R cell surface expression Determining MC4R cell surface expression. Once a candidate compound has been identified, the next step is determining whether the candidate compound can enhance the amount of MC4R trafficked to the cell surface.
- Numerous assays can be used to evaluate cell surface receptor expression quantitatively. For example, radioactive ligand binding assays, using e.g., 125 I-MSH, can be used to determine binding to either whole cells expressing MC4R or to cell membrane fractions. See U.S. published application 2003/0176425 for a description of one exemplary method; see also Chhajlani, Peptides . 1996; 17(2):349-51.
- immunofluorescence staining using either labeled antibodies or labeled MC4R (e.g., FLAG-tagged MC4R), may also be used.
- labeled antibodies or labeled MC4R e.g., FLAG-tagged MC4R
- FACS fluorescence-activated cell sorting
- MC4R activity can be determined using, e.g., cAMP activation/accumulation assays (see e.g., VanLeeuwen et al., J Biol Chem 2003; 18: 15935-40) or by measuring an increase in transcription of one or more genes activated by cAMP, or by measuring reporter gene expression by operatively linking a reporter gene such as luciferase to a cAMP response element (CRE) (see e.g., Lee et al., Eur J Biochem 2001; 268(3):582-91).
- CRE cAMP response element
- MC4R stimulates TNF- ⁇ secretion in melanophores. Therefore, MC4R activity in response to a candidate compound can be evaluated by measuring TNF- ⁇ secretion (see e.g., Ignar et al., Peptides 2003 May; 24(5):709-16).
- melanophores provide a rapid and sensitive bioassay for melanocortin agonists and antagonists. This method is based on the measurement of pigment granule dispersion induced by ⁇ -MSH, as determined by changes in optical density (Quillan et al., PNAS U.S.A. 1995; 92: 2894; and Potenza et al., Pigment Cell Res 1992; 5: 372).
- host cell means any cell of any organism that is selected, modified, transformed, grown, used, or manipulated in any way, for the production of a desired substance by the cell, for example the expression by the cell of a gene, a DNA or RNA sequence, a protein, or an enzyme. According to the present invention, the host cell is modified to express a mutant or wild-type MC4R nucleic acid and polypeptide. Host cells can further be used for screening or other assays. Exemplary host cells for use in the present invention are HEK293 cells, COS cells, and CHO cells.
- a “recombinant DNA molecule” is a DNA molecule that has undergone a molecular biological manipulation.
- the MC4R polynucleotides herein may be flanked by natural regulatory (expression control) sequences, or may be associated with heterologous sequences, including promoters, internal ribosome entry sites (IRES) and other ribosome binding site sequences, enhancers, response elements, suppressors, signal sequences, polyadenylation sequences, introns, 5′- and 3′-non-coding regions, and the like.
- the nucleic acids may also be modified by many means known in the art.
- Non-limiting examples of such modifications include: methylation, “caps,” substitution of one or more of the naturally occurring nucleotides with an analog, and internucleotide modifications such as, for example, those with uncharged linkages (e.g., methyl phosphonates, phosphotriesters, phosphoroamidates, carbamates, etc.) and with charged linkages (e.g., phosphorothioates, phosphorodithioates, etc.).
- uncharged linkages e.g., methyl phosphonates, phosphotriesters, phosphoroamidates, carbamates, etc.
- charged linkages e.g., phosphorothioates, phosphorodithioates, etc.
- Polynucleotides may contain one or more additional covalently linked moieties, such as, for example, proteins (e.g., nucleases, toxins, antibodies, signal peptides, poly-L-lysine, etc.), intercalators (e.g., acridine, psoralen, etc.), chelators (e.g., metals, radioactive metals, iron, oxidative metals, etc.), and alkylators.
- the polynucleotides may be derivatized by formation of a methyl or ethyl phosphotriester or an alkyl phosphoramidate linkage.
- polynucleotides herein may also be modified with a label capable of providing a detectable signal, either directly or indirectly.
- exemplary labels include radioisotopes, fluorescent molecules, biotin, and the like.
- the nucleic acids may also be altered at one or more bases by e.g., site-directed mutagenesis to facilitate molecular biology associated with use of the molecules.
- a “coding sequence” or a sequence “encoding” an expression product, such as an MC4R RNA or polypeptide is a nucleotide sequence that, when expressed, results in the production of that RNA or polypeptide, e.g., the MC4R nucleotide sequence encodes an amino acid sequence for an MC4R polypeptide (protein).
- a coding sequence for the protein may include a start codon (usually ATG) and a stop codon.
- gene also called a “structural gene” means a DNA sequence that codes for or corresponds to a particular sequence of amino acids which comprise all or part of one or more MC4R proteins, and may or may not include regulatory DNA sequences, such as promoter sequences, which determine for example the conditions under which the MC4R gene is expressed.
- express when used in the context of producing an amino acid sequence from a nucleic acid sequence, means allowing or causing the information in a MC4R gene or DNA sequence to become manifest, for example producing an MC4R protein by activating the cellular functions involved in transcription and translation of the corresponding MC4R gene or DNA sequence.
- a DNA sequence is expressed in or by a cell to form an “expression product” such as an MC4R protein.
- the expression product itself, e.g., the resulting protein may also be said to be “expressed” by the cell.
- An expression product can be characterized as intracellular, extracellular or secreted.
- MC4R is expressed at the cell surface of neurons.
- intracellular means something that is inside a cell.
- extracellular means something that is outside a cell.
- a substance is “secreted” by a cell if it appears in significant measure outside the cell, from somewhere on or inside the cell.
- heterologous refers to a combination of elements not naturally occurring in combination.
- heterologous DNA refers to DNA not naturally located in the cell, or in a chromosomal site of the cell.
- the heterologous DNA includes a gene foreign to the cell.
- a heterologous expression regulatory element is an element operatively associated with a different gene than the one it is operatively associated with in nature.
- a gene encoding a protein of interest is heterologous to the vector DNA in which it is inserted for cloning or expression, and it is heterologous to a host cell containing such a vector, in which it is expressed, e.g., an E. coli cell.
- transformation refers to the process by which DNA, i.e., a nucleic acid encoding an MC4R polypeptide, is introduced from the surrounding medium into a host cell.
- transduction refers to the introduction of DNA, i.e., a nucleic acid encoding an MC4R polypeptide, into a prokaryotic host cell, e.g., into a prokaryotic host cell via a bacterial virus, or bacteriophage.
- a prokaryotic or eukaryotic host cell that receives and expresses introduced DNA or RNA has been “transformed” or “transduced” and is a “transformant” or a “clone.”
- the DNA or RNA introduced into a host cell can come from any source, including cells of the same genus or species as the host cell, or cells of a different genus or species, or synthetic sequences.
- recombinantly engineered cell refers to any prokaryotic or eukaryotic cell that has been manipulated to express or overexpress the nucleic acid of interest, i.e., a nucleic acid encoding an MC4R polypeptide, by any appropriate method, including transfection, transformation or transduction. This term also includes endogenous activation of a nucleic acid in a cell that does not normally express that gene product or that expresses the gene product at a sub-optimal level.
- the term “transfection” means the introduction of a foreign (i.e., extrinsic or extracellular) nucleic acid into a cell.
- the “foreign” nucleic acid includes a gene, DNA or RNA sequence to a host cell, so that the host cell will replicate the DNA and express the introduced gene or sequence to produce a desired substance, typically a protein or enzyme coded by the introduced gene or sequence.
- the introduced gene i.e., a nucleic acid encoding an MC4R polypeptide, or sequence may also be called a “cloned” gene or sequence, may include regulatory or control sequences, such as start, stop, promoter, signal, secretion, or other sequences used by a cell's genetic machinery.
- the gene or sequence may include nonfunctional sequences or sequences with no known function.
- DNA may be introduced either as an extrachromosomal element or by chromosomal integration or a host cell that receives and expresses introduced DNA or RNA.
- transformation or transfection is done using standard techniques appropriate to such cells.
- the calcium treatment employing calcium chloride as described in section 1.82 of Sambrook et al., 1989 supra, is generally used for bacterial cells that contain substantial cell-wall barriers.
- Another method for transformation employs polyethylene glycol/DMSO, as described in Chung and Miller ( Nucleic Acids Res . 1988, 16:3580).
- Yet another method is the use of the technique termed electroporation.
- the host cells can be infected by the virus containing the gene of interest.
- vector means the vehicle by which a DNA or RNA sequence (e.g., an MC4R gene) can be introduced into a host cell, so as to transform the host and promote expression (e.g., transcription and translation) of the introduced sequence.
- vectors include plasmids, phages, viruses, etc.; they are well known in the art.
- a “promoter sequence” is a DNA regulatory region capable of binding RNA polymerase in a cell and initiating transcription of a downstream (3′ direction) coding sequence.
- the promoter sequence is bounded at its 3′ terminus by the transcription initiation site and extends upstream (5′ direction) to include the minimum number of bases or elements necessary to initiate transcription at levels detectable above background.
- a transcription initiation site as well as protein binding domains (consensus sequences) responsible for the binding of RNA polymerase.
- a coding sequence is “under the control of” or “operatively associated with” transcriptional and translational control sequences in a cell when RNA polymerase transcribes the coding sequence into mRNA, which is then trans-RNA spliced (if it contains introns) and translated into the protein encoded by the coding sequence.
- Plasmids containing one or more of the above listed components employs standard ligation techniques. Isolated plasmids or DNA fragments are cleaved, tailored, and religated in the form desired to generate the plasmids required.
- the ligation mixtures are used to transform bacterial strains, and successful transformants are selected by ampicillin or tetracycline resistance where appropriate. Plasmids from the transformants are prepared, analyzed by restriction endonuclease digestion, and/or sequenced by the method of Sanger et al. (Proc. Natl. Acad. Sci. USA 1977, 74:5463-5467) or Messing et al. (Nucleic Acids Res. 1981, 9:309), or by the method of Maxam et al. (Methods in Enzymology 1980, 65:499). Host cells are transformed with the above-described expression vectors of this invention and cultured in conventional nutrient media modified as appropriate for the promoter utilized.
- MC4R nucleic acids containing the various mutants are transfected into HEK-293T and COS-7 cells and their cell surface expression and activity evaluated. Those cell lines in which reduced or absent cell surface expression is observed are evaluated further to determine the intracellular presence and/or location of the MC4R polypeptide.
- a cDNA encoding a wild-type MC4R (e.g., SEQ ID NO: 1) is modified using known techniques in the art (e.g., PCR, site-directed mutagenesis) to generate mutant MC4R cDNAs containing alterations in the nucleotides which result in, e.g., one of the following MC4R mutant polypeptides: P78L, R165Q, R165W, 1125K, C271Y, T11A, A175T, I316L, I316S, I317T, N97D, G98R, N62S, C271R, S58C, N62S, N97D, Y157S, I102S, L106P, L250Q, Y287X, P299H, S58C, CTCT at codon 211, and/or TGAT insertion at codon 244.
- Such mutants can also be fused to a fluorescent tag, such as GFP, as described in Blondet et al. J Biochem (Tokyo) 2004; 135(4):541-6, or FLAG-tagged, as described by VanLeeuwen et al., J. Biol. Chem . 2003; 278: 15935-15940, or tagged-with an enzyme such as luciferase. .
- a fluorescent tag such as GFP, as described in Blondet et al. J Biochem (Tokyo) 2004; 135(4):541-6
- FLAG-tagged as described by VanLeeuwen et al., J. Biol. Chem . 2003; 278: 15935-15940
- an enzyme such as luciferase. .
- MC4R nucleic acids are cloned into an appropriate expression vector, e.g., pCDNA3.1 (Invitrogen, Carlsbad, Calif.), according to the manufacturer's instructions. Transfection of cells is accomplished using LipofectAMINE (Invitrogen), and permanently transfected clonal cell lines are selected by resistance to the neomycin analog G418.
- an appropriate expression vector e.g., pCDNA3.1 (Invitrogen, Carlsbad, Calif.)
- LipofectAMINE Invitrogen
- permanently transfected clonal cell lines are selected by resistance to the neomycin analog G418.
- HEK-293T and COS-7 cells are maintained in Dulbecco's modified Eagle's medium (with glutamine; Invitrogen) supplemented with 10% fetal bovine serum, 100 units/ml penicillin, and 100 ⁇ g/ml streptomycin (Invitrogen). Cells are incubated at 37° C. in humidified air containing 5% CO2. Cells are generally at 70-80% confluence on the day of transfection.
- GFP Tagged MC4R Green fluorescent protein (GFP) cDNA is available from BD Biosciences (San Jose, Calif.) or Clontech (Palo Alto, Calif.). GFP is fused in frame to the C terminus of human MC4R with the C-terminal termination codon removed, according to the manufacturer's instructions. The chimeric MC4R-GFP fusion protein construct is then transfected as above. A luciferase construct is similarly employed.
- GFP Green fluorescent protein
- Binding experiments to determine cell surface localization are performed using conditions described previously (Yang et al., J Biol Chem 1997; 272: 23000-23010). Briefly, 2 ⁇ 10 5 cpm of 125 I-NDP-MSH (Amersham Biosciences, Piscataway, N.J.) is used in combination with non-radiolabeled ligands NDP-MSH, AgRP 87-132, or AgRP 110-117. Binding reactions are terminated by removing the media and washing the cells twice with minimal essential medium containing 0.2% bovine serum albumin.
- the cells are then lysed with 0.2 N NaOH, and the radioactivity in the lysate is quantified in an analytical-counter.
- Nonspecific binding is determined by measuring the amount of 125 I label bound in the presence of 10 ⁇ 6 M unlabeled ligand. Additional, FACS can be used as described below in Example 4. Specific binding is calculated by subtracting nonspecifically bound radioactivity from total bound radioactivity.
- confocal microscopy is used to monitor intracellular trafficking of tagged MC4R (Blondet et al., J Biochem 2004; 135: 541-546; or Gao et al., J Pharmacol Exp Ther 2003; 307(3):870-7). Briefly, cells are grown in chamber coverglasses 24 to 48 h before the experiments. After appropriate treatments, cells are washed with cold PBS and fixed in formalin for 20 minutes, and observed on an LSM 510 META laser scanning microscope (Carl Zeiss, Thornwood, N.Y.).
- Fluorescence of GFP is excited using a 488-nm argon/krypton laser, detected with a band pass filter of 500 to 550 nm. Red signal is excited with a HeNe laser at 543 nm and fluorescence is detected with a 565 to 615 band pass filter.
- the digitally-acquired images are quantitated using a Scion Image Beta 4.02.
- the original green fluorescence confocal images are converted to grayscale and median filtering is performed. Each pixel is assigned an intensity value ranging from 0 (black) to 255 (white).
- the cell surface and total cellular fluorescence intensity are measured after manually selecting the corresponding area.
- the subcellular distribution of MC4R-GFP is expressed as a ratio of cell surface fluorescence intensity to total cellular fluorescence intensity. A decrease in the ratio indicates receptor internalization.
- folding mutants of MC4R are identified that would be candidates for chaperone-mediated rescue.
- MC4R Potential agonists and antagonists of MC4R were selected based on the review of published patent and literature references (in particular, Bednarek and Fong, Exp. Opn. Therapeutic Patents 2004; 14(3): 327-326 and WO 02/062766). Criteria used in selecting the compounds described herein included published IC 50 data, in vivo animal data, and bioavailability data (e.g., pharmacokinetics), where available.
- THIQ THIQ Selection of this compound, known as THIQ, was based on the following data: MC4R Activity IC 50 EC 50 E max Name (nM) (nM) (%) PK Reference(s) THIQ/ 1.2 2.5 97 % F 14 Van der Ploeg et al (2002) compound 1 V d 3.6 L/kg PNAS 99: 11381. Cl 84 mLmin/kg Sebhat et al (2002) J Med t 1/2 0.6 h Chem 45: 4589.
- This compound was selected and synthesized based on the data and synthetic method described in PCT International Patent Publication WO 02/062766 to Millennium Pharmaceuticals; the synthetic scheme is summarized in FIG. 8 .
- the biological activity of this compound is reported in WO 02/062766 using a scintillation proximity assay.
- 1,3-diaminopropane (Acros, 27.7 g, 0.374 mmol) is added to thiosalicylic acid (Acros, 20 g, 0.130 mmol) in 1,2-dichlorobenzene (Acros, 200 ml), this mixture is heated to 170° C. for 4 hours. On cooling to 60° C., methanol (50 ml) is added, the reaction stirs at room temperature overnight and the resulting yellow crystalline solid collected and washed with ether to give 9 g of pure product.
- HEK 293 cells were transiently transfected with wild-type (WT) or the following hMC4R mutants double tagged with 3HA and Venus (Enhanced Yellow Green Fluorescent Protein; EYFP): S58C; N62S; R165W; R165Q, and P299H.
- WT wild-type
- EYFP Enhanced Yellow Green Fluorescent Protein
- FACS Analysis FACS analysis was performed after fluorescently labeling cells with primary anti-HA.11 antibody (mouse; 1;1000 dilution) and the secondary antibody coupled to Alexa 647 (goat anti-mouse; 1:1000 dilution) dilution. Live cells (propidium iodide negative) were sorted into the following two relevant populations:
- MC4R Cell Surface Expression Basal surface expression of WT cell surface expression reaches 90%. None of the mutants expressed MC4R on the cell surface as detected by binding of 125 I-labeled NDP- ⁇ -MSH (data not shown). When analyzed by FACS, the mutants all exhibited significantly decreased surface expression when compared to cells transfected with WT MC4R (data not shown). About 90% of the WT 3HA-hMC4R-Venus cells exhibited surface expression of MC4R (P5), whereas basal surface expression on the mutants was between 12% and 18% for N62S, R165W, R165Q and P299H. S58C exhibits about 40% surface expression.
- the MC4R antagonist compounds depicted in FIG. 5 (compound 3) and FIG. 6 (HBr salt; compound 4), respectively were evaluated for chaperone activity in cells harboring the following MC4R mutants: S58C; N62S; R165Q; R165W; and P299H.
- MC4R Activity Assay Accumulation of cAMP was evaluated for MC4R mutants S58C, N62S, R165W and P299H in response to treatment with MC4R agonist NDP-MSH (10-7M) in the presence or absence of each antagonist using the Catch Point cAMP Fluorescent Assay Kit from Molecular Devices (whole cell assay; Cat. No. R8044). Controls were untreated or treated only with NDP-MSH.
- mutant N62S no effect was seen at 1.0 ⁇ M with either of the compounds, although a significant percent gain in cell surface expression of the mutant MC4R was observed with both compounds at the 10 ⁇ M concentration.
- the compound depicted in FIG. 5 was more potent, i.e., more cell surface expression was observed than with the compound shown in FIG. 6 .
- MC4R Activity As shown in FIG. 11 , recovery of signaling through MC4R was observed to the same extent as hMC4R WT in S58C and R165W following treatment with both antagonists at 10 ⁇ M. Signaling capacity in MC4R mutant N62S also was restored to a lesser extent. No signaling was restored in P299H, as expected, since this mutant since this mutation is in a domain necessary for G-protein coupling.
- This example describes a method for screening for MC4R chaperone compounds for enhancing misfolded mutant or wild-type cell surface expression and/or activity of MC4R.
- Transfection of Mutant or Wild-type MC4R Identification of folding/trafficking MC4R mutants is achieved as described in Example 1. Transfection of such folding mutants and/or wild-type MC4R is achieved as described above, or by using any methods known in the art for detecting cell surface expression of proteins, including immunoassays such as ELISA, and FACS analysis.
- MC4R wild-type-expressing or folding-mutant-expressing cells are added various concentrations of chaperone test compounds.
- the cellular localization of MC4R is then determined, in addition to the activity of the MC4R that is trafficked to the cell surface.
- piperazine-, piperidine-, 1,4-diazapane-, guanidine-based, or other test compounds as described e.g., in the following are screened: Bednarek and Fong, Exp Opn Ther Patents 2004; 14: 327-36; Ujjainwalla et al., Bioorg. Med. Chem. Lett .
- Detection of Trafficking of MC4R to the Cell Surface Detection of cellular and/or cell surface localization of compound-treated MC4R-expressing cells compared to untreated cells is achieved as described above.
- MC4R Activity by Measuring cAMP Accumulation. 48 h after transfection, cells are washed once with PBS and then detached from the plate with PBS containing 0.02% EDTA (Sigma). The detached cells are harvested by centrifugation and resuspended in Hanks' balanced salt solution (Invitrogen) containing 0.5 mM IBMX, 2 mM HEPES, pH 7.5 (IBMX buffer). After incubation at 37° C.
- Hanks' balanced salt solution Invitrogen
- EC 50 values are calculated with a 95% confidence interval using GraphPad Prism software (using nonlinear regression analysis fitted with a sigmoidal dose-response curve with variable slope).
- This example describes a randomized, double blind, placebo controlled Phase I study of twice daily oral doses of DGJ to evaluate the safety, tolerability, pharmacokinetics, and ⁇ -Galatosidase A ( ⁇ -Gal A) enzymantic activity effects of DGJ in healthy volunteers.
- Study Design and Duration This study was first-in-man, single-center, Phase I, randomized, double-blind, twice-daily dose, placebo-controlled study to evaluate the safety, tolerability, pharmacokinetics, and ⁇ -Gal A enzymantic activity effects of DGJ following oral administration.
- the study tested two groups of 8 subjects (6 active and 2 placebo) who received a twice-daily dose of 50 or 150 mg of DGJ or placebo administered orally for seven consecutive days, accompanied by a seven day follow up visit. Subjects were housed in the treatment facility from 14 hours prior to dosing until 24 hours after dosing. Meals were controlled by schedule and subjects remained abulatory for 4 hours post drug administration.
- Safety and Tolerability Assessments were determined by evaluating vital signs, laboratory parameters (serum chemistry, hematology, and urinalysis), ECGs, physical examination and by recording adverse events during the Treatment Period.
- WBC ⁇ -GAL A Enzymatic Activity Sampling Blood samples (10 mL each) were collected in blood collection tubes containing EDTA and WBC extracted before dosing and at the following times thereafter: 100 hours, 150 hours, and 336 hours. Samples were treated as described above, and WBC ⁇ -Gal A enzymatic activity levels were determined.
- Safety data including laboratory evaluations, physical exams, adverse events, ECG monitoring and vital signs assessments were summarized by treatment group and point of time of collection. Descriptive statistics (arithmetic mean, standard deviation, median, minimum and maximum) were calculated for quantitative safety data as well as for the difference to baseline. Frequency counts were compiled for classification of qualitative safety data.
- Adverse events were coded using the MedDRA version 7.0 dictionary and summarized by treatment for the number of subjects reporting the adverse event and the number of adverse events reported. A by-subject adverse event data listing including verbatim term, coded term, treatment group, severity, and relationship to treatment was provided. Concomitant medications and medical history were listed by treatment.
- Pharmacokinetic parameters were summarised by treatment group using descriptive statistics (arithmetic means, standard deviations, coefficients of variation, sample size, minimum, maximum and median).
- the mean percentage of DGJ excreted over the 12-hour post dose period was 16% and 42% at dose levels of 50 mg and 150 mg, respectively, on Day 1, increasing to 48% and 60%, respectively, on Day 7.
- ⁇ -Galactosidase A ( ⁇ -Gal A) enzymatic Activity.
- the ⁇ -Gal A enzymatic activity data obtained during the study is shown in FIG. 1 .
- DGJ did not inhibit WBC ⁇ -Gal A enzymatic activity in subjects at dosages of 50 mg b.i.d. or 150 mg b.i.d.
- DGJ produced a dose-dependent trend of increased WBC ⁇ -Gal A activity in healthy volunteers.
- ⁇ -Gal A enzymatic activity was measured in WBC of subjects administered placebo, 50 mg b.i.d., and 150 mg b.i.d. DGJ. Placebo had no effect on WBC ⁇ -Gal A enzymatic activity.
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- 2006-06-02 US US11/446,429 patent/US20070021433A1/en not_active Abandoned
- 2006-06-05 EP EP06772163.9A patent/EP1885366B1/de not_active Not-in-force
- 2006-06-05 JP JP2008514960A patent/JP5241490B2/ja active Active
- 2006-06-05 KR KR1020087000146A patent/KR20080034877A/ko not_active Application Discontinuation
- 2006-06-05 ES ES06772163.9T patent/ES2676996T3/es active Active
- 2006-06-05 MX MX2007015225A patent/MX2007015225A/es active IP Right Grant
- 2006-06-05 CA CA2610860A patent/CA2610860C/en not_active Expired - Fee Related
- 2006-06-05 AU AU2006255131A patent/AU2006255131B2/en not_active Ceased
- 2006-06-05 CA CA2930810A patent/CA2930810C/en not_active Expired - Fee Related
- 2006-06-05 ES ES15153180T patent/ES2710675T3/es active Active
- 2006-06-05 WO PCT/US2006/021752 patent/WO2006133098A2/en active Application Filing
- 2006-06-05 EP EP15153180.3A patent/EP2933265B1/de not_active Not-in-force
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2007
- 2007-12-02 IL IL187806A patent/IL187806A/en active IP Right Grant
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2009
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2012
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2015
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- 2015-11-12 IL IL242570A patent/IL242570A/en active IP Right Grant
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2016
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WO2013102047A1 (en) * | 2011-12-29 | 2013-07-04 | Rhythm Pharmaceuticals, Inc. | Method of treating melanocortin-4 receptor-associated disorders in heterozygous carriers |
US9845339B2 (en) | 2011-12-29 | 2017-12-19 | Rhythm Pharmaceuticals, Inc. | Method of treating melanocortin-4 receptor-associated disorders in heterozygous carriers |
US10167312B2 (en) | 2011-12-29 | 2019-01-01 | Rhythm Pharmaceuticals, Inc. | Method of treating melanocortin-4 receptor-associated disorders in heterozygous carriers |
US10954268B2 (en) | 2011-12-29 | 2021-03-23 | Rhythm Pharmaceuticals, Inc. | Method of treating melanocortin-4 receptor-associated disorders in heterozygous carriers |
US11702448B2 (en) | 2011-12-29 | 2023-07-18 | Rhythm Pharmaceuticals, Inc. | Method of treating melanocortin-4 receptor-associated disorders in heterozygous carriers |
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Also Published As
Publication number | Publication date |
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WO2006133098A3 (en) | 2009-05-07 |
US9381194B2 (en) | 2016-07-05 |
EP1885366A4 (de) | 2010-07-14 |
IL187806A (en) | 2017-07-31 |
JP2016040259A (ja) | 2016-03-24 |
AU2006255131B2 (en) | 2012-12-13 |
JP2013067626A (ja) | 2013-04-18 |
KR20080034877A (ko) | 2008-04-22 |
WO2006133098A2 (en) | 2006-12-14 |
US20090312345A1 (en) | 2009-12-17 |
JP5241490B2 (ja) | 2013-07-17 |
JP2009509912A (ja) | 2009-03-12 |
EP1885366B1 (de) | 2018-05-30 |
AU2006255131A1 (en) | 2006-12-14 |
CA2930810C (en) | 2018-03-06 |
EP2933265A2 (de) | 2015-10-21 |
US9937165B2 (en) | 2018-04-10 |
EP2933265A3 (de) | 2015-12-30 |
EP1885366A2 (de) | 2008-02-13 |
US20160287581A1 (en) | 2016-10-06 |
CA2610860C (en) | 2016-07-26 |
CA2610860A1 (en) | 2006-12-14 |
IL242570A (en) | 2017-06-29 |
JP6119960B2 (ja) | 2017-04-26 |
HK1216256A1 (zh) | 2016-10-28 |
MX2007015225A (es) | 2008-02-22 |
IL187806A0 (en) | 2008-11-03 |
CA2930810A1 (en) | 2006-12-14 |
EP2933265B1 (de) | 2018-11-14 |
ES2710675T3 (es) | 2019-04-26 |
ES2676996T3 (es) | 2018-07-27 |
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