US20110150890A1 - Use of cgrp antagonist compounds for treatment of psoriasis - Google Patents

Use of cgrp antagonist compounds for treatment of psoriasis Download PDF

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US20110150890A1
US20110150890A1 US13/039,075 US201113039075A US2011150890A1 US 20110150890 A1 US20110150890 A1 US 20110150890A1 US 201113039075 A US201113039075 A US 201113039075A US 2011150890 A1 US2011150890 A1 US 2011150890A1
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cgrp
psoriasis
cgrp antagonist
piperidinyl
compounds
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Birkir SVEINSSON
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Priority to US15/355,723 priority patent/US10668132B2/en
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Definitions

  • Psoriasis is a chronic skin disorder that afflicts about 2 percent of the population.
  • the disease is associated with the rapid turnover of skin cells (hyperproliferation) accompanied by a loss of differentiation so that silvery white scales form on the surface of the skin. Additionally, the capillaries become tortuous and dilated and an inflammatory reaction occurs, so that the skin reddens.
  • the elevated silvery white scales on a contrasting red background produce the unsightly lesions characteristic of psoriasis.
  • Psoriasis most commonly appears on the scalp, knees, elbows, hands and feet, but can affect any part of the skin.
  • the cause of the disease is unknown, though it is believed to have a genetic component, and it has been suggested to be a T-cell mediated autoimmune skin disorder.
  • T-cell mediated autoimmune skin disorder There have been many attempts to treat the disease, and several topical and systemic treatments for psoriasis which inhibit cell division have been tried, with limited success in clearing the skin for short periods of time. Yet, the reason why these treatments work is not yet clearly understood.
  • Treatments which have been suggested in the art appear to be symptomatic and palliative. Lesions may disappear-spontaneously, or as a result of the therapy, but recurrences are likely.
  • the present invention is directed to methods of treatment of psoriasis based on observations and, new findings that strongly indicate that psoriasis is a disease of the nervous system, and that the neuropeptide calcitonin gene-related peptide (CGRP) is a major mediator of the disease.
  • CGRP neuropeptide calcitonin gene-related peptide
  • CGRP is a 37 amino acid polypeptide that is stored and released from nerve terminals in both the central nervous system and the peripheral nervous system. CGRP has been detected in nerves innervating the heart, peripheral and cerebral blood vessels, and kidneys by immunohisto-chemical (such as ELISA) and radioimmunoassay methods. CGRP has been shown to mediate its biological response by binding to specific cell surface receptors that have been identified in a variety of tissues.
  • CGRP also is a very important neuropeptide (NP) in wound healing and is the first NP that is released during that process.
  • NP neuropeptide
  • CGRP is a very strong vasodilator and is a strong inhibitor of delayed type hypersensitivity (DTH).
  • DTH delayed type hypersensitivity
  • Tryptase is a protease enzyme that cleaves CGRP and reduces its activity.
  • CGRP 8-37 is an endogen peptide that is made from CGRP by specific cleavage by tryptase.
  • CGRP 8-37 is a high affinity antagonist for the CGRP receptor. It is thought that this antagonist is an endogen compound used by the body for the down-regulating neural signals (negative feedback control).
  • capillary loops are seen in papillary dermis in psoriasis than healthy skin. These vessels in the horizontal plexus are an integral component of the lesions in psoriasis vulgaris and pustular psoriasis of von Zumbusch.
  • the capillary loops in the papillary dermis of psoriatic lesions become dilated and tortuous before epidermal hyperplasia has been detected morphologically.
  • the capillary network around the hair follicles has a venous ultrastructure: bridge fenestration and a laminated basal membrane.
  • the vascular network is greatly reduced in size, partly through loss and partly through collapse.
  • the growth cycle of hair is a well-known phenomenon (see e.g. Hair Structure and LifeCycle, http://follicle.com). Hairfollicles grow in repeated cycles. One cycle can be broken down into three phases: anagen (growth phase), catagen (transitional phase), and telogen (resting phase). In any one time, about 85% of hairs of all hairs are in anagen phase. At the end of anagen phase the hairs enter into catagen phase, which lasts about one or two weeks. The telogen phase follows the catagen phase and normally lasts about 5-6 weeks. Approximately 10-15% of all hairs are in this phase at any one time.
  • CGRP provides this role. It is here postulated that CGRP turns hair follicles to proliferative phase to bring stem cell keratinocytes to the surface to participate in keratinocyte proliferation of the epidermis when the skin is healing.
  • the keratinocytes come from the outer root sheath or the papilla dermis of the hair follicle. This is further supported by the fact that neuropeptides are thought to play a major role in regulating hair growth (see, e.g., J. Invest. Dermatol. Symp. Proc. 1997; 2(1), 61-68).
  • psoriasis lesions can be explained based on neural origin of psoriasis. Striking symmetry of the lesions is common and lesions are located in areas that are known or likely nerve overlap areas, as e.g. the navel, lower back, temporal scalp region, elbows and knees. On the scalp and on the sacral area are very likely embryonic parts of the neural crest that are the last to close in the fetal development of the skin. This is further supported by the fact that aplasia cutis absence of skin most often is located on the scalp in the right tempoeral area, and spina bifida is located in the lumbosacral area.
  • Psoriasis lesions often appear at the same spots on the skin repeatedly, i.e. with a memory effect. This is the same as often seen in herpes simplex infections (viral nerve infection in peripheral skin). I have seen clinical case of a psoriasis patient that had psoriasis lesions distributed along a dermatome (nerve innervation area). The same pattern is seen in Herpes Zoster infection (viral nerve infection).
  • SP and CGRP are both active in wound healing, CGRP in the early phase and SP later. Reports show high density of SP and CGRP in psoriasis skin, see e.g. Jiang et al. Int. J. Dermatol. 1998, 37, 572-574.
  • the substance P antagonist Spantide inhibits immediate and delayed type cutaneous hypersensitivity (DTH) reaction. This could be mediated through CGRP as it is known that CGRP suppresses DTH, thus SP might act as a regulator for CGRP: (Wallengren J. Br. J. Dermatol., 1991, 124(4): 324-8)
  • Experiments in animals revealed that this phenomenon is dependent on proteases from mast cells. (Brain S. D.; Williams, T. J. “Substance P regulates the vasodilator activity of CGRP” Nature 1988 335(6185), 73-5).
  • SP converts the long lasting vasodilatation induced by CGRP into a transient response when these neuropeptides were injected into human skin.
  • a subsequent study J. Geronal.: Biol. Sciences 1996; Vol. 51A, no, B354-B361) used a “blister model in the rat hind footpad” to demonstrate the ability of SP to terminate an existing vasodilator response to CGRP.
  • Haukkarinen et al. reports by Haukkarinen et al. (Haukkarinen et al. Journal of Pathology , (1996) 180, 200205) describe studies of contact values between sensory nerves containing SP, CGRP, and VIP, and mast cells containing active tryptase and inactive chymase.
  • the contact values of SP and CGRP with mast cells are increased in psoriatic lesions, whereas contact values for VIP are decreased.
  • Tryptase effectively cleaves CGRP as well as VIP but not SP, whereas chymase cleaves SP. This points to a controlling mechanism in psoriasis acting to increasing cleavage of CGRP but not SP, i.e. active tryptase is increased in order to try to down-regulate CGRP, but active chymase is not increased.
  • psoriasis can be explained by an alteration in one enzyme system, and possibly just by alteration in a single amino acid for any given subtype of psoriasis, in the enzyme tryptase.
  • Certain observations support this notion for example, smoking is known to increase likelihood of psoriasis, and smoking is also known to cause defects in tryptase in lungs. This would, however, not change the effect of the present invention, that by blocking CGRP, psoriasis may be treated or prevented.
  • This hypothesis could be readily verified by screening tryptase (or the gene ceding for tryptase) from psoriasis patients and control groups to identify possible gene defects.
  • CGRP CGRP does not induce itch but SP does, and itch is most often not a symptom associated with psoriasis; CGRP does not produce weal and flare as much as SP, and SP is very active in conducting pain and burning sensation, neither of which are normally symptoms of psoriasis. CGRP however produces prolonged erythema, which is associated with psoriasis, but SP does not.
  • Guttae psoriasis is often seen following streptococcal infection. Several groups of streptococci can induce this. These bacteria have in common that they all produce exotoxin C, a pyrotoxin that induces vasodilatation when injected into the skin. This was used in the past as a diagnostic test of streptococcal infection known as the Dicks test. Experimental work from Beijing Medical University has shown that rats that are given endotoxin have increased level-of-CGRP in plasma (Tang et al. Sheng Li Xue Bap 1997 April; 49(2):160-6 (Medline abstract PMID: 9812851)).
  • CGRP is released from sensory neurones and also is the transcription of CGRP mRNA and synthesis of CGRP in sensory neurones increased during the development of endotoxicosis in the rat.
  • CGRP is a key mediator in psoriasis, which has subsequently inspired the current invention that relates to methods of treatment for psoriasis based on the use of specific CGRP antagonists.
  • CGRP antagonists are expected to be useful in the treatment of a variety of disease states that are mediated by CGRP.
  • Diseases that such treatment has been suggested for include headaches, esp. migraines; NIDDM; neurogenic inflammation; cardiovascular disorders; chronic inflammation; pain; endotoxic shock; arthritis; allergic rhinitis; allergic contact dermatitis; inflammatory skin conditions; and asthma.
  • Such compounds however, have not to my knowledge been suggested for treatment of psoriasis.
  • Compounds disclosed in the prior art found to be useful as antagonists of CGRP include 4-sulfinyl benzamide compounds (WO 98/56779), 3,4-dinitrobenzamide compounds (WO 98/09630), a group of modified amino acids (WO 00/55154), and benzamidazolinyl piperadine compounds (WO 00/18764).
  • Antibodies against CGRP have also been described, and inactive derivatives of CGRP, e.g. CGRP 8-37 which differs from normal CGRP in that it lacks 8 N-terminal amino acids.
  • U.S. Pat. No. 5,935,586 describes the use of CGRP antagonists in therapeutic/cosmetic compositions for treating diseases of the skin, in particular, lichens, prurigos, pruriginous toxidermas and severe pruritus.
  • U.S. Pat. No. 5,932,215 describes similar use for treating skin redness, rosacea and discrete erythema.
  • CGRP calcitonin gene related peptide
  • CGRP can be a common factor in both diseases, as it is involved in the use of papillary cells for wound healing and through that route can activate hair follicles in the wound healing process. It is known that psoriasis is a disease connected to the early wound healing process. The observations described herein showing hexagonal structure of psoriasis lesions strongly suggests that the disease involves neural units of sensory innervation. In conclusion, it is a novel hypothesis of the inventor set forth and supported herein that psoriasis is a disease of neural origin and CGRP is likely to be a key mediator of the disease. According to this hypothesis, it is the regulation of CGRP that is not functioning properly in psoriasis, and consequently, regulation of CGRP by use of a CGRP antagonistic compound is a way of controlling psoriasis.
  • the present invention describes a novel method for the treatment and prevention of psoriasis by modulating the concentration of CGRP in the body, especially in the skin, e.g., by the use of CGRP antagonists.
  • the invention is supported by the novel observations and descriptions herein that explain psoriasis as a disease of neurological origin for which CGRP s a key mediator.
  • the invention is based on the notion that by changing the level of CGRP, at least in the psoriatic-lesions, such as by blocking the activity of CGRP, the disease can be treated and/or prevented. This may effected by the administration of CGRP antagonist compounds, or by administering tryptase or other compounds affecting the level of CGRP.
  • the current invention relates to methods for treating, remedying or preventing psoriasis by the use of CGRP antagonist compounds. To date it has not been envisaged to treat psoriasis with CGRP antagonists. Accordingly, the present invention features the use of at least one CGRP antagonist compound for the treatment of psoriasis.
  • CGRP antagonist in this context represents any molecule, whether organic or inorganic, which is capable of reducing the level of active CGRP, e.g., by effecting inhibition of the receptor binding of CGRP or of effecting inhibition of the synthesis and/or release of CGRP by nerve fibers, or enhancing the breakdown of active CGRP.
  • tryptase active polypeptides falls within this category as defined herein as they can affect the level of CGRP by cleavage of the peptide, as well as compounds stabilizing tryptase, such as heparin.
  • tryptase active polypeptides falls within this category as defined herein as they can affect the level of CGRP by cleavage of the peptide, as well as compounds stabilizing tryptase, such as heparin.
  • many compounds have been recently developed that fulfill these criteria and thus are useful in the current invention.
  • Treatment in this context indicates any form of therapy that mires or relieves at least partially the symptoms of the disease, for at least a period of time, remedying the disease indicates herein full or partial relief of psoriasis symptoms.
  • Microdialysis is a method for tissue fluid sampling. It has been used both in the skin and other tissues.
  • Laser-Doppler flow measurement is a technique for measuring localized superficial blood flow in the skin.
  • the invention provides a method of treating psoriasis in a subject comprising administering to the subject a therapeutically effective dose of at least one CGRP antagonist compound in a pharmaceutically acceptable formulation.
  • a therapeutically effective dose will depend on the particular compound selected but is typically in the range of about 0.00001% to 5% of the total weight of a pharmaceutical composition being used for said treatment, preferably in the range of about 0.0001% to 2.5% of weight, such as in the range of 0.001 to 1% of weight, or in the range of 0.001 to 0.1% of weight.
  • a suitable pharmaceutically acceptable formulation may be formulated according to conventional pharmaceutical methods, depending on the compound being selected and the intended route of administration, as discussed further below.
  • the method according to the invention includes both systemic and/or local treatment.
  • compositions for use according to the invention may be administered orally, nasally, rectally, pulmonary, buccally or via subcutaneous; intravenous or intramuscular injection in order to reach the lesions from a distal-administration, or by administering the composition locally, such as topically, dermally, intradermal or subcutaneously, or via dermal or subcutaneous infusion such as through microdialysis.
  • presently preferred embodiments comprise topical administration.
  • the invention provides in a related aspect, the use of a CGRP antagonist compound for the manufacture of a medicament for treating, remedying or preventing psoriasis in a subject in need thereof.
  • a CGRP antagonist compound for the manufacture of a medicament for treating, remedying or preventing psoriasis in a subject in need thereof.
  • Such medicaments are preferably such compositions as are disclosed herein.
  • the invention provides a method to reduce hair growth by the application of a CGRP antagonist compound such as defined above.
  • a CGRP antagonist compound such as defined above.
  • these methods comprise the topical or dermal application of medicaments such as a cream, ointment, gel, paste, iontopophoresis system, liquid or lotion, to the area where hair growth reducing effect is wanted.
  • topical formulations according to the invention comprise an active ingredient together with one or more pharmaceutically acceptable carrier and/or excipient compounds and optionally one or more therapeutically active ingredient.
  • Formulations suitable for topical administration may be formulated into any pharmaceutical form normally employed for such an application, these include liquid or semi-liquid preparations including lotions, creams, pastes, ointments, liposomes, gels, such as for iontopophoresis, suspensions and emulsions, including oil/water (w/o), w/o, o/w/o, w/o/w emulsions or microemulsions. They may suitably be obtained by mixing the active ingredient in finely-divided or powdered form, alone or in solution or suspension in an aqueous or non-aqueous fluid, with the aid of suitable machinery, with a hydrophobic or hydrophilic basis.
  • the basis may comprise hydrocarbons such as hard, soft or liquid paraffin, glycerol, waxes (e.g., beeswax, carnauba wax), metallic soap, a mucilage, an oil of natural origin such as corn, almond, castor, or olive oil, mineral oils, animal ols (perhydroxysqualene); or a fatty acid such as stearic or oleic together with an alcohol such as ethanol, isopropanol, and propylene glycol.
  • the formulation may include any suitable surface active agent such as an anionic, cationic, or non-ionic surfactant such as sorbitan esters or polyoxyethylene derivatives thereof.
  • Suspending agents such as natural gums; cellulose derivatives or inorganic materials such as silicaceous silicas may also be included.
  • the formulations may additionally comprise absorbtion promoters, stabilizers, e.g. protein stabilizing agents, known in the art.
  • An interesting compound described in the art a non-peptide molecule produced by Boehringer Ingelheim, termed BIBN4096BS (see, Wu et al., Biochem. Sac. Trans. 2002, Aug. 30(4): 468-473).
  • Compounds that are believed to have a CGRP antagonist activity and thus being candidate compounds for use according to the present invention include:
  • indirect inhibitors of CGRP activity may be useful according to the invention. These include the capsaicin blocker capzaezine, as CGRP is postulated to be under the influence of capsaicin through the vanillin receptor. Other such indirect inhibitors include Histamine H3-receptor agonists such as imetit which can downregulate CGRP.
  • the pharmaceutical composition comprising a CGRP antagonist compound is administered for treatment of psoriasis in combination. with another treatment form, such as UVB treatment which is performed with standard methods in the art.
  • a method for identifying a candidate compound for use in a medicament for treating psoriasis.
  • the method comprises the steps of obtaining a compound suspected of binding to a CGRP receptor; adding the compound at varying concentrations such as in the range of about 0.1 ⁇ M to 1 mM to samples comprising CGRP receptors and incubating for a suitable time; adding labeled CGRP peptide to the incubated samples (e.g., radiolabeled, such as by iodine 125 , though other labeling methods well known in the art are applicable as well); determining the binding of the labeled CGRP peptide to the CGRP receptor in said samples with varying concentration of the candidate compound; and determining the binding affinity of the compound to the CGRP receptor;
  • said samples comprise live cells having surface bound CGRP receptors. In certain embodiments said samples comprise cell membrane preparations.
  • FIGS. 1 a & b Images depicting the scalp of a patient with Alopecia aerate and psoriasis.
  • FIG. 2 a & b Psoriasis pattern on legs of patients.
  • FIG. 3 Psoriasis lesions on a finger.
  • FIG. 4 Image showing Herpes zoster lesions.
  • FIG. 5 Psoriasis lesions formed after skin injury.
  • FIG. 6 Image showing pattern of Alopecia aerate on the scalp of a patient.
  • UVB treatment Patients receiving UVB treatment according to standard clinical practice were observed and interviewed. It was noticed that several patients experienced transient worsening of psoriasis after their first treatment sessions, in the very first days after initiating treatment, before they begin to get better. Worsening was defined as flare-up or increased size of existing lesions or appearance of new ones.
  • Psoriasis lesions on a number of patients have been carefully studied to analyze patterns of the lesions.
  • a hexagonal pattern can be observed on many patients, see FIGS. 2-3 .
  • Such pattern has not been described before. It is postulated that the pattern is a representation of neurological units. The exact structure of the nerve innervations in the skin has never been described in detail.
  • Herpes Zoster lesions have been studied. It is noted that such patterns also show hexagonal pattern ( FIG. 4 ).
  • Herpes Zoster a viral nerve infection, has a known neurological connection, and therefore the fact that hexagonal patterns are observed in both Herpes Zoster and psoriasis supports that such'patterns are representations of neurological units.
  • FIGS. 6 a and b of the scalp of a patient with Alopecia areata reveals that Alopecia spots display non-circular forms resembling hexagonal shape.
  • the indication that AA also shows patterns indicative of neural factors further support the notion of psoriasis being a neurological disorder.
  • Orecchia et al. (Orecchia, G. et al. Dermatologica 1990, 180, 57-59) describe treatment of AA with SABDE (squaric acid dibutylester), a topical sensitizer.
  • SABDE squaric acid dibutylester
  • a patient who received the treatment developed psoriasis at the same spot where he got hair regrowth. Hairs on the psoriatic plaques were the last to fall off when the disease progressively worsened after treatment, to Alopecia Universalis.
  • CGRP can turn the hair in resting phase (telogen phase) into active phase (anagen phase).
  • telogen phase resting phase
  • anagen phase active phase
  • DTH delayed type hypersensitivity
  • a lotion for treatment and/or prevention of psoriasis by topical administration may be prepared as follows:
  • a suitable compound is selected, from those disclosed in the description or a compound identified with the method of Example 10 percent lotion is prepared as follows: about 0.1 to 0.5 g of the compound is dissolved in ethanol (6 ml), and the solution is admixed with a water-in-oil lotion (95 g) prepared from mineral oil, cottonseed oil, isopropyl palmitate and water with a surfactant such as sorbitan sesquioleate.
  • the ingredients in the water-in-oil lotion are present for example in 10:10:5:70:5 parts by weight respectively.
  • test compounds are assayed for the inhibition of [ 125 I] CGRP (from Amersham, Chicago, Ill.).
  • SK-N-MC cells (American Type Culture Collection, Rockville, Md.) are grown in Minimum Essential Medium (“MEM”) containing fetal calf serum (10%).
  • MEM Minimum Essential Medium
  • Cells are grown in T-150 flasks or Costar multiwel plates and maintained at 37° C. in a 90% humidified incubator with an atmosphere of 5% CO 2 and 95% air.
  • the cells are homogenized in 5 mM Tris-HCl pH 7:4, 10 mM Na-EDTA and the homogenate centrifuged at 48,000 g for 20 min at 4° C.
  • the pellet is re-suspended in 20 mL Na-HEPES pH 7.4, 10 mM MgCl 2 and recentrifuged.
  • the membrane pellets are re-suspended in the same buffer and stored frozen at ⁇ 70° C.
  • the protein concentration is measured by the Pierce BCA method using BSA (Bovine serum albumin) as a standard.
  • the [ 125 ]CGRP receptor binding assay is performed using a buffer of 20 mM Na-HEPES pH 7.4, mM MgCl 2 , 0.05% BSA and 0.1 mg/mL bacitracin.
  • the membranes 50 ⁇ g/mL are incubated with various concentrations (such as in the range of about 1 ⁇ M and 1 mM) of the test compounds and 40 pM [ 125 ]CGRP in a total volume of 500 ⁇ L for 60 min at 25° C.
  • the reaction is terminated by addition of 2 mL ice-cold 0.9% NaCl, followed by rapid filtration through Skatron Filtermates pre-soaked in 0.5% polyethylenimine (PEI).
  • the filters are rinsed twice with 2 mL of cold 0.9% NaCl and the radioactivity counted in a gamma counter.
  • the binding data is analyzed with conventional ligand-binding calculations and programs, such as the LIGAND 2 program.
  • Laser Doppler blood flow measurement was used to measure blood flow in normal skin surrounding psoriasis lesions to determine the location of the active edge of psoriasis lesions. It is known that psoriasis lesions grow directionally, i.e., have a growing or active edge (see, Cunliff at al. J. Invest. Dermatol. 1989, 92(6):782-5). CGRP levels were measured in both the active edge and the inactive (opposite) edge in two subjects having psoriasis lesions. Initial results indicate that CGRP levels are increased in the active edge as compared to the inactive edge.
  • the experiment was conducted by the use of microdialysis equipment for tissue fluid sampling with a 15 kDa cutoff probe; both the active and inactive edge were sampled for a total of 165 min. each sample to obtain a volume of 165 ⁇ L in each sample.
  • Neuropeptide CGRP concentration was measured with ELISA.
  • Tissue biopsies from the sampled skin locations were taken after the tissue fluid sampling. At the active edge increased blood flow was observed indicated by increased capillary blood vessels indicated by increased number of capillary loops in the papillary dermis, which also were dilated. No epidermal hyperplasia or T-cell activation were found.

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