Patent Application
20060110448
The invention relates to pharmaceutical compositions, for use in particular in the treatment of skin diseases. It concerns a pharmaceutical composition comprising a macrolide T-cell immunomodulator or immunosuppressant and a local anaesthetic.
It has now been found that, surprisingly, macrolide T-cell immunomodulators and immunosuppressants, when used in combination with local anaesthetics, act synergistically, resulting in a potentiation of pharmacological activity, such that effective beneficial, especially anti-dermatitis activity and pain relief is seen upon co-administration at dosages which would be well below the effective dosages administered individually.
The invention thus concerns novel pharmaceutical compositions comprising a macrolide T-cell immunomodulator or immunosuppressant in association or combination with a local anaesthetic, hereinafter briefly named “the compositions of the invention”.
A macrolide T-cell immunomodulator or immunosuppressant is to be understood herein as being a T-cell immunomodulator or T-cell immunosuppressant which has a macrocyclic compound structure including a lactone or lactam moiety. While it preferably has at least some T-cell immunomodulating or immunosuppressant activity, it may also exhibit concomitantly or predominantly further pharmaceutical properties, such as anti-inflammatory activity.
A local anaesthetic is to be understood herein as being a compound other than benzyl alcohol which induces a locally limited, reversible condition of peripheral, pain-transmitting nerves or nerve endings which is associated with partial or complete lack of excitability or conducibility.
The compositions of the invention may be adapted for systemic use as regards the immunomodulator or immunosuppressant component, e.g. oral or intravenous, or for topical use for both components; however, they are preferably both adapted for topical use. They are useful for the known indications of the particular active agents incorporated therein. They are particularly indicated for use in dermatological diseases, e.g. dermatological diseases which have an inflammatory component or involve inflammatory complications, such as atopic, contact or seborrhoeic dermatitis, psoriasis, acne, rosacea, post-peel, pruritus, skin burning, or itching, and associated pain.
A suitable macrolide T-cell immunomodulator or immunosuppressant is for example an FKBP12-binding calcineurin inhibitor or mitogen-activated kinase modulator or inhibitor, in particular an asco- or rapamycin. It preferably is an ascomycin. While the macrolide preferably has at least some calcineurin- or mitogen-activated kinase modulating or inhibiting activity, it may also exhibit concomitantly or predominantly further pharmaceutical properties, such as antiinflammatory activity. It preferably is a compound, e.g. an ascomycin, having rather long-acting activity relatively to other members of the same structural class, e.g. it is metabolically degraded slowly to inactive products.
An asco- or rapamycin is to be understood as asco- or rapamycin as such, or a derivative thereof. An asco- or rapamycin derivative is to be understood as being an antagonist, agonist or analogue of the parent compound which retains the basic structure and modulates at least one of the biological, for example immunological properties of the parent compound.
An “anti-inflammatory ascomycin derivative” is defined herein as an ascomycin derivative that exhibits pronounced anti-inflammatory activity in e.g. animal models of allergic contact dermatitis but has only low potency in suppressing systemic immune response, namely, which has a minimum effective dose (MED) of up to a concentration of about 0.04% w/v in the murine model of allergic contact dermatitis upon topical administration, while its potency is at least 10 times lower than for tacrolimus (MED 14 mg/kg) in the rat model of allogeneic kidney transplantation upon oral administration (Meingassner, J. G. et al., Br. J. Dermatol. 137 [1997] 568-579; Stuetz, A Seminars in Cutaneous Medicine and Surgery 20 [2001] 233-241). Such compounds are preferably lipophilic.
Suitable ascomycins are e.g. as described in EP 184162, EP 315978, EP 323042, EP 423714, EP 427680, EP 465426, EP 474126, WO 91/13889, WO 91/19495, EP 484936, EP 523088, EP 532089, EP 569337, EP 626385, WO 93/5059 and WO 97/8182; in particular:
Suitable anti-inflammatory ascomycin derivatives are e.g.: (32-desoxy-32-epi-N1-tetrazolyl)ascomycin (ABT-281); 5,6-dehydroascomycin; ASD 732; and pimecrolimus.
Suitable rapamycins are e.g. as described in U.S. Pat. No. 3,929,992, WO 94/9010 and U.S. Pat. No. 5,258,389, preferably sirolimus (rapamycin; Rapamune®) and everolimus (RAD001; Certican®).
A suitable local anaesthetic is for example an aminoester or aminoamide; it is e.g.:
Subgroups of compositions of the invention comprise a macrolide T-cell immunomodulator or immunosuppressant, preferably an anti-inflammatory ascomycin derivative as defined above, especially pimecrolimus, in combination or association with a local anaesthetic other than prilocaine and/or lidocaine.
In a further subgroup of compositions of the invention the macrolide T-cell immunomodulator or immunosuppressant is other than tacrolimus. In a further subgroup it is other than tacrolimus and sirolimus. In a further subgroup it is other than tacrolimus, sirolimus and ascomycin.
A particularly preferred composition of the invention is pimecrolimus in association or combination with lidocaine.
The local anaesthetic may be e.g. an injectable or, preferably, a compound indicated for topical use.
Preferred for use in the treatment of conditions where inflammation is involved are compositions of the invention wherein one or both components possess some degree of inherent anti-inflammatory activity. Particularly preferred are compositions comprising an ascomycin in combination with a local anaesthetic, especially 33-epichloro-33-desoxy-ascomycin in combination with polidocanol, lidocaine or prilocaine. The inflammatory condition is e.g. atopic, contact or seborrhoeic dermatitis, psoriasis, acne, rosacea, post-peel pruritus, skin burning, or itching; and associated pain.
“Treatment” as used herein includes prevention, namely prophylactic as well as curative treatment.
The local anaesthetic component is administered normally topically, the macrolide T-cell immunomodulator or immunosuppressant may be administered together with the local anaesthetic, normally topically, or separately, either topically or systemically. Preferred is topical administration of both components.
Synergy is e.g. calculated as in Berenbaum, Clin. Exp. Immunol. 28 (1977) 1, using an interaction term to correct for differences in mechanism between the two drugs, as described in Chou et al., Transpl. Proc. 26 (1994) 3043. The index of synergy is calculated as:
in which the doses of the compounds A and B represent those used in a particular combination, and AE and BE are the individual doses of A and B respectively giving the same effect. If the result is less than 1, there is synergy, if the result is 1, the effect is additive; if the result is greater than 1, A and B are antagonistic. By plotting an isobologram of dose of A/AE vs. dose of B/BE the combination of maximum synergy can be determined. The synergistic ratio expressed in terms of the ratio by weight of the two compositions at synergistic amounts along the isobologram, especially at or near the point of maximum synergy, can then be used to determine formulations containing an optimally synergistic ratio of the two compounds.
Activity may e.g. be determined in known assay models for testing the pharmacological activity of the individual components of the compositions.
The invention also provides products and methods for co-administration of a macrolide T-cell immunomodulator or immunosuppressant, e.g. 33-epichloro-33-desoxy-ascomycin or 5,6-dehydroascomycin, and a local anaesthetic, e.g. polidocanol, lidocaine or prilocaine, at synergistically effective dosages, e.g.:
By “synergistically effective amounts” is meant an amount of macrolide T-cell immunomodulator or immunosuppressant and an amount of local anaesthetic which are individually below their respective effective dosages for a relevant indication, but which are pharmaceutically active on co-administration, e.g. in a synergistic ratio, for example as calculated above. Furthermore, “synergistically effective amounts” may mean an amount of macrolide T-cell immunomodulator or immunosuppressant and an amount of local anaesthetic which are individually equal to their respective effective dosages for a relevant indication, and which result in a more than additive effect.
The molar amount of macrolide T-cell immunomodulator or immunosuppressant present is from roughly similar to, to significantly less than the amount of local anaesthetic, preferably half as much or less. Synergistic ratios of macrolide T-cell immunomodulator or immunosuppressant to local anaesthetic by weight are thus suitably from about 10:1 to about 1:50, preferably from about 5:1 to about 1:20, most preferably from about 1:1 to about 1:15, e.g. about 1:12.
The compositions of the invention can be administered as a free combination, e.g. for separate systemic and topical administration of the two components, or can be formulated into a fixed combination, preferably for topical administration of both components, which greatly enhances the convenience for the patient.
Absolute dosages of the compounds will vary depending on a number of factors, e.g. the individual, the route of administration, the desired duration, the rate of release of the active agent and the nature and severity of the condition to be treated. For example, the amount of active agents required and the release rate thereof may be determined on the basis of known in vitro and in vivo techniques, determining how long a particular active agent concentration in the blood plasma remains at an acceptable level for a therapeutic effect.
For example, in prevention and treatment of a dermatological disease such as atopic or contact dermatitis, itching, or pruritus, an initial dosage of about 2-3 times the maintenance dosage is suitably administered, followed by a daily dosage of about 2-3 times the maintenance dosage for a period of from one to two weeks, and subsequently the dose is gradually tapered down at a rate of about 5% per week to reach the maintenance dosage. In general, synergistically effective amounts of 33-epichloro-33-desoxyascomycin on oral administration for use in prevention and treatment of atopic, contact or seborrhoeic dermatitis, psoriasis, acne, rosacea, post-peel, pruritus, skin burning, or itching, and associated pain, in larger animals, e.g. man, are amounts of 33-epichloro-33-desoxyascomycin of up to about 2 mg/kg/day, e.g. from about 0.01 mg/kg/day to about 2 mg/kg/day, preferably about 0.5 mg/kg/day, in combination or co-administration with topically effective amounts of polidocanol, lidocaine or prilocaine, in a synergistic ratio as described.
By “co-administration” is meant administration of the components of the compositions of the invention together or at substantially the same time, e.g. within fifteen minutes or less, either in the same vehicle or in separate vehicles.
The compositions of the invention include compositions suitable for administration by any conventional route, in particular compositions suitable for administration either enterally, for example, orally, e.g. in the form of solutions for drinking, tablets or capsules, or parenterally, e.g. in the form of injectable solutions or suspensions; or topically, e.g. for the treatment of inflammatory conditions of the skin or mucosae, e.g. in the form of a dermal cream, ointment, ear drops, mousse, shampoo, solution, lotion, gel, emulgel or like preparation, e.g. in a concentration of from about 0.1% to about 5% by weight of each component, especially in combination or association with penetration enhancing agents, as well as for application to the eye, e.g. in the form of an ocular cream, gel or eye-drop preparation, for treatment of inflammatory conditions of the lungs and airways, e.g. in the form of inhalable compositions, and for mucosal application, e.g. in the form of vaginal tablets.
The compositions of the invention are suitably emulsions, microemulsions, emulsion preconcentrates or microemulsion preconcentrates, or solid dispersions, especially water-in-oil microemulsion preconcentrates or oil-in-water microemulsions, comprising the macrolide T-cell immunomodulator or immunosuppressant and the local anaesthetic in a synergistic ratio.
The compositions of the invention can be prepared in conventional manner, e.g. by mixing a macrolide T-cell immunomodulator or immunosuppressant and a local anaesthetic, in combination or association with at least one pharmaceutically acceptable diluent or carrier.
The active agent components may be in free form or pharmaceutically acceptable salt form as appropriate.
While the present invention primarily contemplates combination or association of just two pharmaceutically active components, it does not exclude the presence of further active agents, e.g. one further active agent, as far as they do not contradict the purpose of the invention.
The following Examples illustrate the invention. The compounds are in free, i.e. neutral or base form unless specified otherwise.
* amount required to adjust pH to 5.5
**p-hydroxybenzoic acid methylester
***p-hydroxybenzoic acid propylester
The preparation follows the conventional manufacturing procedures for an emulsion. 33-Epichloro-33-desoxyascomycin is added to the heated homogeneous oily phase which contains triglycerides medium chain, oleyl alcohol, sodium cetylstearyl sulfate, cetyl alcohol, stearyl alcohol and glyceryl monostearate. In parallel, the water phase containing lidocaine hydrochloride, the Parabens, propylene glycol, citric acid and sodium hydroxide is heated at the same temperature as the oily phase. The oily phase is added to the water phase and homogeneisation is performed. The resultant cream is cooled to room temperature.
The composition and its preparation are as for Example 1, except that benzyl alcohol 1.00 g is used in place of the Parabens.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0307869.8 | Apr 2003 | GB | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP04/03515 | 2/4/2004 | WO | 11/3/2005 |
