Patent Application
20100298249
The present invention relates to compositions for topical and/or parenteral application comprising, in a physiologically acceptable medium, a retinoid and/or salts thereof and/or derivatives thereof, and an inhibitor of hyaluronic acid, to processes for the production of such compositions, and to uses thereof as pharmaceutical compositions, especially as a medicament, or as cosmetic compositions. Said compositions are for use in the treatment of dermatological conditions, in particular in the treatment by filling of wrinkles, fine lines, fibroblast depletions and any scars.
Skin aging is one of the most visible modifications of the process of senescence. In addition, the skin is exposed to many factors that accelerate this physiological process. A distinction can be made between two different types of skin aging. Firstly, intrinsic aging, that it is easier to evaluate on areas which are not normally exposed to the sun and, secondly, extrinsic aging, brought about by the interaction of environmental factors, in particular UV rays. These environmental factors have a much more marked effect on the parts of the body exposed to the sun, especially in individuals of light phototype. This is then also referred to as actinic aging. Other factors, such as dietary habits, smoking, excessive alcohol consumption, chronic diseases and endocrine gland dysfunctions, also contribute to this aging.
During intrinsic skin aging, the horny layer is relatively unmodified. The epidermis is atrophic and the dermal-epidermal junction is flattened, such that the adhesion to the dermis is weaker, facilitating the formation of bubbles. The thickness of the dermis is clearly reduced; there are fewer blood vessels. Fewer fibroblasts are also observed and their biosynthetic and proliferative capacities are reduced. The elastic fibres first undergo modifications, and subsequently disappear.
As regards extrinsic aging, an irregular, sometimes atrophic, sometimes hyperplasic, epidermis is observed, with signs of disorganization and of dysplasia. There are more melanocytes in certain areas, and fewer in others. The distribution of melanin in the epidermis is also irregular, subsequent to melanosome transfer problems. The number of Langerhans cells decreases. The small blood vessels are first dilated, and then become thinner and atrophy.
Wrinkles are the most visible signs of aging. A distinction can be made between several types, in particular superficial and deep wrinkles. Deep wrinkles are thought to be due to dermo-hypodermal modifications, whereas superficial wrinkles could be explained by dermal and possibly epidermal modifications. Wrinkles are especially due to the loss of elasticity of the skin. The effect on the subepidermal elastic network gives rise to superficial laxity of the aged skin and folding of its surface. The destruction of the elastic fibres in the reticular dermis is responsible for the loss of elasticity and of the skin's ability to return to its shape after stretching. A suitable treatment will be possible according to the type, the intensity and the topography.
The treatment of unattractive skin modifications related to aging has made enormous progress over the past few years.
A relatively large number of natural or synthetic substances have already been described as dermal implants, i.e. as substances injected directly into the skin, in order to remedy skin alterations resulting from aging, traumas or diseases.
Other therapeutic alternatives for these applications are in particular the local injection of deactivated botulinum toxin (Botox®) or the use of laser techniques. These various types of treatment are not exclusive and a combination thereof has even been recommended. Among the natural substances of human origin, collagen and hyaluronic acid are those which form the basis of the majority of products available on the market.
Hyaluronic acid is a ubiquitous natural polysaccharide which exists in the same form from the simplest bacterium to humans. It is a polysaccharide composed alternately of D-glucuronic acid and N-acetylglucosamine, linked to one another by alternating beta-1,4 and beta-1,3 glycosidic linkages. According to Saari H et al. Differential effects of reactive oxygen species on native synovial fluid and purified human umbilical cord hyaluronate. Inflammation 17 (1993): 403-415, the polymers of this recurring unit may be between 102 and 104 kDa in size, in vivo, hyaluronic acid taken from the umbilical cord having a weight of 2500 kDa.
Hyaluronic acid represents in particular a natural constituent of the dermis, where it plays an important role in the hydration and elasticity of the skin. However, it decreases in amount and in quality with age, leading to drying out of the skin, which becomes wrinkled. It is highly water-soluble and forms high-viscosity solutions in water. Because of these specific properties, hyaluronic acid is among the pharmaceutical products most commonly used.
However, in humans, hyaluronic acid is very rapidly eliminated from the plasma by degradation. Its plasma half-life after intravenous injection is very short, between 2.5 and 5.5 minutes, whereas in the skin, its half-life is from 0.5 to 2 days depending on its concentration. Its excretion in the urine is low, less than 1% of total clearance. In rabbits, the rate of elimination, in the skin, has been measured (Reed R K, Laurent U B, Fraser J R, Laurent T C. Removal rate of [3H]hyaluronan injected subcutaneously in rabbits. Am J Physiol. 1990 August; 259 (2 Pt 2): H532-5). It is nonexponential with a half-life of 0.5 to 1 day when its concentration is 5 mg/ml.
The tolerance of hyaluronic acid is very good and no immunogenicity has been associated with this substance. A very low incidence of side effects is thus observed.
The use of hyaluronic acid, alone or in combination, has thus been described for several medical applications, such as, for example, the treatment of osteoarthritis and also rheumatoid arthritis. Injectable compositions such as, for example, hyaluronic acid alone, collagen alone or the combination of “hyaluronic acid and collagen” have already been used in repair surgery, in the context of the treatment by filling of wrinkles, fine lines, fibroblast depletions and any scars.
Currently, many dermal implants are used but none has yet been considered to be ideal in the context of a safe and healthy tissue augmentation (Naoum C, Dasiou-Plakida D. Dermal filler materials and botulin toxin Int J Dermatol. 2001 October; 40(10): 609-21).
However, because the bioavailability of hyaluronic acid is too low after injection and its injection frequency is too high, it cannot be used as such.
Of course, there has been an effort to develop compositions based on hyaluronic acid having a very good bioavailability and capable of more successfully withstanding the action of degradation enzymes. This makes it possible, in particular, to space out the procedures and to reduce the number thereof.
These compositions used as a dermal implant are all composed of stabilized hyaluronic acid and a large number of them comprise hyaluronic acid that has been chemically modified for this purpose. In addition, the hyaluronic acid included in these products is predominantly of nonhuman origin, for instance of avian or bacterial origin.
Numerous chemically modified hyaluronic acid derivatives in the form, in particular, of esters, amides and also derivatives having “intra- and/or interchain bridges” (crosslinked), are thus found in these compositions.
However, these modifications affect the physicochemical characteristics and the biological properties of hyaluronic acid, its potential immunogenicity and also its outcome after administration. These structural modifications of hyaluronic acid can lead to inflammatory reactions, as reported by Sopaar CNS, Patrinely JR Ophthalmic plastic and reconstructive surgery 2005 March; 21(2): 151-53.
Given the above, a problem that the invention is intended to solve is to produce compositions making it possible for hyaluronic acid to have a better bioavailability while at the same time conserving its physicochemical characteristics and its biological properties, and also a process for the production of such compositions.
As a solution to this stated problem, a first subject of the invention is a pharmaceutical or cosmetic composition, in particular for topical and/or parenteral application, comprising, as sole active ingredients, in a physiologically acceptable medium:
Preferably, the composition does not comprise any oligosaccharide.
The composition according to the invention in fact contains, as active ingredients, only the retinoid(s) and the inhibitor(s) of hyaluronic acid degradation; any other active ingredient is excluded.
A second subject of the invention is a process for the manufacture of such a pharmaceutical or cosmetic composition, comprising a step of mixing at least one compound chosen from retinoids, salts thereof and derivatives thereof, and at least one inhibitor of hyaluronic acid degradation with a physiologically acceptable medium. Preferably, the process according to the invention also comprises a step of preparing a physiologically acceptable medium, in which the active agents are mixed.
Finally, a third subject of the invention is the use of at least one compound chosen from retinoids, salts thereof and derivatives thereof, and of at least one inhibitor of hyaluronic acid degradation, or of a composition according to the invention, for the manufacture of a medicament for use in the treatment and/or prevention of dermatological conditions.
A pharmaceutical or cosmetic composition according to the invention clearly increases the bioavailability of a hyaluronic acid, which is also included in the composition, or which is administered separately. The composition according to the invention makes it possible to space out the applications of hyaluronic acid and to reduce the number thereof and it is highly effective in filling wrinkles, fine lines, fibroblast depletions and any scars.
The applicant has demonstrated a decrease in hyaluronic acid catabolism in human keratinocytes, in vivo, to which hyaluronic acid, an inhibitor of hyaluronic acid degradation and a retinoid are applied, in the absence of oligosaccharide. Thus, surprisingly, the absence of oligosaccharide in a composition comprising an inhibitor of hyaluronic acid degradation and a retinoid confers better stability and better bioavailability on the hyaluronic acid also applied. Such a composition is more effective than the prior art compositions, and especially compositions comprising oligosaccharides, in filling wrinkles, fine lines, fibroblast depletions and any scars, and also when moisturizing the skin.
The invention will be understood more clearly upon reading the nonlimiting description which will follow.
The composition according to the invention comprises, in a physiologically acceptable medium, at least one retinoid and/or salts thereof and/or derivatives thereof and one inhibitor of hyaluronic acid degradation. In particular, it does not comprise any oligosaccharide.
The composition according to the invention may also comprise hyaluronic acid. Alternatively, the composition according to the invention may be administered to an individual to whom hyaluronic acid is administered independently. In this case, the hyaluronic acid may be included in a separate composition, which may be administered simultaneously or else at a different time to that of the administration of the composition according to the invention. The separate composition comprising hyaluronic acid may be administered topically, orally or parentally, for example by injection.
The term “physiologically acceptable medium” is intended to mean, according to the invention, a medium compatible with the skin and, optionally, with its appendages (eyelashes, nails, hair) and/or the mucous membranes.
In the compositions according to the invention, the retinoid and/or salts thereof and/or derivatives thereof, and the inhibitor of hyaluronic acid degradation and, if applicable, the hyaluronic acid, are present in proportions that can range from 0.0000001% to 10%, preferably from 0.00001% to 1% by weight, relative to the total weight of the composition. In the present description, and unless otherwise specified, it is understood that, when concentration ranges are given, they include the upper and lower limits of said range.
The compositions according to the invention comprise hyaluronic acid.
The term “hyaluronic acid” is intended to mean a ubiquitous natural polysaccharide which exists in the same form from the simplest bacterium to humans. It is a polysaccharide alternately composed of D-glucuronic acid and N-acetylglucosamine, linked to one another by alternating beta-1,4 and beta-1,3 glycosidic linkages. According to Saari H et al., Differential effects of reactive oxygen species on native synovial fluid and purified human umbilical cord hyaluronate. Inflammation 17 (1993): 403-415, the polymers of this recurring unit may be between 102 and 104 kDa in size, in vivo, hyaluronic acid taken from the umbilical cord having a weight of 2500 kDa.
Advantageously, the hyaluronic acid is natural.
The term “natural hyaluronic acid” is intended to mean a hyaluronic acid that is non-stabilized and non-chemically modified in the form, in particular, of esters or amides or in the form of derivatives having “intra- and/or interchain bridges” (crosslinked), such modifications affecting the physicochemical characteristics and the biological properties of said hyaluronic acid, and also what becomes of it after administration.
The compositions according to the invention comprise a retinoid and/or salts thereof and/or derivatives thereof, taken alone or as a mixture.
Among the retinoids that may be part of the compositions according to the invention, retinol, retinal, retinoic acid (or tretinoin), adapalene or salts and derivatives thereof, taken alone or as a mixture, will preferably be chosen, more preferably retinol.
The term “retinoid salt” is intended to mean in particular an alkali metal salt, an alkaline-earth metal salt or an organic amine salt. The term “retinoid derivative” is intended to mean in particular the esters, such as retinyl palmitate, retinyl acetate, retinyl stearate, retinyl oleate, retinyl propionate or else retinyl linoleate.
Advantageously, the retinoids used in the compositions according to the invention are retinoids that exist naturally in the human body.
The compositions according to the invention do not in particular comprise any oligosaccharide.
The term “oligosaccharide” is intended to mean polymers formed from a number n (with n less than or equal to 100) of monosaccharides by glycosidic linkage, in particular any oligosaccharide which limits the penetration of hyaluronic acid into the cells of the skin, in particular the keratinocytes and the fibroblasts. Among the oligosaccharides, mention may be made of hyaluronic acid oligomers, for instance hyaluronic acid dimers to dodecamers, said dimer comprising one component hyaluronic acid disaccharide unit, and the dodecamer comprising six of these disaccharide units, in particular hyaluronic acid tetramers to hexamers, especially the hyaluronic acid pentamer. The molecular weight of a hyaluronic acid disaccharide unit is approximately 400 Da. An oligomer of one to six hyaluronic acid disaccharide units therefore has a molecular weight of between 400 and 2400 Da.
The term “oligomer” is intended to mean, according to the IUPAC in Pure Appl. Chem., Vol. 68, No. 12, pp. 2287-2311, 1996, a molecule of intermediate molecular weight, the structure of which comprises a small quantity of molecules having a lower molecular weight. Reference is made to a molecule having an intermediate molecular weight, when the removal of one or of a few constituent units will significantly modify the properties of the molecule.
The compositions according to the invention also comprise an inhibitor of hyaluronic acid degradation.
The term “inhibitor of hyaluronic acid degradation” is intended to mean a compound capable of reducing, or even blocking, either the extracellular or the intracellular catabolism of hyaluronic acid, preferably a compound capable of reducing, or even blocking, the extracellular catabolism of hyaluronic acid, more preferably a compound capable of inhibiting the extracellular hyaluronidase present in the skin.
Among the inhibitors of hyaluronic acid degradation, taken alone or as a mixture, that may be part of the compositions according to the invention, 1,2,3,4,6-penta-O-galloylglucose, apigenin, beta-escin, caltrin, cis-Hinokiresinol (CHR), echinacin, eicosatrienoic acid (C20:3), fenoprofen, gold sodium thiomalate, gossypol, heparin, hesperidin phosphate, indomethacin, L-ascorbic acid, L-ascorbic acid 6-hexadecanoate, L-carnitine, L-aminocarnitine, myochrisine (sodium aurothiomalate), N-tosyl-L-phenylalanine chloromethyl ketone (TPCK) and N-alpha-p-tosyl-L-lysine chloromethyl ketone (TLCK), phosphorylated hesperidin, poly(sodium 4-styrene-sulphonate) (T-PSS), polyoestradiol phosphate, polyphloretin phosphate, PS53 (a hydroquinone/sulphonic acid/formaldehyde polymer), sodium polystyrene sulphonate (N-PSS), sulphated 2-hydroxyphenyl monolactobioside, sulphated hydroquinone digalactoside, the sulphated verbascose, planteose and neomycin oligosaccharides, tetradecyl sodium sulphate (TDSS), a C14:1 to C24:1 unsaturated fatty acid with one double bond, urinary trypsin inhibitor (UTI), urolithin B, WSG, glycyrrhizin or glycyrrhetinic acid, and derivatives and/or analogues thereof will in particular be chosen. Glycyrrhizin, glycyrrhetinic acid, and derivatives and/or analogues thereof are preferred.
Advantageously, the inhibitors of hyaluronic acid degradation used in the compositions according to the invention are natural.
In the compositions according to the invention, the inhibitor is used at concentrations of between 10−9 M and 10−2 M, preferably between 10−6 M and 10−3 M.
The term “derivatives of glycyrrhizin or of glycyrrhetinic acid” is intended to mean in particular the salts, the substituted derivatives, the enantiomers and the racemates of said compounds.
As salts of said compounds, mention may be made of the salts obtained by addition of said compounds with an inorganic base, chosen in particular from sodium hydroxide, lithium hydroxide, calcium hydroxide, potassium hydroxide, magnesium hydroxide, ammonium hydroxide or zinc hydroxide, and alkali metal or alkaline-earth metal carbonates such as sodium, lithium, calcium, potassium, magnesium, ammonium or zinc carbonates and bicarbonates, or with an organic base, chosen in particular from methylamine, propylamine, trimethylamine, diethylamine, triethyl-amine, N,N-dimethylethanolamine, tris(hydroxymethyl)-aminomethane, ethanolamine, pyridine, picoline, dicyclohexylamine, morpholine, procaine, lysine, arginine, histidine, N-methylglucamine or else phosphonium salts such as alkylphosphonium salts, arylphosphonium salts, alkylarylphosphonium salts, alkenylarylphosphoniums or quaternary ammonium salts such as tetra-n-butylammonium salts. Such salts are in particular the potassium salt of glycyrrhetinic acid, the sodium salt of glycyrrhetinic acid, or else the monoammonium salt of glycyrrhetinic acid (ammonium glycyrrhetinate).
The term “analogue” is intended to mean in particular the enzymatic or biomimetic analogues of said compounds, capable of binding to the catalytic or noncatalytic site of hyaluronidases and of thus inhibiting their activation. Such analogues may be selected, in vitro, by means of hyaluronidase binding or inhibition assays according to the techniques conventionally used.
Advantageously, the derivatives and/or analogues should be of natural origin.
The compounds and derivatives and/or analogues thereof of natural origin are compounds in the pure state or in solution at various concentrations, obtained by various methods for extracting or hydrolysing biological material of natural origin.
In a known manner, the compositions according to the invention may also contain the usual adjuvants known to those skilled in the art.
The compositions according to the invention can be formulated for topical and/or parenteral application.
When they are for topical application, the compositions may be in any of the galenical forms normally used for topical administration. By way of nonlimiting example of topical compositions, mention may be made of compositions in liquid, pasty or solid form, and more particularly in the form of ointments, aqueous, aqueous-alcoholic or oily solutions, dispersions of the optionally two-phase lotion type, serum, aqueous, anhydrous or lipophilic gels, powders, impregnated pads, syndets, wipes, sprays, foams, sticks, shampoos, compresses, washing bases, emulsions of liquid or semiliquid consistency of the milk type, obtained by dispersion of a fatty phase in an aqueous phase (O/W) or vice versa (W/O), a microemulsion, suspensions or emulsions of soft, semiliquid or solid consistency of the white or coloured cream, gel or ointment type, suspensions of microspheres or nanospheres or lipid or polymeric vesicles, or microcapsules, microparticles or nanoparticles or polymeric or gelled patches for controlled release.
When they are for parenteral administration, the compositions according to the invention may be applied subcutaneously or intradermally. By way of nonlimiting example of parenteral compositions, mention may be made of compositions in the form of solutions or suspensions for perfusion or for injection.
By way of nonlimiting example given simply as an illustration and which can in no way limit the scope of the invention, hyaluronic acid may be administered in the form of an injectable aqueous solution, a composition according to the invention comprising retinol, and glycyrrhizin being administered in the form of a cream.
In the context of a combined administration of hyaluronic acid and of a composition according to the invention, the administration frequencies may be identical or different.
Advantageously within the context of the invention, the frequency of administration of hyaluronic acid injected in the form of an injectable aqueous solution may range from 4 to 24 months, preferably from 4 to 16 months, whereas those of the composition according to the invention, administered topically, for example in the form of a cream, may range from 1 to 7 days, preferably from 1 to 3 days.
According to a specific embodiment of the invention, the process for the manufacture of a composition comprises the steps of preparing a physiologically acceptable medium and of mixing an effective amount of retinol and of glycyrrhizin and/or derivatives thereof and/or analogues thereof.
The invention also relates to the use of at least one compound chosen from retinoids, salts thereof and derivatives thereof, and of at least one inhibitor of hyaluronic acid degradation, or of a composition as described above, for the manufacture of a cosmetic or pharmaceutical composition for use in the treatment, improvement and/or prevention of dermatological conditions.
More particularly, the invention relates to the use of at least one compound chosen from retinoids, salts thereof and derivatives thereof, and of at least one inhibitor of hyaluronic acid degradation, or of a composition as described above, for the manufacture of a cosmetic or pharmaceutical composition for use in the treatment, improvement and/or prevention of skin aging. The term “skin aging” is intended to mean wrinkles, fine lines, fibroblast depletions and scars. Such a medicament is suitable for the treatment of wrinkled and/or aged skin, and aims in particular to prevent and/or reduce the effects thereof. The treatment of wrinkles, fine lines, fibroblast depletions and any scars is carried out in particular by filling.
In particular, the composition according to the invention may be applied to the areas of the face or of the forehead that are marked with expression wrinkles.
The invention also relates to the use of at least one compound chosen from retinoids, salts thereof and derivatives thereof, and of at least one inhibitor of hyaluronic acid degradation, or of a composition as described above, for the manufacture of a cosmetic or pharmaceutical composition for use in reconstructive surgery.
The present invention will now be illustrated by means of the following examples.
Determination of the IC50 of GLZ, with or without Preincubation at 37° C.:
GLZ, at various concentrations, is or is not preincubated for 20 minutes at 37° C. in the presence of the enzyme. The enzyme reaction is triggered by adding the hyaluronic acid solution (time T0). After incubation for 20 minutes, the nonhydrolysed hyaluronic acid is precipitated by adding acidic bovine albumin solution.
In order to verify that the preincubation step has no effect on the stability of the hyaluronidase, an aliquot of a solution of the enzyme is placed at 37° C. for 20 minutes. Another aliquot is conserved in an ice bath for 19 minutes, and is then incubated at 37° C. for 1 minute. A solution of hyaluronic acid is then added to each aliquot (T0). After incubation for 15, 30 or 45 minutes, the nonhydrolysed hyaluronic acid is precipitated by addition of acidic bovine albumin solution.
After the precipitation step, the turbidimetry of the solutions is determined on a spectrophotometer at a wavelength of 600 nm. The optical density (OD) of these solutions is subtracted from the OD of a control solution of hyaluronic acid (of the same concentration) not hydrolysed by the enzyme. This difference in OD, which is inversely proportional to the concentration of hyaluronic acid, is used to measure the activity of the hyaluronidase.
The inhibitory effect of GLZ on the bovine hyaluronidase is shown in
The results obtained show that this effect is dose-dependent and that the concentration of GLZ which gives 50% inhibition (IC50) of the hyaluronidase activity is 400 μM without preincubation with the enzyme.
When the GLZ is preincubated for 20 minutes at 37° C. in the presence of the enzyme, the IC50 is 350 μM.
This composition is prepared in a manner that is conventional for those skilled in the art:
Injectable Solution No. 2 Containing Hyaluronic Acid, Coupled with a Cream According to the Invention
| Number | Date | Country | Kind |
|---|---|---|---|
| 0755026 | May 2007 | FR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/FR2008/050726 | 4/22/2008 | WO | 00 | 7/9/2010 |
