Cosmetic or pharmaceutical and particularly dermatological, composition containing an extract of tephrosia, particularly Tephrosia purpurea

Description

The present invention relates essentially to the use of an extract of Tephrosia, in particular Tephrosia purpurea for preparing a pharmaceutical composition, in particular a dermatological composition, or as a cosmetic agent, and also to a method of cosmetic treatment constituting an application thereof.
Plants of the genus Tephrosia are subtropical plants widely distributed, in particular in India and in Sri Lanka.
A species of the genus Tephrosia that is particularly preferred in the context of the invention is the plant of the species Tephrosia purpurea. It is a perennial plant having a height of 30 cm to 100 cm, giving 4 to 6 seeds per pod, and having red flowers. The species Tephrosia purpurea is particularly known in India and it is known essentially in Ayurvedic medicine, i.e. in traditional Indian medicine. Various parts have been used to treat a variety of diseases: bronchial, liver, and kidney diseases, and blood purification (see article by Pandey in Quart. J. Crude Drug Res. 13 (1975), pp. 65-68). Seeds of Tephrosia purpurea have also been used for hypoglycemic activity (see article by Rahman et al., in Indian J. Med. Res. 81, April 1985, pp. 418-421). In vitro antimicrobial activity of Tephrosia purpurea is also known (see article by Agarwal et al. in Indian J. Physiol. Pharmac., Vol. 31, No. 4, October-December 1987, pp. 284-286) using a root extract in 90% alcohol in a Soxhlet apparatus.
After intensive research on plants of the genus Tephrosia, and in particular of the species Tephrosia purpurea, the present inventors have discovered, unexpectedly, that extracts, and in particular extracts of the seeds, of the plant Tephrosia, in particular Tephrosia purpurea, present powerful stimulation activity for the enzyme adenylate cyclase. It is known that this enzyme transforms ATP into AMPc and pyrophosphate. Because of this activity, extracts of the genus Tephrosia, in particular of the species Tephrosia purpurea, are valuable for an application in cosmetics or in pharmacy, in particular in dermatology, in body-slimming activity, in anti-inflammatory activity, in pigmenting activity by acting on melanocytes, and in anti-aging activity.
Thus, in a first aspect, the present invention covers the use of an extract of a plant of the genus Tephrosia, in particular the species Tephrosia purpurea, as an active substance for preparing a pharmaceutical composition, in particular a dermatological composition, presenting activity in stimulating the enzyme adenylate cyclase, body-slimming activity, anti-inflammatory activity, pigmenting activity, and anti-aging activity, in particular when applied topically, optionally in a medium, vehicle, or excipient that is pharmacologically, and in particular dermatologically, acceptable.
The invention also covers the use of an extract of a plant of the genus Tephrosia, in particular of the species Tephrosia purpurea, as a cosmetic agent for stimulating the enzyme adenylate cyclase, to obtain a body-slimming effect, to obtain a pigmenting effect, or to obtain an anti-aging effect, in particular when applied topically.
In an advantageous embodiment, the above-specified extract is a seed extract of a Tephrosia plant, in particular a seed extract of the species Tephrosia purpurea.
It should be observed that the plant Tephrosia purpurea is also known, in particular according to the Napralert.RTM. database under the following synonymous names: Cracca purpurea, Galeduba lanceaefolia, Galeduba purpurea, Galepa tinctoria, Tephrosia galegoides, Tephrosia indigofera, Tephrosia lobata, and Tephrosia maxima, all of which are naturally covered by the present invention.
In an advantageous embodiment, this seed extract is a hydroalcoholic extract with a C.sub.1 -C.sub.6 alcohol that is linear or cyclic branched. A particularly preferred alcohol is methanol or ethanol. The relative proportions of water and alcohol may range over wide limits. Nevertheless, substantially equal volume proportions are preferred.
In a second aspect, the present invention also covers a method of cosmetic treatment for obtaining stimulation of the enzyme adenylate cyclase to obtain a body-slimming effect, to obtain a pigmenting effect, or an anti-aging effect, characterized in that it comprises topical application on the areas concerned of a patient, in particular the epidermis or the hair, of a cosmetically effective quantity of an extract of a plant of the genus Tephrosia, in particular the species Tephrosia purpurea, optionally in a cosmetically acceptable excipient, medium, or vehicle.
Advantageously, in any of the preceding aspects, 0.001% to 5%, and preferably 0.01% to 5%, by weight of extract is used relative to the total weight of the composition.
Other objects and advantages of the invention appear clearly in the light of the following explanatory description made with reference to various embodiments of the invention given purely by way of illustration and that do not in any way limit the scope of the invention. Unless specified otherwise, percentages given in the description and the claims are given by weight.

EXAMPLE 1
Making a plant extract from Tephrosia purpurea
1000 grams (g) of Tephrosia purpurea seeds purchased commercially were taken and ground and passed through a 1 mm screen. The screening was steeped for 24 h in 5 liters (l) of hydroalcoholic extraction solvent constituted in this case by a 50/50 V/V methanol-water mixture.
It was refluxed for 1 h.
It was then filtered on paper (pressure could have been used). It was washed in cold methanol.
The alcohol and the water were then vacuum evaporated off until they had completely disappeared from the filtrate.
The residue was weighed, giving 80.11 g of extract of non-uniform appearance comprising a clear crystalloid and a dark paste.
The raw extract contained about 50% dry matter and 50% residual solvents.
It was suitable for use as such, or it could have been further purified by conventional methods well known to the person skilled in the art.
EXAMPLE 2
2,365 kg of commercially available seeds of the plant Tephrosia purpurea were ground and screened with a 1 mm screen, and then degreased with petroleum ether.
The ground and degreased seeds were then subjected to extraction for 2 hours in a Soxhlet apparatus with about 10 l of ethanol.
After the solvent had been evaporated off, a residue was obtained in the form of a brownish gum weighing about 58 g.
EXAMPLE 3
Use of Tephrosia purpurea extract to show stimulation of adenylate cyclase activity
Certain substances act as intracellular messengers, and as a result they are essential constituent substances of cells that adapt the functioning of cells to the requirements of the organism. Such messengers include 3',5' adenosine which is a cyclic monophosphate (AMPc). This molecule is metabolized from adenosine 3',5'-triphosphate by an enzyme called adenylate cyclase.
The theoretical reaction is as follows: ##EQU1## Theory
Cell membranes are initially obtained by culturing to confluence fibroblasts of the 3T3 F442A line commercially available from Flow Laboratories.
These fibroblast cell membranes which constitute an enzyme source, are incubated in a reaction medium in the presence of ATP at 37.degree. C. for a predefined length of time.
The resulting AMPc is measured by radioimmunoassay. Taking the basal activity, i.e. activity without an effector, as being 100%, it is possible to determine the influence of an effector on the enzyme system. If the activity is greater than 100%, then there is an activator effect of adenylate cyclase, and if the activity is less than 100%, then on the contrary an inhibitor effect is demonstrated.
Implementation
Cell membranes are purified from the fibroblast in culture.
In this context, it should be observed that purification of cell membranes releases numerous enzymes into the assay medium. Two of these enzymes are undesirable in implementing the test. They comprise firstly Na.sup.+, K.sup.+ ATPase which transform ATP into adenosine diphosphate, and secondly phosphodiesterase 3',5'-AMPc which degrades cyclic AMP into AMP. Thus, in order to obtain reliable results from the test, it is essential to inhibit those two enzymes. The first is inhibited by means of ouabain, and the second by means of theophylline.
The reaction medium is thus constituted by:
50 .mu.l of a 5 mM solution of adenosine 3',5'-triphosphate (ATP) as substrate;
100 .mu.l of a 20 mM solution of ouabain as an inhibitor of ATPase;
100 .mu.l of a 20 mM solution of theophylline as an inhibitor of phosphodiesterase; and
100 .mu.l of a solution containing 0.05 g/l dry matter of the effector.
After incubation, the reaction is stopped by heating for 10 minutes to 100.degree. C., centrifuging, and recovering the supernatent to measure the AMPc by radioimmunoassay (kit reference 1117 from the French company Immunotech).
Results
The results of tests are given in the table below:
TABLE 1______________________________________ Tephrosia Positive purpurea reference = at 0.05 g/l Basal forskoline dry extract activity at 0.05 g/l from Example 2______________________________________% activity 100 225 185______________________________________
It can be seen very clearly from the above results that the extract from the plant Tephrosia purpurea possesses large significant activity in stimulating the enzyme adenylate cyclase. This activity is relatively close to that of the positive reference as constituted by forskoline, even though the plant extract does not contain that molecule.
Thus, Tephrosia extracts, in particular Tephrosia purpurea extracts, constitute an interesting alternative for forskoline in its use in preparing cosmetic or pharmaceutical compositions.
Applications of the present invention are, in particular, those which stem from biological processes in which AMPc plays a role. Of such applications, those preferred in the invention are preparing slimming compositions, pigmenting compositions for the skin or the hair, anti-inflammatory compositions, and compositions for opposing the effects of aging.
EXAMPLE 4
Demonstrating lipolytic activity in the composition of the invention
Evaluating the action of the composition of the invention on adipocytes in culture
It was decided to evaluate the effectiveness of compositions of the invention as lipolytic agents on a line of mouse pre-adipocytes, such as a 3T3 F442A line commercially available from Flow Laboratories, which have been selected for their ability to convert into adipocytes if culture conditions make that possible.
(In application of the method of H. Green & C. Kehinde, Cell, 1 (1974), 113.)
This line constitutes a model for studying in vitro adipocyte differentiation while providing the possibility, when the adipocyte phenotype is achieved, of studying extracellular regulation of cell functioning in accordance with the invention. This differentiation, and modulation thereof, are accompanied by a certain number of morphological and biochemical changes, and in particular biochemical changes concerning the release of glycerol during lipolysis.
It is thus convenient to verify the effectiveness of compounds to be tested by measuring the activity of the enzyme glycerol-3-phosphate dehydrogenase (written G3PDH) which is involved in the following lipid generating reaction: ##STR1##
Thus, enzyme activity can be measured using the method of assaying the release NADH by the method described by J. Pairault et al. in Proc. Nat. Acad. Sci., Volume 6 (1979), pp. 5138-42.
These experiments were performed as follows:
1) Culture conditions
The pre-adipocytes were seeded in 35 mm diameter Petri dishes (20,000 cells/dish) in the presence of Dulbecco's Modified Eagle Medium (DMEM) containing 5% calf serum, plus 5% fetal calf serum.
The medium was renewed twice with DMEM medium plus 10% fetal calf serum.
Under such conditions, the culture reached confluence in 1 week (D=D0), at which stage adipocyte differentiation was activated by adding insulin at a concentration of 1% by weight of culture medium. There were also two changes of the DMEM culture medium plus 10% fetal calf serum and 1% insulin.
The cells presented an advanced differentiated state 1 week after confluence (D=D7).
2) Treatment-viability
The cells were treated with the substances to be tested at stage D7.
The treatment consisted in replacing the culture medium either by medium only as a reference, or else by the same medium but containing the substance to be tested at various concentrations.
To assay G3PDH activity, the culture medium was recovered 7 days after treatment (D=D14).
3) Assaying G3PDH enzyme activity on day D14
The monolayer of cells was recovered by scraping and it was vigorously homogenized in a 25 mM TRIS-HCl buffer, pH 7.4, with 1 mM EDTA at 4.degree. C. G3PDH activity was assayed on the cell particle supernatent after centrifuging.
The assay, performed using the above-mentioned Pairault assay method, measured G3PDH enzyme activity per milligram of protein. The protein content was determined by the protein assay method described by J. Lowry in Biol. Chem., 193 (1951), pp. 265-75, with enzyme activity being expressed in nanomoles/min/mg of protein.
Three tests were performed per sample or per reference.
The following substances were tested:
a) a first reference substance for which the DMEM medium had added thereto 7.5 .mu.l of ethanol for 6 ml of culture medium;
b) the same medium but having 60 .mu.l of DMSO (dimethylsulfoxide) added to 6 ml of culture medium;
c) the same medium but having added thereto an extract of Coleus forskohlii containing forskoline, which is commercially available, at a concentration of 0,025 g/l dry matter diluted in 7.5 .mu.l of ethanol for 6 ml of culture medium;
d) a substance in which the above DMEM medium had added thereto 0.2 g/l dry extract of Tephrosia purpurea as obtained from Example 2, diluted in 60 .mu.l of DMSO for 6 ml of culture medium;
e) a substance in which the DMEM medium had added thereto 0.1 g/l dry extract of Tephrosia purpurea as obtained from Example 2, diluted in 60 .mu.l of DMSO for 6 ml of culture medium; and
f) a substance in which the DMEM medium had added thereto 0.05 g/l dry extract of Tephrosia purpurea as obtained from Example 2, diluted in 60 .mu.l of DMSO for 6 ml of culture medium.
The results obtained are given in Table 2 below:
TABLE 2______________________________________ G3PDH activity expressed as nanomoles of NADH released per min/ml ofSubstance under test protein______________________________________Ethanol reference 382.68DMSO reference 392.36Coleus forskohlii 176.48Tephrosia (0.2 g/l) 155.23Tephrosia (0.1 g/l) 353.03Tephrosia (0.05 g/l) 369.64______________________________________
It can be seen very clearly from the results of Table 2 above that the extract of the plant Tephrosia purpurea possesses considerable significant activity in inhibiting the activity of G3PDH, as shown by the small quantity of NADH released. In addition, from a concentration 0.02 g/l, this activity is similar or slightly greater than the activity obtained with the extract of Coleus forskohlii which contains forskoline, known for its activity in stimulating adenylate cyclase and its effect on lipolyses.
It can be advantageous to inhibit G3PDH activity using a substance that does not contain forskoline, thus providing an alternative of interest to forskoline in its use for preparing cosmetic or pharmaceutical compositions for the activities mentioned above.
The present invention is described below with reference to various examples of formulations for cosmetic or pharmaceutical compositions, in particular dermatological compositions.
EXAMPLE 5
Body slimming cream
Tephrosia purpurea seed extract of Example 1 1%
Excipient for cream q.s.p. 100%
This cream is applied at least once a day for 2 to 3 weeks to areas of the body having fatty substances, until the desired slimming effect is obtained.
EXAMPLE 6
Pigmenting cosmetic composition
This composition comprises the following ingredients:
Tephrosia purpurea seed extract of Example 1 0.5%
Ordinary cosmetic gel excipient q.s.p. 100%
The gel is applied to areas of the skin that are to be pigmented until the desired effect is obtained.
EXAMPLE 7
Anti-inflammatory pharmaceutical composition, in particular a dermatological composition
This composition comprises the following ingredients:
Tephrosia purpurea seed extract of Example 1 0.2%
Pharmaceutically acceptable excipient q.s.p. 100%
EXAMPLE 8
Anti-aging cosmetic composition
This composition comprises the following ingredients:
Tephrosia purpurea seed extract of Example 1 0.1%
Usual cosmetic excipient q.s.p. 100%
This composition is applied to areas of the skin where an anti-aging effect is sought after, and it is applied for a sufficient period of time, generally of the order of several weeks to several months depending on the subject.

Claims

1. A method of performing a treatment of body zones selected from the epidermis and the hair, comprising stimulating the enzyme adenylate cyclase by applying on the body zones a stimulating effective amount of an extract of a plant of the genus Tephrosia.
2. The method of claim 1, wherein said plant is of the species Tephrosia purpurea.
3. The method of claim 1, wherein said extract is administered as a composition having a concentration of said extract ranging between 0.001% and 5% by weight with respect to the total weight of the composition.
4. The method of claim 1, wherein said extract is an extract obtained by use of an extraction solvent selected from the group consisting of a C.sub.1 -C.sub.6 alcohol and a C.sub.1 -C.sub.6 hydroalcohol.
5. The method of claim 1, wherein the extract is selected from the group consisting of methanol and ethanol.
6. The method of claim 1, wherein said extract is a seed extract.
7. The method of claim 1, wherein said extract is a seed extract of the species Tephrosia purpurea.
8. The method of claim 1, wherein said extract is a 50/50 V/V methanol-water solvent extract of Tephrosia purpurea seeds.
9. The method of claim 1, wherein said extract is an ethanol extract of the plant Tephrosia purpurea.
10. A method for providing a cosmetic effect for a person, comprising delivering to said person an effective amount for said cosmetic effect of an extract of a plant of the genus Tephrosia.
11. The method of claim 10, wherein said cosmetic effect is for slimming.
12. The method of claim 11, wherein said extract is administered as a composition having a concentration of said extract ranging between 0.001% to 5% by weight with respect to the total weight of the composition.
13. The method of claim 10, wherein said cosmetic effect is for pigmenting.
14. The method of claim 10, wherein said cosmetic effect is for reducing signs of aging.
15. The method of claim 10, wherein said cosmetic effect is anti-inflammatory.
16. The method of claim 10, wherein said plant is of the species Tephrosia purpurea.
17. The method of claim 10, wherein said extract is administered as a composition having a concentration of said extract ranging between 0.001% to 5% by weight with respect to the total weight of the composition.
18. The method of claim 10, wherein said extract is an extract obtained by use of an extraction solvent selected from the group consisting of a C.sub.1 -C.sub.6 alcohol and a C.sub.1 -C.sub.6 hydroalcohol.
19. The method of claim 18, wherein the solvent is selected from the group consisting of methanol and ethanol.
20. The method of claim 10, wherein said extract is a seed extract.
21. The method of claim 10, wherein said extract is a seed extract of the species Tephrosia purpurea.
22. The method of claim 10, wherein said extract is a 50/50 V/V methanol-water solvent extract of Tephrosia purpurea seeds.
23. The method of claim 10, wherein said plant is an ethanol extract of the plant Tephrosia purpurea.
24. The method of claim 10, comprising applying said extract topically on body zones selected from the epidermis and the hair.
25. A method for performing a pharmaceutical treatment selected from the group consisting of a slimming treatment and an anti-inflammatory treatment on a subject, comprising delivering to the subject an effective amount for said pharmaceutical treatment of an extract of a plant of the genus Tephrosia.
26. The method of claim 25, wherein said plant is of the species Tephrosia purpurea.
27. The method of claim 26, wherein said extract is administered as a composition having a concentration of said extract ranging between 0.001% and 5% by weight with respect to the total weight of the composition.
28. The method of claim 25, wherein said extract is administered as a composition having a concentration of said extract ranging between 0.001% and 5% by weight with respect to the total weight of the composition.
29. The method of claim 25, wherein said extract is an extract obtained by the use of an extraction solvent selected from the group consisting of a C.sub.1 -C.sub.6 alcohol and a C.sub.1 -C.sub.6 hydroalcohol.
30. The method of claim 29, wherein the solvent is selected from the group consisting of methanol and ethanol.
31. The method of claim 25, wherein said extract is a seed extract.
32. The method of claim 25, wherein said extract is a seed extract of the species Tephrosia purpurea.
33. The method of claim 25, wherein said extract is a 50/50 V/V methanol-water solvent extract of Tephrosia purpurea seeds.
34. The method of claim 25, wherein said plant is an ethanol extract of the plant Tephrosia purpurea.
35. The method of claim 25, comprising applying said extract topical on body zones selected from the epidermis and the hair.

Priority Claims (1)

Number	Date	Country	Kind
93 09283	Jul 1993	FRX

PCT Information

Filing Document	Filing Date	Country	Kind	102e Date	371c Date
PCT/FR94/00956	7/28/1994			1/26/1996	1/26/1996

Publishing Document	Publishing Date	Country	Kind
WO95/03780	2/9/1995

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Number	Name	Date
4373023	Langer et al.	Feb 1983
4863611	Bernstein et al.	Sep 1989
4882318	Vlodavsky et al.	Nov 1989
4897348	Johnson et al.	Jan 1990
5211850	Shettigar et al.	May 1993

Foreign Referenced Citations (1)

Number	Date	Country
WO 9102977	Mar 1991	WOX

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Cosmetic or pharmaceutical and particularly dermatological, composition containing an extract of tephrosia, particularly Tephrosia purpurea

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