Antimicrobial agent for staphylococcus comprising an extract of Ganoderma Lucidum

Abstract: An antimicrobial agent for Staphylococcus comprising an extract of the pileus of Ganoderma lucidum, thereby treating and preventing various infections and inflammations caused by Staphylococcus including Methicillin Resistant Staphylococcus aureus.

Description: Background of the Invention 1.Field of the Invention The present invention concerns an efficacious antimicrobial agent for bacteria of genus Staphylococcus (hereinafter referred to as Staphylococcus) which has pathogenicity for human beings, domestic or wild animals and pets. The antimicrobial agent of the present invention is effective for various infections and inflammations of human beings and animals caused by Staphylococcus such as pyogenic dermatitis, conjunctivitis, sinusitis, otitis, cystitis, pneumonia, myelitis, arthritis, visceral abscess. The said agent is also effective to Methicillin Resistant Staphylococcus aureus ( hereinafter referred to as MRSA ), being a serious problem as a pathogen of nosocomial infections. 2.Description of the Related Art Staphylococcus, especially Staphylococcus aureus, are important pathogenic bacteria concerning infections, inflammations and pyosis of human beings and animals. They also produce an enterotoxin which reacts as a pathogen of food poisoning. Recently, MRSA having resistance to many kind of antibiotics, has raised serious problems in case of nosocomial infections or grave enteritis caused by microbial selection and substitution. Since MRSA shows resistance to almost all antibiotics used practically such as penicillin and methicillin, it infects to, for example, postoperative patients with reduced resistance and causes intractable pyosis and inflammation. Recently, use of Ganoderma lucidum in various physiologically active agents has been known. Thus, FR-A-2 368 958 discloses extracts of the fruit body, mycelium or spores of Ganoderma lucidum and pharmaceutical compositions comprising them. Especially, its effectiveness as medicament having anti-hepatitic, anti-cancer and anti-inflammatory activity is reported in this document. However, it fails to provide any composition having activity against Staphylococcus strains. Further, Allonia, Vol. 30 (0):61-64, 1990-1991 reports on antimicrobial activity of various strains of Basidiomycetes. Especially, it is mentioned that growth of B. subtilis was inhibited by Gonaderma lucidum . However, use of Gonaderma lucidum as antimicrobial agent having antimicrobial activity against growth of Staphylococcus strains is nowhere mentioned in D2. Therefore, valid antimicrobial agents were long sought to be developed so as to overcome the damage of Staphylococcus especially of MRSA, a notable agent, however, has not yet to be seen for proper usage. Summary of the Invention Accordingly, it is an object of the present invention to provide an effective antimicrobial agent comprising an extract of the pileus of Ganoderma lucidum for the preparation of a medicament for treating or preventing Staphylococcal infections. Another object of the invention is to provide an effective antimicrobial agent comprising an extract of the pileus of Ganoderma lucidum for the preparation of a medicament for treating or preventing infections caused by Staphylococcus aureus, especially MRSA. Other and further objects of the present invention will become obvious upon an understanding of the illustrative embodiments about to be described or will be indicated in the appended claims. Description of the Preferred Embodiments The present inventors have been investigating in various manners to find an effective antimicrobial agent for Staphylococcus, especially for Staphylococcus aureus and MRSA and it results in finding an extract of the pileus of fruit body of Ganoderma lucidum has an excellent inhibition effect of the growth of Staphylococcus, especially MRSA. It is known that Ganoderma lucidum was first found in China and has been utilized as a herb medicine during the last 2000 years. In recent years various studies for the said herb has been made concerning clinical effect, chemical component analysis and pharmacological effect and the herb is applied to diseases such as angina pectoris, hyperlipemia, acute viral hepatitis and leukopenia. In view of foregoing situations, the present inventors have tried to develop an effective antimicrobial agent for Staphylococcus using Ganoderma lucidum, which has not yet been studied so much. The antimicrobial agent for Staphylococcus according to the present invention has a feature in that it comprises an extract of the pileus of Ganoderma lucidum. More preferably, the said extract is the extract of ripe pileus with many spores. Among fruit body of Ganoderma lucidum, pileus has more excellent inhibition effect than other parts. A method for preparing the said extract is not restricted in the present invention, and various known methods can be applied. For example, the antimicrobial agent of the present invention may be prepared by extracting the crushed pileus of Ganoderma lucidum with hot water for several hours, so as to obtain maximum concentration, spray drying. Thus, powder of the said extract is obtained. The said powder is, for example, used as a powder drug itself or dissolved in aqueous solvent and used as a pharmaceutical solution. The antimicrobial agent of the present invention can be applied widely to bacteria of genus Staphylococcus, such as Staphylococcus epidermidis, Staphylococcus saprophyticus, Staphylococcus aureus including MRSA and the like. There is no particular restriction for the administration form. The formulations for oral administration illustratively include tablets, pills, granules, soft and hard capsules, dispersions, fine granules, powders, emulsions, suspensions, syrups, elixirs and the like. The formulation for parenteral administration include, for example, ointments, lotions, tonics, sprays, suspensions, oils, emulsions, suppositories and the like. For the formulation of the effective ingredient of the present invention, routine methods should be followed, employing appropriately surfactants, excipients, coloring agents, flavorings, sweetening agents, preservatives, stabilizers, buffers, suspending agents, isotonic agents, vitamin K, vitamin C, vitamin E, folic acid and other routinely employed substances. The content of the extract of the pileus of Ganoderma lucidum should be dosed appropriately, depending on the extent of the condition of the patient, administration form, the age and the like. The recommended dosage for external preparations for skin is within a range of 5 to 15 weight per cent as the amount of the effective ingredient (powdered extract), more preferably, 7.5 to 12.5 weight per cent and an appropriate amount thereof should be applied to lesions several times. Generally the dosage is within 5 to 35 mg/kg per day as the amount of the effective ingredient per adult for oral and enthral administrations. 2 or 3 times administration per day is recommended. The invention will be understood more readily with reference to the following examples; however these examples are intended to illustrate the invention and are not to be construed to limit the scope of the invention. Example 1. (solution) Sliced pileus of Ganoderma lucidum was chipped and immersed in purified water, then boiled for approximately 9 hours. Thus the extract of pileus of Ganoderma lucidum was obtained and the same was spray dried to be resulted in powder of the extract, the water contain thereof was approximately 3 to 4 weight per cent (hereinafter referred to as "pure powder"). The pure powder was dissolved in purified water as in Table 1 and the resulted solutions were applied to the following experiment. Experiment (1) Test strain The following strains were used for the experiment. Staphylococcus epidermidis Staphylococcus saprophyticus Staphylococcus aureus Methicillin Resistant Staphylococcus aureus (MRSA) (2) Method Above-mentioned 4 strains were inoculated into heart infusion bouillon for proliferation cultivation and drug sensitivity of each was measured in accordance with Halo-test, that is, disc agar diffusing capacity test. Five nutrient agar mediums and five "Staphylococcus No.110 mediums" (manufactured by Nissui & Co., registered trade mark ) were used. Each strain proliferation cultured was smeared on each plate medium. Discs were cut out from filter paper ("No.1 Filter Paper" manufactured by Toyo Filter Paper Mfg.) into 9 mm diameter, after sterilized, they were immersed in solutions of the extract as shown in Table 1. Three piles of 5 discs of the same concentration were placed on each medium at three positions with triangle shape, then the plate mediums were incubated in an incubator at 37°C for 48 hours. By measuring the width of growth inhibition zone (clear zone) using a caliper, each value of the width obtained from 10 plate mediums (five nutrient mediums and five "Staphylococcus No. 110 mediums") was averaged and the result is shown in Table 1. Width of growth inhibition zone (mm) Strain Contents of pure powder of the extract of Ganoderma lucidum (wt% ) 0.1 0.25 0.5 1.0 2.5 5.0 7.5 10.0 12.5 Staphylococcus epidermidis 1.7 2.0 2.6 3.2 4.7 7.8 11.0 15.0 18.0 Staphylococcus aureus 1.6 2.0 2.6 3.2 4.7 7.9 11.0 15.0 18.0 Staphylococcus saprophyticus 1.8 2.2 2.8 3.5 4.9 8.0 12.0 15.2 18.5 MRSA 1.6 2.0 2.5 3.2 4.6 7.7 10.8 14.7 17.8 As apparently shown in Table 1, the antimicrobial agent of the present invention shows a remarkable growth inhibition effect, namely, antimicrobial effect even at the concentration of 0.1 weight per cent of the solution of powdered extract. Further, it shows a notable effect to MRSA which has resistance to majority of conventional antibiotics and antimicrobial agents. The growth inhibition effect of the agent of the present invention increases as the concentration of the powdered extract increases, and a conspicuous effect was obtained when above 5 weight per cent of the solution was applied. As shown in the above, the antimicrobial agent of the present invention has an excellent growth inhibition effect for Staphylococcus The antimicrobial agent of the present invention is effective for therapy and prevention of various infections, pyosis, inflammations and food poisoning caused by Staphylococcus. Furthermore, the agent of the present invention has also a notable antimicrobial effect for MRSA, for which scarcity of workable drugs has been known in the past. So using the antimicrobial agent of the present invention, nosocomial infections caused by MRSA can be treated and prevented. An antimicrobial agent for Staphylococcus comprising an extract of the pileus of Ganoderma lucidum, thereby treating and preventing various infections and inflammations caused by Staphylococcus including Methicillin Resistant Staphylococcus aureus.

Claims: Use of an effective amount of an antimicrobial agent comprising an extract of the pileus of Ganoderma lucidum for the preparation of a medicament for treating or preventing Staphylococcal infections. Use as claimed in claim 1, whereby the growth of Staphylococcus aureus is inhibited. Use as claimed in claim 1, whereby the growth of Methicillin Resistant Staphylococcus aureus is inhibited. Use as claimed in any one of claims 1 to 3, wherein said extract is a solution. Use as claimed in any one of claims 1 to 3, wherein said extract is a spray dried powder.

Inventors: FUJIWARA HIROSHI, SAWAI KEN, FUJIWARA, HIROSHI, SAWAI, KEN
Applicants: TOYO PHARMA KK, TOYO SEIYAKU KABUSHIKI KAISHA
Application year: 1993
Main classification: A61K35
IPC codes: A61P31, A61K36