WO2009131208A1 - 抗アレルギー作用を有する新規乳酸菌と、該乳酸菌を含む抗アレルギー剤、食品及び医薬品組成物と、前記抗アレルギー剤の製造方法 - Google Patents
抗アレルギー作用を有する新規乳酸菌と、該乳酸菌を含む抗アレルギー剤、食品及び医薬品組成物と、前記抗アレルギー剤の製造方法 Download PDFInfo
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- WO2009131208A1 WO2009131208A1 PCT/JP2009/058141 JP2009058141W WO2009131208A1 WO 2009131208 A1 WO2009131208 A1 WO 2009131208A1 JP 2009058141 W JP2009058141 W JP 2009058141W WO 2009131208 A1 WO2009131208 A1 WO 2009131208A1
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- lactic acid
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/135—Bacteria or derivatives thereof, e.g. probiotics
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
- A23L7/00—Cereal-derived products; Malt products; Preparation or treatment thereof
- A23L7/10—Cereal-derived products
- A23L7/104—Fermentation of farinaceous cereal or cereal material; Addition of enzymes or microorganisms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
- A61K35/66—Microorganisms or materials therefrom
- A61K35/74—Bacteria
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/08—Antiallergic agents
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/225—Lactobacillus
Definitions
- the present invention relates to a novel lactic acid bacterium, an antiallergic agent containing the lactic acid bacterium, and a food and a pharmaceutical composition containing the antiallergic agent.
- the lactic acid bacterium is entrusted to the Patent Organism Depositary, National Institute of Advanced Industrial Science and Technology.
- the present invention relates to a lactic acid bacterium of Lactobacillus paracasei K71 strain deposited internationally under the number FERM BP-11098, an antiallergic agent containing the lactic acid bacterium, and a food composition and a pharmaceutical composition containing the antiallergic agent.
- IgE is an important factor in the immediate allergic reaction (type I allergy) seen in atopic dermatitis and hay fever.
- the production of IgE is induced by interleukin 4 (IL-4) in which B cells undergo an IgE class switch.
- the main source of IL-4 is T H 2 cells.
- Helper T cells such as T H 1 cells and T H 2 cells are stimulated by antigen presentation from cells such as dendritic cells and macrophages, and are affected by cytokines such as IL-4 and IL-12. And differentiate. Differentiation of T H 1 cells is induced by IL-12, and differentiation of T H 2 cells is induced by IL-4.
- IgE binds to high affinity IgE receptors on the cell surface of mast cells and basophils.
- an antigen allergen or the like
- the high affinity IgE receptor is cross-linked, leading to the release of chemical mediators such as histamine by degranulation, and further to the production of lipid mediators such as leukotrienes.
- causes allergic symptoms such as the beginning. In the state where production of IgE is enhanced, allergic symptoms are serious.
- Hyposensitization therapy is a treatment method that alleviates the symptoms by ingesting (or injecting) allergens, which are causative agents of allergic diseases, gradually from small amounts. Since this treatment involves the risk of anaphylaxis due to allergen administration, it must be performed under strict management by a physician. At the present stage, desensitization therapy is not a completely established treatment, and there is still room for improvement in reliability, including long-term treatment and differences among individuals. Yes.
- lactic acid bacteria having abundant experience in food intake and having a function of suppressing the production of IgE are attracting attention.
- the antiallergic action of lactic acid bacteria is specific to strains, and lactic acid bacteria having such antiallergic action have been screened and are on the market as yogurt and lactic acid bacteria drinks.
- yogurt and lactic acid bacteria drinks may not be accepted due to personal preference.
- yogurt and lactic acid bacteria drinks may not be accepted due to personal preference.
- rice is a staple food for Japanese people, and at least one of the three meals is a food that must be ingested, even though the recent separation of rice is progressing.
- lactic acid bacteria having antiallergic action it is only necessary to mix lactic acid bacteria cultured in a tank or the like and polished rice, but the specific gravity and particle size of rice grains and lactic acid bacteria powder are different, These may be separated during storage, and only lactic acid bacteria may sink to the bottom of a storage container such as a rice bag. For this reason, even if a certain amount of rice is weighed, the rice does not always contain a desired amount of lactic acid bacteria. Therefore, it is difficult to always ingest an amount of lactic acid bacteria necessary for exerting an antiallergic action. Although it is possible as a technique to coat the surface of polished rice with lactic acid bacteria, it is unavoidable that a complicated operation is required and the cost is increased.
- a lactic acid bacterium having an antiallergic action which can be grown using rice, particularly polished rice, can be collected together with the rice in a state attached to the rice surface, and can be cooked and eaten, is developed. There is a need to develop food and pharmaceutical compositions that contain rice.
- the present invention refers to Lactobacillus paracasei (hereinafter referred to as Lactobacillus, abbreviated as “L.”), which has been internationally deposited under the accession number FERM BP-11098 at the National Institute of Advanced Industrial Science and Technology (AIST). ) Provide lactic acid bacteria of K71 strain.
- the present invention provides an antiallergic agent containing the lactic acid bacterium of the present invention.
- the lactic acid bacteria may be live bacteria.
- the lactic acid bacteria may be dead.
- the antiallergic agent of the present invention may contain the bacterial component of the lactic acid bacterium of the present invention.
- the present invention provides a food composition containing the antiallergic agent of the present invention.
- the present invention provides a pharmaceutical composition containing the antiallergic agent of the present invention.
- the present invention provides a food composition containing rice fermented using the lactic acid bacteria of the present invention, a pulverized product of the rice, or a rice obtained by cooking the rice or the pulverized product of rice.
- the present invention provides a method for producing an antiallergic agent comprising a step of inoculating a culture medium with the lactic acid bacteria of the present invention and culturing.
- the culture medium may be rice or crushed rice.
- the antiallergic agent may be a drug containing a substance having an action of suppressing or inhibiting an allergic reaction as a component.
- the process of degranulation of the signal due to the formation of the complex, and chemical mediators such as histamine and leukotriene released by degranulation are applied to various organs in the body such as the skin, respiratory organs, digestive organs, eyes, nose, etc. Including, but not limited to, processes that cause local anaphylaxis.
- the antiallergic agent of the present invention has an action of suppressing and / or inhibiting at least one of the above processes.
- the differentiation and maturation process of T H 2 cells is promoted by IL-4, but IL-12 promotes the differentiation and maturation of T H 1 cells, thereby producing T H 2 cells. Suppresses differentiation and maturation. Therefore, the process of differentiation and maturation of T H 2 cells can be suppressed by suppressing the production of IL-4 and promoting the production of IL-12.
- An antiallergic agent based on such a mechanism is a therapeutic agent that can be used as a causal therapy for allergic diseases. Moreover, since there is no danger of a side effect like an antihistamine and a steroid, it is preferable.
- the lactic acid bacteria of the present invention were screened by the tests shown in the following examples as lactic acid bacteria having antiallergic action and good growth on the surface of polished rice.
- the liquid culture of the lactic acid bacteria of the present invention may be under any conditions as long as the bacteria can grow, and the normal culture is performed using a normal medium (for example, MRS medium or vegetable juice) used for lactic acid bacteria culture. It can be cultured under conditions.
- the culture is started at a pH of 4.0 to 7.0, preferably 6.0 to 6.5, and the culture temperature is 35 ° C. to 42 ° C., preferably 37 ° C. to 40 ° C.
- the lactic acid bacteria can grow sufficiently by stationary culture, it is preferable to gently stir in order to uniformly disperse the medium components and the bacterial cells.
- the lactic acid bacteria grow, lactic acid accumulates in the medium, and the pH of the medium gradually decreases.
- the lactic acid bacteria can be recovered to some extent without controlling the pH during the culture, it is preferable to control the pH of the medium by adding calcium carbonate to the medium or by automatic pH control.
- the pH of the medium By controlling the pH of the medium to 4.0 to 7.0, preferably 6.0 to 6.5, high-density lactic acid bacteria can be obtained.
- the anti-allergic action is observed in the cells obtained by heat sterilization of the lactic acid bacteria of the present invention. Therefore, even if the lactic acid bacteria contained in the antiallergic agent of the present invention are live bacteria, that is, bacteria that are proliferating and / or metabolizing, they are dead bacteria, that is, those that are neither proliferating nor metabolizing. It can be a fungus.
- the antiallergic agent of the present invention is a microbial cell component of the lactic acid bacterium of the present invention and may contain a component having an antiallergic action.
- the food composition of the present invention may contain seasonings, coloring agents, preservatives and other food-acceptable ingredients in addition to the allergic agent of the present invention.
- the food composition of the present invention may be produced by fermentation using the lactic acid bacteria of the present invention, provided that the effect of the antiallergic agent of the present invention is not impaired.
- the lactic acid bacterium of the present invention and / or the fermented product of the lactic acid bacterium of the present invention may be manufactured by cooking rice or other heating, pressurizing or the like.
- the lactic acid bacteria of the present invention grown by liquid culture can be used as a food material having an antiallergic action as it is or after drying, but can also be used as a starter for fermenting polished rice. It is.
- lactic acid bacteria of the present invention When fermenting polished rice using the lactic acid bacterium of the present invention, it is only necessary to immerse the polished rice after washing in water and add the starter containing the lactic acid bacterium of the present invention to ferment it. Since the lactic acid bacteria of the present invention vigorously grow using the nutrition of the surface of the rice and adhere to the surface of the rice, most of the lactic acid bacteria can be obtained even if the fermented rice is received in the koji and then washed with water. Is still attached to the rice surface. 10 8 to 10 9 lactic acid bacteria are attached to 1 g of raw rice on the surface of the polished rice that has been fermented under appropriate conditions. The rice can be processed as raw rice by drying, and cooked rice containing antiallergic lactic acid bacteria can be obtained by adding water as it is without drying.
- the pharmaceutical composition of the present invention may contain a pharmacologically necessary substance and / or a pharmaceutically acceptable substance in addition to the allergic agent of the present invention.
- fermented lactic acid bacteria of the present invention having an anti-allergic action using polished white rice as a raw material, it is possible to easily and inexpensively obtain polished rice having anti-allergic lactic acid bacteria uniformly distributed on the surface.
- a staple food having anti-allergic action that can be cooked and continuously taken every day is provided.
- mouth The graph which shows the effect which repeated oral administration of a lactic acid bacterium has on the ovalbumin specific IgE level of an OVA sensitized mouse
- lactic acid bacteria used for screening are fermented foods made from rice (rice bran, rice bran) Newly separated from miso, sake lees, rice cakes, etc.).
- Table 1 lists the names of 39 strains of lactic acid bacteria that were confirmed to be species belonging to the genus Lactobacillus in the preliminary test.
- Serum total IgE and OVA-specific IgE were measured by sandwich ELISA using Murine Opt EIA ELISA set manufactured by Becton Dickinson. That is, when total IgE is measured, a plate coated with rat monoclonal anti-mouse IgE as a primary antibody is used, and appropriately diluted serum is added thereto, followed by biotinylated rat monoclonal anti-mouse IgE heavy chain as a secondary antibody. Antibody was used. When measuring OVA-specific IgE, ELISA was performed by the same operation using a plate coated with OVA instead of the primary antibody.
- erythrocyte lysis buffer 154 mM ammonium chloride, 14 mM sodium bicarbonate, 0.11 mM EDTA-2Na, pH 7.3
- penicillin G 100 U / mL
- streptomycin 100 mg / mL
- 10 mM HEPES-containing RPM1640 medium Sigma
- Fermented rice is crushed by placing 10 g of fermented rice and 90 mL of sterile physiological saline (0.85% NaCl) in a sterile bag with a special filter and attaching it to a stomacher (Oregano, Stomacker 400T) and running at 230 rpm for 120 seconds. Crushed.
- the pulverized fermented rice was appropriately diluted, applied to an LBS agar medium (manufactured by BBL) and cultured, and the number of lactic acid bacteria adhering to the polished rice surface was determined from the number of colonies formed.
- IL-4 promotes differentiation and maturation of T H 2 cells.
- IL-12 suppresses differentiation and maturation of T H 2 cells by promoting differentiation and maturation of T H 1 cells.
- a high concentration of IL-4 is present and IgE production is enhanced, leading to an allergic state. Become.
- lactic acid bacteria that suppress the production of IL-4 and promote the production of IL-12 alleviate the situation where T H 2 cells are dominant, that is, have an antiallergic action.
- Lactobacillus paracasei K71 strain grows well with polished rice, adheres strongly to polished rice, and is easy to recover. Therefore, Lactobacillus paracasei K71 strain was selected as the strain most suitable for the purpose of the present invention.
- Lactobacillus paracasei strain K71 is referred to as the lactic acid bacterium of the present invention.
- the lactic acid bacteria of the present invention have been isolated from sake lees and have been deposited internationally under the accession number FERM BP-11098 at the National Institute of Advanced Industrial Science and Technology and the Patent Biological Depositary Center.
- Microorganism 16S rRNA covers over 489,840 types, and after alignment, the full-length sequence or partial sequence is databased (Release 9.59, as of March 5, 2008), and Ribosomal Database Project II ( RDP II, http://rdp.cme.msu.edu/) (Maidak, BL, et al., 2001, Nucleic Acids Res., 29, 173-174). Therefore, as a result of searching the database for the sequence of SEQ ID NO: 1, L. paracasei, L. paracasei subsp.
- the homology to the nucleotide sequence of the 16S rRNA gene of J. Paramesei strain JCM8130 is 100%. paracasei subsp.
- the homology of the tolerans to the NBRC15906 strain was 99.9%.
- the nucleotide sequence of SEQ ID NO: 1 is L.P. C. casei strain ATCC334 also shows high homology to the nucleotide sequence of the 16S rRNA gene. Delaglio, F. and P. paracasei, which are the same species as each strain of Paracasei. (Int. J. Syst. Evol. Microbiol., 52: 285-287 (2002)). Therefore, L. casei's ATCC 334 strain is also described in L. p. Since it is presumed that there is a high possibility that it belongs to Paracasei.
- Casei's ATCC 334 strain was hit by a homology search, and the lactic acid bacterium of the present invention was transformed into L. cerevisiae. It cannot be said to belong to casei. L.
- the nucleotide sequence of SEQ ID NO: 1 is L. pylori. belonging to a cluster formed by two subspecies of Paracasei. paracasei subsp. It was identical to the nucleotide sequence of Paracasei 16S rRNA gene. Therefore, according to the analysis result of the nucleotide sequence of the 16S rRNA gene, the lactic acid bacterium of the present invention has L. There is a high possibility that it belongs to paracasei.
- the lactic acid bacterium of the present invention was a gram-positive gonococcus having no motility, fermenting glucose, and both catalase reaction and oxidase reaction were negative. These properties are attributed to L. cerevisiae whose assignment was suggested in the nucleotide sequence analysis of 16S rRNA gene. This is consistent with the general properties of lactobacilli such as paracasei.
- the lactic acid bacteria of the present invention fermented ribose, adonitol, galactose, fructose, dulcitol, etc., but did not ferment glycerol, D-arabinose, rhamnose, inositol, etc.
- the lactic acid bacteria of the present invention grew at 10 ° C.
- the lactic acid bacteria of the present invention are L. Paracasei subsp. There is a high possibility of belonging to paracasei.
- mice 18 6-week-old female mice (Balb / c) were purchased from Charles River and bred in a conventional environment. After 4 days of pre-feeding, the mice were divided into 3 groups of 6 animals each. One of them was orally administered 50 ⁇ L each of the lactic acid bacteria Lactobacillus paracasei strain K71 strain (20 mg / mL) of the present invention. Repeated administration (lactic acid bacteria administration group). One week after the start of administration, blood was collected from the tail vein at a frequency of once a week, and then a suspension of Al (OH) 3 and OVA was injected intraperitoneally in the same manner as in Example 1.
- lactic acid bacteria administration group One week after the start of administration, blood was collected from the tail vein at a frequency of once a week, and then a suspension of Al (OH) 3 and OVA was injected intraperitoneally in the same manner as in Example 1.
- the spleen was removed by the same method as in Example 1 after blood collection was completed, and spleen cells were collected. Distilled water was orally administered repeatedly instead of lactic acid bacteria suspension, and a group of animals in which a suspension of Al (OH) 3 and OVA was intraperitoneally injected weekly was sensitized, and distilled water was orally administered, and Al (OH) The group of animals that did not undergo intraperitoneal injection of the suspension of No. 3 and OVA were treated as non-sensitized groups, and blood collection and spleen extraction were performed in the same manner as in the lactic acid bacteria administration group.
- FIG. 1 shows the effect of repeated oral administration of lactic acid bacteria on the increase in the serum total IgE level of OVA-sensitized mice
- FIG. 2 shows the effect on the ovalbumin-specific IgE level.
- FIG. 3 The effect of repeated oral administration of lactic acid bacteria on IL-4 production in the culture supernatant of OVA-sensitized mouse spleen cells is shown in FIG. 3, and the total oral administration of lactic acid bacteria in the culture supernatant of OVA-sensitized mouse spleen cells is shown in FIG.
- the effect on IgE production is shown in FIG. 1-4, the symbols “a” and “b” indicate that there is a statistically significant difference (P ⁇ 0.05) between the two groups of experimental conditions, and the symbol “c” "" And “b” represents that the experimental condition group of "c” has a statistically significant difference (P ⁇ 0.05).
- allergen sensitization significantly increased serum IgE levels (FIG.
- NC mice which are atopic dermatitis model animals
- NC mice which are atopic dermatitis model animals
- NC male mice NC / Nga, Charles River
- CE-2 feed lactic acid bacteria administration group
- CE-2 feed normal CE-2 feed
- FIG. 5 shows the effect of repeated oral administration of lactic acid bacteria on the serum total IgE level of atopic dermatitis model animals
- FIG. 6 shows the effect of repeated oral administration of lactic acid bacteria on ear allergy symptoms in atopic dermatitis model animals. Show. 5 and 6, * indicates P ⁇ 0.05, and ** indicates P ⁇ 0.01.
- the serum total IgE amount (FIG. 5) and the clinical score (FIG. 6) were significantly reduced compared to the control group, and it was confirmed that the administration of lactic acid bacteria clearly reduced atopic dermatitis. .
- both the serum total IgE amount and the clinical score in the lactic acid bacteria administration group were significantly lower than those in the control group, and the administration of the lactic acid bacteria of the present invention clearly reduced atopic dermatitis. Confirmed to do.
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Abstract
Description
(1)スクリーニングに用いた乳酸菌の出所
スクリーニングに用いた乳酸菌は、米を原料とした発酵食品(米糠床、米麹味噌、酒粕、醪等)から新たに分離された。予備試験においてLactobacillus属に帰属する種であることを確認できた39種類の乳酸菌の菌株名を表1に列挙した。
オバルブミン(OVA)感作マウスより摘出した脾細胞を用いてin vitroでの抗アレルギー試験を行った。6週齢で購入した雌マウス(Balb/c、チャールス・リバー)3匹をSPF環境下で飼育し、1週間に一度の頻度で1mg/mLのAl(OH)3と2mg/mLのOVAとを含む懸濁液を1匹当たり0.5mLずつ腹腔内注射した。適宜尾静脈より採血し、血清総IgE量及びOVA特異的IgEレベルを確認した。なお、血清総IgE及びOVA特異的IgEの測定はそれぞれベクトン・ディッキンソン社製のMurine Opt EIA ELISAセットを用い、サンドイッチELISA法にて行った。即ち、総IgEを測定する場合にはラットモノクローナル抗マウスIgEを1次抗体としてコートしたプレートを用い、これに適宜希釈した血清を添加した後、2次抗体としてビオチン化ラットモノクローナル抗マウスIgE重鎖抗体を用いた。OVA特異的IgEを測定する場合には、1次抗体の代わりにOVAをコートしたプレートを用いて同様の操作によりELISAを行った。血清総IgE量及びOVA特異的IgEレベルが最も高い個体1匹を選出し、飼育開始28日後に脾臓を摘出した。摘出した脾臓をメスで細かく砕き、赤血球溶解バッファー(154mMの塩化アンモニウム、14mMの炭酸水素ナトリウム、0.11mMのEDTA-2Na、pH7.3)を添加して赤血球を取り除き、10%ウシ胎児血清(Difco社製)、ペニシリンG(100U/mL)、ストレプトマイシン(100mg/mL)及び10mMのHEPESを含むRPM1640培地(Sigma社製)により2×106細胞/mLとなるように希釈後、96穴マイクロタイタープレートに100μLずつ分注した。次に80μLのOVA溶液(1mg/mL)と20μLの加熱殺菌した乳酸菌懸濁液(1mg/mL)を加えた。二酸化炭素5%、37℃の環境下で7日間培養した後、培養液を遠心分離することにより脾細胞及び乳酸菌を除去した。培養上清に含まれるIL-4及びIL-12の濃度を、ベクトン・ディッキンソン社製のMouse Opt EIA ELISAセット マウスIL-4(カタログ番号555232)及びマウスIL-12(p70、カタログ番号555256)をそれぞれ用いて測定した。
精白米50gを洗米し、これに100mLの蒸留水を添加して浸漬した。この浸漬液に、MRS培地を用いて37℃で1夜培養した乳酸菌培養液(約109個/mL)を1mL添加して混合した後、38℃で1日保温した。浸漬水を捨て、約100mLの蒸留水による洗浄を3回行った後、発酵米を粉砕して、米表面に付着した乳酸菌を遊離・懸濁させた。発酵米の粉砕は、発酵米10gと90mLの滅菌生理食塩水(0.85% NaCl)を専用フィルター付き無菌バッグに入れてストマッカー(オレガノ、ストマッカー400T)に装着し、230rpmで120秒間運転して、粉砕した。粉砕された発酵米は、適宜希釈してLBS寒天培地(BBL社製)に塗布して培養し、生じたコロニー数から精白米表面に付着した乳酸菌数を求めた。
抗アレルギー活性及び精白米を用いた生育・付着試験の結果を表1に示す。
(1)16S rRNA配列の解析
当業者に周知な方法に従い、本発明の乳酸菌ラクトバチルス・パラカゼイK71株の菌体DNAを鋳型として遺伝子増幅した微生物16S リボソームRNA(以下、「rRNA」という。)遺伝子領域のポリヌクレオチド断片の配列を配列番号1に示す。微生物16S rRNAは、489,840種類以上にわたり、アライメントを取ったうえでその全長配列または部分配列がデータベース化されており(リリース9.59、2008年3月5日現在)、Ribosomal Database Project II(RDP II、http://rdp.cme.msu.edu/)を通じて利用可能となっている(Maidak、B.L.ら、2001年、Nucleic Acids Res.、29巻、173-174ページ)。そこで、配列番号1の配列について前記データベースを検索した結果、L. paracaseiの亜種である、L. paracasei subsp. paracaseiのJCM8130株の16S rRNA遺伝子のヌクレオチド配列に対する相同性は100%で、L. paracasei subsp. toleransのNBRC15906株に対する相同性は99.9%であった。なお、相同性検索では、配列番号1のヌクレオチド配列はL. caseiのATCC334株の16S rRNA遺伝子のヌクレオチド配列にも高い相同性を示すが、L. paracaseiの各菌株と同種であるとのDellaglio、F.らによる論文(Int. J. Syst. Evol. Microbiol.,52:285-287(2002))がある。そこで、L. caseiのATCC334株もL. paracaseiに帰属する可能性が高いと推察されるので、L. caseiのATCC334株が相同性検索でヒットするからといって本発明の乳酸菌がL. caseiに帰属するとはいえない。L. caseiのATCC334株以外で相同性検索において上位にヒットした微生物の16S rRNA遺伝子のヌクレオチド配列とクラスター解析を行ったところ、配列番号1のヌクレオチド配列はL. paracaseiの2つの亜種が形成するクラスターに属し、L. paracasei subsp. paracaseiの16S rRNA遺伝子のヌクレオチド配列と同一配列であった。したがって、16S rRNA遺伝子のヌクレオチド配列の解析結果によると本発明の乳酸菌は種レベルではL. paracaseiに帰属する可能性が高い。
本発明の乳酸菌ラクトバチルス・パラカゼイK71株の生理・生化学性状についての各種試験の結果は以下の表2、3及び4に示すとおりである。
(1)アレルゲン感作マウスへの効果
本発明の乳酸菌ラクトバチルス・パラカゼイK71株を、アレルゲン感作マウスに反復経口投与した場合のIgE及びアレルギーに影響するサイトカイン(IL-4等)の産生量の変化を以下の手法により調べた。
アトピー性皮膚炎モデル動物であるNCマウスを用いて、本発明の乳酸菌ラクトバチルス・パラカゼイK71株の反復経口投与がアトピー性皮膚炎の進行に及ぼす影響を調べた。5週齢で購入したNC雄マウス(NC/Nga、チャールス・リバー)12匹を、CE-2飼料(日本クレア)にて3日間予備飼育し、その後6匹ずつの2群に分けした。一方の群にはラクトバチルス・パラカゼイK71の乾燥菌体0.05%を含むCE-2飼料(乳酸菌投与群)を、他方の群には通常のCE-2飼料(対照群)を与え、引き続き3週間飼育した。
精白米(新潟県産コシヒカリ)3合を洗米し、900mLの蒸留水に浸漬した。これにMRS培地中37℃で一夜培養した培養液9mLを加えて緩やかに混合し、38℃で1日保温した。その後浸漬水を捨て、約500mLの蒸留水で3回洗浄した後に適量の蒸留水を加えて電気炊飯器に仕込んだ。炊飯前の米を少量採取し、実施例1と同様の操作で乳酸菌数を測定した結果、米(乾燥重量換算)1g当たり4.3×108個の乳酸菌が検出された。通常の条件で炊飯を行い、炊飯米の官能評価を行ったところ、通常の炊飯米と遜色の無いおいしいごはんであった。
Claims (10)
- 独立行政法人 産業技術総合研究所特許生物寄託センターに受託番号FERM BP-11098として国際寄託されたラクトバチルス・パラカゼイ(Lactobacillus paracasei)K71株の乳酸菌。
- 請求項1に記載の乳酸菌を含むことを特徴とする抗アレルギー剤。
- 前記乳酸菌は生菌であることを特徴とする、請求項2に記載の抗アレルギー剤。
- 前記乳酸菌は死菌であることを特徴とする、請求項2に記載の抗アレルギー剤。
- 請求項1に記載の乳酸菌の菌体成分を含むことを特徴とする抗アレルギー剤。
- 請求項2ないし5のいずれかに記載の抗アレルギー剤を含むことを特徴とする食品組成物。
- 請求項2ないし5のいずれかに記載の抗アレルギー剤を含むことを特徴とする医薬品組成物。
- 請求項1に記載の乳酸菌を用いて発酵させた米か、該米の粉砕物か、前記米又は米の粉砕物を炊飯調理して得られる飯かを含むことを特徴とする食品組成物。
- 請求項1に記載の乳酸菌を培地に接種して培養するステップを含むことを特徴とする、抗アレルギー剤の製造方法。
- 前記培地は米又は米の粉砕物であることを特徴とする、請求項9に記載の抗アレルギー剤の製造方法。
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US12/989,052 US8361481B2 (en) | 2008-04-25 | 2009-04-24 | Lactic acid bacterium having anti-allergic activity and pharmaceutical composition |
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