JP2012254959A - Il-17 production inhibitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IL-17 production inhibitor.SOLUTION: The IL-17 production inhibitor containing fucoxanthin, fucoxanthinol or derivatives thereof, a Th17 cell differentiation inhibitor, and a composition for preventing or treating a disease or condition associated with IL-17 or Th-17 cells are provided.

Description

  The present invention is for the prevention or treatment of IL-17 production inhibitors, Th17 cell differentiation inhibitors and IL-17 or Th17 cell-related diseases or conditions containing fucoxanthin, fucoxanthinol or their derivatives as active ingredients. Relates to the composition.

  IL-17, a type of interleukin (IL), is known to induce the production of inflammatory cytokines. In recent years, Th17 cells (helper T cell type 17) that produce IL-17 have been found, and it is clear that IL-17 and Th17 cells are closely related to autoimmune diseases and non-infectious inflammatory diseases. It has become.

  In recent years, foods (health foods, functional foods, health supplements, foods for specified health use, etc.) have been used for the treatment and prevention of diseases that can be said to be intermediate between drug therapy and general therapy. In addition, food materials that focus on IL-17 production have been developed. For example, Patent Document 1 discloses a specific lactic acid bacterium that suppresses IL-17 production when co-cultured with mouse spleen cells, a fermented dairy product fermented with the lactic acid bacterium, and the fermented dairy product as an active ingredient for inhibiting IL-17 production. The medicine or food-drinks, etc. contained as are disclosed.

  As a treatment for inflammatory diseases with a focus on IL-17, US Pat. No. 6,057,049 is characterized by IL-23 antagonists inhibiting IL-17 production and increased expression of IL-17 in mammalian subjects. Disclosed are methods for the treatment of inflammatory diseases (such as allergic diseases) comprising administering an effective amount of an antagonist of IL-23 to the subject. Retinoic acid and synthetic retinoids are also known as components that suppress IL-17 production and have an effect on suppressing autoimmune diseases such as inflammatory bowel disease (Non-patent Document 1).

  On the other hand, fucoxanthin is a kind of carotenoid that is characteristically contained in seaweed, and has attracted special attention in recent years. It promotes fat burning, reduces white adipocytes, antioxidant, anticancer, antidiabetic, and suppresses angiogenesis. It is a food material that has been reported to have action and anti-inflammatory action. For example, it has been reported that fucoxanthin has a protective action against cell damage caused by UV-B irradiation (Non-patent Document 2).

  The anti-inflammatory effect reported so far for fucoxanthin is that fucoxanthin has an anti-inflammatory effect against infectious inflammation (endotoxin-induced uveitis) induced by lipopolysaccharide (LPS) due to external factors. (Non-Patent Document 3).

JP 2010-115126 A JP 2011-042658 A

J Leukoc Biol. 86 (4): 959-69 (2009) J Photochem Photobiol B. 95 (2): 101-7 (2009) Exp Eye Res. 81 (4): 422-8 (2005)

  There is an increasing need for foods and pharmaceuticals having therapeutic or preventive effects on autoimmune diseases and non-infectious inflammatory diseases. There is also a need for products that are highly effective and that can be taken safely over the long term and that have less economic burden. In addition, although fucoxanthin is known as a food material having various actions, it has a relationship with IL-17 and Th17 cells, and has a preventive and therapeutic action on autoimmune diseases and non-infectious inflammatory diseases. ,unknown.

  Under the background as described above, the problem to be solved by the present invention is to provide a new IL-17 production inhibitor.

  As a result of intensive studies in order to solve the above-mentioned problems, the present inventor has found that fucoxanthin and its derivative fucoxanthinol have an IL-17 production inhibitory action and an IL-17 production inhibitory Th17 from naive T cells. It has been found that it has an action to suppress differentiation into cells and is useful for treatment of diseases related to IL-17 and Th17 cells such as autoimmune diseases and non-infectious inflammatory diseases. Further, the present invention was completed by finding a method for easily extracting fucoxanthin from inexpensive seaweed that is distributed in large quantities for food.

The present invention is as follows.
[1]
An IL-17 production inhibitor containing fucoxanthin, fucoxanthinol or a derivative thereof.
[2]
A Th17 cell differentiation inhibitor containing fucoxanthin, fucoxanthinol or a derivative thereof.
[3]
A composition for prevention or treatment of a disease or condition associated with IL-17 or Th17 cells, comprising fucoxanthin, fucoxanthinol or a derivative thereof.
[4]
The composition according to [3], wherein the disease or condition is an autoimmune disease or a non-infectious inflammatory disease.
[5]
The composition according to [4], wherein the disease or condition is selected from the group consisting of rheumatoid arthritis, systemic lupus erythematosus, multiple sclerosis, psoriasis, Crohn's disease, ulcerative colitis and food allergy.
[6]
The agent or composition according to any one of [1] to [5], wherein fucoxanthin, fucoxanthinol or a derivative thereof is derived from seaweed.
[7]
The agent or composition according to [6], further comprising an ω-3 polyunsaturated fatty acid selected from octadecatetraenoic acid, eicosapentaenoic acid and α-linolenic acid.
[8]
The agent or composition according to any one of [1] to [7], containing 1 mg to 100 mg of fucoxanthin, fucoxanthinol or a derivative thereof in terms of dry matter per 1 g.
[9]
The agent or composition according to any one of [1] to [7], which is a beverage and contains 5 mg to 2500 mg of fucoxanthin, fucoxanthinol or a derivative thereof in terms of dry matter per 500 mL.
[10]
The agent or composition according to any one of [1] to [9], wherein the fucoxanthin, fucoxanthinol or a derivative thereof is fucoxanthin, fucoxanthinol or a salt thereof.
[11]
The agent or composition according to any one of [1] to [9], wherein fucoxanthin, fucoxanthinol or a derivative thereof is derived from an ethanol extract of brown algae.
[12]
The IL-17 production inhibitor according to [1], wherein IL-17 production is suppressed by suppressing differentiation of naive T cells into Th17 cells.
[13]
The Th17 cell differentiation inhibitor according to [2], wherein differentiation into Th17 cells is suppressed by inducing regulatory T cells from naive T cells.
[14]
A composition for immunomodulation containing fucoxanthin, fucoxanthinol or a derivative thereof.

  According to the present invention, a new IL-17 production inhibitor and a Th17 cell differentiation inhibitor can be provided. In addition, according to the present invention, a composition for preventing or treating diseases or conditions related to IL-17 or Th17 cells, such as autoimmune diseases and non-infectious inflammatory diseases, can be provided. Furthermore, according to the present invention, it is possible to provide the above-mentioned agent and composition with less economic burden, which can be taken safely for a long period of time, using inexpensive raw materials distributed in large quantities for food. .

In Example 1, the amount of IL-17 produced when various amounts of various components are added to the medium and CD4 positive spleen cells are cultured is shown. In Example 2, the number of IL-17 producing Th17 cells and the number of Foxp3 positive regulatory T cells when various amounts of various components are added to the medium and CD4 positive CD62L positive T cells are cultured are shown.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. In addition, this invention is not limited to the following embodiment, It can implement by changing variously within the range of the summary.

  The present invention includes an IL-17 production inhibitor, a Th17 cell inhibitor, a composition for preventing or treating a disease or condition associated with IL-17 or Th17 cells, and a composition for immunomodulation (hereinafter simply referred to as “the composition of the present invention”). Also referred to as "things"). The composition or the like of the present invention contains fucoxanthin, fucoxanthinol or a derivative thereof (hereinafter also simply referred to as “active ingredient of the present invention”) as an active ingredient.

Fucoxanthin (C ₄₂ H ₅₈ O ₆ ) is a major carotenoid in brown algae and has the following structure.

Fucoxanthinol (C ₄₀ H ₅₆ O ₅ ) is a compound obtained by liberating an acetyl group by hydrolysis of fucoxanthin and has the following structure.

  The active ingredient of the present invention may be a derivative in which a part of the above structure is altered or modified as long as it has a desired action (IL-17 production inhibitory action, Th17 cell differentiation inhibitory action, etc.). Examples of the fucoxanthin or fucoxanthinol derivative include physiologically acceptable salts, esters, prodrugs, and the like. Note that fucoxanthinol is a kind of fucoxanthin derivative, and fucoxanthin is a kind of fucoxanthinol derivative.

  Among the derivatives of fucoxanthin or fucoxanthinol, physiologically acceptable salts are not particularly limited, and examples thereof include alkali metal salts (sodium salts, potassium salts, etc.), alkaline earth metal salts (magnesium salts, Calcium salts, etc.), hydroxide salts or carbonates thereof, and salts with alkali metal alkoxides (sodium methoxide, potassium t-ptoxide, etc.). Further, acid addition salts obtained by adding inorganic acids (hydrochloric acid, sulfuric acid, phosphoric acid, etc.) and organic acids (maleic acid, citric acid, fumaric acid, etc.), amine addition salts, amino acid addition salts, and the like can also be mentioned. In addition, the hydrate of said salt is also contained in the salt here.

  Among the derivatives of fucoxanthin or fucoxanthinol, the ester is not particularly limited as long as it is an ester generated by an esterification reaction with a carboxylic acid. Examples of the carboxylic acid include formic acid, acetic acid, and lactic acid.

  Of the derivatives of fucoxanthin or fucoxanthinol, a prodrug is metabolized in vivo after being administered to a living body to express a desired action (IL-17 production inhibitory action, Th17 cell differentiation inhibitory action, etc.). Means a compound. Fucoxanthinol and Amarousciaxanthin A are known as metabolites of fucoxanthin in vivo. For example, compounds that are produced as metabolites after administration to the living body are also described above. Included in prodrugs. In addition, fucoxanthin or fucoxanthinol, which is converted into a prodrug for the purpose of improving stability and absorbability, reducing side effects, and the like, is also included in the above prodrug.

  As the active ingredients of the present invention, fucoxanthin, fucoxanthinol or derivatives thereof, commercially available products or chemically synthesized products may be used, but more simply from seaweed. An extracted seaweed extract (hereinafter, a seaweed extract obtained by extracting seaweed with a solvent may be simply abbreviated as “seaweed extract”) may be used. When the seaweed extract is used, since the seaweed contains the ω-3 polyunsaturated fatty acid described later, the composition of the present invention containing the ω-3 polyunsaturated fatty acid together with the active ingredient of the present invention is easy. Can get to.

  The seaweed used as a raw material for the seaweed extract is not particularly limited as long as it contains the active ingredient of the present invention, but brown algae is preferable from the viewpoint of containing a large amount of the active ingredient of the present invention, and is easily available at low cost. From the viewpoint, wakame, kombu, mozuku and the like can be used. Plants such as leaves, stems, flowers, and skins of the above-ground parts excluding such seaweed seeds can be used as raw materials, and it is preferable to use leaf parts from which hard stem parts have been removed as raw materials.

  About said raw material, the active ingredient of this invention may be extracted directly from a raw plant body, and may be extracted after grind | pulverizing into a puree form and obtaining seaweed puree. The plant body may be extracted after being dried once, or a powdered material after drying may be extracted. Commercial seaweed powder may be used.

  Further, a seaweed solution may be prepared from the above raw materials and used for extraction. The seaweed solution is not particularly limited as long as it is a solution containing the components derived from the above-mentioned raw materials and containing the active ingredient of the present invention. Examples of the seaweed solution include a solution obtained by adding water or warm water to the seaweed puree, a seaweed powder solution obtained by dissolving or mixing seaweed powder in water or warm water, and the like. The seaweed solution may contain a solid content of a plant body (such as a leaf).

  The method of extracting the raw material or seaweed solution with a solvent can be performed according to a conventionally known method, and is not particularly limited. For example, an extraction solvent is added to and suspended in the raw material or seaweed solution. After stirring, the solid matter is removed by centrifugation or suction filtration, and the liquid part is recovered, whereby a seaweed extract can be obtained.

  The extraction solvent is not particularly limited as long as the active ingredient of the present invention can be extracted, but is preferably an organic solvent that can be an extraction solvent for food additives, such as ethanol, methanol, ethyl acetate, hexane, etc. alone or in combination. Can be used. From the viewpoint of being inexpensive and safe, ethanol can be preferably used.

  As a specific example of the extraction treatment, for example, about 30 to 80% ethanol is added so as to be about 5 to 50 times the amount of the dry raw material, and stirred at room temperature to about 60 ° C. for about 15 to 60 minutes. Can be mentioned. Extraction can be repeated as needed. The present inventors have confirmed that the seaweed extract obtained by performing the extraction treatment under such conditions also contains ω-3 polyunsaturated fatty acids.

  The ω-3 polyunsaturated fatty acid is an unsaturated fatty acid having a plurality of double bonds at the ω-3 position, and an animal cannot be biosynthesized in the body. Examples of ω-3 polyunsaturated fatty acids that are abundant in seaweed include, for example, octadecatetraenoic acid (stearidonic acid), eicosapentaenoic acid (essential fatty acid), and α-linolenic acid (essential fatty acid). Various indications have been reported. Therefore, in one aspect, the composition or the like of the present invention further contains an ω-3 polyunsaturated fatty acid selected from octadecatetraenoic acid, eicosapentaenoic acid and α-linolenic acid. In addition to the action of the active ingredient, the action of these ω-3 polyunsaturated fatty acids can also be provided.

  The seaweed extract may be in the form of a solution or, if desired, a concentrate obtained by performing a concentration treatment with an evaporator or the like, a dry product obtained by performing a drying treatment, or a freezing treatment. It may be a frozen product. Whether the obtained seaweed extract contains the active ingredient of the present invention can be confirmed by a conventional method such as HPLC using a standard product. The obtained seaweed extract may be in any form such as a solution (aqueous solution and oil solution), concentrate, dried product, etc., and may be used as it is, or may be obtained by further purification. The purified product may be added to the following pharmaceuticals and foods and drinks to obtain the composition of the present invention. In particular, when the composition of the present invention also contains the above ω-3 polyunsaturated fatty acid, it may be preferable to use the seaweed extract without further purification.

  Fucoxanthin and fucoxanthinol have an IL-17 production inhibitory effect and a Th17 cell differentiation inhibitory effect, as described in Examples below. Therefore, a composition containing fucoxanthin, fucoxanthinol or a derivative thereof is used for prevention or treatment of an IL-17 production inhibitor, a Th17 cell differentiation inhibitor, and a disease or condition associated with IL-17 or Th17 cells. It can be used as a composition.

  The IL-17 production inhibitory action can be confirmed with reference to, for example, the method described in Example 1 described later. The Th17 cell differentiation inhibitory action can be confirmed with reference to, for example, the method described in Example 2 described later. The present inventors have confirmed that fucoxanthin and its derivative fucoxanthinol, among carotenoids of various types, have the above-described action.

  It is known that retinoic acid, which has been reported to inhibit Th17 cell differentiation and the like, is derived from vitamin A in vivo and the in vivo concentration is kept constant by homeostasis. Therefore, even if a large amount of vitamin A is ingested, there is no significant change in the retinoic acid concentration in the living body. On the other hand, it is considered that fucoxanthin and fucoxanthinol are less affected by metabolism in vivo after ingestion and can exhibit the above-described desired action in vivo.

  IL-17 induces the production of inflammatory cytokines and inflammatory mediators (IL-1, IL-6, IL-8, G-CSF, MCP-1, TNF-α, NOS-2, metalloproteases, chemokines, etc.) It is known to do. Therefore, the IL-17 production inhibitor can also suppress the production of the above-mentioned inflammatory cytokines and inflammatory mediators by suppressing the production of IL-17. Therefore, the IL-17 production inhibitor may be useful in the treatment or prevention of diseases involving the above inflammatory cytokines and inflammatory mediators. In addition, it is known that the concentration of IL-17 is significantly increased in various autoimmune diseases and non-infectious inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, psoriasis, ulcerative colitis, Crohn's disease and the like. It is done. Therefore, an IL-17 production inhibitor can be useful in the treatment or prevention of these diseases.

  Therefore, in the present specification, a disease or a condition related to IL-17 differs from a healthy state in the amount of inflammatory cytokines and inflammatory mediators whose production is induced by IL-17 and / or IL-17. Refers to a disease or condition.

  Th-17 cells are one subset of helper T cells. T cells produced in the bone marrow circulate in the bloodstream as naive T cells after differentiation and maturation in the thymus, but differentiate into each subset upon stimulation by various cytokines. For example, naive T cells usually differentiate into Th17 cells upon stimulation with TGF-β and IL-6, and differentiate into regulatory T cells upon stimulation with TGF-β alone.

  In addition to IL-17, Th-17 cells are known to have the ability to produce cytokines such as IL-2, IL-6, TNF-α, and IL-22. In addition, Th-17 cells are known to be involved in autoimmune diseases. Th-17 cells have also been found to be associated with autoimmune diseases (eg, rheumatoid arthritis, multiple sclerosis, psoriasis, etc.), inflammatory bowel disease, and the like.

  Therefore, in the present specification, a disease or condition related to Th-17 refers to a disease or condition in which the amount of cytokine induced to be produced by Th-17 and / or Th-17 differs from a healthy condition. .

  More particularly, diseases or conditions associated with IL-17 or Th-17 as used herein include autoimmune diseases and non-infectious inflammatory diseases. Examples of autoimmune diseases include rheumatoid arthritis, systemic lupus erythematosus, multiple sclerosis, psoriasis, etc. Examples of non-infectious inflammatory diseases include inflammatory bowel diseases (Crohn's disease and ulcerative colitis) ), Food allergies and the like.

  In the present specification, the non-infectious inflammatory disease means an inflammatory disease caused by an excessive response to self or the like regardless of external factors such as bacterial infection.

  Further, in the present specification, by taking (preferably oral intake) when suffering from mild to moderate autoimmune disease or inflammatory disease, or when transitioning from active phase to remission phase by drugs, IL- A composition that causes a 17 production-suppressing action and / or a Th17 cell differentiation-suppressing action may be referred to as an immunomodulating composition.

  The composition etc. of this invention can be used as food-drinks or a pharmaceutical. From the viewpoint of ease of ingestion, the composition of the present invention can be preferably used as a food or drink.

  Examples of the food and drink include supplements, foods for specified health use, functional nutritional foods, health foods, functional foods, health supplements, and normal foods and drinks. Preferred forms of normal foods and drinks are foods and beverages such as candy, jelly, tablet confectionery, beverages, soup, noodles, rice crackers, Japanese confectionery, frozen confectionery, baked confectionery, etc., from the viewpoint of preventing oxidation of the active ingredient of the present invention Preferably, it is a packaged beverage such as fruit juice beverage, vegetable juice, fruit vegetable juice, tea beverage, coffee beverage, sports drink, soft drink. These foods and drinks can be produced by adding fucoxanthin, fucoxanthinol or derivatives thereof, or seaweed extracts containing them, using methods known to those skilled in the art.

  Fucoxanthin, fucoxanthinol or their derivatives or the above seaweed extract containing them can be ingested by oral administration in liquid, semi-fluid or solid form due to their low taste specific to taste and smell It can be administered in the form of powders, granules, tablets, capsules, etc. by itself or mixed with excipients or the like for convenience in formulation.

  When the composition or the like of the present invention is used as a food or drink, the seaweed extract can be used as the food or drink as it is in any form such as a solution, a concentrate, a dried product, or a frozen product. Moreover, the composition of this invention can also be utilized as a compounding agent of various food-drinks. For example, when the above-mentioned seaweed extract is obtained as a solution (aqueous solution or oil solution), it can be used as it is as a beverage or in the above food or drink. The seaweed extract can also be made into a thick liquid composition by concentration under reduced pressure to an appropriate concentration. Moreover, said seaweed extract is excellent in storage stability by making it a dry substance. The dried product can also be used as it is as a food or drink, or blended with the above food or drink.

  When the composition of the present invention is used as a food or drink, fucoxanthin, fucoxanthinol or a derivative thereof is blended in an amount of about 0.01 mg to 100 mg, preferably about 1 mg to 100 mg, in terms of dry matter per gram. be able to. For example, when the composition of the present invention is used as a beverage, it can be blended preferably in an amount of 5 mg to 2500 mg, more preferably 10 mg to 1,000 mg per 500 mL in terms of dry matter. For example, when the composition of the present invention is used as a supplement, about 0.1 mg to 10 mg can be blended per 1 g in terms of dry matter. In order to achieve the blending amount, it can be appropriately mixed with other raw materials, additives and the like. In general, it is known that the amount of fucoxanthin in seaweed is at most about 0.1% of the dry weight, and the amount of fucoxanthinol in seaweed is known to be even smaller.

  The number of intakes is not particularly limited, but is preferably 1 to 3 times a day, and the number of intakes may be increased or decreased as necessary.

  The above-mentioned food or drink has an autoimmune disease preventive effect, a non-infectious inflammatory disease preventive effect, more specifically, an inflammatory bowel disease (Crohn's disease or ulcerative colitis) preventive effect (for example, suppression of inflammation of the digestive tract) Effects, abdominal pain alleviation, defecation improvement, etc.), joint pain alleviation, rheumatoid arthritis prevention, systemic lupus erythematosus prevention, multiple sclerosis prevention, psoriasis prevention, food allergy reduction, etc. It may be a food or drink with the indication.

  When the composition of the present invention is used as a pharmaceutical product, fucoxanthin, fucoxanthinol, or a derivative thereof or a seaweed extract containing them is added as a pharmaceutically acceptable excipient and used as a pharmaceutical product. be able to. Examples of pharmaceutical dosage forms include known dosage forms such as liquids, liquids such as pastes, and solids such as powders, granules, and tablets. More specifically, tablets, capsules, granules, fine granules, powders, solutions, syrups, chews, lozenges and other oral preparations, ointments, gels, creams, patches, external preparations, injections , Sublingual agents, inhalants, eye drops, suppositories, and the like, and tablets, capsules, powders, granules, and injections are preferable.

  The above medicaments can be administered to animals, especially mammals. Examples of mammals include humans, dogs, cats, cows, horses and the like, with humans being preferred.

  The dosage of the above pharmaceuticals can be appropriately adjusted according to various conditions such as the activity of individual drugs, patient symptoms, age, weight, etc., for example, fucoxanthin, fucoxanthinol or derivatives thereof, In terms of dry matter, it can be administered preferably at a dose of 5 mg to 2,500 mg, more preferably at a dose of 10 mg to 1,000 mg, and even more preferably at a dose of 10 mg to 100 mg. Similarly, in the case of a medicine containing a seaweed extract, it can be administered so as to be the above-mentioned amount of active ingredient in terms of dry matter.

  The number of administrations is not particularly limited, but is preferably 1 to 3 times a day, and the number of administrations may be increased or decreased as necessary. The administration method is not particularly limited, but fucoxanthin is absorbed from the intestinal tract, so oral intake is preferable.

  When the composition of the present invention contains ω-3 polyunsaturated fatty acid, the content is not particularly limited, but for example, it can be contained in an amount of about 0.1 mg to 500 mg per 1 g.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to these Examples at all. Examples 1 and 2 were carried out with reference to the method described in Blood. 111 (3): 1013-20 (2008).

[Example 1]
After removing the spleen from C57BL / 6 mice (10 weeks old, male, produced by CLEA Japan), in RPMI 1640 medium containing 400 units / mL type I collagenase (Sigma) and 10% FBS (Nichirei) Agitation was performed to obtain spleen cells. Thereafter, the spleen cells were suspended in MACS buffer [0.5% BSA (Sigma) and PBS containing 2 mM EDTA (pH 7.2)] containing CD4 microbeads (Miltenyi Biotech) for 15 minutes. Incubation was performed at 4 ° C. After spleen cells were washed with MACS buffer, CD4 positive cells were separated and collected with a MACS column (Milteny Biotech) and used as CD4 positive T cells in the test. 50 μL of 5 μg / mL anti-mouse CD3 antibody (manufactured by eBioscience) was dispensed into a 96-well microplate (manufactured by BD), incubated at 4 ° C. for 15 hours, washed twice with PBS, and the CD4 positive T cells described above It was used for culture. In order to induce Th17 cells from CD4 positive T cells, 5 μg / mL anti-mouse CD28 antibody (manufactured by eBioscience), 20 ng / mL IL-6 (manufactured by R & D Systems), 2 ng / mL TGF-β (manufactured by R & D Systems) ) And 10% FBS in RPMI1640 medium at 5 × 10 ⁵ cells / well (culture medium volume 250 μL).

  At the start of the culture, retinoic acid (positive control), fucoxanthin or various carotenoids other than fucoxanthin were added to the medium. Retinoic acid (manufactured by Sigma) has fucoxanthin (Cayman Chemical), astaxanthin (manufactured by Wako Pure Chemical Industries), lycopene (manufactured by Wako Pure Chemical Industries) and lutein (Wako Pure Chemical Industries) so that the final concentration is 1 μM. Were added to a final concentration of 2 μM or 4 μM, respectively. After 72 hours of culture, the supernatant was collected, and the concentration of IL-17 was measured using mouse IL-17 ELISA Kit (manufactured by eBioscience).

  The results are shown in FIG. As a control, the result of culturing in the same medium without addition of retinoic acid, fucoxanthin and various carotenoids (“Med”), 5 μg / mL anti-mouse CD28 antibody (manufactured by eBioscience), and containing 10% FBS The result ("Unt") of culturing in RPMI1640 medium (without adding IL-6 and RGF-β) without adding retinoic acid, fucoxanthin and various carotenoids is shown. It is known that retinoic acid induces Foxp3-positive regulatory T cells from naive T cells to suppress Th17 cell differentiation and suppress IL-17 production, but fucoxanthin and IL-17 are also known. It was shown to have a production inhibitory effect. Various carotenoids (astaxanthin, lycopene, lutein) other than fucoxanthin did not show IL-17 production inhibitory action.

[Example 2]
Spleen cells were obtained from mice using the same method as in Example 1. Thereafter, CD4 positive T cells were collected from the spleen cells by using Mouse CD4 ⁺ T Cell Isolation Kit II (manufactured by Miltenyi Biotech). Cells were labeled with FITC-labeled anti-mouse CD62L antibody (manufactured by eBioscience), incubated with FITC microbeads (manufactured by Miltenyi Biotech) for 15 minutes at 4 ° C., washed with MACS buffer, and then CD62L-positive cells with a MACS column. Was separated and recovered. As a result, CD4 positive and CD62L positive naive T cells were obtained. In order to induce Th17 cells from the obtained naive T cells, 5 μg / mL anti-mouse CD28 antibody (manufactured by eBioscience), 20 ng / mL IL-6 (manufactured by R & D Systems), 2 ng / mL TGF-β (R & D Systems) And 5% 10 ⁵ cells / well (culture volume 250 μL) in RPMI 1640 medium containing 10% FBS.

  At the start of the culture, retinoic acid (positive control), fucoxanthin or various carotenoids other than fucoxanthin were added to the medium. Retinoic acid (manufactured by Sigma) has fucoxanthin (manufactured by Cayman Chemical), fucoxanthinol (manufactured by Wako Pure Chemical Industries), astaxanthin (manufactured by Wako Pure Chemical Industries), lycopene ( Wako Pure Chemical Industries, Ltd.) and Lutein (Wako Pure Chemical Industries, Ltd.) were added so that the final concentration was 2 μM or 4 μM, respectively. After culturing for 72 hours, Phorbol 12-Myristate 13-acetate (PMA, manufactured by Sigma), Ionomycin (manufactured by Sigma) and GolgiStop (manufactured by BD) had final concentrations of 0.1 μg / mL and 0.25 μg / mL, respectively. And 2 μl / mL. After 4 hours, the cells were recovered and fixed with Foxp3 Staining Kit (manufactured by eBioscience), followed by FITC-labeled anti-mouse IL-17 antibody (manufactured by eBioscience) and PE-labeled anti-mouse Foxp3 antibody (manufactured by eBioscience). After staining, each expression was analyzed by a flow cytometer, the ratio of Foxp3-positive regulatory T cells and IL-17-producing Th17 cells was examined, and the ratio of Foxp3-positive regulatory T cells and IL-17-producing Th17 cells was calculated.

  The results are shown in FIG. In addition, the numerical value described in the vertical axis | shaft and horizontal axis | shaft of FIG. 2 shows fluorescence intensity. Although the fluorescence intensity varies somewhat from measurement to measurement, it can be used as a numerical value indicating the proportion of cell groups measured simultaneously. As a control, the result of culturing in the same medium without addition of retinoic acid, fucoxanthin and various carotenoids (control (medium addition)), 5 μg / mL anti-mouse CD28 antibody (manufactured by eBioscience), and containing 10% FBS The results ("untreated") of culture without adding retinoic acid, fucoxanthin and various carotenoids in RPMI1640 medium (without addition of IL-6 and RGF-β) are shown. Similar to retinoic acid, fucoxanthin and fucoxanthinol, which is a metabolite of fucoxanthinol, induces Foxp3-positive regulatory T cells from naive T cells and differentiates Th17 cells that produce IL-17. It was shown that there is an action to suppress. Although retinoic acid is derived from vitamin A in vivo, it is known that the in vivo concentration is kept constant due to homeostasis. That is, even if a large amount of vitamin A is ingested, the retinoic acid concentration in the living body does not change greatly, but fucoxanthin and its metabolite fucoxanthinol are less susceptible to in vivo metabolism after ingestion. It was thought that it had the advantage that an effect could be exhibited in the living body.

[Example 3]
Preparation of wakame extract and measurement of fucoxanthin content and fatty acid content in the extract were performed. 200 mL of 80% ethanol was added to 30 g of dried wakame (powder) and stirred for 30 minutes. Thereafter, the supernatant was collected by suction filtration, and the collected supernatant was concentrated by an evaporator and dissolved in 50 mL of 100% ethanol for use in analysis. The results of analysis values are shown in the table. The omega-3 polyunsaturated fatty acids, octadecatetraenoic acid, eicosapentaenoic acid and α-linolenic acid, and fucoxanthin (36.6 mg) were recovered.

  The IL-17 production inhibitor, Th17 cell differentiation inhibitor and IL-17 or Th17 cell-related disease or condition-preventing or treating composition of the present invention are industrially used in the fields of pharmaceuticals, foods, reagents and the like. Have potential. According to the present invention, the above-mentioned agent and composition can be easily provided at low cost.

Claims (9)

  An IL-17 production inhibitor containing fucoxanthin, fucoxanthinol or a derivative thereof.   A Th17 cell differentiation inhibitor containing fucoxanthin, fucoxanthinol or a derivative thereof.   A composition for prevention or treatment of a disease or condition associated with IL-17 or Th17 cells, comprising fucoxanthin, fucoxanthinol or a derivative thereof.   4. The composition of claim 3, wherein the disease or condition is an autoimmune disease or a non-infectious inflammatory disease.   5. The composition of claim 4, wherein the disease or condition is selected from the group consisting of rheumatoid arthritis, systemic lupus erythematosus, multiple sclerosis, psoriasis, Crohn's disease, ulcerative colitis and food allergy.   The agent or composition according to any one of claims 1 to 5, wherein fucoxanthin, fucoxanthinol or a derivative thereof is derived from seaweed.   The agent or composition according to claim 6, further comprising an omega-3 polyunsaturated fatty acid selected from octadecatetraenoic acid, eicosapentaenoic acid and α-linolenic acid.   The agent or composition according to any one of claims 1 to 7, which contains 1 mg to 100 mg of fucoxanthin, fucoxanthinol or a derivative thereof in terms of dry matter per gram.   The agent or composition according to any one of claims 1 to 7, which is a beverage and contains 5 mg to 2500 mg of fucoxanthin, fucoxanthinol or a derivative thereof in terms of dry matter per 500 mL.