WO2012121080A1 - メタボリックシンドローム改善剤 - Google Patents
メタボリックシンドローム改善剤 Download PDFInfo
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- WO2012121080A1 WO2012121080A1 PCT/JP2012/055088 JP2012055088W WO2012121080A1 WO 2012121080 A1 WO2012121080 A1 WO 2012121080A1 JP 2012055088 W JP2012055088 W JP 2012055088W WO 2012121080 A1 WO2012121080 A1 WO 2012121080A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
- A61K31/19—Carboxylic acids, e.g. valproic acid
- A61K31/20—Carboxylic acids, e.g. valproic acid having a carboxyl group bound to a chain of seven or more carbon atoms, e.g. stearic, palmitic, arachidic acids
- A61K31/201—Carboxylic acids, e.g. valproic acid having a carboxyl group bound to a chain of seven or more carbon atoms, e.g. stearic, palmitic, arachidic acids having one or two double bonds, e.g. oleic, linoleic acids
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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 COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- 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
- A23L33/115—Fatty acids or derivatives thereof; Fats or oils
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/21—Esters, e.g. nitroglycerine, selenocyanates
- A61K31/215—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids
- A61K31/22—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acyclic acids, e.g. pravastatin
- A61K31/23—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acyclic acids, e.g. pravastatin of acids having a carboxyl group bound to a chain of seven or more carbon atoms
- A61K31/231—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acyclic acids, e.g. pravastatin of acids having a carboxyl group bound to a chain of seven or more carbon atoms having one or two double bonds
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
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- A61P3/00—Drugs for disorders of the metabolism
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/04—Anorexiants; Antiobesity agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/06—Antihyperlipidemics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
- A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/12—Antihypertensives
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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
- A61K35/56—Materials from animals other than mammals
- A61K35/60—Fish, e.g. seahorses; Fish eggs
Definitions
- the present invention relates to an agent for improving metabolic syndrome. More specifically, the present invention relates to a metabolic syndrome improving agent comprising a food-derived highly safe ingredient as an active ingredient.
- Metabolic syndrome is considered to be caused by the accumulation of visceral fat as one of the causes.
- Several diagnostic criteria are currently published in Japan regarding metabolic syndrome.
- One criterion is strongly suspected to be metabolic syndrome if two or more of the following symptoms are true: A person with visceral fat obesity whose abdominal circumference is 85 cm or more for men and 90 cm or more for women, -Regarding blood pressure, systolic blood pressure is 130 mmHg or higher or diastolic blood pressure is 85 mmHg or higher, -Regarding blood glucose level, fasting blood glucose is 100mg / dL or more, and -Regarding lipids, neutral fat in blood is 150 mg / dL or more or HDL cholesterol is less than 40 mg / dL. Moreover, when it corresponds to one of said symptoms, it is defined as a metabolic syndrome reserve group.
- dietary restriction and exercise therapy have been the main methods for treatment and improvement of metabolic syndrome.
- a drug for treating and improving metabolic syndrome a drug for individually treating the above symptoms has been used.
- white adipose tissue, blood glucose level, blood insulin level, blood cholesterol, blood LDL-cholesterol and blood free fatty acid levels, such as diabetes, blood pressure lowering and hyperlipidemia have been used as drugs for the treatment and improvement of metabolic syndrome for metabolic syndrome.
- EPA eicosapentaenoic acid
- DHA docosahexaenoic acid
- Non-Patent Document 1 reports that n-3 PUFAs such as EPA and DHA up-regulate lipid metabolism and suppress weight gain.
- Non-Patent Document 2 reports that n-3 PUFAs such as EPA and DHA induce adiponectin expression in adipocytes and increase plasma adiponectin levels.
- the characteristic fatty acid composition in fish oil differs depending on the fish species.
- far-sea swimming fish such as saury, walleye pollock, caperin and herring are rich in long-chain monounsaturated fatty acids (monounsaturated fatty acid, MUFA) in addition to long-chain n-3 polyunsaturated fatty acids.
- MUFA monounsaturated fatty acid
- polyunsaturated fatty acids and long-chain monounsaturated fatty acids it is known that the effects of the physiological functions of these fatty acids generally vary depending on the number of carbons and the number and position of double bonds. For many fatty acids that differ in carbon number and number and position of double bonds, many fatty acids that have not yet been examined for physiological effects remain. Therefore, polyunsaturated fatty acids and long-chain monounsaturated fatty acids may have further physiological effects, and discovery of novel physiological effects is desired.
- an object of the present invention is to provide an improving agent for improving metabolic syndrome.
- the double bond in the fatty acid has different effects on the living body if the position and number thereof are different.
- the number of carbon atoms in a fatty acid differs in its effect on a living body when its length is different.
- the present inventors focused on the effects of MUFAs abundant in saury oil or walleye pollack oil on physiological effects, and as a result of repeated research, as a result of research, they have a monounsaturated fatty acid having 20 carbon atoms (hereinafter also referred to as C20: 1).
- the monounsaturated fatty acid having 22 carbon atoms hereinafter also referred to as C22: 1) have an improvement effect on the metabolic syndrome, and the present invention has been conceived.
- the present invention provides a metabolic syndrome improving agent comprising a C22 monounsaturated fatty acid and / or a C20 monounsaturated fatty acid or a salt or ester thereof as an active ingredient.
- the present invention also provides the above metabolic syndrome improving agent, wherein the ester of a monounsaturated fatty acid having 22 carbon atoms and / or an ester of a monounsaturated fatty acid having 20 carbon atoms is a glyceride.
- the present invention also provides the above metabolic syndrome improving agent, wherein the glyceride of a monounsaturated fatty acid having 22 carbon atoms and / or a monounsaturated fatty acid having 20 carbon atoms is fish oil.
- the proportion of the monounsaturated fatty acid having 22 carbon atoms and the monounsaturated fatty acid having 20 carbon atoms in the total fatty acid is 30% by weight or more, or 40% by weight or more, 50% by weight or more.
- the metabolic syndrome improving agent is provided.
- the present invention provides a food containing a monounsaturated fatty acid having 22 carbon atoms and / or a monounsaturated fatty acid having 20 carbon atoms, or a salt or ester thereof, which is labeled for use in improving metabolic syndrome. provide.
- the metabolic syndrome-improving agent of the present invention can treat and ameliorate many symptoms of metabolic syndrome.
- the metabolic syndrome improving agent of the present invention can reduce white adipose tissue, blood glucose level, blood insulin concentration, blood cholesterol, blood LDL-cholesterol and blood free fatty acid concentration.
- the metabolic syndrome-improving agent of the present invention can suppress the expression of fatty acid synthesis genes in adipose tissue.
- the metabolic syndrome-improving agent of the present invention can promote the expression of genes in the energy metabolism system.
- the pharmaceutical or food containing the monounsaturated fatty acid having 22 carbon atoms and / or the monounsaturated fatty acid having 20 carbon atoms of the present invention can be provided for prevention and improvement of metabolic syndrome.
- the figure which shows the effect with respect to the insulin sensitivity improvement of saury oil The figure which shows the effect with respect to plasma adipokine of saury oil.
- the metabolic syndrome-improving agent of the present invention is C22: 1 and / or C20: 1 or a salt or ester containing them as a constituent fatty acid, and includes oils derived from natural products such as marine oils and microbial oils containing them. .
- ⁇ C22: 1 and / or C20: 1 used in the metabolic syndrome-improving agent of the present invention can be any material or form as long as it is acceptable for pharmaceuticals and foods.
- fish oil such as saury can be used as it is or after purification.
- fats and oils derived from animals such as seals and whales can also be used.
- MUFA can be concentrated and used even if the raw material does not contain much MUFA.
- Saury crude oil is usually collected in the following manner, as with other fish oils.
- Processed residue such as fish head, skin, middle bone and internal organs generated from whole saury or fish processing is pulverized and steamed, then squeezed to separate into broth (stick water, SW) and compressed meal.
- broth stick water, SW
- the fats and oils obtained with the broth are separated from the broth by centrifugation.
- dococenoic acid (C22: 1) in saury (raw) fatty acids is 19.3% by weight
- icosenoic acid (C20: 1) is 17.2% by weight
- total amount of monounsaturated fatty acids Is stated to be 50.1% by weight.
- Saury oil is characterized by a high content of monounsaturated fatty acids among fish oils.
- crude oil of fish oil is made into refined fish oil through purification processes such as degumming, deoxidation, decolorization, and deodorization processes.
- This refined fish oil can also be used as a MUFA source.
- a method of concentrating using lipase reaction, or concentrating monounsaturated fatty acid ethyl ester after ethyl esterification, and then transesterifying with glycerin can be obtained by a method of reconstitution into triglyceride.
- the monounsaturated fatty acid used in the metabolic syndrome improving agent of the present invention can be a salt or ester thereof.
- the salt include potassium salt and sodium salt.
- the ester include esters of lower alcohols having 5 or less carbon atoms, esters with glycerol such as monoglyceride, diglyceride and triglyceride, and phospholipids.
- glycerin ester or ethyl ester is used.
- fish oil containing C22: 1 and / or C20: 1 glycerides can be used as the monounsaturated fatty acid used in the metabolic syndrome-improving agent of the present invention.
- C22: 1 and C20: 1 have different contents depending on the fish species, but as for the fish species with high content, fish belonging to the saury family such as saury, madara, walleye pollack, Atlantic cod, gindala etc. Examples include salmonid fish such as fish, chum salmon, coho salmon, sockeye salmon, caraft trout, cormorant salmon, rainbow trout, cucumber fish such as calaft shishamo, shishamo, and herringae such as herring.
- fish such as squid, tuna, mackerel and kingfisher are also relatively abundant. It is also abundant in the liver oil of sharks such as the black shark, the shark, and the shark. It is preferable to use fish oil purified from these fishes for the improving agent of the present invention.
- the metabolic syndrome refers to the metabolic syndrome in the broadest sense.
- symptoms from the following diagnostic criteria are included, but symptoms from any other diagnostic criteria are not excluded:
- a person with visceral fat obesity whose abdominal circumference is 85 cm or more for men and 90 cm or more for women, -Regarding blood pressure, systolic blood pressure is 130 mmHg or higher or diastolic blood pressure is 85 mmHg or higher, ⁇ Fasting blood sugar is 100mg / dL or more, and -Regarding lipids, neutral fat in blood is 150 mg / dL or more or HDL cholesterol is less than 40 mg / dL.
- it defines as a metabolic syndrome reserve group,
- the syndrome in a metabolic syndrome reserve group is also contained in a metabolic syndrome.
- Metabolic syndrome improvement refers to improvement of any of the symptoms diagnosed as a metabolic syndrome patient and a metabolic syndrome reserve group. Examples include reductions in white adipose tissue, blood glucose levels, blood insulin levels, blood cholesterol, blood LDL-cholesterol and blood free fatty acid levels. Metabolic syndrome can be improved by increasing blood adiponectin concentration, decreasing adipocytokine resistin and TNF ⁇ concentration, improving insulin resistance, and fatty acid synthesis system gene SCD-1 (Stearoyl CoA desaturase-1 ) Expression as well as a reduction in visceral fat mass.
- SCD-1 Stearoyl CoA desaturase-1
- the metabolic syndrome-improving agent of the present invention can be a composition containing optional components in addition to the above C22: 1 and C20: 1.
- the metabolic syndrome-improving agent of the present invention when used as a pharmaceutical, is provided as a composition together with a pharmaceutically acceptable base, carrier, excipient, disintegrant, lubricant and coloring agent. Can do. Since it is preferably a liquid oil, it is preferably provided as a tablet or capsule after being processed into a soft capsule such as gelatin or a powdered oil.
- the metabolic syndrome improving agent of the present invention can be provided as a food containing C22: 1, C20: 1 and / or fish oil in addition to the above.
- food means all foods including beverages, and includes general foods including health foods such as supplements, as well as foods for specified health use and nutritional function foods stipulated in the Health Function Food System of the Consumer Affairs Agency. Including.
- a functional food with a label indicating that it has an action to improve metabolic syndrome is provided.
- food containing fish oil can be provided as it is.
- coating to another foodstuff can be provided.
- it can also be provided as animal feed.
- a food containing C22: 1, C20: 1 and / or fish oil can be provided as a product packaged with instructions describing that the food has a metabolic syndrome improving action.
- the metabolic syndrome-improving agent of the present invention may contain C22: 1, C20: 1 and / or fish oil in an amount necessary to exert a metabolic syndrome-improving action.
- the metabolic syndrome-improving agent of the present invention when administered to a patient as a pharmaceutical or a food, is not limited depending on conditions such as the degree of symptoms, the patient's age, weight and health condition, but for adults, 1 mg to 1 g / kg / day, preferably 5 mg to 300 mg / kg / day of C22: 1, C20: 1 and / or fish oil, orally or parenterally, divided into once a day or 2-4 times or more, as appropriate Can be administered at intervals.
- the metabolic syndrome improving agent of the present invention does not have a strong effect and side effects unlike pharmaceutical products, there is no limit on the daily intake.
- MUFA concentrated saury oil was prepared as follows. Saury oil was ethyl esterified and applied to an ODS column, and the fraction of monounsaturated fatty acid ethyl ester was collected and concentrated. Subsequently, the enzyme lipase was used to transesterify with glycerin to reconstitute triglycerides. As a result of analysis, this saury MUFA oil has a lipid composition of 100% triglyceride, and the fatty acid composition is shown in Table 2.
- Spontaneously diabetic KKAy mice were obtained from CLEA Japan.
- C57BL / 6Jus was obtained from Nippon Charles River Co., Ltd.
- the insulin tolerance test was performed by intraperitoneal administration so that the aqueous insulin solution was 0.75 U / kg after fasting for 5 hours.
- orbital blood sampling was performed immediately before insulin administration (0 minute) and 20 minutes, 40 minutes, 60 minutes, and 80 minutes after administration, and blood glucose levels were measured with glucose CII-Test Wako.
- Total blood cholesterol level, blood HDL cholesterol level and blood triglyceride level are cholesterol E-Test Wako (Wako Pure Chemical), HDL cholesterol-Test Wako (Wako Pure Chemical), and triglyceride E-Test Wako (Wako Pure), respectively. Drug).
- the blood insulin concentration was measured using a Morinaga insulin measurement kit (Morinaga Bioscience Laboratory Co., Ltd.).
- mRNA For the measurement of mRNA, expression levels of genes involved in lipid metabolism were evaluated by performing real-time PCR reaction using cDNA synthesized using total RNA extracted from mesenteric white adipose tissue. The 18s ribosomal RNA gene was used as an endogenous control gene. The relative expression level of each gene in the saury oil administration group was calculated with the expression level of the gene in the control group being 1.
- the primers for each gene are as follows.
- Table 5 shows the effect of saury oil on body weight, mesenteric WAT mass, and plasma markers of glucose and lipid metabolism in both studies.
- FIG. 1 is a graph showing the effect of saury oil on insulin resistance in KKAy mice. Insulin resistance test was performed in KKAy mice fed with a diet containing 10% soybean oil (control group) or a diet containing 10% saury oil for 3 weeks. The values in the figure are standardized with respect to the control group. Moreover, the value in a figure shows average +/- SE. * Indicates a significant difference from the control group with P ⁇ 0.05.
- FIG. 2 is a graph showing the effect of saury oil on the plasma concentration of protein, which is an indicator of metabolic syndrome.
- FIG. 2A shows plasma adiponectin concentrations in spontaneously diabetic KKAy mice (left) and diet-induced obese C57BL / 6J mice (right).
- FIG. 2B shows plasma resistin concentrations in KKAy mice (left) and diet-induced obese C57BL / 6J mice (right).
- FIG. 2C shows plasma TNF- ⁇ concentration in KKAy mice.
- FIG. 2D shows plasma leptin levels in diet-induced obese C57BL / 6Jus.
- the blood adiponectin concentration significantly increased in KKAy mice fed with saury oil.
- the concentrations of resistin and TNF ⁇ which are bad adipocytokines, were significantly reduced in KKAy mice fed saury oil (FIGS. 2B and 2C). It was considered that the diet containing saury oil led to favorable fluctuations in blood adipokines, improvement in blood glycolipid metabolic factors, and improvement in insulin resistance.
- C57BL / 6J mice fed with 10% saury oil had a significant increase in blood adiponectin concentration.
- the concentration of resistin which is a bad adipocytokine, was significantly reduced in C57BL / 6J mice fed a diet containing 10% saury oil.
- the blood leptin concentration was significantly decreased in C57BL / 6J mice fed with a diet containing 10% saury oil. It was suggested that diet containing saury oil improved leptin resistance due to obesity. Moreover, it was thought that it led to the favorable fluctuation
- FIG. 4 shows the effect of saury oil on mRNA expression of genes related to lipid metabolism in mesenteric WAT.
- Figure 4A shows fatty acid synthesis genes SREBP-1 (Stegioatorregulatory element binding protein 1), SCD-1 (Stearoyl CoA desaturase-1), FAS (Fatty acid synthase), ACC (Acetyl-CoA carboxylase) It is a figure which shows ACC expression.
- FIG.4B shows the fatty acid ⁇ -oxidation system, the rate-limiting enzyme CPT-1 (Carnitine palmitoyltransferase-1) gene and the energy metabolism gene PGC-1 ⁇ (Peroxisome proliferator-activated receptor gamma coactivator 1-alpha), PGC-1 ⁇ (Peroxisome proliferator
- Test 3 Effect of saury oil on metabolic syndrome in spontaneously diabetic KKAy mice .
- KKAy mice were fed a diet containing 10% soybean oil (control group) or a diet containing 10% saury oil for 6 weeks.
- SCD-1 mRNA expression in mesenteric WAT was measured by real-time PCR.
- FIG. 3 shows the effect of saury oil on SCD-1 mRNA expression in mesenteric WAT in KKAy mice.
- Test 4 Effect of MUFA concentrated saury oil on metabolic syndrome in diet-induced obese C57BL / 6J mice . Taking into account the results of the above comparative examples, saury oil enriched with these fatty acids was used to examine whether the effects of saury oil are based on saury oil C22: 1 and C20: 1. Then, the effect on metabolic syndrome was examined.
- FIG. 5 shows the effect of MUFA concentrated saury oil on insulin resistance in C57BL / 6J mice.
- An insulin resistance test was performed in C57BL / 6J mice fed with a diet containing 33% lard (control group) or a diet containing 5% MUFA concentrated saury oil for 3 weeks.
- the values in the figure represent mean ⁇ SE. ** and *** indicate a significant difference from the control group. (**: P ⁇ 0.01, ***: P ⁇ 0.001).
- FIG. 6 is a graph showing the effect of MUFA concentrated saury oil on the plasma concentration of protein, which is an indicator of metabolic syndrome.
- C57BL / 6J mice were fed for 6 weeks, whole blood was collected from the mice, blood biochemical tests were performed using plasma obtained by centrifugation, and plasma adipokine levels were measured using ELISA.
- FIG. 6A shows plasma adiponectin concentrations in diet-induced obese C57BL / 6J mice.
- the blood adiponectin concentration significantly increased in C57BL / 6J mice fed with MUFA concentrated saury oil.
- the resistin concentration which is a bad adipocytokine, was significantly reduced in C57BL / 6J mice fed with MUFA concentrated saury oil (FIG. 6B).
- the diet containing MUFA concentrated saury oil was thought to have led to favorable fluctuations in blood adipokines and improvements in blood glycolipid metabolic factors.
- Example 11 A test similar to Example 1 performed using saury oil was performed using walleye pollack refined oil (deacidification, decolorization).
- Walleye pollack oil having the fatty acid composition shown in Table 10 was mixed with the diet and fed to diet-induced obese C57BL / 6J mice.
- the blood lipid (cholesterol and triglyceride) concentrations in: 17%; salmon pollock oil: 15%) were significantly reduced (Table 11).
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Abstract
Description
腹囲が男性85cm以上、女性90cm以上の内臓脂肪型肥満の人であって、
・血圧に関して、収縮期血圧が130mmHg以上または拡張期血圧が85mmHg以上、
・血糖値に関して、空腹時血糖が100mg/dL以上、および、
・脂質に関して、血中の中性脂肪が150mg/dL以上またはHDLコレステロールが40mg/dL未満。また、上記の症状の1つに該当する場合は、メタボリックシンドローム予備群と定義される。
腹囲が男性85cm以上、女性90cm以上の内臓脂肪型肥満の人であって、
・血圧に関して、収縮期血圧が130mmHg以上または拡張期血圧が85mmHg以上、
・空腹時血糖が100mg/dL以上および、
・脂質に関して、血中の中性脂肪が150mg/dL以上またはHDLコレステロールが40mg/dL未満。また、上記の症状の1つに該当する場合は、メタボリックシンドローム予備群と定義されるが、メタボリックシンドロームには、メタボリックシンドローム予備群における症状も含まれる。
C22:1およびC20:1を含むサンマ油としては、サンマ原油をシリカゲルおよび活性白土によって脱色し、さらに水蒸気蒸留によって脱臭した精製サンマ油を使用した。大豆油は、オリエンタル酵母(株)から、ラードはカメリア(株)から入手した。それぞれの油脂の脂肪酸組成を表1に示した。
インスリン負荷試験は、5時間絶食した後に、インスリン水溶液が0.75U/kgとなるように腹腔内投与して行った。また、インスリン投与直前(0分)、並びに投与20分、40分、60分および80分後に眼窩採血を実施し、グルコースCII-テストワコーにより血糖値を測定した。
血中アディポネクチン、レジスチン、TNF-αおよびレプチン濃度は、それぞれMouse adiponectin ELISA kit(大塚製薬)、Mouse Resistin ELISA kit(シバヤギ)、Mouse TNF-α ELISA kit(シバヤギ)、および Mouse Leptin ELISA kit(モリナガ生化学研究所)によって測定した。
血中総コレステロール濃度、血中HDLコレステロール濃度および血中トリグリセリド濃度は、それぞれコレステロールE-テストワコー(和光純薬)、HDLコレステロール-テストワコー(和光純薬)、およびトリグリセライドE-テストワコー(和光純薬)を使用して測定した。血中インスリン濃度は、モリナガインスリン測定キット(株式会社森永生科学研究所)を使用して測定した。
mRNAの測定は、腸管膜白色脂肪組織から抽出した全RNAを用いて合成したcDNAを用いて、リアルタイムPCR反応を行うことにより、脂質代謝に関与する遺伝子の発現量を評価した。内在性の対照遺伝子として18sリボソームRNA遺伝子を用いた。対照区における遺伝子の発現量を1として、サンマ油投与群における各遺伝子の相対発現量を算出した。なお、各遺伝子におけるプライマーは以下の通りである。
自然発症糖尿病KKAyマウス(n=10)に、表4に示した大豆油10%配合した飼料(対照区)またはサンマ油10%配合した飼料を4週間ペアフィーディングした。4週間平均摂餌量は4.44g/日であった。混餌飼育終了後、サンマ油投与群を対照区群と比較した。
食事誘導性肥満マウスC57BL/6Jに、表4に示したラードを32%配合した高脂肪飼料(対照区)、またはラードを22%+サンマ油を10%配合した高脂肪飼料を使用して、C57BL/6Jマウスを6週間混餌飼育した。6週間平均摂餌量は、対照区では2.49g/日、サンマ油区では2.68g/日であった。混餌飼育終了後、サンマ油投与群を対照区と比較した。
表5に両試験のマウスの体重、腸間膜WAT質量、並びにグルコースおよび脂質代謝の血漿マーカーに対するサンマ油の効果を示す。
また、C57BL/6Jマウスにおいても、サンマ油を10%配合した飼料を与えたC57BL/6Jマウスは、血糖値、血中インスリン濃度、血中コレステロール、血中LDL-コレステロールおよび血中トリグリセリド濃度が有意に低下した。また、表中の値は、平均±SEを示す。*、**および***は、それぞれP<0.05、P<0.01およびP<0.001の対照群からの有意差を示す。
KKAyマウスに、大豆油を10%配合した飼料(対照区)またはサンマ油を10%配合した飼料を6週間与えた。処置期間後、腸間膜WATにおけるSCD-1 mRNA発現をリアルタイムPCRによって測定した。図3は、KKAyマウスにおけるサンマ油の腸間膜WATにおけるSCD-1 mRNA発現に対する効果を示す図である。mRNAは、18SリボソームRNAのものに対して標準化して、対照に対して表した。値は、平均±SE(n=10)を示す。*は、p<0.05の対照群からの有意差を示す。図3に示したとおり、サンマ油を与えたKKAyマウスは、脂肪組織での脂肪酸合成系の遺伝子SCD-1(Stearoyl CoA desaturase-1)の発現が抑制された。サンマ油の長期投与が、内臓脂肪量の低下およびインスリン抵抗性改善につながったものと考えられた。
上記の実験は、メタボリックシンドローム改善に対するサンマ油の効果を検討した。一方、サンマ油にも一定量のEPA/DHAが含有されている。以下の表6および表7は、これらのEPA/DHAを使用した実験の結果を今回のサンマ油を使用した実験の結果と比較したものである。
上記の比較例の結果を考慮し、サンマ油の効果は、サンマ油のC22:1およびC20:1に基づくものであるか否かを検討するために、これらの脂肪酸を濃縮したサンマ油を使用して、メタボリックシンドロームに対する効果を検討した。
表9に、試験4におけるマウスの体重、腸間膜WAT質量、並びにグルコースおよび脂質代謝の血漿マーカーに対するMUFA濃縮サンマ油の効果を示す。それぞれの値は、平均±SE (n=10)を示す。各欄の上付きの文字は、対照群に対する有意差を示す。(*: P<0.05、**:P<0.01、***: P<0.001)。
Claims (5)
- 炭素数22のモノ不飽和脂肪酸および/または炭素数20のモノ不飽和脂肪酸またはそれらの塩もしくはエステルを有効成分とする、メタボリックシンドローム改善剤。
- 炭素数22のモノ不飽和脂肪酸および/または炭素数20のモノ不飽和脂肪酸のエステルがグリセリドである、請求項1に記載のメタボリックシンドローム改善剤。
- 炭素数22のモノ不飽和脂肪酸および/または炭素数20のモノ不飽和脂肪酸のグリセリドが魚油である請求項2に記載のメタボリックシンドローム改善剤。
- 脂肪酸全体に占める、炭素数22のモノ不飽和脂肪酸および炭素数20のモノ不飽和脂肪酸の割合が30重量%以上である請求項1ないし3いずれか1項に記載のメタボリックシンドローム改善剤。
- 炭素数22のモノ不飽和脂肪酸および/または炭素数20のモノ不飽和脂肪酸またはそれらの塩もしくはエステルを含有し、メタボリックシンドローム改善のために用いる旨の表示を付した食品。
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WO2018216715A1 (ja) | 2017-05-23 | 2018-11-29 | 日本水産株式会社 | 血管内皮機能の改善用組成物 |
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JP2020073638A (ja) * | 2014-04-07 | 2020-05-14 | イーパクス ノルウェー アーエス | 長鎖一価不飽和脂肪酸組成物、及びその製造方法 |
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WO2016002868A1 (ja) * | 2014-07-02 | 2016-01-07 | 日本水産株式会社 | 水産物由来遊離1価不飽和脂肪酸又はその低級アルコールエステルの製造方法 |
US20170107453A1 (en) * | 2014-07-02 | 2017-04-20 | Nippon Suisan Kaisha, Ltd. | Production method of marine product-derived free monounsaturated fatty acids or lower alcohol esters thereof |
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