SG192109A1 - Gastrin production inhibitor and food composition comprising same - Google Patents

Gastrin production inhibitor and food composition comprising same Download PDF

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Publication number
SG192109A1
SG192109A1 SG2013056262A SG2013056262A SG192109A1 SG 192109 A1 SG192109 A1 SG 192109A1 SG 2013056262 A SG2013056262 A SG 2013056262A SG 2013056262 A SG2013056262 A SG 2013056262A SG 192109 A1 SG192109 A1 SG 192109A1
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Singapore
Prior art keywords
lactobacillus
food
bacteria
gastrin
production inhibitor
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SG2013056262A
Inventor
Yasuhiro Koga
Yukio Asami
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Meiji Co Ltd
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Publication of SG192109A1 publication Critical patent/SG192109A1/en

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    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23CDAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C9/00Milk preparations; Milk powder or milk powder preparations
    • A23C9/12Fermented milk preparations; Treatment using microorganisms or enzymes
    • A23C9/123Fermented milk preparations; Treatment using microorganisms or enzymes using only microorganisms of the genus lactobacteriaceae; Yoghurt
    • A23C9/1234Fermented milk preparations; Treatment using microorganisms or enzymes using only microorganisms of the genus lactobacteriaceae; Yoghurt characterised by using a Lactobacillus sp. other than Lactobacillus Bulgaricus, including Bificlobacterium sp.
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L29/00Foods or foodstuffs containing additives; Preparation or treatment thereof
    • A23L29/065Microorganisms
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L33/00Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/135Bacteria or derivatives thereof, e.g. probiotics
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00Drugs for disorders of the alimentary tract or the digestive system
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/04Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23VINDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2400/00Lactic or propionic acid bacteria
    • A23V2400/11Lactobacillus
    • A23V2400/145Gasseri

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Polymers & Plastics (AREA)
  • Food Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Medicinal Chemistry (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Nutrition Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Mycology (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Dairy Products (AREA)

Abstract

The purpose of the present invention is to provide a novel drug or food which can prevent or ameliorate a series of symptoms caused by gastric hyperacidity such as sour stomach and stomachache, reflux esophagitis, esophageal cancer and so on without resorting to the anti-Helicobacter pylori effect of a lactic acid bacterium.The present invention relates to a gastrin production inhibitor, which comprises dead cells of a bacterium belonging to the genus Lactobacillus, and a food composition comprising the same. In particular, the present invention relates to a gastrin production inhibitor wherein said bacterium belonging to the genus Lactobacillus is Lactobacillus gasseri (more particularly Lactobacillus gasseri OLL2716).

Description

Specification [Title of Invention]
Gastrin production inhibitor and food composition comprising same [Technical Field]
[0001]
Thepresent inventionrelatestolacticacidbacteriumhaving effects to improve gastritis, gastric ulcer, gastric hyperacidity and reflux esophagitis, and to pharmaceutical compositions and food compositions comprising said lactic acid bacterium. [Background Art] [00g27]
The intestinal tract contains diverse microbial flora consistingofvariousdifferent bacterial speciesincludinghighly dense live bacteria, and their concentration reaches 1otio1pte cells/gof the luminal contents. Rolesofinherentmicrobial flora in health and dizease are well known, which include metabolic activity, nutritional effects on the intestinal epithelia and immune system, and protection of the host te which they have colonized frow intrusion of foreign microorganisms {Non-patent
Literature 1).
[0003]
Meanwhile, when a human subject 1s not infected with
Helicobacter pylori, only several species of bacteria are present in the subject’s stomach. During fasting, the gastric juice contains only a small number of bacteria including Streptococcus,
Lactobacillus, and Veillonella at approximately 107-107/ml.
However, these bacteria are considered Lo be transient residents derived from the mouth and threat, and not indigenous {Non-patent
Literatures Zand 2}. It isconsideredthat sucha lack of bacteria in the human stomach is due to high intraluminal acidity.
[0004]
H. pylori iz well known as a pathogenic bacterium causing peptic ulcer and cancer in the human stomach. It has been previously proposed that Helicobacter bacteria alse belong te the indigenous microflora in the human stomach (Non-patent Literature 4), This hypothesis is supported by the fact that H. pylori is acquired in the early childhood, and considerable number of H. pylori has continued to colonize in the stomach for many decades.
From this, a need to clarify the role of indigenous microflora of the stomach in the physiological development and function of the stomach 1s brought about. However, it isdifficult toclarify the role of H. pylori by its infection test, because various virulence factors of H. pvlori including Cagh, vacuolating toxin, urease and 1ts metabolites, Induce chronic pathological inflammation in the gastric tissue, which makes the physicliogical role of H. pylori as a native bacterium unclear.
[0005]
In a previous study, the inventors of the present invention have found Indigenous microflora consisting predominantly of
Lactobacillus bacteria in the stomach of specific pathogen-free (SPF) mice {(Non-patent Literature 5b). We considered that because acidity in the stomach of the SPF mice is low, the Lactobacillus bacteria can colonize in the stomach. In addition, changes in the inflammation with unknown causes occurred in the stomach of the SPF mice.
[0006]
Thus, a number of research groups including the inventors of the present invention have focused on the relationship between the stomach and lacticacidbacteria suchas Lactobacillus bacteria and H. pylori {Helicobacter pylori), and promoted thelr studies.
Inparticular, many investigations have beenmade tothe prevention and improvement of gastritis and gastric ulcer using lactic acid bacteria (Patent Literatures 1-2}. However, most of themutilize anti-Helicobacter pylori action of lactic acid bacteria, and to date no sufficient investigation has been made Lo the prevention and improvement of upper gastrointestinal diseases that do not utilize such an action. [Citation List]
Patent Literature
[0007]
Patent Literature 1: JP B 4509250
Patent Literature 2: JP B 3046303
Patent Literature 3: JP B 2672247
Patent Literature 4: JP B 3810403
Patent Literature 5: JP B 4021951
Non-patent Literature
[0008]
Non-patent Literature 1: Guarner F., Malagelada JR. “Gut flora in health and disease.” Lancet 2003; 361: 512-519.
Non-patent Literature 2: Lambert J, and Hull R. “Upper gastrointestinal tract disease and probiotics” Asia Pacific JClin
Nutr 1996; 5: 31-35.
Non-patent Literature 3: Ruddell WS, Axon AT, Findlay JM,
Bartholomew BA, and Hill MJ. “Effect of cimetidine on the gastric bacterial flora.” Lancet. 1980; Mar 29: 672-674.
Non-patent Literature 4: Blaser MJ. “Helicobacters are indigenous to the human stomach: duodenal ulceration is due to changes in gastric microecology in the modern era.” Gut 1998; 43: 721-727.
Non-patent Literature 5: Kabir AMA, Aiba Y, Takagi A, Kamiya S,
Miwa T, and Koga Y. “Prevention of Helicobacter pylori infection by Lactobacilli inagnotobioticmurinemodel.” Gut 1997; 41: 49-55. [Summary of Invention]
Problems to Be Solved by the Invention
[0009]
The inventors of the present invention have found that, by giving live cells or dead cells of Lactobacillus bacteria to sterilized mice, the number of gastrin-producing cells in the stomach significantly decreases; as a result of further intensive studies, the inventors have accomplished the present invention.
Means for Solving the Problems
[0010]
Namely, the present invention relates to the following gastrinproductioninhibitor and food compositioncomprising same.
[1] A gastrin production inhibitor comprising dead cells of
Lactobacillus bacteria.
[2] A gastrin production inhibitor comprising dead cells, but no live cells, of Lactobacillus bacteria.
[3] The gastrin production inhibitor according to [1] or [2], wherein the Lactobacillus bacterium is Lactobacillus gasseri.
[4] The gastrin production inhibitor according to [1] or [2], wherein the Lactobacillus bacterium is Lactobacillus gasseri
OLL2716 (accession number: FERM BP-6999).
[5] A food composition comprising the gastrin production inhibitor according to any one of [1] to [4].
[6] The food composition according to [5], which is a fermented food using lactic acid bacteria.
[7] The food composition according to [6], wherein the fermented food using lactic acid bacteria is fermented milk.
[8] The food composition according to [7], wherein the fermented milk is yogurt.
Advantageous Effects of Invention
[0011]
In the inhibition of gastrin production in the present invention, because dead cells of Lactobacillus bacteria are used, no eradication action against H. pylori is involved (for example, refer to Patent Literatures 1 and 2), but gastric acid secretion can be suppressed by a direct action on the cells that make up the gastric tissue. Moreover, effects on the followings can also be expected: for example, gastric hyperacidity after eradication of H. pylori, reflux esophagitis caused by gastric hyperacidity, as well as gastritis, gastric ulcer, and reflux esophagitis which are not related to H. pylori, such as reflux esophagitis caused by aging.
According to the present invention, in particular, novel drugs and food products can be provided, which can prevent or ameliorate a series of symptoms caused by gastric hyperacidity, such as sour stomach and stomachache, reflux esophagitis, esophageal cancer and so on, without resorting to the anti-Helicobacter pylori effect of lactic acid bacteria.
[0012]
Furthermore, for example, for those who taking a non-steroidal anti-inflammatory drug (NSAID), gastritis and reflux esophagitis caused by gastric acid have been a problem, and at present, treatment to suppress gastric acid secretion by a proton pump inhibitor (PPI) has been adopted. However, the administration period of PPT is limited to a maximum of & weeks, and there ig a side effect of abnormal increases in the expresaion of gastrin {az hormone to promote gastric acid section}, because
FPI acts on the proton pump. In contrast, the gastrin production inhibitor of the present invention suppresses gastrin secretion by directly acing on the cells that make up the gastric tissue, and therefore, it is expected that the amount of PPI used may be decreased, and the side effect such as gastrin increase after completion of PPT administration may be suppressed, andgastritis, gastric ulcer, reflux esophagitis and hyperchliorphvdria caused by gazstrichyperacidity canbe effectively improved by concomitant use of the gastrin production inhibitor of the present invention with PRI.
[0013]
Inaddition, becausedeadcells are used, temperature control during transportation, ete. 1g not reguired, handling is simple, and there iz no possibility of quality degradation. Furthermore, it is not necessary to consider a symblotic relationship with other microorganisms (particularly bacteria), sc that limitation in the usage 1s fairly small.
Furthermore, in the food composition comprising the gastrin production inhibitor of the present invention, dead cells of
Lactobacillus bacteria are positively contained, so that it’s composition completely differs from that of conventional food compositions; inhibition of gastricacidsecretion canbe achieved by inhibiting gastrin.
[0014]
The gastrin production inhibitor of the present invention comprises dead cells of Lactobacillus bacteria. The gastrin production inhibitor of the present invention can also be used as a pharmaceutical agent or a food additive. In addition, it iz also possible that the gastrin production inhibitor of the present invention comprises dead cells, tut not live cells of
Lactobacillus bacteria. Moreover, it may consist only of dead cells.
[0015]
Examples of species belonging to the genus Lactobacilius inciude Lactobacillus delbrueckii subsp. Burgalicus,
Lactobacillus delbrueckii subsp. lactis, Lactobacillus paracasei subsp. paracasei, Lactobacillus helveticus, Lactobacillus helveticus subsp. jugurti, Lactobacillus acidophilus,
Lactobacillus crispatus, Lactobacillus amylovorus, Lactobacillus gallinarum, Lactobacillus gasseri, Lactobacillus oris,
Lactobacillus casei subsp. rhamnosus, Lactobacillus johnsonii,
Lactobacillus fermentum, and Lactobacillus brevis. The
Lactobacillus bacteria of the present invention are not particularly limited as long as their dead cells inhibit gastrin production, and a combination of one or more of the above species may be used. It is preferably Lactobacilius gasseri, and particularly preferably, Lactebacillus gasseri OLLZ2716 {accession number: FEEM BP-6929) (this bacterial strain has been deposited at the National Institute of Advanced Industrial Science and Technology, Patent Microorganisms Depositary (formerly
Ministry of International Trade and Industry, Agency of Industrial
Science and Technology, National Institute of Bicscience and
Human-Technology), address: Chuo 6, i-chome 1-1, Higashi,
Tsukuba-city, Tharaki, 305-3566, Japan {oid address: 1-Chome 1-3,
Higashi, Tsukuba-city, Ibaraki, 305-8566, Japan} on May 24 12929}.
[0016]
When the gastrin production inhibitor of the present invention 1s used as a medicine, its administration is not particularly limited as long as dead cells of Lactobacillus bacteria as an active ingredient eventually act on the stomach.
It inhibits gastrin production in an individual to which it is administered, and exhibits improvement effects on gastric hyperacidity, gastritis, gastric ulcer and reflux esophagitis, etc.
Administration of the gastrin production inhibitor of the present invention includes oral or parenteral administration.
For example, oral administration or tube administration may be used. From the viewpoint of ease and safety, oral administration is preferable. In addition, dosage form is not particularly limited, and may be selected as appropriate according to the administrationroute; examples include solution, capsule, granule, pill, suspension, emulsion, powder, tablet, syrup, injection, lozenge, etc.
[0017]
With regard to the oral administration preparation, various known types of dosage formmay be used, andexamples include granule, powder, tablet, pill, capsule, solution, syrup, emulsion, suspension, lozenge, etc.
As an example of parenteral administration, administration in the formof an injectionmay be cited. Furthermore, the gastrin production inhibitor of the present invention may be administered locally to a region to be treated. For example, it may be administered by local infusion during operation or using a catheter.
[0018]
Withregardtoacarrier that canbeused inthepharmaceutical composition of the present invention, a surfactant, an excipient, a colorant, a fragrance, a preservative, a stabilizer, a buffer, a suspension, an isotonizing agent, a binder, a disintegrant, a lubricant, a flowability promoter, a taste-masking agent, etc. can be cited as pharmaceutically acceptable carriers, and other commonly used carriers may be used as appropriate. Specific examples include light anhydrous silicic acid, lactose, crystalline cellulose, mannitol, starch, carmellose calcium, carmellose sodium, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polyvinylacetal diethylamino acetate, polyvinylpyrrolidone, gelatin, medium chain fatty acid triglyceride, polyoxyethylene hardened castor oil 60, sucrose, carboxymethylcellulose, corn starch, inorganic salts, etc.
[0019]
When the gastric production inhibitor of the present invention is used in a medicine, the concentration of contained dead cells of Lactobacillus bacteria is not particularly limited; when used as a concentrated liquid, the concentration is preferably 2 x 10° dead cells/g or more, and when used as a dried matter, it is preferably 2 x 10! dead cells/g or more.
When the gastric production inhibitor of the present invention is used as a medicine, the amount of blending of dead cells of Lactobacillus bacteria is not particularly limited, and can be appropriately adjusted depending on the dosage form, symptoms, body weight and application, etc.
The amount of intake of the medicine of the present invention is not particularly limited, and can be appropriately adjusted depending on the dosage form, symptoms, body weight and application, etc. Typically, an amount of 0.1-10000 mg/kg body weight can be taken, preferably 1-2000 mg/kg body weight, more preferably 10-500 mg/kg body weight can be taken. In addition, the manner of intake is not particularly limited; it is possible to take, for example, from one preparation of approximately 1 g per day, to three preparations (each being 10 g) per day. As an example of daily intake, for example, an individual with 60-kg body weight may take 6-g-stick of a powder preparation having 1-5 x 10" cells/g for
1-3 times per day, achieving a daily intake of 100-300 mg/kg.
[0020]
The food composition of the present invention comprises the gastrin production inhibitor claimed in the present invention.
The food composition of the present invention is not particularly limited. For example, it may be a food product that originally does or does not comprise lactic acid bacteria.
Moreover, it may be a fluid food (a liquid food product having flowability which can be swallowed by a subject without chewing).
Sincethegastrinproductioninhibitorclaimedinthepresent invention comprises dead cells of Lactobacillus bacteria, the food composition of the present invention comprises dead cells of one or more kinds of bacteria selected from the genus Lactobacillus.
Such a food composition inhibits the production of gastrin in individuals who have taken it, and exhibits improvement effects for gastric hyperacidity, gastritis, gastric ulcer and reflux esophagitis.
The food composition of the present invention may further comprise a carbohydrate, a protein, a lipid, a vitamin, a biologically essential trace metal (manganese sulfate, zinc sulfate, magnesium chloride, potassium carbonate, etc.), a fragrance, or other compounds.
[0021]
Examples of the carbohydrate include a saccharide, amodified starch (dextrin, soluble starch, British starch, oxidized starch, a starch ester, a starch ether, etc.), and dietary fiber.
Examples of the protein include whole milk powder, non-fat dried milk, partly skimmed milk powder, casein, whey powder, whey protein, wheyproteinconcentrate, wheyproteinisolate, a—casein,
R-casein, x—casein, R-lactoglobulin, a-lactoalbumin, lactoferrin,
animal and plant proteins such as soybean protein, egg protein, and meat protein, hydrolysates thereof; and various types of milk-derived components such as butter, whey mineral, cream, whey, non-protein nitrogen, sialic acid, phospholipid, and lactose.
[0022]
Examples of the lipid include animal oils and fats such as lard and fish oil, and fractionated oil, hydrogenated oil, and ester exchanged oil therefrom; and plant oils and fats such as palm oil, safflower oil, corn oil, rapeseed oil, and coconut oil, and fractionated oil, hydrogenated oil, and ester exchanged oil therefrom.
Examples of the vitamin include vitamin A, a carotene, the vitamin B group, vitamin C, the vitamin D group, vitamin E, the vitamin K group, vitamin P, vitamin Q, niacin, nicotinic acid, pantothenic acid, biotin, inositol, choline, and folic acid, and examples of the mineral include calcium, potassium, magnesium, sodium, copper, iron, manganese, zinc, and selenium.
[0023]
The category or type of the food composition of the present invention is not limited, and it may be functional food, food for specified health use, food for specialized applications, foodwith nutrient function claims, health food, or nursing care food and, furthermore, confectionery, a lactic fermenting beverage, a dairy product such as cheese and yogurt, seasoning, etc. The food and drink form is not limited either; it may be in any food and drink form that can normally be distributed such as solid, liquid, fluid food, jelly, tablet, granule, or capsule form, and may be added to various types of food (cow's milk, soft drink, fermented milk, yogurt, cheese, bread, biscuit, cracker, pizza crust, powdered formula, liquid food, medical food, nutritive food, frozen food,
processed food, other commercial food, etc.). These foods and drinks may be manufactured by standard methods of a person skilled in the art.
[0024]
Dead cells of Lactobacillus bacteria claimed in the present invention can be used by addition to the food fermented by lactic acid bacteria. Examples of the food fermented by lactic acid bacteria include fermented milk, kimuchi, and pickles. Fermented milk is particularly preferable, and among them, yogurt is preferable. In the food fermented by lactic acid bacteria, the live Lactobacillus bacteria grow exponentially, drawing a growth curve, and the number of live bacteria in the fermented food is naturally determined by a preferable degree of fermentation; in the food composition claimed in the present invention, dead cells are added in addition to live bacteria, and therefore the food comprigseaatotal amount (live +deadbacteria) exceeding the number of bacteria contained in a conventional fermented food by lactic acid bacteria, so that effective inhibition of gastrin production in the stomach is possible. For example, in the case of vogurt, the amount of Lactobacillus bacteria contained in a final product is estimated to be approximately 1 x 10'° per 100 g; in order to effectively inhibit gastrin production, dead cells with an approximate amount from 1 x 10 to 5 x 10'°, preferably from 1 x 10° to 5 x 10%, particularly preferably from 5 x 10° to 5 x 10"! are added, to achieve the total amount of bacteria {live + dead bacteria) contained to be from 1 x 10° to 5 x 10°, preferably from 1 x 10 to 5 x 10%, particularly preferably 1 x 10%.
[0025]
The concentration of dead cells of Lactobacillus bacteria contained in the food composition of the present invention is not particularly limited; when used as a concentrated liquid, the concentration is preferably 2 x 10'%/g or more, and when used as a dried matter, the concentration is preferably 2 x 10'"/g or more.
In the food composition of the present invention, the amount of blending of dead cells of Lactobacillus bacteria is not particularly limited, and can be appropriately adjusted depending on the dosage form, symptoms, body weight and application, etc.
The amount of daily intake of the food composition of the present invention 1s not particularly limited, and can be appropriately adjusted depending on the dosage form, symptoms, body weight and application, etc. Typically, an amount of 0.1-30000 mg/kg body weight can be taken, preferably 0.1-20000 mg/kg body weight, more preferably 0.1-4000 mg/kg body weight can be taken.
[0026]
Hereinafter, the present invention is further described based on Examples; however, such examples intend to exemplify the present invention, but not limit the present invention. [Examples]
[0027]
Inhibition of gastrinproductionusingdead cells of Lactobacillus bacteria 1. Materials and methods [Bacterial
As the bacteria, Lactobacillus gasseri OLL2716 (Meili
Dairies Corporation} was used.
Te inoculate a mouse, the Lactobacillus bacteria were grown in Difco™ MRS broth (Becton Dickinson} for 1 day.
Heat treatment of the Lactobacillus bacteria was carried out by incubation of the bacterial suspension at 100°C for 10 min,
[0028] [Mouse]
Sterile (germ-free, GF) BALB/c male mice were obtained from
CLEA Japan, Inc. GF litter mice ware bredusinga Trexler flexible plastic film isolator, and by giving sterilized feed and water.
[0029]
To colonize the bacteria to a mouse, 10° CFU of live bacteria were suspended in 0.5 mi of phosphate buffer (PBI), which is inoculated orally to a 8-week old mouse once using a gastric tube.
Ag a treatment with dead cells, 101% CFU of heat treated bacteria (dead cells) were suspended in 0.5 ml of phosphate buffer (PRS), which is inoculated dally via the stomach for 10 days. At days after the final inoculation, the stomach was removed and used for immunchistochemical analysis.
[0030] [Histological analysis]
For histopathlogical analysis of the stomach, the half of the stomach removed along the greater curvature was fixed in 4% buffered formalin, embedded invaraffinwaz, and cut into a section of 2 um. Then, in accordance with standard method, the section was stainedwithhematoxylinandeosin. Thethicknessof themuscle layers of the stomach was measured by a microscope (Olympus AXE0} alongthevertical axis, usinganalysissoftware (Clympus BPZ-BEW)
Measurement was carried cut at a total of 10 different points, and an average thickness of each region in the sample was obtained,
The number of nuclei in a rectangle (150 x 200 um} was counted in the muscle layer of each region of the stomach.
[0031]
For immunohistochemical analysis, a tissue section was deparaffinized, and boiled in a 10-mM phosphate buffer sclution
(pH 6.0) at 28°C for 15 min in an microwave oven, then blocked using 5% normal goat serum-containing PBS at room temperature for 14 min. The section was incubated with primary antibody at 4°C overnight, then incubated with secondary antibody labeled by a fluorescent marker at room temperature for 2 hours. Finally, the sample was treated with DAPI {4,6-diamidino-2-phenylindole) and
DARCO (1, 4-diazobicyclol2,2,2]octana}. Sliides were visualized using amicroscope {Kevence BZ-9000) set for fluorescence imaging.
For sections stained for gastrin-positive (production) cells in a random field with an interval of 1 mm from the pyloric antrum of amcuse along the axis of the gastric body to the pyloric antrum, morphological analysis was performed using AxioVission Rel.4.8 {Zelass).
[0032]
Ag the primary antibody, anti-gastrin antibodies (rabbit polycional antibody, Dakaco) diluted with 1:300, rabbit IgG (Dako) as control, and mouse IgG {Dako} as control were used. Ag the secondary antibody, goat anti-rabbit IgG Alexa 488 (Molecular
Probe} and goat anti-mouse Alexa 594 (Molecular Probe} were used. [00331 [Statistic analysis]
Regults were agpropriately and statistically evaluated using Student’s t test or one-way analysis of variance (ANOVAS.
Software programs of SSPS versicn 16.0 (8SPS) or GraphPad Prism {GraphPad Software) were used for the analysis of data.
[0034] 2, Results
For each ¢f the untreated GF mice, L. gasseri
OLLZ71i6-colonized gnotobiotic mice, PBRS-treated GF mice, and GF mice administered with heat-treated dead cells of L. gasseri
QLL2716, the number of gastrin-producing cells in the pyloric antrum of The stomach was counted. Results are shown in the table below. [Table 1]
Number of gastrin-producing cells at the pyloric antrum of the stomach
Host mouse Treatment Number of | Number of the mice gastrin-producing cells (/mm*) 84.341.7 °
L. gasseri | (-) 7 51.5+2.8"
OLLZ2716-colonized gnotobloticmice 80.8%4.1 *
GF Heat-treated 4 47.9£2.5
L. gasseri oLL27is @ a) The number of gastrin-producing cells in l1-mm length in the horizontal direction of the specimen. b)Mean = SE c)1¢” CFU of Lactobacillus bacteria were inoculated orally to a 8-week old GF host mouse using a gastric tube, and the mouse was assayed 10 davs after. 1D NTT = i T1 oo i ' : d)1¢ CFU of dead cells of heat-treated Lactobacillus bacteria were inoculated directly to the stomach of a B-week ¢id GF host mouse every day for 10 days before assay. *For the GF or GF/PBS group, p<0.001 in Tukey's t test.
[0035] 3. Discussion
In the GF mouse to which heat-treated Lactobacillus bacteria (dead cells) were orally administered, a decrease in the number of gastrin-producing cells at a degree similar to that induced by live bacteria was observed. Such a significant decrease was also observed for the case of Lactobacillus gasseri OLL2716.
[Industrial Applicability]
[0036]
When the gastrin production inhibitor of the present invention is used, secretion of gastric acid can be inhibited by its direct action on the cells that make up the gastric tissue, without using eradication action of H. pylori; and therefore, it can ke used as a pharmaceutical composition for the improvemant of gastritis, gastric ulcer and reflux esophagitis not caused by
H. pylori, as well as for the improvement of gastric hyperacidity folicwing eradication of H. pylori.
Moreover, for example in a fermented food by lactic acid bacteria, it is impossible to comprise live bacteria at an amount exceeding a certain level due to the nature of this food; however, since the gastrin production inhibitor of the present invention uses dead cells, it can be used in food compositions that comprise bacteria (live and dead bacteria) with an amount larger than that in a conventional food.

Claims (8)

[Claims]
1. A gastrin production inhibitor comprising dead cells of Lactobacillus bacterium.
2. A gastrin production inhibitor comprising dead cells, but no live cells, of Lactobacillus bacterium.
3. The gastrin production inhibitor according to Claim 1 or 2, wherein the Lactobacillus bacterium is Lactobacillus gasseri.
4, The gastrin production inhibitor according to Claim 1 or 2, wherein the Lactobacillus bacterium is Lactobacillus gasseri OLL2716 (accession number: FERM BP-6999).
5. A food composition comprising the gastrin production inhibitor according to any one of Claims 1 to 4.
6. The food composition according to Claim 5, which is a fermented food using lactic acid bacterium.
7. The food composition according to Claim 6, wherein the fermented food using lactic acid bacterium is fermented milk.
8. The food composition according to Claim 7, wherein the fermented milk is yogurt.
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