CN112574904A - Bifidobacterium V9 for regulating immunity and application thereof - Google Patents
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Classifications
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- A—HUMAN NECESSITIES
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- 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
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- A23L2/52—Adding ingredients
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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
- A23L33/135—Bacteria or derivatives thereof, e.g. probiotics
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- A—HUMAN NECESSITIES
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- A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
- A61K35/66—Microorganisms or materials therefrom
- A61K35/74—Bacteria
- A61K35/741—Probiotics
- A61K35/744—Lactic acid bacteria, e.g. enterococci, pediococci, lactococci, streptococci or leuconostocs
- A61K35/745—Bifidobacteria
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
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- A—HUMAN NECESSITIES
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Abstract
The invention discloses a bifidobacterium V9 for regulating immunity and application thereof. The bifidobacterium V9 has high viable count, and a lower amount of strains can play the role of enhancing immunity. Compared with commercial probiotics, the bifidobacterium V9 has high cost performance, is more substantial, and has obvious effect of improving immunity.
Description
Technical Field
The invention belongs to the field of microorganisms, and particularly relates to a bifidobacterium V9 for regulating immunity and application thereof.
Background
The immune enhancing effects of probiotics have been widely recognized. In productive life, the most common probiotics are bifidobacteria, which are important physiological bacteria in human intestinal tract and have physiological effects incomparable with various other normal physiological bacteria: regulating intestinal flora, enhancing immunity, etc.
The bifidobacterium plays a role in enhancing the immune defense system of the body by promoting and activating infection protection immune response of the body. The bifidobacterium colonizes in the intestinal tract, is equivalent to natural immunity, can activate the macrophage activity of the organism, induces specific and nonspecific immune reaction, and improves the anti-infection capacity; meanwhile, the bifidobacterium adjusts the relationship among the flora through the interaction between the bifidobacterium and other bacteria and metabolites thereof, maintains and ensures the optimal advantage combination and the stability of various combinations of the flora, prevents the colonization and invasion of pathogenic bacteria, and antagonizes the growth of the pathogenic bacteria and harmful microorganisms and the adhesion of toxins thereof.
Immunoregulatory ability has received widespread attention in recent years as a standard for screening probiotics and an important function of probiotics. Since 90% of diseases are related to immunity, the level of immunity directly determines whether a person is healthy or not. The immune system plays an important role in resisting the invasion of external harmful substances, so that more and better substances for improving the immunoregulatory capacity of the body are sought, and the immune system plays an important role in the future of researching and developing new health-care products.
Disclosure of Invention
The invention provides a bifidobacterium V9 for regulating immunity, which can solve one or more of the problems in the prior art.
Peptidoglycan, teichoic acid, lipoteichoic acid, S-layer protein and other cell wall associated polysaccharides are present on the surface of bifidobacteria. In addition, bifidobacteria also secrete substances with immunomodulatory activity, such as exopolysaccharides and other secreted proteins, extracellularly.
The viable count of Bifidobacterium V9 of the present invention is not less than 5.8 × 1011The bifidobacterium V9 is preserved in China general microbiological culture collection center with the preservation number: CGMCC No.4473, preservation date: 12/14/2010, storage address: china general microbiological culture Collection center.
The application detects cytokines, Toll-like receptors (TLRs), nuclear factor kappa B (NF-kappa B) and secretory immunoglobulin (sIgA) at the mRNA level and the protein level, researches the immune regulation capacity and the action mechanism of bifidobacterium, and provides a basis for developing a microecological preparation.
The invention also provides application of the bifidobacterium V9 in enhancing the immunity of the organism. The application evaluates the influence of bifidobacterium V9 on the immune function of a healthy mouse after being fed with the bifidobacterium V9, and detects Toll-like receptors, NF-kappa B and sIgA factor expression by observing the weight, delayed allergic reaction, lymphocyte transformation experiment, natural killer cell (NK cell) activity and using an ELISA kit of the mouse. The results show that bifidobacterium V9 of the invention can induce lymphocyte proliferation, enhance delayed type allergy and the transformation of splenic lymphocytes of mice; the bifidobacterium V9 can improve the activity of NK cells of the tested animals; the bifidobacterium V9 can improve the transcription of interleukin-10 (IL-10) and interferon-alpha (IFN-alpha) cell factors, can also improve the expression of NF-kB, has up-regulation effect on TLR-2 and sIgA, and is beneficial to resisting the infection of intestinal pathogenic microorganisms. Therefore, the bifidobacterium V9 has a positive effect on improving the immunity of the organism.
Upon entry into the gut, bifidobacterium V9 can be taken up by M cells in the peyer's patch and presented to the Antigen Presenting Cells (APC) within it. Bifidobacterium V9 can induce lymphocyte to secrete cytokines such as IL-4, IL-5, IL-10, IL-13 and transforming growth factor-beta (TGF-beta), promote differentiation of helper T cell 2(Th2), activate B lymphocyte to produce immunoglobulin E (IgE), mainly mediate humoral immune response, and play a role in resisting parasite infection in body. The optimal dose of Bifidobacterium has opposite regulation effects, and can inhibit Th2 differentiation, shift to Th1 differentiation, promote B lymphocyte to produce sIgA, and inhibit IgE expression. The transformed Th1 cell secretes cytokines such as IL-2, IL-8, IFN-alpha, IFN-gamma, IFN-beta, TNF-alpha, IL-12 and granulocyte-macrophage colony stimulating factor (GM-CSF), can activate cytotoxic T lymphocyte, enhance phagocyte activity, mainly mediate cell immune response, and play an important role in inhibiting tumor and virus. The high dose of Bifidobacterium can produce clone anergy and cause T lymph to generate anergy.
The bifidobacterium of the invention can improve the immune function of the organism by two aspects: firstly, the innate immune response can be improved, macrophages are activated, and pathogenic bacteria are treated by producing active oxygen and lysosomes; the bifidobacteria also activate the adaptive immune system, activate B cells, secrete a range of antibodies, and participate in humoral immune responses. In cellular immunity, bifidobacteria can enhance the phagocytic function of macrophages and can also activate the activity of T cells and NK cells to stimulate the body to generate immune response. In humoral immunity, bifidobacteria can enhance the ability of B lymphocytes to secrete antibodies.
The bifidobacterium V9 has high viable count, and is supported by a large amount of experimental data and proved by clinical tests, and toxicological experiments and safety evaluation are carried out. And a lower amount of the strain can exert the immune enhancement function. Compared with commercial probiotics, the bifidobacterium V9 has high cost performance, is more substantial, and has obvious effect of improving immunity.
Drawings
FIG. 1 is a schematic diagram of the preparation of Bifidobacterium strain V9 in accordance with the present invention;
FIG. 2 is a graph showing the effect of Bifidobacterium V9 of the present invention on IL-10;
FIG. 3 is a graph showing the effect of Bifidobacterium V9 of the present invention on IFN-. alpha.;
FIG. 4 is a graph of the effect of Bifidobacterium V9 of the present invention on TLR-2;
FIG. 5 is a graph showing the effect of Bifidobacterium V9 of the present invention on NF- κ B;
FIG. 6 shows the effect of Bifidobacterium V9 of the present invention on sIgA.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 schematically shows a schematic preparation of bifidobacterium V9 in accordance with an embodiment of the invention.
As shown in the figure, after the freeze-dried strain is activated for three generations, the freeze-dried strain is inoculated into an optimized culture medium for fermentation at 6% (v/v), and then the strain mud is obtained by centrifugal collection.
Preparing sterilized protective agent (skim milk powder), uniformly mixing the bacterial sludge and the protective agent according to the proportion (W/V) to obtain organic liquid, carrying out vacuum freeze drying to obtain freeze-dried coarse powder, crushing and sieving the coarse powder to obtain freeze-dried bifidobacterium V9 fine powder, subdividing bifidobacterium V9, inspecting, packaging, and warehousing for later use.
In the preparation method of the bifidobacterium V9, the optimized specific culture medium comprises 14 parts of lactose, 7 parts of beef extract, 14 parts of casein peptone, 6 parts of soybean peptone, 6 parts of yeast powder, 2 parts of disodium hydrogen phosphate, 2 parts of monopotassium phosphate, 2 parts of magnesium sulfate and 1 part of L-cysteine hydrochloride by weight.
Experimental samples: the living bacteria number of the bifidobacterium stems V9 of the invention can reach 5.8 x 1011/g。
Experimental animals: 48 SPF-grade Kunming female mice are selected and aged for 6-8 weeks (the weight is 18-22 g).
Dose and group: four groups of 12 animals each including a control group and low, medium and high dose groups were divided into 5 times (0.25 g/kg. BW), 10 times (0.5 g/kg. BW) and 30 times (1.5 g/kg. BW) of the recommended daily amount (0.05 g/kg. BW in terms of 30kg body weight of children).
Example 1
The feeding method comprises the following steps: 0.50 g, 1.00 g and 3.00g of bifidobacterium V9 sample are respectively weighed and prepared into 20mL of sample liquid by purified water, and the sample liquid is respectively used for intragastric administration of low, medium and high dose groups of animals. After animals were acclimated for three days in laboratory conditions, the following experiments each randomly divided 48 mice into four groups of 12 mice each, administered the test substance by gavage daily, the amount of the administered sample was adjusted according to the increase and decrease of body weight per week, and gavage was continued for four weeks. Sterile purified water was drenched to the control group.
Example 2
Delayed type allergic reaction test in mice (increase of plantar thickness)
On day 4 before the end of the experiment, the animals were immunized, 2% (v/v) sheep red blood cells were intraperitoneally injected with 0.2mL of sensitized animals, and after 5 days, the thickness of the plantar region of the left hind foot was measured, followed by subcutaneous injection of 20% (v/v) sheep red blood cells (20. mu.L/mouse) at that position, and the thickness of the plantar region of the left hind foot was measured three times 24 hours after the injection to obtain an average value.
Example 3
ConA-induced splenic lymphocyte transformation assay (MTT method) in mice
Lymphocyte proliferation reaction: the lymphocyte suspension was added to a 24-well plate in two wells, each well containing 1mL of the lymphocyte suspension, 75. mu.L of ConA solution (equivalent to 7.5. mu.g/mL) in one well, and 5% CO in the other well as a light2And culturing at 37 ℃ for 72 h. 4 hours before the end of the culture, 0.7mL of the supernatant was aspirated from each well, and 0.7mL of serum-free RPMI 1640 medium was added thereto together with 50. mu.L/well of MTT (5mg/mL), and the culture was continued for 4 hours. After the culture was completed, 1mL of isopropyl alcohol was added to each well, and the mixture was blown and beaten to dissolve the purple crystals, and the purple crystals were divided into 96-well plates as 3-well replicates, and the optical density value was measured at a wavelength of 570 nm.
Example 4
NK cell Activity assay (LDH method)
And (3) detecting the activity of NK cells: taking the concentration as 4 x 105YAC-1 target cells and effector cells of 100. mu.L each per mL (50: 1 ratio of effect to target) were added to a U-shaped 96-well plate; target cell natural release holes are filled with 100 mu L of target cells and culture solution respectively, and target cell maximum release holes are filled with 100 mu L of target cells and 100 mu L of 1% NP40 respectively; all the above-mentioned materials are equipped with three composite holes, at 37 deg.C and 5% CO2After 4 hours of incubation in an incubator, the 96-well plates were centrifuged at 1500rpm for 5 minutes, 100. mu.L of the supernatant was aspirated into each well and placed in a flat-bottomed 96-well plate, 100. mu.L of LDH matrix solution was added thereto, and the reaction was carried out for 3 minutes with 30. mu.L of HCl added at 1mol/L per well, and the optical density was measured at 492nm on an enzyme-linked immunosorbent.
Example 5
Cytokine, Toll-like receptor (TLR-2), NF-. kappa.B and sIgA assays
(1) And (4) separating serum. Four groups of animals in example 1 were removed and blood was collected. Treating blood in the centrifuge tube in 37 deg.C water bath for 10min, standing at 4 deg.C for 15min, and centrifuging at 3000rpm/min for 20 min. Carefully pipette the clear supernatant into a small clean centrifuge tube and store at-40 ℃ for use.
(2) And (4) detecting the cell factors. After thawing the frozen serum at room temperature, the following cytokines were detected according to the instructions of the ELISA test kit: IL-10, IFN-alpha.
(3) Toll-like receptor (TLR-2) and NF-. kappa.B assays: the method comprises the steps of adopting a cell freezing and thawing method, namely repeatedly freezing and thawing the separated mouse spleen lymphocytes for more than three times at room temperature and-40 ℃, centrifugally collecting supernate, and detecting each component by using an ELISA kit.
(4) And (3) sIgA detection: collecting and treating the intestinal contents of the mice according to the operation method of the kit, and detecting the contents in the contents according to the instruction of the ELISA detection kit.
Discussion of results
1. Animal experiments
1.1 Effect of Bifidobacterium V9 on mouse body weight
Effect of bifidobacterium V9 on mouse body weight: the delayed type allergic reaction group is shown in Table 1, and the lymphocyte transformation and NK activity assay group is shown in Table 2. The difference between the body weight of each dose group at each stage and the body weight of the control group at the corresponding stage has no significance, which indicates that the bifidobacterium V9 has no obvious influence on the body weight growth of the mice.
Table 1 effect of bifidobacterium V9 on mouse body weight (batch I, n ═ 12)
Table 2 effect of bifidobacterium V9 on mouse body weight (batch II, n ═ 12)
1.2 Effect of Bifidobacterium V9 on mouse spleen weight
Compared with the control group, the difference of the organ indexes of each dose group has no significant significance (see table 3). It was shown that bifidobacterium V9 had no significant effect on the spleen weight of the mice.
Table 3 effect of bifidobacterium V9 on mouse spleen weight (n ═ 12)
1.3 Effect of Bifidobacterium V9 on mouse Immunity
1.3.1 Effect of Bifidobacterium V9 on delayed allergy in mice sheep Red blood cell-induced delayed allergy test in mice (plantar thickening method), the plantar thickening values of the test subjects were significantly different from those of the control group (see Table 4).
Table 4 effect of probiotic electuary on delayed allergy in mice (n ═ 12)
1.3.2 Effect of Bifidobacterium V9 on ConA-induced splenic lymphocyte transformation in mice
For the ConA-induced splenic lymphocyte transformation reaction of mice, the difference of the optical density of the test object group is higher than that of the control group, and the difference has significant significance (see table 5). The result of the spleen lymphocyte transformation test of the bifidobacterium V9 is positive, and the tested sample has the function of enhancing the cellular immune function.
TABLE 5 Effect of Bifidobacterium on mouse splenic lymphocyte transformation response (n ═ 12)
1.3.3 Effect of Bifidobacterium V9 on NK cell Activity of test animals
The NK cell activity of the medium and high dose groups is higher than that of the control group, and the difference has significance (see table 6). The result of the test on the NK cell activity of the tested animal is positive by the bifidobacterium V9, and the tested sample has the function of enhancing the NK cell activity.
NK cell activity conversion value: x is Sin-1(p)1/2
Table 6 effect of probiotic infusion on NK cell activity in mice (n ═ 11)
2. Effect of Bifidobacterium V9 on IL-10
The effect of Bifidobacterium V9 on IL-10 levels in serum is shown in FIG. 2. After the gavage, the content of IL-10 can be improved by the bifidobacterium V9 in all the dose groups, after 20 days of the gavage, the content of IL-10 is obviously improved by the bifidobacterium V9 in low, medium and high doses (p is less than 0.05), and the differences of the content of IL-10 from 700pg/mL to 798pg/mL, 899pg/mL and 956pg/mL in the control group are respectively obvious (p is less than 0.05). The results show that the bifidobacterium V9 can increase the expression level of IL-10 in the body.
3. Effect of Bifidobacterium V9 on IFN-alpha
The effect of bifidobacterium V9 on IFN- α content in serum is shown in figure 3. After the gavage, the content of IL-10 can be increased by the bifidobacterium V9 in all dose groups, after 20 days of the gavage, the content of IFN-alpha (p is less than 0.05) is remarkably increased by the bifidobacterium V9 in low, medium and high doses, and the differences are remarkable (p is less than 0.05) compared with a control group respectively from 625pg/mL to 789pg/mL, 887pg/mL and 923pg/mL in the control group. The results show that the bifidobacterium V9 can increase the expression level of IFN-alpha of the organism and has obvious influence.
4. Effect of Bifidobacterium V9 on TLR-2
The effect of bifidobacterium V9 on Toll-like receptor 2(TLR-2) expression by mouse spleen lymphocytes is shown in figure 4. Bifidobacterium V9(14.7ng/mL) in the high dose group at day 10 of gavage significantly increased TLR-2 expression in lymphocytes (p < 0.05). Bifidobacterium V9 in the medium dose group also increased TLR-2 expression, but the results were not significant; on day 20 of gavage, bifidobacterium V9(15.1ng/mL) in the high dose group significantly increased TLR-2 expression in lymphocytes (p < 0.05). Bifidobacterium V9 in the medium dose group also increased TLR-2 expression, but the results were not significant;
5. effect of Bifidobacterium V9 on NF- κ B
The effect of Bifidobacterium V9 on NF-. kappa.B expression levels is shown in FIG. 5. On the 10 th day of gavage, bifidobacterium V9(10892pg/mL) in the high dose group significantly increased NF- κ B expression (p < 0.05) compared to the control group. Bifidobacterium V9 in the medium dose group also increased NF- κ B expression, but the results were not significant; on day 20 of gavage, bifidobacterium V9(14564pg/mL) in the high dose group significantly increased NF- κ B expression (p < 0.05), while bifidobacterium V9 in the medium dose group had no significant effect.
6. Effect of Bifidobacterium V9 on sIgA
The results of the intestinal mucosal secretory immunoglobulin A (sIgA) assay are shown in FIG. 6. On the 10 th day of gavage, all doses of bifidobacterium V9 increased the content of sIgA in the intestinal contents compared to the control group (50 ng/mL). The results show that bifidobacterium V9 can improve the concentration of sIgA in intestinal contents, particularly the concentration of sIgA reaches a peak value after 10 days of intragastric administration. In addition, bifidobacterium V9 in the high dose group did not produce more sIgA than in the medium dose group.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A Bifidobacterium V9 for regulating immunity, wherein the viable count of Bifidobacterium V9 is not less than 5.8 × 1011The bifidobacterium V9 is preserved in China general microbiological culture Collection center with the following preservation numbers: CGMCC No. 4473.
2. A Bifidobacterium V9 formulation for modulating immunity comprising Bifidobacterium V9 as claimed in claim 1.
3. Use of bifidobacterium V9 in a product for increasing the expression level of IL-10 in a body according to claim 1.
4. Use of bifidobacterium V9 in a product for increasing the expression level of IFN- α in the body according to claim 1.
5. Use of bifidobacterium V9 in accordance with claim 1 in products for inducing lymphocyte proliferation, enhancing delayed-type allergy and enhancing transformation of splenic lymphocytes in mice.
6. Use of bifidobacterium V9 in a product for increasing the expression of NF- κ B according to claim 1.
7. Use of bifidobacterium V9 in a product for increasing the expression of TLR-2 in lymphocytes, as claimed in claim 1.
8. Use of bifidobacterium V9 in a product for increasing the content of sIgA in intestinal contents according to claim 1.
9. Use of the bifidobacterium V9 in foods, pharmaceuticals and beverages for regulating immunity according to claim 1.
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CN102326678A (en) * | 2011-06-16 | 2012-01-25 | 高杰 | Penta-composite probiotic powder preparation and preparation method thereof |
US20120207713A1 (en) * | 2007-03-28 | 2012-08-16 | Alimentary Health Limited | Probiotic bifidobacterium strains |
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US20120207713A1 (en) * | 2007-03-28 | 2012-08-16 | Alimentary Health Limited | Probiotic bifidobacterium strains |
CN102326678A (en) * | 2011-06-16 | 2012-01-25 | 高杰 | Penta-composite probiotic powder preparation and preparation method thereof |
CN106212674A (en) * | 2016-08-05 | 2016-12-14 | 内蒙古普泽生物制品有限责任公司 | A kind of Yoghourt fermentation mix bacterium agent |
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