CN116870037A - Application of bifidobacterium adolescentis ATCC15703 or soluble polysaccharide component thereof in preparation of anti-aging pharmaceutical food or preparation targeting intestinal tract - Google Patents

Application of bifidobacterium adolescentis ATCC15703 or soluble polysaccharide component thereof in preparation of anti-aging pharmaceutical food or preparation targeting intestinal tract Download PDF

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CN116870037A
CN116870037A CN202310130338.8A CN202310130338A CN116870037A CN 116870037 A CN116870037 A CN 116870037A CN 202310130338 A CN202310130338 A CN 202310130338A CN 116870037 A CN116870037 A CN 116870037A
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bifidobacterium adolescentis
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CN116870037B (en
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王良静
陈淑洁
姒健敏
戚亚东
何嘉敏
王其温
张雅雯
徐继蕾
葛起伟
王岚
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Zhejiang University ZJU
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Abstract

The invention belongs to the technical field of probiotics, and particularly relates to application of bifidobacterium adolescentis ATCC15703 or polysaccharide components thereof. The bifidobacterium adolescentis ATCC15703 or the soluble polysaccharide component thereof provided by the invention can activate a wnt signal pathway to promote the self-renewal potential of intestinal stem cells by improving the number and the functions of panid cells in colon, so that the intestinal aging state taking an intestinal barrier as a center can be remarkably improved; the bifidobacterium adolescentis ATCC15703 or the soluble polysaccharide component thereof has obvious effect of improving intestinal aging, has definite target intestinal aging resisting mechanism, can be used as probiotics for clinical application in the field of health maintenance to relieve the aging process of organisms, and provides a new intervention means for preventing or resisting aging progress and reducing the occurrence and development of aging-related diseases.

Description

Application of bifidobacterium adolescentis ATCC15703 or soluble polysaccharide component thereof in preparation of anti-aging pharmaceutical food or preparation targeting intestinal tract
Technical Field
The invention relates to the technical field of probiotics, in particular to application of bifidobacterium adolescentis ATCC15703 or soluble polysaccharide components thereof in preparation of anti-aging pharmaceutical foods or preparations targeting intestinal tracts.
Background
The active health ability of the old is improved, the concept of healthy aging and active aging is built, and the healthy gateway is moved forward to the old with low age. In face of the challenges presented by aging, the prevention of aging has become more important and urgent to help the elderly to achieve healthy aging. Therefore, it is urgent to explore a high-efficiency and low-cost control method.
Intestinal epithelium is one of the fastest-renewing tissues in the human body, which protects the host initially from various harmful environmental factors and pathogens. Intestinal homeostasis has profound effects on multiple systems. Self-renewal of intestinal stem cells is an important process to maintain intestinal integrity. Previous studies have shown that aging of the intestinal tract is accompanied by dysfunction and failure of ISCs, which further increases the incidence of age-related intestinal disorders such as chronic constipation, diverticulosis of the colon, malnutrition and colorectal cancer. Thus, the search for a new strategy to promote ISCs regeneration might provide a clear prospect for regeneration of aged intestines.
There is increasing evidence that the intestinal microbiota undergoes tremendous changes over the lifetime. Unbalanced changes in microbial composition and related metabolites have been shown to be age-related. This age-related microbial dysbiosis further triggers a cascade of inflammatory events, leading to intestinal leakage and affecting the overall health of the host. A recent study showed that fecal microbiota transplantation can attenuate the accelerated aging phenotype and extend the longevity of pre-matured mice. This provides an opportunity for slowing or even reversing age-related changes and diseases through microbiological interventions such as probiotics, synbiotics, dietary changes to microbiota, etc.
Bifidobacterium adolescentis is a completely anaerobic gram-positive bacterium in the normal intestinal tract of an adult, can autonomously reproduce, maintain the balance of intestinal flora, regulate the intestinal homeostasis of the human body, and is proved to be capable of relieving acute and chronic diarrhea and constipation, improving inflammatory bowel disease and delaying aging. Given the outstanding manifestations of bifidobacteria adolescentis in improving overall ageing, their protective effect on the ageing colon is still unknown.
Disclosure of Invention
The first object of the present invention is to provide the use of bifidobacterium adolescentis ATCC15703 or of the soluble polysaccharide fraction (SPS) thereof for the preparation of an anti-ageing pharmaceutical food or preparation targeting the intestinal tract.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
as a preferred technical scheme of the invention: the intestine-targeted anti-aging pharmaceutical food or formulation prevents and improves the intestinal aging performance by at least one of the following:
1) Improving the intestinal aging performance, including mucosal thickness, crypt depth, colon stem cell density, and inflammation level;
2) Significantly improving the sprouting rate and growth status of the intestinal derived colon organoids;
3) Increasing the number of panid cells in an intestinal stem cell supporting environment;
4) Activating wnt signaling pathway in intestinal stem cells.
As a preferred technical scheme of the invention: the equivalent viable count of bifidobacterium adolescentis ATCC15703 or soluble polysaccharide component (SPS) in the intestine-targeted anti-aging pharmaceutical food or preparation is not less than 10 9 CFU/g or 10 9 CFU/mL。
As a preferred technical scheme of the invention: the anti-aging pharmaceutical food targeting the intestinal tract is a medicine, a health food or a food.
As a preferred technical scheme of the invention: the medicine comprises a medicine carrier and/or pharmaceutically acceptable auxiliary materials
As a preferred technical scheme of the invention: the food includes special medical food, solid beverage, dietary fiber, dairy product, bean product, cake or animal feed.
As a preferable technical scheme of the invention, the anti-aging medicines, the health-care foods and the food preparations are liquid preparations, capsule preparations or compound tablets.
The second object of the present invention is to provide the use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for the preparation of wnt family secretion protein expression promoters or wnt signal pathway expression promoters or panid cell expression promoters.
A third object of the present invention is to provide the use of Bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for increasing the germination rate and growth status of an intestinal-derived colon organoid.
A fourth object of the present invention is to provide the use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for increasing the level of wnt signalling pathways in colon stem cells.
A fifth object of the present invention is to provide the use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for increasing the number of panid cells in intestinal tissue and derived colon organoids.
The bifidobacterium adolescentis ATCC15703 or the soluble polysaccharide component thereof provided by the invention can activate a wnt signal pathway to promote the self-renewal potential of intestinal stem cells by improving the number and the functions of panid cells in colon, so that the intestinal aging state taking an intestinal barrier as a center can be remarkably improved; the bifidobacterium adolescentis ATCC15703 or the soluble polysaccharide component thereof has obvious effect of improving intestinal aging, has definite target intestinal aging resisting mechanism, can be used as probiotics for clinical application in the field of health maintenance to relieve the aging process of organisms, and provides a new intervention means for preventing or resisting aging progress and reducing the occurrence and development of aging-related diseases. Compared with the prior art, the invention has at least the following advantages or beneficial effects:
(1) Bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof improves intestinal age-improving performance from many aspects: including mucosal thickness, crypt depth, colon stem cell density, and inflammation level; at present, no related literature and patent report exists, and the traditional Chinese medicine composition can be used as a beneficial supplement of the current anti-aging probiotic treatment means targeting the intestinal tract.
(2) Bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide component thereof is capable of significantly improving the germination rate and growth status of intestinal derived colon organoids in vitro and in vivo.
(3) Bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof is able to increase wnt signalling pathway levels in colon stem cells.
(4) Bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof is capable of significantly increasing the number of panid cells in intestinal tissue and derived organoids in vitro and in vivo.
(5) The bifidobacterium adolescentis ATCC15703 or the soluble polysaccharide component thereof takes colon Pantoea cells as a downstream important target spot, promotes the secretion of wnt protein families, further activates colon stem cells, and provides a new clue and a new idea for exploring intestinal tract aging in the future.
Drawings
FIG. 1 is a graphical representation of the effect of bifidobacterium adolescentis ATCC15703 on restoring intestinal stem cells to alleviate the ageing intestinal phenotype in example 1; in the figure, A is H & E staining in the intestinal tract after intervention of bifidobacterium adolescentis ATCC15703, muc2 staining, PAS staining, B.a bacterial FISH probe staining, lgr5 staining and staining of barrier protein (ZO-1, occludin); b is the transcript level of the colonic mucosa height and senescence-associated genes (P21, P53) and the stem cell gene Lgr 5.
FIG. 2 is a graphical representation of the effect of bifidobacterium adolescentis ATCC15703 on promoting proliferation of colon organoids derived from aging mice in example 2. In the figure, A is a schematic drawing of colon organoid extraction; B. c is the action and quantitative statistics of bifidobacterium adolescentis ATCC15703 on colon organoids of the G3 aging model mice respectively; D. e is the action and quantitative statistics of bifidobacterium adolescentis ATCC15703 on colon organoids of a natural aging model mouse respectively; f is the transcript level of the dry gene Lgr5 of the two organoid models.
FIG. 3 is a graphical representation of the effect of bifidobacterium adolescentis ATCC15703 in example 3 on increasing wnt signaling in colon organoids. FIG. A is a transcript level of the wnt signaling pathway-related gene after intervention of bifidobacterium adolescentis ATCC15703 in the colon organoid; B. c, D are the expression levels of important target genes of wnt signaling pathway after intervention of bifidobacterium adolescentis ATCC15703 on colon organoids, respectively.
FIG. 4 is a graphical representation of the effects of Pantoea adolescentis cells in example 4 on the maintenance of dryness of bifidobacterium adolescentis ATCC 15703. In the figure, A is the expression level of wnt secretion protein family after intervention of bifidobacterium adolescentis ATCC15703 in colon organoid; b is the expression level of a panduran cell-related gene after intervention of bifidobacterium adolescentis ATCC15703 in colon organoids; c is the fluorescent co-localization of bifidobacterium adolescentis ATCC15703 in the intervention of colon organoid stem cells and Pantoea inodorsum cells; d is the expression correlation of the pannocyte-like gene in the elderly population.
FIG. 5 is a schematic representation of the soluble polysaccharide fraction (SPS) effect fraction of bifidobacterium adolescentis ATCC15703 in example 5. In the figure, A is a schematic diagram of an extraction flow of main coarse components of bifidobacterium adolescentis; B. c, D the action and quantitative statistics of the broken supernatant and sediment of the bifidobacterium adolescentis on the colon organoids of the mice; E. f, G the action of the broken soluble polysaccharide component, lipid component and peptidoglycan component of Bifidobacterium adolescentis on colon organoids of mice and quantitative statistics are carried out respectively.
Detailed Description
The invention is further illustrated in the following drawings and specific examples, which are not intended to limit the invention in any way.
Example 1: bifidobacterium adolescentis ATCC15703 relieves the ageing intestinal phenotype by recovering intestinal stem cells
The generation 0 Terc heterozygote mice are used for continuously breeding the generation 0 Terc knockout mice, which are used for constructing a third generation telomerase knockout mouse (G3 premature senility mice) model and littermates thereof, and the experiments are divided into 3 groups. Three groups were perfused with PBS, PBS and Bifidobacterium adolescentis ATCC15703, at a dose of 1X 10 9 CFU/mouse, the amount of lavage was 200. Mu.L, and the lavage was performed once every other day. After the modeling is completed, the mice are dissected, the intestinal length is counted, and the mice are processed through H&E staining shows intestinal epithelial morphology, shows barrier function related indexes such as goblet cell number by PAS staining and Muc2 immunofluorescence staining, shows stem cell number by Lgr5 immunofluorescence staining, and determines the spatial localization of bifidobacterium adolescentis ATCC15703 by a FISH probe.
The results shown in FIG. 1A, in which bifidobacterium adolescentis ATCC15703 was able to up-regulate the crypt height, increase PAS+ goblet cells and up-regulate the levels of Occlutin and ZO-1 in G3 presenility model mice, and the results shown in FIG. 1B, in which bifidobacterium adolescentis ATCC15703 down-regulates the expression of senescence-associated genes p21, p53 by about 50%, suggest that bifidobacterium adolescentis ATCC15703 can improve intestinal barrier function under senescence conditions. At the same time, bifidobacterium adolescentis ATCC15703 likewise increases Lgr5 + ISCs numbers and up-regulation of Lgr5 gene expression levels to 200% suggest that improvement of intestinal barrier function is mediated by intestinal stem cells.
Example 2: bifidobacterium adolescentis ATCC15703 for improving growth of various colon organoid senescence models
To further determine the effect of promoting bifidobacterium adolescentis ATCC 15703. As shown in fig. 2 a, colon organoids of G3 old mice and 12 month old natural aging mice were extracted, respectively: a1.5 cm sample of the colon tissue of the mouse was taken and the intestinal contents were flushed with sterile PBS. The intestinal segments were cut, and the tissue was cut into small pieces and then placed in 10mM EDTA solution and digested with shaking at 4℃for 30min at 10-20 rpm. The samples were centrifuged and resuspended in 10mL pre-chilled DMEM/F-12 medium and counted, mixed with matrigel containing complete organoid growth medium and inoculated in 24 well plates. After the matrigel is solidified, 500 mu L of complete culture medium is added, and the mixture is placed at 37 ℃ and 5% CO 2 Culturing in an incubator. After the third day organoids were grown stable, the intestinal organoids were co-cultured with bifidobacterium adolescentis ATCC15703 (moi=100:1), followed by observation of organoid growth indicators (diameter and bud number) on the fifth and seventh days. At the end of the seventh day of growth, organoid RNA was extracted and assayed for Lgr5 transcript levels.
The results are shown in fig. 2 a and B: bifidobacterium adolescentis ATCC15703 has obvious proliferation promoting effect on colon crypt organoids derived from two aging model mice, and organoid germination rate and diameter are increased by about 20-50%. The results are shown in fig. 2C: the increased transcript level of the Lgr5 gene in both derived organoids was about 20%, indicating that bifidobacterium adolescentis ATCC15703 has an improving effect against the colonic organoid senescence model in a variety of senescence models.
Example 3: bifidobacterium adolescentis ATCC15703 increases organoid wnt signalling pathway levels
To explore the mechanism of promotion by bifidobacterium adolescentis ATCC15703, the colon organoids of mice were co-cultured with bifidobacterium adolescentis ATCC15703 (moi=100:1) as described previously, and RNA was extracted on day seven. The expression of the genes related to the signal paths such as wnt, notch and the like is detected by qPCR, immunofluorescence and western blotting.
As shown in FIGS. 3A and B, bifidobacterium adolescentis ATCC15703 increased the transcriptional expression level of the wnt signaling pathway target genes CyclinD1, c-Myc to 150% -200% by detecting the wnt and notch pathway gene expression heat maps. As shown in FIG. 3C, immunofluorescence experiments showed that Bifidobacterium adolescentis ATCC15703 increases the proportion of active-beta-catenin nuclear-entering fluorescence in organoids. As shown in fig. 3D, bifidobacterium adolescentis ATCC15703 can significantly increase the expression level of key proteins of wnt signaling pathway to 2-4 fold at the protein level.
Example 4: the maintenance of organoid dryness by bifidobacterium adolescentis ATCC15703 is mediated by panid cells
Panda-like cells are considered as effective supporting cells in the microenvironment of intestinal stem cells, and can promote the growth and development of the supporting intestinal stem cells through the action mode similar to panda cells. Expression levels of wnt secretory protein family genes in colon organoids after intervention by bifidobacterium adolescentis ATCC15703 were analyzed by qPCR. The expression of the pannocyte-related genes (Lyz, reg 4) was then further examined in tissue samples and organoid samples.
As shown in FIGS. 4A and B, bifidobacterium adolescentis ATCC15703 can increase the transcription level and protein expression level of Lyz, reg4 in organoids and bodies. As shown in fig. 4C, immunofluorescence data showed that bifidobacterium adolescentis ATCC15703 can increase the relative intensity of Lyz and lgr5 fluorescence of organoids and intestinal tissues in vivo, suggesting that it can increase panid cell expression in vivo as well as in vitro. In a clinical human colon sample, the pandura-like related genes Lyz, reg4 and age are also found to have negative correlation, the Lyz and age correlation coefficient is as high as r= -0.7014, and the Reg4 and age correlation coefficient is as high as r= -0.3929.
Example 5: acquisition and effectiveness verification of soluble polysaccharide component of bifidobacterium adolescentis ATCC15703
In order to explore the role of the thallus components in the dryness promoting effect, the thallus components are separated and purified. Inoculating and culturing Bifidobacterium adolescentis ATCC157037 to logarithmic phase, centrifuging to remove supernatant, heat inactivating (95 deg.C, 15-30 min), ultrasonic (50-60 kH) and trichloroacetic acid (4-10%) to break bacterial cells, releasing content, co-culturing supernatant and precipitate with intestinal organoids respectively, and observing organoid growth index (diameter and bud number) on fifth and seventh days. At the end of the seventh day of growth, organoid RNA was extracted and assayed for Lgr5 transcript levels. Further, extracting and purifying lipid components from the crushed mixture by using an organic solvent, deproteinizing by using a plurality of proteases, and obtaining a peptidoglycan shell component after precipitation and cleaning; and simultaneously, obtaining the crude extract of the soluble polysaccharide by adopting a water extraction and alcohol precipitation method (volume ratio is 1:3). Finally, the bifidobacterium adolescentis ATCC15703 soluble polysaccharide component is obtained through dialysis and freeze-drying. These three components were co-cultured with the intestinal organoids separately, and organoid growth indicators (diameter and bud number) were then observed on the fifth and seventh days. At the end of the seventh day of growth, organoid RNA was extracted and assayed for Lgr5 transcript levels.
As shown in fig. 5 a, organoid co-culture experiments were performed after the end of the procedure for crude component extraction of bifidobacterium adolescentis ATCC 15703. As shown in FIGS. 5, B, C and D, the supernatant of Bifidobacterium adolescentis ATCC15703 in the disrupted fraction and the crude fraction of the sediment, the supernatant fraction has a promoting effect on mouse-derived crypt organoids, and the results show that it increases the germination rate and diameter by about 150% -200%, and increases the level of Lgr5, ascl2 dry gene expression by about 2-3 times. As shown in FIGS. 5, E, G and F, the lipid, peptidoglycan and soluble polysaccharide components of Bifidobacterium adolescentis ATCC15703 promote mouse-derived crypt organoids, which result in increased sprouting rates and diameters of about 150% and increased Lgr5, ascl2 dry gene expression levels by about 2-fold.
The above detailed description is intended to illustrate the present invention by way of example only and not to limit the invention to the particular embodiments disclosed, but to limit the invention to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. Use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for the preparation of an anti-ageing pharmaceutical food or preparation targeting the intestinal tract.
2. The use according to claim 1, wherein the intestine-targeted anti-aging pharmaceutical food or formulation prevents and improves the intestinal aging state by at least one of the following:
1) Improving the intestinal aging performance, including mucosal thickness, crypt depth, colon stem cell density, and inflammation level;
2) Significantly improving the sprouting rate and growth status of the intestinal derived colon organoids;
3) Increasing the number of panid cells in an intestinal stem cell supporting environment;
4) Activating wnt signaling pathway in intestinal stem cells.
3. The use according to claim 1, characterized in that: the anti-aging pharmaceutical food targeting the intestinal tract is a medicine, a health food or a food.
4. A use according to claim 3, characterized in that: the medicine comprises a medicine carrier and/or pharmaceutically acceptable auxiliary materials.
5. A use according to claim 3, characterized in that: the food includes special medical food, solid beverage, dietary fiber, dairy product, bean product, cake or animal feed.
6. A use according to claim 3, characterized in that: the medicine or health food or the formulation of the food is liquid preparation, capsule preparation or compound tablet.
7. Use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for the preparation of a wnt family secretion protein expression promoter or a wnt signal pathway expression promoter or a panid cell expression promoter.
8. Use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for increasing the germination rate and growth status of intestinal derived colon organoids.
9. Use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for increasing wnt signalling pathway levels in colon stem cells.
10. Use of bifidobacterium adolescentis ATCC15703 or a soluble polysaccharide fraction thereof for increasing the number of panid cells in intestinal tissue and derived colon organoids.
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