CN116942685A - Application of acidic goat milk oligosaccharide composition in preparation of antiallergic drugs or foods - Google Patents
Application of acidic goat milk oligosaccharide composition in preparation of antiallergic drugs or foods Download PDFInfo
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- CN116942685A CN116942685A CN202310998230.0A CN202310998230A CN116942685A CN 116942685 A CN116942685 A CN 116942685A CN 202310998230 A CN202310998230 A CN 202310998230A CN 116942685 A CN116942685 A CN 116942685A
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- sugar chains
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- goat milk
- acidic
- sialylated
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- 230000008673 vomiting Effects 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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Abstract
The invention relates to the use of an acidic goat milk oligosaccharide composition for the preparation of an antiallergic drug or food, said composition comprising 24 acidic sugar chains 24SMAOs, said 24SMAOs comprising 12 Neu5Ac modified sialylated sugar chains, 10 Neu5Gc modified sialylated sugar chains and 2 sialylated sugar chains having both Neu5Ac and Neu5Gc modifications, classified according to the sialyl linkage, comprising 11 alpha 2,3 linked sialyl sugar chains, 10 alpha 2,6 linked sialyl sugar chains and 3 sialyl sugar chains having both alpha 2,3 and alpha 2,6 linkages, classified according to the sialyl structure. The composition belongs to natural antiallergic substances, has safety and effectiveness, and realizes excellent antiallergic performance.
Description
Technical Field
The invention belongs to the field of biological preparations, and particularly relates to application of an acidic goat milk oligosaccharide composition in preparation of antiallergic drugs or foods.
Background
Food Allergy (FA) is an abnormal immune response characterized by the involvement of allergen-specific immunoglobulins E (IgE) and Th2 cells. Research shows that the development of immune cells and cytokines (interleukin (IL) -4), active medium (beta-Hex and histamine) and the like produced by the immune cells can cause a series of allergic symptoms such as vomiting, diarrhea, anaphylactic shock and death and the like of organisms, and the development of immune cells and the cytokines (beta-Hex and histamine) and the like cause great threat to public health safety. Currently, therapeutic drugs for food allergy (epinephrine, antihistamine or glucocorticoid) do not fundamentally eliminate the sensitivity of the allergen to the patient, and may cause drug dependence or even adverse reaction. Therefore, it is important to find safe and effective natural antiallergic substances to reduce the risk of food allergy.
Disclosure of Invention
The invention provides an application of an acidic goat milk oligosaccharide composition in preparing antiallergic drugs or foods, solves the technical problem that natural antiallergic substances are lacking in the prior art, can relieve intestinal injury and inflammation, and has excellent antiallergic activity.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
use of an acidic goat milk oligosaccharide composition comprising 24 acidic sugar chains 24SMAOS, said 24SMAOS comprising 12 Neu5Ac modified sialylated sugar chains, 10 Neu5Gc modified sialylated sugar chains and 2 sialylated sugar chains having both Neu5Ac and Neu5Gc modifications, classified according to sialic acid linkage, comprising 11 α2,3 linked sialyl sugar chains, 10 α2,6 linked sialyl sugar chains and 3 sialyl sugar chains having both α2,3 and α2,6 linkages, in the manufacture of an antiallergic medicament or food.
Further, the content of the 12 kinds of Neu5Ac modified sialylated sugar chains was 52%, the content of the 10 kinds of Neu5Gc modified sialylated sugar chains was 45%, and the content of the 2 kinds of sialylated sugar chains having both Neu5Ac modification and Neu5Gc modification was 3%.
Further, the content of the 11 kinds of α2, 3-linked sialyl sugar chains was 28%, the content of the 10 kinds of α2, 6-linked sialyl sugar chains was 68%, and the content of the 3 kinds of α2, 3-and α2, 6-linked sialyl sugar chains was 4%.
Further, the composition alleviates intestinal damage and inflammation.
Further, the composition reduces sIgE, histamine, igG2a, IFN-gamma, IL-4 in serum.
Further, the composition induces differentiation of Treg cells.
Further, the composition not only regulates the relative abundance of Lachnospiraceae, erysipelotrichaceae and Bactoidaceae to return to normal levels, but also promotes proliferation of beneficial bacteria Lactobacillaceae, marinifilaceae and Clostridia caerulea, reduces the relative abundance of Desulfovibrionaeae, and promotes the relative abundance of Prevotellaceae, marinifilaceae and Lactobacilli.
Further, the composition increases the concentration of acetic acid, propionic acid, and isobutyric acid in the intestinal tract.
Further, the composition restores the expression of the O-sugar chain of colistin.
Further, the composition is prepared by the following method: taking a certain amount of sheep milk, thawing at normal temperature, and centrifuging to remove fat; adding ethanol with the volume of 2 times of the goat milk, fully and uniformly mixing, centrifuging, collecting supernatant, and freeze-concentrating and drying to obtain freeze-dried goat milk crude oligosaccharide; dissolving the freeze-dried crude goat milk oligosaccharide in double distilled water, slowly adding the double distilled water into a DEAE-52 cellulose chromatographic column, eluting neutral goat milk oligosaccharide by double distilled water, and continuously adding 0.25MNaCl solution to elute acidic goat milk oligosaccharide; washing the acidic goat milk oligosaccharide with graphite carbon column to remove salt, and obtaining the composition.
Further, the conditions of both centrifugation processes include: 3-5 ℃,8000-13000rpm,15-30min.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the acidic goat milk oligosaccharide composition is derived from goat milk, belongs to natural antiallergic substances, and has safety and effectiveness;
2. the acidic goat milk oligosaccharide composition provided by the invention maximally retains the antiallergic active ingredients in goat milk, and obtains excellent antiallergic performance;
3. the acidic goat milk oligosaccharide composition disclosed by the invention can relieve intestinal injury and inflammation, reduce sIgE, histamine, igG2a, IFN-gamma and IL-4 in serum, induce Treg cell differentiation to inhibit Th2 reaction, regulate the relative abundance of Lachnospiraceae, erysipelotrichaceae and Bactoidaceae to be recovered to a normal level, promote the proliferation of beneficial bacteria Lactobacillaceae, marinifilaceae and Clostridia acede, reduce the relative abundance of Desulfovineiganaceae, promote the relative abundance of Prevotellaceae, marinifilaceae and Lactobacteriaceae, improve the concentration of acetic acid, propionic acid and isobutyric acid in intestinal tracts, recover the expression of mucin O-sugar chains and realize an antiallergic function.
Drawings
FIG. 1 is an antiallergic activity evaluation of example 1 and comparative example 1 of the present invention;
FIG. 2 shows the effect of example 1 and comparative example 1 of the invention on antibodies, allergic mediators and cytokines in mouse serum;
FIG. 3 is the effect of example 1 and comparative example 1 of the invention on the differentiation of mouse mesenteric lymph node cell Treg cells;
FIG. 4 shows the effect of example 1 and comparative example 1 of the present invention on intestinal microorganisms in mice;
FIG. 5 shows the effect of example 1 and comparative example 1 of the present invention on short chain fatty acids in mouse feces;
FIG. 6 is the effect of example 1 and comparative example 1 of the present invention on the O-glycosylation level of colistin;
FIG. 7 shows qualitative and quantitative analyses of example 1 and comparative example 1 of the present invention.
Detailed Description
The principles and features of the present invention are described below in connection with the following examples, which are set forth to illustrate, but are not to be construed as limiting the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Materials:
goat milk (Shaneng milk goat, mature milk, 30 mixed samples) was provided by the milk goat breeding base of the red star meiling stock company. Cow's milk (Hestent cow, mature milk, 30 mixed samples in China) is supplied from the Yan Liangou sea pasture of Sian, shaanxi, so the samples are transferred to a-80℃refrigerator for storage within 2 hours. Aniline, deuterated (d 5-) aniline, activated carbon, ovalbumin (OVA), aluminum adjuvant, protease inhibitor (PMSF) were all purchased from Sigma-Aldrich, usa; loratadine (Lora) was purchased from Cinnan Possen pharmaceutical Co., ltd; sep-PakC18 (200 mg/3 mL) and Porous Graphitic Carbon (PGC) (150 mg/3 mL) solid phase extraction cartridges are products of Simonaldrich, germany. DEAE-52 cellulose was purchased from Synbiotics Biotech Inc. The other reagents were all analytically pure. The water used in the experiments was purified by the Milli-Q ultra pure water system of Millipore, U.S.A..
Example 1:
thawing 2L of goat milk at normal temperature, centrifuging to remove fat (8000 rpm,20 min), adding 2 times volume of ethanol respectively, mixing completely, centrifuging (10000 rpm,30 min), collecting supernatant, and freeze concentrating and drying to obtain lyophilized goat milk crude oligosaccharide. Dissolving the freeze-dried crude goat milk oligosaccharide in double distilled water, slowly adding the double distilled water into a DEAE-52 cellulose chromatographic column, eluting the neutral goat milk oligosaccharide by using 3 times of column volume double distilled water, and continuously adding 3 times of column volume 0.25MNaCl solution to elute the acidic goat milk oligosaccharide. The acidic goat milk oligosaccharide obtained above was washed with water using a graphite carbon column to remove salt, to obtain the acidic goat milk oligosaccharide composition of example 1. The above neutral goat milk oligosaccharide was loaded on an activated carbon column, lactose was removed by 10 times of 8% ethanol in the column volume, and then eluted by 3 times of 70% ethanol in the column volume, to obtain a lactose-removed neutral goat milk oligosaccharide composition of example 1.
Comparative example 1:
the difference from example 1 is that: the acidic milk oligosaccharide composition and the neutral milk oligosaccharide composition of comparative example 1 were obtained by substituting the goat milk of example 1 with cow milk.
Test experiment:
1. evaluation of antiallergic Activity in mice
Female Balb/c mice (body weight 20.+ -.2 g) of the 6 week old clean class were offered by the university of Western An traffic medical college animal center. Balb/c mice were kept in SPF-grade environment, at standard temperature (21-23 ℃) and humidity (45-55%), and after one week of adaptive feeding, subsequent experiments were performed. All animal experiments were approved for animal management and ethics at university of northwest (ethical approval No. NWU-AWC-20210903M).
Mice were randomly divided into 7 groups (control group (blank group), OVA group (model group), lora group (loratadine drug group), SGMOs group (acid galactooligosaccharide composition of example 1), NGMOs group (neutral galactooligosaccharide composition of example 1), SBMOs group (acid galactooligosaccharide composition of comparative example 1), and NBMOs group (neutral galactooligosaccharide composition of comparative example 1)), 6 each. All other groups except the control group were intraperitoneally injected with 200 μl of sensitization solution (OVA: aluminum adjuvant: pbs=1:1:1 (v: v)) on day 0 and day 14 for 2 induction sensitization. From 27 to 40 days, control and OVA mice were gavaged with PBS, lora with loratadine (0.2 mg/kg), and the other mice were gavaged daily with SGMOs, NGMOs, SBMOs and NBMOs (100 mg/kg), respectively. Meanwhile, on days 28-, 30-, 32-, 34-, 36-and 38-, mice were challenged with 50mgOVA solution (except for the control group), and allergic symptoms and body weights of the mice were recorded. On day 40 of the experiment, fresh stool samples were collected for 16SrRNA sequencing. At day 41, the rectal temperature and organ weight of the mice were measured and the blood, colon and fecal content was collected. Jejunal tissue from each group of mice was collected, placed in 4% paraformaldehyde fixative, dehydrated in graded ethanol solution, and embedded in paraffin. The tissue samples were then sectioned and stained with hematoxylin and eosin (H & E), respectively. The sections were sealed with neutral gel, the sections were observed with a microscope and images were collected.
Construction of OVA-sensitized mouse model As shown in FIG. 1A, balb/c mice were subjected to 6 OVA shots (50 mg/kg), and after 2 weeks of oligosaccharide sample feeding, allergic symptoms of the mice were analyzed (FIGS. 1B-1I). Compared with the control group, the colon of the OVA group mice showed obvious loose stool (figure 1B), severe allergic symptoms such as the symptoms of the flexible cheeks of the gripping ears and the rash of the tails (figure 1C), the weight of the mice (figure 1D) and the rectal temperature of the mice were significantly increased (figure 1E) (p < 0.05), which indicates that the allergic model construction was successful. Compared with OVA group, the gastric lavage oligosaccharide sample and the loratadine (Lora) positive medicament can restore the form of the mouse feces to be normal, and obviously reduce the score of the allergic symptoms (p is less than 0.05). Furthermore, SGMOs, NGMOs and Lora significantly alleviated weight loss in mice (p < 0.05), SGMOs, NGMOs, SBMOs and Lora significantly raised rectal temperature in mice, with the change in rectal temperature in mice of the SGMOs and Lora groups being significantly higher than that of the NGMOs, SBMOs and NBMOs groups (p < 0.05). The thymus index (fig. 1F) and spleen index (fig. 1G) were significantly elevated in OVA mice compared to control, and both the oligosaccharide treated mice and the Lora mice significantly reduced the thymus index (p < 0.05) compared to OVA, wherein the SGMOs thymus index was significantly lower than that of NBMOs (p < 0.05). Although OVA, lora and oligosaccharides had no effect on the length of the colon of the mice (fig. 1H), the results of tissue sections of jejunum showed that oligosaccharides were able to alleviate OVA-induced intestinal injury and inflammation (fig. 1I).
2. Effects of antibodies, allergic Medium and cytokines in mouse serum
As shown in FIG. 2, by detecting the expression of specific antibodies, allergic mediators and cytokines in the mouse serum, it was found that the levels of sIgE, igG2a, histamine, IFN-gamma, IL-4 in the serum of the OVA group of mice were significantly increased (p < 0.05) compared to control, indicating that the food allergy model of the OVA-induced Balb/c mice was successfully constructed. The level of ige (fig. 2A) and histamine (fig. 2B) was significantly reduced (p < 0.05) in serum from mice in the Lora group versus all oligosaccharide groups compared to OVA group, demonstrating that oligosaccharides have antiallergic activity. Food allergy is a type I allergic disease, associated with a shift in Th1 and Th2 balance towards Th 2. The Lora and oligosaccharide groups significantly reduced production of the Th 1-type cytokines IgG2a (fig. 2C) and IFN- γ (fig. 2D) (p < 0.05) compared to OVA groups, wherein the SGMOs group mice had significantly higher expression levels of IFN- γ than SBMOs and NBMOs groups, indicating that SGMOs induced a Th 1-type response that was stronger than BMOs. The Lora and oligosaccharide groups significantly reduced production of the Th 2-type cytokine IL-4 (fig. 2E) (p < 0.05) compared to OVA groups, with the expression level of mouse IL-4 in SGMOs groups significantly lower than NGMOs groups, indicating that SGMOs inhibit Th 2-type responses more strongly than NGMOs. The levels of anti-inflammatory factor IL-10 (FIG. 2F) were significantly increased (p < 0.05) in the serum of mice from the SGMOs, NGMOs and NBMOs groups compared to the OVA group. In conclusion, the milk oligosaccharides can inhibit Th2 reaction by reducing Th2 cytokines, reduce the production of sIgE and histamine, relieve allergic symptoms, and in addition, compared with neutral NGMOs, acidic SGMOs significantly inhibit Th2 reaction; goat milk SGMOs significantly promoted Th1 cytokine production compared to cow milk SBMOs.
3. Mouse mesenteric lymph node CD4 + Foxp3 + Effect of Treg cell differentiation
Regulatory T cells (Tregs) as immunosuppressive CD4 + T cells, CD4 + CD25 + Foxp3 + Is the main phenotype of Treg cells, mainly secretes cytokines such as IL-10 in vivo, inhibits the activation of T cells, and plays an immunosuppressive role. As shown in fig. 3, treg cell specific antibodies (CD 4) were detected in mouse mesenteric lymph node cells by employing flow cytometry + Foxp3 + ) As shown in fig. 3A, the cells in the R3 region were a cd4+foxp3+ Treg cell population. The ratio of Treg cells to cd4+ T cells is shown in figure 3B. Compared with the control group, the level of Treg cells in mesenteric lymph node cells of the OVA group mice is obviously reduced by 0.5 times. All oligosaccharide groups showed a significant increase in Treg cell fraction compared to OVA group (p<0.01 The proportion of Treg cells in the SGMOs group was increased 3.8-fold, significantly higher than in the NGMOs group, the SBMOs group and the NBMOs group (p)<0.05). The research results show that the SGMOs have remarkable advantages in the aspects of inducing differentiation of Treg cells, inhibiting Th2 reaction, relieving food allergy symptoms induced by OVA and the like compared with neutral/acidic cow milk oligosaccharides and neutral goat milk oligosaccharides.
4. Effects of intestinal microorganisms in mice
As shown in fig. 4, by 16SrRNA sequencing, it was found that, at the portal level, the intestinal flora of OVA mice was significantly increased (p < 0.05) and the relative abundance of probiotics was significantly decreased (p < 0.05) compared to Control group (fig. 4A), and these results were consistent with literature reports. It was found that some strains of these symbiotic bacteria of the genus Bacteroidota and Proteobacteria are involved in the occurrence of intestinal inflammation. The relative abundance of intestinal flora was restored to normal levels after SGMOs treatment compared to OVA group, with the relative proportion of firmics significantly higher than that of Control group (p < 0.05). Firmics is the main bacterial gate of the intestinal tract of a healthy human body, and dietary fibers can increase the abundance of certain thick-walled bacteria in the intestinal tract and relieve related diseases by changing the intestinal permeability, inflammation, sugar metabolism, oxidation/synthesis of fatty acids, energy consumption and the like. At the family level, the relative abundance of the OVA group Lachnospiraceae and Oscillospiraceae beneficial bacteria was significantly reduced (p < 0.05), the relative abundance of the erysiplotrichaceae harmful bacteria and the Bacteroidaceae symbiotic bacteria was significantly increased (p < 0.05) compared to the control group (fig. 4B). OVA-induced changes in intestinal flora have been shown to be consistent with food allergy sufferers. The research shows that the reduction of Lachnospiraceae is related to allergic diseases of children, and pectin and tea polysaccharide can promote the proliferation of Lachnospiraceae and has the function of reducing intestinal inflammation. Oscillospiraceae can produce short chain fatty acids such as butyrate and propionate, stimulate goblet cells to increase and mucus expression, and maintain intestinal epithelial integrity, thereby reducing injury and inflammation of colon tissue. Studies have shown that oligosaccharides (FOS, FUC, GOS, HMOs) increase the abundance of Oscillospiraceae. Recently, it has been reported that Erysipelotorich acid has the activity of converting primary bile acid into secondary bile acid, affecting host metabolism and thus triggering intestinal inflammation. Compared with OVA group, SGMOs treated not only regulate the relative abundance of Lachnospiraceae, erysipelotrichaceae and Bactoidaceae to return to normal levels, but also promote proliferation of beneficial bacteria Lactobacillus, marinifilaceae and Clostridia eae, reducing the relative abundance of Desulfovinationaceae. Furthermore, intestinal flora significantly promoted the relative abundance of Prevotellaceae, marifilaceae and Lactobacillaceae (p < 0.05) compared to the control group, where Prevotellaceae and Lactobacillaceae were able to reduce the incidence of allergy in infants.
5. Influence of short chain fatty acids in mouse faeces
SCFA are the most abundant metabolites of the intestinal flora, they play a vital role as important nutrient sources for intestinal epithelial cells and have an impact on intestinal morphology and function. As shown in fig. 4, SCFA content in the cecal content was measured by GC (fig. 4C), and the concentrations of acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid and isovaleric acid were significantly reduced in OVA group compared to control group (p < 0.05). Compared with OVA group, SGMOs treated the concentration of acetic acid, propionic acid and isobutyric acid was significantly increased. Acetate, propionate and butyrate can improve the effect of allergic intestinal inflammation development, thereby helping to restore abnormal intestinal mucosa and barrier function.
6. Influence of the O-glycosylation level of colomucin
The intestinal mucosa is the biggest immune site of the organism, and as shown in fig. 5, comparing the colon mucin O-sugar chains of the mice in the Control group, the OVA group and the SGMOs group by qualitative and quantitative analysis, the colon mucin O-sugar chains of the mice in different groups are similar in species, but the glycosylation level is significantly different (fig. 5). Compared with the Control group, the total O-glycosylation level of the colon mucin of the OVA group mice is obviously reduced by 0.4 times (p is less than 0.05), wherein the expression quantity of the total neutral O-sugar chain is reduced by 0.7 times, and the expression quantity of the total acid O-sugar chain is reduced by 0.4 times; compared with OVA group, SGMOs group mice showed a significant increase in total O-glycosylation level by 0.7-fold (p < 0.05) (fig. 5A), wherein the expression level of total neutral O-sugar chains was significantly increased by 2.2-fold (p < 0.05) (fig. 5B), and the expression level of total acidic O-sugar chains was significantly increased by 0.6-fold (p < 0.05) (fig. 5C). It was found that differences in sialylation and fucosylation modified intestinal glycosylation levels correlated with the severity of inflammation. Neutral O-sugar chains can be classified into fucosylated and nonfucosylated, and the expression level of fucosylated O-sugar chains in the OVA group was significantly reduced by 0.8-fold (FIG. 5D) compared to that in the Control group, with no significant difference in the expression level of nonfucosylated O-sugar chains. Compared with the expression quantity of the fucosylation neutral O-sugar chains in the OVA group, the expression quantity of the O-sugar chains in the SGMOs treatment group is obviously improved by 3 times (p is less than 0.05). It was found that fucose at the end of the O-sugar chain of colistin can be utilized by the intestinal flora, affecting the expression of the metabolic pathways of the flora and reducing the expression of bacterial virulence genes. In addition, the fucose can inhibit the expression of colonitis related intestinal epithelial virulence genes. When intestinal fucosylation is absent, pathogenic bacteria increase, beneficial bacteria decrease, resulting in microbial translocation (microbialltransduction), disruption of the epithelial barrier and intestinal inflammation. The acidic sugar is modified by sialic acid, sulfated, sialic acid and sulfuric acid, compared with the Control group, the sialylated O-sugar chain expression level of the OVA group is reduced by 0.3 times (figure 5E), the sulfated O-sugar chain expression level is reduced by 0.4 times, and the O-sugar chain expression level of the sialic acid and sialic acid are modified together without obvious difference. The SGMOs treatment significantly increased the expression levels (p < 0.05) of sialylated O-sugar chains (0.7 fold) and sulfated O-sugar chains (0.5 fold), respectively, compared to the OVA group of acidic O-sugar chains. Studies have shown that mucin sulfation can enhance the mucous barrier and has the property of combating pathogenic infections and intestinal inflammation.
As shown in FIG. 6, the effect of SGMOs on each O-sugar chain of colistin was further analyzed, and it was found that the O-sugar chains of colistin were classified into two types of acidic (FIG. 6A) and neutral O-sugar chains (FIG. 6B). Compared to the Control group, the OVA group significantly reduced the 7 acid O-sugar chain levels, comprising 4 sulfation modifications (S1F 2H2N2, S1H1N1, S1F1H3N3 and S1H2N 2), 2 sialylation modifications (A1F 2H3N3 and A1F1H2N 2) and 1 sulfation and sialylation simultaneous modification O-sugar chain (S1 A1F1H2N 2), significantly increased the O-sugar chain level of glycoform composition A1H2N4 by a factor of 1.7; in addition, the level of neutral fucosylated O-sugar chains of 3 glycoforms consisting of F1H1N3, F1H2N2 and F2H2N2 was significantly reduced. Compared with the OVA group, the SGMOs group obviously increases the level of two acidic O-sugar chains with the glycoform composition of S1F2H2N2 (0.8 times) and A1F1H2N2 (1 times), obviously reduces the level of the O-sugar chains with the glycoform composition of A1H2N4 by 0.4 times, and shows that 3 acidic O-sugar chains with the glycoform composition of S1F2H2N2, A1F1H2N2 and A1H2N4 probably play a key role in restoring the expression of the colistin O-sugar chains by the SGMOs; in addition, the level of neutral O-sugar chains of the glycoform compositions F1H2N2, F2H2N3, F1H1N2 and F2H2N2 was significantly increased.
OVA sensitization results in a general decrease in the levels of mouse coliform mucin fucosylation, sialylation, and sulfated O-glycosylation, SGMOs treatment can significantly alter mucin O-sugar chain expression, restoring mouse coliform mucin fucosylation (F1H 2N2 and F2H2N 2), sialic acid, and sulfated (A1F 1H2N2 and S1F2H2N 2) O-sugar chain expression. Recovery of SGMOs from OVA-induced food-allergic intestinal mucosal lesions in mice was associated with significant changes in mucin O-glycoprotein.
7. Qualitative and quantitative analysis of acidic goat milk/cow milk oligosaccharide compositions
As shown in FIG. 7, the structure of SGMOs of example 1 and SBMOs sialylated oligosaccharides of comparative example 1 were analyzed using the "sugar cohort" analysis strategy developed in this laboratory (FIGS. 7A, 7B). Wherein, the goat milk has 24 sialylated sugar chains, 18 monosialates and 6 bissialates according to the number of sialic acid; cow milk has 10 sialylated sugar chains, 8 monosiales, and 2 bissialates. Compared with SGMOs, the number of SBMOs is reduced by 58%. According to the sialic acid structure classification, there are 12 kinds of sialylated sugar chains modified by Neu5Ac of SGMOs, 10 kinds of sialylated sugar chains modified by Neu5Gc, and 2 kinds of sialylated sugar chains modified by both Neu5Ac and Neu5 Gc; 8 sialylated sugar chains modified by Neu5Ac in SBMOs, and 2 sialylated sugar chains modified by Neu5 Gc; according to the sialic acid linkage mode, 11 kinds of alpha 2,3 linked sialic acid sugar chains in SGMOs, 10 kinds of alpha 2,6 linked sialic acid sugar chains, 3 kinds of alpha 2,3 and alpha 2,6 linked sialic acid sugar chains are classified; there are 6 kinds of α2, 3-linked sialyl sugar chains in SBMOs, 3 kinds of α2, 6-linked sialyl sugar chains, and 1 kind of α2, 3-linked sialyl sugar chains. As shown in fig. 7C, further quantitative comparative analysis was performed on acidic goat milk and acidic cow milk oligosaccharides, respectively, the relative proportion (95%) of the sialylated sugar chain content of the cow milk Neu5Ac modification was 1.8 times that of goat milk (52%), and the relative proportion (45%) of the sialylated sugar chain modified by goat milk Neu5Gc was 56 times that of cow milk (0.8%). In addition, the sialyl sugar chains (68%) linked to goat milk α2,6 were 1.9 times that of cow milk (36%), and the sialyl sugar chains (60%) linked to cow milk α2,3 were 2.1 times that of goat milk (28%). Thus, SBMOs are mainly composed of α2, 3-linked sialyl sugar chains, and SGMOs are mainly composed of α2, 6-linked sialyl sugar chains.
Compared with the prior art, the method has the following beneficial effects:
1. the acidic goat milk oligosaccharide composition is derived from goat milk, belongs to natural antiallergic substances, and has safety and effectiveness;
2. the acidic goat milk oligosaccharide composition provided by the invention maximally retains the antiallergic active ingredients in goat milk, and obtains excellent antiallergic performance;
3. the acidic goat milk oligosaccharide composition disclosed by the invention can relieve intestinal injury and inflammation, reduce sIgE, histamine, igG2a, IFN-gamma and IL-4 in serum, induce Treg cell differentiation to inhibit Th2 reaction, regulate the relative abundance of Lachnospiraceae, erysipelotrichaceae and Bactoidaceae to be recovered to a normal level, promote the proliferation of beneficial bacteria Lactobacillaceae, marinifilaceae and Clostridia acede, reduce the relative abundance of Desulfovineiganaceae, promote the relative abundance of Prevotellaceae, marinifilaceae and Lactobacteriaceae, improve the concentration of acetic acid, propionic acid and isobutyric acid in intestinal tracts, recover the expression of mucin O-sugar chains and realize an antiallergic function.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. Use of an acidic goat milk oligosaccharide composition for the preparation of an antiallergic drug or food, characterized in that the composition comprises 24 acidic sugar chains 24SMAOs, of which 24SMAOs, comprising 12 Neu5Ac modified sialylated sugar chains, 10 Neu5Gc modified sialylated sugar chains and 2 sialylated sugar chains having both Neu5Ac and Neu5Gc modifications, classified according to sialic acid linkage, comprising 11 α2,3 linked sialyl sugar chains, 10 α2,6 linked sialyl sugar chains and 3 sialyl sugar chains having both α2,3 and α2,6 linkages, classified according to sialic acid structure.
2. The use according to claim 1, wherein the content of 12 Neu5Ac modified sialylated sugar chains is 52%, the content of 10 Neu5Gc modified sialylated sugar chains is 45%, and the content of 2 sialylated sugar chains with both Neu5Ac and Neu5Gc modifications is 3%.
3. The use according to claim 1, wherein the 11 kinds of α2, 3-linked sialyl sugar chains have a content of 28%, the 10 kinds of α2, 6-linked sialyl sugar chains have a content of 68%, and the 3 kinds of α2, 3-and α2, 6-linked sialyl sugar chains have a content of 4%.
4. The use according to claim 1, wherein the composition alleviates intestinal damage and inflammation.
5. The use according to claim 1, wherein the composition reduces sIgE, histamine, igG2a, IFN- γ, IL-4 in serum.
6. The use of claim 1, wherein the composition induces differentiation of Treg cells.
7. The use according to claim 1, wherein the composition not only modulates the relative abundance of Lachnospiraceae, erysipelotrichaceae and Bacteroidaceae back to normal levels, but also promotes proliferation of beneficial bacteria Lactobacillaceae, marinifilaceae and clostridium acedeed, reduces the relative abundance of Desulfovibrionaceae, and promotes the relative abundance of Prevotellaceae, marinifilaceae and Lactobacillaceae.
8. The use according to claim 1, wherein the composition increases the concentration of acetic acid, propionic acid and isobutyric acid in the intestinal tract.
9. The use according to claim 1, wherein the composition restores the expression of the O-sugar chain of colistin.
10. The use according to claim 1, wherein the composition is prepared by the following method: taking a certain amount of sheep milk, thawing at normal temperature, and centrifuging to remove fat; adding ethanol with the volume of 2 times of the goat milk, fully and uniformly mixing, centrifuging, collecting supernatant, and freeze-concentrating and drying to obtain freeze-dried goat milk crude oligosaccharide; dissolving the freeze-dried crude goat milk oligosaccharide in double distilled water, slowly adding the double distilled water into a DEAE-52 cellulose chromatographic column, eluting neutral goat milk oligosaccharide by double distilled water, and continuously adding 0.25M NaCl solution to elute acidic goat milk oligosaccharide; washing the acidic goat milk oligosaccharide with graphite carbon column to remove salt, and obtaining the composition.
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