Summary of the invention
Technical problem to be solved by this invention is to provide a kind of inflammatory reaction that LPS is caused and has preparation method and the anti-inflammatory activity application thereof of the functional Lactobacterium acidophilum peptidoglycan that presses down preferably scorching regulatory function.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of preparation method of functional Lactobacterium acidophilum peptidoglycan, specifically comprises the following steps: by the Lactobacterium acidophilum in source, ocean (
lactobacillus acidophilus) preserving number is CGMCC No.8920, the by volume inoculum size of per-cent 2.0-4.0%, be seeded on MRS substratum, at 37 DEG C, anaerobism is cultivated after 18-24h, in the centrifugal 15-20min of 4000-8000g, remove thalline fermented liquid, then precipitation being added to massfraction in thalline is 4% SDS solution, and Pintsch process 30min at 100 DEG C, removes protein ingredient; Taking precipitate, in throw out, adding massfraction is 10% trichoroacetic acid(TCA) solution, removes teichoic acid; Taking precipitate, after 4 DEG C of dialyzed overnight desalinations, after-80 DEG C of pre-freeze 6h, puts into rapidly vacuum freeze in 80-120Pa drying treatment 24h by throw out by throw out, and the powder obtaining is Lactobacterium acidophilum peptidoglycan.
The ratio of described precipitation thalline and described SDS solution is 1g:100ml, and the ratio of described precipitation thalline and described trichoroacetic acid(TCA) solution is 1g:100ml.
The anti-inflammatory activity application of above-mentioned functions Lactobacterium acidophilum peptidoglycan, but the inflammatory reaction that this functional Lactobacterium acidophilum peptidoglycan causes e. coli lipopolysaccharide (LPS) has preferably scorching regulatory function, be that Lactobacterium acidophilum peptidoglycan is inhibited to iNOS and COX-2 protein expression, on Raw264.7 scavenger cell model, effectively pressing down scorching concentration is 100-200 μ g/mL.
This functional Lactobacterium acidophilum peptidoglycan finds through immunity section, and this functional Lactobacterium acidophilum peptidoglycan effectively reduces the expression amount of iNOS small intestine intestines parietal cell, on mouse model effectively to press down scorching dosage be 100mg/kg/d.
Compared with prior art, the invention has the advantages that:
The preparation method of a kind of functional Lactobacterium acidophilum peptidoglycan of the present invention and anti-inflammatory activity application thereof, prove that first this Lactobacterium acidophilum peptidoglycan exists the inflammatory reaction that reduction e. coli lipopolysaccharide causes, for milk-acid bacteria regulating intestinal canal immunocompetence, the release of the regulation and control related immune factor carrys out stimulating immune system and brings into play that it is anti-infective, and the exploitation milk-acid bacteria new type of health factor, functional foodstuff or medicine provide theoretical foundation.
Lactobacterium acidophilum (
lactobacillus acidophilus), bacterial strain is WZ-D1, and preserving number is CGMCC No.8920, is deposited in China Committee for Culture Collection of Microorganisms's common micro-organisms center on 03 14th, 2014, preservation address is No. 3, Yard 1, BeiChen xi Road, Chaoyang District, Beijing City, Institute of Microorganism, Academia Sinica.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
Specific embodiment 1
The preparation of Lactobacterium acidophilum peptidoglycan
By the Lactobacterium acidophilum in source, ocean (
lactobacillus acidophilus) preserving number is the by volume inoculum size of per-cent 2.0-4.0% of CGMCC No.8920, be seeded on MRS substratum, at 37 DEG C, anaerobism is cultivated after 18-24h, in the centrifugal 15-20min of 4000-8000g, remove thalline fermented liquid, then getting precipitation thalline 1g, to add massfraction be 4% SDS solution, at 100 DEG C, Pintsch process 30min, removes protein ingredient; Taking precipitate, in throw out, adding massfraction is 10% trichoroacetic acid(TCA) solution, removes teichoic acid; Taking precipitate, after 4 DEG C of dialyzed overnight desalinations, after-80 DEG C of pre-freeze 6h, puts into rapidly vacuum freeze in 80-120Pa drying treatment 24h by throw out by throw out, and the powder obtaining is Lactobacterium acidophilum peptidoglycan.Sample is stored in-40 DEG C of refrigerators with for subsequent use.Wherein Fig. 1 is Lactobacterium acidophilum thalline scanning electron microscope (SEM) photograph, and Fig. 2 is the Lactobacterium acidophilum peptidoglycan scanning electron microscope (SEM) photograph of preparation.Lactobacterium acidophilum peptidoglycan is compared Lactobacterium acidophilum significant difference, and the form of ellipse bar is destroyed, and Fig. 2 is the peptidoglycan composition extracting.
The extraction yield of peptidoglycan calculates by following formula, and the peptidoglycan extraction yield that this example obtains is 26.5%.
Extraction yield (%)=(peptidoglycan dry weight/dry cell weight) × 100
The purity of peptidoglycan is by HPLC method validation, Agilent Agilent 1200 Infinity equipment, the Aminex HPX-87H sugar post (300 × 7.8 mm) of Bole company, sample size 20ul, sample introduction concentration 1mg/ml, 37 DEG C of column temperatures, elutriant is 5 mM sulphuric acid solns, flow velocity 0.5 ml/min, time 20min, detection method 225 nm ultraviolet spectrometries.As shown in Figure 3, the HPLC appearance time that derives from lactobacillus acidophilus cells's wall peptidoglycan is 7.618min to result.The peptidoglycan purity that this example obtains is 99.9%.
Purity (%)=(peptidoglycan go out peak area/detection sample always go out peak area) × 100
Above-mentioned Lactobacterium acidophilum (
lactobacillus acidophilus), bacterial strain is WZ-D1, and preserving number is CGMCC No.8920, is deposited in China Committee for Culture Collection of Microorganisms's common micro-organisms center on 03 14th, 2014, preservation address is No. 3, Yard 1, BeiChen xi Road, Chaoyang District, Beijing City, Institute of Microorganism, Academia Sinica.
Specific embodiment 2
The Lactobacterium acidophilum peptidoglycan that above-described embodiment 1 is prepared carries out mass spectrum (MALDI-TOF/TOF MS) and detects analysis; Lactobacterium acidophilum peptidoglycan powder carries out amino acid analysis and infrared (RI) detects.
1, the molecular weight of peptidoglycan and substructure
The Lactobacterium acidophilum peptidoglycan solution that is 1mg/ml by 1 microlitre concentration mixes with the DHB of 1 microlitre 50 mg/ml, after mixing, gets 1 microlitre mixed solution loading, carries out mass spectroscopy.Instrument model FLEX-PC, type is ultraflex TOF/TOF.The molecular weight of the detected peptidoglycan of this scheme is 875.260 Da, makes a concrete analysis of as shown in table 1 below.
Table 1 peptidoglycan ion fragment table
2, analysis of amino acids
Utilize A200 Amino Nova amino acidanalyser, analyze the amino acid whose composition of peptidoglycan and relative content height, thereby confirm amino acid whose composition in peptidoglycan.Concrete steps are as follows: 10mg peptidoglycan is hydrolyzed to 24h with the hydrochloric acid of 6M at 110 DEG C, and the product after hydrolysis is analyzed amino acid composition and the relative content in hydrolyzate through amino acidanalyser again.Result is as shown in table 2,
The relative content of main amino acid (concentration >=80 mg/g) in table 2 peptidoglycan
3, the characteristic group in Infrared spectrum scanning peptidoglycan sample
Peptidoglycan powdered sample is placed in to agate mortar even with KBr powder mixed grinding, is pressed into thin slice through tabletting machine, at wave number 4,000-400cm
-1carry out Infrared spectrum scanning, to determine characteristic group.Infrared scan spectrogram as shown in Figure 4,1070 cm
-1, there is C-O-C glycosidic link absorption peak in point bands of a spectrum region.1650 cm
-1, there is C=O stretching vibration, the superposition peak of carbonyl peak and COC in point bands of a spectrum region; 1540 cm
-1there are N-H flexural vibration in point bands of a spectrum region, amino peak (protonated amino) shows to exist in peptidoglycan amido linkage (peptide bond) functional group.Comprehensive above detection method, show that the structural models of Lactobacterium acidophilum muramyl peptide glycan is as follows,
。
Specific embodiment 3
The anti-inflammatory activity analysis of Lactobacterium acidophilum peptidoglycan prepared by above-described embodiment 1
(1) utilize the inflammatory model of the scavenger cell Raw 264.7 of Lactobacterium acidophilum peptidoglycan to LPS induction to regulate active, analyze iNOS in end product and the expression amount of COX-2 and change, analyze peptidoglycan and whether there is good inhibition Inflammatory substances and discharge active.
Six orifice plates are cultivated Raw 264.7 cells, and normal group is that adherent rate reaches the normal scavenger cell RAW264.7 of 60-80% cell, continue to extract cytoplasm protein after cultivation 18 h; LPS stimulating group is that in adherent rate reaches RAW 264.7 scavenger cells of 60-80%, to add final concentration be that the LPS of 100ng/ml induces, and extracts cytoplasm protein after continuing to cultivate 18 h; Peptidoglycan reparation group is that adherent rate reaches that in the scavenger cell of 60-80%, to add final concentration be the peptidoglycan that the LPS of 100ng/ml and final concentration are followed successively by the concentration gradient of 25 μ g/ml, 50 μ g/ml, 100 μ g/ml, 200 μ g/ml simultaneously, extracts cytoplasm protein after continuing to cultivate 18 h.
The albumen of different groups is carried out to protein immunoblotting analysis (Western Blot), target protein iNOS and COX-2 expressing quantity are analyzed.The restraining effect result of the RAW264.7 scavenger cell inflammatory factor of Lactobacterium acidophilum peptidoglycan to LPS induction as shown in Figure 5, for the cell that produces inflammatory reaction, the expression amount of its iNOS and COX-2 can be far away higher than blank group (left side first row in diagram), and the inflammatory model of finding its scavenger cell Raw 264.7 to LPS induction in peptidoglycan treatment group has significant adjusting activity, its activity is when PNG concentration is during at 100-200 μ g/ml, the significantly expression of inflammation-inhibiting factor iNOS and COX-2.Wherein glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is house keeping protein, and the expression amount in all cells is stable, uses as internal reference.
(2) ICR mouse experiment
60 suckling mouses of 25-28g ICR mouse (each 30 of male and female) are selected in experiment, are divided into 4 groups: Normal group, pathogenic colon bacillus infected group, peptidoglycan treatment group, 15 every group.Raise after 5 days, every of infected group gavages 0.50mL pathogenic colon bacillus liquid (5 × 10 with the syringe per os of improveing
8cFU/ml); Treatment group gavages 0.50mL pathogenic colon bacillus liquid (5 × 10 on the 5th day
8cFU/ml), after 1h, gavage Lactobacterium acidophilum peptidoglycan suspension liquid with the dosage of 100mg/kg/d, play the peptidoglycan that gavages same dose every day next day; Normal control is raised after 5 days and is gavaged 0.50mL physiological saline.After 25 days, mouse is implemented to euthanasia, the immunity section of carrying out intestinal cell detects the expression amount of iNOS in different groups.As shown in Figure 6, shown spot in figure, is the inflammatory factor iNOS that confirms by the immunization method expression amount in mouse intestinal cell to result, and in the mouse intestinal cell of gavage peptidoglycan, the expression amount of iNOS is starkly lower than pathogenic colon bacillus treatment group.Visible, also absolutely prove by mouse experiment the effect that peptidoglycan plays in enteron aisle anti-inflammatory.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited to above-mentioned giving an example.Variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present invention, also should belong to protection domain of the present invention.