CN108939039B - Application of spirulina protein zymolyte and preparation method thereof - Google Patents

Application of spirulina protein zymolyte and preparation method thereof Download PDF

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CN108939039B
CN108939039B CN201810897805.9A CN201810897805A CN108939039B CN 108939039 B CN108939039 B CN 108939039B CN 201810897805 A CN201810897805 A CN 201810897805A CN 108939039 B CN108939039 B CN 108939039B
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艾立平
汪强强
胡丽莉
黄泽波
余程明
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Jiangxi Zaoquan Biotechnology Co ltd
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Abstract

The invention belongs to the technical field of medicines, and particularly relates to application of a spirulina protein zymolyte and a preparation method thereof. The spirulina protein zymolyte has high biological activity, can obviously delay senility, has obvious effect of inhibiting the aggregation of neurotoxic protein or relieving neurotoxicity, has certain relieving and treating effect on polyglutamine disease and alpha-synucleinopathy, can be used for preparing medicines, health-care products and cosmetics, and has wide application range.

Description

Application of spirulina protein zymolyte and preparation method thereof
Technical Field
The invention belongs to the technical field of medicines, and particularly relates to application of a spirulina protein zymolyte and a preparation method thereof.
Background
With the increasing aging of population, the pressure of aging and related diseases in the aging process on society is increasing, researchers are gradually aware that not only the life is prolonged, but also the related diseases in the aging process are prevented and treated, and the life quality of the old is improved, so that the prolonging of the health life becomes the key for researching the anti-aging field.
Polyglutamine (polyQ) diseases are common neurodegenerative diseases in the aging process, and the diseases are caused by the fact that the coding protein of the gene, namely polyQ protein, generates polyglutamine extension mutation due to CAG trinucleotide repeat extension mutation of the coding region of a pathogenic gene, wherein typical diseases comprise Huntington chorea (HD), bulbar spinal muscular atrophy (SBMA) and the like. Alpha-synucleinopathies are diseases with pathological features of alpha-synuclein, including Parkinson's disease, dementia with Lewy bodies, Alzheimer's disease with Lewy body variants, etc., and the common pathological feature is that alpha-synuclein selectively accumulates in vulnerable neurons and glial cells to form inclusion bodies. At present, the treatment means for the two types of neurological diseases are quite limited, only symptoms can be improved but the disease progress cannot be stopped, and the research progress of related treatment medicines is very slow.
Spirulina is a kind of lower prokaryote, is composed of single cells or multiple cells, contains rich active substances such as protein, trace elements, essential amino acids, essential fatty acids, carotenoids, vitamins and the like, has the functions of reducing cholesterol, regulating blood sugar, enhancing immune system, protecting intestines and stomach, resisting tumor and the like, and is widely applied to the research fields of food, medicines and the like at present. For example, chinese patent application CN101928743A discloses an enzymatic hydrolysate of phycocyanin of spirulina and its application, wherein the enzymatic hydrolysate is prepared by using trypsin, lichenibacillus protease, chymotrypsin, pepsin or their combination for enzymolysis, and can be applied to reduce the level of free radicals or enhance the individual antioxidant system. Chinese patent application CN106923337A discloses a preparation method and application of spirulina full-active substance, which adopts methods of solvent extraction with different polarities (from small to large), compound protease enzymolysis and the like to extract and prepare the spirulina full-active substance, and can be used for reducing blood sugar, blood fat and the like. The two patent applications carry out enzymolysis preparation on the spirulina, and the obtained product has good effects of resisting oxidation, reducing blood fat, reducing blood sugar and the like, but the application of spirulina zymolyte in the aspects of resisting aging, inhibiting neurotoxic protein aggregation, relieving neurotoxicity and the like is not mentioned.
Therefore, there is an urgent need to develop the use of spirulina protein zymolyte for delaying aging, inhibiting the aggregation of neurotoxic protein and relieving neurotoxicity and the preparation method thereof.
Disclosure of Invention
The invention aims to provide the application of spirulina protein zymolyte in delaying senility, inhibiting neurotoxic protein aggregation and relieving neurotoxicity and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
use of spirulina protein zymolyte in preparing medicine or health product for inhibiting neurotoxic protein aggregation or relieving neurotoxicity is provided.
Further, the neurotoxic protein includes polyQ protein and α -synuclein.
Furthermore, the medicine or health care product can relieve toxicity caused by aggregation of the A beta protein.
In addition, the invention also provides a polyQ protein aggregation inhibitor, which comprises effective amount of spirulina protein zymolyte.
In addition, the invention also provides an alpha-synuclein aggregation inhibitor, which comprises an effective amount of spirulina protein zymolyte.
In addition, the invention also provides an A beta protein toxicity relieving agent, which comprises effective amount of spirulina protein zymolyte.
In addition, the invention also provides the application of the spirulina protein zymolyte in preparing anti-aging medicaments, health-care products or cosmetics.
In addition, the invention also provides an anti-aging preparation which comprises effective amount of spirulina protein zymolyte.
In addition, the invention also provides an anti-aging cosmetic which contains spirulina protein zymolyte.
In addition, the invention also provides a preparation method of the spirulina protein zymolyte, which comprises the following steps:
s1, wall breaking: preparing suspension with the weight volume percentage of 8-12% by using Tris-HCl buffer solution, adjusting the pH to 7.0-7.5, soaking for 1-3 days, freezing at-20-40 ℃ for 12-24 h, then unfreezing at 4-25 ℃, repeatedly freezing and thawing for 3-5 times, and centrifuging at 5000-8000 rpm for 10-30 min to obtain supernatant;
s2, protein isolate: taking the supernatant obtained in the step S1, slowly adding NH4SO4 until the saturation degree is 50%, continuously stirring, standing overnight at 4 ℃, centrifuging at 5000-8000 rpm for 10-30 min, taking the precipitate to redissolve in primary water, placing in a dialysis belt of 3.5KDa, dialyzing for 2-3 d with flowing water, dialyzing for 3-5 times with deionized water, changing the deionized water every 12h, taking the dialyzed protein solution, and freeze-drying to obtain the spirulina protein extract;
s3, enzymolysis: dissolving the spirulina protein extract obtained in the step S2 in primary water to prepare a protein solution with the weight volume percentage of 15-30%, adjusting the pH to 7.0-8.0 by using 0.5mol/L NaOH solution, adding alkaline protease according to 4000-4500U/g, adjusting the temperature to 45-60 ℃, stirring and performing enzymolysis for 120-180 min, cooling to room temperature, adjusting the pH to 6.0-7.0 by using 1mol/L HCl, adding papain according to the weight percentage of 3.5-5.0% of enzyme and substrate, adjusting the temperature to 55-65 ℃, stirring and hydrolyzing for 180-250 min, placing in a constant-temperature water bath kettle at 95-100 ℃ for 10-15 min, cooling and freeze-drying to obtain the spirulina protein extract.
The application and the preparation method of the spirulina protein zymolyte of the invention lead the cell wall to be fully cracked by repeated freeze thawing and the cell content to be dissolved out; the ammonium sulfate precipitation method is adopted to carry out coarse separation on the protein, and dialysis is carried out to remove salt, so that the influence of impurities on the subsequent biological activity test is avoided; then, the obtained spirulina protein is subjected to stepwise enzymolysis by adopting a two-step enzymolysis method, so that the spirulina protein zymolyte with the effects of delaying senility, inhibiting neurotoxic protein aggregation and relieving neurotoxicity can be obtained. The experimental examples 1-3 show that the spirulina protein zymolyte can obviously improve the survival rate of the caenorhabditis elegans under natural conditions, heat shock conditions and oxidative stress conditions, and the experimental example 4 shows that the spirulina protein zymolyte prepared by the method can reduce the aggregation of caenorhabditis elegans lipofuscin and reduce the formation of color spots, which indicates that the spirulina protein zymolyte prepared by the method can effectively prolong the service life and delay aging; test example 5 shows that the spirulina protein zymolyte prepared by the invention can obviously inhibit the aggregation of polyQ protein and has certain relieving and treating effects on polyglutamine disease; the test example 6 shows that the spirulina protein zymolyte prepared by the invention can obviously inhibit the aggregation of alpha-synuclein, and the test example 7 shows that the spirulina protein zymolyte prepared by the invention can effectively relieve the neurotoxicity caused by the aggregation of Abeta protein, which indicates that the spirulina protein zymolyte prepared by the invention has certain relieving and treating effects on alpha-synucleinopathy, in particular to Alzheimer disease.
The invention has the following advantages:
(1) the spirulina protein zymolyte prepared by the preparation method of the spirulina protein zymolyte has high biological activity, can obviously delay senility, has obvious neuroprotective effect, has certain relieving and treating effect on polyglutamine disease and alpha-synucleinopathy, and can obviously improve the later life quality of the sick old.
(2) The preparation method of the spirulina protein zymolyte firstly breaks the wall, then separates the protein and then carries out enzymolysis, has simple steps and simple and convenient operation, is suitable for industrialized large-scale production, and the obtained product can be widely applied to the fields of medicines, foods and cosmetics and has wide application prospect.
Drawings
FIG. 1 is a graph showing the effect of spirulina protein zymolyte on the survival rate of caenorhabditis elegans under natural conditions.
FIG. 2 is a graph showing the effect of Spirulina protein zymolyte on the survival rate of C.elegans under heat shock conditions.
FIG. 3 is a graph showing the effect of Spirulina protein hydrolysate on the survival rate of C.elegans under oxidative stress.
FIG. 4 is a graph showing the effect of Spirulina protein hydrolysate on the accumulation of lipofuscin in C.elegans.
FIG. 5 is a graph showing the effect of Spirulina protein hydrolysate on polyQ protein aggregation in transgenic nematode AM 141.
FIG. 6 is a graph of the effect of Spirulina protein zymolyte on alpha-synuclein aggregation in transgenic nematode NL 5901.
FIG. 7 is a graph of the effect of Spirulina protein zymolyte on chemotactic capacity of transgenic nematode CL 2355.
Detailed Description
The present invention will be described in further detail with reference to the following examples. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following examples.
Wherein, the spirulina powder is purchased from biological development industry limited company of Qingyi spirulina in Yunnan, Escherichia coli NA22 and caenorhabditis elegans (including wild type and transgenic type) are purchased from the genetic information collection center of caenorhabditis elegans of Minnesota university, and other reagents are common reagents and can be purchased from conventional reagent production enterprises.
S basic solution: weighing 5.8g NaCl, 1.3g K2HPO4·3H2O and 6.0g KH2PO4And (3) placing the mixture into a reagent bottle, adding 750ml of deionized water, fully dissolving, then fixing the volume to 1L, sterilizing for 30min, and cooling to 40-50 ℃ for later use.
S Medium solution: adding 1L sterilized S Basal solution dropwise into 1ml cholesterol ethanol solution with concentration of 5.0mg/ml, shaking while adding to dissolve completely (the solution changes from colorless transparency to microemulsion transparency without obvious precipitation), and sequentially adding 3ml CaCl with concentration of 1mol/L2Solution, 3ml MgSO 1mol/L MgSO4The solution, 10ml of potassium citrate solution (pH 6.0) with the concentration of 1mol/L and 10ml of trace element solution are mixed evenly and placed at normal temperature for standby.
EXAMPLE 1A Spirulina protein hydrolysate (SPPH)
Is prepared by the following steps:
s1, wall breaking: preparing 10% suspension of blunt-topped spirulina powder by Tris-HCl buffer solution, adjusting pH to 7.4, soaking for 1 day, freezing at-20 deg.C for 12h, thawing at 4 deg.C, repeatedly freezing and thawing for 3 times, and centrifuging at 5000rpm for 30min to obtain supernatant;
s2, protein isolate: taking the supernatant obtained in the step S1, and slowly adding NH4SO4To saturation thereofKeeping the temperature at 50%, continuously stirring, standing at 4 deg.C overnight, centrifuging at 5000rpm for 30min, re-dissolving the precipitate in first-stage water, placing in 3.5KDa dialysis belt, dialyzing with flowing water for 3d, dialyzing with deionized water for 3 times, changing deionized water every 12 hr, and lyophilizing the dialyzed protein solution to obtain Spirulina protein extract;
s3, enzymolysis: dissolving the spirulina protein extract obtained in the step S2 in primary water to prepare a protein solution with the weight volume percentage of 20%, adjusting the pH to 7.0 by using 0.5mol/L NaOH solution, adding alkaline protease according to 4300U/g, adjusting the temperature to 55 ℃, stirring for enzymolysis for 160min, cooling to room temperature, adjusting the pH to 6.5 by using 1mol/L HCl, adding papain according to 4.5% of the weight percentage of the enzyme and the substrate, adjusting the temperature to 60 ℃, stirring for hydrolysis for 210min, placing in a constant-temperature water bath kettle at 99 ℃ for 10min, cooling and freeze-drying to obtain the spirulina protein extract.
Example 2A Spirulina protein zymolyte (SPPH)
Is prepared by the following steps:
s1, wall breaking: preparing 12% suspension of blunt-topped spirulina powder by Tris-HCl buffer solution, adjusting pH to 7.5, soaking for 2 days, freezing at-20 deg.C for 24h, thawing at 4 deg.C, repeatedly freezing and thawing for 4 times, and centrifuging at 6000rpm for 10min to obtain supernatant;
s2, protein isolate: taking the supernatant obtained in the step S1, and slowly adding NH4SO4Continuously stirring until the saturation degree is 50%, standing at 4 ℃ overnight, centrifuging at 6000rpm for 10min, taking the precipitate to redissolve in primary water, placing in a dialysis belt of 3.5KDa, dialyzing with flowing water for 3d, dialyzing with deionized water for 4 times, changing the deionized water every 12h, taking the dialyzed protein solution, and freeze-drying to obtain the spirulina protein extract;
s3, enzymolysis: dissolving the spirulina protein extract obtained in the step S2 in primary water to prepare a protein solution with the weight volume percentage of 25%, adjusting the pH to 7.5 by using 0.5mol/L NaOH solution, adding alkaline protease according to 4500U/g, adjusting the temperature to 55 ℃, stirring for enzymolysis for 180min, cooling to room temperature, adjusting the pH to 6.5 by using 1mol/L HCl, adding papain according to the weight percentage of 4.8% of enzyme and substrate, adjusting the temperature to 63 ℃, stirring for hydrolysis for 200min, placing in a constant-temperature water bath kettle at 100 ℃ for 10min, cooling and freeze-drying to obtain the spirulina protein extract.
EXAMPLE 3A Spirulina protein hydrolysate (SPPH)
Is prepared by the following steps:
s1, wall breaking: preparing suspension with weight volume percentage of 8% from Spirulina platensis powder with Tris-HCl buffer solution, adjusting pH to 7.3, soaking for 2 days, freezing at-20 deg.C for 18h, thawing at 25 deg.C, repeatedly freezing and thawing for 5 times, and centrifuging at 8000rpm for 10min to obtain supernatant;
s2, protein isolate: taking the supernatant obtained in the step S1, and slowly adding NH4SO4Continuously stirring until the saturation degree is 50%, standing at 4 deg.C overnight, centrifuging at 8000rpm for 10min, re-dissolving the precipitate in first-stage water, placing in 3.5KDa dialysis belt, dialyzing with flowing water for 3d, dialyzing with deionized water for 5 times, changing deionized water every 12 hr, and lyophilizing the dialyzed protein solution to obtain Spirulina protein extract;
s3, enzymolysis: dissolving the spirulina protein extract obtained in the step S2 in primary water to prepare a protein solution with the weight volume percentage of 20%, adjusting the pH to 7.5 by using 0.5mol/L NaOH solution, adding alkaline protease according to 4000U/g, adjusting the temperature to 52 ℃, stirring for enzymolysis for 170min, cooling to room temperature, adjusting the pH to 6.5 by using 1mol/L HCl, adding papain according to the weight percentage of 4.2% of the enzyme and the substrate, adjusting the temperature to 62 ℃, stirring for hydrolysis for 240min, placing in a constant-temperature water bath kettle at 98 ℃ for 15min, cooling and freeze-drying to obtain the spirulina protein extract.
Test example 1 Effect of Spirulina protein zymolyte on the Life of caenorhabditis elegans under Natural conditions
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: wild type C.elegans (N2).
3. The test method comprises the following steps:
transferring the caenorhabditis elegans in the L4 stage into a 1.5ml sterile EP tube, washing for 3 times by using S Medium, removing eggs and nematode fragments which do not hatch, adjusting the density to 20 strips/10 muL by using S Medium solution, shaking uniformly, adding 10 muL caenorhabditis elegans solution into each hole, adding spirulina protein zymolyte dissolved in the S Medium solution to enable the final concentration to be 2mg/ml (adding equal volume of S Medium solution into a control group), then adding ampicillin with the final concentration of 100 mug/ml and 5-fluorouracil deoxynucleoside (5-FUDR) with the final concentration of 75 mug/ml, finally complementing the S Medium containing NA22 bacteria liquid to 100 muL, placing the solution in a shaking table for culturing at 20 ℃, and counting the survival ratio of the caenorhabditis elegans every 12 hours until all the caenorhabditis elegans are dead.
4. And (3) test results:
the survival rate of C.elegans is shown as a survival curve and the results are analyzed by the Kaplan-Meier method, as shown in FIG. 1. As can be seen from FIG. 1, the spirulina protein zymolyte can prolong the life of caenorhabditis elegans under natural conditions, which shows that the spirulina protein zymolyte provided by the invention has the function of delaying senility.
Test example 2 Effect of Spirulina protein hydrolysate on survival Rate of caenorhabditis elegans under Heat shock conditions
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: wild type C.elegans (N2).
3. The test method comprises the following steps:
transferring the caenorhabditis elegans in the L4 stage into a 1.5ml sterile EP tube, washing for 3 times by using S Medium, removing eggs and nematode fragments which do not hatch, adjusting the density to 20 strips/10 muL by using S Medium solution, adding 10 muL of caenorhabditis elegans solution into each hole after shaking uniformly, adding spirulina protein zymolyte dissolved in the S Medium solution to enable the final concentration to be 2mg/ml (adding equal-volume S Medium solution into a control group), then adding ampicillin with the final concentration of 100 mug/ml and 5-fluorouracil deoxynucleoside (5-FUDR) with the final concentration of 75 mug/ml, finally complementing the S Medium with NA22 to 100 muL, placing the plate into a 20 ℃ shaking table for culturing for 48h, placing the plate into a 35 ℃ heat shock for 6h, placing the plate into a 20 ℃ for incubation for 15h, and counting the survival rate of the caenorhabditis elegans.
4. And (3) test results:
as can be seen from FIG. 2, compared with the control group, the spirulina protein zymolyte can significantly improve the survival rate of the caenorhabditis elegans under heat stress, which shows that the spirulina protein zymolyte prepared by the invention can significantly enhance the heat stress resistance of the caenorhabditis elegans.
Test example 3 Effect of Spirulina protein hydrolysate on survival Rate of caenorhabditis elegans under oxidative stress
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: wild type C.elegans (N2).
3. The test method comprises the following steps:
transferring the caenorhabditis elegans in L4 stage into a 1.5ml sterile EP tube, washing for 3 times by using S Medium, removing eggs and nematode fragments which do not hatch, adjusting the density to 20 strips/10 muL by using S Medium solution, shaking uniformly, adding 10 muL caenorhabditis elegans solution into each hole, adding spirulina protein zymolyte dissolved in the S Medium solution to enable the final concentration to be 2mg/ml (adding equal-volume S Medium solution into a control group), adding ampicillin with the final concentration of 100 mug/ml and 5-fluorouracil deoxynucleoside (5-FUDR) with the final concentration of 75 mug/ml, finally complementing the S Medium containing NA22 to 100 muL, placing in a shaking table at 20 ℃ for 24h, adding white hay with the final concentration of 50mmol/L to perform oxidative stress molding, and counting the survival ratio of the caenorhabditis elegans every 12h, until all of them die.
4. And (3) test results:
the survival rate of C.elegans was expressed as a survival curve, and the results were analyzed by the Kaplan-Meier method. As can be seen from FIG. 3, the spirulina protein zymolyte can significantly improve the survival rate of caenorhabditis elegans under oxidative stress, which shows that the spirulina protein zymolyte prepared by the invention can enhance the oxidation resistance of the caenorhabditis elegans and relieve the damage caused by oxidative stress.
Test example 4 Effect of Spirulina protein hydrolysate on the aggregation of lipofuscin in C.elegans
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: wild type C.elegans (N2).
3. The test method comprises the following steps:
transferring the C.elegans of L4 stage into a 1.5ml sterile EP tube, washing with S Medium for 3 times to remove eggs and nematode debris that do not hatch, adjusting the density to 20 strips/10 μ L with S Medium solution, shaking, adding 10 μ L of C.elegans solution into each well, adding Spirulina protein zymolyte dissolved in S Medium solution to make the final concentration to be 2mg/ml (adding equal volume of S Medium solution into control group), then adding ampicillin with a final concentration of 100. mu.g/ml and 5-fluorouracil deoxynucleoside (5-FUDR) with a final concentration of 75. mu.g/ml, finally complementing S Medium containing NA22 bacterial solution to 100. mu.l, placing the mixture in a shaking table for 10d at 20 ℃, collecting caenorhabditis elegans, washing the caenorhabditis elegans with M9 buffer solution for 3 times, transferring the washed solution to a 2% agarose gel sheet, and dripping 10. mu.l NaN with a concentration of 100 mmol/L.3And (3) anaesthetizing the caenorhabditis elegans, setting the excitation wavelength to be 355nm and the emission wavelength to be 460nm, photographing by using a fluorescence microscope, analyzing pictures by using Image J software, and calculating the fluorescence density of each group.
4. And (3) test results:
as can be seen from FIG. 4, the fluorescence intensity in the caenorhabditis elegans added with the spirulina protein zymolyte is obviously lower than that of the contrast group, which shows that the spirulina protein zymolyte prepared by the invention can reduce the aggregation of caenorhabditis elegans lipofuscin, reduce the formation of color spots and delay senility.
Test example 5 Effect of Spirulina protein hydrolysate on aggregation of polyQ protein of Huntington's disease model (AM141)
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: the transgenic nematode strain AM141 can express polyQ40 YFP fusion protein, and the polyQ protein is continuously aggregated from the hatching to the adult growth stage, namely, the yellow-green fluorescence spots are continuously increased along with the aging of the nematode, so that the transgenic nematode strain AM141 can be applied to the research of related pathways of polyQ toxicity, and is a common disease model for researching HD.
3. The test method comprises the following steps:
taking the synchronized L1 stage transgenic nematodeAdding strain AM141 into a 24-well plate, adding about 500 strains of spirulina protein zymolyte and NA22 bacterial liquid into each well, shaking, placing at 20 ℃ for shake culture, collecting transgenic nematodes in an EP tube every 24h, washing for 3 times by using M9 buffer solution, dripping the collected transgenic nematodes on a 2% agarose pad, and dripping 10 mu L of NaN with the concentration of 100mmol/L3Anaesthetizing the transgenic nematodes, setting an excitation wavelength of 485nm and an emission wavelength of 538nm, observing by a fluorescence microscope, and counting yellow-green fluorescence accumulation points of each transgenic nematode in each group (about 20 transgenic nematodes).
4. And (3) test results:
as can be seen from FIG. 5, the fluorescence aggregation amount of the transgenic nematodes in the spirulina protein zymolyte group is less than that in the control group within 3 days, wherein the fluorescence point aggregation amount of the transgenic nematodes treated by the spirulina protein zymolyte on the 3 rd day is obviously reduced compared with that in the control group, and the result shows that the spirulina protein zymolyte prepared by the invention can obviously inhibit the aggregation of polyQ protein and has certain relieving and treating effects on polyglutamine diseases.
Test example 6 Effect of Spirulina protein zymolyte on aggregation of α -synuclein in the Parkinson model (NL5901)
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: the transgenic nematode strain NL5901 is a transgenic nematode strain expressing human alpha-synuclein marked by green fluorescent protein in body wall muscle cells, and along with the aging, the more alpha-synuclein is expressed, the stronger green fluorescence is, and the transgenic nematode strain is a nematode model commonly used for researching PD.
3. The test method comprises the following steps:
adding synchronized L1-stage transgenic nematode NL5901 into 24-well plate, adding about 500 strains per well, adding spirulina protein zymolyte and NA22 bacterial liquid, shaking, culturing at 20 deg.C for 72h, collecting transgenic nematodes in EP tube, washing with M9 buffer solution for 3 times, dropping the transgenic nematodes on 2% agarose pad, and dropping 10 μ L NaN with concentration of 100mmol/L3Anaesthetizing caenorhabditis elegans, setting excitation wavelength to be 485nm and emission wavelength to be 538nAnd m, observing through a fluorescence microscope, and analyzing and counting the fluorescence density of each nematode by using Image J software.
4. And (3) test results:
as can be seen from FIG. 6, the fluorescence intensity of the fluorescent protein expressed by the transgenic nematodes treated with the spirulina protein zymolyte is significantly lower than that of the control group, which indicates that the spirulina protein zymolyte prepared by the invention can significantly inhibit the aggregation of alpha-synuclein and has certain relieving and treating effects on alpha-synucleinopathy.
Test example 7 Effect of Spirulina protein hydrolysate on chemotactic ability of Alzheimer's disease model (CL2355)
1. Test materials: the spirulina protein hydrolysate (SPPH) prepared in example 1 of the present invention.
2. Test subjects: the transgenic nematode strain CL2355 can induce and express Abeta protein at high temperature, is an important substance causing Alzheimer disease, can cause nerve damage, has reduced sensitivity to chemical substances (cANP, benzaldehyde, diacetyl and the like), and can judge whether a sample can relieve neurotoxicity generated by Abeta aggregation or not by detecting chemotactic capacity of the heat-shocked transgenic nematodes.
3. The test method comprises the following steps:
taking synchronized eggs of a transgenic nematode strain CL2355, performing shake cultivation at 15 ℃ for 23 hours, adjusting the density of the nematode, equivalently adding the eggs into a 24-hole plate, wherein each hole is about 500, then adding spirulina protein zymolyte and NA22 bacterial liquid, shaking, then placing at 15 ℃ for cultivation for 36 hours, then raising the temperature to 23 ℃ for continuous cultivation for 36 hours, collecting the transgenic nematodes in an EP (Ephedra) tube, washing 3 times by using M9 buffer solution, transferring the transgenic nematodes to the center of a 9cm chemotaxis flat plate, respectively dripping attractant benzaldehyde (A) and absolute ethyl alcohol (B) at positions 1cm away from the edge of the two sides of the flat plate, performing cultivation for 1 hour at 23 ℃, taking out, heating in a 50 ℃ oven for 15min for killing, and counting the condition of the transgenic nematodes induced by the benzaldehyde under a microscope.
The chemotaxis index CI ═ number (A) -number (B))/(number (A) + number (B)).
4. And (3) test results:
as can be seen from fig. 7, the chemotactic index of the transgenic nematodes after the treatment of the spirulina protease prepared in example 1 of the present invention is significantly higher than that of the control group, which indicates that the spirulina protease prepared in the present invention can effectively alleviate neurotoxicity caused by aggregation of a β protein, and has certain effects of alleviating and treating alzheimer's disease.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (2)

1. Use of a spirulina protein hydrolysate for the preparation of a medicament for inhibiting aggregation of neurotoxic proteins or alleviating neurotoxicity;
the neurotoxic protein includes polyQ protein and alpha-synuclein;
the neurotoxicity is caused by aggregation of A beta protein;
the preparation method of the spirulina protein zymolyte comprises the following steps:
s1, wall breaking: preparing suspension with the weight volume percentage of 8-12% by using Tris-HCl buffer solution, adjusting the pH to 7.0-7.5, soaking for 1-3 days, freezing at-20-40 ℃ for 12-24 h, then unfreezing at 4-25 ℃, repeatedly freezing and thawing for 3-5 times, and centrifuging at 5000-8000 rpm for 10-30 min to obtain supernatant;
s2, protein isolate: taking the supernatant obtained in the step S1, and slowly adding NH4SO4Continuously stirring until the saturation degree is 50%, standing overnight at 4 ℃, centrifuging at 5000-8000 rpm for 10-30 min, re-dissolving the precipitate in primary water, placing the primary water in a dialysis belt of 3.5KDa, dialyzing with flowing water for 2-3 d, dialyzing with deionized water for 3-5 times, changing the deionized water every 12h, and freeze-drying the dialyzed protein solution to obtain a spirulina protein extract;
s3, enzymolysis: dissolving the spirulina protein extract obtained in the step S2 in primary water to prepare a protein solution with the weight volume percentage of 15-30%, adjusting the pH to 7.0-8.0 by using 0.5mol/L NaOH solution, adding alkaline protease according to 4000-4500U/g, adjusting the temperature to 45-60 ℃, stirring and performing enzymolysis for 120-180 min, cooling to room temperature, adjusting the pH to 6.0-7.0 by using 1mol/L HCl, adding papain according to the weight percentage of 3.5-5.0% of enzyme and substrate, adjusting the temperature to 55-65 ℃, stirring and hydrolyzing for 180-250 min, placing in a constant-temperature water bath kettle at 95-100 ℃ for 10-15 min, cooling and freeze-drying to obtain the spirulina protein extract.
2. The use of claim 1, wherein said medicament mitigates toxicity associated with aggregation of a β protein.
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