CN111534487B - Promoter for promoting osteogenic differentiation of mesenchymal stem cells - Google Patents
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Abstract
The invention belongs to the technical field of stem cells, and particularly relates to an accelerant for promoting osteogenic differentiation of mesenchymal stem cells. According to the invention, the expression of mRNA level and protein level of genes ALP, BGLAP and RUNX2 related to osteogenic differentiation of bone marrow mesenchymal stem cells can be remarkably promoted by mud snail polypeptide through a fluorescence quantitative PCR experiment, a Western Blot experiment and an alizarin red staining experiment, and the mineralization level of the bone marrow mesenchymal stem cells can be remarkably promoted, so that the mud snail polypeptide can be used as a promoter for osteogenic differentiation of the mesenchymal stem cells to promote osteogenic differentiation of the mesenchymal stem cells, and more osteoblasts can be provided for treating diseases such as osteoporosis and bone injury.
Description
Technical Field
The invention belongs to the technical field of stem cells, and particularly relates to an accelerant for promoting osteogenic differentiation of mesenchymal stem cells.
Background
In the clinical treatment work of bone injury, the treatment and prevention of massive bone defect, postoperative nonunion and osteoporosis become the problems to be solved urgently in orthopedics. The traditional bone grafting operation has large damage and limited bone mass, needs a safe and effective method with small wound to replace the traditional bone grafting operation, the prior tissue engineering technology becomes an important method for solving the problems of bone nonunion and bone defect, and the enhancement of bone formation is an important strategy for effectively treating bone injury.
The bone marrow mesenchymal stem cells are primitive cells with self-renewal and multidirectional differentiation potential, and are the main sources of osteoblasts in vivo. The proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells have important significance for maintaining the number of osteoblasts. At present, the problem of osteoblast insufficiency is often faced by tissue engineering technology, so that the problem to be solved is to find a new substance capable of storing bone-forming differentiation of bone marrow mesenchymal stem cells.
Since marine organisms have a large number of resources and strong regeneration capacity, marine organisms become an important source of active peptides. The marine organisms have unique physiological characters due to different living environments, so that a plurality of substances with special biological activity exist, and the marine organisms have great development potential.
Mud snail belongs to mollusca and mud snail, which is a special product of seawater and salt fresh water in the western pacific region. China produces bullacta exarata mainly in Ningbo and eastern harbor of Liaoning. The mud snail soft body part contains abundant protein and polypeptide. The current research shows that the mud snail polypeptide has the function of resisting tumors, but the research on the osteogenic differentiation of the bone marrow mesenchymal stem cells of the mud snail polypeptide is not available at present.
Disclosure of Invention
The invention aims to provide a new application of mud snail polypeptide in promoting osteogenic differentiation of bone marrow mesenchymal stem cells.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an accelerant for promoting osteogenic differentiation of mesenchymal stem cells, which is mud snail polypeptide.
Preferably, the mesenchymal stem cell is a bone marrow mesenchymal stem cell.
Preferably, the preparation method of the mud snail polypeptide comprises the following steps:
(1) cleaning the mud snail, taking a soft tissue, freeze-drying, crushing, and adding 3 times of water by weight to obtain mud snail homogenate;
(2) adding papain with the weight 0.02 times that of the mud snail homogenate, adjusting the pH to 6, and carrying out thermostatic water bath at 55 ℃ for 4 hours to obtain mud snail enzymolysis liquid;
(3) heating in water bath at 95 deg.C for 20 min, centrifuging at 5000r/min, and collecting supernatant to obtain crude bullacta exarata extract;
(4) the crude mud snail extracting solution passes through a nanofiltration membrane with the aperture of 2nm to obtain a fine mud snail extracting solution;
(5) and (3) placing the extracting solution of the mud snail into a vacuum freeze dryer for vacuum freeze drying to obtain the mud snail polypeptide.
Preferably, the promoter is used for promoting differentiation of the mesenchymal stem cells into osteoblasts.
In addition, the invention provides application of the mud snail polypeptide in promoting osteogenic differentiation of bone marrow mesenchymal stem cells.
Preferably, the use comprises the use of the mudsnail polypeptide in promoting the expression of osteogenic differentiation genes ALP, RUNX2 and BGLAP of the bone marrow mesenchymal stem cells.
Preferably, the preparation method of the mud snail polypeptide comprises the following steps:
(1) cleaning the mud snail, taking a soft tissue, freeze-drying, crushing, and adding 3 times of water by weight to obtain mud snail homogenate;
(2) adding papain with the weight 0.02 times that of the mud snail homogenate, adjusting the pH to 6, and carrying out thermostatic water bath at 55 ℃ for 4 hours to obtain mud snail enzymolysis liquid;
(3) heating in water bath at 95 deg.C for 20 min, centrifuging at 5000r/min, and collecting supernatant to obtain crude bullacta exarata extract;
(4) the crude mud snail extracting solution passes through a nanofiltration membrane with the aperture of 2nm to obtain a fine mud snail extracting solution;
(5) and (3) placing the extracting solution of the mud snail into a vacuum freeze dryer for vacuum freeze drying to obtain the mud snail polypeptide.
In addition, the invention provides a preparation method of the mud snail polypeptide, which comprises the following steps:
(1) cleaning the mud snail, taking a soft tissue, freeze-drying, crushing, and adding 3 times of water by weight to obtain mud snail homogenate;
(2) adding papain with the weight 0.02 times that of the mud snail homogenate, adjusting the pH to 6, and carrying out thermostatic water bath at 55 ℃ for 4 hours to obtain mud snail enzymolysis liquid;
(3) heating in water bath at 95 deg.C for 20 min, centrifuging at 5000r/min, and collecting supernatant to obtain crude bullacta exarata extract;
(4) the crude mud snail extracting solution passes through a nanofiltration membrane with the aperture of 2nm to obtain a fine mud snail extracting solution;
(5) and (3) placing the extracting solution of the mud snail into a vacuum freeze dryer for vacuum freeze drying to obtain the mud snail polypeptide.
In addition, the invention provides application of the mud snail polypeptide in preparing the osteogenic differentiation accelerant for the mesenchymal stem cells.
The invention has the beneficial effects that:
the invention proves that the mud snail polypeptide has the application of promoting the osteogenic differentiation of bone marrow mesenchymal stem cells for the first time, and proves that the mud snail polypeptide can effectively promote the expression of osteogenic differentiation related genes BGLAP, ALP and RUNX2, thereby providing more osteoblasts for treating diseases such as osteoporosis, bone injury and the like.
Drawings
FIG. 1 shows the effect of various concentrations of mudsnail polypeptide on the expression of mRNA of the osteogenic differentiation-associated gene ALP.
FIG. 2 shows the effect of mud snail polypeptides with different concentrations on the expression of the BGLAP mRNA related to osteogenic differentiation.
FIG. 3 is a graph showing the effect of various concentrations of mudsnail polypeptide on the expression of mRNA of the osteogenic differentiation related gene RUNX 2.
FIG. 4 shows the effect of mud snail polypeptide on the expression of BGLAP, ALP and RUNX2 genes related to osteogenic differentiation.
Figure 5 effect of bullacta polypeptides on mineralization of mesenchymal stem cells.
Detailed Description
The following detailed description of the essential contents of the present invention is provided by referring to specific embodiments, which should be construed as merely illustrative and not limitative of the scope of the present invention.
Example 1
(1) Cleaning mud snails, taking 100g of soft tissue, crushing freeze-dried powder, and adding 300g of water to obtain mud snail homogenate;
(2) adding 8g of papain, adjusting the pH to 6, and carrying out constant-temperature water bath at 55 ℃ for 4 hours to obtain a mud snail enzymolysis solution;
(3) heating in water bath at 95 deg.C for 20 min, centrifuging at 5000r/min, and collecting supernatant to obtain crude bullacta exarata extract;
(4) the crude mud snail extracting solution passes through a nanofiltration membrane with the aperture of 2nm to obtain a fine mud snail extracting solution;
(5) and (3) placing the extracting solution of the mud snail into a vacuum freeze dryer for vacuum freeze drying to obtain the mud snail polypeptide.
Example 2
Fluorescent quantitative PCR experiment
RNA extraction
(1) The bone marrow mesenchymal stem cells are inoculated in a culture plate, when the cell density reaches 70%, osteogenic induction culture solution containing 0mg/ml, 25mg/ml, 50mg/ml and 100mg/ml mud snail polypeptides is respectively added, the solution is changed once every 2-3 days, and each group is provided with 3 repeats.
(2) After 14 days of culture, removing the culture medium, adding 500 μ L Trizol, and repeatedly blowing and beating the cells until clear and non-viscous liquid is formed;
(3) transferring the mixed solution to a 1.5ml EP tube, adding 100 mu L of chloroform, violently shaking and fully mixing the mixture on an oscillator for 15s, and standing the mixture for 5 minutes at room temperature;
(4) centrifuging at a low temperature and a high speed at 12000r/min for 15min at 4 ℃, and carefully transferring the upper layer transparent RNA aqueous phase into a new RNA enzyme-free EP tube;
(5) adding isopropanol with the same volume, mixing, standing on ice for 10min, 13000r/min, centrifuging at 4 deg.C for 10min, discarding supernatant, and retaining precipitate;
(6) adding 40 μ L of 70% ethanol, shaking gently, centrifuging at 12000r/min at 4 deg.C for 5min, discarding supernatant, placing the tube opening downward, tightly attaching to filter paper, removing liquid at the tube opening, drying at room temperature for 5-10min, and detecting RNA quality and concentration.
Reverse transcription of RNA into cDNA
(1) Reverse transcription system
(2) Conditions of reverse transcription reaction
37℃ 15min；85℃ 5s；4℃
3. Fluorescent quantitative PCR reaction
Reaction system:
reaction conditions are as follows:
10min at 95 ℃; 30s at 95 ℃, 40s at 60 ℃ and 40 cycles; 5min at 72 ℃.
4. Primer sequences
As shown in FIGS. 1, 2 and 3, it can be seen from FIG. 1 that the relative expression amounts of ALP gene in the 25mg/ml mud snail polypeptide group were 1.10. + -. 0.06 (P > 0.05), the relative expression amounts of ALP gene in the 50mg/ml group were 1.57. + -. 0.14 (P < 0.01), and the relative expression amounts of ALP gene in the 100mg/ml group were 2.10. + -. 0.18 (P < 0.001).
As can be seen from FIG. 2, the BGLAP gene expression level of the 25mg/ml mud snail polypeptide group was 1.61. + -. 0.14 (P < 0.01), the BGLAP gene expression level of the 50mg/ml group was 2.40. + -. 0.08 (P < 0.001), and the BGLAP gene expression level of the 100mg/ml group was 2.71. + -. 0.19 (P < 0.001).
As can be seen from FIG. 3, the relative expression level of RUNX2 gene in the 25mg/ml mud snail polypeptide group was 1.12. + -. 0.04 (P < 0.05), that of RUNX2 gene in the 50mg/ml group was 1.323. + -. 0.11 (P < 0.05), and that of RUNX gene in the 100mg/ml group was 1.737. + -. 0.06 (P < 0.001).
The results show that the mud snail polypeptide can effectively promote the expression of the osteogenic differentiation related genes ALP, BGLAP and RUNX2 of the bone marrow mesenchymal stem cells, and has excellent effect at 100 mg/ml.
Example 3
Western blot detection
1. Protein extraction
(1) Inoculating bone marrow mesenchymal stem cells into a culture plate, respectively adding osteogenic induction culture solution containing 0mg/ml and 100mg/ml mud snail polypeptides when the cell density reaches 70%, changing the culture solution every 2-3 days, and setting 3 repeats in each group.
(2) After 14 days, 100 μ L RIPA lysate was added to the culture plate, cells were scraped off with a cell scraper, and the cell lysate was collected into an EP tube;
(3) crushing the cells by using a cell ultrasonic crusher, centrifuging for 15min at 4 ℃ at 12000 r/min;
(4) the supernatant was transferred to a new EP tube and the protein concentration was measured using the BCA method;
(5) the protein concentration was adjusted to 2. mu.g/. mu.L using 5 Xloading buffer and the protein sample was obtained by boiling for 5 min.
Western blot experiment
(1) Preparing 12% separation gel and 5% concentrated gel, and adding 10 μ L protein sample into each well;
(2) electrophoresis conditions: concentrating the gel at constant pressure of 90V for about 20 minutes; the separation gel is 130V, and the time is about 1 h;
(3) and (3) electrotransfer conditions: constant current 280mA, NC film with 0.45nm aperture; the film transferring time is 1.5 h;
(4) gently taking out the membrane with forceps, placing in 5% skimmed milk powder, and sealing at room temperature for 1 h;
(5) cutting bands according to protein size, incubating corresponding ALP, RUNX2 and BGLAP primary antibody, and incubating overnight at 4 ℃;
(6) taking out the membrane the next day, incubating at room temperature for 30min, washing the membrane with TBST for 3 min each time, and repeating for 3 times;
(7) incubating the secondary antibody, and incubating for 1h in a shaking table at room temperature;
(8) the membrane was washed with TBST for 3 minutes each, repeated 3 times, and subjected to development exposure.
The experimental results are shown in fig. 4, and it can be seen from the figure that the mud snail polypeptide has an effect of promoting the expression of osteogenic differentiation related genes ALP, RUNX2 and BGLAP protein.
Example 4
Alizarin red staining experiment
(1) Inoculating bone marrow mesenchymal stem cells into a culture plate, respectively adding osteogenic induction culture solution containing 0mg/ml and 100mg/ml mud snail polypeptides when the cell density reaches 70%, changing the culture solution every 2-3 days, and setting 3 repeats in each group.
(2) After 21 days of culture, the cell culture medium was removed, the cells were washed 3 times with PBS, 3 minutes each time, 2ml of 4% paraformaldehyde was added to each well, and fixed at room temperature for 30 min;
(3) removing paraformaldehyde, washing cells with PBS for 3 times, 3 min each time, adding 1.5ml alizarin red staining solution into each well, and standing at 37 deg.C for 30 min;
(4) cells were washed 3 times with PBS for 3 minutes each and photographed using an inverted microscope.
The experimental result is shown in fig. 5, and it can be seen from the figure that the bullacta exarata polypeptide can significantly enhance the mineralization capability of bone marrow mesenchymal stem cells.
In conclusion, the invention proves that the mud snail polypeptide can obviously promote osteogenic differentiation of bone marrow mesenchymal stem cells.
Sequence listing
<110> Sino Situo New cell medicine Limited
<120> an agent for promoting osteogenic differentiation of mesenchymal stem cells
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ggtgtggtag tgagtggtgg 20
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gccttctcca tggtggtgaa 20
Claims (3)
1. An accelerant for promoting osteogenic differentiation of bone marrow mesenchymal stem cells, wherein the accelerant is a mud snail polypeptide;
the preparation method of the mud snail polypeptide comprises the following steps:
(1) cleaning the mud snail, taking a soft tissue, freeze-drying, crushing, and adding 3 times of water by weight to obtain mud snail homogenate;
(2) adding papain with the weight 0.02 times that of the mud snail homogenate, adjusting the pH to 6, and carrying out thermostatic water bath at 55 ℃ for 4 hours to obtain mud snail enzymolysis liquid;
(3) heating in water bath at 95 deg.C for 20 min, centrifuging at 5000r/min, and collecting supernatant to obtain crude bullacta exarata extract;
(4) the crude mud snail extracting solution passes through a nanofiltration membrane with the aperture of 2nm to obtain a fine mud snail extracting solution;
(5) and (3) placing the extracting solution of the mud snail into a vacuum freeze dryer for vacuum freeze drying to obtain the mud snail polypeptide.
2. The accelerating agent according to claim 1, wherein the accelerating agent is used for accelerating differentiation of mesenchymal stem cells into osteoblasts.
3. A preparation method of mud snail polypeptide, which is characterized by comprising the following steps:
(1) cleaning the mud snail, taking a soft tissue, freeze-drying, crushing, and adding 3 times of water by weight to obtain mud snail homogenate;
(2) adding papain with the weight 0.02 times that of the mud snail homogenate, adjusting the pH to 6, and carrying out thermostatic water bath at 55 ℃ for 4 hours to obtain mud snail enzymolysis liquid;
(3) heating in water bath at 95 deg.C for 20 min, centrifuging at 5000r/min, and collecting supernatant to obtain crude bullacta exarata extract;
(4) the crude mud snail extracting solution passes through a nanofiltration membrane with the aperture of 2nm to obtain a fine mud snail extracting solution;
(5) and (3) placing the extracting solution of the mud snail into a vacuum freeze dryer for vacuum freeze drying to obtain the mud snail polypeptide.
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| CN202010576883.6A CN111534487B (en) | 2020-06-22 | 2020-06-22 | Promoter for promoting osteogenic differentiation of mesenchymal stem cells |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105194645A (en) * | 2014-06-20 | 2015-12-30 | 浙江海洋学院 | Application of bullacta exarata polypeptides in resisting prostatic cancer |
| CN105316380A (en) * | 2014-06-20 | 2016-02-10 | 浙江海洋学院 | Application of mud snail polypeptide in lung cancer resistance |
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| JP5243021B2 (en) * | 2006-12-28 | 2013-07-24 | 三菱化学メディエンス株式会社 | Genetic markers for detecting cells such as mesenchymal stem cells |
| CN105441389B (en) * | 2015-12-15 | 2018-11-20 | 天津市康婷生物工程有限公司 | Promote mesenchymal stem cell at the highly expressed method of osteanagenesis key gene |
| CN108771666A (en) * | 2018-03-23 | 2018-11-09 | 苏州大学附属第医院 | Kartogenin improves the application of mesenchymal stem cell Osteoblast Differentiation ability drug preparing |
| CN108753887A (en) * | 2018-06-16 | 2018-11-06 | 谢崇林 | A kind of polypeptide and the application in terms of promoting Proliferation of Bone Mesenchymal Stem Cells |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105194645A (en) * | 2014-06-20 | 2015-12-30 | 浙江海洋学院 | Application of bullacta exarata polypeptides in resisting prostatic cancer |
| CN105316380A (en) * | 2014-06-20 | 2016-02-10 | 浙江海洋学院 | Application of mud snail polypeptide in lung cancer resistance |
Non-Patent Citations (2)
| Title |
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| 泥螺多肽提取工艺的优化及抗菌活性研究;赵华龙 等;《食品工业》;20181231;第39卷(第4期);摘要 * |
| 泥螺多肽酶解工艺的优化及其体外抗肿瘤活性的初步研究;曹玉昊 等;《食品科技》;20131231;第38卷(第12期);摘要 * |
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