CN110639063B - Mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide - Google Patents
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Abstract
The invention relates to a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide and a preparation method thereof. The mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide has the following structure: collagen in the collagen-hydroxyapatite composite material is connected with hyaluronic acid oligosaccharide through a C-N bond to obtain the glycosylation modified mineralized collagen composite material, and the molecular weight of the hyaluronic acid oligosaccharide is 776-5000 Da. The invention firstly utilizes Schiff base reaction to modify collagen with hyaluronic acid oligosaccharide to obtain covalently bound glycosylated collagen, and firstly proposes that the glycosylated collagen is used as a mineralization template in bone scaffold design, thereby not only exerting the functions of low molecular weight HA favorable for cell migration, proliferation, differentiation and wound healing promotion, but also providing a new material basis and a research strategy for in vitro construction of a vascularization scaffold.
Description
The present application is a divisional application of the following applications: application No. 2017101926909, application No. 3/28 of 2017, title of invention creation: mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide and preparation method thereof
Technical Field
The invention relates to a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide and a preparation method thereof, belonging to the technical field of biomedical materials.
Background
Bone defects caused by trauma, tumors, infection, pathological factors and the like are quite common in clinic, and become one of the difficult problems which puzzle the healthy life of human beings. Bone grafting has become the largest volume graft second only to blood transfusion and has a tendency to increase year by year. At present, the bone repair materials for clinical application comprise autogenous bone, allogeneic bone, xenogeneic bone, artificial bone and the like, but have certain problems and can not completely solve the huge clinical requirements on the bone materials. Despite limited sources and secondary trauma issues, autologous bone remains the best clinically effective bone implant material today and has been the "gold standard" for the treatment of bone defects. Therefore, by simulating the components and the structure of natural bone, scientists at home and abroad prepare bionic composite bone materials of different forms of collagen-hydroxyapatite by an in vitro artificial synthesis method, and the bionic composite bone materials are applied to clinic. However, with the intensive research and the follow-up of clinical application, it is found that these materials have the disadvantages of insufficient bioactivity or insufficient bone repair effect compared with autologous bone, and it is difficult to obtain ideal repair effect. In addition, the bone is a highly vascularized tissue, and the current research on tissue engineering bone mostly neglects the revascularization of the graft, for large bone defects, the range of nutrition and oxygen permeation of peripheral tissues is limited, and the formation of the endogenous blood vessels of the implanted bone material is slow or difficult to vascularize, which finally results in the remarkable reduction of the osteogenic activity of the transplanted bone and even the necrosis of central cells of the tissue. Therefore, the problems of insufficient biological activity, vascularization and the like of the traditional bone scaffold material still remain the key point of tissue engineering bone research.
Hyaluronic Acid (HA) is a natural extracellular matrix, HAs good biocompatibility and physicochemical properties, can affect proliferation, migration and differentiation of cells, and particularly HAs biological activities of promoting vascularization, wound repair and immunoregulation of oligosaccharide oHA. At present, the binding of hyaluronic acid to proteins such as collagen for the construction of tissue materials has been studied, but the use of hyaluronic acid having a large molecular weight, which is an oligosaccharide of at least 5kD, has been focused. This is mainly because oHA below 5kD is difficult and expensive to produce and the lower the molecular weight, the greater the difficulty in designing the material.
Chinese patent document CN105903081A (application No. 201510926063.4) discloses a preparation method of a novel double-layer proteoglycan-based repair material, wherein hyaluronic acid and type I collagen (Col I) are mainly combined through charge and hydrogen bond effects, and then a three-dimensional reticular composite material is obtained through freeze drying and thermal crosslinking treatment, and the polysaccharide and collagen composite material is mainly applied to the repair of soft tissues.
The basic material which is more important in the tissue engineering bone is collagen/hydroxyapatite composite material, the preparation process and the components of the material are continuously improved, the prior mechanical mixing of calcium phosphate and collagen is gradually developed into the directional arrangement of inorganic particles on polymer matrixes such as collagen and the like to realize the effective compounding of inorganic components and organic components, and in addition, the defect of poor mechanical property of the collagen is improved by introducing other components. Chinese patent document CN101590293A (application No. 200910149959.0) discloses a method for preparing HA (herein referred to as hydroxyapatite)/collagen/chitosan interpenetrating polymer network scaffold, which comprises dispersing hydroxyapatite sol prepared by using PVP as a template in a collagen and chitosan blend solution, performing post-treatment such as pressure reduction and degassing after two-step cross-linking to obtain a composite scaffold, wherein although inorganic particles in the scaffold are well dispersed in a collagen/chitosan matrix, the overall operation process is more, and natural bone is a hierarchical structure formed by using collagen as a template through regulation of non-collagen or interaction between collagen and a mineral phase to realize nucleation and mineralization of calcium phosphate and based on a self-assembly process of collagen, the multi-level ordered structure formed from micro-level to macro-level of the bone is very important for the performance and function of the bone, and the separately prepared hydroxyapatite is only cross-linked and combined on the polymer matrix in the document, microstructural biomimetics of bone was not achieved.
Disclosure of Invention
Aiming at the huge demand of the current clinical bone transplantation and the defects of the existing bone repair material, the invention overcomes the defects of the prior art and provides a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide and a preparation method thereof.
The technical scheme of the invention is as follows:
a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide has the following structure:
collagen in the collagen-hydroxyapatite composite material is connected with hyaluronic acid oligosaccharide through a C-N bond to obtain the glycosylation modified mineralized collagen composite material, and the molecular weight of the hyaluronic acid oligosaccharide is 776-5000 Da.
According to the invention, the preferable sugar-carrying mass percentage of the hyaluronic acid oligosaccharide modified collagen is 0.909% -5.266%.
According to the invention, the collagen is preferably type I collagen, and the molecular weight of the collagen is 8-12 KD.
The structure assembly process of the mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide is as follows:
self-assembling collagen molecules modified by hyaluronic acid oligosaccharide to form collagen microfibrils; regulating the calcium-phosphorus salt to be arranged along the axial orientation of the microfibrils by glycosylated collagen molecules, and further assembling to form mineralized collagen fibers; the mineralized collagen fibers are further assembled to form glycosylation mineralized collagen fiber bundles in an orientation arrangement (as shown in figure 2); the mineralized materials are assembled into a nanofiber bionic bone repair material (shown in figure 1) through electrostatic spinning.
A preparation method of a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide comprises the following steps:
(1) mixing collagen, hyaluronic acid and NaBH3CN is added into the reaction system, stirred and reacted for 1 to 3 days at the temperature of 36 to 38 ℃ in the dark, then an acetic acid solution is added for dilution, ultrafiltration and centrifugation are carried out, and after precipitation and drying, the glycosylated collagen is prepared;
the reaction system is a mixed solution of one of Hexafluoroisopropanol (HFP) or dimethyl amide (DMF) solvent and sodium bicarbonate, the molar concentration of the sodium bicarbonate is 0.05-0.15M, and the volume ratio of the hexafluoroisopropanol or dimethyl amide to the sodium bicarbonate is 3 (1-3);
the mass concentration of the collagen added into the reaction system is 18-22 g/L, the mass concentration of the hyaluronic acid added into the reaction system is 4-6 g/L, and NaBH is added3The mass concentration of CN added into the reaction system is 6 g/L-18 g/L;
(2) adding the glycosylated collagen prepared in the step (1) into hydrochloric acid, stirring and dissolving to prepare a glycosylated collagen solution with the concentration of 0.5-0.7 mg/ml, and then adding CaCl2Uniformly mixing the solution, standing for 8-15 min, and then stirring and adding NaH2PO4Adjusting the pH of the solution to 7, standing for 2-24 h at 25-38 ℃, performing solid-liquid separation, washing the precipitate, and drying to obtain the sugarA mineralized composite collagen material is based;
the CaCl is2The addition amount of the solution is that 0.023-0.0913 mol of CaCl is added to each gram of collagen in the step (1)2；CaCl2With NaH2PO4The molar ratio of (1.5-1.8): 1;
(3) dissolving a forming agent in hexafluoroisopropanol to prepare a solution with the mass concentration of 2-4%, and then adding the glycosylated collagen mineralized composite material prepared in the step (2), wherein the mass ratio of the glycosylated collagen mineralized composite material to the forming is (1-3): 1, uniformly mixing, and performing electrostatic spinning to form porous nanofiber, thereby preparing the mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide;
the forming agent is collagen, polylactic acid or glycosylated collagen prepared in the step (1);
preferably, in the step (1), the molar concentration of the sodium bicarbonate is 0.1M, and the volume ratio of the hexafluoroisopropanol or the dimethylamide solvent to the sodium bicarbonate is 3: 2; the collagen is type I collagen, the mass concentration of the collagen added into the reaction system is 20g/L, the mass concentration of the hyaluronic acid added into the reaction system is 5g/L, and NaBH is added3The mass concentration of CN added into the reaction system is 6 g/L.
Preferably, in step (1), the reaction is stirred for 1 day at 37 ℃ in the absence of light.
According to the invention, in the step (1), the mass concentration of the acetic acid solution is 5%, and the dilution volume is 8 times.
Preferably, in step (1), the ultrafiltration tube for ultrafiltration centrifugation is 30k, and the centrifugation conditions are as follows: 4000g/min, 25 min/time and 3-8 times of ultrafiltration.
According to the present invention, in the step (1), the drying is vacuum freeze drying.
According to the present invention, in the step (2), the concentration of hydrochloric acid is preferably 0.01M.
Preferably, in the step (2), the concentration of the glycosylated collagen solution is 0.6 mg/ml.
According to the invention, in the step (2), the pH regulator is NaOH solution with the concentration of 0.1-0.5M. In the process of pH adjustment, when the pH is close to or reaches 6, the solution begins to be turbid, the change fluctuation is large when the pH is about 6.2, the reaction is still carried out at the moment, the stirring is continued, the NaOH solution is dripped until the pH of the system is 7, and then the stirring is continued for 2 hours.
Preferably, in the step (2), standing is carried out for 22-24 hours at 37 ℃; preferably, the cleaning process is repeated centrifugal cleaning for 3 times by using deionized water, and the centrifugal cleaning is carried out for 8min at 8000-10000 r/min.
According to the present invention, in the step (2), the drying is vacuum freeze drying.
According to the invention, in the step (3), the mass concentration of the final electrospinning solution is 8%; preferably, the forming agent is glycosylated collagen.
According to the invention, in the step (3), the uniform mixing is performed by adopting magnetic stirring and mixing for 5-10 min, then carrying out ultrasonic treatment at 400-500W for 20min, and continuing stirring for 24-48 h; preferably, the spinning voltage is 15-20 kv, the speed is 0.6-1.0 mL/h, the receiving distance is 8-15 cm, and the receiving device is an aluminum foil or a cover glass with the diameter of 14mm placed on the aluminum foil;
a biocompatibility detection method of a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide comprises the following steps:
a. carrying out fixed cross-linking treatment and drying on the mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide to be detected to prepare a pretreatment material;
b. sterilizing the pretreatment material, soaking for 2.5-3.5 h by using an ethanol solution with the mass concentration of 70%, then transferring into sterilized PBS (phosphate buffer saline) for buffer soaking for 2h, taking out and repeatedly soaking for 3-4 times, and then soaking for 0.5h by using a 1640 culture medium or an α -MEM culture medium to prepare a pretreated sample;
c. co-culturing endothelial cell PIEC or precursor osteoblast MC3T3-E1 with the pretreated sample obtained in step c at a cell density of 103～104Per cm2，37℃、5％CO2Culturing under the condition, detecting proliferation of cells at 1d, 3d, 5d and 7d after culturing, and scanningAnd observing the adhesion and growth forms of the cells on the scaffold after 3d and 5d of culture by an electron microscope (SEM), detecting the expression condition of the alkaline phosphatase ALP of the MC3T3-E1 in the culture process, and evaluating the biocompatibility according to the result.
The biocompatibility evaluation described above can be evaluated by methods that are conventional in the art. For example, endothelial cell PIEC can be referred to a related method in "collagen-chitosan nanofiber biomimetic extracellular matrix prepared by electrospinning" (Chen Zong-gang; Donghua university, 2007.); MC3T3-E1 cells can be referenced to the methods related in biocompatibility of modified poly (D, L-lactic acid) with MC3T3-E1 cells (Zhengdanfang; Chongqing university, 2008.).
Preferably, in the step a, the fixing and crosslinking treatment is carried out by steam treatment with 25% glutaraldehyde for 24-36 h or soaking in a 95% ethanol system containing EDC (1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride) for 20-24 h; preferably, the drying is performed by standing in a vacuum drying oven for 3-5 days.
Preferably, in the step c, the culture medium is changed every 2 to 3 days during the culture process.
The 1640 culture medium and the α -MEM culture medium are both conventional commercial culture media in the field, and the endothelial cell PIEC and the precursor osteoblast MC3T3-E1 are conventional commercial cells in the field.
Advantageous effects
1. According to the invention, the Schiff base reaction is utilized for carrying out hyaluronic acid oligosaccharide modification on collagen for the first time, so that the covalently bound glycosylated collagen can be obtained, and besides the functions of low molecular weight HA favorable for cell migration, proliferation and differentiation, the covalently bound glycosylated collagen also HAs potential influences on the aspects of collagen space configuration and activity, molecular recognition, cell communication, signal transduction and the like; compared with the prior art that the crosslinking of micromolecule oligosaccharide and collagen is realized by utilizing a physical mode, the glycosylated collagen prepared by the invention has remarkable advantages; in addition, the method is simple and low in cost by using the low-molecular-weight HA to modify the collagen, and the collagen can be used for a template for calcium phosphate deposition in a subsequent mineralization reaction, so that the collagen HAs potential application in the research of repair and regeneration of hard tissues;
2. the invention utilizes hyaluronic acid oligosaccharide fragment capable of promoting vascularization to modify collagen bionic extracellular matrix, and the prepared material can endow the material with anticoagulation and vascularization promoting functions while improving the biocompatibility of the material, so that the stent can survive for a long time after being transplanted into a body, thereby providing a new material foundation and a research mode for constructing the vascularization promoting stent of vascularization tissue engineering bone and other tissues;
3. the scaffold designed by the invention is based on the bionics principle and the self-assembly technology, realizes the nucleation and mineralization of calcium phosphate by using glycosylated collagen as a template for the first time, has the components and the microstructure closer to natural bone tissues, is expected to promote angiogenesis in new bones and improve the osteogenesis effect, and has the characteristic of biological activity compared with the composite scaffold which is obtained by dispersing the existing independently prepared hydroxyapatite sol in the collagen/chitosan blended solution to obtain the oriented arrangement of inorganic particles in a polymer matrix;
4. the invention utilizes the electrostatic spinning technology to form the bracket material, which is different from the simple mechanical mixing of inorganic powder and high molecular material in the prior art, the preparation of the electrospinning system is that the mineralization and nucleation of calcium and phosphorus salt on collagen are realized through biomineralization to obtain the mineralized composite material, so that the inorganic/organic two phases can form a tight bond and have a certain orientation relation, and then a certain amount of polymers such as collagen or polylactic acid and the like and the freeze-dried mineralized composite powder are introduced to form a uniform mixing system for electrospinning, so that the nano porous fiber of the mineralized material is obtained, is more close to the form of natural extracellular matrix, is beneficial to the adhesion and growth of cells, and good pores are easier to be connected with the inward migration of cells and the diffusion of nutrient substances; the method for pre-precipitating the polymer to obtain the composite material and then optimizing the conditions for electrospinning can effectively improve the problems of poor inorganic particle dispersibility or phase separation in a mechanical mixing system.
Drawings
FIG. 1 is an infrared spectrum of collagen Col, collagen/hydroxyapatite Col/HAP, glycosylated collagen/hydroxyapatite Col/oHAs/HAP;
FIG. 2 is a TEM morphology of collagen/oHAs/hydroxyapatite material synthesized by reaction standing for 24 h;
FIG. 3 is an SEM morphology of a Col/HAP-Col-3-1 blend fiber scaffold;
FIG. 4A is an SEM image of endothelial cells when cultured in Col/HAP-Col-3-1 for 3 days;
FIG. 4B is an SEM image of endothelial cells when cultured in Col/HAP-PLA-3-1 for 3 days;
FIG. 5 shows the results of the proliferation tendency of endothelial cells on various mineralized collagen fiber scaffolds;
FIG. 6A is an SEM image of endothelial cells cultured on Col/HAP-Col-3-2 for 5 days;
FIG. 6B is an SEM image of endothelial cells cultured on Col/oHAs/HAP-Col-3-2 for 5 days;
FIG. 6C is an SEM image of endothelial cells cultured on Col/HA/HAP-Col-3-2 for 5 days;
FIG. 7 is a bar graph showing the results of ALP detection of MC3T3-E1 on Col/HAP-Col-3-2, Col/oHAs/HAP-3-2, Col/HA/HAP-Col-3-2 scaffolds;
FIG. 8 is a bar graph showing the results of the proliferation tendency of MC3T3-E1 on Col/HAP-Col-3-2, Col/oHAs/HAP-Col/oHAs-3-2, Col/HA/HAP-Col/HA-3-2 fibrous scaffolds;
FIG. 9 is an SEM topography of MC3T3-E1 on Col/oHAs/HAP-Col/oHAs-3-2 fibrous scaffolds.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following embodiments and the drawings of the specification, but the scope of the present invention is not limited to these embodiments.
Source of raw materials
Sodium hyaluronate raw material HA was purchased from Huaxi furuida biomedical limited, molecular weight 5 kD;
the collagen is type I collagen with a molecular weight of 10kD and is purchased from Doctorle biotechnology limited;
example 1
Preparation of glycosylated collagen (Col/HA, HA is hyaluronic acid raw material before enzymolysis):
preparing a reaction system: weighing 80mg of collagen and 20mg of HA (5K), and recrystallizing NaBH3CN 30mg in a 25mL glass vial was added to the reaction system (i.e., HFP and 0.1M NaHCO)3Mixed medium, volume ratio 3:2)5mL, blackMagnetically stirring for 24h at 37 ℃ under dark condition;
washing of reaction samples: after the reaction is finished, transferring the reaction solution into a small beaker, adding 5% acetic acid for 8 times dilution, subpackaging the diluted reaction solution into 6 30K ultrafiltration tubes, carrying out ultrafiltration centrifugal displacement for 6 times at 4000g/min and 25 min/time, and then collecting a sample for vacuum freeze drying;
and (3) determining the sugar carrying amount of the reaction sample: sugar content of the dried Col/HA was measured by carbazole-ethanol method, and the amount of sugar was 5.266%.
Example 2
Preparation of glycosylated collagen (Col/oHAs, which are oligosaccharides after enzymatic hydrolysis):
the process as described in example 1, except that 80mg of collagen, 20mg of oHAs (776.5-2293.4), and recrystallized NaBH were used3CN 30mg, ultrafiltered, centrifuged and replaced 4 times.
And (3) measuring the sugar content of the dried Col/HA by using a carbazole-ethanol method, wherein the measured sugar content is 2.101%.
The oHAs are the tetrasaccharide, the hexasaccharide, the octasaccharide, the decasaccharide, the dodecasaccharide and the mixture thereof which are obtained by performing enzymolysis, separation and purification on 5k sodium hyaluronate, and the molecular weight range is 776-.
The preparation steps of the hyaluronic acid oligosaccharide are shown in optimal conditions of hyaluronic acid hydrolysis reaction catalyzed by hyaluronidase (Zhenzhen, Nirshijie, Wangfeng mountain, etc., China journal of biochemical medicine [ J ].2007,25(3): 62-64).
Example 3
Preparation of glycosylated collagen mineralized composite (Col/oHAs/HAP):
60mg of the dried glycosylated collagen (Col/oHAs) obtained in example 2 was weighed into 100mL of HCl (0.01M) solution, dissolved by magnetic stirring to obtain a Col/HA solution, and CaCl was slowly added dropwise while stirring214mL of (0.1M) solution, uniformly mixing, standing for 10min, continuously stirring, and slowly dropwise adding NaH2PO48.4mL (Ca: P ═ 1.66) of the (0.1M) solution, followed by slowly adding dropwise 0.1M NaOH while stirring to adjust the pH of the system, and the solution started to become cloudy when the pH reached 6,the fluctuation is large when the pH is about 6.2, the reaction is still carried out at the moment, NaOH is continuously dripped until the pH of the system is 7, and then the mixture is continuously stirred for 2 hours and the pH of the mineralization system is kept unchanged; standing for 24h at 37 ℃ after stirring is finished, pouring out a supernatant, washing precipitates with deionized water, centrifuging for 3 times (8 min/time) at 8000r/min, finally freeze-drying a sample, grinding to obtain mineralized collagen composite material powder modified by hyaluronic acid, expressing the mineralized collagen composite material powder by Col/oHAs/HAP, wherein HAP is hydroxyapatite formed by mineralization, and carrying out infrared analysis and SEM and TEM observation on the morphology of the powder.
Observing that the surface of the glycosylated collagen fiber is covered by a large amount of irregular inorganic particles by an SEM picture; FTIR results are shown in figure 1, three characteristic peaks of the amide bond of the epidermal protein are changed after the collagen is mineralized, particularly the absorption peak of the amide III band is obviously reduced and nearly disappears, which shows that carboxyl or carbonyl on the collagen is passed through and is close to Ca in the mineralization process2+ provides nucleation sites to combine hydroxyapatite formed by the reaction with the template to form the mineralized composite material, and the introduction of phosphate radical also makes collagen mineralized and reacted at 1024cm-1、870cm-1、603cm-1And 564cm-1The change of absorption peak is present; the low magnification TEM image of Col/oHAs/HAP in FIG. 2 shows that the mineralized glycosylated collagen has a substantially bundle-like structure.
Example 4
Preparation of glycosylated collagen mineralized composite (Col/HA/HAP):
in this example, collagen was modified with hyaluronic acid having a molecular weight of 5K, glycosylated collagen Col/HA was prepared according to example 1, a Col/HA sample obtained by drying was dissolved in HCl (0.01M), and a glycosylated collagen mineralized composite Col/HA/HAP was prepared according to the specific mineralization conditions of example 3.
Example 5
Preparing a mineralized collagen composite material (Col/HAP-Col-3-1) nanofiber porous scaffold:
the mineralized collagen preparation method used in this example was described with reference to example 3, except that untreated collagen, which is more soluble than glycosylated collagen, was directly dissolved in HCl (0.01M); and (3) obtaining the collagen/nano hydroxyapatite composite material after mineralization treatment and freeze drying, wherein the collagen/nano hydroxyapatite composite material is represented by Col/HAP:
① weighing 45mg of collagen, adding 2mL of HFP, magnetically stirring for 10min to dissolve the collagen, adding 135mg of ground Col/HAP powder after the collagen is fully dissolved, carrying out ultrasonic treatment with power of 450W for 20min after adding the powder in order to better disperse the mineralized collagen powder in an electrospinning system, and then continuing to magnetically stir for 32h to enable the electrospinning solution to reach a good viscous state;
② transferring the electrospinning solution into a 1mL injector, adjusting spinning parameters, adjusting the liquid feeding rate to 0.9mL/h, the spinning voltage to 20kv and the receiving distance to 10cm, and receiving the electrospinning fibers by using a cover glass with the diameter of 14mm placed on an aluminum foil to prepare the mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide;
③ placing the collected electrospun fiber sample in a vacuum drying oven for 2d to remove residual organic reagent, spraying gold on the surface of the sample, and observing by an electron microscope, as shown in FIG. 3, the porous nanofiber structure can be obtained under the condition of 3:1 blending of mineralized collagen and collagen, but the fiber has more bead structures and blocky substances due to the existence of inorganic components;
④ fixing the electro-spinning fiber, placing the fiber sample in a dryer with 25% glutaraldehyde solution in mass percentage concentration at the bottom, treating the fiber sample with glutaraldehyde steam for 30h under a closed condition, taking out the sample, placing the sample in a vacuum drying oven, standing for several days to remove toxic reagents, placing the fixed fiber membrane in O.O1M PBS (pH 7.4) buffer solution for soaking for 2d, removing liquid, placing the sample in the vacuum drying oven for drying, and observing according to a scanning electron microscope to find that the collagen blending group material has certain swelling and coarsens fiber diameter, but polylactic acid group has little change, the fiber appearance of the material still basically exists, and the material still has higher porosity and good pore connectivity.
Example 6
Preparing a hyaluronic acid oligosaccharide modified mineralized collagen (Col/oHAs/HAP-Col-3-2) nanofiber scaffold:
weighing 64mg of collagen, adding 2mL of HFP, magnetically stirring to dissolve the collagen, adding 96mg of ground Col/oHAs/HAP powder prepared in example 4 after the collagen is fully dissolved, carrying out ultrasonic treatment for 20min after adding the powder in order to better disperse the mineralized collagen powder in an electrospinning system, then continuing to magnetically stir for 24h, starting spinning after the electrospinning solution reaches a good viscous state, and then specifically carrying out the following steps in reference example 5.
Example 7
The PIEC grows on a bracket mixed by Col/HAP and collagen or polylactic acid according to a ratio of 3: 1:
pretreatment of materials: Col/HAP-Col-3-1, Col/HAP-PLA-3-1, wherein Col/HAP-PLA-3-1 is used as reference for preparation
Example 5, except that polylactic acid was blended with the prepared Col/HAP powder instead of collagen, the obtained electrospun fiber membrane was subjected to fixation crosslinking before use. Putting 3 pieces of the materials into a 24-hole plate, performing ultraviolet sterilization, soaking for 3h in 70% ethanol with another volume concentration, sucking out the ethanol, soaking for 4 times in sterile PBS buffer solution for 6h, then soaking for 0.5h in 1640 culture medium (purchased from Hyclone) without serum, and completing the specific operation in a biological safety cabinet;
cell planting, namely inoculating 200uL of the prepared PIEC cell suspension into each hole, wherein the planting density is 1.9 × 104Per cm2After culturing for 4 hours in the incubator, 400 mu L of culture medium is added into each hole, and the cells are changed every 2 to 3 days;
and (3) appearance observation: and taking out each group of material-cell samples after 3d of culture, cleaning for 3 times by sterile PBS, fixing for 3 hours at normal temperature by glutaraldehyde with the mass concentration of 2.5%, dehydrating by gradient ethanol, finally carrying out vacuum freeze drying on the samples, and observing the appearance after gold spraying. SEM pictures of endothelial cells cultured on the material for 3 days show that the cells can fully extend on the material, can maintain the normal growth state of the cells, are polygonal or rhombic, can form protrusions between the cells, and can observe the phenomenon that the cells grow stereoscopically and migrate to the interior of the material in partial areas, which indicates that the material prepared by the method has better biocompatibility, and is shown in figure 4.
Example 8
Biocompatibility of PIEC with glycosylated mineralized collagen:
process reference example 7 with the differenceThe initial planting density of the cells is 1.03 × 104Per cm2The experimental group materials are Col/HAP-Col-3-2, Col/oHAs/HAP-Col-3-2, Col/HA/HAP-Col-3-2, the proliferation of cells is determined by an MTT method, and the appearance is observed by SEM;
from the proliferation results of the cells (see fig. 5), the proliferation rate of the endothelial cells after 3 days of culture began to increase, and the proliferation amplitude of the endothelial cells on the glycosylated material group was relatively larger than that of the unlinked material group, especially the mineralized collagen material group modified by oligosaccharides. From the SEM image of 5 days of cell culture (see FIG. 6), it was found that the cells showed aggregation and sheet growth in the partial region of the glycosylated material group, whereas such phenomenon was not observed in the non-linked group.
It is thus presumed that the introduction of low molecular weight hyaluronic acid into the material affects the growth behavior of cells such as adhesion and proliferation.
Example 9
MC3T3-E1 cases of expressing alkaline phosphatase ALP on each material:
the method was as described in example 7, except that the cells were cultured in MC3T3-E1 in a medium of α -MEM, the materials of the experimental group were Col/HAP-Col-3-2, Col/oHAs/HAP-Col-3-2, Col/HA/HAP-Col-3-2, and the detection criteria were the expression of alkaline phosphatase activity on each material after 21, 28, and 35 days of cell culture.
As can be seen from fig. 7, the cells expressed ALP activity on the glycosylated mineralized material was relatively high compared to the unlinked material.
Example 10
Proliferation and expression of ALP on MC3T3-E1 on respective materials:
the method was as described in example 7, except that the cultured cells were MC3T3-E1, and the experimental group materials were Col/HAP-Col-3-2, Col/oHAs/HAP-Col/oHAs-3-2, Col/HA/HAP-Col/HA-3-2, MC3T3-E1, and the cell planting density was 2.15 × 104Per cm2The culture medium is α -MEM liquid culture medium containing 10% fetal bovine serum.
As can be seen from FIG. 8, the proliferation of cells on the glycosylated mineralized material was relatively high compared to the unlinked mineralized material, and from the ALP assay results, no alkaline phosphatase activity was detected when MC3T3-E1 was cultured on the material for 7 days, and then its activity was detected in 14, 21, and 28d of the culture, and the activity of the hyaluronic acid oligosaccharide-modified material group was relatively high at each time point, indicating that the above materials, particularly the glycosylated modified material, can promote the gradual differentiation of MC3T3-E1 into mature osteoblasts.
Example 11
Growth morphology of MC3T3-E1 on Col/oHAs/HAP-Col/oHAs blend fiber scaffolds:
the method was as described in reference example 7, except that the MC3T3-E1 cells were initially seeded at a density of 1.6 × 104Per cm2And taking out the material-cell sample after 4d of culture, washing for 3 times by sterile PBS, carrying out vacuum freeze drying after subsequent fixation and dehydration, and observing the appearance after gold spraying. As can be seen from the SEM morphology of MC3T3-E1 cultured on the material for 4 days, the cells can be fully stretched and adhered on the material, the normal growth state of the cells is maintained, the cells are polygonal or fusiform, and protrusions are formed among the cells, so that the cells and the material can be well contacted, and powerful conditions are provided for the physiological behaviors of proliferation, differentiation, signal transmission and the like of the cells. Compared with the group of non-glycosylated materials, the glycosylation modified material group has more phenomena (as indicated by arrows in fig. 9) that MC3T3-E1 cells migrate to the interior of the material or grow into the interior of the material, which indicates that collagen can promote the three-dimensional migration of MC3T3-E1 cells after glycosylation modification, and has certain influence on the growth behavior of the cells.
Claims (9)
1. A mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide has the following structure:
the collagen in the collagen-hydroxyapatite composite material is connected with hyaluronic acid oligosaccharide through a C-N bond to obtain the glycosylation modified mineralized collagen composite material, wherein the molecular weight of the hyaluronic acid oligosaccharide is 776-5000 Da;
self-assembling collagen molecules modified by hyaluronic acid oligosaccharide to form collagen microfibrils; regulating the calcium-phosphorus salt to be arranged along the axial orientation of the microfibrils by glycosylated collagen molecules, and further assembling to form mineralized collagen fibers; the mineralized collagen fibers are further assembled to form glycosylation mineralized collagen fiber bundles which are arranged in an orientation mode; and (3) assembling the mineralized material into a nanofiber bionic bone repair material through electrostatic spinning.
2. The mineralized collagen-simulated bone repair material according to claim 1, wherein the hyaluronic acid oligosaccharide-modified collagen has a sugar content of 0.909% to 5.266%.
3. The mineralized collagen-simulated bone repair material according to claim 1, wherein the collagen is type I collagen and has a molecular weight of 8-12 KD.
4. The mineralized collagen-simulated bone repair material according to claim 1, prepared by the following steps:
(1) mixing collagen, hyaluronic acid and NaBH3CN is added into the reaction system, stirred and reacted for 1 to 3 days at the temperature of 36 to 38 ℃ in the dark, then an acetic acid solution is added for dilution, ultrafiltration and centrifugation are carried out, and after precipitation and drying, the glycosylated collagen is prepared;
the reaction system is a mixed solution of one of Hexafluoroisopropanol (HFP) or dimethyl amide (DMF) solvent and sodium bicarbonate, the molar concentration of the sodium bicarbonate is 0.05-0.15M, and the volume ratio of the hexafluoroisopropanol or dimethyl amide to the sodium bicarbonate is 3 (1-3);
the mass concentration of the collagen added into the reaction system is 18-22 g/L, the mass concentration of the hyaluronic acid added into the reaction system is 4-6 g/L, and NaBH is added3The mass concentration of CN added into the reaction system is 6 g/L-18 g/L;
(2) adding the glycosylated collagen prepared in the step (1) into hydrochloric acid, stirring and dissolving to prepare a glycosylated collagen solution with the concentration of 0.5-0.7 mg/ml, and then adding CaCl2Uniformly mixing the solution, standing for 8-15 min, and then stirring and adding NaH2PO4Adjusting the pH of the solution to 7, standing for 2-24 h at 25-38 ℃, performing solid-liquid separation, washing a precipitate, and drying to obtain the glycosylated collagen mineralized composite;
the CaCl is2The addition amount of the solution is the step(1) Adding 0.023-0.0913 mol of CaCl into each gram of collagen2；CaCl2With NaH2PO4The molar ratio of (1.5-1.8): 1;
(3) dissolving a forming agent in hexafluoroisopropanol to prepare a solution with the mass concentration of 2-4%, and then adding the glycosylated collagen mineralized composite material prepared in the step (2), wherein the mass ratio of the glycosylated collagen mineralized composite material to the forming agent is (1-3): 1, uniformly mixing to obtain an electrospinning solution, and carrying out electrostatic spinning to obtain a mineralized collagen bionic bone repair material modified by hyaluronic acid oligosaccharide;
the forming agent is collagen, polylactic acid or glycosylated collagen prepared in the step (1).
5. The mineralized collagen-simulated bone repair material according to claim 4, wherein one or more of the following conditions are met:
i. in the step (1), the molar concentration of sodium bicarbonate is 0.1M, and the volume ratio of hexafluoroisopropanol or dimethyl amide solvent to sodium bicarbonate is 3: 2; the collagen is type I collagen, the mass concentration of the collagen added into the reaction system is 20g/L, the mass concentration of the hyaluronic acid added into the reaction system is 5g/L, and NaBH is added3The mass concentration of CN added into the reaction system is 6 g/L;
in the step (1), stirring and reacting for 1 day at 37 ℃ under the condition of keeping out of the light;
in the step (1), the mass concentration of the acetic acid solution is 5%, and the dilution volume multiple is 8 times;
in the step (1), the ultrafiltration tube for ultrafiltration centrifugation is 30k, and the centrifugation conditions are as follows: 4000g/min, 25 min/time and 3-8 times of ultrafiltration;
v. in the step (1), the drying is vacuum freeze drying.
6. The mineralized collagen-simulated bone repair material according to claim 4, wherein the hydrochloric acid concentration in step (2) is 0.01M.
7. The mineralized collagen-simulated bone repair material according to claim 4, wherein the concentration of the glycosylated collagen solution in step (2) is 0.6 mg/ml.
8. The mineralized collagen-simulated bone repair material according to claim 4, wherein one or more of the following conditions are met:
i. in the step (2), the pH regulator is NaOH solution with the concentration of 0.1-0.5M;
in the step (2), standing for 22-24 h at 37 ℃;
in the step (2), the washing process is repeated centrifugal washing for 3 times by using deionized water, and the washing process is carried out for 8min at 8000-10000 r/min;
in said step (2), the drying is vacuum freeze drying.
9. The mineralized collagen-simulated bone repair material according to claim 4, wherein one or more of the following conditions are met:
i. in the step (3), the mass concentration of the electrospinning solution is 8%;
in the step (3), the forming agent is glycosylated collagen;
in the step (3), the step of uniformly mixing is to adopt magnetic stirring to mix for 5-10 min, then carry out ultrasonic treatment at 400-500W for 20min, and continue stirring for 24-48 h;
in the step (3), the electrostatic spinning voltage is 15-20 kv, the speed is 0.6-1.0 mL/h, the receiving distance is 8-15 cm, and the receiving device is an aluminum foil or a cover glass with the diameter of 14mm placed on the aluminum foil.
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