WO2020258713A1 - 一种M细胞靶向和pH响应性的淀粉基载体材料及其制备方法与应用 - Google Patents
一种M细胞靶向和pH响应性的淀粉基载体材料及其制备方法与应用 Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
- A61K47/61—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule the organic macromolecular compound being a polysaccharide or a derivative thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/08—Ethers
- C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
- C08B31/125—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch having a substituent containing at least one nitrogen atom, e.g. cationic starch
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/36—Polysaccharides; Derivatives thereof, e.g. gums, starch, alginate, dextrin, hyaluronic acid, chitosan, inulin, agar or pectin
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/69—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
- A61K47/6921—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere
- A61K47/6925—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere the form being a microcapsule, nanocapsule, microbubble or nanobubble
Definitions
- the invention relates to a starch-based carrier material, in particular to a starch-based carrier material with M cell targeting and pH responsiveness, and a preparation method and application thereof.
- the mucosal immune system is the largest component of the entire immune system and is the first line of defense of the human body. It contains about three-quarters of immune cells, of which M cells are the main entrance for mucosal uptake and capture of antigens. M cells are mainly distributed in the lymph node epithelium (FAE) of Peyer’s pathway. They are closely arranged with intestinal epithelial cells. The intestinal epithelium forms irregular microvilli, which helps it to take in antigenic substances from the intestinal lumen of the upper digestive tract. There are abundant swallowing vesicles and mitochondria in the cytoplasm of M cells, but less lysozyme. There is a membranous fold on the top of the M cell, and the base is deeply sunken into a pocket.
- FAE lymph node epithelium
- the intestinal epithelium forms irregular microvilli, which helps it to take in antigenic substances from the intestinal lumen of the upper digestive tract.
- T cells There are T cells, B cells and macrophages in the pocket.
- This structure shortens the distance between the antigen-containing vesicles across the M epithelium, and facilitates the rapid entry of the antigen into the subepithelial lymphatic tissue to induce mucosal immune response.
- M cells transport a wide range of substances, including bacteria, viruses, antigens and particles. Since the distribution of M cells in the intestine is very small, specific targeting of M cells can enhance the absorption and transport of immune substance particles by M cells. Studies have shown that targeted delivery of antigens to M cells can increase the amount of antigen uptake in Peyer’s node and activate more T cells and B cells to participate in the immune response.
- the intestinal mucosa can deliver antigens and other immune substances to the intestinal mucosa, and protect it from the gastrointestinal environment and local mucosal environment; Cells, improve the absorption and transport efficiency of immune substances by M cells, and enhance mucosal immune response.
- M cells There are a variety of specific recognition receptors on the surface of M cells, such as protein peptides, glycoproteins, and phospholipids. Choosing appropriate ligands and using them for targeted modification of polymers can increase the transport of M cells to polymer particles. effectiveness.
- Garinot et al. used photografting technology to modify RGD peptides with polyethylene glycol (PEG).
- PEG polylactic acid
- PCL-PEG polylactic acid
- the amphiphilic copolymer is reprocessed by oil in water. After encapsulating the target functional protein in water, the transport efficiency of M cells to the target functional protein is enhanced.
- the good water solubility and water absorption of PEG molecules themselves can improve the ability of tablets to release drugs in tablet formulations, and it is difficult to achieve controlled and sustained release of drugs.
- PEG molecules can change the biofilm structure of various types of cells and have certain effects on cells. Damage.
- the grafting rate of RGD is low, and the N element content after grafting is only 0.16%.
- chitosan Targeted delivery of chitosan nanoparticles to Peyer's patch using M cell-homing peptide selected by phage display technology[J].Biomaterials, 2010, 31(30) : 7738-7747.)
- M cell targeting peptide amino acid sequence is CKSTHPLSC
- chitosan carrier material with the function of targeting M cells was prepared by ion gel method.
- chitosan is easy to dissolve in an acidic environment, which is not conducive to protecting the functional activity of active substances in the gastrointestinal tract.
- M cells were acylated by acylation.
- the targeting peptide GRGDS was grafted onto the cationized ⁇ -glucan, and the nanoparticles formed by embedding the antigen PR8 had good targeting of M cells, but failed to control the release of antigen in the gastrointestinal environment during oral administration. the study.
- M cell targeting carrier materials can protect immune active substances from being released and inactivated in the physiological environment of the gastrointestinal tract.
- carrier materials is mostly synthetic polymer materials, which have potential hazards. Natural polymer carrier materials are mainly concentrated in chitosan. However, due to the solubility of the material itself, it is not conducive to the impact of immunologically active substances. Controlled release in the gastrointestinal tract.
- M-cell carrier materials need to have the following characteristics: (1) It has a good embedding effect on immunologically active substances and can be combined with The active substance forms a stable transmission system; (2) It can resist the influence of strong acid, pH changes and enzymatic hydrolysis in the physiological environment of the gastrointestinal tract, so as to realize the controlled release of the active substance in the gastrointestinal environment; (3) With M Cell targeting function, through the recognition of specific receptors on the surface of M cells to achieve the function of targeting M cells, and improve the transport efficiency of M cells to active substances.
- Starch is a kind of polysaccharide that exists widely in nature. It is non-toxic, biodegradable and has good biocompatibility. Studies have shown that starch-based carrier materials have good bioadhesion, but the drug delivery system stays longer in specific parts of the biofilm, which helps mucosal immune cells to absorb and transport it.
- the purpose of the present invention is to overcome the above shortcomings and deficiencies of the prior art and develop a starch-based carrier material with M cell targeting and pH responsiveness.
- the primary purpose of the present invention is to provide a starch-based carrier material for M cell targeting and pH responsiveness.
- the starch-based carrier material not only has good M cell targeting properties, but also has good gastrointestinal pH responsiveness, certain resistance to enzymolysis, and high loading capacity.
- Another object of the present invention is to provide a method for preparing the above-mentioned M cell targeting and pH-responsive starch-based carrier material.
- Another object of the present invention is to provide the application of the starch-based carrier material for M cell targeting and pH responsiveness.
- a starch-based carrier material with M cell targeting and pH responsiveness is as follows:
- the starch-based carrier material for M cell targeting and pH responsiveness has a molecular weight of 7.04 ⁇ 10 4 to 2.11 ⁇ 10 6 g/mol, a degree of substitution of carboxymethyl groups of 0.04 to 0.28, and a targeting peptide GRGDS grafted The amount is 0.01% to 1.12% (calculated based on the N element content).
- R being H or R 1 or R 2 does not mean that in the molecular structure, R is H at the same time or R is at the same time R 1 or R is at the same time R 2 at the same time, but it represents the starch of M cell targeting and pH responsiveness
- a part of R is H, a part is R 1 , and a part is R 2 .
- a method for preparing the above-mentioned M cell targeting and pH-responsive starch-based carrier material includes the following steps:
- carboxymethyl starch is prepared by etherification reaction with monochloroacetic acid
- the GRGDS short peptide is grafted onto the carboxymethyl starch molecular chain through an acylation reaction. After the reaction is completed, the unreacted catalyst and short peptide are removed by dialysis. Starch-based carrier material with M cell targeting function.
- the molecular weight of the starch described in step (1) is 1.0 ⁇ 10 6 ⁇ 1.0 ⁇ 10 7 g/mol;
- the etherification reaction in step (1) refers to the reaction at 40-50°C for 2 to 4 hours; the molar ratio of starch and monochloroacetic acid in step (1) is 1:0.1 to 0.4;
- the degree of substitution of the carboxymethyl starch in step (2) is 0.04-0.27;
- the acylation reaction in step (2) refers to the reaction at 25-35°C for 12-24 hours; the acylation reaction needs to be carried out in the presence of a catalyst, and the catalyst is 1-ethyl-(3-dimethyl A mixture of aminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide (NHS), preferably 1-ethyl-(3-dimethylaminopropyl) with a molar ratio of 1:1 A mixture of carbodiimide (EDC) and N-hydroxysuccinimide (NHS).
- the catalyst is 1-ethyl-(3-dimethyl
- EDC aminopropyl)carbodiimide
- NHS N-hydroxysuccinimide
- step (2) The amount of carboxymethyl starch, catalyst, and GRGDS peptide in step (2) meets the following requirements: in molar terms, the ratio of carboxymethyl group: catalyst: GRGDS peptide is 1:1:1 to 4:1 :1 (wherein the molar ratio of EDC and NHS in the catalyst is 1:1)
- the carboxymethyl starch after the reaction in step (1) can be subjected to enzymolysis, enzyme inactivation, and lyophilization, and then used as the raw material carboxymethyl starch in step (2) for acylation reaction.
- the enzymatic hydrolysis refers to the enzymatic hydrolysis of pullulanase followed by high-temperature ⁇ -amylase enzymatic hydrolysis.
- the conditions of pullulanase enzymatic hydrolysis are: unit enzyme activity 15U/g (carboxymethyl starch dry basis), Enzymatic hydrolysis at 50°C for 16-24 hours; high-temperature resistant ⁇ -amylase enzymatic hydrolysis conditions: unit enzyme activity 100U/g (Carboxymethyl starch dry basis), enzymatic hydrolysis at 80°C for 10-30 minutes.
- the active substance in the oral preparation is preferably a positively charged immunologically active substance.
- the present invention has the following advantages and beneficial effects:
- the method for preparing a starch-based carrier material with M cell targeting and pH response provided by the present invention has simple operation, mild reaction conditions and strong controllability.
- the present invention provides a starch-based carrier material with M cell targeting and pH response.
- the grafted M cell targeting peptide GRGDS can specifically recognize and bind to M cells, which helps to improve M cells.
- the bioavailability of active substances enhances the immune response.
- the present invention provides a starch-based carrier material with M cell targeting and pH response.
- the stomach of the carrier material can be adjusted by adjusting the degree of substitution of carboxymethyl groups and the grafting amount of the M cell targeting peptide GRGDS.
- the intestinal controlled release effect and M cell targeting ability are suitable for the oral immune function of different active substances.
- Figure 1 is an infrared spectrogram of the starch-based carrier materials prepared in Examples 1 to 3.
- Figure 2 is a hydrogen nuclear magnetic resonance spectrum of the starch-based carrier materials prepared in Examples 1 to 3.
- Figure 3 shows the zeta potential of starch-based carrier materials prepared in Examples 1-3 under different pH conditions.
- Figure 4 shows the cytotoxicity of starch-based carrier materials prepared in Examples 1 to 3.
- Fig. 5 is a laser confocal image of the co-culture of the starch-based carrier material prepared in Examples 1 to 3 and the cell monolayer composed of M cells and Caco-2 cells.
- Figure 6 shows the M cell transport efficiency of starch-based carrier materials prepared in Examples 1 to 3.
- Figure 7 shows the encapsulation efficiency of the starch-based carrier materials prepared in Examples 1 to 3 on the target protein.
- Fig. 8 is a laser confocal image of co-culture of assembled microcapsules obtained by embedding OVA with starch-based carrier materials prepared in Examples 1 to 3 and cell monolayers composed of M cells and Caco-2 cells.
- Figure 9 shows the M cell transport efficiency of the assembled microcapsules obtained by embedding OVA with starch-based carrier materials prepared in Examples 1 to 3.
- the reagents used in the examples can be conventionally purchased from the market unless otherwise specified.
- GRGDS short peptide was purchased from Gil Biochemical Co., Ltd.
- OVA egg protein
- the cells used in the experiment were human colon cancer cell Caco-2 cells (ATCC: HTB37) and human lymphoma cell Raji B cells (ATCC: CCL-86), both of which were purchased from the China Type Culture Collection (CCTCC).
- test conditions of the zeta potential in the examples refer to the literature "Zhang Y, Chi C, Huang X, et al. Starch-based nanocapsules fabricated through layer-by-layer assembly for oral delivery of protein to lower gastrointestinal tract[J].Carbohydrate polymers,2017, 171:242-251.”, the specific test conditions are: the sample concentration is 5mg/mL, the solvent is a phosphate buffer (0.01M) with different pH, and the test instrument is a nano laser particle size analyzer (Malvern Instruments Co., Ltd., UK Company), the test temperature is 25°C, the number of tests is 3 times, the equilibrium time is 2min, and the equilibrium temperature is 25°C.
- the Caco-2 cell suspension was placed on the filter membrane (Corning, USA, 3 ⁇ m, filter membrane surface area 1.12cm 2 ) at the bottom of the 12-well polycarbonate Transwell cell in an amount of 0.5 mL per well, at 37°C, 5% CO 2. Incubate for 14 days under saturated steam conditions. During the culture process, 0.5 mL of high-glycemic DMEM medium was added to the inner chamber (above the filter membrane), and 1 mL of high-glycemic DMEM medium was added to the bottom side of the chamber (under the filter membrane), and the medium was replaced every two days.
- the cell resistance of the monolayer is tested by a transmembrane cell resistance meter, and the cells with cell resistance greater than 300 ⁇ /cm are selected for further co-cultivation.
- DMEM/RPMI 1640 mixed medium add 0.5 mL of DMEM/RPMI 1640 mixed medium to the chamber, and 1.5 mL of mixed medium to the bottom of the chamber. The medium needs to be replaced every day.
- a layer is formed on the top of the filter membrane at the bottom of the Transwell chamber.
- the starch-based carrier material was fluorescently labeled with cationized fluorescent nanoparticles (Thermo Fisher Scientific, INC), and the fluorescently labeled samples were diluted with DMEM (2% FBS) culture solution to a sample concentration of 1.5 ⁇ 10 5 Cells/mL, after equilibrating at 37°C for a period of time, add 0.5mL to the inner chamber of the Transwell chamber with cell monolayers of M cells and Caco-2 cells, and add 1.5mL DMEM (2% FBS) to the outer chamber. ) Culture medium.
- DMEM 2% FBS
- the cells were washed with PBS, and then the corresponding secondary antibody (Anti rat IgG-488) (Jackson ImmunoRasearch Laboratories, INC.) was added, and the cells were treated at 37°C for 1 h. After the end, wash with PBS, and finally add Hoechst 33342 staining agent to stain all nuclei for 2 minutes. After cleaning with PBS, remove the filter membrane of the chamber and place it on a glass slide, cover it with a cover glass, and test with a laser confocal microscope to observe the targeting of starch-based carrier materials to M cells. If the different fluorescently labeled starch-based carrier materials and the fluorescent positions of M cells overlap, it indicates that the starch-based carrier material has M cell targeting.
- M cell targeted transport experiment reference "Garinot M, Fiévez V, Pourcelle V, et al. PEGylated PLGA-based nanoparticles targeting M cells for oral vaccination[J].Journal of Controlled Release,2007,120(3):195- 204.” method with slight modifications, the specific steps are as follows: the M cell targeted transport experiment was performed on the bottom filter membrane of the Transwell cell with the cell monolayer of M cells and Caco-2 cells.
- the starch-based carrier material is fluorescently labeled with cationized fluorescent nanoparticles (Thermo Fisher Scientific, INC), and the fluorescently labeled sample is diluted with DMEM (2% FBS) broth to a sample concentration of 1.5 ⁇ 10 5 pcs/mL
- DMEM 2% FBS
- the culture plate was placed in a 37°C, 5% CO 2 incubator and incubated for 4 hours, and the fluorescent-labeled starch-based carrier material after targeted transport by M cells entered the culture medium of the outer chamber.
- the transport efficiency of M cells to the starch-based carrier material can be calculated by the following formula. The calculation method of transport efficiency is as follows:
- dQ/dt is the number of fluorescently labeled starch-based carrier materials transported in the outer chamber per unit time (pieces/s)
- A is the area of the cell monolayer in the Transwell plate (cm 2 )
- C 0 is the addition to the inner chamber
- the method of in vitro simulated release of target protein (OVA) by starch-based carrier materials refers to the literature "Zhang Y, Chi C, Huang X, et al. Starch-based nanocapsules fabricated through layer-by-layer assembly for oral delivery of protein to lower gastrointestinal tract[J].Carbohydrate polymers,2017,171:242-251.”, the specific steps are: the assembled microcapsules obtained after the starch-based carrier material is embedded in OVA are placed in 150mL simulated gastric juice for 2h, and the sample solution 2mL is immediately centrifuged (10000rpm/min, 10, min), take the supernatant and measure the OVA content to calculate the release rate; then centrifuge the assembled microcapsules in the simulated gastric juice (10000rpm/min, 10, min), and place them in 150mL of simulated small intestinal fluid 4h, immediately centrifuge 2mL of the sample solution (10000rpm/min, 10min), take the supernatant and measure the OVA content to calculate the release
- Simulated gastric juice Dissolve 7mL concentrated HCl in a small amount of water, shake well in a beaker and transfer to a 1L volumetric flask to make the volume constant with double distilled water.
- Simulated small intestinal juice Weigh 6.8g KH 2 PO 4 and add a certain amount of water to dissolve it, drop its pH to 6.8 with NaOH lye, and add a small amount of pancreatin (Singma-Aldrich Technology Co., Ltd.) (10g) aqueous solution to it. Transfer to a 1L volumetric flask to make the volume constant with double distilled water.
- RGD-CMS1 The infrared spectrum and the hydrogen nuclear magnetic resonance spectrum of the starch-based carrier material (RGD-CMS1) prepared in this example are shown in Figure 1 and Figure 2 respectively.
- RGD-CMS1 Figure 1
- Figure 2 The infrared spectrum of RGD-CMS1 ( Figure 1), RGD-CMS1 has two new absorption peaks at 1730 and 1250 cm -1 , which are the absorption peaks of the amide I band and the amide III band, which proves that RGD-CMS1 In the presence of amide bonds.
- RGD-CMS1 is negatively charged, while protonation at pH (1.2) in the stomach is almost uncharged, and protonation at pH (6.8) in the small intestine, with a zeta potential of -21.85 mV (the results are shown in Figure 3).
- the carboxymethyl starch and starch-based carrier material RGD-CMS1 without branched polypeptide were co-cultured with Caco-2 cells and M cells in the cell monolayer on the bottom filter membrane of the Transwell chamber.
- the results are shown in Figure 5, where A1-A4 are laser confocal micrographs of unbranched carboxymethyl starch co-cultured with Caco-2 cells and M cells, and B1-B4 are starch-based carrier materials RGD-CMS1 and Caco-2 cells and M Confocal laser micrograph of cells co-cultured.
- A1 and B1 are the nuclei of Caco-2 cells and M cells in the cell monolayer on the filter membrane at the bottom of the Transwell chamber (the bright spots in the figure);
- A2 and B2 are the M cells in the cell monolayer (specific for M cells). Observation of sex antibody labeling, bright spot in the figure);
- A3 and B3 are fluorescently labeled carboxymethyl starch without grafted polypeptide and starch-based carrier material RGD-CMS1 (bright spot in the figure);
- A4 and B4 are the top 3 respectively Overlay of each figure. It can be seen from A4 that the carboxymethyl starch of ungrafted polypeptide does not overlap with the fluorescent position of M cells (the positions of different arrows in the figure), and they are scattered.
- the carboxymethyl starch of ungrafted polypeptide does not have M Cell targeting. From B4, it can be concluded that the starch-based carrier material RGD-CMS1 overlaps with the fluorescent position of M cells in the cell monolayer on the bottom of the Transwell cell on a large area (arrow 1 in the figure points to M cells, and arrow 2 points to fluorescently labeled Starch-based carrier material, the overlapping part of M cells and starch-based carrier material is marked with a circle), indicating that the starch-based carrier material RGD-CMS1 exhibits good M targeting ability.
- the carboxymethyl starch with a carboxymethyl substitution degree of 0.04 prepared in step (1) is first enzymatically hydrolyzed by pullulanase (unit enzyme activity 15U/g (carboxymethyl starch dry basis)) at 50°C for 24 hours Then, it was enzymatically hydrolyzed with high temperature resistant ⁇ -amylase (unit enzyme activity 100U/g (carboxymethyl starch dry basis)) at 80°C for 30 min to obtain carboxymethyl starch with a molecular weight of 6.99 ⁇ 10 4 g/mol ( CMS2);
- RGD-CMS2 The infrared spectrum and hydrogen nuclear magnetic resonance spectrum of RGD-CMS2 obtained in this example are shown in Figure 1 and Figure 2, respectively.
- RGD-CMS2 In the infrared spectrum of RGD-CMS2 ( Figure 1), RGD-CMS2 is at 1730 and 1250 cm -1 Two new absorption peaks appeared, namely the absorption peaks of amide I band and amide III band, which proved the existence of amide bond in RGD-CMS2.
- RGD-CMS2 is negatively charged, but protonated at pH (1.2) in the stomach without charge, and deprotonated at pH (6.8) in the small intestine, with a zeta potential of -1.98 mV (the result is shown in Figure 3).
- the starch-based carrier material RGD-CMS2 was co-cultured with Caco-2 cells and M cells in the cell monolayer on the bottom filter membrane of the Transwell cell.
- the results are shown in Figure 5, where C1 is the cell monomolecular on the bottom filter membrane of the Transwell cell
- C2 is the M cell in the cell monolayer (observed by the M cell specific antibody labeling, the bright spot in the figure);
- C3 is the fluorescently labeled starch-based
- the carrier material RGD-CMS2 (the bright spot in the picture);
- C4 is the superimposed picture of the first 3 pictures respectively.
- the starch-based carrier material RGD-CMS2 partially overlaps with the fluorescent position of M cells in the cell monolayer on the bottom filter membrane of the Transwell chamber (the arrow 1 in the figure points to the M cell, and the arrow 2 points to the fluorescently labeled starch-based
- the carrier material, the overlapping part of the M cell and the starch-based carrier material is marked with a circle), indicating that the starch-based carrier material RGD-CMS2 exhibits a certain M targeting ability.
- the transport efficiency of M cells to starch-based carrier materials before and after grafting the targeting peptide is shown in Figure 6. It can be seen from the figure that compared to the carboxymethyl starch obtained in step (2), the M cells have a positive effect on RGD-CMS2. (Referred to as R-CMS2 in the figure), the transport efficiency is increased by 1.05 times.
- step (1) The carboxymethyl starch with a carboxymethyl substitution degree of 0.24 obtained in step (1) is first enzymatically hydrolyzed by pullulanase (unit enzyme activity 15U/g (carboxymethyl starch dry basis)) at 50°C for 16 hours Then, use high-temperature-resistant ⁇ -amylase (unit enzyme activity 15U/g (carboxymethyl starch dry basis)) to enzymolyze at 80°C for 10 min to obtain carboxymethyl starch with a molecular weight of 4.56 ⁇ 10 5 g/mol ( CMS3);
- a starch-based carrier material with a molecular weight of 4.58 ⁇ 10 5 g/mol, a degree of carboxymethyl substitution of 0.25, and a grafting amount of the targeting peptide GRGDS of 0.71% (calculated based on the N element content) was obtained ( RGD-CMS3).
- RGD-CMS3 is negatively charged, but protonated at pH (1.2) in the stomach without charge, and deprotonated at pH (6.8) in the small intestine, with a zeta potential of -27.3 mV (the result is shown in Figure 3).
- the starch-based carrier material RGD-CMS3 was co-cultured with Caco-2 cells and M cells in the cell monolayer on the bottom filter membrane of the Transwell cell, as shown in Figure 5, where D1 is the cell monolayer on the bottom filter membrane of the Transwell cell The nuclei of Caco-2 cells and M cells in the middle (the bright spot in the figure); D2 is the M cell in the cell monolayer (observed by M cell specific antibody labeling, the bright spot in the figure); D3 is a fluorescently labeled starch-based carrier Material RGD-CMS3 (the bright spot in the picture); D4 is the superimposed picture of the first 3 pictures respectively.
- the starch-based carrier material RGD-CMS3 partially overlaps with the fluorescent position of M cells in the cell monolayer on the bottom filter membrane of the Transwell chamber (the arrow 1 in the figure points to the M cell, and the arrow 2 points to the fluorescently labeled starch-based
- the carrier material, the overlapping part of the M cell and the starch-based carrier material is marked with a circle), indicating that the starch-based carrier material RGD-CMS3 exhibits a certain M targeting ability.
- the transport efficiency of M cells to starch-based carrier materials before and after grafting the targeting peptide is shown in Figure 6. It can be seen from the figure that compared to the carboxymethyl starch obtained in step 2, the M cells have a positive effect on RGD-CMS3 ( Figure 6). (Referred to as R-CMS3 in Chinese), the transport efficiency is increased by 2.1 times.
- concentrations 5mg/mL and 2mg/mL, respectively .
- Take a certain amount of starch-based carrier material solution in a beaker, according to the mass ratio of OVA: starch-based carrier material 1:2, use a dropper to slowly drop a certain amount of OVA solution into the carrier solution, and the dripping process will not stop.
- the calculation method of the encapsulation rate is as follows:
- m 0 the total mass of OVA in the input system
- m 1 the mass of OVA in the supernatant
- the encapsulation efficiency of the starch-based carrier material prepared in Examples 1 to 3 on the target protein is shown in Figure 7. It can be seen from Figure 7 that when the degree of carboxymethyl substitution is high, the starch-based carrier material has a higher degree of encapsulation of the target protein. The encapsulation rate is higher.
- the assembled microcapsules obtained by embedding the starch-based carrier materials prepared in Examples 1 to 3 with OVA were co-cultured with Caco-2 cells and M cells in the cell monolayer on the bottom filter membrane of the Transwell chamber.
- the laser confocal diagram is shown in the figure As shown in 8, A1 ⁇ C1 are the nuclei of Caco-2 cells and M cells in the cell monolayer on the filter membrane at the bottom of the Transwell chamber (the bright spots in the figure); A2 ⁇ C2 are the M cells in the cell monolayer (by M Observed by cell-specific antibody labeling, bright spots in the figure); A3 ⁇ C3 are the assembled microcapsules (highlights) constructed by embedding OVA with starch-based carrier materials prepared in Examples 1 to 3 with fluorescent labels; A4 ⁇ C4 are respectively An overlay of the first 3 images.
- the assembled microcapsules constructed by the starch-based carrier material embedded OVA partially overlap with the fluorescent position of M cells in the cell monolayer on the bottom filter membrane of the Transwell chamber (arrow 1 in the figure points to M cells, arrow 2
- the overlapping part of M cells and starch-based carrier material is marked with a circle), and as the amount of GRGDS peptide grafting is larger, the overlapping part is more, indicating that the starch-based carrier material is embedding OVA Afterwards, it showed a certain M targeting ability, and the grafting amount of GRGDS affected the M cell targeting ability of the assembled microcapsules constructed by the starch-based carrier material embedded OVA.
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Abstract
Description
Claims (10)
- 一种根据权利要求1所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于包括以下步骤:(1)以淀粉为原料,利用一氯乙酸通过醚化反应制备羧甲基淀粉;(2)以羧甲基淀粉为原料,通过酰化反应将GRGDS短肽接枝到羧甲基淀粉分子链上,反应结束后通过透析除去未反应的催化剂和短肽,经冻干后获得具有M细胞靶向功能的淀粉基载体材料。
- 根据权利要求2所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于:步骤(1)反应结束后的羧甲基淀粉经过酶解、灭酶活、冻干后再作为步骤(2)的原料羧甲基淀粉进行酰化反应。
- 根据权利要求3所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于:所述的酶解是指先经过普鲁兰酶酶解后再进行耐高温α-淀粉酶酶解,普鲁兰酶酶解条件为:单位酶活15U/g,在50℃下酶解16~24h;耐高温α-淀粉酶酶解的条件为:单位酶活100U/g,在80℃下酶解10~30min。
- 根据权利要求2或3所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于:步骤(1)中所述的淀粉的分子量为1.0×10 6~1.0×10 7g/mol;步骤(1)中所述的醚化反应是指在40~50℃反应2~4h;步骤(1)中所述的淀粉和一氯乙酸得摩尔比为1:0.1~0.4。
- 根据权利要求2或3所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于:步骤(2)中所述的羧甲基淀粉的取代度为0.04~0.27。
- 根据权利要求2或3所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于:步骤(2)中所述的酰化反应是指在25~35℃反应12~24h;酰化反应在催化剂存在条件下进行,所述的催化剂为1-乙基-(3-二甲基氨基丙基)碳二亚胺和N-羟基丁二酰亚胺的混合物。
- 根据权利要求7所述的M细胞靶向和pH响应性的淀粉基载体材料的制备方法,其特征在于:步骤(2)中所述的羧甲基淀粉、催化剂、GRGDS短肽的用量满足:以摩尔量计,羧甲基基团:催化剂:GRGDS短肽的比值为1:1:1~4:1:1,其中催化剂中1-乙基-(3-二甲基氨基丙基)碳二亚胺和N-羟基丁二酰亚胺的摩尔比为1:1;步骤(2)中酰化反应体系中羧甲基淀粉的浓度满足每100mL的酰化体系中含有0.5~2g的羧甲基纤维素钠淀粉。
- 根据权利要求1所述的M细胞靶向和pH响应性的淀粉基载体材料在制备口服制剂中的应用。
- 根据权利要求9所述的M细胞靶向和pH响应性的淀粉基载体材料在制备口服制剂中的应用,其特征在于口服制剂中的活性物质为带正电荷免疫 活性物质。
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