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Spermine-modified pullulan as an immunopotentiator

A technology of pullulan polysaccharide and spermine, which is applied in the field of pullulan polysaccharide, can solve the problem that the application of immune enhancer has not yet been reported publicly, and achieves the effect of good application prospect.

Active Publication Date: 2020-09-18
THE INST OF BASIC MEDICAL SCI OF CHINESE ACAD OF MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PS has been studied and reported as a gene delivery carrier, but its application as an immune enhancer has not been publicly reported

Method used

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  • Spermine-modified pullulan as an immunopotentiator
  • Spermine-modified pullulan as an immunopotentiator
  • Spermine-modified pullulan as an immunopotentiator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Refining of pullulan

[0026] PS can be synthesized from commercially obtained pullulan or its further refined products. A typical refining process is briefly described as follows: commercial pullulan (purchased from Tokyo Chemical Industry, with an average molecular weight of about 100,000) is heated and hydrolyzed in an acid solution, and is refined by fractional precipitation by gradually adding ethanol to the hydrolyzed product, thereby A series of pullulan with different molecular weights was obtained. The typical hydrolysis reaction conditions are: hydrolysis in 0.6mol / L sulfuric acid solution at 80°C for 90 minutes, at this time the average molecular weight of the pullulan hydrolyzate is about 50,000. Pullulan with one or more molecular weights (typical molecular weight between 5,000-100,000, especially around 50,000) can be selected for further synthesis of PS.

Embodiment 2

[0027] Embodiment 2: the preparation method of PS

[0028] Coupling agents can be used, such as N,N'-carbonyldiimidazole (N,N'-Carbonyldiimidazole, CDI), N,N'-disuccinimidyl carbonate (N,N'-Disuccinimidyl carbonate, DSC) , Sodium periodate, galactose oxidase enzymes, reactive alkyl halogen compounds, isocyanates, etc., directly or indirectly couple spermine molecules to the hydroxyl groups of pullulan; or open C-C bonds through oxidants such as sodium periodate to form aldehydes Active functional groups such as radicals, so as to further directly or indirectly couple spermine molecules to the carbon skeleton of pullulan.

[0029] Typical reaction conditions are as follows: 3.74 g of spermine and 450 mg of CDI were added to 100 mL of dimethyl sulfoxide (DMSO) containing 100 mg of pullulan, stirred at 35 °C for 20 h, and then the mixture was dialyzed for 2 days, the dialysis molecular weight cut-off was 8-14kD. Freeze-drying is performed after dialysis to obtain PS powder. The...

Embodiment 3

[0030] Embodiment 3: CCK8 method detects the impact of PS on mouse macrophage activity

[0031] The mouse macrophage RAW 264.7 was used for the experiment, and the RAW 264.7 cells were planted in a 96-well plate according to 20,000 cells per well. After the cells adhered to the wall and grew well, different concentrations of PS (1, 2.5, 5, 7.5 , 10 μg / mL) were incubated with the cells for 24 hours. After washing twice with PBS, add CCK8 detection reagent (100 μL medium + 10 μL CCK8), put the culture plate in the incubator for 2 hours, absorb the supernatant, detect the absorbance at 450 / 630 nm, and organize the data.

[0032] The result is as figure 1 As shown, there was no significant difference in cell viability compared with the untreated control group, indicating that PS concentrations less than 10 μg / mL did not affect cell viability.

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Abstract

The invention relates to spermine-modified pullulan as an immunopotentiator. Specifically, a spermine molecule is coupled to a hydroxyl group or a C framework of the pullulan in the spermine-modifiedpullulan; the intake yield of the spermine molecule is 1%-90%, especially 10%-30%. In another aspect, a composition containing the spermine-modified pullulan and a purpose of the composition are provided.

Description

technical field [0001] The invention relates to a spermine-modified pullulan, in particular to its application in the preparation of a tumor immune enhancer (also known as an immune booster or an immune stimulator). Background technique [0002] Surgical resection, chemical drug therapy (chemotherapy) and radiation therapy (radiotherapy) and other traditional tumor treatment methods mainly kill tumor cells, while tumor immunotherapy induces the body to produce specific cellular immunity against tumor antigens through the effect on immune cells. response to achieve the goal of eradicating tumors. Since most tumor cells lack specific tumor antigens, and the function of immune cells is usually severely inhibited in the tumor microenvironment, the use of various tumor-associated antigens (cells, cell fragments, proteins secreted by cells, etc.) Stimulation therapy plays an important role. [0003] Substances that can stimulate immune cells include bacterial endotoxin (LPS), Cp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K31/715A61K31/739A61K39/39A61K39/00A61K47/54A61P37/04A61P35/00
CPCA61K31/715A61K31/739A61K39/0011A61K39/39A61K47/543A61K2039/55583A61P35/00A61P37/04A61K2300/00
Inventor 刘健许海燕谢丽菲孟洁
Owner THE INST OF BASIC MEDICAL SCI OF CHINESE ACAD OF MEDICAL SCI
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