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Temperature and enzyme responsive protein polymer conjugate, and preparation method and application of conjugate

A temperature-responsive and enzyme-responsive technology, which is applied in the direction of peptide/protein components, medical preparations with non-active ingredients, medical preparations containing active ingredients, etc., to achieve high specificity and improve the effect of drug circulation half-life

Active Publication Date: 2019-08-30
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are difficult to further significantly improve the level of drug metabolism

Method used

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  • Temperature and enzyme responsive protein polymer conjugate, and preparation method and application of conjugate
  • Temperature and enzyme responsive protein polymer conjugate, and preparation method and application of conjugate
  • Temperature and enzyme responsive protein polymer conjugate, and preparation method and application of conjugate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Example 1 IFNα-MMPS-ELP fusion protein plasmid construction and expression in Escherichia coli

[0105] The present invention obtains ELPs with different sequences and molecular sizes by designing and optimizing the amino acid sequence of the ELP repeating unit and the number of repetitions of the repeating unit, and determines the ELP with excellent performance through screening (both ensuring that the phase transition temperature is properly lower than body temperature, It is in the form of a gel in the body to achieve aggregation in the body and slow release of protein drugs into the blood, making the drug both long-acting and sustained release with good tissue permeability). In this embodiment, the amino acid sequence of the ELP repeat unit is VGVPG, and the repeat number n is 90, named ELP(V) 90 Taking the excellent performance of ELP as an example, ELP(V) 90 The phase transition temperature is in the range of 20-36 °C.

[0106] Gene fragments containing the abov...

Embodiment 2

[0123] Example 2 Purification of IFNα-MMPS-ELP and IFNα-ELP Fusion Protein

[0124] 1. Use Inverse transition cycling (ITC) to purify IFNα-MMPS-ELP and IFNα-ELP. The specific method is as follows:

[0125] (1) Collect 1L of Escherichia coli culture solution in a centrifuge bottle, collect the cells by centrifugation at 3000×g, and remove the supernatant culture solution.

[0126] (2) The cells were resuspended in 30 mL of ice-cold PBS, and the cells were disrupted by an ultrasonic instrument at 4° C., and then the crushed E. coli products were centrifuged at 4° C. and 14,000×g centrifugal force for 15 minutes.

[0127] (3) Add 2 mL of polyethyleneimine (PEI, 10%) to the supernatant collected in step (2), and centrifuge again for 15 minutes, in order to remove nucleic acid and other negatively charged substances in the cell lysate, and obtain the above ITC purification of the supernatant: add NaCl with a final concentration of 3M, fully dissolve at 37°C and centrifuge at 14,00...

Embodiment 3

[0130] Example 3 Determination of Physicochemical Characterization Parameters of IFNα-MMPS-ELP and IFNα-ELP Fusion Proteins

[0131] 1. Measure the molecular weight of the purified product obtained in Example 2 with matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF), and the instrument used is 4800PlusMALDI-TOF / TOF TM Analyzer (AB SCIEX), the results are as image 3 As shown, the experimentally measured molecular weights of IFNα-MMPS-ELP, IFNα-ELP and IFNα are close to the theoretical values.

[0132] 2. The hydration radius of the sample was determined by the dynamic light scattering (DLS) method on Malvern Zetasizer Nano-zs90: the sample was diluted in PBS buffer and filtered through a 0.22 μm pore size filter before testing. According to the DLS test, the hydration radius of IFNα is 2.9nm, while the hydration radius of the synthesized protein-polymer conjugate reaches 11nm. The kidney filtration clearance size is about 5nm radius, ind...

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Abstract

The invention relates to the technical field of controlled release and target delivery of protein medicines, in particular to a temperature and enzyme responsive protein polymer conjugate, and a preparation method and an application of the conjugate. The temperature and enzyme responsive protein polymer conjugate comprises a protein medicine, and enzyme responsive polypeptide and a temperature responsive polymer that are sequentially coupled with the protein medicine. On the one hand, due to temperature responsivity of the protein polymer conjugate, a half life of the protein medicine is significantly prolonged, pharmacokinetic parameters are improved, and the conjugate has the significant advantages in improving drug metabolism performance; on the other hand, due to enzyme responsivity ofthe conjugate, tissue permeability and activity of the protein medicine are effectively improved after enzyme digestion release; the efficacy of the medicine is improved; toxic and side effects of the medicine are reduced; and the conjugate is applicable to administration of various pharmaceutical protein substances and treatment of diseases and has excellent popularization and application valuesand potentials.

Description

technical field [0001] The invention relates to the technical field of controllable sustained release and targeted delivery of protein drugs, in particular to a temperature- and enzyme-responsive protein polymer conjugate and its preparation method and application. Background technique [0002] Protein-polymer conjugates have become the most commonly used method to effectively prolong the circulating half-life of protein drugs because they can increase the hydration radius of small molecular proteins and thereby escape renal clearance. Currently, the most commonly used method to prolong the circulating half-life of protein drugs is to modify protein drugs with polyethylene glycol (PEG), which is commonly referred to as PEGylation. Modification of IFN with polyethylene glycol (PEG) can effectively improve its pharmacokinetics, improve drug distribution, and improve its curative effect. Alternatively, fusing therapeutic proteins to long-acting circulating proteins such as hum...

Claims

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Application Information

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IPC IPC(8): A61K47/64A61K38/21A61P35/00
CPCA61K38/21A61K38/212A61K38/215A61K38/217A61K47/64A61P35/00
Inventor 高卫平王卓然
Owner PEKING UNIV
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