Sufficiently diverse amphiphilic MHC II binding polypeptide, immunocarrier microsphere and preparation method and application thereof
A technology that combines peptides and amphiphilic properties. It is used in medical preparations without active ingredients, medical preparations containing active ingredients, peptides, etc. It can solve problems such as protein leakage, difficulty in realizing clinical therapeutic value, etc., and achieve specificity. Good results
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Embodiment 1
[0069] Example 1 Design and Preparation of MHCII-binding Polypeptide Self-Assembly Amphipathic Polypeptide Used in Mouse Animal Experiments
[0070] 1. MHCII-binding peptides for Balb / C mice, tetanus exotoxin fragments were selected according to the literature:
[0071] TT830-844 QYIKANSKFIGITELD
[0072] 2. For the MHCII-binding peptides of C57 / BL6 mice, egg ovalbumin fragments were selected according to the literature:
[0073] OVA 324-338 ISQAVHAAHAEINEA
[0074] 3. For the construction of immune carrier microspheres, the design and synthesis of amphipathic polypeptides containing the above two MHCII-binding polypeptides can be synthesized by conventional methods:
[0075] (1) Pal-AAAAGGG-C-QYIKANSKFIGITELD-RDKQKK-mal (Pal: palmitoyl, mal: maleimide).
[0076] (2) Pal-AAAAGGGG-C-ISQAVHAAHAEINEA-QKDRDK-mal
Embodiment 2
[0077] The preparation of microspheres in embodiment 2 organic solvent / water solvent mixed solvent
[0078] 1. The principle of peptide self-assembly into balls:
[0079] Such as figure 1 As shown, the amphiphilic polypeptide belongs to the polymer surfactant, and at the water / oil two-phase interface, the hydrophobic end is immersed in the oil phase, and the hydrophilic end is free in the water phase. If the oil phase is in the shape of microspheres, the amphiphilic polypeptide can be used as the mold of the oil phase microspheres, and beta-parallel aggregated and distributed across the interface of the microspheres. Due to the existence of two kinds of β-sheet peptides, when the solvent in the oil phase evaporates under stirring conditions, the amphiphilic polypeptide is insoluble in water and becomes a stable self-assembled microsphere in the water phase.
[0080] 2. Preparation operation
[0081] (1) 10 mg of the synthesized amphipathic MHCII-binding polypeptide is disso...
Embodiment 3
[0087] Example 3 Preparation of solid lipids as template polypeptide self-assembled microspheres
[0088] 1. The principle of ball formation: first dissolve palmitic acid in an organic solvent, emulsify into microspheres as a template. The amphiphilic polypeptide solution is poured into it and mixed with it, and under stirring condition, the hydrophobic end of the amphiphilic polypeptide is buried in the organic phase containing palmitic acid to be anchored, and the hydrophilic end is in the water phase. After the organic solvent volatilizes to form solid particles, it forms microspheres with stable dispersion. Particle size can be controlled by ultrasonic or homogenizer. The proviso is that the solvent in which the amphipathic polypeptide is dissolved is immiscible with the organic phase in which the palmitic acid is dissolved.
[0089] The invention uses acetonitrile / water to dissolve the amphipathic polypeptide, and palmitic acid is dissolved by petroleum ether or cyclohe...
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