Polypeptide specifically binding to CD123 protein, polypeptide complex, co-delivery system, preparation method and application thereof
A polypeptide complex and specific technology, applied in the field of biomedicine, can solve problems such as outstanding curative effects that have not yet been observed, and achieve the effects of easy synthesis and modification, inhibition of activity, and inhibition of interaction
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Embodiment 1
[0057] Embodiment 1: polypeptide and its preparation
[0058] The polypeptide targeting CD123 of the present invention is prepared by a standard solid-phase polypeptide synthesis method, and its amino acid sequence is shown in Table 1, all of which are white powders with a purity of ≥98%, preferably numbered 5 in Table 1 # and 6 # The polypeptides with the amino acid sequences shown are PO-6 and PO-6N. In order to verify the effect of the polypeptides of the present invention, the polypeptides shown in Table 1 were prepared into a polypeptide mother solution with a concentration of 1 mM with PBS buffer solution before all experiments.
[0059] The amino acid sequence of table 1 polypeptide of the present invention
[0060] Numbering code name sequence 1 #
[0061] The polypeptides in Table 1 were identified by high performance liquid chromatography and mass spectrometry, and confirmed to be target polypeptides.
Embodiment 2
[0062] Embodiment 2: Polypeptide complex and its preparation
[0063] The preparation method of polypeptide complex comprises the following steps:
[0064] (1) Dissolve 1-50 mg of high molecular polymer and 1 mg of polypeptide in PBS solution, and dissolve by ultrasonic vortexing to obtain solution A; the high molecular polymer is selected from methoxypolyethylene glycol (mPEG)-polycaprolactone (PCL)(mPEG 2000 -PCL 2000 ), distearoylphosphatidylethanolamine (DSPE)-polyethylene glycol 2000 (PEG2000) (DSPE-PEG2000), polyethylene caprolactam-polyvinyl acetate-polyethylene glycol (Soluplus), polyoxyethylene polyoxypropylene One of ether block copolymer (molecular weight ratio of polyoxyethylene and polyoxypropylene is 80:20), polylactic acid-glycolic acid copolymer (PLGA, molecular weight ratio of polylactic acid and glycolic acid is 50:50) or Several, preferably methoxypolyethylene glycol (mPEG)-polycaprolactone (PCL) (mPEG 2000 -PCL 2000 , commercially available), Soluplus ...
Embodiment 3
[0071] Example 3: Co-delivery system and its preparation
[0072] The preparation method of co-delivery system comprises the following steps:
[0073] (1) Dissolving chemotherapeutic drugs (vincristine, doxorubicin hydrochloride, camptothecin, or cyclophosphamide, etc.) Doxorubicin hydrochloride is preferred.
[0074] (2) Mix the chemotherapeutic drug mother solution obtained in step (1) with the above polypeptide complex according to the mass ratio of the chemotherapeutic drug to the polypeptide complex 1: (10-80), mix in a constant temperature water bath at 25-75°C for 20-120min, Solution D is obtained by encapsulating the chemotherapeutic drug in the polypeptide complex.
[0075] (3) Let the solution D stand at room temperature, filter it with a 0.22 μm polyethersulfone water-based filter membrane, remove free drugs, and obtain a co-delivery system formed by polypeptide complexes and chemotherapeutic drugs, with an average hydration particle size of 50-200 nm .
[0076] T...
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