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Exosome sustained release system and construction method and application thereof

A construction method and technology of exosomes, applied in the direction of prostheses, liquid delivery, pharmaceutical formulations, etc., can solve the problems of short retention time, retention time of no more than 24 hours, and increased treatment costs, so as to improve treatment efficiency and long-term release , to solve the effect of short residence time

Active Publication Date: 2019-08-16
上海艾棵颂生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relevant research reports have shown that exosomes injected intravenously into mammals are mainly enriched in the liver and spleen, and are rapidly metabolized, and the residence time in the body does not exceed 24 hours; exosomes injected locally also have a residence time short question
This problem seriously affects the therapeutic efficiency of exosomes
According to current research reports, in order to achieve effective treatment of diseases, exosomes must be injected many times in order to maintain their effective concentration, resulting in an increase in treatment costs.
In view of this, how to realize the long-term residence and release of exosomes at the site of action is a key issue in the realization of exosome therapy, but there is currently no effective way to solve the above problems

Method used

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  • Exosome sustained release system and construction method and application thereof
  • Exosome sustained release system and construction method and application thereof
  • Exosome sustained release system and construction method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Preparation of hyaluronic acid solution loaded with bone marrow mesenchymal stem cell-derived exosomes (BMSC-Exos)

[0083] Extraction of BMSC-Exos: Take 5 bottles of human bone marrow mesenchymal stem cells whose cell growth area is 60%-70% of T75, replace with 15mL serum-free medium and continue to culture for 2 days. These media were collected and divided into ten 50 mL centrifuge tubes. Centrifuge at speeds of 300g, 2,000g, and 10,000g for 20 minutes respectively to remove impurities such as cells, cell debris, and organelles in the culture medium. Then centrifuge at 100,000 for 1 h, and aspirate the supernatant, and keep about 200 μL of the lower liquid in each tube. Exosomes were identified by transmission electron microscopy and immunoblotting of surface proteins.

[0084] Subsequently, 200 μL of exosomes were dispersed in 1 ml of physiological buffer. The concentration of exosomes in the exosome suspension was measured by a nanoparticle analyzer to be 1 × 10 ...

Embodiment 2

[0086] Construction of photocrosslinked hydrogel exosome sustained-release system loaded with induced pluripotent stem cell-derived exosomes (iPS-Exos)

[0087] Culture of human induced pluripotent stem cells (iPSCs) and extraction and identification of exosomes

[0088] A layer of embryonic stem cell Matrigel (ESC-Qualified BD Matrigel, BD Sparks, MD, USA), iPSCs were moved into the dish, and mTeSR1 serum-free medium (StemCell Vancouver, BC, Canada), in an incubator (37°C, 5% CO 2 , saturated humidity) culture, and collect the culture medium changed every day. Filter the medium through a 0.22-micron pore-size filter membrane and centrifuge at 10,000 g at 4°C for 30 minutes to remove cell debris; use an ultrafiltration tube with a number-average molecular weight of 100 KD, centrifuge (3,500 g, 15 min) to intercept exosomes in the concentrated supernatant, and obtain exosomes. Secretion concentrate; transfer the concentrate to a 30% sucrose / heavy water density pad (1.210 g / c...

Embodiment 3

[0093] Construction of hyaluronic acid membrane loaded with embryonic stem cell-derived exosomes (ES-Exos)

[0094] The induced pluripotent stem cell-derived exosomes (iPS-Exos) extracted in Example 2 were dispersed in 1 mL of distilled water, and the concentration of the exosome suspension measured by a nanoparticle analyzer was 1×10 10 / mL. Accurately weigh 0.05 g of hyaluronic acid with a number average molecular weight of 130 KDa and 0.05 g of gelatin, dissolve them in 9 mL of distilled water, and mix them with the iPS-Exos suspension. Then 500 μL of the above solution was evenly spread on the polytetrafluoroethylene base plate, and the base plate was placed in a constant temperature drying oven at 40 °C for 24 hours to obtain a hyaluronic acid-gelatin film loaded with iPS-Exos.

[0095] Further, the same iPS-Exos-loaded carboxymethyl fiber-gelatin film as the above-mentioned film material was prepared according to the same method. Soak the two membranes in 2mL of physio...

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Abstract

The invention relates to an exosome system for achieving sustained release of a CD44 positive exosome based on binding effect of hyaluronic acid and a membrane protein CD44 and a construction method and an application thereof. The CD44 positive exosome effectively binds to materials constructed by hyaluronic acid, so as to realize long-term release of the exosome. The method provided by the invention can effectively solve the problem of short staying time of the exosome in a body and improve the therapeutic efficiency of the exosome.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to an exosome sustained-release system and its construction method and application. Background technique [0002] Exosomes are nanoscale vesicles released outside the cells formed by the fusion of multivesicular inclusion bodies and cell membranes in eukaryotic cells, with a diameter of 30–100 nm. In the human body, almost all cells secrete exosomes; at the same time, exosomes are distributed in various body fluids and blood. Exosomes contain genes, proteins, phospholipids and other substances of the mother cell, which can fuse with the cell membrane of the recipient cell and transfer these substances to the recipient cell, thereby exerting an influence on the recipient cell. In addition, the surface of exosomes inherits part of the membrane proteins of the mother cells and has the ability to recognize specific cells. The content of exosomes from different cell sources and...

Claims

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Application Information

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IPC IPC(8): A61K35/545A61K35/28A61K35/15A61K35/13A61K31/337A61K47/36A61K47/42A61K47/38A61K9/08A61K9/06A61K9/70A61P19/02A61P17/00A61P21/00A61P19/04A61P29/00A61P9/10A61P35/00A61L27/38A61L27/20A61L27/22A61L27/60
CPCA61K35/545A61K35/28A61K35/15A61K35/13A61K31/337A61K47/36A61K47/42A61K47/38A61K9/08A61K9/06A61K9/0019A61K9/7007A61P19/02A61P17/00A61P21/00A61P19/04A61P29/00A61P9/10A61P35/00A61L27/3834A61L27/20A61L27/222A61L27/60A61L2300/412A61K2300/00C08L5/08
Inventor 杨云龙汪泱
Owner 上海艾棵颂生物科技有限公司
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