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Liposome delivery system for treating cartilage diseases and preparation method of liposome delivery system

A delivery system, liposome technology, applied in the field of medicine, can solve the problem that liposomes cannot be targeted into cartilage tissue

Active Publication Date: 2015-11-25
魏垒 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bone-targeted delivery system prepared by this patent is intramuscular or intravenous injection of liposomes, and then liposomes bring liposomes into bone tissue through targeting molecules, thereby acting on bone tissue, but the bone-targeted delivery system Inability to target liposomes into cartilage tissue

Method used

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  • Liposome delivery system for treating cartilage diseases and preparation method of liposome delivery system
  • Liposome delivery system for treating cartilage diseases and preparation method of liposome delivery system
  • Liposome delivery system for treating cartilage diseases and preparation method of liposome delivery system

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: A liposome delivery system for the treatment of cartilage diseases, including liposomes, liposome modifications and small nucleic acid drugs, the liposomes are phosphatidylcholine DPPC, cholesterol, Dlin-KC2 -DMA; the liposome modification is polyethylene glycol lipid conjugate (C16PEG2000Ceramide) C-PEG, and the small nucleic acid drug is IhhsiRNA; its target sequence is SEQ ID NO: 2, which is the 1708-1734th part of IhhsiRNA Base sequence; the phosphatidylcholine DPPC concentration is 35mg / ml, accounting for 11.72% of the mass percent of liposomes and liposome modifications; the cholesterol concentration is 9.5mg / ml, accounting for liposomes and lipids The mass percentage of body modification is 23.85%; The concentration of polyethylene glycol lipid conjugate C-PEG is 50mg / ml, accounting for 16.74% of the mass percentage of liposome and liposome modification; Dlin-KC2-DMA The concentration is 28.5mg / ml, accounting for 47.69% of the mass percentage of lip...

experiment example 1

[0034] Experimental example 1: Verification of liposome delivery system into chondrocytes

[0035] 1. Liposome delivery of siRNA into chicken hypertrophic chondrocytes

[0036] Experimental materials: 1 / 3 chondrocytes of 17-day chicken embryo sternum, lipid nanoparticle (LNP), negative control siRNA (NegativeControlsiRNA). 0.3% EDTA-free trypsin, 0.9% collagenase, 0.3% hyaluronidase [Type I, Sigma, Cat. No. H3506-1G].

[0037] Experimental method: The LNP-siRNA complex was prepared as described in Example 1. Obtain chondrocytes from 1 / 3 of the sternum of 15 17-day-old chicken embryos, cut them into pieces, put them in a 50ml centrifuge tube, and then add 1ml of each of the three digestive solutions, 3ml in total (digestive solution preparation: 0.3% EDTA-free pancreatic Protease, 0.9% collagenase, 0.3% hyaluronidase (prepared by volume 1:1:1), placed in a 37°C water bath for 30 minutes, carefully sucked up the upper liquid, and then added 1ml each of the three digestive solu...

experiment example 2

[0046] Experimental Example 2: Verification of the expression of IhhmRNA in rats after the prepared LNP-siRNA complex was systematically treated:

[0047] Experimental materials: 10 Wistar rats. Lipid nanoparticle (LNP), Ihh.siRNA solution: take 10ul of Ihh.siRNA with a concentration of 20uM, dilute it to 40ul for use.

[0048] Experimental method: The LNP-Ihh.siRNA complex was prepared as described in Example 1. 40ul of the LNP-Ihh.siRNA complex was injected into the right knee joint of the rat, and 40ul of the Ihh.siRNA solution was injected into the left knee joint. After 48 hours, the rats were sacrificed, the whole knee articular cartilage of the rats was scraped, and the total RNA was extracted, reverse-transcribed into cDNA, and detected by Real-time PCR.

[0049] Ihh mRNA primer: sense strand: 5'- CAGGAAGGACCCATTCCGTC- 3' ;antisense strand: 5'- AAGTCACAAACCCAGGTCCC- 3' .

[0050] The results showed that the expression of IhhmRNA decreased by 80% in the rat right k...

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Abstract

The invention belongs to the technical field of medicine; in order to solve the problem that no efficient and safe cartilage siRNA delivery system is provided for limiting application of RNAi in treating cartilage diseases, the invention provides a cartilage siRNA liposome delivery system and a preparation method of the delivery system. The delivery system consists of lipidosome, a lipidosome modifier and a small nucleic acid drug, wherein the lipidosome is phosphatidylcholine, cholesterol or Dlin-KC2-DMA; the lipidosome modifier is a polyethylene glycol lipid conjugate; and the small nucleic acid drug is Ihh siRNA. According to the invention, a liposome nano based cartilage RNA interference delivery system is modified, and the formed composite has positive charges, is safe and small in volume, and can be distributed in a full-lamellar cartilage tissue. Carrier experiments verify that siRNA can be delivered into cartilage cells to successful knock out corresponding genes inside the cartilage cells, therefore a bottleneck of gene knockout in the cartilage tissue is broken through; and the siRNA, as a target gene, can be used for treating PTOA (post-traumatic osteoarthritis).

Description

technical field [0001] The invention belongs to the technical field of medicine, and in particular relates to a liposome delivery system for treating cartilage diseases and a preparation method thereof. Background technique [0002] Indian Hedgehog (Ihh) is associated with Post-traumatic osteoarthritis (PTOA), and the expression of Ihh is increased in the early stage of knee anterior cruciate ligament (ACL) injury, and ACL injury will eventually develop into PTOA. In animal experiments, the use of conditional gene knockout mice to knock out the Ihh gene in the articular cartilage of adult mice can slow down ACL injury and reduce the occurrence of PTOA. Therefore, knocking out the Ihh gene can be used as a targeted gene to treat PTOA. However, the current Ihh gene knockout technology cannot be used to treat PTOA in animals other than transgenic mice and humans, and chemical Ihh inhibitors can cause serious side effects, including: holoprosencephaly, cleft lip and palate, li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K9/127A61K48/00A61K31/713A61P19/04
Inventor 魏垒卫小春王少伟张戈孙晓娟
Owner 魏垒
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