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A photosensitive nano-liposome targeting triple-negative breast cancer stem cells

A triple-negative breast cancer, nano-liposome technology, applied in the direction of liposome delivery, organic active ingredients, medical preparations of non-active ingredients, etc. Tumor drugs, lack of targeting, etc., to increase the therapeutic effect, solve the toxic and side effects, and achieve the effect of good stability

Inactive Publication Date: 2019-05-03
WUXI MATERNAL & CHILD HEALTH HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TH-302 has certain limitations: ①It is easily inactivated in an oxygen-rich environment, making it difficult to become a stable antitumor drug; ②Due to the lack of targeting, it is easy to induce skin and mucous membrane toxicity and bone marrow suppression
These are the key issues that limit its clinical application

Method used

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  • A photosensitive nano-liposome targeting triple-negative breast cancer stem cells
  • A photosensitive nano-liposome targeting triple-negative breast cancer stem cells
  • A photosensitive nano-liposome targeting triple-negative breast cancer stem cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: The preparation method of the photosensitive nanoliposome targeting triple-negative breast cancer stem cells comprises the following steps:

[0046](1) Measure 80mL of methanol, add 0.065g of EDC and 0.039g of NHS under stirring conditions, then add 0.3mL of oleic acid, and fully stir for 30min to obtain the first mixed solution;

[0047] (2) Weigh 1 g of chitosan oligosaccharide and dissolve it in 100 mL of 1% acetic acid solution to obtain the second mixed solution;

[0048] (3) Add the first mixed solution dropwise to the second mixed solution, stir and react at room temperature for 48 hours to obtain the third mixed solution;

[0049] (4) A small amount of ammoniacal liquor is added to the third mixed solution to separate out the precipitate, centrifuged, the centrifugal speed is 3000rmp, and the centrifugal time is 5min, thoroughly washed with methanol, dialyzed in distilled water for 48h, and the distilled water used for dialysis is replaced every 4h...

Embodiment 2

[0053] Example 2: Characterization of photosensitive nanoliposomes targeting triple-negative breast cancer stem cells

[0054] 1) TEM detection:

[0055] The photosensitive nano-liposome targeting triple-negative breast cancer stem cells was taken, dropped on the copper grid, and observed under TEM after drying.

[0056] 2) Nanoparticle size analysis:

[0057] The photosensitive nano-liposome targeting triple-negative breast cancer stem cells was placed in a cuvette, and the particle size was measured by a nanoparticle analyzer.

[0058] 3) Encapsulation efficiency detection of photosensitive nanoliposomes targeting triple-negative breast cancer stem cells

[0059] UV-visible spectrophotometer was used to measure: ① prepare standard solutions of TH302 and Ce6, and detect the OD values ​​of different concentrations of TH302 and Ce6 at wavelengths of 330nm and 500nm; ② freeze-dry targeted photosensitive nano-lipids and dissolve them in methanol After centrifuging to take the ...

Embodiment 3

[0064] Example 3: In vitro treatment of photosensitive nanoliposomes targeting triple negative breast cancer stem cells

[0065] 1) CCK8 experiment

[0066] ①The cells were divided into culture medium group, simple chemotherapy group (photosensitive liposomes loaded with Ce6 and TH302 without irradiation), simple PDT group (liposomes loaded with Ce6 plus irradiation), targeted PDT group (chitooligosaccharide-modified Ce6-loaded liposomes), targeted chemotherapy group (chitooligosaccharide-modified TH302-loaded liposomes), chemotherapy+PDT group (photosensitive liposomes loaded with Ce6 and TH302 plus irradiation), targeted chemotherapy+PDT group (chitooligosaccharide-loaded liposomes) Sugar-modified Ce6 and TH302 liposomes plus irradiation), set the PDT treatment power to 50mW, 30min; ② After the treatment, centrifuge to discard the supernatant, 10μl CCK8, continue to incubate for 4h, then centrifuge to discard the liquid, and use enzyme-labeled The OD value of the cells was ...

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Abstract

A photosensitive nano-liposome targeting triple-negative breast cancer stem cells is disclosed. The active component of the liposome is a 2-nitroimidazole type prodrug. The liposome includes the active component, lecithin, cholesterol, a target molecule and a photosensitizer, wherein the lecithin and the cholesterol form a nanosphere, the active component and the photosensitizer are covered withinthe nanosphere, and the target molecule is connected to the outside of the nanosphere. The photosensitive nano-liposome has advantages including a uniform particle size, a high encapsulation efficiency and high stability, has a specific targeting treatment function, improves the capability of a medicine to enter cells, and allows the medicine to specifically gather at a tumor position to kill tumor without toxic or side effects on normal tissue. The photosensitive nano-liposome can utilize complementary treatment combining a photodynamic therapy and a hypoxic activation and chemotherapeutic activation, and provides reliable experiment research data and theoretical basis for clinical application and research.

Description

technical field [0001] The invention relates to the technical field of liposomes, in particular to a photosensitive nano-liposome targeting triple-negative breast cancer stem cells. Background technique [0002] Breast cancer is the malignant tumor with the highest morbidity rate in women, and it is on the rise, but its mortality rate is slowly decreasing, and more and more patients survive for a long time under reasonable treatment. However, breast cancer is a highly heterogeneous disease. Triple-negative breast cancer, which accounts for about 20%, has a high incidence in various subregions due to its malignant biological behaviors such as high invasion, easy recurrence, and metastasis, as well as the lack of effective therapeutic targets. The prognosis is the worst in the type, which greatly affects the overall prognosis of breast cancer. Therefore, finding suitable targets for the treatment of triple-negative breast cancer and exploring new methods for the treatment of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K9/127A61K47/24A61K47/28A61K41/00A61K31/675A61P35/00
Inventor 杨蕊唐秋莎陈萱陈钰丁一楠周洁程凯许涵洁
Owner WUXI MATERNAL & CHILD HEALTH HOSPITAL
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