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Method for inducing endodermal and mesodermal differentiation from human pluripotent stem cells by cxcr2 suppression

Active Publication Date: 2017-02-16
KOREA UNIV RES & BUSINESS FOUND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text describes a method that improves the efficiency of using stem cells as a therapeutic agent. This method involves inhibiting a specific protein called CXCR2, which helps to direct the growth of stem cells into specific types of cells. By doing so, researchers have been able to increase the likelihood of stem cells becoming the target cells needed for treatment. This method can therefore make stem cells a more effective tool for regenerative medicine.

Problems solved by technology

Thus, the problem to be solved to use stem cells in actual applications is the development of a technology capable of inducing the differentiation of stem cells into desired cells.
However, conventional methods have disadvantages in that these methods are expensive due to the use of expensive reagents such as cytokines and show low differentiation rates.
This is because a technique that acts on a signaling protein or enzyme is highly likely influenced by other intracellular factors that influence signaling or enzymatic activity, compared to a technique that acts on a cell receptor, and because an operation for controlling the degree of differentiation can be relatively difficult.
However, controlling the differentiation of human pluripotent stem cell-derived embryoid bodies by use of a cell receptor is not yet known.

Method used

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  • Method for inducing endodermal and mesodermal differentiation from human pluripotent stem cells by cxcr2 suppression
  • Method for inducing endodermal and mesodermal differentiation from human pluripotent stem cells by cxcr2 suppression
  • Method for inducing endodermal and mesodermal differentiation from human pluripotent stem cells by cxcr2 suppression

Examples

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example 1

Inhibition of CXCR2 Gene Expression in Human Pluripotent Stem Cells

[0041]Human pluripotent stem cells are able to differentiate into all types of human cells, but a significant portion about the induction of lineage-specific differentiation is still required to be developed. The present inventors have found that the cell membrane receptor CXCR2 plays an important role in the induction of lineage-specific differentiation of human pluripotent stem cells. Furthermore, the present inventors could induce selective differentiation by controlling the receptor CXCR2.

[0042]In this Example, in order to inhibit CXCR2 gene expression to thereby induce differentiation into endoderm and mesoderm, RNA interference that is a genetic manipulation technique was used to inhibit protein synthesis and gene function. In this technique, when a short hairpin RNA (shRNA) is introduced into cells using a vector, it binds to an mRNA having a sequence complementary to a portion of a target gene and cleaves the...

example 2

Inhibition of CXCR2 Gene Expression and Examination of Differentiation Capability

[0044]After inhibition of CXCR2 gene expression, the expression of human pluripotent stem cell marker genes (OCT4, SOX2, and SSEA-4) was analyzed by immunofluorescence staining and real-time quantitative PCR.

[0045]Specifically, cells were fixed with 4% formaldehyde solution for 10 minutes, permeabilized with 0.1% Triton X-100, and blocked with 0.3% serum solution. Then, the cells were incubated overnight with a 1:1000-2000 dilution of primary antibody (Cell Signaling Technology, Inc., USA) for stem cell marker genes (OCT4, SOX2 and SSEA-4) at 4° C. On the next day, the primary antibody was washed out with 1×PBS solution, after which the cells were incubated with fluorescent dye-conjugated secondary antibody at room temperature for 2 hours, and then mounted on a cover glass and observed using a fluorescence microscope (Olympus).

[0046]In addition, using a Qiagen RNeasy kit (Qiagen Hilden, Germany), RNAs w...

example 3

Analysis of Proliferation of Human Pluripotent Stem Cells

[0049]After inhibition of CXCR2 gene expression in human pluripotent stem cells, the proliferation of the cells was analyzed. Specifically, human pluripotent stem cells were seeded in a 96-well plate at a density of 1×104 cells / well, and then analyzed from 48 hours to 144 hours. 10 μl of CCK-8 (Dojindo Laboratories; Kumamoto, Japan) solution was added to the cells at the predetermined time points (48, 72, 96, 120 and 144 hrs), and then incubated for 3 hours, and the absorbance at 450 nm was measured.

[0050]As a result, it could be seen that the proliferation of the human pluripotent stem cells in which CXCR2 gene expression was inhibited was significantly reduced compared to that of the control group (FIG. 1C).

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Abstract

The present invention relates to a method of inducing the differentiation of human pluripotent stem cells into endoderm and mesoderm by CXCR2 inhibition, and more particularly, to a method of promoting the differentiation of human pluripotent stem cells into endoderm and mesoderm by inhibiting the expression of the surface receptor CXCR2 in the stem cells by use of an shRNA technique. The method of inducing the differentiation of human pluripotent stem cells into endoderm or mesoderm by CXCR2 inhibition according to the present invention can increase the efficiency and utility of stem cells as a cell therapeutic agent, because it promotes the differentiation of stem cells into a specific germ layer serving as the origin of target cells, which is the first important step for inducing the differentiation of stem cells into specific cells.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The priority of Korean Patent Application No. 10-2015-0113834 filed Aug. 12, 2015 is hereby claimed under the provisions of 35 USC 119. The disclosure of Korean Patent Application no. 10-2015-0113834 is hereby incorporated herein by reference, in its entirety, for all purposes.TECHNICAL FIELD[0002]The present invention relates to a method of inducing the differentiation of human pluripotent stem cells into endoderm and mesoderm by CXCR2 inhibition, and more particularly, to a method of promoting the differentiation of human pluripotent stem cells into endoderm and mesoderm by inhibiting the expression of the surface receptor CXCR2 in the stem cells by use of an shRNA technique.BACKGROUND ART[0003]Stem cells refer to cells having not only self-replicating ability but also the ability to differentiate into at least two types of cells, and can be divided into totipotent stem cells, pluripotent stem cells, and multipotent stem cells. In recent...

Claims

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Application Information

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IPC IPC(8): C12N5/073
CPCC12N5/0605C12N2501/2308C12N2506/03C12N5/0606C12N5/0696C12N2501/998C12N2506/02C12N2506/45
Inventor KIM, BYUNG SOOJUNG, JI-HYEPARK, YONG
Owner KOREA UNIV RES & BUSINESS FOUND
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