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Compositions and methods for modulating stem cells and uses thereof

a technology of stem cells and compositions, applied in the field of compositions and methods for modulating stem cells, can solve the problems of long-term corticosteroid use, inability to achieve long-term corticosteroid use, etc., to achieve symmetric stem cell division, increase cell survival, and promote stem cell division. symmetrical

Inactive Publication Date: 2012-08-23
OTTAWA HOSPITAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0033]In some embodiments, the composition may comprise one or more stem cell modulators, such as, a modulator that increases the rate of stem cell division or stem cell survival.
[0045]In some embodiments, the method may comprise contacting stem cells with an inhibitor of canonical Wnt / β-catenin signaling in the stem cell. Such inhibition may further promote symmetrical stem cell division.
[0046]In some embodiments, the method may comprise contacting the stem cell with one or more stem cell modulators, for example a modulator that increases the rate of stem cell division or increases cell survival.
[0076]In another aspect there is provided, a method for preventing satellite stem cell depletion comprising contacting the stem cell with (a) a Wnt7a polypeptide or an active variant, fragment, analogue or derivative thereof capable of binding to and activating Fzd7, or (b) a polynucleotide encoding a Wnt7a polypeptide or an active variant, fragment, analogue or derivative thereof capable of binding to and activating Fzd7.

Problems solved by technology

The process of muscle regeneration involves considerable remodeling of extracellular matrix and, where extensive damage occurs, is incomplete.
While corticosteroids can be effective in delaying progression of the disease in many patients, long-term corticosteroid use is undesirable due to unwanted side effects.
The myostatin-blocking approach presents concerns however.
For instance, blocking myostatin could interfere with the satellite cells that help replace injured or dead muscle cells.
In addition, it has been proposed that myostatin blockers may be too targeted to boost muscle growth, as there are a variety of proteins similar to myostatin that also limit muscle growth
A limitation to many potential therapeutic applications has been obtaining a sufficient number of undifferentiated stem cells, and stimulating terminal differentiation into mature tissue-specific cells without depleting the stem cell reservoir.

Method used

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  • Compositions and methods for modulating stem cells and uses thereof
  • Compositions and methods for modulating stem cells and uses thereof
  • Compositions and methods for modulating stem cells and uses thereof

Examples

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example 1

Frizzled7 is Highly Expressed in Quiescent Satellite Stem Cells

[0359]Satellite cells are a heterogeneous population composed of stem cells and committed progenitors. All satellite cells express Pax7 and markers such as CXCR4, however, the present inventors identified a subset of about 10% of Pax7+ cells that have never expressed Myf5 during their developmental history (FIG. 4A). This subset of Pax7+ / Myf5− satellite was identified as a stem cell population within the satellite cell niche (Kuang et al., 2007). Towards performing gene expression analysis of quiescent satellite stem cells, the inventors first developed an improved methodology for satellite cell isolation by fluorescence activated cell sorting (FACS), as described in the Methods section. FACS-purified cells (CD34+, α7-Integrin+, CD31−, CD45−, CD11b−, Sca1−) (FIG. 11A), were >95% satellite cells as determined by Pax7 and Syndecan4 expression (FIG. 11B), and exhibited robust growth and differentiation potential in vitro (F...

example 2

Wnt Expression During Muscle Regeneration

[0363]The present inventors hypothesized that Wnt7a was a candidate ligand for Fzd7 receptor. Coexpression of Fzd7 and Wnt7a during embryonic myogenesis had been reported (Cossu and Borello, 1999) and Wnt7a had been implicated as a regulator of embryonic and adult myogenesis (Chen et al., 2005; Polesskaya et al., 2003; Tajbakhsh et al., 1998). Real-Time PCR-Array analysis of freeze-injured TA muscle was employed to document Wnt expression during regenerative myogenesis. Freeze injury of muscle was chosen because of the significantly reduced inflammatory response relative to other methods such as cardiotoxin (CTX) injection. Changes in gene expression were analyzed at 3 days post-injury, during the acute phase of regeneration, where most of the Pax7+ cells are proliferating, and at 6 days post-injury, when satellite cells have returned to a quiescent sub-laminar position (FIG. 5A).

[0364]At 3 days post-injury significant increases (as compared ...

example 3

Symmetry of Satellite Stem Cell Divisions is Regulated by Wnt7a-Frizzled7

[0369]The expression of Fzd7 in quiescent satellite stem cells and the marked upregulation in Wnt7a during muscle regeneration suggested that Wnt7a-Fzd7 signaling is involved in regulating muscle stem cell function. In addition, Wnt7a had no effect on the growth or differentiation of cultured primary myoblasts in vitro (FIG. 16). Therefore, to investigate the role of Wnt7a-Fzd7 signaling in satellite cells, the ability of recombinant Wnt7a to alter the ratio between asymmetric and symmetric cell divisions of satellite stem cells was examined in vitro. Myofibers were isolated from Myf5-Cre / ROSA26-YFP EDL muscle and cultured under non-adherent conditions. In the culture system, quiescent satellite cells become activated immediately following myofiber isolation. Satellite cells leave their niche, migrate across the basal lamina, and undergo their first cell division in a synchronous fashion. Thus, the outcome of t...

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Abstract

There are provided compositions and methods for modulating stem cell division decisions, in particular, division symmetry. It has been demonstrated that wnt7a acts through frizzled-7 receptor expressed on the surface of adult stem cells, e.g. satellite stem cells, to activate the planar cell polarity (PCP) pathway, thereby promoting symmetrical expansion of stem cells. The compositions and methods of the invention are useful, for example, in modulating stem cell division symmetry in vitro and in vivo, in replenishing and expanding the stem cell pool, and in promoting the formation, maintenance, repair and regeneration of tissue.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a U.S. national phase application of PCT / CA2010 / 000601, filed Apr. 27, 2010, which claims the benefit of priority of U.S. Provisional Patent Application No. 61 / 172,832, filed Apr. 27, 2009, each of which is incorporated herein by reference in its entirety.STATEMENT REGARDING SEQUENCE LISTING[0002]The Sequence Listing associated with this application is provided in text format in lieu of a paper copy, and is hereby incorporated by reference into the specification. The name of the text file containing the Sequence Listing is FATE—100—01US_ST25.txt. The text file is 61 KB, was created on Mar. 20, 2012, and is being submitted electronically via EFS-Web.FIELD OF THE INVENTION[0003]The present invention relates generally to compositions and methods for modulating stem cells, in particular, stem cell division symmetry, and uses thereof.BACKGROUND OF THE INVENTION[0004]Stem cells are undifferentiated, or immature, cells that a...

Claims

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Application Information

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IPC IPC(8): A61K38/18C12N5/02A61K35/12A61P21/00
CPCA61K38/1709A61K48/005C07K14/4702C12N5/0623G01N33/5073C12N15/113C12N2310/14C12N2501/415C12N2800/107C12N15/111A61K38/18A61P21/00A61P21/04A61P21/06A61P43/00A61K35/34A61K35/545C07H21/04C12N5/0658C12N5/0659
Inventor RUDNICKI, MICHAEL A.LE GRAND, FABIEN
Owner OTTAWA HOSPITAL RES INST
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