Related Experiment Video
Updated: Jun 18, 2026

08:56
Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
Published on: June 9, 2015
Transient beta-catenin stabilization modifies lineage output from human thymic CD34+CD1a- progenitors
Jaris Valencia1, Carmen Hernández-López, Víctor G Martínez
1Department of Cell Biology, Complutense University, Madrid, Spain.
Journal of Leukocyte Biology
|December 3, 2009
Summary
Stimulating the Wnt signaling pathway in human thymic progenitors enhances natural killer (NK) cell production. This Wnt pathway activation also reduces the generation of myeloid lineage cells, including monocytes and dendritic cells (DCs).
Area of Science:
- Immunology
- Developmental Biology
- Stem Cell Biology
Background:
- Wnt proteins are key signaling pathways regulating immune and non-immune differentiation.
- Wnt signaling influences hematopoietic stem cell and thymic progenitor proliferation, cell-fate decisions, and maturation.
- The precise role of Wnt signaling in the thymus remains under investigation.
Purpose of the Study:
- To investigate the impact of transient canonical Wnt pathway stimulation on the differentiation potential of human thymic progenitors.
- To analyze how Wnt3a or LiCl exposure affects the development of various immune cell lineages from these progenitors.
Main Methods:
- Transient stimulation of the canonical Wnt pathway in Lin(-)CD34(+)CD1a(-) human thymic progenitors using Wnt3a or LiCl.
- Analysis of changes in cell differentiation capacity, including T cells, NK cells, monocytes, conventional dendritic cells (cDCs), and plasmacytoid dendritic cells (pDCs).
- Assessment of cell surface receptor expression (e.g., Flt3L) and transcription factor profiles (e.g., Hes-1, ID3).
Main Results:
- Canonical Wnt pathway stimulation significantly enhances NK cell production from thymic progenitors.
- Wnt3a or LiCl pretreatment reduces the generation of myeloid lineage cells, monocytes, and cDCs.
- A decreased capacity for differentiation into pDCs was observed following Wnt pathway stimulation.
- Wnt stimulation altered progenitor membrane receptor levels for cytokines like Flt3L and modified transcription factor expression (Hes-1, ID3).
Conclusions:
- Transient canonical Wnt pathway activation reshapes the differentiation potential of human thymic progenitors.
- Wnt signaling promotes NK cell development while concurrently inhibiting myeloid and certain dendritic cell lineages.
- Modulation of cytokine receptor expression and transcription factor profiles likely mediates these observed differentiation changes.
Related Concept Videos
Lineage Commitment
Commitment is the process whereby stem cells:
Catenins
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Forced Transdifferentiation
Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial transdifferentiation occurs...
Artificial transdifferentiation occurs...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...

