Редактирование: DLL4

Delta-like protein 4 precursor (Drosophila Delta homolog 4) (Delta4) [UNQ1895/PRO4341]

==Publications==

{{medline-entry
|title=Dynamic regulation of [[NOTCH1]] activation and Notch ligand expression in human thymus development.
|pubmed-url=https://pubmed.ncbi.nlm.nih.gov/30042180
|abstract=T-cell development is a complex dynamic process that relies on ordered stromal signals delivered to thymus-seeding progenitors that migrate throughout different thymus microenvironments (TMEs). Particularly, Notch signaling provided by thymic epithelial cells (TECs) is crucial for T-cell fate specification and generation of mature T cells. Four canonical Notch ligands (Dll1, Dll4, Jag1 and Jag2) are expressed in the thymus, but their spatial distribution in functional TMEs is largely unknown, especially in humans, and their impact on Notch1 activation during T-lymphopoiesis remains undefined. Based on immunohistochemistry and quantitative confocal microscopy of fetal, postnatal and adult human and mouse thymus samples, we show that spatial regulation of Notch ligand expression defines discrete Notch signaling niches and dynamic species-specific TMEs. We further show that Notch ligand expression, particularly [[DLL4]], is tightly regulated in cortical TECs during human thymus ontogeny and involution. Also, we provide the first evidence that [[NOTCH1]] activation is induced [i]in vivo[/i] in [[CD34]]  progenitors and developing thymocytes at particular cortical niches of the human fetal and postnatal thymus. Collectively, our results show that human thymopoiesis involves complex spatiotemporal regulation of Notch ligand expression, which ensures the coordinated delivery of niche-specific [[NOTCH1]] signals required for dynamic T-cell development.
|mesh-terms=* Adolescent
* Adult
* Aging
* Animals
* Antigens, CD34
* Child
* Fetus
* Gene Expression Regulation, Developmental
* Humans
* Infant
* Infant, Newborn
* Ligands
* Mice
* Mice, Inbred C57BL
* Organogenesis
* Receptor, Notch1
* Serrate-Jagged Proteins
* Signal Transduction
* Stem Cells
* Stromal Cells
* Thymocytes
* Thymus Gland
|keywords=* Human
* Notch ligands
* Thymus microenvironment
* γδ T cells
|full-text-url=https://sci-hub.do/10.1242/dev.165597
}}