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DLL4

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All listed services and products are For Research Use Only. Do Not use in any diagnostic or therapeutic applications.

Background

Delta-like ligand 4 (DLL4), encoded by the DLL4 gene located on chromosome 15q15.1, is a member of the Delta/Serrate/Lag-2 (DSL) family of canonical Notch ligands. The delta gene family encodes Notch ligands that are characterized by a DSL domain, epidermal growth factor (EGF)-like repeats, and a single-pass transmembrane domain. The crystal structure of human DLL4 has revealed that the DSL domain and the N-terminal MNNL (module at the N-terminus of Notch ligands) domain mediate binding to Notch receptors. Specifically, Notch1 EGF-like repeats 11 and 12 interact with the DLL4 DSL domain and MNNL domain, respectively. DLL4 is prominently expressed in arterial endothelial cells during development, and its expression is induced by vascular endothelial growth factor (VEGF). DLL4 has also been detected in immune cell populations including macrophages and dendritic cells.

DLL4 functions as a membrane-bound ligand that activates Notch signaling through direct cell-cell interactions. DLL4 activates downstream Notch signaling primarily through Notch1 and Notch4 receptors, with in vitro binding affinity assays showing that DLL4 has at least a 10-fold higher binding affinity to Notch1 than DLL1. Ligand binding to the extracellular domain of Notch triggers proteolytic activation of the receptor, generating the Notch intracellular domain (NICD), which translocates to the nucleus and induces expression of target genes such as Hes and Hey. Through this signaling mechanism, DLL4 plays an essential role in vascular development—haploinsufficiency of DLL4 is embryonically lethal in mice, underscoring its dosage-sensitive requirement. DLL4 functions as a key regulator of sprouting angiogenesis, where it is highly expressed in endothelial tip cells and acts as a negative regulator of angiogenic sprouting by limiting endothelial cell proliferation and promoting vessel maturation and stabilization. DLL4-Notch signaling also couples sprouting angiogenesis with artery formation. Beyond the vasculature, DLL4-Notch signaling has been reported to promote proinflammatory activation of macrophages. These properties position DLL4 as an important research target for studies of Notch signaling, vascular development, angiogenesis regulation, and immune cell signaling.

Fig. 1 Comparison of Partial sequence comparison of Notch ligands in pattern organisms. (OA Literature) Fig. 1 Partial sequence comparison of Notch ligands.1

DLL4 Protein Function: Roles in Notch Receptor Activation, Angiogenesis Regulation, and Vascular Development

DLL4, encoded by the DLL4 gene, functions as a membrane-bound Notch ligand that activates downstream signaling through receptor binding:

  • Notch Receptor Binding and Activation: DLL4 binds to Notch1 and Notch4 receptors via its DSL and MNNL domains, triggering proteolytic activation of the receptor and generation of the NICD, which translocates to the nucleus to regulate target gene expression.
  • Sprouting Angiogenesis Regulation: DLL4 is highly expressed in endothelial tip cells during sprouting angiogenesis and functions as a negative regulator of angiogenic sprouting, limiting endothelial cell proliferation and promoting vessel maturation.
  • Arterial Specification: DLL4 is specifically expressed in arterial endothelium and plays a critical role in establishing and maintaining arterial identity during vascular development.
  • VEGF-Notch Crosstalk: DLL4 expression is induced by VEGF signaling, and DLL4-Notch signaling in turn shapes VEGF-driven angiogenic responses, representing a key regulatory feedback loop in angiogenesis.
  • Immune Cell Signaling: DLL4-Notch signaling has been reported to promote proinflammatory activation of macrophages, indicating a role beyond vascular biology.

DLL4 Membrane Protein Product

Creative Biolabs offers high-quality DLL4 membrane protein products produced using optimized expression systems. These include full-length type I transmembrane protein that retains the native membrane-spanning domain, as well as isolated extracellular domain variants containing the DSL domain and EGF-like repeats. The extracellular domains mediate Notch receptor binding and activation, making these proteins suitable for studies of Notch ligand-receptor interactions, receptor activation mechanisms, and angiogenesis regulation. All DLL4 proteins undergo strict quality control to support consistent performance across applicable research platforms.

Custom DLL4 Protein Product

Not finding the protein product you need? Contact us to start your one-stop custom service!

DLL4 Stable Cell Line Product

Creative Biolabs provides custom-engineered DLL4 stable cell lines, including overexpression and knockdown models. These cell lines are optimized for studies of Notch signaling pathway activation, angiogenesis regulation, arterial specification, and vascular development research. Each cell line undergoes stringent validation to ensure stable expression profiles and consistent functional performance in diverse experimental contexts.

DLL4 Stable Cell Line Product

Not finding the stable cell line product you need? Contact us to start your one-stop custom service!

DLL4 Recombinant Antibody Product

High-specificity recombinant antibodies targeting DLL4 are developed using antibody engineering technologies for research applications involving DLL4 expression and localization. These antibodies can be used in studies of DLL4 distribution in endothelial cells and other relevant cell populations and may also support characterization of DLL4-Notch receptor interactions in combination with appropriate detection reagents.

DLL4 Recombinant Antibody Product

Not finding the recombinant antibody product you need? Contact us to start your one-stop custom service!

Product Features

  • Native Notch Ligand Structure Preservation: Maintains the characteristic DSL domain and EGF repeat conformation essential for Notch receptor binding and activation studies.
  • Angiogenesis Research Compatibility: Optimized reagent series for studies of sprouting angiogenesis, arterial specification, and VEGF-Notch signaling crosstalk.
  • High Specificity for DLL4: Minimizes non-specific cross-reactivity with other Notch ligands including DLL1, DLL3, JAG1, and JAG2.
  • Comprehensive Customization Support: Facilitates end-to-end development of customized proteins, antibodies and stable cell lines to address Notch signaling and vascular biology research demands.

Custom DLL4 Research Services

Beyond catalog products, Creative Biolabs offers specialized custom services for DLL4 research:

  • Custom DLL4 Protein Production: Tailored expression of mutant and tagged DLL4 constructs for Notch receptor binding and activation studies.
  • Custom Antibody Development: Generation of DLL4-specific antibodies for immunostaining, flow cytometry, and protein detection applications.
  • Stable Cell Line Engineering: Construction of DLL4-modified cell models for Notch signaling, angiogenesis, and vascular development research.
  • Functional Assay Development: Custom design of Notch activation, receptor binding, and angiogenesis-related detection workflows.

Frequently Asked Questions (FAQs)

  1. What is the primary function of DLL4?

    DLL4 is a membrane-bound Notch ligand that activates Notch1 and Notch4 receptors, regulating sprouting angiogenesis, arterial specification, and vascular development through cell-cell contact-dependent signaling.

  2. Why is DLL4 a significant research target?

    DLL4 plays an essential role in vascular development and angiogenesis regulation, functioning as a key negative regulator of sprouting angiogenesis. Its expression is induced by VEGF, and it represents a critical node in the VEGF-Notch signaling crosstalk.

  3. Are Creative Biolabs' DLL4 products suitable for clinical use?

    No, all DLL4 products and services are strictly for research use only, not intended for clinical diagnosis or treatment.

  4. What types of DLL4 products does Creative Biolabs offer?

    Offerings include full-length DLL4 membrane proteins, extracellular domain variants, specific detection antibodies, and custom stable cell lines for Notch signaling and angiogenesis research.

  5. How are DLL4 proteins validated for activity?

    DLL4 proteins are validated via Notch receptor binding assays, Notch activation assays, and relevant functional characterization in applicable research platforms.

Reference
  1. Airich, A., et al. "Neuralized-Like Proteins Differentially Activate Notch Ligands." EMBO Reports, 26.8 (2025): 8. Under Open Access license CC BY 4.0, without modification. https://doi.org/10.1038/s44319-025-00601-7
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