DLL4 Protein

DLL4 Protein
Symbol	DLL4
Full Name	DLL4
Type	Protein
UniProt	Search UniProt
Associated Diseases	Als, Amyotrophic Lateral Sclerosis, Autoimmune, Cancer, Carcinoma
KG Connections	58 edges

DLL4 (Delta-like protein 4) is a transmembrane ligand for Notch receptors belonging to the Delta/Serrate/Lag-2 (DSL) family. It plays critical roles in vascular development, neural progenitor cell fate determination, and synaptic plasticity. DLL4-Notch signaling is a key pathway in neurovascular unit function and has been increasingly implicated in neurodegenerative processes including Alzheimer’s disease, stroke, and traumatic brain injury.

Overview

DLL4 is a type I transmembrane protein that functions as a potent regulator of Notch receptor signaling. While best characterized for its essential role in developmental and pathological angiogenesis, emerging research has revealed important functions in the central nervous system. In the brain, DLL4 is expressed primarily in endothelial cells lining cerebral vasculature, where it regulates neurovascular coupling and blood-brain barrier (BBB) integrity. Additionally, DLL4-Notch signaling influences neural stem cell proliferation, differentiation, and survival in both embryonic and adult neurogenic niches. ^{1Notch-1 signalling is activated in brain arteriovenous malformations in humans (2010)2010 · PMID 19812212Open reference}

The DLL4-Notch axis has become a focal point in neurodegeneration research due to its dual roles in vascular health and neural progenitor cell regulation. In Alzheimer’s disease, alterations in DLL4 expression contribute to neurovascular dysfunction, impaired amyloid clearance, and dysregulated adult neurogenesis. Therapeutic modulation of DLL4-Notch signaling represents an active area of investigation for neuroprotective strategies, though careful consideration of the pathway’s context-dependent effects is essential. ^{2Loss of CCM3 impairs DLL4-Notch signalling: implication in endothelial angiogenesis and in cerebral cavernous malformations (2013)2013 · PMID 23388056Open reference}

Structure

DLL4 is a 685 amino acid protein containing: ^{3DLL4 regulates cerebrovascular development and endothelial integrity via Notch-CLDN5 pathway (2024)2024 · PMID 38632887Open reference}

• N-terminal DSL domain for Notch receptor binding

• Multiple epidermal growth factor-like (EGF) repeats (8 total)

• C-terminal transmembrane domain

• Intracellular tail involved in signal transduction

• Notch-binding affinity: DLL4 > DLL1 > JAG1 > JAG2

Normal Function in the Nervous System

DLL4-Notch signaling regulates: ^{4The Vascular Notch Ligands Delta-Like Ligand 4 (DLL4) and Jagged1 have opposing correlations with microvascularization in primary glioblastoma (2015)2015 · PMID 26546995Open reference}

• Neural progenitor cell proliferation and differentiation

• Angiogenesis in the brain (neurovascular coupling)

• Synapse formation and plasticity

• Astrocyte and oligodendrocyte development

• Adult hippocampal neurogenesis

Role in Neurodegeneration

Alzheimer’s Disease

• DLL4 expression altered in AD brain vasculature

• Impaired Notch-DLL4 signaling affects amyloid clearance

• Dysregulated neurogenesis in the subventricular zone

• DLL4 modulates inflammatory responses in microglia

• Crosstalk with amyloid-beta and tau pathology

Stroke and Vascular Dementia

• DLL4 critical for post-stroke angiogenesis

• Therapeutic potential for ischemic stroke recovery

• Neurovascular unit protection via DLL4 modulation

Multiple Sclerosis

• DLL4-Notch affects oligodendrocyte precursor cell differentiation

• Demyelination involves altered DLL4 signaling

• Therapeutic targeting in development

Brain Injury

• DLL4 modulates neural stem cell response to injury

• Promotes angiogenesis in traumatic brain injury models

Therapeutic Targeting

DLL4 Modulators

• DLL4-neutralizing antibodies: In clinical trials for cancer (effects on CNS being explored)

• Notch inhibitors: Broader targeting of DLL4-Notch axis

• Soluble DLL4: Experimental approaches for neuroprotection

Research Directions

• DLL4 for stroke recovery and neurogenesis

• Modulating DLL4-Notch for amyloid clearance

• DLL4 in traumatic brain injury treatment

See Also

• DLL4 Gene

• Notch Signaling Pathway

• Blood-Brain Barrier

• Neurovascular Unit

• Angiogenesis in Neurodegeneration

• Alzheimer’s Disease

External Links

• NCBI Gene: DLL4

• UniProt: DLL4 (Q9NRF0)

• Ensembl: ENSG00000128917

• OMIM: 609967