Description
Recombinant Human DLL4 Protein (His Tag)(Active) | PKSH031805 | Gentaur US, UK & Europe Disrtribition
Synonyms: Delta-like protein 4; Drosophila Delta homolog 4; Delta4; DLL4
Active Protein: Active protein
Activity: A DNA sequence encoding the extracellular domain (Met 1-Pro 524) of human DLL4 (NP_061947.1) pro-protein was expressed; with a polyhistidine tag at the C-terminus.
Protein Construction: A DNA sequence encoding the extracellular domain (Met 1-Pro 524) of human DLL4 (NP_061947.1) pro-protein was expressed; with a polyhistidine tag at the C-terminus.
Fusion Tag: C-His
Species: Human
Expressed Host: HEK293 Cells
Shipping: This product is provided as lyophilized powder which is shipped with ice packs.
Purity: > 98 % as determined by reducing SDS-PAGE.
Endotoxin: < 1.0 EU per µg as determined by the LAL method.
Stability and Storage: Generally, lyophilized proteins are stable for up to 12 months when stored at -20 to -80℃. Reconstituted protein solution can be stored at 4-8℃ for 2-7 days. Aliquots of reconstituted samples are stable at < -20℃ for 3 months.
Molecular Mass: 55.7 kDa
Formulation: Lyophilized from sterile PBS, pH 7.4
Reconstitution: Please refer to the printed manual for detailed information.
Background: Delta-like protein 4 (DLL4; Delta4); a type I membrane-bound Notch ligand; is one of five known Notch ligands in mammals and interacts predominantly with Notch 1; which has a key role in vascular development. Recent studies yield substantial insights into the role of DLL4 in angiogenesis. DLL4 is induced by vascular endothelial growth factor (VEGF) and acts downstream of VEGF as a 'brake' on VEGF-induced vessel growth; forming an autoregulatory negative feedback loop inactivating VEGF. DLL4 is downstream of VEGF signaling and its activation triggers a negative feedback that restrains the effects of VEGF. Attenuation of DLL4/Notch signaling results in chaotic vascular network with excessive branching and sprouting. DLL4 is widely distributed in tissues other than vessels including many malignancies. Furthermore; the molecule is internalized on binding its receptor and often transported to the nucleus. In pathological conditions; such as cancer; DLL4 is up-regulated strongly in the tumour vasculature. Blockade of DLL4-mediated Notch signaling strikingly increases nonproductive angiogenesis; but significantly inhibits tumor growth in preclinical mouse models. In preclinical studies; blocking of DLL4/Notch signaling is associated with a paradoxical increase in tumor vessel density; yet causes marked growth inhibition due to functionally defective vasculature. Thus; DLL4 blockade holds promise as an additional strategy for angiogenesis-based cancer therapy.
Research Area: Cell biology, Neuroscience, epigenetics and nuclear signal
