VEGF-A (Isoform 121) Human Protein

Specifications

Product Data
Species	Human
Expression Host	E. coli
Predicted MW	28.4 kDa
Purity	>98% pure by SDS-PAGE and Silver staining.
Buffer	Presentation State: Purified State: Lyophilized without buffer and stabilizer. Buffer System: 50 mM Acetic Acid.
Preparation	Lyophilized without buffer and stabilizer.
Protein Description	Human VEGF is a 28.4 kDa protein consisting of two 121 amino acid polypeptide chains.
Note	Centrifuge vials before opening!
Storage	Store lyophilized protein at -20°C. Reconstituted VEGF121 should be stored in working aliquots at -20°C. Avoid repeated freeze-thaw cycles!
Stability	Shelf life: One year from despatch.
Bioactivity	Biological: The ED50 for stimulation of 3H-thymidine incorporation and cell proliferation by human umbilical vein endothelial cells for VEGF121 has been determined to be in the range of 1-4 ng/ml.
Endotoxin	< 0.1 ng per µg of VEGF121.
Reference Data
RefSeq	NP_001020537
Locus ID	7422
UniProt ID	P15692
Cytogenetics	6p21.1
Synonyms	VEGFA, VEGF, VPF, Vascular endothelial growth factor A, Vascular permeability factor
Summary	This gene is a member of the PDGF/VEGF growth factor family. It encodes a heparin-binding protein, which exists as a disulfide-linked homodimer. This growth factor induces proliferation and migration of vascular endothelial cells, and is essential for both physiological and pathological angiogenesis. Disruption of this gene in mice resulted in abnormal embryonic blood vessel formation. This gene is upregulated in many known tumors and its expression is correlated with tumor stage and progression. Elevated levels of this protein are found in patients with POEMS syndrome, also known as Crow-Fukase syndrome. Allelic variants of this gene have been associated with microvascular complications of diabetes 1 (MVCD1) and atherosclerosis. Alternatively spliced transcript variants encoding different isoforms have been described. There is also evidence for alternative translation initiation from upstream non-AUG (CUG) codons resulting in additional isoforms. A recent study showed that a C-terminally extended isoform is produced by use of an alternative in-frame translation termination codon via a stop codon readthrough mechanism, and that this isoform is antiangiogenic. Expression of some isoforms derived from the AUG start codon is regulated by a small upstream open reading frame, which is located within an internal ribosome entry site. The levels of VEGF are increased during infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), thus promoting inflammation by facilitating recruitment of inflammatory cells, and by increasing the level of angiopoietin II (Ang II), one of two products of the SARS-CoV-2 binding target, angiotensin-converting enzyme 2 (ACE2). In turn, Ang II facilitates the elevation of VEGF, thus forming a vicious cycle in the release of inflammatory cytokines. [provided by RefSeq, Jun 2020]
Protein Families	Druggable Genome, Secreted Protein
Protein Pathways	Bladder cancer, Cytokine-cytokine receptor interaction, Focal adhesion, mTOR signaling pathway, Pancreatic cancer, Pathways in cancer, Renal cell carcinoma, VEGF signaling pathway

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