Simple Western lane view shows lysates of HUVEC human umbilical vein endothelial cells, loaded at 0.2 mg/mL. A specific band was detected for EphB4 at approximately 127 kDa (as indicated) using 50 µg/mL of Goat ...read more
EphB4 was detected in immersion fixed paraffin-embedded sections of human kidney using 15 µg/mL Goat Anti-Human EphB4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF3038) overnight at 4 °C. Tissue was ...read more
Genetic Strategies: Western blot shows lysates of HEK293T human embryonic kidney parental cell line and EphB4 knockout HEK293T cell line (KO). PVDF membrane was probed with 2 µg/mL of Goat Anti-Human ...read more
Western blot shows lysates of K562 human chronic myelogenous leukemia cell line, COLO 205 human colorectal adenocarcinoma cell line, ZR‑75 human breast cancer cell line, and HUVEC human umbilical vein ...read more
MCF‑7 human breast cancer cell line was stained with Goat Anti-Human EphB4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF3038, filled histogram) or isotype control antibody (Catalog # AB-108-C, ...read more
Mouse myeloma cell line NS0-derived recombinant human EphB4 Leu16-Ala539 Accession # P54760
Detects human EphB4 in direct ELISAs and Western blots. In direct ELISAs, less than 10% cross-reactivity with recombinant mouse (rm) EphB4 is observed and less than 1% cross-reactivity with recombinant human (rh) EphA4, rhEphA3, rhEphB2, and rhEphB3 is observed.
Details of Functionality
ActivityAssaywCitation not found None None None None None
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Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
12 months from date of receipt, -20 to -70 °C as supplied.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
6 months, -20 to -70 °C under sterile conditions after reconstitution.
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
Reconstitute at 0.2 mg/mL in sterile PBS.
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for EphB4 Antibody [Unconjugated]
EPH receptor B4
ephrin type-B receptor 4
hepatoma transmembrane kinase
HTKephrin receptor EphB4
soluble EPHB4 variant 1
soluble EPHB4 variant 2
soluble EPHB4 variant 3
Tyrosine-protein kinase receptor HTK
Tyrosine-protein kinase TYRO11
EphB4, also known as Htk, Myk1, Tyro11, and Mdk2, is a member of the Eph receptor tyrosine kinase family and binds Ephrin-B2. The A and B class Eph proteins have a common structural organization (1-4). The human EphB4 cDNA encodes a 987 amino acid (aa) precursor that includes a 15 aa signal sequence, a 524 aa extracellular domain (ECD), a 21 aa transmembrane segment, and a 427 aa cytoplasmic domain (5). The ECD contains an N-terminal globular domain, a cysteine-rich domain, and two fibronectin type III domains. The cytoplasmic domain contains a juxtamembrane motif with two tyrosine residues which are the major autophosphorylation sites, a kinase domain, and a conserved sterile alpha motif (SAM) (5). Activation of kinase activity occurs after membrane-bound or clustered ligand recognition and binding. The ECD of human EphB4 shares 89% aa sequence identity with mouse EphB4 and 42-45% aa sequence identity with human EphB1, 2, and 3. EphB4 is expressed preferentially on venous endothelial cells (EC) and inhibits cell-cell adhesion, chemotaxis, and angiogenesis. Opposing effects are induced by signaling through Ephrin-B2 expressed on arterial EC: adhesion, endothelial cell migration, and vessel sprouting (6). EphB4 singaling contributes to new vascularization by guiding venous EC away from Ephrin-B2 expressing EC. Ephrin-B2 signaling induces arterial EC to migrate towards nascent EphB4 expressing vessels (6). The combination of forward signaling through EphB4 and reverse signaling through Ephrin-B2 promotes in vivo mammary tumor growth and tumor-associated angiogenesis (7). EphB4 promotes the differentiation of megakaryocytic and erythroid progenitors but not granulocytic or monocytic progenitors (8, 9).
Poliakov, A. et al. (2004) Dev. Cell 7:465.
Surawska, H. et al. (2004) Cytokine Growth Factor Rev. 15:419.
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PRODUCT AVAILABILITY: Update Regarding the Evolving COVID-19 Situation
Bio-Techne appreciates the critical role that you and our products and services play in research efforts to further scientific innovation and discovery. We are continually assessing our manufacturing and supplier capabilities during the COVID-19 situation and are implementing precautionary measures to ensure uninterrupted supply of products and services. Currently, and as we abide by local shelter in place orders across the world, we are fully operational and do not anticipate any material supply disruptions across our Bio-Techne brands and product lines. As the situation evolves, our goal is to utilize preventive measures to reduce the threat that COVID-19 poses to our ability to meet the needs of our customers globally.