Human Angiopoietin-2 Antibody Summary
Accession # O15123
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Detection of Human Angiopoietin‑2 by Western Blot. Western blot shows lysates of HUVEC human umbilical vein endothelial cells, HepG2 human hepatocellular carcinoma cell line, human placenta tissue, human ovary tissue, and human uterus tissue. PVDF membrane was probed with 0.5 µg/mL of Mouse Anti-Human Angiopoietin-2 Monoclonal Antibody (Catalog # MAB0983) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF018). A specific band was detected for Angiopoietin-2 at approximately 70 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.
Preparation and Storage
- 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.
Angiopoietin-2 (Ang-2; also ANGPT2) is a secreted glycoprotein that plays a complex role in angiogenesis and inflammation (1, 2). Mature Ang-2 is 478 amino acids (aa) in length. It contains one coiled-coil domain (aa 166 - 248) that mediates multimerization, and a C-terminal fibrinogen-like domain (aa 275 - 495) that mediates receptor binding. Under reducing conditions, secreted monomeric Ang-2 is 65 - 66 kDa in size. Under nonreducing conditions, both natural and recombinant Ang-2 form 140 kDa dimers, 200 kDa trimers, and 250 - 300 kDa tetramers and pentamers (3 - 6). Alternate splicing generates a short isoform that lacks 52 amino acids preceding the coiled-coil domain (4). Mature human Ang-2 shares 86% aa sequence identity with mouse and rat Ang-2. Ang-2 is widely expressed during development, but it is restricted postnatally to highly angiogenic tissues such as the placenta, ovaries, and uterus (3). It is particularly abundant in vascular endothelial cells (EC) where it is stored in intracellular Weibel-Palade bodies (1, 3, 7). Both Ang-2 and the related Angiopoietin-1 (Ang-1) are ligands for the receptor tyrosine kinase Tie-2 (2). While Ang‑1 is a potent Tie-2 agonist, Ang-2 may act as either a Tie-2 antagonist or agonist, depending upon its state of multimerization. The higher the order of oligomer, the more effective Ang‑2 becomes as a Tie-2 agonist (3, 8 - 11). The short isoform appears to block the binding of either Ang-1 or full-length Ang-2 to Tie-2 (4). Ang-2 functions as a pro-angiogenic factor, although it can also induce EC death and vessel regression (12, 13). Upon its release from quiescent EC, it regulates vascular remodeling by promoting EC survival, proliferation, and migration and destabilizing the interaction between EC and perivascular cells (8, 13, 14). Ang-2 is required for postnatal vascular remodeling, and it cooperates with Ang-1 during lymphatic vessel development (7, 15). It mediates the upregulation of ICAM-1 and VCAM-1 on EC, which facilitates the adhesion of leukocytes during inflammation (16). Ang-2 is upregulated in both the endothelium and tumor cells of several cancers as well as in ischemic tissue (17 - 20). Its direct interaction with Integrins promotes tumor cell invasion (21, 22). Ang-2 also promotes the neuronal differentiation and migration of subventricular zone progenitor cells (20).
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Citations for Human Angiopoietin-2 Antibody
R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.
Citations: Showing 1 - 5
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Endothelial pyruvate kinase M2 maintains vascular integrity
Authors: B Kim, C Jang, H Dharaneesw, J Li, M Bhide, S Yang, K Li, Z Arany
J. Clin. Invest., 2018;0(0):.
Shear stress-regulated miR-27b controls pericyte recruitment by repressing SEMA6A and SEMA6D
Authors: S Demolli, A Doddaballa, K Devraj, K Stark, Y Manavski, A Eckart, CM Zehendner, T Lucas, T Korff, M Hecker, S Massberg, S Liebner, D Kaluza, RA Boon, S Dimmeler
Cardiovasc. Res., 2017;113(6):681-691.
Sample Types: Cell Lysates
Applications: Western Blot
Regulation of angiopoietin expression by bacterial lipopolysaccharide.
Authors: Mofarrahi M, Nouh T, Qureshi S, Guillot L, Mayaki D, Hussain SN
Am. J. Physiol. Lung Cell Mol. Physiol., 2008;294(5):L955-63.
Sample Types: Tissue Homogenates
Applications: Western Blot
Developmental differences in the responses of IL-6 and IL-13 transgenic mice exposed to hyperoxia.
Authors: Choo-Wing R, Nedrelow JH, Homer RJ, Elias JA, Bhandari V
Am. J. Physiol. Lung Cell Mol. Physiol., 2007;293(1):L142-50.
Sample Types: Whole Tissue
Differential expression of angiopoietin-1, angiopoietin-2, and Tie receptors in placentas from pregnancies complicated by placenta accreta.
Authors: Tseng JJ, Hsu SL, Ho ES, Hsieh YT, Wen MC, Chou MM
Am. J. Obstet. Gynecol., 2006;194(2):564-71.
Sample Types: Whole Tissue
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