Thrombospondin-4 Antibody (276523) [Alexa Fluor® 647]

• Reactivity: Hu
• Applications: WB
• Clone: 276523
• Clonality: Monoclonal
• Host: Mouse
• Conjugate: Alexa Fluor 647

Thrombospondin-4 Antibody (276523) [Alexa Fluor® 647] Summary

• Immunogen: Mouse myeloma cell line NS0-derived recombinant human Thrombospondin-4
  Ala22-Asn961 (Pro276Ala, Ala420Val)
  Accession # P35443
• Specificity: Detects human Thrombospondin-4 in direct ELISAs and Western blots. Does not cross-react with recombinant human Thrombospondin-1, -2, or -3.
• Isotype: IgG2b
• Clonality: Monoclonal
• Host: Mouse
• Purity Statement: Protein A or G purified

Applications/Dilutions

• Dilutions:
  • Western Blot

Packaging, Storage & Formulations

• Storage: Protect from light. Do not freeze. 12 months from date of receipt, 2 to 8 °C as supplied
• Buffer: Supplied 0.2mg/ml in 1X PBS with RDF1 and 0.09% Sodium Azide

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Thrombospondin-4 Antibody (276523) [Alexa Fluor® 647]

• THBS4
• thrombospondin 4
• Thrombospondin4
• Thrombospondin-4
• TSP4
• TSP-4

Background

Thrombospondin-4 (TSP-4) is a 140 kDa calcium-binding protein that interacts with other extracellular matrix molecules and modulates the activity of various cell types. TSP‑1 and -2 constitute subgroup A and form disulfide-linked homotrimers, whereas TSP-3, -4, and -5/COMP constitute subgroup B and form pentamers (1, 2). The human TSP-4 cDNA encodes a 961 amino acid (aa) precursor that includes a 26 aa signal sequence followed by an N-terminal heparin-binding domain, a coiled-coil motif, four EGF-like repeats, seven TSP type-3 repeats (one with an RGD motif), and a TSP C-terminal domain (3). Human TSP-4 shares 93% aa sequence identity with mouse and rat TSP-4. Within the TSP type-3 repeats and the TSP C-terminal domain, human TSP-4 shares 79% aa sequence identity with TSP-3 and COMP, and 58% aa sequence identity with TSP-1 and -2. The coiled-coil motif mediates pentamer formation with COMP, either homotypically or heterotypically (3-6). TSP-4 binds a variety of matrix proteins including collagens I, II, III, V, laminin-1, fibronectin, and matrilin-2 (4). Interactions of TSP-4 with non-collagenous proteins are independent of divalent cations, while interactions with collagenous proteins are enhanced in the presence of zinc (4). TSP-4 is expressed in heart, skeletal muscle, vascular smooth muscle, and vascular endothelial cells (7-9). It accumulates at neuromuscular junctions and synapse-rich regions and is upregulated in muscle by experimental denervation (8). TSP-4 mediates the adhesion of motor and sensory neurons and promotes neurite outgrowth (8). A polymorphism of TSP-4 (A387P) is associated with early coronary artery disease (10-12). Unlike wild type TSP-4, the A387P variant does not support HUVEC attachment and spreading (9). Integrin alpha M/ beta 2 enables activated neutrophil adhesion to both the variant A387P and wild type TSP-4, although the A387P variant induces a greater release of proinflammatory molecules (13).

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.