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重組人血管生成素-2(rHuANG-2)

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CYT-414重組人血管生成素-2(rHuANG-2) 2μg/10μg/1mg Prospec

 

 

Background:
 The angiopoietin (Ang) family of growth factors includes four members, all of which bind to the endothelial receptor tyrosine kinase Tie2. Two of the Angs, Ang-1 and Ang-4, activate the Tie2 receptor, whereas Ang-2 and Ang-3 inhibit Ang-1-induced Tie2 phosphorylation. Angiopoietin-1 (Ang-1) is a secreted growth factor which binds to and activates the Tie-2 receptor tyrosine kinase. The factor enhances endothelial cell survival and capillary morphogenesis, and also limits capillary permeability. Ang-2 binds the same receptor but fails to activate it: hence, it is a natural inhibitor of Ang-1. Ang-2 destabilises capillary integrity, facilitating sprouting when ambient vascular endothelial growth factor (VEGF) levels are high, but causing vessel regression when VEGF levels are low.
Tie -1 is a Tie -2 homologue but its ligands are unknown. Angiopoietin and Tie genes are expressed in the mammalian metanephros, the precursor of the adult kidney, where they may play a role in endothelial precursor growth.

 
Description:
 Human Angiopoitin-2 (Ang-2), a 66 kDa protein consisting of 476 amino acid residues (21-496), is fused to a N-terminal myc-tag and produced in insect cells.


 
Physical Appearance:
 Sterile Filtered white lyophilized freeze dry powder.

 
Formulation:
 The protein is formulated with no additives.

 
Solubility:
 It is recommended to reconstitute the lyophilized Recombinant Human ANG-2 in sterile 18MΩ-cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.

 
Stability:
 
 Lyophilized Recombinant Human Angiopoietin-2 although stable at room temperature for 3 weeks, should be stored desiccated below -180C. Upon reconstitution Recombinant Ang-2 should be stored at 40C between 2-7 days and for future use below -180C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).
Please avoid freeze-thaw cycles.

 
Purity:
 Greater than 95.0% as determined by:
(a) Analysis by RP-HPLC.
(b) Anion-exchange FPLC.
(c) Analysis by reducing and non-reducing SDS-PAGE Silver Stained gel.

 
Biological Activity:
 The biological activity was determined by the induction of endothelial cell sprouting as described in Korff et al., 2001.

 
Endotoxin:
 Less than 0.1 ng/µg (IEU/µg) of rHuANG-2.

 
Protein content:
 Protein quantitation was carried out by two independent methods:

1. UV spectroscopy at 280 nm using the absorbency value of 1.4 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (InliGenetics).
2. Analysis by RP-HPLC, using a standard solution of ANG-1 as a Reference Standard.

 
Usage:
 Prospec's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.


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