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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.