商品编号


CHI-HF-210CD28-C200



品牌


Adipogen



公司


Adipogen



公司分类


Cancer



Size

200 ?g

商品信息


More Information



Product Details



Product Type

Protein



Properties



Source/Host

CHO cells



Sequence

The extracellular domain of human CD28 (aa 19-152) is fused to the N-terminus of the Fc region of human IgG1.



Crossreactivity

Human



BIOLOG
ical Activity

Measured by its binding
ABI
lity in a functional
ELISA
. Immobilized CD28 (human):Fc (human) (rec.) (#CHI-HF-210CD28) at 20μg/ml (50μl/well) can bind the protein CD80 (human):Fc (mouse) (rec.) (#CHI-HF-211CD80). The EC
50
is about 0.05μg/ml.



Purity

≥98% (SDS-PAGE)



Endotoxin Content

<0.06eu mu;g="" protein="" (lal="" test;="" lonza).="">0.06eu>



Reconstitution

Reconstitute at 100μg/ml in sterile PBS.



Formulation

Lyophilized from 0.2μm-filtered solution in PBS.



Other Product Data

NCBI reference AAA60581.1: CD28 (human)



Declaration

Manufactured by Chimerigen.



Shipping and Handling



Shipping

BLUE ICE



Short Term Storage

+4°C



Long Term Storage

-20°C



Handling Advice

Avoid freeze/thaw cycles.



Use/St
ABI
lity

Stable for at least 1 year after receipt when stored at -20°C.
Working aliquots are stable for up to 3 months when stored at -20°C.



Documents



MSD
S

No



Product Specification Sheet



Datasheet


Download PDF





CD28 and CTLA-4 together with their ligands, CD80 (B7-1) and CD86 (B7-2), constitute one of the dominant costimulatory pathways that regulate T and B cell responses. CD28 and CTLA-4 are structurally homologous molecules that are members of the immunoglobulin (Ig) gene superfamily. Both CD28 and CTLA-4 are composed of a single Ig V-like extracellular domain, a transmembrane domain and an intracellular domain. CD28 and CTLA-4 are both expressed on the cell surface as disulfide-linked homodimers or as monomers. The genes encoding these two molecules are closely linked on human chromosome 2 and mouse chromosome 1. Mouse CD28 is expressed constitutively on virtually 100% of mouse T cells and on developing thymocytes. Cell surface expression of mouse CD28 is downregulated upon ligation of CD28 in the presence of PMA or PHA. In contrast, CTLA-4 is not expressed constitutively but is upregulated rapidly following T cell activation and CD28 ligation. Cell surface expression of mouse CTLA-4 peaks approx.y 48 hours after activation. Although both CTLA-4 and CD28 can bind to the same ligands, CTLA-4 binds to B7-1 and B7-2 with a 20-100 fold higher affinity than CD28. CD28/B7 interaction has been shown to prevent apoptosis of activated T cells via the upregulation of bcl-XL. CD28 ligation has also been shown to regulate Th1/Th2 differentiation.