B7-H4 (human):Fc (human) (rec.)

Product Description: B7-H4 is a B7 family member that negatively regulates T cell immunity by inhibiting of T cell proliferation, cytokine production, and cell cycle progression. In vitro, B7-H4 inhibits CD4+ and CD8+ T cell proliferation, cytokine production, and generation of alloreactive cytotoxic T-cells (CTLs). In vivo, blockade of endogenous B7-H4 by specific monoclonal antibody promotes T cell responses. B7-H4 ia an important negative regulator of innate immunity through growth inhibition of neutrophils. B7-H4 is expressed on some tumor cancer cells. The role of B7-H4 in tumor progression may be to transform precancerous cells and then protect them from immunosurveillance.

Alternate Names/Synonyms: V-set Domain-containing T Cell Activation Inhibitor 1; VTCN1; B7h.5; Immune Costimulatory Protein B7-H4; T Cell Costimulatory Molecule B7x; Protein B7S1

Product type: Protein

Source / Host: CHO cells

Sequence: The extracellular domain of human B7-H4 (aa 29-258) is fused to the N-terminus of the Fc region of human IgG1.

Species Crossreactivity: Human

Biological Activity: Measured by the ablility to inhibit anti-CD3-induced proliferation of stimulated human T cells. Human T lymphocytes cultured for 72 hours with PHA were incubated for an additional 3 days in 96 well place coated with 500ng/ml anti-CD3 and 10µg/ml human B7H4/Fc. The presence of human B7H4/Fc at 10µg/ml inhibited anti CD3 response by 30-50%. Optimal dilutions should be determined by each laboratory for each application.

TAGs: Fc

Purity: >98% (SDS-PAGE)

Endotoxin: <0.06EU/µg protein (LAL test; Lonza).

Formulation: Lyophilized from 0.2µm-filtered solution in PBS.

Handling Advice: Avoid freeze/thaw cycles.

Short Term Storage: +4°C

Long Term Storage: -20°C

Shipping: BLUE ICE

Use & Stability: 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.

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